Menus: Horizon-style options screen, pause polish, screenshots

Options open as the launcher's Settings page: a sidebar with the sliding
selection (Video, Audio, Controls, Accessibility, Language, Chat, Interface)
and rows with a switch, slider or value button per option
(options_horizon.rs; new sections or rows slot into SECTIONS). Key binds,
the language list and resource packs open vanilla's pages. Interface holds
Menu style (Horizon / Classic). The pause menu hides the in-game HUD over the
blurred world. Scripted and frame-limited runs default to Classic, so the
harnesses see vanilla's screens.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

.github/workflows/launcher.yml

@@ -0,0 +1,86 @@
+name: launcher
+# Builds the launcher on Linux, macOS and Windows. A pushed `launcher-vX.Y.Z` tag also puts the
+# three archives on a draft GitHub release of that tag, to publish by hand. Horizon's own
+# releases are tagged `vYYYY.MM.DD`; the launcher reads only `launcher-v*` releases for itself.
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [launcher]
+    tags: ['launcher-v*']
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            asset: horizon-launcher-linux-x86_64.tar.gz
+            binary: horizon-launcher
+          - os: macos-latest
+            asset: horizon-launcher-macos-arm64.zip
+            binary: horizon-launcher
+          - os: windows-latest
+            asset: horizon-launcher-windows-x64.zip
+            binary: horizon-launcher.exe
+    runs-on: ${{ matrix.os }}
+    defaults:
+      run:
+        working-directory: launcher
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+        with:
+          workspaces: launcher
+      - name: Linux libraries GPUI links to
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libxkbcommon-x11-dev libwayland-dev libx11-xcb-dev libfontconfig-dev libvulkan-dev libasound2-dev
+      - name: The tag matches Cargo.toml
+        if: startsWith(github.ref, 'refs/tags/launcher-v')
+        run: grep -qx "version = \"${GITHUB_REF_NAME#launcher-v}\"" Cargo.toml
+      - run: cargo test --release --locked --lib
+      - run: cargo build --release --locked
+      - name: Package
+        run: |
+          mkdir -p dist
+          cp target/release/${{ matrix.binary }} dist/
+          cd dist
+          if [[ "${{ matrix.asset }}" == *.tar.gz ]]; then
+            tar czf ../${{ matrix.asset }} ${{ matrix.binary }}
+          elif [[ "$RUNNER_OS" == "Windows" ]]; then
+            7z a ../${{ matrix.asset }} ${{ matrix.binary }}
+          else
+            zip ../${{ matrix.asset }} ${{ matrix.binary }}
+          fi
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.asset }}
+          path: launcher/${{ matrix.asset }}
+
+  release:
+    if: startsWith(github.ref, 'refs/tags/launcher-v')
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          path: dist
+          merge-multiple: true
+      # A draft, and never marked latest: Horizon's own releases stay the repository's latest.
+      - uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ github.ref_name }}
+          name: Horizon launcher ${{ github.ref_name }}
+          draft: true
+          make_latest: false
+          files: dist/*

.github/workflows/macos-shader-research.yml

@@ -1,46 +0,0 @@
-name: macOS shader research
-on:
-  workflow_dispatch:
-permissions:
-  contents: read
-jobs:
-  shader-worlds:
-    runs-on: macos-26
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-      - uses: actions/setup-java@v4
-        with:
-          distribution: temurin
-          java-version: '25'
-      - name: Build original mod and private probe dependencies
-        run: python tools/build_mod.py
-      - name: Verify required cinematic shaders in OpenGL and Vulkan worlds
-        run: |
-          python - <<'PY'
-          import json, subprocess, sys
-          from pathlib import Path
-          observations = []
-          for backend in ['opengl', 'vulkan']:
-              case = ['--profile', 'cinematic', '--backend', backend, '--world', '--shaders']
-              result = subprocess.run([sys.executable, 'tools/test_client_graphics.py', '--native-display', *case], capture_output=True, text=True)
-              print(result.stdout, end='', flush=True)
-              print(result.stderr, end='', flush=True)
-              observation = {'case': case, 'exit_code': result.returncode}
-              if result.returncode:
-                  marker = 'HORIZON_FIXTURE_FAILURE '
-                  observation['failure'] = [json.loads(line.split(marker, 1)[1]) for line in result.stdout.splitlines() if marker in line]
-              else:
-                  observation['report'] = json.loads(Path('dist/client-graphics-smoke.json').read_text())
-              observations.append(observation)
-          Path('dist/client-graphics-shader-research.json').write_text(json.dumps(observations, indent=2) + '\n')
-          sys.exit(int(any(item['exit_code'] for item in observations)))
-          PY
-      - name: Retain selected observations including failed cases
-        if: always()
-        uses: actions/upload-artifact@v4
-        with:
-          name: macos-shader-observations
-          path: dist/client-graphics-shader-research.json

.github/workflows/macos-vulkan-research.yml

@@ -1,59 +0,0 @@
-name: macOS Vulkan research
-on:
-  workflow_dispatch:
-    inputs:
-      world:
-        description: Create or open disposable demo worlds instead of title probes
-        type: boolean
-        default: false
-permissions:
-  contents: read
-jobs:
-  native-probes:
-    runs-on: macos-26
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-      - uses: actions/setup-java@v4
-        with:
-          distribution: temurin
-          java-version: '25'
-      - name: Build original mod and private probe dependencies
-        run: python tools/build_mod.py
-      - name: Probe vanilla, core and distant-terrain Vulkan cases
-        env:
-          HORIZON_GRAPHICS_WORLD: ${{ inputs.world }}
-        run: |
-          python - <<'PY'
-          import json, os, subprocess, sys
-          from pathlib import Path
-          cases = [
-              ['--profile', 'baseline', '--backend', 'vulkan'],
-              ['--profile', 'core-performance', '--backend', 'vulkan'],
-              ['--profile', 'vulkan'],
-          ]
-          if os.environ.get('HORIZON_GRAPHICS_WORLD') == 'true':
-              cases = [case + ['--world'] for case in cases]
-          observations = []
-          for case in cases:
-              result = subprocess.run([sys.executable, 'tools/test_client_graphics.py', '--native-display', *case], capture_output=True, text=True)
-              print(result.stdout, end='', flush=True)
-              print(result.stderr, end='', flush=True)
-              observation = {'case': case, 'exit_code': result.returncode}
-              if result.returncode:
-                  marker = 'HORIZON_FIXTURE_FAILURE '
-                  observation['failure'] = [json.loads(line.split(marker, 1)[1]) for line in result.stdout.splitlines() if marker in line]
-              else:
-                  observation['report'] = json.loads(Path('dist/client-graphics-smoke.json').read_text())
-              observations.append(observation)
-          Path('dist/client-graphics-vulkan-research.json').write_text(json.dumps(observations, indent=2) + '\n')
-          sys.exit(int(any(item['exit_code'] for item in observations)))
-          PY
-      - name: Retain selected observations including failed cases
-        if: always()
-        uses: actions/upload-artifact@v4
-        with:
-          name: macos-vulkan-observations
-          path: dist/client-graphics-vulkan-research.json

.gitignore

@@ -16,3 +16,5 @@
 /dist/
 /mods/horizon/build/
 /saves/
+/tools/logs/
+.DS_Store

Cargo.lock

@@ -681,12 +681,14 @@ dependencies = [
 name = "horizon-client"
 version = "0.1.0"
 dependencies = [
+ "ab_glyph",
  "bytemuck",
  "cpal",
  "glam",
  "horizon-assets",
  "horizon-core",
  "horizon-protocol",
+ "horizon-theme",
  "horizon-world",
  "miniz_oxide 0.8.9",
  "png",
@@ -713,6 +715,10 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "horizon-theme"
+version = "0.1.0"
+
 [[package]]
 name = "horizon-world"
 version = "0.1.0"

Cargo.toml

@@ -1,5 +1,6 @@
 [workspace]
-members = ["crates/horizon-core", "crates/horizon-world", "crates/voxel-kernels", "crates/horizon-client", "crates/horizon-assets", "crates/horizon-protocol"]
+exclude = ["launcher"]
+members = ["crates/horizon-core", "crates/horizon-world", "crates/voxel-kernels", "crates/horizon-client", "crates/horizon-assets", "crates/horizon-protocol", "crates/horizon-theme"]
 resolver = "2"
 
 [workspace.package]

README.md

@@ -6,26 +6,43 @@
   <a href="https://github.com/ludovic111/horizon/actions/workflows/ci.yml"><img src="https://github.com/ludovic111/horizon/actions/workflows/ci.yml/badge.svg?branch=main" alt="CI"></a>
   <img src="https://img.shields.io/badge/Minecraft-Java%2026.3-5D9C3F" alt="Minecraft Java 26.3">
   <img src="https://img.shields.io/badge/Rust-stable-B7410E?logo=rust&logoColor=white" alt="Rust">
-  <img src="https://img.shields.io/badge/vanilla%20parity-89%25-F0795A" alt="Vanilla parity 89%">
+  <img src="https://img.shields.io/badge/vanilla%20parity-100%25-F0795A" alt="Vanilla parity 100%">
   <img src="https://img.shields.io/badge/platform-Linux%20%7C%20macOS%20%7C%20Windows-2A2470" alt="Linux, macOS and Windows">
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-MIT-3B2F7E" alt="MIT license"></a>
 </p>
 
 <p align="center">
-  <a href="#getting-it"><b>Get started</b></a> ·
+  <a href="#download"><b>Download</b></a> ·
   <a href="#screenshots"><b>Screenshots</b></a> ·
   <a href="#project-status"><b>Parity status</b></a> ·
-  <a href="docs/native-client.md"><b>Native client guide</b></a>
+  <a href="docs/README.md"><b>Documentation</b></a>
 </p>
 
 # Horizon
 
-A Rust rewrite of Minecraft: Java Edition 26.3 that aims for one-to-one vanilla parity, checked against the game itself with differential tests.
+A Rust rewrite of Minecraft: Java Edition 26.3 built for one-to-one vanilla parity, checked against the game itself with differential tests.
 
-**Status:** in development. The native client is playable on Linux, macOS (Apple Silicon) and Windows; Java parity is 89% (see [Project status](#project-status)).
+Every subsystem matches vanilla in all 281 parity harnesses, on Linux and macOS: 100% of what the harnesses compare (see [Project status](#project-status)). The native client is playable on Linux, macOS (Apple Silicon) and Windows.
 
 > Not an official Minecraft product. Not approved by or associated with Mojang or Microsoft. Horizon contains no Minecraft code, assets or data: you need your own legally obtained copy of Minecraft: Java Edition 26.3.
 
+## Download
+
+**[Download the Horizon launcher](https://github.com/ludovic111/horizon/releases?q=launcher-v&expanded=true)** for Linux x86-64, macOS Apple Silicon or Windows x64: take the newest `launcher-v*` release (currently [launcher-v0.1.1](https://github.com/ludovic111/horizon/releases/tag/launcher-v0.1.1)); the launcher then updates itself. The launcher is the way to get Horizon: it installs and updates the game, prepares its resources from your own copy of Minecraft, and starts the client or a dedicated server.
+
+**You need** Minecraft: Java Edition installed with the official launcher, with 26.3 played once; Python 3.10 or newer and Java 25 (a JDK, e.g. Eclipse Temurin 25) for the one-time resource preparation; and a GPU with Vulkan on Linux and Windows, or any Apple Silicon Mac.
+
+### The launcher
+
+<table>
+  <tr>
+    <td width="50%"><img src="launcher/docs/play.png" alt="The launcher's Play page"></td>
+    <td width="50%"><img src="launcher/docs/versions.png" alt="The launcher's Versions page"></td>
+  </tr>
+</table>
+
+It lists Horizon's releases and installs the build for your platform, shows each release's patch notes and the roadmap, updates Horizon and itself, and doubles as a command-line tool and an MCP server. See [the launcher's README](launcher/README.md).
+
 ## Screenshots
 
 Captured in the Rust client itself, with vanilla assets and no mods or shaders.
@@ -69,22 +86,14 @@ The [native client](docs/native-client.md) opens on a vanilla-style title screen
 - shields, maps, books, fireworks, beacons, advancements and statistics;
 - Anvil saves, joining vanilla servers, and opening a world to LAN.
 
-## Getting it
+## Build from source
 
-Builds for **Linux x86-64**, **macOS Apple Silicon** and **Windows x64** are attached to the [releases](https://github.com/ludovic111/horizon/releases). Each folder holds the game, the resource preparation tool and a `PLAY.txt`; the first start prepares the resources from your own copy of the game, as below. You can also build from source.
-
-**Platform.** A GPU with Vulkan on Linux and Windows, or any Apple Silicon Mac. Development and the vanilla harnesses run on Linux.
-
-**Requirements.** Python 3.10 or newer and JDK 25 (for resource preparation). To build from source: Rust 1.90 or newer, and on Linux the ALSA development headers (`libasound2-dev` on Debian and Ubuntu).
-
-### Bring your own copy
+For developers. Requirements: Rust 1.90 or newer, Python 3.10 or newer, JDK 25, and on Linux the ALSA development headers (`libasound2-dev` on Debian and Ubuntu). Development and the vanilla harnesses run on Linux.
 
 Horizon contains no game files and never downloads them. It builds its resources from **your own copy** of Minecraft: Java Edition 26.3, verified against the checksums in `research-lock.json`:
 
 1. **Client:** install Java Edition with the official launcher and play 26.3 once. Horizon reads `versions/26.3/`, `libraries/` and `assets/` from the launcher's game directory (`~/.minecraft` on Linux). If yours lives elsewhere, pass `--minecraft-dir` or set `HORIZON_MINECRAFT_DIR`.
-2. **Server jar:** download the 26.3 server jar yourself, from [minecraft.net/download/server](https://www.minecraft.net/en-us/download/server) while 26.3 is the current release, or otherwise from the `downloads.server.url` in your launcher's `versions/26.3/26.3.json`. Pass it with `--server-jar` or set `HORIZON_SERVER_JAR`. It is only needed the first time.
-
-### Build and run
+2. **Server jar:** the 26.3 server jar, from the `downloads.server.url` in your launcher's `versions/26.3/26.3.json` (or [minecraft.net/download/server](https://www.minecraft.net/en-us/download/server) while 26.3 is the current release). Pass it with `--server-jar` or set `HORIZON_SERVER_JAR`. It is only needed the first time.
 
 ```sh
 git clone https://github.com/ludovic111/horizon.git
@@ -96,73 +105,46 @@ cargo run --release -p horizon-client
 
 Everything prepared lands in the gitignored `.local/`. It is derived from the game: never commit it or share it.
 
-## Usage
-
-The client starts on the title screen. Command-line options (`--world`, `--seed`, `--creative`, `--render-distance`), controls, scripting through `horizon-ctl`, and packaging for another of your own Linux machines are described in [the native client guide](docs/native-client.md).
-
-## Documentation
-
-- [Native client](docs/native-client.md): running, options, controls, scripting and architecture.
-- [Rust rewrite status](docs/rust-parity.md): completion criteria and per-area scope.
-- Parity notes: [block behaviours and ticking](docs/parity/blocks.md), [section meshing](docs/parity/meshing.md).
-- [Decompilation and Rust research lab](docs/research-lab.md): the local game inspection workspace and the first research crates.
-- [Decompilation status](docs/decompilation-status.md).
-- [Java performance packs](docs/java-packs.md): the earlier, no longer developed Java track.
+The client starts on the title screen. Command-line options (`--world`, `--seed`, `--creative`, `--render-distance`, `--dedicated`), controls, scripting through `horizon-ctl`, and the architecture are described in [the native client guide](docs/native-client.md). The rest of the documentation is indexed in [docs/README.md](docs/README.md), including [the parity workflow](docs/parity-workflow.md).
 
 ## Project status
 
-Parity is **not** complete. The table below is the project's own audit of each subsystem. Still missing: the warden's brain and the sculk shrieker summoning it, villager breeding and gossip, the resource pack screen, a dedicated server mode, and worlds older than 1.17.
+The table below is the project's own audit of each subsystem. Every subsystem now matches vanilla in every harness that compares it. 100% means 100% of what the harnesses compare, not proof that nothing else differs. The remaining known differences and the final checks are listed in the roadmap.
 
-### Java parity: 89%
+### Java parity: 100%
 
 Each subsystem scores 0 (absent), 0.25 (started, not playable), 0.5 (playable,
 major vanilla features missing), 0.75 (playable, mostly complete) or 1 (complete
 and verified against vanilla by differential tests). The percentage is the
 average; `tests/test_parity.py` keeps it in sync with this table. Last audited
-2026-10-12 against the harness results: 270 harnesses pass. Two still differ
-from vanilla in places: `mob_ai` (71 of 72 scenarios; a tempted ghastling) and
-`sculk` (427 of 435; shrieker warnings and warden summoning).
+2026-10-13 against the harness results: all 281 harnesses pass on Linux, each
+rerun whenever one of its inputs changed, and the Mac mini now runs every one of
+them too (Rust uses Java's own float maths on each platform).
 
 | Subsystem | Score | Main gaps |
 | --- | ---: | --- |
 | Window, input and game loop | 1 | None: the game loop, options, camera, auto-jump, toggle sprint/sneak, local input and the frame limiter match vanilla |
-| Assets and resources | 0.75 | Item models match vanilla over 196,290 stacks and the client draws every item through them; no resource pack screen |
-| Network protocol and multiplayer | 0.75 | Joins vanilla servers and opens worlds to LAN; server.properties, eula.txt and the user lists match vanilla, but there is no dedicated server mode and LAN hosting is not tested against a vanilla client |
+| Assets and resources | 1 | None: item models match vanilla over 196,290 stacks and the client draws every item through them; the resource pack screen matches vanilla's drawing over 3,000 sessions of clicks, scrolling and searching, its incompatibility confirmation included |
+| Network protocol and multiplayer | 1 | None: joins vanilla servers; the dedicated server (`--dedicated`) matches vanilla's files, status ping, login, configuration, play, chunks, chat, recipes, advancements and command tree, a client built from vanilla's packet code joins it, Horizon joins a vanilla server, and LAN discovery matches over 462 cases (offline mode only) |
 | Chunk storage and palettes | 1 | None: client and saves share paletted containers, identical to vanilla over 266 scenarios |
 | Section meshing | 1 | None: 112 scenes and over a million quads identical to vanilla |
 | Rendering | 1 | None: entity models, block entity renderers (407 cases, End portals, gateways and the loom's banner preview included) and their animations (296 cases, End gateway beams included), the HUD overlays (2,200 states), the recipe book (600 states), the player list, subtitles and the world border match vanilla |
 | Lighting | 1 | None: saved and relit light matches vanilla, slabs and stairs included |
 | World generation | 1 | None: 2,352 whole chunks over 225 structure sites, in all three dimensions, identical to vanilla |
-| Region files and saves | 0.75 | Saves round-trip with vanilla, and worlds from 1.17 to 26.2 upgrade as vanilla's DataFixers do; worlds older than 1.17 are not upgraded |
-| Entities and physics | 0.75 | Attributes, dimensions, death loot, spawn rules, natural spawning (15,500 cases), raids and patrols (1,900 cases), spawned mobs' gear, enchantments and state (`finalizeSpawn`, 24,000 cases) and mob AI (71 of 72 scenarios, villager brains included) match; the warden's brain and villager breeding and gossip are missing |
+| Region files and saves | 1 | None: saves round-trip with vanilla, and worlds from 1.8 to 26.2 upgrade as vanilla's DataFixers do, superflat worlds included; old options.txt and hotbar.nbt files are upgraded too |
+| Entities and physics | 1 | None: attributes, dimensions, death loot, spawn rules, natural spawning (15,500 cases), raids and patrols (1,900 cases), spawned mobs' gear, enchantments and state (`finalizeSpawn`, 24,000 cases) and mob AI (92 scenarios: villager breeding and gossip, the warden, ghastlings and copper golems included) match vanilla |
 | Interaction and inventory | 1 | None: menu clicks match over 8,000 click sequences, the loom and the crafter included; recipe book placement (6,000 cases), its buttons (1,200), the saved book (1,500) and the loom and crafter screens (1,600) match vanilla |
-| Menus, HUD and chat | 0.75 | Every command runs as vanilla (758 commands over 39,685 parsed inputs), scoreboards and teams match (81,000 operations), and the player list matches over 844,758 draw calls; the focused chat is not compared and player list heads use default skins |
+| Menus, HUD and chat | 1 | None: every command runs as vanilla (758 commands over 39,685 parsed inputs), scoreboards and teams match (81,000 operations), the player list matches over 872,000 draw calls with heads drawn from players' skins (authlib's textures, SkinManager's lookup, legacy skin conversion), and the chat matches focused and scrolled; the resource pack screen (selection over 4,000 cases, drawing and its incompatibility confirmation over 3,000 sessions) and the chat input with its command suggestions, usage lines, Tab completion and history (3,000 sessions on vanilla's client command tree) match vanilla |
 | Audio | 1 | None: the sound engine, sound events, music, situational music, ambience and subtitles match vanilla |
-| Block behaviours and ticking | 0.75 | Block updates, random ticks, redstone, dispensers (6,000 cases), crafters (4,000 crafts) and block entity removal (containers spill, 4,000 cases) match vanilla; 8 of 435 sculk scenarios differ (shrieker warnings and warden summoning) and the copper golem's chest sorting is not compared |
-
-### What's new since the previous version
-
-- **Mob AI matches vanilla**, compared tick by tick in 72 scenarios, with villagers on a port of vanilla's brain (memories, sensors, schedules and behaviours).
-- **New mobs:** the breeze and wind charges, the creaking and the creaking heart, the sniffer, the happy ghast and ghastlings, llamas and trader llamas, and the copper golem; the warden's model, animations and emissive layers.
-- **Raids and pillager patrols**, with the Raid Omen, the waves and the Hero of the Village effect.
-- **Dispensers, crafters, the loom and the recipe book**, and containers spill their items when their block is replaced.
-- **Every command runs as vanilla**, including /item modify, /spectate, /waypoint, /dialog and /place.
-- **Scoreboards and teams** in gameplay (criteria, friendly fire, collision, name tags), the **player list**, **subtitles**, every **HUD overlay**, **block entity animations** (chests, shulker boxes, bells, conduits, heads, the enchanting table's book) and **End portals and gateways** drawn with vanilla's shader.
-- **Worlds from 1.17 onwards** open and are upgraded as vanilla does; server.properties, eula.txt and the server user lists are read and written as vanilla does.
-- **Builds for Linux, macOS (Apple Silicon) and Windows.**
+| Block behaviours and ticking | 1 | None: block updates, random ticks, redstone, dispensers (6,000 cases), crafters (4,000 crafts), block entity removal (containers spill, 4,000 cases), copper golem chest sorting and the sculk family (435 scenarios: shrieker warnings and warden summoning included) match vanilla |
 
 ### Roadmap
 
-1. Finish the warden's brain and the sculk shrieker summoning it, and the tempted ghastling.
-2. A dedicated server mode, and LAN hosting tested with a vanilla client.
-3. Save upgrades from before 1.17, and the resource pack screen.
-4. Platform-independent float math, so every harness also gives vanilla's results on macOS.
+**Known differences.** Online-mode servers (Mojang's session servers) are not supported; skins served over https show the default skin unless already cached; pack icons show the unknown-pack texture in game; the creative hotbar keys (C/X) aren't wired to the hotbar loader; item tooltips lack attribute lines.
 
-The rewrite is complete when it reaches one-to-one parity and packaged native builds pass the launch checks in [Rust rewrite status](docs/rust-parity.md#completion-criteria-and-playable-builds).
+**Final checks.** A from-scratch audit (`tools/parity.py --all`) on Linux and on macOS, and the launch checks on the packaged Linux, macOS and Windows builds listed in [Rust rewrite status](docs/rust-parity.md#completion-criteria-and-playable-builds).
 
-### After the rewrite
-
-Once Horizon matches vanilla, the plan is to build on that exact base:
+**Next.** With vanilla parity as the base:
 
 - **Performance:** optimize the client and the server as far as they can go (rendering, chunk generation and meshing, memory, multithreaded ticking) while the differential harnesses keep gameplay identical to vanilla.
 - **Modding support:** a stable API for writing mods against Horizon.

benchmarks/client-graphics-2026-10-04/live-observations.json

@@ -1,401 +0,0 @@
-{
-  "schema": 1,
-  "measurement": "Client scene startup, framebuffer readback and clean exit; not a performance benchmark",
-  "release_binary": "0.20.0",
-  "production_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-  "macos_required_ci": {
-    "run": 37192178667,
-    "source_commit": "a5000edf11094e00ebef0fc362aa4adc322f2df6",
-    "all_jobs_passed": true,
-    "reports": {
-      "title": {
-        "schema": 1,
-        "platform": "macOS-26.6.2-arm64-arm-64bit",
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-                "operation": "load_library",
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-                "backend": "OpenGL",
-                "operation": "create_device",
-                "result": "success"
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-          {
-            "observed_mode": "title",
-            "title_screen_observed": true,
-            "world_loaded": false,
-            "ready_client_ticks": 55,
-            "window_active": true,
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-            "gpu": "Apple Software Renderer",
-            "graphics_backend": "OpenGL",
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-            "profile": "m2-balanced",
-            "preferred_backend": "opengl",
-            "launcher_exit_code": 0,
-            "backend_attempts": [
-              {
-                "backend": "OpenGL",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "OpenGL",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ]
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-        ],
-        "limits": [
-          "Short scene startup and nonuniform framebuffer readback only.",
-          "World mode uses the ordinary limited demo; world files remain private.",
-          "No exhaustive gameplay, visual-correctness, FPS or M2 Pro performance claim.",
-          "Vulkan preference can fall back; inspect the observed backend.",
-          "PNG images, assets and full logs remain in the private runtime directory."
-        ]
-      },
-      "world": {
-        "schema": 1,
-        "platform": "macOS-26.6.2-arm64-arm-64bit",
-        "architecture": "arm64",
-        "minecraft": "26.3",
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-                "operation": "create_device",
-                "result": "success"
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-        "limits": [
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-          "World mode uses the ordinary limited demo; world files remain private.",
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-          "Vulkan preference can fall back; inspect the observed backend.",
-          "PNG images, assets and full logs remain in the private runtime directory."
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-          "operation": "create_device",
-          "result": "success"
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-  "limits": [
-    "macOS OpenGL uses Apple Software Renderer; Vulkan exposes Apple Paravirtual device. No physical M2 GPU performance test.",
-    "World-mode checks ordinary limited-demo world startup and saved data, not exhaustive gameplay or completed LOD generation.",
-    "A nonuniform framebuffer does not prove pixel-correct rendering.",
-    "Three exploratory Vulkan cases fail with VK_ERROR_FEATURE_NOT_PRESENT after successful device creation; later stage remains to be isolated.",
-    "The probe uses 3 GiB; balanced can warn about low memory. The 16 GB Mac starter suggests 6 GiB.",
-    "No FPS, CPU/RAM reduction, statistical speedup or universal hardware-compatibility claim.",
-    "Raw PNGs, assets, world files and full logs remain private. Production JAR matches the published binary and excludes probe classes."
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benchmarks/core-client-2026-10-04/live-observations.json

@@ -1,303 +0,0 @@
-{
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-    "iris_shaders": "not installed",
-    "heap_max": "3G",
-    "collector": "G1",
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-    "world_difficulty": "PEACEFUL",
-    "fov": 70,
-    "graphics_preset": "CUSTOM",
-    "frame_limit": "uncapped",
-    "all_original_controllers": false
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-        "[email protected]+52268a0e5d",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+26.3",
-        "java@25",
-        "[email protected]+mc26.3",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+mc26.3",
-        "[email protected]",
-        "[email protected]"
-      ],
-      "preceding_jfr_server_render_allocation_counters": [
-        {
-          "thread_id": 55,
-          "thread": "Server thread",
-          "counter_observations": 2,
-          "observed_seconds": 64.387372441,
-          "observed_allocated_bytes": 691148360,
-          "observed_bytes_per_second": 10734222.158752
-        },
-        {
-          "thread_id": 3,
-          "thread": "Render thread",
-          "counter_observations": 2,
-          "observed_seconds": 64.387372441,
-          "observed_allocated_bytes": 107888768,
-          "observed_bytes_per_second": 1675619.9843200867
-        }
-      ],
-      "preceding_jfr_gc_pause_total_ms": 54.65954,
-      "preceding_jfr_gc_pause_longest_ms": 25.746574,
-      "exit_code": 0
-    }
-  ],
-  "provenance": {
-    "production_mod_source_commit": "2a268fefbf0ab3d478ca7755e609f7146d6f5145",
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37179596850",
-    "runtime_mod_matches_linux_ci": true,
-    "original_mod_sha256": "df0bab0a6d87a1c609a051c190939010506f8cdd81897e82aa48caad032ef4e0",
-    "initial_player_snapshot_sha256": "b4d11dbd6443625415a1e32aa242d0e2d09cd77ddb1becfde5d35cb6ab8d278a",
-    "saved_first_cameras_match": true,
-    "saved_camera": {
-      "position": [
-        -56.5,
-        69.0,
-        55.5
-      ],
-      "rotation": [
-        141.5,
-        16.950002670288086
-      ]
-    },
-    "private_world_timing_protocol": {
-      "world_copy": "private only",
-      "advance_time": false,
-      "advance_weather": false,
-      "overworld_clock_ticks": 6000,
-      "modified_file_sha256": {
-        "game_rules": "47abf5e1fe82d54057ad7b095df3b9e29a8e4e9db7484988e09f3caaeedc12eb",
-        "world_clocks": "575d4a7663b154077a5be4c596790f3af178a00ab5a1e9cd58f37c1afa2c03b5"
-      },
-      "level_and_player_files_unchanged": true,
-      "pack_default_rules_unchanged": true
-    },
-    "clock_and_rules_verified_after_both_saves": true,
-    "candidate_save_reload_second_save_exit_zero": true
-  },
-  "notes": [
-    "Separate private copies, baseline then core. JFR begins about 121 seconds after demo dismissal; a separate 120-second frame capture begins about 307 seconds after dismissal.",
-    "Both captures have zero menu/pause/focus exclusions and no drops. Actual CSV counts and means match; viewer charts, 390-pixel layout and explicit software-change warnings pass.",
-    "Core records about 20.7% higher average FPS and 22.2% lower sampled peak RSS in this pair; whole-process CPU is slightly higher while rendering more frames.",
-    "No mod is isolated by this group comparison. Rendering-work completion, entity activity, cache/JIT and thermal state remain variables. Matching captured configuration is not pixel equivalence or exhaustive vanilla gameplay proof.",
-    "Tick execution inverse meanRate is capacity, not actual TPS. Record counts/elapsed seconds are exposed separately and include any pauses. Both captures have about 20 tick samples per elapsed second.",
-    "Preceding JFR server/render allocation counters are lower with core, but total and longest measured GC pauses are higher. Those profiles precede the frame captures and are not simultaneous with them.",
-    "No hardware GPU or M2/Apple Silicon result; RSS is not complete unified/GPU memory. Repeat alternating trials on real hardware.",
-    "No private worlds, full game logs, JFR recordings, game binaries or fixture agents are included."
-  ]
-}

benchmarks/culling-empty-2026-10-04/linux-applied-hooks.json

@@ -1,47 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-6.17.0-1022-azure-x86_64-with-glibc2.39",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "entity_culling": "1.11.2",
-  "results": [
-    {
-      "enabled": false,
-      "empty_iterator_calls": 1,
-      "live_registration_checked": true,
-      "block_callback_order_checked": true,
-      "type_guard_checked": true,
-      "allocated_bytes": 128001272,
-      "cpu_ns": 29632156,
-      "wall_ns": 49712014,
-      "measured_calls": 4000000,
-      "result": false
-    },
-    {
-      "enabled": true,
-      "empty_iterator_calls": 0,
-      "live_registration_checked": true,
-      "block_callback_order_checked": true,
-      "type_guard_checked": true,
-      "allocated_bytes": 208,
-      "cpu_ns": 809881,
-      "wall_ns": 801517,
-      "measured_calls": 4000000,
-      "result": false
-    }
-  ],
-  "notes": [
-    "Actual publisher whitelist methods inside Fabric; live registration and block-entity callbacks checked.",
-    "Nonempty iteration, callback order, short circuit, null/wrong-type inputs and clearing retain upstream behavior.",
-    "Empty-state iterator counts use a private instrumented set; allocation loop uses normal empty HashSets.",
-    "Entity callbacks with a valid game entity are not exercised by this menu-only fixture.",
-    "JIT escape analysis can remove allocations in an isolated loop; real culling-thread profiles are needed.",
-    "Not a game FPS, whole-game RAM, visual equivalence or Mac GPU benchmark.",
-    "Much of an empty warmed loop may be folded by the JIT; CPU timings are not per-check costs or game speed estimates."
-  ],
-  "provenance": {
-    "source_commit": "35dd69e9a6279fa89d762a0d24e49b0dbdb11b51",
-    "ci_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37164002916",
-    "artifact": "horizon-ubuntu-latest"
-  }
-}

benchmarks/culling-rays-2026-10-04/linux-applied-hooks.json

@@ -1,57 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-6.17.0-1022-azure-x86_64-with-glibc2.39",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "entity_culling": "1.11.2",
-  "original_mod_sha256": "7351b417fc83460def5947636444413874ee812e949342f091ef03674e0c0e58",
-  "results": [
-    {
-      "enabled": false,
-      "public_boxes": 12800,
-      "provider_reads": 105239,
-      "edge_rays": 2197,
-      "visibility_digest": "da7286327283ce854dca2ab798d97c3b1cde55ac67112bd231c48df6d9388e00",
-      "query_digest": "124074ad764ab680b93896d47fa347a15f0b17ef41d2f8af5bd8e75f75208e12",
-      "intersection_digest": "f311c0b608b44b9eab2bb1e6347c3e18b003d05c939a8fbea9ba81fb16c8e8ae",
-      "allocated_bytes": 1040,
-      "cpu_ns": 101807697,
-      "wall_ns": 162651689,
-      "measured_checks": 2000000,
-      "checksum": 0,
-      "input_unchanged": true,
-      "scratch_ownership_checked": true
-    },
-    {
-      "enabled": true,
-      "public_boxes": 12800,
-      "provider_reads": 105239,
-      "edge_rays": 2197,
-      "visibility_digest": "da7286327283ce854dca2ab798d97c3b1cde55ac67112bd231c48df6d9388e00",
-      "query_digest": "124074ad764ab680b93896d47fa347a15f0b17ef41d2f8af5bd8e75f75208e12",
-      "intersection_digest": "f311c0b608b44b9eab2bb1e6347c3e18b003d05c939a8fbea9ba81fb16c8e8ae",
-      "allocated_bytes": 920,
-      "cpu_ns": 118540489,
-      "wall_ns": 235470173,
-      "measured_checks": 2000000,
-      "checksum": 0,
-      "input_unchanged": true,
-      "scratch_ownership_checked": true
-    }
-  ],
-  "notes": [
-    "Actual upstream culling methods inside Fabric; private fixture invokers do not enter production packs.",
-    "Two interleaved instances and several occluder patterns; matching boolean and query digests.",
-    "Signed zero, tiny/large values, infinities and NaN are exercised directly in ray intersection.",
-    "Unchanged input vectors, independent instance scratch and upstream arithmetic values are checked.",
-    "Allocation and CPU are single warmed caller-loop observations; JIT folding can vary.",
-    "Not a game FPS, visual-equivalence proof, whole-game RAM or Mac GPU benchmark."
-  ],
-  "provenance": {
-    "source_commit": "7cbe37b60594fb1631bc308f126d7925c4264a18",
-    "command": "python tools/test_culling_rays.py",
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37168352974",
-    "job": "portable-mod (ubuntu-latest)",
-    "artifact": "horizon-ubuntu-latest"
-  }
-}

benchmarks/culling-rays-2026-10-04/live-observations.json

@@ -1,71 +0,0 @@
-{
-  "schema": 1,
-  "minecraft": "26.3",
-  "entity_culling": "1.11.2",
-  "original_mod_sha256": "7351b417fc83460def5947636444413874ee812e949342f091ef03674e0c0e58",
-  "platform": "Linux x86_64",
-  "graphics": "llvmpipe software OpenGL",
-  "settings": {
-    "heap_bytes": 3221225472,
-    "gc": "G1",
-    "compact_headers": true,
-    "render_distance": 12,
-    "simulation_distance": 12,
-    "lod_radius_chunks": 128,
-    "lod_quality": "MEDIUM/MEDIUM/BLOCK",
-    "terrain_workers": 2,
-    "runtime_ratio": 0.5,
-    "world_difficulty": "PEACEFUL",
-    "empty_culling_whitelist": false
-  },
-  "results": [
-    {
-      "profile": "m2-balanced",
-      "ray_enabled": false,
-      "elapsed_seconds": 120.02619604,
-      "frame_samples": 599,
-      "tick_samples": 2400,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "visual_settings_changed": [],
-      "culling_allocation_counter": {
-        "thread_id": 49,
-        "thread": "CullThread",
-        "counter_observations": 2,
-        "observed_seconds": 64.509265987,
-        "observed_allocated_bytes": 1817768,
-        "observed_bytes_per_second": 28178.40153949851
-      }
-    },
-    {
-      "profile": "culling-rays",
-      "ray_enabled": true,
-      "elapsed_seconds": 120.099980458,
-      "frame_samples": 584,
-      "tick_samples": 2401,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "visual_settings_changed": [],
-      "culling_allocation_counter": {
-        "thread_id": 49,
-        "thread": "CullThread",
-        "counter_observations": 2,
-        "observed_seconds": 64.321034235,
-        "observed_allocated_bytes": 1798336,
-        "observed_bytes_per_second": 27958.754416629756
-      }
-    }
-  ],
-  "notes": [
-    "Fixed-order single pair using separate copies of the same private saved world and stationary view, with approximately three-minute warm-up before clean frame recordings.",
-    "One earlier candidate frame capture contained pause exclusions and was discarded; its separate preceding allocation recording had already completed.",
-    "Allocation counters have their own roughly 64-second observation spans; recordings started approximately 36-42 seconds after joining. Profiling overhead and JIT/cache effects are not eliminated.",
-    "Both worlds saved and exited with no crash report or remaining game process. The outer foreground control launcher returned 143; it did not expose the game exit status.",
-    "No useful allocation reduction or whole-game speedup is established. Not a Mac, retained-memory or GPU performance benchmark."
-  ],
-  "provenance": {
-    "source_commit": "349724b3b612351daa1616daa79beca8897839ab",
-    "runtime_mod_matches_linux_ci": true,
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37168818519"
-  }
-}

benchmarks/culling-rays-2026-10-04/local-applied-hooks.json

@@ -1,54 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "entity_culling": "1.11.2",
-  "original_mod_sha256": "7351b417fc83460def5947636444413874ee812e949342f091ef03674e0c0e58",
-  "results": [
-    {
-      "enabled": false,
-      "public_boxes": 12800,
-      "provider_reads": 105239,
-      "edge_rays": 2197,
-      "visibility_digest": "da7286327283ce854dca2ab798d97c3b1cde55ac67112bd231c48df6d9388e00",
-      "query_digest": "124074ad764ab680b93896d47fa347a15f0b17ef41d2f8af5bd8e75f75208e12",
-      "intersection_digest": "f311c0b608b44b9eab2bb1e6347c3e18b003d05c939a8fbea9ba81fb16c8e8ae",
-      "allocated_bytes": 24318096,
-      "cpu_ns": 166989515,
-      "wall_ns": 239648128,
-      "measured_checks": 2000000,
-      "checksum": 0,
-      "input_unchanged": true,
-      "scratch_ownership_checked": true
-    },
-    {
-      "enabled": true,
-      "public_boxes": 12800,
-      "provider_reads": 105239,
-      "edge_rays": 2197,
-      "visibility_digest": "da7286327283ce854dca2ab798d97c3b1cde55ac67112bd231c48df6d9388e00",
-      "query_digest": "124074ad764ab680b93896d47fa347a15f0b17ef41d2f8af5bd8e75f75208e12",
-      "intersection_digest": "f311c0b608b44b9eab2bb1e6347c3e18b003d05c939a8fbea9ba81fb16c8e8ae",
-      "allocated_bytes": 920,
-      "cpu_ns": 149367051,
-      "wall_ns": 165549458,
-      "measured_checks": 2000000,
-      "checksum": 0,
-      "input_unchanged": true,
-      "scratch_ownership_checked": true
-    }
-  ],
-  "notes": [
-    "Actual upstream culling methods inside Fabric; private fixture invokers do not enter production packs.",
-    "Two interleaved instances and several occluder patterns; matching boolean and query digests.",
-    "Signed zero, tiny/large values, infinities and NaN are exercised directly in ray intersection.",
-    "Unchanged input vectors, independent instance scratch and upstream arithmetic values are checked.",
-    "Allocation and CPU are single warmed caller-loop observations; JIT folding can vary.",
-    "Not a game FPS, visual-equivalence proof, whole-game RAM or Mac GPU benchmark."
-  ],
-  "provenance": {
-    "source_commit": "7cbe37b60594fb1631bc308f126d7925c4264a18",
-    "command": "python tools/test_culling_rays.py"
-  }
-}

benchmarks/debounce-queue-2026-10-03/macos-26.txt

@@ -1,14 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Darwin 25.6.0 arm64; logical CPUs 3
-mode=upstream size=1 polls=2050320 worker_cpu_ms=218.517 wall_ms=250.000 worker_allocated_bytes=65610240
-mode=wait size=1 polls=24 worker_cpu_ms=1.116 wall_ms=250.103 worker_allocated_bytes=768
-mode=upstream size=1 polls=2641880 worker_cpu_ms=247.157 wall_ms=250.000 worker_allocated_bytes=84540160
-mode=wait size=1 polls=26 worker_cpu_ms=0.873 wall_ms=258.012 worker_allocated_bytes=832
-mode=upstream size=1 polls=2502067 worker_cpu_ms=248.481 wall_ms=250.000 worker_allocated_bytes=80066144
-mode=wait size=1 polls=22 worker_cpu_ms=0.693 wall_ms=252.426 worker_allocated_bytes=704
-mode=upstream size=64 polls=1073260 worker_cpu_ms=249.930 wall_ms=250.000 worker_allocated_bytes=34344320
-mode=wait size=64 polls=21 worker_cpu_ms=0.624 wall_ms=251.431 worker_allocated_bytes=672
-mode=upstream size=64 polls=1117775 worker_cpu_ms=248.519 wall_ms=250.000 worker_allocated_bytes=35768800
-mode=wait size=64 polls=66 worker_cpu_ms=1.172 wall_ms=252.401 worker_allocated_bytes=2112
-mode=upstream size=64 polls=1017233 worker_cpu_ms=248.550 wall_ms=250.000 worker_allocated_bytes=32551456
-mode=wait size=64 polls=74 worker_cpu_ms=1.154 wall_ms=250.207 worker_allocated_bytes=2368

benchmarks/debounce-queue-2026-10-03/ubuntu-latest.txt

@@ -1,14 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Linux 6.17.0-1022-azure x86_64; logical CPUs 4
-mode=upstream size=1 polls=3147912 worker_cpu_ms=248.446 wall_ms=250.000 worker_allocated_bytes=100733184
-mode=wait size=1 polls=234 worker_cpu_ms=3.085 wall_ms=250.068 worker_allocated_bytes=7488
-mode=upstream size=1 polls=3108002 worker_cpu_ms=249.985 wall_ms=250.000 worker_allocated_bytes=99456064
-mode=wait size=1 polls=235 worker_cpu_ms=2.960 wall_ms=250.088 worker_allocated_bytes=7520
-mode=upstream size=1 polls=3073051 worker_cpu_ms=248.404 wall_ms=250.000 worker_allocated_bytes=98337632
-mode=wait size=1 polls=235 worker_cpu_ms=2.904 wall_ms=250.067 worker_allocated_bytes=7520
-mode=upstream size=64 polls=999765 worker_cpu_ms=248.680 wall_ms=250.000 worker_allocated_bytes=31992480
-mode=wait size=64 polls=235 worker_cpu_ms=2.887 wall_ms=250.067 worker_allocated_bytes=7520
-mode=upstream size=64 polls=999096 worker_cpu_ms=250.000 wall_ms=250.000 worker_allocated_bytes=31971072
-mode=wait size=64 polls=234 worker_cpu_ms=2.890 wall_ms=250.068 worker_allocated_bytes=7488
-mode=upstream size=64 polls=992373 worker_cpu_ms=249.987 wall_ms=250.000 worker_allocated_bytes=31755936
-mode=wait size=64 polls=234 worker_cpu_ms=2.891 wall_ms=250.068 worker_allocated_bytes=7488

benchmarks/debounce-queue-2026-10-03/windows-latest.txt

@@ -1,14 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Windows 2025Server AMD64; logical CPUs 4
-mode=upstream size=1 polls=3016566 worker_cpu_ms=234.375 wall_ms=250.000 worker_allocated_bytes=96530112
-mode=wait size=1 polls=173 worker_cpu_ms=0.000 wall_ms=250.006 worker_allocated_bytes=5536
-mode=upstream size=1 polls=2991508 worker_cpu_ms=250.000 wall_ms=250.000 worker_allocated_bytes=95728256
-mode=wait size=1 polls=175 worker_cpu_ms=0.000 wall_ms=250.856 worker_allocated_bytes=5600
-mode=upstream size=1 polls=2979343 worker_cpu_ms=250.000 wall_ms=250.000 worker_allocated_bytes=95338976
-mode=wait size=1 polls=171 worker_cpu_ms=0.000 wall_ms=251.306 worker_allocated_bytes=5472
-mode=upstream size=64 polls=1001664 worker_cpu_ms=250.000 wall_ms=250.000 worker_allocated_bytes=32053248
-mode=wait size=64 polls=168 worker_cpu_ms=0.000 wall_ms=250.695 worker_allocated_bytes=5376
-mode=upstream size=64 polls=1001600 worker_cpu_ms=250.000 wall_ms=250.000 worker_allocated_bytes=32051200
-mode=wait size=64 polls=166 worker_cpu_ms=0.000 wall_ms=250.593 worker_allocated_bytes=5312
-mode=upstream size=64 polls=988856 worker_cpu_ms=234.375 wall_ms=250.000 worker_allocated_bytes=31643392
-mode=wait size=64 polls=171 worker_cpu_ms=0.000 wall_ms=250.557 worker_allocated_bytes=5472

benchmarks/debounce-queue-2026-10-04/live-observations.json

@@ -1,196 +0,0 @@
-{
-  "schema": 1,
-  "measurement": "Single fixed-order stationary Linux software-rendered pair; targeted allocation observation, not a statistical FPS/RAM comparison",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "java_vendor": "Ubuntu",
-  "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-  "graphics": "llvmpipe LLVM21.1.8 OpenGL, 1280x800",
-  "captured_settings_match": true,
-  "settings": {
-    "render_distance": 12,
-    "simulation_distance": 12,
-    "lod_radius": 128,
-    "lod_quality": "MEDIUM/MEDIUM BLOCK",
-    "terrain_workers": 2,
-    "runtime_ratio_start_and_end": 0.5,
-    "world_difficulty": "PEACEFUL",
-    "fov": 70,
-    "heap_max": "3G",
-    "collector": "G1",
-    "compact_headers": true,
-    "frame_limit": "uncapped",
-    "other_original_controllers": false,
-    "interruptible_terrain_read": true
-  },
-  "runs": [
-    {
-      "profile": "m2-balanced",
-      "elapsed_seconds": 120.305371929,
-      "frame_samples": 230,
-      "tick_samples": 2401,
-      "tick_elapsed_seconds": 120.040272048,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "frame_stats": {
-        "count": 230,
-        "meanMs": 519.2565329826086,
-        "p50Ms": 492.583608,
-        "p95Ms": 700.364095,
-        "p99Ms": 803.28719,
-        "maxMs": 955.16614,
-        "meanRate": 1.9258303679994195,
-        "lowOnePercentRate": 1.146414365311511,
-        "over16Ms": 230,
-        "over33Ms": 230,
-        "over50Ms": 230,
-        "over100Ms": 230
-      },
-      "tick_execution_stats": {
-        "count": 2401,
-        "meanMs": 9.248066071636819,
-        "p50Ms": 8.529226,
-        "p95Ms": 16.494711,
-        "p99Ms": 23.483163,
-        "maxMs": 65.248147,
-        "meanRate": 108.13071535755256,
-        "lowOnePercentRate": 29.893225023275733,
-        "over16Ms": 113,
-        "over33Ms": 9,
-        "over50Ms": 2,
-        "over100Ms": 0
-      },
-      "process_cpu_seconds": 432.81,
-      "process_rss_peak_sampled_bytes": 2898677760,
-      "queue_wait": false,
-      "wakeable_idle": false,
-      "queue_allocation_counters": [
-        {
-          "thread_id": 86,
-          "thread": "DH-Chunk Update Queue [minecraft:overworld] Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.391610411,
-          "observed_allocated_bytes": 982644080,
-          "observed_bytes_per_second": 15260436.471893786
-        },
-        {
-          "thread_id": 93,
-          "thread": "DH-Chunk Update Queue [minecraft:the_end] Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.391610411,
-          "observed_allocated_bytes": 66520,
-          "observed_bytes_per_second": 1033.0538338055978
-        },
-        {
-          "thread_id": 98,
-          "thread": "DH-Chunk Update Queue [minecraft:the_nether] Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.391610411,
-          "observed_allocated_bytes": 66408,
-          "observed_bytes_per_second": 1031.3144767793467
-        }
-      ],
-      "preceding_jfr_gc_pause_total_ms": 178.149902,
-      "preceding_jfr_gc_pause_longest_ms": 34.011115,
-      "world_save_and_exit_zero": true
-    },
-    {
-      "profile": "queue-wait",
-      "elapsed_seconds": 120.448597645,
-      "frame_samples": 225,
-      "tick_samples": 2401,
-      "tick_elapsed_seconds": 120.040563501,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "frame_stats": {
-        "count": 225,
-        "meanMs": 529.5368389244444,
-        "p50Ms": 502.825816,
-        "p95Ms": 717.088739,
-        "p99Ms": 798.871994,
-        "maxMs": 843.221511,
-        "meanRate": 1.8884427418328913,
-        "lowOnePercentRate": 1.2159699757233216,
-        "over16Ms": 225,
-        "over33Ms": 225,
-        "over50Ms": 225,
-        "over100Ms": 225
-      },
-      "tick_execution_stats": {
-        "count": 2401,
-        "meanMs": 9.375896729279466,
-        "p50Ms": 8.803401,
-        "p95Ms": 16.938218,
-        "p99Ms": 22.983944,
-        "maxMs": 63.421671,
-        "meanRate": 106.65646485601272,
-        "lowOnePercentRate": 31.02504677094056,
-        "over16Ms": 128,
-        "over33Ms": 7,
-        "over50Ms": 2,
-        "over100Ms": 0
-      },
-      "process_cpu_seconds": 430.67,
-      "process_rss_peak_sampled_bytes": 2989219840,
-      "queue_wait": true,
-      "wakeable_idle": true,
-      "queue_allocation_counters": [
-        {
-          "thread_id": 88,
-          "thread": "DH-Chunk Update Queue [minecraft:overworld] Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.387296767,
-          "observed_allocated_bytes": 739640,
-          "observed_bytes_per_second": 11487.359108684974
-        },
-        {
-          "thread_id": 93,
-          "thread": "DH-Chunk Update Queue [minecraft:the_nether] Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.387296767,
-          "observed_allocated_bytes": 0,
-          "observed_bytes_per_second": 0.0
-        },
-        {
-          "thread_id": 100,
-          "thread": "DH-Chunk Update Queue [minecraft:the_end] Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.387296767,
-          "observed_allocated_bytes": 0,
-          "observed_bytes_per_second": 0.0
-        }
-      ],
-      "preceding_jfr_gc_pause_total_ms": 151.522451,
-      "preceding_jfr_gc_pause_longest_ms": 47.79999,
-      "world_save_and_exit_zero": true
-    }
-  ],
-  "provenance": {
-    "production_mod_source_commit": "24c65f512dece83b153b206e33cd4c4294b42de2",
-    "original_mod_sha256": "2196637c5b2180a33fa5b926ab51069ab480618c1186b8a02872c7e758be0a70",
-    "initial_player_snapshot_sha256": "b4d11dbd6443625415a1e32aa242d0e2d09cd77ddb1becfde5d35cb6ab8d278a",
-    "source_level_snapshot_sha256": "86a3c75ea993e50c4428da4dbadc5856688a9367f035c41b8bb49863a9aeb644",
-    "first_saved_cameras_match": true,
-    "saved_camera": {
-      "position": [
-        -56.5,
-        69.0,
-        55.5
-      ],
-      "rotation": [
-        141.5,
-        16.950002670288086
-      ]
-    }
-  },
-  "notes": [
-    "Separate copies of the same private world; candidate then control. JFR begins about121seconds after demo dismissal; frame capture begins about307seconds after dismissal.",
-    "JFR allocation counters span about64seconds; pause measurements are from the preceding JFR recordings, not the later frame capture.",
-    "Recorded overworld queue allocation counter rate is about15.3MB/s upstream versus11.5KB/s with waiting. Task-completion and generated geometry volumes are not controlled quantitatively.",
-    "Control has230frames versus225candidate; sampled peak RSS is lower in control, and later whole-process CPU differences are small. No game FPS, retained-memory or whole-process CPU improvement is established.",
-    "Daylight advances normally; lighting, entity activity and cache/JIT differences are not fully controlled. No Apple Silicon or hardware-GPU result.",
-    "Tick meanRate is inverse execution duration, not observed TPS. Both recordings contain2401tick execution samples over about120seconds.",
-    "Actual JSON/CSV viewer comparisons and390pxlayout pass. The real discarded capture with zero eligible frames and209exclusions is rejected by the viewer and excluded from performance comparisons.",
-    "No private worlds, full game logs or JFR recordings are published."
-  ]
-}

benchmarks/dispatch-retry-2026-10-04/linux-applied-hooks.json

@@ -1,34 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-6.17.0-1022-azure-x86_64-with-glibc2.39",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "results": [
-    {
-      "enabled": false,
-      "submission_allocated_bytes": 216987192,
-      "submission_cpu_ns": 372949442,
-      "submission_wall_ns": 401548875,
-      "rejections": 63790,
-      "tasks_completed": 2,
-      "occupied_slots": 0
-    },
-    {
-      "enabled": true,
-      "submission_allocated_bytes": 103384,
-      "submission_cpu_ns": 941367,
-      "submission_wall_ns": 959453,
-      "rejections": 6,
-      "tasks_completed": 2,
-      "occupied_slots": 0
-    }
-  ],
-  "notes": [
-    "Synthetic full physical worker queue; both modes use the actual publisher dispatcher inside Fabric.",
-    "Allocation and CPU measure the submission caller only; retry scheduler activity is excluded.",
-    "Upstream keeps the caller blocked for the requested 200 ms observation window; patched returns earlier.",
-    "Both modes verify exact task counts, recovered occupied slots and fixture worker shutdown.",
-    "Not a game FPS, terrain completion, whole-game RAM, or hardware compatibility benchmark."
-  ]
-}

benchmarks/idle-queue-2026-10-03/macos-26.txt

@@ -1,42 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Darwin 25.6.0 arm64; logical CPUs 3
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-mode=wakeable trial=17 incoming_after_idle_ms=25.080 publication_to_pop_ms=0.053
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-mode=wakeable trial=19 incoming_after_idle_ms=16.349 publication_to_pop_ms=0.083

benchmarks/idle-queue-2026-10-03/ubuntu-latest.txt

@@ -1,42 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Linux 6.17.0-1022-azure x86_64; logical CPUs 4
-mode=upstream trial=0 incoming_after_idle_ms=5.089 publication_to_pop_ms=45.143
-mode=wakeable trial=0 incoming_after_idle_ms=5.100 publication_to_pop_ms=0.073
-mode=upstream trial=1 incoming_after_idle_ms=5.125 publication_to_pop_ms=45.051
-mode=wakeable trial=1 incoming_after_idle_ms=5.097 publication_to_pop_ms=0.055
-mode=upstream trial=2 incoming_after_idle_ms=5.098 publication_to_pop_ms=45.135
-mode=wakeable trial=2 incoming_after_idle_ms=5.088 publication_to_pop_ms=0.042
-mode=upstream trial=3 incoming_after_idle_ms=5.091 publication_to_pop_ms=45.084
-mode=wakeable trial=3 incoming_after_idle_ms=5.149 publication_to_pop_ms=0.049
-mode=upstream trial=4 incoming_after_idle_ms=5.103 publication_to_pop_ms=45.060
-mode=wakeable trial=4 incoming_after_idle_ms=5.141 publication_to_pop_ms=0.064
-mode=upstream trial=5 incoming_after_idle_ms=5.127 publication_to_pop_ms=45.047
-mode=wakeable trial=5 incoming_after_idle_ms=5.137 publication_to_pop_ms=0.053
-mode=upstream trial=6 incoming_after_idle_ms=5.129 publication_to_pop_ms=45.177
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-mode=upstream trial=7 incoming_after_idle_ms=5.107 publication_to_pop_ms=45.059
-mode=wakeable trial=7 incoming_after_idle_ms=5.137 publication_to_pop_ms=0.061
-mode=upstream trial=8 incoming_after_idle_ms=5.168 publication_to_pop_ms=45.005
-mode=wakeable trial=8 incoming_after_idle_ms=5.134 publication_to_pop_ms=0.060
-mode=upstream trial=9 incoming_after_idle_ms=5.105 publication_to_pop_ms=45.077
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-mode=upstream trial=12 incoming_after_idle_ms=5.095 publication_to_pop_ms=45.070
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-mode=upstream trial=16 incoming_after_idle_ms=5.129 publication_to_pop_ms=45.051
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-mode=upstream trial=17 incoming_after_idle_ms=5.148 publication_to_pop_ms=45.034
-mode=wakeable trial=17 incoming_after_idle_ms=5.148 publication_to_pop_ms=0.044
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-mode=wakeable trial=18 incoming_after_idle_ms=5.127 publication_to_pop_ms=0.046
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-mode=wakeable trial=19 incoming_after_idle_ms=5.148 publication_to_pop_ms=0.051

benchmarks/idle-queue-2026-10-03/windows-latest.txt

@@ -1,42 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Windows 2025Server AMD64; logical CPUs 4
-mode=upstream trial=0 incoming_after_idle_ms=5.487 publication_to_pop_ms=45.519
-mode=wakeable trial=0 incoming_after_idle_ms=5.377 publication_to_pop_ms=0.127
-mode=upstream trial=1 incoming_after_idle_ms=6.059 publication_to_pop_ms=44.593
-mode=wakeable trial=1 incoming_after_idle_ms=5.539 publication_to_pop_ms=0.094
-mode=upstream trial=2 incoming_after_idle_ms=5.096 publication_to_pop_ms=45.005
-mode=wakeable trial=2 incoming_after_idle_ms=5.624 publication_to_pop_ms=0.079
-mode=upstream trial=3 incoming_after_idle_ms=5.649 publication_to_pop_ms=44.691
-mode=wakeable trial=3 incoming_after_idle_ms=4.731 publication_to_pop_ms=0.077
-mode=upstream trial=4 incoming_after_idle_ms=5.312 publication_to_pop_ms=45.488
-mode=wakeable trial=4 incoming_after_idle_ms=5.156 publication_to_pop_ms=0.108
-mode=upstream trial=5 incoming_after_idle_ms=5.190 publication_to_pop_ms=45.580
-mode=wakeable trial=5 incoming_after_idle_ms=5.457 publication_to_pop_ms=0.077
-mode=upstream trial=6 incoming_after_idle_ms=5.141 publication_to_pop_ms=45.619
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-mode=upstream trial=7 incoming_after_idle_ms=5.823 publication_to_pop_ms=44.487
-mode=wakeable trial=7 incoming_after_idle_ms=5.355 publication_to_pop_ms=0.066
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-mode=wakeable trial=17 incoming_after_idle_ms=5.220 publication_to_pop_ms=0.066
-mode=upstream trial=18 incoming_after_idle_ms=5.358 publication_to_pop_ms=46.008
-mode=wakeable trial=18 incoming_after_idle_ms=5.156 publication_to_pop_ms=0.062
-mode=upstream trial=19 incoming_after_idle_ms=4.370 publication_to_pop_ms=47.015
-mode=wakeable trial=19 incoming_after_idle_ms=5.162 publication_to_pop_ms=0.073

benchmarks/mac-vulkan-2026-10-04/live-observations.json

@@ -1,930 +0,0 @@
-{
-  "schema": 1,
-  "measurement": "Failed hosted macOS Vulkan graphics probes, not performance measurements",
-  "source_commit": "8282a731ecc08691f798a3ec596c7cc1d4f1dad1",
-  "run_url": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37193558884",
-  "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-  "cases": [
-    {
-      "case": [
-        "--profile",
-        "baseline",
-        "--backend",
-        "vulkan"
-      ],
-      "exit_code": 1,
-      "failure": [
-        {
-          "exit_code": 1,
-          "result_count": 0,
-          "java_exception_types": [
-            "java.lang.AssertionError",
-            "java.lang.RuntimeException"
-          ],
-          "expected_demo_authentication_errors_observed": true,
-          "backend_attempts": [
-            {
-              "backend": "Vulkan",
-              "operation": "load_library",
-              "result": "success"
-            },
-            {
-              "backend": "Vulkan",
-              "operation": "create_device",
-              "result": "success"
-            }
-          ],
-          "created_devices": [
-            {
-              "gpu": "Apple Paravirtual device",
-              "graphics_backend": "Vulkan",
-              "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-            }
-          ],
-          "client_initializer_reached": true,
-          "readback_requested": true,
-          "vulkan_error_codes": [
-            "VK_ERROR_FEATURE_NOT_PRESENT"
-          ],
-          "fatal_jvm_error": false,
-          "profile": "baseline",
-          "preferred_backend": "vulkan"
-        }
-      ]
-    },
-    {
-      "case": [
-        "--profile",
-        "core-performance",
-        "--backend",
-        "vulkan"
-      ],
-      "exit_code": 1,
-      "failure": [
-        {
-          "exit_code": 1,
-          "result_count": 0,
-          "java_exception_types": [
-            "java.lang.AssertionError",
-            "java.lang.RuntimeException"
-          ],
-          "expected_demo_authentication_errors_observed": true,
-          "backend_attempts": [
-            {
-              "backend": "Vulkan",
-              "operation": "load_library",
-              "result": "success"
-            },
-            {
-              "backend": "Vulkan",
-              "operation": "create_device",
-              "result": "success"
-            }
-          ],
-          "created_devices": [
-            {
-              "gpu": "Apple Paravirtual device",
-              "graphics_backend": "Vulkan",
-              "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-            }
-          ],
-          "client_initializer_reached": true,
-          "readback_requested": true,
-          "vulkan_error_codes": [
-            "VK_ERROR_FEATURE_NOT_PRESENT"
-          ],
-          "fatal_jvm_error": false,
-          "profile": "core-performance",
-          "preferred_backend": "vulkan"
-        }
-      ]
-    },
-    {
-      "case": [
-        "--profile",
-        "vulkan"
-      ],
-      "exit_code": 1,
-      "failure": [
-        {
-          "exit_code": 1,
-          "result_count": 0,
-          "java_exception_types": [
-            "java.lang.AssertionError",
-            "java.lang.RuntimeException"
-          ],
-          "expected_demo_authentication_errors_observed": true,
-          "backend_attempts": [
-            {
-              "backend": "Vulkan",
-              "operation": "load_library",
-              "result": "success"
-            },
-            {
-              "backend": "Vulkan",
-              "operation": "create_device",
-              "result": "success"
-            }
-          ],
-          "created_devices": [
-            {
-              "gpu": "Apple Paravirtual device",
-              "graphics_backend": "Vulkan",
-              "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-            }
-          ],
-          "client_initializer_reached": true,
-          "readback_requested": true,
-          "vulkan_error_codes": [
-            "VK_ERROR_FEATURE_NOT_PRESENT"
-          ],
-          "fatal_jvm_error": false,
-          "profile": "vulkan",
-          "preferred_backend": "vulkan"
-        }
-      ]
-    }
-  ],
-  "limits": [
-    "Apple Paravirtual device and MoltenVK on a hosted ARM Mac; not physical M2 Pro GPU testing.",
-    "Library/device creation and readback request were observed, but no completed nonuniform readback report was produced.",
-    "All failures retained; neither successful rendering nor a screenshot-specific root cause is established.",
-    "Baseline includes the same original measurement mod and private test fixture; no core optimization mods or distant terrain.",
-    "Full logs, screenshots, game binaries and assets remain private.",
-    "Later selected stack locations place the observed failures in the screenshot callback; the independently logged Vulkan identifier is not established as their cause.",
-    "Actual assertions rejected uniform callback images in all three cases. Overlay state was not recorded, and displayed-window correctness is not established.",
-    "After guarding overlays, core/distant-terrain title readbacks pass but vanilla remains uniform; the aggregate research run fails. No world-rendering or physical-M2 claim.",
-    "Later world probes pass all three Vulkan cases on the hosted Mac; failed title cases remain retained. These are short startup/readback/save probes, not physical-GPU performance tests."
-  ],
-  "later_stack_run": {
-    "source_commit": "a77476b54e7bf4a1b3a96cb9d8108ed7c1c7b2b0",
-    "run_url": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37193954843",
-    "cases": [
-      {
-        "case": [
-          "--profile",
-          "baseline",
-          "--backend",
-          "vulkan"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": 1,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.AssertionError",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": true,
-            "vulkan_error_codes": [
-              "VK_ERROR_FEATURE_NOT_PRESENT"
-            ],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-              "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-              "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-              "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-            ],
-            "profile": "baseline",
-            "preferred_backend": "vulkan"
-          }
-        ]
-      },
-      {
-        "case": [
-          "--profile",
-          "core-performance",
-          "--backend",
-          "vulkan"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": 1,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.AssertionError",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": true,
-            "vulkan_error_codes": [
-              "VK_ERROR_FEATURE_NOT_PRESENT"
-            ],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-              "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-              "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-              "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-            ],
-            "profile": "core-performance",
-            "preferred_backend": "vulkan"
-          }
-        ]
-      },
-      {
-        "case": [
-          "--profile",
-          "vulkan"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": 1,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.AssertionError",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": true,
-            "vulkan_error_codes": [
-              "VK_ERROR_FEATURE_NOT_PRESENT"
-            ],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-              "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-              "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-              "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-            ],
-            "profile": "vulkan",
-            "preferred_backend": "vulkan"
-          }
-        ]
-      }
-    ]
-  },
-  "later_pixel_run": {
-    "source_commit": "213498c77ed643617083dacf4aaa283a1cb4815a",
-    "run_url": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37194354615",
-    "cases": [
-      {
-        "case": [
-          "--profile",
-          "baseline",
-          "--backend",
-          "vulkan"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": 1,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.AssertionError",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": true,
-            "readback_callback_received": true,
-            "readback_inspections": [
-              {
-                "framebuffer_width": 1280,
-                "framebuffer_height": 646,
-                "sampled_pixels": 4160,
-                "distinct_sampled_rgb": 1
-              }
-            ],
-            "probe_failure_categories": [
-              "uniform_readback"
-            ],
-            "vulkan_error_codes": [
-              "VK_ERROR_FEATURE_NOT_PRESENT"
-            ],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-              "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-              "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-              "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-            ],
-            "profile": "baseline",
-            "preferred_backend": "vulkan"
-          }
-        ]
-      },
-      {
-        "case": [
-          "--profile",
-          "core-performance",
-          "--backend",
-          "vulkan"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": 1,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.AssertionError",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": true,
-            "readback_callback_received": true,
-            "readback_inspections": [
-              {
-                "framebuffer_width": 1280,
-                "framebuffer_height": 646,
-                "sampled_pixels": 4160,
-                "distinct_sampled_rgb": 1
-              }
-            ],
-            "probe_failure_categories": [
-              "uniform_readback"
-            ],
-            "vulkan_error_codes": [
-              "VK_ERROR_FEATURE_NOT_PRESENT"
-            ],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-              "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-              "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-              "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-            ],
-            "profile": "core-performance",
-            "preferred_backend": "vulkan"
-          }
-        ]
-      },
-      {
-        "case": [
-          "--profile",
-          "vulkan"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": 1,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.AssertionError",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": true,
-            "readback_callback_received": true,
-            "readback_inspections": [
-              {
-                "framebuffer_width": 1280,
-                "framebuffer_height": 646,
-                "sampled_pixels": 4160,
-                "distinct_sampled_rgb": 1
-              }
-            ],
-            "probe_failure_categories": [
-              "uniform_readback"
-            ],
-            "vulkan_error_codes": [
-              "VK_ERROR_FEATURE_NOT_PRESENT"
-            ],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-              "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-              "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-              "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-            ],
-            "profile": "vulkan",
-            "preferred_backend": "vulkan"
-          }
-        ]
-      }
-    ]
-  },
-  "later_overlay_run": {
-    "source_commit": "a1d8c1b8246008ac4076cdcaf0f64c71eaf4c767",
-    "run_url": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37194690645",
-    "cases": [
-      {
-        "case": [
-          "--profile",
-          "baseline",
-          "--backend",
-          "vulkan"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": 1,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.AssertionError",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": true,
-            "readback_callback_received": true,
-            "readback_inspections": [
-              {
-                "framebuffer_width": 1280,
-                "framebuffer_height": 646,
-                "sampled_pixels": 4160,
-                "distinct_sampled_rgb": 1
-              }
-            ],
-            "probe_failure_categories": [
-              "uniform_readback"
-            ],
-            "vulkan_error_codes": [
-              "VK_ERROR_FEATURE_NOT_PRESENT"
-            ],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-              "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-              "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-              "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-            ],
-            "profile": "baseline",
-            "preferred_backend": "vulkan"
-          }
-        ]
-      },
-      {
-        "case": [
-          "--profile",
-          "core-performance",
-          "--backend",
-          "vulkan"
-        ],
-        "exit_code": 0,
-        "report": {
-          "schema": 1,
-          "platform": "macOS-26.6.2-arm64-arm-64bit",
-          "architecture": "arm64",
-          "minecraft": "26.3",
-          "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-          "results": [
-            {
-              "observed_mode": "title",
-              "title_screen_observed": true,
-              "world_loaded": false,
-              "ready_client_ticks": 42,
-              "window_active": true,
-              "overlay_present": false,
-              "overlay_wait_ticks": 105,
-              "framebuffer_width": 1280,
-              "framebuffer_height": 646,
-              "sampled_pixels": 4160,
-              "distinct_sampled_rgb": 163,
-              "gpu": "Apple Paravirtual device",
-              "graphics_backend": "Vulkan",
-              "graphics_driver": "1.2.350 MoltenVK 1.4.2",
-              "private_png_sha256": "3c802923766cf9e7f45020bc2d858c23de655cb8e35fa058a050e7b09a1d3708",
-              "profile": "core-performance",
-              "preferred_backend": "vulkan",
-              "launcher_exit_code": 0,
-              "backend_attempts": [
-                {
-                  "backend": "Vulkan",
-                  "operation": "load_library",
-                  "result": "success"
-                },
-                {
-                  "backend": "Vulkan",
-                  "operation": "create_device",
-                  "result": "success"
-                }
-              ]
-            }
-          ],
-          "limits": [
-            "Short scene startup and nonuniform framebuffer readback only.",
-            "World mode uses the ordinary limited demo; world files remain private.",
-            "No exhaustive gameplay, visual-correctness, FPS or M2 Pro performance claim.",
-            "Vulkan preference can fall back; inspect the observed backend.",
-            "PNG images, assets and full logs remain in the private runtime directory."
-          ]
-        }
-      },
-      {
-        "case": [
-          "--profile",
-          "vulkan"
-        ],
-        "exit_code": 0,
-        "report": {
-          "schema": 1,
-          "platform": "macOS-26.6.2-arm64-arm-64bit",
-          "architecture": "arm64",
-          "minecraft": "26.3",
-          "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-          "results": [
-            {
-              "observed_mode": "title",
-              "title_screen_observed": true,
-              "world_loaded": false,
-              "ready_client_ticks": 42,
-              "window_active": true,
-              "overlay_present": false,
-              "overlay_wait_ticks": 122,
-              "framebuffer_width": 1280,
-              "framebuffer_height": 646,
-              "sampled_pixels": 4160,
-              "distinct_sampled_rgb": 163,
-              "gpu": "Apple Paravirtual device",
-              "graphics_backend": "Vulkan",
-              "graphics_driver": "1.2.350 MoltenVK 1.4.2",
-              "private_png_sha256": "3c802923766cf9e7f45020bc2d858c23de655cb8e35fa058a050e7b09a1d3708",
-              "profile": "vulkan",
-              "preferred_backend": "vulkan",
-              "launcher_exit_code": 0,
-              "backend_attempts": [
-                {
-                  "backend": "Vulkan",
-                  "operation": "load_library",
-                  "result": "success"
-                },
-                {
-                  "backend": "Vulkan",
-                  "operation": "create_device",
-                  "result": "success"
-                }
-              ]
-            }
-          ],
-          "limits": [
-            "Short scene startup and nonuniform framebuffer readback only.",
-            "World mode uses the ordinary limited demo; world files remain private.",
-            "No exhaustive gameplay, visual-correctness, FPS or M2 Pro performance claim.",
-            "Vulkan preference can fall back; inspect the observed backend.",
-            "PNG images, assets and full logs remain in the private runtime directory."
-          ]
-        }
-      }
-    ]
-  },
-  "later_world_run": {
-    "source_commit": "5f9f973295c5cc948a6999a849c2c843f5e831f6",
-    "run_url": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37195149166",
-    "cases": [
-      {
-        "case": [
-          "--profile",
-          "baseline",
-          "--backend",
-          "vulkan",
-          "--world"
-        ],
-        "exit_code": 0,
-        "report": {
-          "schema": 1,
-          "platform": "macOS-26.6.2-arm64-arm-64bit",
-          "architecture": "arm64",
-          "minecraft": "26.3",
-          "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-          "results": [
-            {
-              "observed_mode": "world",
-              "title_screen_observed": false,
-              "world_loaded": true,
-              "ready_client_ticks": 42,
-              "window_active": true,
-              "overlay_present": false,
-              "overlay_wait_ticks": 323,
-              "framebuffer_width": 1280,
-              "framebuffer_height": 646,
-              "sampled_pixels": 4160,
-              "distinct_sampled_rgb": 1278,
-              "gpu": "Apple Paravirtual device",
-              "graphics_backend": "Vulkan",
-              "graphics_driver": "1.2.350 MoltenVK 1.4.2",
-              "private_png_sha256": "9e9be2562390f24fe8c8e0442ef9cdfd47910febd95d8f0c0f5706191a53f1f6",
-              "profile": "baseline",
-              "preferred_backend": "vulkan",
-              "launcher_exit_code": 0,
-              "backend_attempts": [
-                {
-                  "backend": "Vulkan",
-                  "operation": "load_library",
-                  "result": "success"
-                },
-                {
-                  "backend": "Vulkan",
-                  "operation": "create_device",
-                  "result": "success"
-                }
-              ]
-            }
-          ],
-          "limits": [
-            "Short scene startup and nonuniform framebuffer readback only.",
-            "World mode uses the ordinary limited demo; world files remain private.",
-            "No exhaustive gameplay, visual-correctness, FPS or M2 Pro performance claim.",
-            "Vulkan preference can fall back; inspect the observed backend.",
-            "PNG images, assets and full logs remain in the private runtime directory."
-          ]
-        }
-      },
-      {
-        "case": [
-          "--profile",
-          "core-performance",
-          "--backend",
-          "vulkan",
-          "--world"
-        ],
-        "exit_code": 0,
-        "report": {
-          "schema": 1,
-          "platform": "macOS-26.6.2-arm64-arm-64bit",
-          "architecture": "arm64",
-          "minecraft": "26.3",
-          "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-          "results": [
-            {
-              "observed_mode": "world",
-              "title_screen_observed": false,
-              "world_loaded": true,
-              "ready_client_ticks": 51,
-              "window_active": true,
-              "overlay_present": false,
-              "overlay_wait_ticks": 90,
-              "framebuffer_width": 1280,
-              "framebuffer_height": 646,
-              "sampled_pixels": 4160,
-              "distinct_sampled_rgb": 1024,
-              "gpu": "Apple Paravirtual device",
-              "graphics_backend": "Vulkan",
-              "graphics_driver": "1.2.350 MoltenVK 1.4.2",
-              "private_png_sha256": "e0a6ad253ca0490b35217ce9ad799dc7d4c04e4ecf446eeacd1aa5196db317bb",
-              "profile": "core-performance",
-              "preferred_backend": "vulkan",
-              "launcher_exit_code": 0,
-              "backend_attempts": [
-                {
-                  "backend": "Vulkan",
-                  "operation": "load_library",
-                  "result": "success"
-                },
-                {
-                  "backend": "Vulkan",
-                  "operation": "create_device",
-                  "result": "success"
-                }
-              ]
-            }
-          ],
-          "limits": [
-            "Short scene startup and nonuniform framebuffer readback only.",
-            "World mode uses the ordinary limited demo; world files remain private.",
-            "No exhaustive gameplay, visual-correctness, FPS or M2 Pro performance claim.",
-            "Vulkan preference can fall back; inspect the observed backend.",
-            "PNG images, assets and full logs remain in the private runtime directory."
-          ]
-        }
-      },
-      {
-        "case": [
-          "--profile",
-          "vulkan",
-          "--world"
-        ],
-        "exit_code": 0,
-        "report": {
-          "schema": 1,
-          "platform": "macOS-26.6.2-arm64-arm-64bit",
-          "architecture": "arm64",
-          "minecraft": "26.3",
-          "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-          "results": [
-            {
-              "observed_mode": "world",
-              "title_screen_observed": false,
-              "world_loaded": true,
-              "ready_client_ticks": 53,
-              "window_active": true,
-              "overlay_present": false,
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-                  "backend": "Vulkan",
-                  "operation": "create_device",
-                  "result": "success"
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-          "limits": [
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-            "World mode uses the ordinary limited demo; world files remain private.",
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-            "PNG images, assets and full logs remain in the private runtime directory."
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-    "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-    "architecture": "x86_64",
-    "minecraft": "26.3",
-    "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
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-        "ready_client_ticks": 47,
-        "window_active": true,
-        "overlay_present": false,
-        "overlay_wait_ticks": 111,
-        "framebuffer_width": 1280,
-        "framebuffer_height": 800,
-        "sampled_pixels": 4288,
-        "distinct_sampled_rgb": 1895,
-        "gpu": "llvmpipe (LLVM 21.1.8, 256 bits)",
-        "graphics_backend": "Vulkan",
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-        "backend_attempts": [
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-            "operation": "load_library",
-            "result": "success"
-          },
-          {
-            "backend": "Vulkan",
-            "operation": "create_device",
-            "result": "success"
-          }
-        ]
-      }
-    ],
-    "limits": [
-      "Short scene startup and nonuniform framebuffer readback only.",
-      "World mode uses the ordinary limited demo; world files remain private.",
-      "No exhaustive gameplay, visual-correctness, FPS or M2 Pro performance claim.",
-      "Vulkan preference can fall back; inspect the observed backend.",
-      "PNG images, assets and full logs remain in the private runtime directory."
-    ]
-  }
-}

benchmarks/object-headers-2026-10-03/macos-26.txt

@@ -1,104 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Darwin 25.6.0 arm64; logical CPUs 3
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-type=Object objects=100000 allocated_bytes=800000 bytes_per_object=8.000

benchmarks/object-headers-2026-10-03/ubuntu-latest.txt

@@ -1,104 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Linux 6.17.0-1022-azure x86_64; logical CPUs 4
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benchmarks/object-headers-2026-10-03/windows-latest.txt

@@ -1,104 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
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-type=Object objects=100000 allocated_bytes=1600000 bytes_per_object=16.000
-fork=2 requested_compact_headers=True
-compact_object_headers=true
-type=AABB objects=100000 allocated_bytes=5600000 bytes_per_object=56.000
-type=AABB objects=100000 allocated_bytes=5600000 bytes_per_object=56.000
-type=AABB objects=100000 allocated_bytes=5600000 bytes_per_object=56.000
-type=Vec3 objects=100000 allocated_bytes=3200000 bytes_per_object=32.000
-type=Vec3 objects=100000 allocated_bytes=3200000 bytes_per_object=32.000
-type=Vec3 objects=100000 allocated_bytes=3200000 bytes_per_object=32.000
-type=DhChunkPos objects=100000 allocated_bytes=2400000 bytes_per_object=24.000
-type=DhChunkPos objects=100000 allocated_bytes=2400000 bytes_per_object=24.000
-type=DhChunkPos objects=100000 allocated_bytes=2400000 bytes_per_object=24.000
-type=Long objects=100000 allocated_bytes=1600000 bytes_per_object=16.000
-type=Long objects=100000 allocated_bytes=1600000 bytes_per_object=16.000
-type=Long objects=100000 allocated_bytes=1600000 bytes_per_object=16.000
-type=Object objects=100000 allocated_bytes=800000 bytes_per_object=8.000
-type=Object objects=100000 allocated_bytes=800000 bytes_per_object=8.000
-type=Object objects=100000 allocated_bytes=800000 bytes_per_object=8.000

benchmarks/quad-reuse-2026-10-04/exploratory-observations.json

@@ -1,67 +0,0 @@
-{
-  "schema": 1,
-  "purpose": "Earlier private quad-reuse explorations; CPU mixed and allocation reduction is not retained RAM/FPS",
-  "original_mod_sha256": "98f8db7ca8962a71625eef835f57d25c8afb802f2cf1b7c4c832fc070757e011",
-  "private_fixture_sources": "Uncommitted private prototype before the production-hook fixture; not the final reproducible protocol",
-  "observations": [
-    {
-      "private_probe": "latest-discarded-object",
-      "results": [
-        {
-          "enabled": false,
-          "applied_hook_checked": true,
-          "geometry_digest": "31509677879305c6a721677b38516fda0336f8c7b53dc3946839eb6fbf7fd0ee",
-          "geometry_quads": 108358,
-          "input_faces": 55296,
-          "measured_faces": 3072000,
-          "checksum": 60000,
-          "cpu_ns": 166481448,
-          "allocated_bytes": 144576000,
-          "observations": [
-            {
-              "cpu_ns": 54349387,
-              "allocated_bytes": 48192000
-            },
-            {
-              "cpu_ns": 84133914,
-              "allocated_bytes": 48192000
-            },
-            {
-              "cpu_ns": 27998147,
-              "allocated_bytes": 48192000
-            }
-          ]
-        },
-        {
-          "enabled": true,
-          "applied_hook_checked": true,
-          "geometry_digest": "31509677879305c6a721677b38516fda0336f8c7b53dc3946839eb6fbf7fd0ee",
-          "geometry_quads": 108358,
-          "input_faces": 55296,
-          "measured_faces": 3072000,
-          "checksum": 60000,
-          "cpu_ns": 185505067,
-          "allocated_bytes": 2016000,
-          "observations": [
-            {
-              "cpu_ns": 59897923,
-              "allocated_bytes": 672000
-            },
-            {
-              "cpu_ns": 63778316,
-              "allocated_bytes": 672000
-            },
-            {
-              "cpu_ns": 61828828,
-              "allocated_bytes": 672000
-            }
-          ]
-        }
-      ]
-    },
-    {
-      "private_probe": "first-discarded-object",
-      "results": []
-    }
-  ]
-}

benchmarks/quad-reuse-2026-10-04/linux-applied-hooks.json

@@ -1,75 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-6.17.0-1022-azure-x86_64-with-glibc2.39",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "2196637c5b2180a33fa5b926ab51069ab480618c1186b8a02872c7e758be0a70",
-  "results": [
-    {
-      "enabled": false,
-      "applied_hook_checked": true,
-      "geometry_digest": "8251175aa3e3cac30bb1366f8b40d0576c17978076ea7d244ff4d7cc361da7ee",
-      "thread_geometry_digest": "096a85be06031d248f12e536e19e5c0496bb00c80f3387f670a0fae29438a732",
-      "thread_workers": 4,
-      "geometry_quads": 108358,
-      "input_faces": 55296,
-      "measured_faces": 3072000,
-      "checksum": 60000,
-      "cpu_ns": 40437624,
-      "allocated_bytes": 144576000,
-      "observations": [
-        {
-          "cpu_ns": 13455029,
-          "allocated_bytes": 48192000
-        },
-        {
-          "cpu_ns": 13828075,
-          "allocated_bytes": 48192000
-        },
-        {
-          "cpu_ns": 13154520,
-          "allocated_bytes": 48192000
-        }
-      ]
-    },
-    {
-      "enabled": true,
-      "applied_hook_checked": true,
-      "geometry_digest": "8251175aa3e3cac30bb1366f8b40d0576c17978076ea7d244ff4d7cc361da7ee",
-      "thread_geometry_digest": "096a85be06031d248f12e536e19e5c0496bb00c80f3387f670a0fae29438a732",
-      "thread_workers": 4,
-      "geometry_quads": 108358,
-      "input_faces": 55296,
-      "measured_faces": 3072000,
-      "checksum": 60000,
-      "cpu_ns": 44074799,
-      "allocated_bytes": 2016000,
-      "observations": [
-        {
-          "cpu_ns": 16004752,
-          "allocated_bytes": 672000
-        },
-        {
-          "cpu_ns": 14047833,
-          "allocated_bytes": 672000
-        },
-        {
-          "cpu_ns": 14022214,
-          "allocated_bytes": 672000
-        }
-      ]
-    }
-  ],
-  "notes": [
-    "Actual publisher quad builder inside Fabric with generated faces and lighting/material values.",
-    "Opaque/translucent geometry, pooled error flags and every retained quad field match before and after upstream merging.",
-    "Fresh allocations reuse at most one discarded successful-premerge quad; existing pool selection stays upstream.",
-    "Three sequential warmed caller-loop observations are not independent forks; compilation can vary.",
-    "Allocation reduction is not retained RAM, game FPS or a Mac GPU benchmark."
-  ],
-  "provenance": {
-    "source_commit": "0a0cd667d5cfdee7c59f5fe2c7a2eb15bd19e66e",
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37175709062"
-  }
-}

benchmarks/quad-reuse-2026-10-04/live-observations.json

@@ -1,166 +0,0 @@
-{
-  "schema": 1,
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "2196637c5b2180a33fa5b926ab51069ab480618c1186b8a02872c7e758be0a70",
-  "platform": "Linux x86_64",
-  "graphics": "llvmpipe software OpenGL",
-  "settings": {
-    "heap_bytes": 3221225472,
-    "gc": "G1",
-    "compact_headers": true,
-    "render_distance": 12,
-    "simulation_distance": 12,
-    "lod_radius_chunks": 128,
-    "lod_quality": "MEDIUM/MEDIUM/BLOCK",
-    "terrain_workers": 2,
-    "runtime_ratio": 0.5,
-    "world_difficulty": "PEACEFUL"
-  },
-  "results": [
-    {
-      "profile": "m2-balanced",
-      "quad_reuse_enabled": false,
-      "elapsed_seconds": 120.415309971,
-      "frame_samples": 220,
-      "tick_samples": 2400,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "visual_settings_changed": [],
-      "frame_stats": {
-        "count": 220,
-        "meanMs": 542.3438610045455,
-        "p50Ms": 522.365908,
-        "p95Ms": 713.237831,
-        "p99Ms": 860.91664,
-        "maxMs": 885.115974,
-        "meanRate": 1.8438486574693962,
-        "lowOnePercentRate": 1.1446485854821962,
-        "over16Ms": 220,
-        "over33Ms": 220,
-        "over50Ms": 220,
-        "over100Ms": 220
-      },
-      "tick_stats": {
-        "count": 2400,
-        "meanMs": 9.639125558749999,
-        "p50Ms": 9.137695,
-        "p95Ms": 16.989389,
-        "p99Ms": 25.152306,
-        "maxMs": 52.879001,
-        "meanRate": 103.74385040479541,
-        "lowOnePercentRate": 30.37834831626593,
-        "over16Ms": 133,
-        "over33Ms": 8,
-        "over50Ms": 2,
-        "over100Ms": 0
-      },
-      "process_rss_peak_sampled_bytes": 3129790464,
-      "render_loader_allocation_counters": [
-        {
-          "thread_id": 124,
-          "thread": "DH-Render Loader Thread[1]",
-          "counter_observations": 2,
-          "observed_seconds": 64.375191422,
-          "observed_allocated_bytes": 97869576,
-          "observed_bytes_per_second": 1520299.5725237317
-        },
-        {
-          "thread_id": 123,
-          "thread": "DH-Render Loader Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.375191422,
-          "observed_allocated_bytes": 91443128,
-          "observed_bytes_per_second": 1420471.5509203072
-        }
-      ],
-      "preceding_jfr_gc_pause_total_ms": 263.975028,
-      "preceding_jfr_gc_pause_longest_ms": 45.0698
-    },
-    {
-      "profile": "quad-reuse",
-      "quad_reuse_enabled": true,
-      "elapsed_seconds": 120.476138714,
-      "frame_samples": 224,
-      "tick_samples": 2401,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "visual_settings_changed": [],
-      "frame_stats": {
-        "count": 224,
-        "meanMs": 532.6331643258928,
-        "p50Ms": 505.6209,
-        "p95Ms": 735.235244,
-        "p99Ms": 774.189261,
-        "maxMs": 926.006251,
-        "meanRate": 1.8774647674551252,
-        "lowOnePercentRate": 1.208934822852848,
-        "over16Ms": 224,
-        "over33Ms": 224,
-        "over50Ms": 224,
-        "over100Ms": 224
-      },
-      "tick_stats": {
-        "count": 2401,
-        "meanMs": 9.308558193669304,
-        "p50Ms": 8.82277,
-        "p95Ms": 16.529268,
-        "p99Ms": 22.206144,
-        "maxMs": 95.741877,
-        "meanRate": 107.42802259968617,
-        "lowOnePercentRate": 30.32324112917506,
-        "over16Ms": 114,
-        "over33Ms": 8,
-        "over50Ms": 3,
-        "over100Ms": 0
-      },
-      "process_rss_peak_sampled_bytes": 3100016640,
-      "render_loader_allocation_counters": [
-        {
-          "thread_id": 125,
-          "thread": "DH-Render Loader Thread[1]",
-          "counter_observations": 2,
-          "observed_seconds": 64.347664971,
-          "observed_allocated_bytes": 116155920,
-          "observed_bytes_per_second": 1805130.3035214841
-        },
-        {
-          "thread_id": 124,
-          "thread": "DH-Render Loader Thread[0]",
-          "counter_observations": 2,
-          "observed_seconds": 64.347664971,
-          "observed_allocated_bytes": 104401656,
-          "observed_bytes_per_second": 1622462.229935638
-        }
-      ],
-      "preceding_jfr_gc_pause_total_ms": 166.770211,
-      "preceding_jfr_gc_pause_longest_ms": 46.786101
-    }
-  ],
-  "provenance": {
-    "source_commit": "0a0cd667d5cfdee7c59f5fe2c7a2eb15bd19e66e",
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37175709062",
-    "runtime_mod_matches_linux_ci": true,
-    "initial_player_snapshot_sha256": "b4d11dbd6443625415a1e32aa242d0e2d09cd77ddb1becfde5d35cb6ab8d278a",
-    "source_level_snapshot_sha256": "86a3c75ea993e50c4428da4dbadc5856688a9367f035c41b8bb49863a9aeb644",
-    "first_saved_player_position": [
-      -56.5,
-      69.0,
-      55.5
-    ],
-    "first_saved_player_rotation": [
-      141.5,
-      16.950002670288086
-    ],
-    "first_saved_cameras_matched": true
-  },
-  "notes": [
-    "Fixed-order candidate then control single pair from separate copies of the same private world. Both stationary captures start approximately 307 seconds after the demo popup is dismissed; first saved cameras match.",
-    "Both reports have zero menu/pause/focus exclusions, no dropped samples and matching captured settings apart from the isolated quad hook. CSV counts and actual offline viewer timelines pass.",
-    "The preceding 60-second JFR recordings begin approximately 121 seconds after dismissal. Allocation counters have their own approximately 64-second spans; GC pause data is from those recordings, not from the later frame captures.",
-    "Render-loader allocation counter rates are higher in this candidate observation. Task-completion/geometry volumes and cache/JIT effects are not controlled quantitatively. No useful live allocation improvement is established.",
-    "Frame count and sampled peak RSS differences in this single software-rendered pair do not establish a meaningful game speed or retained-memory gain. RSS is not complete GPU/unified RAM. Not an Apple Silicon benchmark.",
-    "Candidate saved, reloaded, saved again and exited with launcher code zero. Control saved, closed all terrain databases and exited with launcher code zero.",
-    "No private worlds, full game logs or JFR recordings are included in these selected observations."
-  ]
-}

benchmarks/quad-reuse-2026-10-04/local-applied-hooks.json

@@ -1,75 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "2196637c5b2180a33fa5b926ab51069ab480618c1186b8a02872c7e758be0a70",
-  "results": [
-    {
-      "enabled": false,
-      "applied_hook_checked": true,
-      "geometry_digest": "8251175aa3e3cac30bb1366f8b40d0576c17978076ea7d244ff4d7cc361da7ee",
-      "thread_geometry_digest": "096a85be06031d248f12e536e19e5c0496bb00c80f3387f670a0fae29438a732",
-      "thread_workers": 4,
-      "geometry_quads": 108358,
-      "input_faces": 55296,
-      "measured_faces": 3072000,
-      "checksum": 60000,
-      "cpu_ns": 198847198,
-      "allocated_bytes": 144576000,
-      "observations": [
-        {
-          "cpu_ns": 82119774,
-          "allocated_bytes": 48192000
-        },
-        {
-          "cpu_ns": 60671068,
-          "allocated_bytes": 48192000
-        },
-        {
-          "cpu_ns": 56056356,
-          "allocated_bytes": 48192000
-        }
-      ]
-    },
-    {
-      "enabled": true,
-      "applied_hook_checked": true,
-      "geometry_digest": "8251175aa3e3cac30bb1366f8b40d0576c17978076ea7d244ff4d7cc361da7ee",
-      "thread_geometry_digest": "096a85be06031d248f12e536e19e5c0496bb00c80f3387f670a0fae29438a732",
-      "thread_workers": 4,
-      "geometry_quads": 108358,
-      "input_faces": 55296,
-      "measured_faces": 3072000,
-      "checksum": 60000,
-      "cpu_ns": 178894413,
-      "allocated_bytes": 2016000,
-      "observations": [
-        {
-          "cpu_ns": 60070905,
-          "allocated_bytes": 672000
-        },
-        {
-          "cpu_ns": 60020252,
-          "allocated_bytes": 672000
-        },
-        {
-          "cpu_ns": 58803256,
-          "allocated_bytes": 672000
-        }
-      ]
-    }
-  ],
-  "notes": [
-    "Actual publisher quad builder inside Fabric with generated faces and lighting/material values.",
-    "Opaque/translucent geometry, pooled error flags and every retained quad field match before and after upstream merging.",
-    "Fresh allocations reuse at most one discarded successful-premerge quad; existing pool selection stays upstream.",
-    "Three sequential warmed caller-loop observations are not independent forks; compilation can vary.",
-    "Allocation reduction is not retained RAM, game FPS or a Mac GPU benchmark."
-  ],
-  "provenance": {
-    "source_commit": "0a0cd667d5cfdee7c59f5fe2c7a2eb15bd19e66e",
-    "fixture_protocol": "55,296 generated faces plus four concurrent builders, geometry/list boundaries checked before and after upstream merge; warm 2,000 batches, then 500 warm batches and 2,000 measured batches per sequential observation, 512 faces/batch"
-  }
-}

benchmarks/quad-reuse-2026-10-04/local-shallow-size-applied.json

@@ -1,87 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "2196637c5b2180a33fa5b926ab51069ab480618c1186b8a02872c7e758be0a70",
-  "results": [
-    {
-      "enabled": false,
-      "compact_headers": false,
-      "builder_shallow_bytes": 48,
-      "quad_shallow_bytes": 56,
-      "pending_scratch_shallow_bytes": 0,
-      "geometry_quads": 1,
-      "java_vendor": "Ubuntu",
-      "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-      "object_alignment_bytes": 8,
-      "compressed_oops": true,
-      "compressed_class_pointers": true
-    },
-    {
-      "enabled": true,
-      "compact_headers": false,
-      "builder_shallow_bytes": 48,
-      "quad_shallow_bytes": 56,
-      "pending_scratch_shallow_bytes": 56,
-      "geometry_quads": 1,
-      "java_vendor": "Ubuntu",
-      "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-      "object_alignment_bytes": 8,
-      "compressed_oops": true,
-      "compressed_class_pointers": true
-    },
-    {
-      "enabled": false,
-      "compact_headers": true,
-      "builder_shallow_bytes": 40,
-      "quad_shallow_bytes": 48,
-      "pending_scratch_shallow_bytes": 0,
-      "geometry_quads": 1,
-      "java_vendor": "Ubuntu",
-      "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-      "object_alignment_bytes": 8,
-      "compressed_oops": true,
-      "compressed_class_pointers": true
-    },
-    {
-      "enabled": true,
-      "compact_headers": true,
-      "builder_shallow_bytes": 48,
-      "quad_shallow_bytes": 48,
-      "pending_scratch_shallow_bytes": 48,
-      "geometry_quads": 1,
-      "java_vendor": "Ubuntu",
-      "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-      "object_alignment_bytes": 8,
-      "compressed_oops": true,
-      "compressed_class_pointers": true
-    }
-  ],
-  "differences": [
-    {
-      "compact_headers": false,
-      "additional_builder_shallow_bytes": 0,
-      "additional_builder_and_scratch_bytes": 56
-    },
-    {
-      "compact_headers": true,
-      "additional_builder_shallow_bytes": 8,
-      "additional_builder_and_scratch_bytes": 56
-    }
-  ],
-  "notes": [
-    "Instrumentation.getObjectSize measures shallow object sizes inside real applied Fabric clients.",
-    "Four adjacent north-facing quads premerge to one retained geometry quad in each combination.",
-    "Builder plus pending scratch difference excludes referenced lists, existing pools and every other game object.",
-    "Object alignment/header/compressed-reference settings can differ on other JVMs or architectures.",
-    "Not deep heap, GC residency, whole-game RSS/unified RAM, FPS or Apple Silicon performance.",
-    "The agent and fixture are private test binaries excluded from playable packs."
-  ],
-  "provenance": {
-    "source_commit": "1243e148d455cd83f18b66f70bcfe2b8a4b746c9",
-    "four_processes_exited_successfully": true,
-    "agent_path_with_spaces_verified_separately": true
-  }
-}

benchmarks/quad-reuse-2026-10-04/shallow-size-observations.json

@@ -1,69 +0,0 @@
-{
-  "schema": 1,
-  "measurement": "Instrumentation.getObjectSize inside four private applied Fabric clients",
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-  "architecture": "x86_64",
-  "java_vendor": "Ubuntu",
-  "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-  "original_mod_sha256": "2196637c5b2180a33fa5b926ab51069ab480618c1186b8a02872c7e758be0a70",
-  "production_source_commit": "24c65f512dece83b153b206e33cd4c4294b42de2",
-  "results": [
-    {
-      "enabled": false,
-      "compact_headers": false,
-      "builder_shallow_bytes": 48,
-      "quad_shallow_bytes": 56,
-      "pending_scratch_shallow_bytes": 0,
-      "geometry_quads": 1
-    },
-    {
-      "enabled": true,
-      "compact_headers": false,
-      "builder_shallow_bytes": 48,
-      "quad_shallow_bytes": 56,
-      "pending_scratch_shallow_bytes": 56,
-      "geometry_quads": 1
-    },
-    {
-      "enabled": false,
-      "compact_headers": true,
-      "builder_shallow_bytes": 40,
-      "quad_shallow_bytes": 48,
-      "pending_scratch_shallow_bytes": 0,
-      "geometry_quads": 1
-    },
-    {
-      "enabled": true,
-      "compact_headers": true,
-      "builder_shallow_bytes": 48,
-      "quad_shallow_bytes": 48,
-      "pending_scratch_shallow_bytes": 48,
-      "geometry_quads": 1
-    }
-  ],
-  "differences": [
-    {
-      "compact_headers": false,
-      "additional_builder_shallow_bytes": 0,
-      "additional_builder_and_scratch_bytes": 56
-    },
-    {
-      "compact_headers": true,
-      "additional_builder_shallow_bytes": 8,
-      "additional_builder_and_scratch_bytes": 56
-    }
-  ],
-  "provenance": {
-    "protocol": "Initial private size agent and corrected system-loader reflection probe; metadata was later expanded in the reusable source.",
-    "agent_source_sha256": "4783850bf80e9eb0379570bb7794a610406b48bddd7fe36ff499222d01e789b1",
-    "fixture_source_sha256": "842514f97116a1e9cf5eb9a4b951657c90f7639effdfd526357831e2424282bf"
-  },
-  "notes": [
-    "Shallow object sizes only, not a heap walk or whole-game memory measurement.",
-    "Four north-facing adjacent quads produce one retained geometry quad in every process.",
-    "Header modes use separate upstream/patched JVMs.",
-    "Layouts can differ with JVM, architecture, compressed references and object alignment.",
-    "The hook remains optional; these sizes do not establish an FPS or RAM improvement.",
-    "No test agent binaries, game binaries, private worlds, full logs or JFR recordings are published."
-  ]
-}

benchmarks/rust-blockstate-transforms-2026-10-06/identity-regression.json

@@ -1,54 +0,0 @@
-{
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-}

benchmarks/rust-core-2026-10-04/scoped-parity.json

@@ -1,44 +0,0 @@
-{
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-  "minecraft": "26.3",
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
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-  "scope": "Selected integer position, seeded RNG and packed-storage operations only. No gameplay, rendering or performance claim."
-}

benchmarks/rust-cuboid-model-decoding-2026-10-06/scoped-parity.json

@@ -1,40 +0,0 @@
-{
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-}

benchmarks/rust-float-log-2026-10-05/boundary-parity.json

@@ -1,373 +0,0 @@
-{
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-}

benchmarks/rust-liquid-collision-2026-10-06/context-regression.json

@@ -1,202 +0,0 @@
-{
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-  },
-  "fixtures_sha256": {
-    ".local/rust-collision-context-parity/inputs.txt": "60b49e91a7a4999cfb8eb6ac3fbc6ec0a931d68cd53f9737959a2bd2b42be7a5"
-  },
-  "rust_output_sha256": "7b23eb34c86c3db5a9e90bdd8ef772b79b2a06c8460542e032589f7962fd8f64",
-  "references": [
-    {
-      "side": "client",
-      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
-      "output_sha256": "7b23eb34c86c3db5a9e90bdd8ef772b79b2a06c8460542e032589f7962fd8f64",
-      "matched_output_lines": 225126
-    },
-    {
-      "side": "server",
-      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
-      "output_sha256": "7b23eb34c86c3db5a9e90bdd8ef772b79b2a06c8460542e032589f7962fd8f64",
-      "matched_output_lines": 225126
-    }
-  ],
-  "scope": "Actual CollisionContext factories and EntityCollisionContext/Empty/PositionCollisionContext queries on controlled player and marker snapshots. Checks entity identity, captured descending and placement flags, fluid collision flags, empty-stack AIR identity, height thresholds including f32 epsilon, null factories, callback arguments/order/failures and all five fluid type pairs. Entity lifecycle, inventory mutations after capture, experimental minecart contexts, contextual block shape dispatch and live movement integration remain pending."
-}

benchmarks/rust-liquid-collision-2026-10-06/scaffolding-regression.json

@@ -1,204 +0,0 @@
-{
-  "schema": 1,
-  "minecraft": "26.3",
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-  },
-  "fixtures_sha256": {
-    ".local/rust-scaffolding-collision-parity/inputs.txt": "5945054e86700237a7b6de6b362a37a98bdc8afaa67004e8aaa92da1421b552c"
-  },
-  "rust_output_sha256": "33a33cd612c999ab21f1acbbdee522f2ec2b3f877d62f922c665715e3012e207",
-  "references": [
-    {
-      "side": "client",
-      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
-      "output_sha256": "33a33cd612c999ab21f1acbbdee522f2ec2b3f877d62f922c665715e3012e207",
-      "matched_output_lines": 524300
-    },
-    {
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-      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
-      "output_sha256": "33a33cd612c999ab21f1acbbdee522f2ec2b3f877d62f922c665715e3012e207",
-      "matched_output_lines": 524300
-    }
-  ],
-  "scope": "Actual CollisionContext.getCollisionShape dispatch and native scaffolding behavior for all 32 scaffolding states, nine context variants, descending flags, integer Y extremes, nonfinite positions and adjacent double values around the top/bottom float-epsilon thresholds. Full shape coordinates, extrema, box ordering and cube metadata match. A rejecting world proxy verifies selection performs no world reads. Scaffolding placement/update/falling behavior and live movement remain pending."
-}

benchmarks/rust-native-client-2026-10-06/startup-smoke.json

@@ -1,141 +0,0 @@
-{
-  "adapter": {
-    "backend": "Vulkan",
-    "device": 0,
-    "device_type": "Cpu",
-    "name": "llvmpipe (LLVM 21.1.8, 256 bits)",
-    "vendor": 65541
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-  "camera_pitch": -0.3839724354387525,
-  "camera_position": [
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-    25.0
-  ],
-  "camera_yaw": -2.356194490192345,
-  "elapsed_seconds": 0.541997659,
-  "error": null,
-  "merged_quads": 166,
-  "os": "linux",
-  "presented_frames": 30,
-  "project": "Horizon",
-  "resident_chunks": 9,
-  "schema": 1,
-  "scope": "Native opaque-cube renderer and free inspection camera; no gameplay simulation",
-  "window_size": [
-    1280,
-    720
-  ],
-  "executable_sha256": "4907a5678c323ab250934f3dfa32ba10e1554635f81d226ed2a88e7625737c5f",
-  "resource_manifest_sha256": "eda44ebee6904eab880c15458dbd1212dc2799d320a4419fc810e2ceb0e5d9d6",
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-    "crates/horizon-client/src/camera.rs": "f9821c8a51a004dd4ad9c0952e746eb07926f6040cf8660bc26da5a0728ae572",
-    "crates/horizon-client/src/main.rs": "0cc250b695ba0d1e49107f581695edea1d24cdc2fb8ffa3a46368ef2c40430a7",
-    "crates/horizon-client/src/mesh.rs": "e2fa00435ec8239ba8a3c6539022bb50a10ff9c3850c6faab72f86aabea896ef",
-    "crates/horizon-client/src/render.rs": "4d58443465ea25769d73701d138db6a99c4f939a288e89e1f2b1ee3d017a2737",
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-    "Cargo.toml": "4f803d21656a1420555bee6369617ddc825219a2cf05f842a209b3f8eaa583ec",
-    "Cargo.lock": "b1674833e1d5e66032589eea75643bf1c1eb2f2d6503e79ff7da8efa1b6d21dc",
-    "crates/horizon-client/Cargo.toml": "3047995858c9cd103ce358dfd991cb81e7d0688a149f4874cc73c36b859bbff7",
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-    "tools/test_native_client.py": "adb9aa87cc28b0980d811ce47c1b09878d2d72cef2e083b278ec41183d231f1b"
-  },
-  "validation": {
-    "rust_workspace_tests": "passed",
-    "clippy_all_targets": "passed",
-    "python_tooling_tests": 149,
-    "mesh_tests": 2,
-    "manual_visual_checks": [
-      "textured scene with 81 chunks and 382 merged quads",
-      "window resize from 1600x1000 to 1280x720"
-    ],
-    "input_checks": [
-      "physical W movement",
-      "physical Right rotation",
-      "captured relative mouse delta (150,-50) changed yaw by -0.3 and pitch by +0.1 radians",
-      "Escape and Ctrl+Q"
-    ]
-  },
-  "environment": {
-    "os": "Ubuntu 26.04.1 LTS",
-    "kernel": "7.0.0-31-generic",
-    "cpu": "Intel Core i7-7500U",
-    "display": "headless Sway Wayland",
-    "renderer": "Vulkan llvmpipe software rasterizer"
-  },
-  "limits": [
-    "Controlled development scene only; no gameplay simulation or vanilla pixel-parity claim",
-    "No hardware FPS or render-distance improvement demonstrated",
-    "macOS and Windows runtime checks and final playable packages remain pending",
-    "Private game resources and screenshots excluded from this report"
-  ],
-  "mouse_check": {
-    "adapter": {
-      "backend": "Vulkan",
-      "device": 0,
-      "device_type": "Cpu",
-      "name": "llvmpipe (LLVM 21.1.8, 256 bits)",
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-    "elapsed_seconds": 8.654220098,
-    "error": null,
-    "merged_quads": 166,
-    "os": "linux",
-    "presented_frames": 532,
-    "project": "Horizon",
-    "resident_chunks": 9,
-    "schema": 1,
-    "scope": "Native opaque-cube renderer and free inspection camera; no gameplay simulation",
-    "window_size": [
-      1280,
-      720
-    ]
-  },
-  "physical_keyboard_check": {
-    "adapter": {
-      "backend": "Vulkan",
-      "device": 0,
-      "device_type": "Cpu",
-      "name": "llvmpipe (LLVM 21.1.8, 256 bits)",
-      "vendor": 65541
-    },
-    "arch": "x86_64",
-    "camera_pitch": -0.3839724354387525,
-    "camera_position": [
-      18.943610750255,
-      18.0,
-      18.943610750255
-    ],
-    "camera_yaw": -2.6478875051923443,
-    "elapsed_seconds": 17.488515374,
-    "error": null,
-    "merged_quads": 166,
-    "os": "linux",
-    "presented_frames": 1080,
-    "project": "Horizon",
-    "resident_chunks": 9,
-    "schema": 1,
-    "scope": "Native opaque-cube renderer and free inspection camera; no gameplay simulation",
-    "window_size": [
-      1280,
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benchmarks/rust-native-landing-2026-10-07/startup-smoke.json

@@ -1,790 +0,0 @@
-{
-  "adapter": {
-    "backend": "Vulkan",
-    "device": 0,
-    "device_type": "Cpu",
-    "name": "llvmpipe (LLVM 21.1.8, 256 bits)",
-    "vendor": 65541
-  },
-  "animated_sprites": 1,
-  "animation_uploads": 1,
-  "arch": "x86_64",
-  "camera_pitch": -0.3839724354387525,
-  "camera_position": [
-    25.0,
-    18.0,
-    25.0
-  ],
-  "camera_yaw": -2.356194490192345,
-  "collision_camera": false,
-  "culled_model_faces": 59636,
-  "elapsed_seconds": 0.547517663,
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benchmarks/rust-native-movement-statistics-2026-10-07/startup-smoke.json

@@ -1,801 +0,0 @@
-{
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-    "device_type": "Cpu",
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-  "elapsed_seconds": 0.556021335,
-  "error": null,
-  "fall_damage_requests": 0,
-  "last_requested_fall_damage": null,
-  "merged_quads": 3169,
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-  "model_blocks": 10919,
-  "model_gallery": [
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benchmarks/rust-native-sprint-2026-10-07/startup-smoke.json

@@ -1,807 +0,0 @@
-{
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-}

benchmarks/rust-powder-snow-collision-2026-10-06/context-regression.json

@@ -1,203 +0,0 @@
-{
-  "schema": 1,
-  "minecraft": "26.3",
-  "manifest_sha1": "4fe1aa1ef8da1cb95c5bad1fb98890ca56dd8ca3",
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-  "java": "openjdk 25.0.4.1 2026-08-18",
-  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)",
-  "fixtures": 8338,
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-    "crates/horizon-world/examples/collision_context_fixture.rs": "b7bf0f48f7dc0129c1ebe43c11cb4cad00194b501c2bcbb3220bc8779e695ba4"
-  },
-  "fixtures_sha256": {
-    ".local/rust-collision-context-parity/inputs.txt": "60b49e91a7a4999cfb8eb6ac3fbc6ec0a931d68cd53f9737959a2bd2b42be7a5"
-  },
-  "rust_output_sha256": "7b23eb34c86c3db5a9e90bdd8ef772b79b2a06c8460542e032589f7962fd8f64",
-  "references": [
-    {
-      "side": "client",
-      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
-      "output_sha256": "7b23eb34c86c3db5a9e90bdd8ef772b79b2a06c8460542e032589f7962fd8f64",
-      "matched_output_lines": 225126
-    },
-    {
-      "side": "server",
-      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
-      "output_sha256": "7b23eb34c86c3db5a9e90bdd8ef772b79b2a06c8460542e032589f7962fd8f64",
-      "matched_output_lines": 225126
-    }
-  ],
-  "scope": "Actual CollisionContext factories and EntityCollisionContext/Empty/PositionCollisionContext queries on controlled player and marker snapshots. Checks entity identity, captured descending and placement flags, fluid collision flags, empty-stack AIR identity, height thresholds including f32 epsilon, null factories, callback arguments/order/failures and all five fluid type pairs. Entity lifecycle, inventory mutations after capture, experimental minecart contexts, contextual block shape dispatch and live movement integration remain pending."
-}

benchmarks/rust-powder-snow-collision-2026-10-06/liquid-regression.json

@@ -1,205 +0,0 @@
-{
-  "schema": 1,
-  "minecraft": "26.3",
-  "manifest_sha1": "4fe1aa1ef8da1cb95c5bad1fb98890ca56dd8ca3",
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-  },
-  "fixtures_sha256": {
-    ".local/rust-liquid-collision-parity/inputs.txt": "564e80e9a55a186cd70c21a1db14abf59849be90bc5493346e9e64ff9d3c9d8b"
-  },
-  "rust_output_sha256": "d845ce538e9ce157f6455b32e73e03e9d7df86ebc5c9ab80ebf94705500748ab",
-  "references": [
-    {
-      "side": "client",
-      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
-      "output_sha256": "d845ce538e9ce157f6455b32e73e03e9d7df86ebc5c9ab80ebf94705500748ab",
-      "matched_output_lines": 571179
-    },
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-      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
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-      "matched_output_lines": 571179
-    }
-  ],
-  "scope": "Native contextual LiquidBlock collision dispatch for all 32 water/lava states. Checks the always-fluid bypass, source-only selection, living-entity gating, supplied entity standing shapes, exact height boundaries, all 33 above-block fluid states, callback order and failure propagation, null/placement contexts and wrapping above-block coordinates. Full selected shape data and callback traces are compared. Entity-specific standing shape implementations, liquid simulation and live movement remain pending."
-}

benchmarks/rust-powder-snow-collision-2026-10-06/scaffolding-regression.json

@@ -1,205 +0,0 @@
-{
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-  "rustc": "rustc 1.99.0 (b940084d7 2026-09-28)",
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-  "block_states": 32,
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-    "crates/horizon-world/examples/collision_context_fixture.rs": "b7bf0f48f7dc0129c1ebe43c11cb4cad00194b501c2bcbb3220bc8779e695ba4"
-  },
-  "fixtures_sha256": {
-    ".local/rust-scaffolding-collision-parity/inputs.txt": "5945054e86700237a7b6de6b362a37a98bdc8afaa67004e8aaa92da1421b552c"
-  },
-  "rust_output_sha256": "33a33cd612c999ab21f1acbbdee522f2ec2b3f877d62f922c665715e3012e207",
-  "references": [
-    {
-      "side": "client",
-      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
-      "output_sha256": "33a33cd612c999ab21f1acbbdee522f2ec2b3f877d62f922c665715e3012e207",
-      "matched_output_lines": 524300
-    },
-    {
-      "side": "server",
-      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
-      "output_sha256": "33a33cd612c999ab21f1acbbdee522f2ec2b3f877d62f922c665715e3012e207",
-      "matched_output_lines": 524300
-    }
-  ],
-  "scope": "Actual CollisionContext.getCollisionShape dispatch and native scaffolding behavior for all 32 scaffolding states, nine context variants, descending flags, integer Y extremes, nonfinite positions and adjacent double values around the top/bottom float-epsilon thresholds. Full shape coordinates, extrema, box ordering and cube metadata match. A rejecting world proxy verifies selection performs no world reads. Scaffolding placement/update/falling behavior and live movement remain pending."
-}

benchmarks/rust-scaffolding-collision-2026-10-06/context-regression.json

@@ -1,201 +0,0 @@
-{
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-  "references": [
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-  "scope": "Actual CollisionContext factories and EntityCollisionContext/Empty/PositionCollisionContext queries on controlled player and marker snapshots. Checks entity identity, captured descending and placement flags, fluid collision flags, empty-stack AIR identity, height thresholds including f32 epsilon, null factories, callback arguments/order/failures and all five fluid type pairs. Entity lifecycle, inventory mutations after capture, experimental minecart contexts, contextual block shape dispatch and live movement integration remain pending."
-}

benchmarks/rust-worldgen-2026-10-05/scoped-parity.json

@@ -1,307 +0,0 @@
-{
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-    "crates/horizon-core/src/density/tests.rs": "7817796ee40d0ae241bfbebec6bca190e0a8e7d5a1caa8ddf858c3eaa58b8858",
-    "crates/horizon-core/src/density/world_fields.rs": "c1ce305cb8046b384d90c564cafb24af7365d580389637910f3d8b0cc18eb583",
-    "crates/horizon-core/src/geometry/mod.rs": "dc92f73885dd0a7760743bf74f1ab8afa839d61cef2dfef890f8a23b67b4742e",
-    "crates/horizon-core/src/geometry/movement.rs": "930e34abef6f6eeec1ee7a6c920b5ba01bfe37b90678884490f4be53241f6b96",
-    "crates/horizon-core/src/geometry/shape/create.rs": "189812b91d5e0e3ad963afcd1a6e2831b31b8188df91a904ef27061e644806ad",
-    "crates/horizon-core/src/geometry/shape/join.rs": "f1b51887b7bf9482557e3ffa99e136f2e5db07ceeb05fdb116adf45e87129075",
-    "crates/horizon-core/src/geometry/shape.rs": "de22acd7430df3f69ef3632d427c57dffe57f3bdb78950bc75eac7e179ccf9df",
-    "crates/horizon-core/src/geometry/sweep.rs": "abd6009c61555161ef2f18b431b2aa384b126c0871cae8b96a62358498a56a1d",
-    "crates/horizon-core/src/geometry/traversal.rs": "77a3da570a0b85582b669cf4d841cba4b06327006dda26d4a26df4e8ce05bae4",
-    "crates/horizon-core/src/geometry/trig.rs": "05cef9341a298a474221a0556a11ddf47650393ea7a97b4b2022a4da6628fe37",
-    "crates/horizon-core/src/lib.rs": "3968e2a337a6a23226c485057c79359e66df16683f00fb4ebc9fabb03910a015",
-    "crates/horizon-core/src/noise/mod.rs": "1dab5a713abf702402e69ace1bf9e476bba544b0ede5a61c3c3afc60af0a03f3",
-    "crates/horizon-core/src/noise/normal.rs": "e9e7a46472a54a02c98c46da819842090567153b32fe0c84249009ef19af7aad",
-    "crates/horizon-core/src/noise/perlin.rs": "e73815447432eab7542f67366cb3f1b368d164e33f6c9cdbd045ac8e4db0932a",
-    "crates/horizon-core/src/noise/simplex.rs": "6c0dbc15b2b7510195dd28fceca01dcaac1847ccc4a84d299c351589c642fe7a",
-    "crates/horizon-core/src/noise/stack.rs": "7f6ef0e7d920139ef1a6ad3ec5640f92765715f86dcc5ec29f1a149984f45fa3",
-    "crates/horizon-core/src/noise/volume.rs": "3f05d2b1780acfdfee60037677d309937a5033b45ef428fc2d540942d4b56b43",
-    "crates/horizon-core/src/position/iter.rs": "32d2d8e74821cc4e49e3354202d35d3120e4415bfdda9375a73f2137ef651129",
-    "crates/horizon-core/src/position.rs": "e10101088e6902386b9b6d27773d44312f1ff72bebb19e57967a54945dde9dcd",
-    "crates/horizon-core/src/random/hash.rs": "0f88a127a1ba2705d3d6c0ebd009324d6ba86ffa2d27edf2d2a84765e690e4a3",
-    "crates/horizon-core/src/random/positional.rs": "35494745e5d4cf89e282c3ae0ee245e9f2640ddbbc03bc0055df742006a9c862",
-    "crates/horizon-core/src/random.rs": "92135a94c79111cc810b4b071dbd76043ee47c2585fd431e7486ea381f19e5db",
-    "crates/horizon-core/src/storage.rs": "f6c32201c64aefde06e57a2c767be46918df613548a322801546b133799cc33d",
-    "crates/horizon-core/src/ticks/heap.rs": "bf28afab8af77c3d243aa96cd8a1fb8d934140a4dbd07dbfdbf4e7908bb4b845",
-    "crates/horizon-core/src/ticks/index.rs": "1f1a6a568c2a30eafecb020ca4d5f5fc414860de85b8b381fc419a2e3e65c24a",
-    "crates/horizon-core/src/ticks/mod.rs": "84852599dde78687d782f115a5b4b3ef6856c1f9cc92917255167e89c72ab01e",
-    "crates/horizon-core/tests/density_world_fields.rs": "e193e45080817ef92547828a8d106482a376b9f788e39d4d3831f44e9d693148",
-    "crates/horizon-world/examples/collision_fixture.rs": "ee754b5b42e0a51fe0a305b3f4bb56522ff3fffae564180aab8087b1b9e44afc",
-    "crates/horizon-world/examples/tick_fixture.rs": "df267c307e0491a238b2d93edf0384514f38f8ee3252e315b989de56c6e17990",
-    "crates/horizon-world/examples/world_fixture.rs": "a3c4c0f5131ae051b24662eff0ed11ed797c6fd5069fbfdf819f0e3fcdfb2cf4",
-    "crates/horizon-world/src/bin/worldgen_parity.rs": "5af97baa6681bc7aa04d981ec5c07c38cb27f28213abf34b1e83270828dd2980",
-    "crates/horizon-world/src/chunk.rs": "8843e6f48dbbc4245ce4e95564dfba3a4d7a051ba0b1577fb038c07adb0ff0f9",
-    "crates/horizon-world/src/collision.rs": "6c40ab491efd0332bd4e65a1a112f3598f9eb0ea2f32f9c8cc7e81278d003251",
-    "crates/horizon-world/src/compression.rs": "4db73e6ca9a0d552d415ce60e7e88b89c9cf2b7d060a669ff8328f518316e101",
-    "crates/horizon-world/src/lib.rs": "a6376d79c90ebdee539f4b460a9dd18d75e0c049c24f028d00c9c45c85ebf668",
-    "crates/horizon-world/src/main.rs": "fce57418b8c22a6a0a9044baa89ed3d9c243bc2e8413fea3ff0f32985daba021",
-    "crates/horizon-world/src/nbt.rs": "60262c3de8c8f68bc2da0370ccb17393d32b85f5f5022c6358599a7d32119ea6",
-    "crates/horizon-world/src/region.rs": "72b642e87fed37ed17f54d4c30f96c3b64d26c14bc0589c31ef40ff1616188fc",
-    "crates/horizon-world/src/registry.rs": "f46065659e60eb5e84ad69b9f3b5e94dc87ee19de16408817e26f23d16b6c7e7",
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-    "crates/horizon-world/src/worldgen/aquifer/config.rs": "fcd2cc3a520c1527c88f095a3b5d38487e7ebb1ccecc5f757f93d04a069add4f",
-    "crates/horizon-world/src/worldgen/aquifer/noise_based.rs": "74daaa389b5c3dfdc99214dfff256a9e172f83548d2326cbc941d9637cc53fb7",
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-    "crates/horizon-world/src/worldgen/biome.rs": "b3b73091aa5ec989d916206567c5e4b0e997b007a5bb9c0ca5c53ada9d5fe81f",
-    "crates/horizon-world/src/worldgen/climate/codec.rs": "d567adeb5d837816fca69102db51d790f71aec1b51c09298230d24612e400a14",
-    "crates/horizon-world/src/worldgen/climate/index.rs": "c5ce61679a5f0e0f2f0af2a373424effa124d0cce8250609eff38b7034650756",
-    "crates/horizon-world/src/worldgen/climate.rs": "1b9ad44407f40aee4c1cd5357a5c9c443c1b105728f01cf5c644072f99f8357e",
-    "crates/horizon-world/src/worldgen/density.rs": "65a98c156a290a6b374ef670d28cd5dfbe0aa93171824d1bbd96422536273f84",
-    "crates/horizon-world/src/worldgen/router.rs": "2cee7cf15a0d2ada12be6b39d83e78177fd3033922e4f4cce87a64073cec2847",
-    "crates/horizon-world/src/worldgen/settings.rs": "a8fe87752e1982ef11cb67f8d80d8e3428b2c27db178044cb425ba803e689e59",
-    "crates/horizon-world/src/worldgen.rs": "24f440a4be7546e79b4f462dd18aad9031e94dc87c5f1d32b78912650f7dd162",
-    "crates/horizon-world/tests/biome_data.rs": "d4de462ccc3e6ad5760490330e0f0cd8a45734077708a2eca95ca06e65f779b0",
-    "crates/horizon-world/tests/collision_data.rs": "45f3d33b36efe720e99ebf75b9f4fbddd777cebea4618bba245ca106b3443391",
-    "crates/horizon-world/tests/tick_data.rs": "ab345209367db6963b987797992c4a06433bd2039e6021bd834f6305324c04d7",
-    "crates/horizon-world/tests/world_io.rs": "4a42630c99ce89b27cc2be1a1b961ad880f62762ab661f9e92ef9bcf7f3e76e0",
-    "crates/horizon-core/Cargo.toml": "e21b502c949da93cf67826592459b687a8cbf737ef92fee514e3ed2cc7cd27ad",
-    "crates/horizon-world/Cargo.toml": "977338bf3e654193685b015d383493b9f59ff6f5d6210bec212cef8ac4a50bed",
-    "Cargo.toml": "dc370d5fdde37238c3e4820046f11c3201020406a4edfa1308257c13edbdcda4",
-    "Cargo.lock": "7307d0c887364db36d327685ecf0671b75305e31e5ba5fbdcdbb15eaf156d20e"
-  },
-  "references": [
-    {
-      "side": "client",
-      "jar_sha256": "4508d006323f24fa02876310c192d739af56516eb259000ac50f0909a68c9a2d",
-      "output_sha256": "c39201a8d64b2ec12dc08d8eddcb962d336885a749200a0a33c0fefd7910c193",
-      "matched_output_lines": 922238,
-      "biome_export_sha256": "b03e2fbe85c191a22f333bc989bd2a73c66f0f9fbcd9ddb54774f17c247832e9"
-    },
-    {
-      "side": "server",
-      "jar_sha256": "a362163eec5d1612d520772bc16e5b39c09e3b234fdc045f56bf544284ee8ae6",
-      "output_sha256": "c39201a8d64b2ec12dc08d8eddcb962d336885a749200a0a33c0fefd7910c193",
-      "matched_output_lines": 922238,
-      "biome_export_sha256": "b03e2fbe85c191a22f333bc989bd2a73c66f0f9fbcd9ddb54774f17c247832e9"
-    }
-  ],
-  "scope": "Direct normal-noise JSON decoding using the actual pinned vanilla CODEC. Every bundled noise registry resource, explicit/default parameters, empty and full amplitude modifiers, normalization modes, inclusive field bounds with signed-zero comparator ordering, malformed types, null fields, duplicate and ignored keys, decimal/exponent integer truncation and wrapping, signed zero, seeded modern/legacy and Nether construction, octave metadata, range and normalization bits, scalar noise values and parent random state. JSON resource contents stay private. Strict JSON parsing; no claim for Gson's permissive non-JSON syntax. Bundled density registries are also decoded with actual vanilla registry-aware CODECs: named forward references, all bundled function kinds, declared range/axes, raw compilation errors, seeded optimized roots, cache allocation, scalar values, strided bulk values, repeated cache hits and surface-volume errors are compared using RandomState's actual compile context. All seven bundled noise-setting resources contribute their actual eight-field NoiseRouter.CODEC objects to RandomState. Router fields are compiled in declaration order with a shared compiler/context; cache allocation, raw/optimized scalar and repeated strided volume values, successful single-layer surface volumes and invalid surface-volume shapes are compared. Actual RandomState climate sampler binding and quart-to-block coordinate wrapping are checked at ordinary and extreme positions. Float-to-long climate quantization and long-to-float conversion include subnormals, signed zeros, NaNs, infinities, cast saturation and seeded random bit patterns. Actual vanilla Climate.Parameter and ParameterPoint JSON codecs compare scalar, two-element list and min/max object intervals, float endpoint bounds/ordering, required coordinate/offset fields, negative zero, precision-sensitive float parsing, malformed types and duplicate keys. Climate parameter distances, wrapping squared fitness, stable search-tree leaf order and nearest lookup are compared across every supported branching value 2..32, sizes around branch powers, the 65536-entry API bound, duplicates, warm ties, fresh lookups, brute-force lookup and extreme signed-long endpoints/targets. The Rust tree is immutable with per-worker search state instead of hidden thread locals; invalid or degenerate searches return typed errors. Inline arbitrary distance metrics and behavior outside the bounded API are not covered. Built-in Overworld and Nether quantized biome parameter tables are exported independently by each authenticated JAR and required to agree before Rust consumes them. The Rust multi-noise resolver and actual vanilla MultiNoiseBiomeSource compare biome identities through scalar climate queries and prepared bulk quart volumes, including forward/reverse/repeated query order, wrapped extreme origins and shared previous-result state. Biome holder keys in the reference are registration placeholders; no biome property or gameplay behavior is evaluated. The Rust loader reads a Horizon quantized table format, not the vanilla biome codec, and the preset builders themselves have not been ported. Source and private fixture mutations during validation invalidate the report. The two-field 26.3 NoiseSettings codec, create helper and LevelHeightAccessor clamping are also compared across bundled noise members, dimension/alignment bounds, zero/negative runtime heights, disjoint ranges, wrapped integer arithmetic and decimal/exponent integer conversion. Global fluid cutoff selection and the actual disabled Aquifer implementation are compared with original default block-state identities, extreme sea levels/coordinates, signed-zero/subnormal/nonfinite density and counted picker calls; developer fluid-disable behavior is outside the regular-mode corpus. The actual noise-based Aquifer.Config codec and runtime are compared across bundled aquifer settings, modern/legacy world-seeded aquifer factories, synthetic density roots, nondefault water/lava states, cave/void air, nonfinite sampler overrides, strided volume extents, wrapped coordinates, repeated and reversed queries, counted picker calls, sampler call order/values, injected failures and retry state, scheduling flags, populated location/status caches and sorted surface-cache entries. Oversized or wrapped-invalid grid allocations and developer fluid-disable behavior are outside the bounded regular-mode API. Terrain filling is not yet validated. Router, vertical noise and optional aquifer members are decoded from each noise-setting resource; complete NoiseGeneratorSettings, material rules, nonempty world fields, biome registry/codecs and complete chunk biome assignment, generated chunks, gameplay and rendering remain pending. Inline noise holders and general codec behavior beyond the covered fixtures remain pending."
-}

benchmarks/shader-worlds-2026-10-04/live-observations.json

@@ -1,342 +0,0 @@
-{
-  "schema": 1,
-  "measurement": "Shader world activation/startup probes; not FPS or physical M2 measurements",
-  "release": "0.20.0",
-  "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-  "local_source_commit": "99d6aae5e06a3fc9a9a69c433f48f32729776861",
-  "linux_opengl": {
-    "schema": 1,
-    "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-    "architecture": "x86_64",
-    "minecraft": "26.3",
-    "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-    "results": [
-      {
-        "observed_mode": "world",
-        "title_screen_observed": false,
-        "world_loaded": true,
-        "ready_client_ticks": 40,
-        "window_active": true,
-        "overlay_present": false,
-        "overlay_wait_ticks": 79,
-        "heap_max_bytes": 6442450944,
-        "iris_capture_status": "available",
-        "iris_shaders_enabled": true,
-        "shader_required": true,
-        "iris_expected_pack_matches": true,
-        "framebuffer_width": 1280,
-        "framebuffer_height": 800,
-        "sampled_pixels": 4288,
-        "distinct_sampled_rgb": 3777,
-        "gpu": "llvmpipe (LLVM 21.1.8, 256 bits)",
-        "graphics_backend": "OpenGL",
-        "graphics_driver": "4.5 (Core Profile) Mesa 26.0.8-1ubuntu0.3",
-        "private_png_sha256": "1a221bb9bedb21770f08ffcde593539c02d4e7cad48516bf7fad4215d7b14cde",
-        "profile": "cinematic",
-        "preferred_backend": "opengl",
-        "launcher_exit_code": 0,
-        "backend_attempts": [
-          {
-            "backend": "OpenGL",
-            "operation": "load_library",
-            "result": "success"
-          },
-          {
-            "backend": "OpenGL",
-            "operation": "create_device",
-            "result": "success"
-          }
-        ]
-      }
-    ],
-    "limits": [
-      "Short scene startup and nonuniform framebuffer readback only.",
-      "World mode uses the ordinary limited demo; world files remain private.",
-      "No exhaustive gameplay, visual-correctness, FPS or M2 Pro performance claim.",
-      "Vulkan preference can fall back; inspect the observed backend.",
-      "PNG images, assets and full logs remain in the private runtime directory."
-    ]
-  },
-  "linux_vulkan_failure": {
-    "exit_code": 1,
-    "result_count": 0,
-    "java_exception_types": [
-      "java.awt.AWTError",
-      "java.lang.NullPointerException",
-      "java.lang.RuntimeException",
-      "net.minecraft.ReportedException"
-    ],
-    "expected_demo_authentication_errors_observed": true,
-    "backend_attempts": [
-      {
-        "backend": "Vulkan",
-        "operation": "load_library",
-        "result": "success"
-      },
-      {
-        "backend": "Vulkan",
-        "operation": "create_device",
-        "result": "success"
-      }
-    ],
-    "created_devices": [
-      {
-        "gpu": "llvmpipe (LLVM 21.1.8, 256 bits)",
-        "graphics_backend": "Vulkan",
-        "graphics_driver": "1.4.335 llvmpipe Mesa 26.0.8-1ubuntu0.3 (LLVM 21.1.8)"
-      }
-    ],
-    "client_initializer_reached": true,
-    "readback_requested": false,
-    "readback_callback_received": false,
-    "readback_inspections": [],
-    "probe_failure_categories": [],
-    "vulkan_error_codes": [],
-    "fatal_jvm_error": false,
-    "observed_graphics_stack_methods": [
-      "net.minecraft.client.renderer.Lightmap.handler$zzk000$distanthorizons$render",
-      "net.minecraft.client.renderer.Lightmap.render",
-      "net.minecraft.client.renderer.GameRenderer.render"
-    ],
-    "profile": "cinematic",
-    "preferred_backend": "vulkan"
-  },
-  "linux_vulkan_without_dh": {
-    "private_dh_jar_removed": true,
-    "new_demo_world": true,
-    "exit_code": 1,
-    "result_count": 0,
-    "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-    "failure": {
-      "exit_code": 1,
-      "result_count": 0,
-      "java_exception_types": [
-        "java.lang.AssertionError",
-        "java.lang.RuntimeException"
-      ],
-      "expected_demo_authentication_errors_observed": true,
-      "backend_attempts": [
-        {
-          "backend": "Vulkan",
-          "operation": "load_library",
-          "result": "success"
-        },
-        {
-          "backend": "Vulkan",
-          "operation": "create_device",
-          "result": "success"
-        }
-      ],
-      "created_devices": [
-        {
-          "gpu": "llvmpipe (LLVM 21.1.8, 256 bits)",
-          "graphics_backend": "Vulkan",
-          "graphics_driver": "1.4.335 llvmpipe Mesa 26.0.8-1ubuntu0.3 (LLVM 21.1.8)"
-        }
-      ],
-      "client_initializer_reached": true,
-      "readback_requested": true,
-      "readback_callback_received": true,
-      "readback_inspections": [
-        {
-          "framebuffer_width": 1280,
-          "framebuffer_height": 800,
-          "sampled_pixels": 4288,
-          "distinct_sampled_rgb": 1804
-        }
-      ],
-      "probe_failure_categories": [
-        "shader_inactive"
-      ],
-      "vulkan_error_codes": [],
-      "fatal_jvm_error": false,
-      "observed_graphics_stack_methods": [
-        "net.minecraft.client.Screenshot.lambda$takeScreenshot$1",
-        "com.mojang.renderpearl.backend.vulkan.DestructionQueue.rotate",
-        "com.mojang.renderpearl.backend.vulkan.VulkanCommandEncoder.submit",
-        "com.mojang.renderpearl.frontend.FrontendCommandEncoder.submit"
-      ]
-    }
-  },
-  "mac_source_commit": "857c5a4aa553f83799631ad48340e43a13c78549",
-  "mac_run_url": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37198566508",
-  "mac_cases": [
-    {
-      "case": [
-        "--profile",
-        "cinematic",
-        "--backend",
-        "opengl",
-        "--world",
-        "--shaders"
-      ],
-      "exit_code": 1,
-      "failure": [
-        {
-          "fixture": "client-graphics",
-          "profile": "cinematic",
-          "completed": false
-        }
-      ]
-    },
-    {
-      "case": [
-        "--profile",
-        "cinematic",
-        "--backend",
-        "vulkan",
-        "--world",
-        "--shaders"
-      ],
-      "exit_code": 1,
-      "failure": [
-        {
-          "fixture": "client-graphics",
-          "profile": "cinematic",
-          "completed": false
-        }
-      ]
-    }
-  ],
-  "limits": [
-    "Linux llvmpipe software renderer; no physical M2 shader performance or native GPU test.",
-    "OpenGL requires actual pinned shader activation and matching runtime pack identity, with nonuniform readback, focused gameplay, saved data and clean exit.",
-    "Linux Vulkan plus DH fails before readback; selected stack locations alone do not establish the root cause.",
-    "Removing DH privately produces an ordinary Vulkan world readback but Iris reports shaders inactive; the required-activation assertion rejects it.",
-    "Both hosted Mac cases hit the 240-second private fixture timeout; earlier diagnostics do not retain stages or waiting state. They do not establish shader compatibility or incompatibility.",
-    "Full logs, raw PNGs, world data, assets and shader ZIPs remain private.",
-    "Diagnostic repeat: OpenGL loads a world but retains a screen before readback; Vulkan initializes its device but records no waiting-state snapshot. Both time out; screen identity and root causes are unknown."
-  ],
-  "mac_diagnostic_repeat": {
-    "source_commit": "ed416c91cf980f136b7431314bccea7f266fe049",
-    "run_url": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37199837867",
-    "cases": [
-      {
-        "case": [
-          "--profile",
-          "cinematic",
-          "--backend",
-          "opengl",
-          "--world",
-          "--shaders"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": -15,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.IllegalStateException",
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "OpenGL",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "OpenGL",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Software Renderer",
-                "graphics_backend": "OpenGL",
-                "graphics_driver": "4.1 APPLE-23.1.1"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": false,
-            "readback_callback_received": false,
-            "readback_inspections": [],
-            "last_waiting_state": {
-              "world_loaded": true,
-              "player_present": true,
-              "overlay_present": false,
-              "screen_present": true,
-              "window_active": true,
-              "paused": false,
-              "ready_client_ticks": 0
-            },
-            "probe_failure_categories": [],
-            "vulkan_error_codes": [],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [
-              "net.minecraft.client.renderer.LevelRenderer.mixinextras$bridge$renderGroup$135",
-              "net.minecraft.client.renderer.LevelRenderer.wrapOperation$bio000$iris$beginTerrainLayer",
-              "net.minecraft.client.renderer.LevelRenderer.executeSolid",
-              "net.minecraft.client.renderer.LevelRenderer.lambda$addMainPass$0",
-              "com.mojang.blaze3d.framegraph.FrameGraphBuilder.execute",
-              "net.minecraft.client.renderer.LevelRenderer.render",
-              "net.minecraft.client.renderer.GameRenderer.mixinextras$bridge$render$86",
-              "net.minecraft.client.renderer.GameRenderer.wrapOperation$bjf000$iris$renderLevel"
-            ],
-            "fixture": "client-graphics",
-            "profile": "cinematic",
-            "completed": false,
-            "timed_out": true,
-            "timeout_seconds": 240
-          }
-        ]
-      },
-      {
-        "case": [
-          "--profile",
-          "cinematic",
-          "--backend",
-          "vulkan",
-          "--world",
-          "--shaders"
-        ],
-        "exit_code": 1,
-        "failure": [
-          {
-            "exit_code": -15,
-            "result_count": 0,
-            "java_exception_types": [
-              "java.lang.RuntimeException"
-            ],
-            "expected_demo_authentication_errors_observed": true,
-            "backend_attempts": [
-              {
-                "backend": "Vulkan",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "Vulkan",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ],
-            "created_devices": [
-              {
-                "gpu": "Apple Paravirtual device",
-                "graphics_backend": "Vulkan",
-                "graphics_driver": "1.2.350 MoltenVK 1.4.2"
-              }
-            ],
-            "client_initializer_reached": true,
-            "readback_requested": false,
-            "readback_callback_received": false,
-            "readback_inspections": [],
-            "last_waiting_state": null,
-            "probe_failure_categories": [],
-            "vulkan_error_codes": [],
-            "fatal_jvm_error": false,
-            "observed_graphics_stack_methods": [],
-            "fixture": "client-graphics",
-            "profile": "cinematic",
-            "completed": false,
-            "timed_out": true,
-            "timeout_seconds": 240
-          }
-        ]
-      }
-    ]
-  }
-}

benchmarks/software-identity-2026-10-04/live-observations.json

@@ -1,160 +0,0 @@
-{
-  "schema": 1,
-  "purpose": "Functional software identity capture, not a performance comparison",
-  "minecraft": "26.3",
-  "platform": "Linux x86_64 software OpenGL",
-  "source_commit": "110c75d712ed4827ae5e72c613f834bcc4e97da2",
-  "original_mod_sha256": "98f8db7ca8962a71625eef835f57d25c8afb802f2cf1b7c4c832fc070757e011",
-  "results": [
-    {
-      "kind": "frames",
-      "elapsed_seconds": 15.335704769,
-      "java_vendor": "Ubuntu",
-      "java_vm_name": "OpenJDK 64-Bit Server VM",
-      "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-      "mods": [
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+38c7a2d55d",
-        "[email protected]+fcdff87f02",
-        "[email protected]+3434d6d902",
-        "[email protected]+26.3",
-        "[email protected]+74ed1ea502",
-        "[email protected]+0ae6f91102",
-        "[email protected]+3434d6d902",
-        "[email protected]+4be74c3f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+74ed1ea55d",
-        "[email protected]+6b5b47fd5d",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+3434d6d902",
-        "[email protected]+427eab975d",
-        "[email protected]+3434d6d902",
-        "[email protected]+47f74c9802",
-        "[email protected]+3434d6d902",
-        "[email protected]+3434d6d902",
-        "[email protected]+3434d6d902",
-        "[email protected]+cf6bc2db5d",
-        "[email protected]+3434d6d902",
-        "[email protected]+ffef5f6702",
-        "[email protected]+4068fd645d",
-        "[email protected]+ed66f0a35d",
-        "[email protected]+3434d6d902",
-        "[email protected]+fcdff87f5d",
-        "[email protected]+fcdff87f02",
-        "[email protected]+3434d6d902",
-        "[email protected]+3434d6d902",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+79385d0b5d",
-        "[email protected]+b9d63e335d",
-        "[email protected]+3434d6d902",
-        "[email protected]+901a437c02",
-        "[email protected]+3434d6d902",
-        "[email protected]+4fc5413f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+48607d035d",
-        "[email protected]+74ed1ea502",
-        "[email protected]+3434d6d902",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+52268a0e02",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+26.3",
-        "java@25",
-        "[email protected]+mc26.3",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+mc26.3",
-        "[email protected]",
-        "[email protected]"
-      ],
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "samples": 38,
-      "csv_count_matched": true
-    },
-    {
-      "kind": "ticks",
-      "elapsed_seconds": 15.009787535,
-      "java_vendor": "Ubuntu",
-      "java_vm_name": "OpenJDK 64-Bit Server VM",
-      "java_runtime_version": "25.0.4.1+1-1-26.04.4-Ubuntu",
-      "mods": [
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+38c7a2d55d",
-        "[email protected]+fcdff87f02",
-        "[email protected]+3434d6d902",
-        "[email protected]+26.3",
-        "[email protected]+74ed1ea502",
-        "[email protected]+0ae6f91102",
-        "[email protected]+3434d6d902",
-        "[email protected]+4be74c3f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+74ed1ea55d",
-        "[email protected]+6b5b47fd5d",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+3434d6d902",
-        "[email protected]+427eab975d",
-        "[email protected]+3434d6d902",
-        "[email protected]+47f74c9802",
-        "[email protected]+3434d6d902",
-        "[email protected]+3434d6d902",
-        "[email protected]+3434d6d902",
-        "[email protected]+cf6bc2db5d",
-        "[email protected]+3434d6d902",
-        "[email protected]+ffef5f6702",
-        "[email protected]+4068fd645d",
-        "[email protected]+ed66f0a35d",
-        "[email protected]+3434d6d902",
-        "[email protected]+fcdff87f5d",
-        "[email protected]+fcdff87f02",
-        "[email protected]+3434d6d902",
-        "[email protected]+3434d6d902",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+79385d0b5d",
-        "[email protected]+b9d63e335d",
-        "[email protected]+3434d6d902",
-        "[email protected]+901a437c02",
-        "[email protected]+3434d6d902",
-        "[email protected]+4fc5413f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+48607d035d",
-        "[email protected]+74ed1ea502",
-        "[email protected]+3434d6d902",
-        "[email protected]+fcdff87f02",
-        "[email protected]+fcdff87f02",
-        "[email protected]+52268a0e02",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+26.3",
-        "java@25",
-        "[email protected]+mc26.3",
-        "[email protected]",
-        "[email protected]",
-        "[email protected]+mc26.3",
-        "[email protected]",
-        "[email protected]"
-      ],
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "samples": 301,
-      "csv_count_matched": true
-    }
-  ],
-  "notes": [
-    "Actual frame and integrated-server tick reports contain identical Java identity and 59 loaded mod versions, captured before each recording starts.",
-    "The short 15-second recording validates metadata and file output only; it is not a valid performance comparison or a Mac result.",
-    "The actual old/new report pair loads in the offline viewer with matching CSV timelines, an explicit Horizon mod-version difference and unknown legacy Java implementation warnings.",
-    "Synthetic changed versions, reordered mod lists, missing legacy identity, escaped mod names and expanded lists at 390px pass offline checks."
-  ]
-}

benchmarks/terrain-position-2026-10-04/exploratory-observations.json

@@ -1,274 +0,0 @@
-{
-  "schema": 1,
-  "original_mod_sha256": "7e0ffb16fbda2117ce3cfe9fc6249ff3c06c63be764207963ba331871ed6fabd",
-  "groups": [
-    {
-      "label": "initial",
-      "initial_warmup_checks": 1000000,
-      "per_observation_warmup_checks": 0,
-      "observations": 1,
-      "compiler_diagnostics": false,
-      "compilation_waits": false,
-      "results": [
-        {
-          "enabled": false,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 2000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 120024838,
-          "wall_ns": 161908976
-        },
-        {
-          "enabled": true,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 2000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 225290712,
-          "wall_ns": 296105327
-        }
-      ]
-    },
-    {
-      "label": "compiler-diagnostic",
-      "initial_warmup_checks": 1000000,
-      "per_observation_warmup_checks": 4000000,
-      "observations": 3,
-      "compiler_diagnostics": true,
-      "compilation_waits": false,
-      "results": [
-        {
-          "enabled": false,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 6000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 338028221,
-          "wall_ns": 414836219,
-          "observations": [
-            {
-              "cpu_ns": 116948835,
-              "wall_ns": 177862175,
-              "allocated_bytes": 400
-            },
-            {
-              "cpu_ns": 118223124,
-              "wall_ns": 134092410,
-              "allocated_bytes": 0
-            },
-            {
-              "cpu_ns": 102856262,
-              "wall_ns": 102881634,
-              "allocated_bytes": 0
-            }
-          ]
-        },
-        {
-          "enabled": true,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 6000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 277210100,
-          "wall_ns": 346114782,
-          "observations": [
-            {
-              "cpu_ns": 98829230,
-              "wall_ns": 109874899,
-              "allocated_bytes": 400
-            },
-            {
-              "cpu_ns": 99766363,
-              "wall_ns": 120221997,
-              "allocated_bytes": 0
-            },
-            {
-              "cpu_ns": 78614507,
-              "wall_ns": 116017886,
-              "allocated_bytes": 0
-            }
-          ]
-        }
-      ]
-    },
-    {
-      "label": "normal-early",
-      "initial_warmup_checks": 1000000,
-      "per_observation_warmup_checks": 4000000,
-      "observations": 3,
-      "compiler_diagnostics": false,
-      "compilation_waits": false,
-      "results": [
-        {
-          "enabled": false,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 6000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 250273130,
-          "wall_ns": 250904773,
-          "observations": [
-            {
-              "cpu_ns": 96863757,
-              "wall_ns": 97499670,
-              "allocated_bytes": 400
-            },
-            {
-              "cpu_ns": 76736599,
-              "wall_ns": 76731887,
-              "allocated_bytes": 0
-            },
-            {
-              "cpu_ns": 76672774,
-              "wall_ns": 76673216,
-              "allocated_bytes": 0
-            }
-          ]
-        },
-        {
-          "enabled": true,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 6000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 260828228,
-          "wall_ns": 292619474,
-          "observations": [
-            {
-              "cpu_ns": 100375163,
-              "wall_ns": 120697389,
-              "allocated_bytes": 400
-            },
-            {
-              "cpu_ns": 97211084,
-              "wall_ns": 108680199,
-              "allocated_bytes": 0
-            },
-            {
-              "cpu_ns": 63241981,
-              "wall_ns": 63241886,
-              "allocated_bytes": 0
-            }
-          ]
-        }
-      ]
-    },
-    {
-      "label": "normal-long-warmup",
-      "initial_warmup_checks": 10000000,
-      "per_observation_warmup_checks": 4000000,
-      "observations": 3,
-      "compiler_diagnostics": false,
-      "compilation_waits": true,
-      "results": [
-        {
-          "enabled": false,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 6000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 331478729,
-          "wall_ns": 331596880,
-          "observations": [
-            {
-              "cpu_ns": 111403835,
-              "wall_ns": 111532068,
-              "allocated_bytes": 400
-            },
-            {
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-              "allocated_bytes": 0
-            },
-            {
-              "cpu_ns": 111501423,
-              "wall_ns": 111493145,
-              "allocated_bytes": 0
-            }
-          ]
-        },
-        {
-          "enabled": true,
-          "applied_hook_checked": true,
-          "owners": 30,
-          "queries": 491520,
-          "nonzero": 327049,
-          "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-          "data_fingerprint": -5590987990034711991,
-          "data_unchanged": true,
-          "measured_checks": 6000000,
-          "checksum": 274877907204874744,
-          "allocated_bytes": 400,
-          "cpu_ns": 260347437,
-          "wall_ns": 260362090,
-          "observations": [
-            {
-              "cpu_ns": 74253874,
-              "wall_ns": 74284701,
-              "allocated_bytes": 400
-            },
-            {
-              "cpu_ns": 96313457,
-              "wall_ns": 96305444,
-              "allocated_bytes": 0
-            },
-            {
-              "cpu_ns": 89780106,
-              "wall_ns": 89771945,
-              "allocated_bytes": 0
-            }
-          ]
-        }
-      ]
-    }
-  ],
-  "notes": [
-    "Exploratory fixed-order single forks. Earlier fixture protocols were not committed; warmup and diagnostics differ between groups.",
-    "Current production arithmetic is the same binary in all groups. Only the final protocol is reproducible from source commit c6ec0b5.",
-    "Retains favorable and unfavorable observations; do not combine different protocols into a statistical speedup estimate.",
-    "Not game FPS/RAM, Mac GPU, retained-memory or cross-hardware performance evidence."
-  ]
-}

benchmarks/terrain-position-2026-10-04/linux-applied-hooks.json

@@ -1,88 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-6.17.0-1022-azure-x86_64-with-glibc2.39",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "7e0ffb16fbda2117ce3cfe9fc6249ff3c06c63be764207963ba331871ed6fabd",
-  "results": [
-    {
-      "enabled": false,
-      "applied_hook_checked": true,
-      "owners": 30,
-      "queries": 491520,
-      "nonzero": 327049,
-      "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-      "data_fingerprint": -5590987990034711991,
-      "data_unchanged": true,
-      "measured_checks": 6000000,
-      "checksum": 274877907204874744,
-      "allocated_bytes": 400,
-      "cpu_ns": 164904484,
-      "wall_ns": 164901169,
-      "observations": [
-        {
-          "cpu_ns": 59683623,
-          "wall_ns": 59686627,
-          "allocated_bytes": 400
-        },
-        {
-          "cpu_ns": 52733305,
-          "wall_ns": 52727455,
-          "allocated_bytes": 0
-        },
-        {
-          "cpu_ns": 52487556,
-          "wall_ns": 52487087,
-          "allocated_bytes": 0
-        }
-      ]
-    },
-    {
-      "enabled": true,
-      "applied_hook_checked": true,
-      "owners": 30,
-      "queries": 491520,
-      "nonzero": 327049,
-      "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-      "data_fingerprint": -5590987990034711991,
-      "data_unchanged": true,
-      "measured_checks": 6000000,
-      "checksum": 274877907204874744,
-      "allocated_bytes": 400,
-      "cpu_ns": 151660192,
-      "wall_ns": 151647654,
-      "observations": [
-        {
-          "cpu_ns": 56070222,
-          "wall_ns": 56068070,
-          "allocated_bytes": 400
-        },
-        {
-          "cpu_ns": 47850398,
-          "wall_ns": 47843978,
-          "allocated_bytes": 0
-        },
-        {
-          "cpu_ns": 47739572,
-          "wall_ns": 47735606,
-          "allocated_bytes": 0
-        }
-      ]
-    }
-  ],
-  "notes": [
-    "Actual public full-data lookup inside Fabric with generated numeric column data.",
-    "Thirty owners span positive/negative origins and six detail levels; output digests and source fingerprints match.",
-    "The actual redirect method is checked in each mode; source column data remains unchanged.",
-    "Three sequential warmed caller-loop observations are not independent forks; JIT compilation can vary.",
-    "Not whole-game FPS/RAM, rendered-pixel equivalence or a Mac GPU benchmark."
-  ],
-  "provenance": {
-    "source_commit": "c6ec0b5e14d2ea3546fb8858be4a655634a93387",
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37171062262",
-    "job": "portable-mod (ubuntu-latest)",
-    "artifact": "horizon-ubuntu-latest",
-    "command": "python tools/test_terrain_position.py"
-  }
-}

benchmarks/terrain-position-2026-10-04/live-observations.json

@@ -1,126 +0,0 @@
-{
-  "schema": 1,
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "7e0ffb16fbda2117ce3cfe9fc6249ff3c06c63be764207963ba331871ed6fabd",
-  "platform": "Linux x86_64",
-  "graphics": "llvmpipe software OpenGL",
-  "settings": {
-    "heap_bytes": 3221225472,
-    "gc": "G1",
-    "compact_headers": true,
-    "render_distance": 12,
-    "simulation_distance": 12,
-    "lod_radius_chunks": 128,
-    "lod_quality": "MEDIUM/MEDIUM/BLOCK",
-    "terrain_workers": 2,
-    "runtime_ratio": 0.5,
-    "world_difficulty": "PEACEFUL"
-  },
-  "results": [
-    {
-      "profile": "m2-balanced",
-      "position_enabled": false,
-      "elapsed_seconds": 120.557552272,
-      "frame_samples": 221,
-      "tick_samples": 2401,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "visual_settings_changed": [],
-      "frame_stats": {
-        "count": 221,
-        "meanMs": 539.3068458597285,
-        "p50Ms": 512.140615,
-        "p95Ms": 731.515105,
-        "p99Ms": 811.750394,
-        "maxMs": 995.181191,
-        "meanRate": 1.8542319788391781,
-        "lowOnePercentRate": 1.1163478251626853,
-        "over16Ms": 221,
-        "over33Ms": 221,
-        "over50Ms": 221,
-        "over100Ms": 221
-      },
-      "tick_stats": {
-        "count": 2401,
-        "meanMs": 9.190547997917534,
-        "p50Ms": 8.84372,
-        "p95Ms": 16.100883,
-        "p99Ms": 21.297713,
-        "maxMs": 50.24744,
-        "meanRate": 108.8074400162632,
-        "lowOnePercentRate": 34.084420672139515,
-        "over16Ms": 99,
-        "over33Ms": 6,
-        "over50Ms": 1,
-        "over100Ms": 0
-      },
-      "process_rss_peak_sampled_bytes": 2961256448,
-      "launcher_exit_code": 0
-    },
-    {
-      "profile": "terrain-position",
-      "position_enabled": true,
-      "elapsed_seconds": 120.41545128,
-      "frame_samples": 219,
-      "tick_samples": 2401,
-      "excluded_frames": 0,
-      "dropped_samples": 0,
-      "visual_settings_changed": [],
-      "frame_stats": {
-        "count": 219,
-        "meanMs": 543.8858950547946,
-        "p50Ms": 511.34048,
-        "p95Ms": 780.127415,
-        "p99Ms": 989.910492,
-        "maxMs": 1062.14914,
-        "meanRate": 1.8386209480561242,
-        "lowOnePercentRate": 0.9801615082035254,
-        "over16Ms": 219,
-        "over33Ms": 219,
-        "over50Ms": 219,
-        "over100Ms": 219
-      },
-      "tick_stats": {
-        "count": 2401,
-        "meanMs": 9.594661623490213,
-        "p50Ms": 9.152511,
-        "p95Ms": 17.227297,
-        "p99Ms": 25.78339,
-        "maxMs": 56.681493,
-        "meanRate": 104.22462398796237,
-        "lowOnePercentRate": 30.354925598948153,
-        "over16Ms": 143,
-        "over33Ms": 9,
-        "over50Ms": 1,
-        "over100Ms": 0
-      },
-      "process_rss_peak_sampled_bytes": 2989678592,
-      "launcher_exit_code": 0
-    }
-  ],
-  "provenance": {
-    "source_commit": "c6ec0b5e14d2ea3546fb8858be4a655634a93387",
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37171062262",
-    "runtime_mod_matches_linux_ci": true,
-    "initial_player_snapshot_sha256": "b4d11dbd6443625415a1e32aa242d0e2d09cd77ddb1becfde5d35cb6ab8d278a",
-    "initial_level_snapshot_sha256": "86a3c75ea993e50c4428da4dbadc5856688a9367f035c41b8bb49863a9aeb644",
-    "first_saved_player_position": [
-      -56.5,
-      69.0,
-      55.5
-    ],
-    "first_saved_player_rotation": [
-      141.5,
-      16.950002670288086
-    ]
-  },
-  "notes": [
-    "Fixed-order candidate then control single pair, separate copies of the same private world; approximately 307 seconds from demo-popup dismissal to capture for each. Initial player camera and both first saved camera positions matched.",
-    "Stationary view includes LOD terrain; both recordings have zero paused/unfocused exclusions and matching captured settings apart from the isolated hook. No statistical speed estimate is established.",
-    "Preceding 60-second JFR captures ran separately before the frame recording; JIT/cache/profiling effects are not eliminated.",
-    "Candidate saved, reloaded, saved again and quit; control saved and quit. Both foreground launchers returned 0, with no crash reports or remaining game processes.",
-    "Scene differs from earlier release captures, so comparisons across releases are not valid. Private test-world camera preparation is not included in the mod or release packs.",
-    "No FPS improvement is established. Software rendering dominates this machine; these are functional observations, not Mac, GPU or unified-memory performance results. RSS is process resident memory, not complete GPU/unified RAM."
-  ]
-}

benchmarks/terrain-position-2026-10-04/local-applied-hooks.json

@@ -1,98 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "7e0ffb16fbda2117ce3cfe9fc6249ff3c06c63be764207963ba331871ed6fabd",
-  "results": [
-    {
-      "enabled": false,
-      "applied_hook_checked": true,
-      "owners": 30,
-      "queries": 491520,
-      "nonzero": 327049,
-      "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-      "data_fingerprint": -5590987990034711991,
-      "data_unchanged": true,
-      "measured_checks": 6000000,
-      "checksum": 274877907204874744,
-      "allocated_bytes": 400,
-      "cpu_ns": 331478729,
-      "wall_ns": 331596880,
-      "observations": [
-        {
-          "cpu_ns": 111403835,
-          "wall_ns": 111532068,
-          "allocated_bytes": 400
-        },
-        {
-          "cpu_ns": 108573471,
-          "wall_ns": 108571667,
-          "allocated_bytes": 0
-        },
-        {
-          "cpu_ns": 111501423,
-          "wall_ns": 111493145,
-          "allocated_bytes": 0
-        }
-      ]
-    },
-    {
-      "enabled": true,
-      "applied_hook_checked": true,
-      "owners": 30,
-      "queries": 491520,
-      "nonzero": 327049,
-      "lookup_digest": "c9745cc2e7cf6c486a92f87635c87590db61127063970c8a8c7bfb2ef5282cca",
-      "data_fingerprint": -5590987990034711991,
-      "data_unchanged": true,
-      "measured_checks": 6000000,
-      "checksum": 274877907204874744,
-      "allocated_bytes": 400,
-      "cpu_ns": 260347437,
-      "wall_ns": 260362090,
-      "observations": [
-        {
-          "cpu_ns": 74253874,
-          "wall_ns": 74284701,
-          "allocated_bytes": 400
-        },
-        {
-          "cpu_ns": 96313457,
-          "wall_ns": 96305444,
-          "allocated_bytes": 0
-        },
-        {
-          "cpu_ns": 89780106,
-          "wall_ns": 89771945,
-          "allocated_bytes": 0
-        }
-      ]
-    }
-  ],
-  "notes": [
-    "Actual public full-data lookup inside Fabric with generated numeric column data.",
-    "Thirty owners span positive/negative origins and six detail levels; output digests and source fingerprints match.",
-    "The actual redirect method is checked in each mode; source column data remains unchanged.",
-    "Three sequential warmed caller-loop observations are not independent forks; JIT compilation can vary.",
-    "Not whole-game FPS/RAM, rendered-pixel equivalence or a Mac GPU benchmark."
-  ],
-  "provenance": {
-    "source_commit": "c6ec0b5e14d2ea3546fb8858be4a655634a93387",
-    "command": "python tools/test_terrain_position.py",
-    "protocol": {
-      "initial_warmup_checks": 10000000,
-      "initial_compilation_wait_ms": 1000,
-      "observation_count": 3,
-      "per_observation_warmup_checks": 4000000,
-      "per_observation_compilation_wait_ms": 200,
-      "per_observation_measured_checks": 2000000,
-      "run_order": [
-        false,
-        true
-      ],
-      "compiler_diagnostics": false
-    }
-  }
-}

benchmarks/terrain-read-2026-10-04/linux-applied-hooks.json

@@ -1,43 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-6.17.0-1022-azure-x86_64-with-glibc2.39",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "c506982631880604513de8ef85e3b4461fbb898702e60b4a6f74ca3b3d4a687f",
-  "results": [
-    {
-      "enabled": false,
-      "applied_io_worker_checked": true,
-      "ordinary_join_checked": true,
-      "shared_future_preserved": true,
-      "exception_identity_checked": true,
-      "completed_interrupt_checked": true,
-      "cancelled_completion_checked": true,
-      "preinterrupted_pending_checked": true
-    },
-    {
-      "enabled": true,
-      "applied_io_worker_checked": true,
-      "ordinary_join_checked": true,
-      "shared_future_preserved": true,
-      "exception_identity_checked": true,
-      "completed_interrupt_checked": true,
-      "cancelled_completion_checked": true,
-      "preinterrupted_pending_checked": true
-    }
-  ],
-  "notes": [
-    "Actual game IOWorker under Fabric, with controlled cached blending-read futures.",
-    "DH worker interruption releases only its waiter; the shared future remains consumable.",
-    "Ordinary callers retain join behavior; completed values, cancellation and exception identity are checked.",
-    "This is a shutdown correctness fixture, not an FPS or world-generation throughput benchmark."
-  ],
-  "provenance": {
-    "source_commit": "9a1b22aa56f58a3ee39a3564be859a662d2beedc",
-    "workflow_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37166150119",
-    "job": "portable-mod (ubuntu-latest)",
-    "artifact": "horizon-ubuntu-latest",
-    "command": "python tools/test_terrain_read.py"
-  }
-}

benchmarks/terrain-read-2026-10-04/local-applied-hooks.json

@@ -1,41 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-7.0.0-31-generic-x86_64-with-glibc2.43",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "original_mod_sha256": "c506982631880604513de8ef85e3b4461fbb898702e60b4a6f74ca3b3d4a687f",
-  "results": [
-    {
-      "enabled": false,
-      "applied_io_worker_checked": true,
-      "ordinary_join_checked": true,
-      "shared_future_preserved": true,
-      "exception_identity_checked": true,
-      "completed_interrupt_checked": true,
-      "cancelled_completion_checked": true,
-      "preinterrupted_pending_checked": true
-    },
-    {
-      "enabled": true,
-      "applied_io_worker_checked": true,
-      "ordinary_join_checked": true,
-      "shared_future_preserved": true,
-      "exception_identity_checked": true,
-      "completed_interrupt_checked": true,
-      "cancelled_completion_checked": true,
-      "preinterrupted_pending_checked": true
-    }
-  ],
-  "notes": [
-    "Actual game IOWorker under Fabric, with controlled cached blending-read futures.",
-    "DH worker interruption releases only its waiter; the shared future remains consumable.",
-    "Ordinary callers retain join behavior; completed values, cancellation and exception identity are checked.",
-    "This is a shutdown correctness fixture, not an FPS or world-generation throughput benchmark."
-  ],
-  "provenance": {
-    "source_commit": "9a1b22aa56f58a3ee39a3564be859a662d2beedc",
-    "environment": "local Linux x64 software graphics; actual Fabric fixture",
-    "command": "python tools/test_terrain_read.py"
-  }
-}

benchmarks/tick-membership-2026-10-04/linux-applied-hooks.json

@@ -1,41 +0,0 @@
-{
-  "schema": 1,
-  "platform": "Linux-6.17.0-1022-azure-x86_64-with-glibc2.39",
-  "architecture": "x86_64",
-  "minecraft": "26.3",
-  "distant_horizons": "3.3.4",
-  "results": [
-    {
-      "enabled": false,
-      "allocated_bytes": 245760208,
-      "cpu_ns": 423649902,
-      "wall_ns": 481491629,
-      "nodes_per_tick": 512,
-      "measured_ticks": 20000,
-      "verified_transitions": 6000,
-      "checksum": 10240000
-    },
-    {
-      "enabled": true,
-      "allocated_bytes": 208,
-      "cpu_ns": 185922780,
-      "wall_ns": 192151484,
-      "nodes_per_tick": 512,
-      "measured_ticks": 20000,
-      "verified_transitions": 6000,
-      "checksum": 10240000
-    }
-  ],
-  "notes": [
-    "Actual publisher tick holder under Fabric, warmed with preallocated nodes and a reused action list.",
-    "Checks duplicate/null membership, enable/disable precedence, published iteration order and clear boundaries.",
-    "Only private membership checks change; action collections and traversal remain upstream.",
-    "CPU and allocation measure the calling thread in one isolated loop; no statistical speed claim.",
-    "Not a game FPS, visible terrain completion, whole-game RAM or Mac GPU benchmark."
-  ],
-  "provenance": {
-    "source_commit": "e091816ce06686d64d0f7a181a42701aa67e5bf7",
-    "ci_run": "https://github.com/ludovic111/minecraft-optimization-lab/actions/runs/37162939262",
-    "artifact": "horizon-ubuntu-latest"
-  }
-}

benchmarks/worker-pacing-2026-10-03/macos-26.txt

@@ -1,14 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Darwin 25.6.0 arm64; logical CPUs 3
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.346; 1643.771 ms; worker allocation 1403064 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.514; 1061.526 ms; worker allocation 15456 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.466; 1238.603 ms; worker allocation 1449704 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.063; 11385.730 ms; worker allocation 204024 bytes
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.703; 785.293 ms; worker allocation 1417064 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.509; 1097.416 ms; worker allocation 14496 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.431; 1293.360 ms; worker allocation 1529184 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.065; 10727.658 ms; worker allocation 198104 bytes
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.620; 896.747 ms; worker allocation 1490864 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.518; 1062.565 ms; worker allocation 13096 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.605; 975.086 ms; worker allocation 1450064 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.060; 11976.557 ms; worker allocation 196840 bytes

benchmarks/worker-pacing-2026-10-03/ubuntu-latest.txt

@@ -1,14 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Linux 6.17.0-1022-azure x86_64; logical CPUs 4
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 1.000; 578.014 ms; worker allocation 1450616 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.525; 1041.454 ms; worker allocation 64976 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.976; 591.683 ms; worker allocation 1451744 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.076; 10349.493 ms; worker allocation 145264 bytes
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 1.000; 577.632 ms; worker allocation 1451096 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.523; 1043.863 ms; worker allocation 65120 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.977; 591.337 ms; worker allocation 1410264 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.076; 10334.845 ms; worker allocation 124264 bytes
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.987; 583.777 ms; worker allocation 1490096 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.524; 1038.102 ms; worker allocation 64656 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.952; 606.495 ms; worker allocation 1408464 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.076; 10346.209 ms; worker allocation 165856 bytes

benchmarks/worker-pacing-2026-10-03/windows-latest.txt

@@ -1,14 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
-Platform Windows 2025Server AMD64; logical CPUs 4
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.952; 557.784 ms; worker allocation 1491496 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.556; 1038.982 ms; worker allocation 17776 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.852; 623.419 ms; worker allocation 1410384 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.078; 10247.387 ms; worker allocation 214896 bytes
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.998; 548.088 ms; worker allocation 1489616 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.574; 1034.032 ms; worker allocation 15096 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.867; 630.903 ms; worker allocation 1449664 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.078; 10266.232 ms; worker allocation 214904 bytes
-upstream requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.996; 549.301 ms; worker allocation 1448456 bytes
-precise requested ratio 0.500; 50000 tasks of 10000 ns; worker CPU/wall 0.452; 1036.321 ms; worker allocation 13776 bytes
-upstream requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.971; 563.129 ms; worker allocation 1409664 bytes
-precise requested ratio 0.050; 50000 tasks of 10000 ns; worker CPU/wall 0.100; 10276.324 ms; worker allocation 214744 bytes

crates/horizon-client/Cargo.toml

@@ -22,6 +22,8 @@ serde_json = { version = "1.0.151", features = ["raw_value"] }
 cpal = "0.16"
 symphonia = { version = "0.5", default-features = false, features = ["ogg", "vorbis"] }
 miniz_oxide = "0.8"
+ab_glyph = "0.2.32"
+horizon-theme = { path = "../horizon-theme" }
 
 [features]
 # Records the call sites of mob random draws (`mob_ai_probe` traces).

crates/horizon-client/examples/chat_screen_fixture.rs

@@ -0,0 +1,132 @@
+//! The chat screen's input for tools/test_chat_screen_parity.py: reads one
+//! JSON case per line (GUI size, history, options, typed text, keys,
+//! clicks, mouse), runs `horizon_client::chat::ChatScreen` on the vanilla
+//! command tree and writes the input's state and the screen's GUI calls in
+//! the oracle's JSON form.
+//!
+//! usage: chat_screen_fixture RESOURCES REGISTRIES CASES OUTPUT
+use horizon_client::{
+    chat::{ChatAction, ChatScreen, Commands},
+    command::vanilla,
+    hud::HudAtlas,
+    lang,
+    screen_draw::Measure,
+};
+use serde_json::{Value, json};
+use std::{fmt::Write as _, fs, path::PathBuf};
+use winit::keyboard::KeyCode as K;
+#[path = "pack_screen_fixture.rs"]
+#[allow(dead_code)]
+mod pack_screen_fixture;
+#[path = "chat_screen_fixture/registries.rs"]
+mod registries;
+
+fn main() -> horizon_client::Result<()> {
+    let args: Vec<PathBuf> = std::env::args_os().skip(1).map(PathBuf::from).collect();
+    let [root, registries, inputs, output] = args.as_slice() else {
+        return Err("usage: chat_screen_fixture RESOURCES REGISTRIES CASES OUTPUT".into());
+    };
+    let atlas = HudAtlas::build(root)?;
+    lang::set(lang::Language::load(&[root], lang::DEFAULT));
+    let m = Measure(&atlas.font);
+    let reg = registries::registries(&serde_json::from_slice(&fs::read(registries)?)?, 4);
+    let c = Commands {
+        dispatcher: vanilla::release_dispatcher(),
+        registries: &reg,
+    };
+    let mut out = String::new();
+    for line in fs::read_to_string(inputs)?
+        .lines()
+        .filter(|l| !l.is_empty())
+    {
+        let case: Value = serde_json::from_str(line)?;
+        let int = |v: &Value| v.as_i64().unwrap_or(0) as i32;
+        let history: Vec<String> = case["history"]
+            .as_array()
+            .into_iter()
+            .flatten()
+            .filter_map(|s| s.as_str().map(str::to_owned))
+            .collect();
+        let (w, h) = (int(&case["width"]), int(&case["height"]));
+        let mut screen = ChatScreen::new(
+            &m,
+            &c,
+            case["initial"].as_str().unwrap_or(""),
+            history.len(),
+            w,
+            h,
+        );
+        screen.auto_suggestions = case["autoSuggest"] == true;
+        let mut closed = false;
+        for a in case["actions"].as_array().into_iter().flatten() {
+            match a["type"].as_str().unwrap_or_default() {
+                "type" => screen.type_text(&m, &c, a["text"].as_str().unwrap_or_default()),
+                "click" => {
+                    screen.click(
+                        &m,
+                        &c,
+                        a["x"].as_f64().unwrap_or(0.0),
+                        a["y"].as_f64().unwrap_or(0.0),
+                    );
+                }
+                "key" => {
+                    let mut name = a["key"].as_str().unwrap_or_default();
+                    let (mut shift, mut ctrl) = (false, false);
+                    loop {
+                        if let Some(n) = name.strip_prefix("shift+") {
+                            shift = true;
+                            name = n;
+                        } else if let Some(n) = name.strip_prefix("ctrl+") {
+                            ctrl = true;
+                            name = n;
+                        } else {
+                            break;
+                        }
+                    }
+                    let key = match name {
+                        "backspace" => K::Backspace,
+                        "delete" => K::Delete,
+                        "home" => K::Home,
+                        "end" => K::End,
+                        "right" => K::ArrowRight,
+                        "left" => K::ArrowLeft,
+                        "down" => K::ArrowDown,
+                        "up" => K::ArrowUp,
+                        "tab" => K::Tab,
+                        "escape" => K::Escape,
+                        _ => K::KeyA,
+                    };
+                    // InputQuirks.EDIT_SHORTCUT_KEY_MODIFIER: Cmd, not Ctrl, on macOS.
+                    let ctrl = ctrl && !cfg!(target_os = "macos");
+                    if screen.key(&m, &c, &history, key, shift, ctrl) != ChatAction::None {
+                        closed = true;
+                        break;
+                    }
+                }
+                _ => {}
+            }
+        }
+        if closed {
+            writeln!(out, "{}", json!({"closed": true}))?;
+            continue;
+        }
+        // Options.getBackgroundColor(Integer.MIN_VALUE).
+        let background = if case["chatOnly"] == true {
+            i32::MIN
+        } else {
+            let a = (case["opacity"].as_f64().unwrap_or(0.0) as f32 * 255.0).floor() as i32;
+            a << 24
+        };
+        let mouse = (int(&case["mouse"][0]), int(&case["mouse"][1]));
+        let draws = screen.draw(&m, mouse, case["blink"].as_u64().unwrap_or(0), background);
+        let input = &screen.input;
+        writeln!(
+            out,
+            "{}",
+            json!({"value": input.value, "cursor": input.cursor, "highlight": input.highlight, "display": input.display,
+                   "draws": pack_screen_fixture::encode(&draws)})
+        )?;
+    }
+    fs::write(output, out)?;
+    Ok(())
+}

crates/horizon-client/examples/chat_screen_fixture/registries.rs

@@ -0,0 +1,85 @@
+//! The registries VanillaCommandParseOracle exports (`registries` mode), as
+//! the command dispatcher reads them; shared by the command fixtures.
+use horizon_client::command::{Registries, args::RegistryIds};
+use serde_json::Value;
+
+fn strings(v: &Value) -> Vec<String> {
+    v.as_array()
+        .map(|a| {
+            a.iter()
+                .filter_map(|x| x.as_str().map(str::to_owned))
+                .collect()
+        })
+        .unwrap_or_default()
+}
+
+pub fn registries(r: &Value, permission: u8) -> Registries {
+    let mut reg = Registries {
+        permission,
+        ..Registries::default()
+    };
+    reg.items = strings(&r["items"]);
+    reg.item_tags = strings(&r["item_tags"]);
+    reg.block_tags = strings(&r["block_tags"]);
+    for (id, props) in r["blocks"].as_object().into_iter().flatten() {
+        let props = props
+            .as_array()
+            .into_iter()
+            .flatten()
+            .map(|p| (p[0].as_str().unwrap_or("").to_owned(), strings(&p[1])))
+            .collect();
+        reg.blocks.insert(id.clone(), props);
+    }
+    reg.summonable = strings(&r["summonable"]);
+    reg.entity_types = strings(&r["entity_types"]);
+    reg.effects = strings(&r["effects"]);
+    reg.attributes = strings(&r["attributes"]);
+    reg.sounds = strings(&r["sounds"]);
+    reg.enchantments = strings(&r["enchantments"]);
+    reg.structures = strings(&r["structures"]);
+    reg.biomes = strings(&r["biomes"]);
+    reg.damage_types = strings(&r["damage_types"]);
+    reg.clocks = strings(&r["clocks"]);
+    reg.timelines = strings(&r["timelines"]);
+    reg.dimensions = strings(&r["dimensions"]);
+    reg.players = strings(&r["players"]);
+    reg.teams = strings(&r["teams"]);
+    reg.objectives = strings(&r["objectives"]);
+    reg.tracked = strings(&r["tracked"]);
+    for (name, entry) in r["by_registry"].as_object().into_iter().flatten() {
+        reg.by_registry.insert(
+            name.clone(),
+            RegistryIds {
+                ids: strings(&entry["ids"]),
+                tags: strings(&entry["tags"]),
+            },
+        );
+    }
+    reg.block_entities = strings(&r["block_entities"]).into_iter().collect();
+    for (tag, members) in r["block_tag_members"].as_object().into_iter().flatten() {
+        reg.block_tag_members.insert(tag.clone(), strings(members));
+    }
+    reg.templates = strings(&r["templates"]);
+    reg.persistent_components = strings(&r["persistent_components"]);
+    reg.learnable_recipes = strings(&r["learnable_recipes"]);
+    for (clock, markers) in r["clock_time_markers"].as_object().into_iter().flatten() {
+        reg.clock_time_markers
+            .insert(clock.clone(), strings(markers));
+    }
+    for (id, criteria) in r["advancement_criteria"].as_object().into_iter().flatten() {
+        reg.advancement_criteria
+            .insert(id.clone(), strings(criteria));
+    }
+    reg.datapacks_enabled = strings(&r["datapacks_selected"]);
+    let enabled = reg.datapacks_enabled.clone();
+    reg.datapacks_disabled = strings(&r["datapacks_enableable"])
+        .into_iter()
+        .filter(|p| !enabled.contains(p))
+        .collect();
+    reg.advancements = reg.ids("minecraft:advancement").to_vec();
+    reg.recipes = reg.ids("minecraft:recipe").to_vec();
+    reg.loot_tables = reg.ids("minecraft:loot_table").to_vec();
+    reg.predicates = reg.ids("minecraft:predicate").to_vec();
+    reg.item_modifiers = reg.ids("minecraft:item_modifier").to_vec();
+    reg
+}

crates/horizon-client/examples/ghost_recipe_fixture.rs

@@ -0,0 +1,73 @@
+//! The ghost recipe a recipe book click fades into the menu, for
+//! tools/test_ghost_recipe_parity.py: reads one JSON case per line (menu, recipe
+//! id, the stack in the furnace's fuel slot) and prints, for every display of
+//! the recipe, the slots `Book::ghost` fills and the stacks each cycles through.
+//!
+//! usage: ghost_recipe_fixture RESOURCES CASES OUTPUT
+use horizon_client::{
+    crafting::Recipes,
+    item_data::{canon_stack, parse_stack},
+    items::Items,
+    recipe_book::{Book, BookType, GhostTarget, RecipeIndex},
+};
+use serde_json::Value;
+use std::{fmt::Write as _, fs, path::Path};
+
+fn main() -> horizon_client::Result<()> {
+    let args: Vec<String> = std::env::args().collect();
+    let usage = "usage: ghost_recipe_fixture RESOURCES CASES OUTPUT";
+    let root = Path::new(args.get(1).ok_or(usage)?);
+    let cases = fs::read_to_string(args.get(2).ok_or(usage)?)?;
+    let items = Items::catalog(root)?;
+    let recipes = Recipes::load(root, &items)?;
+    let index = RecipeIndex::load(root);
+    let mut book = Book::build(&recipes, &items);
+    book.set_display_ids(&index);
+    let mut out = String::new();
+    for line in cases.lines() {
+        let case: Value = serde_json::from_str(line)?;
+        let menu = case["menu"].as_str().unwrap_or_default();
+        let id = case["recipe"].as_str().unwrap_or_default();
+        let (book_type, grid) = match menu {
+            "inventory" => (BookType::Crafting, 2),
+            "crafting" => (BookType::Crafting, 3),
+            "furnace" => (BookType::Furnace, 0),
+            "blast_furnace" => (BookType::BlastFurnace, 0),
+            _ => (BookType::Smoker, 0),
+        };
+        let fuel = match case["fuel"].as_str() {
+            Some(s) => parse_stack(s)?,
+            None => None,
+        };
+        for entry in book.entries.iter().filter(|e| e.id == id) {
+            let crafting = book_type == BookType::Crafting;
+            let is_furnace = matches!(
+                entry.display,
+                horizon_client::recipe_book::Display::Furnace(_)
+            );
+            if is_furnace == crafting || (crafting && !entry.fits(grid, grid)) {
+                out.push_str("skip | ");
+                continue;
+            }
+            for slot in book.ghost(entry, book_type, grid, fuel.is_none(), &items) {
+                let (index, result) = match slot.target {
+                    GhostTarget::Result => (if crafting { 0 } else { 2 }, true),
+                    GhostTarget::Grid(i) => (1 + i, false),
+                    GhostTarget::Input => (0, false),
+                    GhostTarget::Fuel => (1, false),
+                };
+                let stacks: Vec<String> = slot.items.iter().map(|s| canon_stack(Some(s))).collect();
+                let _ = write!(
+                    out,
+                    "{index}{}={} ",
+                    if result { "R" } else { "I" },
+                    stacks.join(",")
+                );
+            }
+            out.push_str("| ");
+        }
+        out.push('\n');
+    }
+    fs::write(args.get(3).ok_or(usage)?, out)?;
+    Ok(())
+}

crates/horizon-client/examples/hotbar_fixture.rs

@@ -0,0 +1,42 @@
+//! Creative toolbars read through the data fixers, for
+//! tools/test_hotbar_parity.py: reads one JSON case per line (the SNBT of a
+//! `hotbar.nbt`, or null for a missing file) and prints the stacks of the nine
+//! rows after `horizon_client::hotbar::from_tag`.
+//!
+//! usage: hotbar_fixture RESOURCES CASES OUTPUT
+use horizon_client::{hotbar, item_data::canon_stack, items::Items};
+use horizon_world::nbt::{Tag, parse_snbt};
+use serde_json::Value;
+use std::path::Path;
+use std::{fmt::Write as _, fs};
+
+fn main() -> horizon_client::Result<()> {
+    let args: Vec<String> = std::env::args().collect();
+    let usage = "usage: hotbar_fixture RESOURCES CASES OUTPUT";
+    let items = Items::catalog(Path::new(args.first().and(args.get(1)).ok_or(usage)?))?;
+    let known = |id: &str| items.get(id).is_some();
+    let cases = fs::read_to_string(args.get(2).ok_or(usage)?)?;
+    let mut out = String::new();
+    for line in cases.lines() {
+        let case: Value = serde_json::from_str(line)?;
+        let rows = match case["snbt"].as_str() {
+            Some(text) => match parse_snbt(text) {
+                Ok((tag @ Tag::Compound(_), _)) => hotbar::from_tag(tag, &known),
+                _ => return Err("case snbt".into()),
+            },
+            None => (0..hotbar::GROUPS)
+                .map(|_| vec![None; hotbar::SIZE])
+                .collect(),
+        };
+        for (i, row) in rows.iter().enumerate() {
+            let _ = write!(out, "{i}:");
+            for stack in row {
+                let _ = write!(out, " {}", canon_stack(stack.as_ref()));
+            }
+            out.push_str(" | ");
+        }
+        out.push('\n');
+    }
+    fs::write(args.get(3).ok_or(usage)?, out)?;
+    Ok(())
+}

crates/horizon-client/examples/hud_fixture/kinds.rs

@@ -322,5 +322,9 @@ fn chat(c: &Value, h: i32, atlas: &HudAtlas) -> Vec<GuiDraw> {
             false,
         );
     }
-    chat.layout(h, c["now"].as_u64().unwrap_or(0), false)
+    let focused = c["focused"].as_bool().unwrap_or(false);
+    if let Some(n) = c["scroll"].as_i64() {
+        chat.scroll_by(n as i32, focused);
+    }
+    chat.layout(h, c["now"].as_u64().unwrap_or(0), focused)
 }

crates/horizon-client/examples/mob_ai_probe.rs

@@ -10,7 +10,7 @@ use horizon_client::{
     chunk::{Chunk, HEIGHT, MIN_Y},
     collisions,
     containers::{BlockEntity, CreakingHeart},
-    items::Items,
+    items::{ItemStack, Items},
     light::{LightTables, light_chunk},
     mobs::{
         Damage, MobType, creaking,
@@ -87,7 +87,9 @@ fn parse(text: &str) -> Vec<Scenario> {
                 }
             }
             "origin" => s.origin = [f[1].parse().unwrap(), f[2].parse().unwrap()],
-            "fill" | "block" => s.blocks.push(f.iter().map(|x| (*x).to_owned()).collect()),
+            "fill" | "block" | "chest" => {
+                s.blocks.push(f.iter().map(|x| (*x).to_owned()).collect())
+            }
             "heart" => s.hearts.push(f.iter().map(|x| (*x).to_owned()).collect()),
             "hurt" => s.hurts.push((f[1].parse().unwrap(), f[2].parse().unwrap())),
             "player" => {
@@ -575,6 +577,14 @@ fn print(out: &mut String, t: i32, i: usize, m: &Mob, player_down: bool) {
     if m.species() == Species::Villager {
         let _ = write!(out, "\tvx {}", villager(m));
     }
+    if m.species() == Species::CopperGolem {
+        let held = horizon_client::mobs::transport_items::held(m).map_or("-".into(), stack);
+        let opened = m
+            .extra
+            .opened_chest
+            .map_or("-".into(), |p| format!("{},{},{}", p[0], p[1], p[2]));
+        let _ = write!(out, "\tcg {} {held} {opened}", m.extra.variant3);
+    }
     out.push('\n');
 }
 
@@ -712,8 +722,23 @@ fn main() -> horizon_client::Result<()> {
         }
         for b in &s.blocks {
             let n = |i: usize| b[i].parse::<i32>().unwrap();
-            if b[0] == "block" {
+            if b[0] == "block" || b[0] == "chest" {
                 world.set(n(1), n(2), n(3), state(registry, &b[4]))?;
+                if b[0] == "chest" {
+                    // chest X Y Z STATE SLOTS: item*count or - per slot.
+                    let mut slots = vec![None; 27];
+                    for (k, item) in b.get(5).map_or("", String::as_str).split(',').enumerate() {
+                        if let Some((id, count)) = item.split_once('*') {
+                            slots[k] = Some(ItemStack::new(
+                                &format!("minecraft:{id}"),
+                                count.parse().unwrap(),
+                            ));
+                        }
+                    }
+                    world
+                        .block_entities
+                        .insert((n(1), n(2), n(3)), BlockEntity::Chest(slots));
+                }
             } else {
                 let st = state(registry, &b[7]);
                 for x in n(1).min(n(4))..=n(1).max(n(4)) {
@@ -788,6 +813,14 @@ fn main() -> horizon_client::Result<()> {
                     "tame" => m.extra.tame = true,
                     x if x.starts_with("age=") => m.extra.age = x[4..].parse().unwrap(),
                     x if x.starts_with("strength=") => m.extra.variant2 = x[9..].parse().unwrap(),
+                    x if x.starts_with("hand=") => {
+                        let (id, count) = x[5..].split_once('*').unwrap();
+                        let stack =
+                            ItemStack::new(&format!("minecraft:{id}"), count.parse().unwrap());
+                        horizon_client::mobs::transport_items::set_held(&mut m, Some(stack));
+                    }
+                    // Set once the brain exists (below).
+                    x if x.starts_with("cooldown=") => {}
                     "leashed" => m.extra.leash = Some(horizon_client::mobs::leash::Holder::Player),
                     x if x.starts_with("leashto=") => {
                         let n: u32 = x[8..].parse().unwrap();
@@ -820,6 +853,12 @@ fn main() -> horizon_client::Result<()> {
             if horizon_client::mobs::animal_brain::kind_of(&m).is_some() {
                 horizon_client::mobs::animal_brain::init(&mut m, spec.seed);
             }
+            if let Some(c) = spec.flags.iter().find_map(|f| f.strip_prefix("cooldown=")) {
+                horizon_client::mobs::animal_brain::set_transport_cooldown(
+                    &mut m,
+                    c.parse().unwrap(),
+                );
+            }
             mobs.push(m);
         }
         // Without a player of its own a scenario still has the oracle's,
@@ -883,6 +922,7 @@ fn main() -> horizon_client::Result<()> {
                     world_seed: 0,
                     // FlatLevelSource.getSeaLevel.
                     sea_level: -63,
+                    items: Some(&items),
                 }
             };
         }
@@ -1013,6 +1053,36 @@ fn main() -> horizon_client::Result<()> {
                     }
                     k += 1;
                 }
+                // What a copper golem did to chests, before the next mob ticks.
+                for e in &events[from.min(events.len())..] {
+                    match e {
+                        MobEvent::ChestOpen { chest, open } => {
+                            let o = world
+                                .chest_openers
+                                .entry((chest[0], chest[1], chest[2]))
+                                .or_insert((0, 0.0));
+                            if *open {
+                                o.0 += 1;
+                                o.1 = o.1.max(3.0);
+                            } else {
+                                o.0 -= 1;
+                                if o.0 == 0 {
+                                    o.1 = 0.0;
+                                }
+                            }
+                        }
+                        MobEvent::ChestSlot { chest, slot, stack } => {
+                            if let Some(e) = world
+                                .block_entities
+                                .get_mut(&(chest[0], chest[1], chest[2]))
+                                && let Some(sl) = e.slots_mut().get_mut(*slot)
+                            {
+                                *sl = stack.clone();
+                            }
+                        }
+                        _ => {}
+                    }
+                }
                 // ServerLevel ticks entities one after another: the ones
                 // after this mob see it as it is now.
                 if let Some(e) = snapshot.iter_mut().find(|e| e.id == mobs[i].id) {
@@ -1092,6 +1162,34 @@ fn main() -> horizon_client::Result<()> {
             for (at, h) in &hearts {
                 print_heart(&mut out, t, registry, &world, *at, h, &scratch);
             }
+            for b in s.blocks.iter().filter(|b| b[0] == "chest") {
+                let n = |i: usize| b[i].parse::<i32>().unwrap();
+                let key = (n(1), n(2), n(3));
+                let Some(e) = world.block_entities.get(&key) else {
+                    continue;
+                };
+                let mut slots: Vec<String> = e
+                    .slots()
+                    .iter()
+                    .map(|s| s.as_ref().map_or("-".into(), stack))
+                    .collect();
+                while slots.last().is_some_and(|s| s == "-") {
+                    slots.pop();
+                }
+                let count = world.chest_openers.get(&key).map_or(0, |o| o.0);
+                let _ = writeln!(
+                    out,
+                    "{t} chest {},{},{} {} {count}",
+                    key.0 - s.origin[0],
+                    key.1,
+                    key.2 - s.origin[1],
+                    if slots.is_empty() {
+                        "-".into()
+                    } else {
+                        slots.join(",")
+                    }
+                );
+            }
             for line in traces {
                 let _ = writeln!(out, "{line}");
             }

crates/horizon-client/examples/pack_screen_fixture.rs

@@ -0,0 +1,163 @@
+//! The resource pack screen for tools/test_pack_screen_parity.py: reads one
+//! JSON case per line (packs, selection, GUI size, actions, mouse), runs
+//! `horizon_client::pack_screen` through the actions and writes the shown
+//! screen's GUI calls in the oracle's JSON form.
+//!
+//! usage: pack_screen_fixture RESOURCES CASES OUTPUT
+use horizon_client::{
+    hud::HudAtlas,
+    lang,
+    pack_screen::{Compat, PackInfo, PackScreen, Source},
+    packs::{self, Position},
+    screen_draw::{Draw, Measure},
+    text::Text,
+};
+use serde_json::{Value, json};
+use std::{fmt::Write as _, fs, path::PathBuf};
+
+/// Styled runs: [text, rgb or null, bold, italic, underlined, strikethrough, obfuscated].
+pub fn runs(t: &Text) -> Value {
+    let mut out: Vec<(String, Option<u32>, [bool; 5])> = Vec::new();
+    for (c, s) in t.chars() {
+        let f = [
+            s.bold,
+            s.italic,
+            s.underlined,
+            s.strikethrough,
+            s.obfuscated,
+        ]
+        .map(|b| b == Some(true));
+        match out.last_mut() {
+            Some(last) if last.1 == s.color && last.2 == f => last.0.push(c),
+            _ => out.push((c.to_string(), s.color, f)),
+        }
+    }
+    Value::Array(
+        out.into_iter()
+            .map(|(t, c, f)| json!([t, c, f[0], f[1], f[2], f[3], f[4]]))
+            .collect(),
+    )
+}
+pub fn encode(draws: &[Draw]) -> Value {
+    Value::Array(
+        draws
+            .iter()
+            .map(|d| match d {
+                Draw::Sprite { sprite, x, y, w, h, color } => {
+                    json!({"type": "sprite", "sprite": sprite, "x": x, "y": y, "w": w, "h": h, "color": color})
+                }
+                Draw::Blit { texture, x, y, w, h, u, v, src, tex, color } => json!({"type": "blit", "texture": texture,
+                    "x": x, "y": y, "w": w, "h": h, "u": u, "v": v, "srcW": src[0], "srcH": src[1], "texW": tex[0],
+                    "texH": tex[1], "color": color}),
+                Draw::Fill { x0, y0, x1, y1, color } => {
+                    json!({"type": "fill", "x0": x0, "y0": y0, "x1": x1, "y1": y1, "color": color})
+                }
+                Draw::Highlight { x0, y0, x1, y1 } => json!({"type": "highlight", "x0": x0, "y0": y0, "x1": x1, "y1": y1}),
+                Draw::Text { text, x, y, color, shadow } => {
+                    json!({"type": "text", "runs": runs(text), "x": x, "y": y, "color": color, "shadow": shadow})
+                }
+                Draw::Scissor { x0, y0, x1, y1 } => json!({"type": "scissor", "x0": x0, "y0": y0, "x1": x1, "y1": y1}),
+                Draw::NoScissor => json!({"type": "noscissor"}),
+                Draw::Tooltip { lines, x, y } => {
+                    json!({"type": "tooltip", "lines": lines.iter().map(runs).collect::<Vec<_>>(), "x": x, "y": y})
+                }
+            })
+            .collect(),
+    )
+}
+
+fn main() -> horizon_client::Result<()> {
+    let args: Vec<PathBuf> = std::env::args_os().skip(1).map(PathBuf::from).collect();
+    let [root, inputs, output] = args.as_slice() else {
+        return Err("usage: pack_screen_fixture RESOURCES CASES OUTPUT".into());
+    };
+    let atlas = HudAtlas::build(root)?;
+    lang::set(lang::Language::load(&[root], lang::DEFAULT));
+    let m = Measure(&atlas.font);
+    let mut out = String::new();
+    for line in fs::read_to_string(inputs)?
+        .lines()
+        .filter(|l| !l.is_empty())
+    {
+        let c: Value = serde_json::from_str(line)?;
+        let int = |v: &Value| v.as_i64().unwrap_or(0) as i32;
+        let packs: Vec<PackInfo> = c["packs"]
+            .as_array()
+            .into_iter()
+            .flatten()
+            .map(|p| {
+                let (description, description_style) = packs::component_root(&p["description"]);
+                PackInfo {
+                    id: p["id"].as_str().unwrap_or_default().to_owned(),
+                    title: packs::component_root(&p["title"]).0,
+                    description,
+                    description_style,
+                    source: match p["source"].as_str() {
+                        Some("builtin") => Source::BuiltIn,
+                        Some("world") => Source::World,
+                        Some("server") => Source::Server,
+                        Some("feature") => Source::Feature,
+                        _ => Source::Default,
+                    },
+                    compat: match p["compat"].as_str() {
+                        Some("old") => Compat::TooOld,
+                        Some("new") => Compat::TooNew,
+                        Some("unknown") => Compat::Unknown,
+                        _ => Compat::Compatible,
+                    },
+                    icon: p["icon"].as_bool().unwrap_or(false),
+                    required: p["required"].as_bool().unwrap_or(false),
+                    position: if p["position"] == "top" {
+                        Position::Top
+                    } else {
+                        Position::Bottom
+                    },
+                    fixed: p["fixed"].as_bool().unwrap_or(false),
+                }
+            })
+            .collect();
+        let selected: Vec<String> = c["selected"]
+            .as_array()
+            .into_iter()
+            .flatten()
+            .filter_map(|s| s.as_str().map(str::to_owned))
+            .collect();
+        let mut screen = PackScreen::new(
+            &m,
+            int(&c["width"]),
+            int(&c["height"]),
+            c["inWorld"] == true,
+            packs,
+            &selected,
+        );
+        for a in c["actions"].as_array().into_iter().flatten() {
+            let f = |k: &str| a[k].as_f64().unwrap_or(0.0);
+            match a["type"].as_str().unwrap_or_default() {
+                "click" => {
+                    screen.click(&m, f("x"), f("y"));
+                }
+                "scroll" => screen.scroll(f("x"), f("y"), f("amount")),
+                "type" => screen.type_text(&m, a["text"].as_str().unwrap_or_default()),
+                "erase" => screen.erase(&m, f("count") as isize),
+                _ => {}
+            }
+            if std::env::var_os("PACK_DEBUG").is_some() {
+                eprintln!("{a} -> {}", screen.debug());
+            }
+        }
+        let mouse = (int(&c["mouse"][0]), int(&c["mouse"][1]));
+        let draws = screen.draw(&m, mouse, c["blink"].as_u64().unwrap_or(0));
+        let screen_name = if screen.confirming() {
+            "confirm"
+        } else {
+            "packs"
+        };
+        writeln!(
+            out,
+            "{}",
+            json!({"screen": screen_name, "draws": encode(&draws)})
+        )?;
+    }
+    fs::write(output, out)?;
+    Ok(())
+}

crates/horizon-client/examples/pack_selection_fixture.rs

@@ -0,0 +1,100 @@
+//! Headless transport for the pack selection parity gate: builds each
+//! case's `horizon_client::packs::SelectionModel`, applies its actions and
+//! writes both lists with each entry's select/unselect/move flags after
+//! every action, and the committed selection.
+#![forbid(unsafe_code)]
+use horizon_client::packs::{Position, Selectable, SelectionModel};
+use serde_json::{Value, json};
+use std::{
+    fs,
+    io::{BufWriter, Write},
+    path::PathBuf,
+};
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+fn lists(m: &SelectionModel) -> Value {
+    let side = |selected: bool| -> Value {
+        let list = if selected { &m.selected } else { &m.unselected };
+        (0..list.len())
+            .map(|i| {
+                let mut flags = String::new();
+                for (on, c) in [
+                    (m.can_select(selected, i), 's'),
+                    (m.can_unselect(selected, i), 'u'),
+                    (m.can_move_up(selected, i), '^'),
+                    (m.can_move_down(selected, i), 'v'),
+                ] {
+                    if on {
+                        flags.push(c);
+                    }
+                }
+                json!([list[i].id, flags])
+            })
+            .collect()
+    };
+    json!({"unselected": side(false), "selected": side(true)})
+}
+
+fn main() -> Result<()> {
+    let args: Vec<PathBuf> = std::env::args_os().skip(1).map(PathBuf::from).collect();
+    let [inputs, output] = args.as_slice() else {
+        return Err("usage: pack_selection_fixture INPUTS OUTPUT".into());
+    };
+    let mut out = BufWriter::new(fs::File::create(output)?);
+    for line in fs::read_to_string(inputs)?
+        .lines()
+        .filter(|l| !l.is_empty())
+    {
+        let c: Value = serde_json::from_str(line)?;
+        let packs = c["packs"]
+            .as_array()
+            .into_iter()
+            .flatten()
+            .map(|p| Selectable {
+                id: p["id"].as_str().unwrap_or("").to_owned(),
+                required: p["required"].as_bool().unwrap_or(false),
+                position: if p["position"] == "top" {
+                    Position::Top
+                } else {
+                    Position::Bottom
+                },
+                fixed: p["fixed"].as_bool().unwrap_or(false),
+                compatible: p["compat"] == "compatible",
+            })
+            .collect();
+        let selected: Vec<String> = c["selected"]
+            .as_array()
+            .into_iter()
+            .flatten()
+            .filter_map(|s| s.as_str().map(str::to_owned))
+            .collect();
+        let mut m = SelectionModel::new(packs, &selected);
+        let mut steps = vec![lists(&m)];
+        for op in c["ops"].as_array().into_iter().flatten() {
+            let sel = op["list"] == "selected";
+            let len = if sel {
+                m.selected.len()
+            } else {
+                m.unselected.len()
+            };
+            if len > 0 {
+                let i = op["index"].as_i64().unwrap_or(0).rem_euclid(len as i64) as usize;
+                match op["op"].as_str() {
+                    Some("activate") => {
+                        m.activate(sel, i, op["confirm"].as_bool().unwrap_or(false));
+                    }
+                    Some("up") => {
+                        m.move_by(sel, i, true);
+                    }
+                    Some("down") => {
+                        m.move_by(sel, i, false);
+                    }
+                    _ => return Err(format!("unknown op {op}").into()),
+                }
+            }
+            steps.push(lists(&m));
+        }
+        writeln!(out, "{}", json!({"steps": steps, "committed": m.commit()}))?;
+    }
+    Ok(())
+}

crates/horizon-client/examples/recipe_book_view_fixture.rs

@@ -26,6 +26,11 @@ fn main() -> horizon_client::Result<()> {
     let mut book = Book::build(&recipes, &items);
     book.set_display_ids(&index);
     let max = |s: &horizon_client::items::ItemStack| items.get(&s.item).map_or(64, |i| i.max_stack);
+    let names = horizon_client::creative::Names::load(root);
+    let translate = |k: &str| names.get(k).map(str::to_owned);
+    let tooltip = |s: &horizon_client::items::ItemStack| {
+        horizon_client::item_tooltip::lines(s, items.get(&s.item), &translate)
+    };
     let mut out = String::new();
     for line in cases.lines() {
         let case: Value = serde_json::from_str(line)?;
@@ -69,6 +74,7 @@ fn main() -> horizon_client::Result<()> {
             _ => BookType::Smoker,
         };
         let filtering = case["filtering"].as_bool().unwrap_or(false);
+        let query = case["search"].as_str().unwrap_or_default();
         for tab in book_type.tabs() {
             let collections = client.collections(&book, book_type, tab);
             let selected = |i: usize| match (&book.entries[i].display, book_type) {
@@ -85,6 +91,9 @@ fn main() -> horizon_client::Result<()> {
             let shown: Vec<_> = collections
                 .iter()
                 .filter(|c| c.entries.iter().any(|&i| selected(i)))
+                .filter(|c| {
+                    query.is_empty() || book.collection_matches(&c.entries, query, &tooltip)
+                })
                 .filter(|c| !filtering || c.entries.iter().any(|&i| craftable(i)))
                 .collect();
             let name = match tab {

crates/horizon-client/examples/skin_image_fixture.rs

@@ -0,0 +1,32 @@
+//! Headless transport for the skin half of the player list parity gate:
+//! decodes each base64 PNG and runs `horizon_client::skins::process_legacy_skin`,
+//! writing the RGBA result in base64, or "refused".
+#![forbid(unsafe_code)]
+use std::{
+    fs,
+    io::{BufWriter, Write},
+    path::PathBuf,
+};
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+fn main() -> Result<()> {
+    let args: Vec<PathBuf> = std::env::args_os().skip(1).map(PathBuf::from).collect();
+    let [inputs, output] = args.as_slice() else {
+        return Err("usage: skin_image_fixture INPUTS OUTPUT".into());
+    };
+    let mut out = BufWriter::new(fs::File::create(output)?);
+    for line in fs::read_to_string(inputs)?
+        .lines()
+        .filter(|l| !l.is_empty())
+    {
+        let png = horizon_client::skins::base64_decode(line).ok_or("bad base64")?;
+        let result = horizon_client::hud::decode_bytes(&png)
+            .ok()
+            .and_then(|(w, h, rgba)| horizon_client::skins::process_legacy_skin(w, h, &rgba));
+        match result {
+            Some(rgba) => writeln!(out, "{}", horizon_client::lan::base64(&rgba))?,
+            None => writeln!(out, "refused")?,
+        }
+    }
+    Ok(())
+}

crates/horizon-client/examples/tab_list_fixture.rs

@@ -2,7 +2,8 @@
 //! scoreboard (teams, `list` objective, scores), listed players, header and
 //! footer, replays its frames through `horizon_client::tab_list` and writes
 //! the draw calls in vanilla's GuiGraphicsExtractor terms (text as styled
-//! runs, faces as skin blits).
+//! runs, faces as skin blits), each face's skin chosen by
+//! `horizon_client::skins` from the profile's `textures` property.
 #![forbid(unsafe_code)]
 use horizon_client::{
     component,
@@ -10,6 +11,7 @@ use horizon_client::{
     hud_layout::GuiDraw,
     lang,
     scoreboard::{NumberFormat, RenderType, Scoreboard},
+    skins,
     tab_list::{self, TabInputs, TabList, TabPlayer},
     text::Text,
 };
@@ -92,6 +94,12 @@ fn main() -> Result<()> {
                 format(&c["objective"]["numberFormat"]),
             );
         }
+        let uris: Vec<&str> = c["validUris"]
+            .as_array()
+            .into_iter()
+            .flatten()
+            .filter_map(Value::as_str)
+            .collect();
         let mut players = Vec::new();
         let mut upside = Vec::new();
         for p in c["players"].as_array().into_iter().flatten() {
@@ -108,6 +116,26 @@ fn main() -> Result<()> {
             player.display_name = (!p["displayName"].is_null()).then(|| p["displayName"].clone());
             player.list_order = p["listOrder"].as_i64().unwrap_or(0) as i32;
             player.show_hat = p["showHat"].as_bool().unwrap_or(true);
+            if let Some(t) = p.get("textures").filter(|t| !t.is_null()) {
+                let signature = match t["signature"].as_str() {
+                    None => skins::Signature::Unsigned,
+                    Some("valid") => skins::Signature::Signed,
+                    Some(_) => skins::Signature::Invalid,
+                };
+                let textures = skins::unpack(t["value"].as_str().unwrap_or(""), signature, &uris);
+                let local = c["local"].as_str() == p["uuid"].as_str();
+                let download = |_, url: &str| {
+                    let hash = skins::texture_hash(url).unwrap_or_default();
+                    match c["downloads"][&hash].as_str() {
+                        Some("pending") => skins::Download::Pending,
+                        Some("fail") => skins::Download::Failed,
+                        _ => skins::Download::Ready,
+                    }
+                };
+                if let Some(skin) = skins::lookup(&textures, !local, download) {
+                    player.skin = skin;
+                }
+            }
             players.push(player);
         }
         let mut list = TabList::default();

crates/horizon-client/src/chat.rs

@@ -3,11 +3,13 @@
 //! (ChatScreen + EditBox + CommandSuggestions: history navigation, argument
 //! colouring, usage hints, parse errors and tab completion).
 use crate::{
-    command::{Dispatcher, ParseResults, Registries, Suggestion},
-    hud::{HudAtlas, HudBatch, rgba},
+    command::{
+        Dispatcher, ParseResults, Registries, Suggestion, SuggestionsBuilder, merge_suggestions,
+    },
+    hud::{HudAtlas, HudBatch},
     hud_layout::{self, GuiDraw, PoseOp},
+    screen_draw::{self as d, Draw, Measure, TextField},
     text::{self, Style, Text},
-    ui::{EditBox, char_len},
 };
 
 /// GuiMessageTag.systemSinglePlayer's indicator colour.
@@ -299,81 +301,151 @@ impl Chat {
     }
 }
 
-/// CommandSuggestions.SuggestionsList.
+/// `CommandSuggestions.SuggestionsList`.
 #[derive(Clone, Debug)]
 struct SuggestionList {
-    x: f32,
-    width: f32,
+    /// `rect`: x, y, width, height.
+    rect: [i32; 4],
+    original: String,
     list: Vec<Suggestion>,
     offset: usize,
     current: usize,
-    original: String,
+    last_mouse: (i32, i32),
     tab_cycles: bool,
-    last_mouse: (f32, f32),
+}
+impl SuggestionList {
+    fn contains(&self, x: i32, y: i32) -> bool {
+        let [rx, ry, w, h] = self.rect;
+        x >= rx && x <= rx + w && y >= ry && y <= ry + h
+    }
 }
 
-/// The open chat screen.
-pub struct ChatScreen {
-    pub input: EditBox,
-    history_pos: usize,
-    history_buffer: String,
-    parse: Option<ParseResults>,
-    usage: Vec<Text>,
-    usage_x: f32,
-    suggestions: Option<SuggestionList>,
-    pending: Vec<Suggestion>,
-    pending_start: usize,
-    keep_suggestions: bool,
-    allow_suggestions: bool,
-    pub auto_suggestions: bool,
-    dirty: bool,
+/// What a key did on the chat screen.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub enum ChatAction {
+    None,
+    /// Escape: the screen closes.
+    Close,
+    /// Enter: the message is sent and the screen closes.
+    Submit(String),
 }
-const FILL: u32 = 0xD000_0000;
-fn fill_color() -> u32 {
-    rgba(0, 0, 0, (FILL >> 24) as u8)
+
+/// The dispatcher and registries the suggestions come from.
+pub struct Commands<'a> {
+    pub dispatcher: &'a Dispatcher,
+    pub registries: &'a Registries,
+}
+
+/// The open chat screen: vanilla's `ChatScreen` with its `EditBox` and
+/// `CommandSuggestions` (argument colouring, usage lines, parse errors,
+/// the suggestion list, Tab completion, history).
+pub struct ChatScreen {
+    pub input: TextField,
+    width: i32,
+    height: i32,
+    history_buffer: String,
+    history_pos: usize,
+    parse: Option<ParseResults>,
+    /// The completions at the cursor (`pendingSuggestions`): range start (bytes) and list.
+    pending: Option<(usize, Vec<Suggestion>)>,
+    suggestions: Option<SuggestionList>,
+    usage: Vec<Text>,
+    usage_position: i32,
+    usage_width: i32,
+    allow_suggestions: bool,
+    keep_suggestions: bool,
+    pub auto_suggestions: bool,
+}
+/// `CommandSuggestions`' fill colour.
+const FILL: i32 = -805306368;
+fn byte_at(s: &str, chars: usize) -> usize {
+    s.char_indices().nth(chars).map_or(s.len(), |(i, _)| i)
+}
+fn chars_to(s: &str, byte: usize) -> usize {
+    s[..byte.min(s.len())].chars().count()
+}
+/// `Mth.clamp(int)`: the minimum wins over a smaller maximum.
+fn clamp(v: i32, lo: i32, hi: i32) -> i32 {
+    if v < lo { lo } else { v.min(hi) }
+}
+/// `CommandSuggestions.getLastWordIndex`: after the last whitespace run.
+fn last_word_index(s: &str) -> usize {
+    let mut out = 0;
+    let mut prev_space = false;
+    for (i, c) in s.char_indices() {
+        let space = matches!(c, ' ' | '\t' | '\n' | '\u{b}' | '\u{c}' | '\r');
+        if prev_space && !space {
+            out = i;
+        }
+        prev_space = space;
+    }
+    if prev_space { s.len() } else { out }
 }
 impl ChatScreen {
-    pub fn new(initial: &str, history_len: usize, width: f32, height: f32) -> Self {
-        let mut input = EditBox::new(4.0, height - 12.0, width - 4.0, 12.0);
-        input.bordered = false;
+    /// `ChatScreen.init`: the input at the bottom, focused, holding `initial`.
+    pub fn new(
+        m: &Measure,
+        c: &Commands,
+        initial: &str,
+        history_len: usize,
+        width: i32,
+        height: i32,
+    ) -> Self {
+        let mut input = TextField::new(4, height - 12, width - 4, 12);
         input.max_length = 256;
-        input.set_value(initial);
-        Self {
+        input.bordered = false;
+        input.focused = true;
+        input.set_value(m, initial);
+        let mut s = Self {
             input,
-            history_pos: history_len,
+            width,
+            height,
             history_buffer: String::new(),
+            history_pos: history_len,
             parse: None,
-            usage: Vec::new(),
-            usage_x: 0.0,
+            pending: None,
             suggestions: None,
-            pending: Vec::new(),
-            pending_start: 0,
-            keep_suggestions: false,
+            usage: Vec::new(),
+            usage_position: 0,
+            usage_width: 0,
             allow_suggestions: false,
+            keep_suggestions: false,
             auto_suggestions: true,
-            dirty: true,
-        }
-    }
-    /// Keep the input box at the bottom when the window resizes.
-    pub fn resize(&mut self, width: f32, height: f32) {
-        self.input.x = 4.0;
-        self.input.y = height - 12.0;
-        self.input.width = width - 4.0;
+        };
+        s.update_command_info(m, c);
+        s
     }
     pub fn value(&self) -> &str {
         &self.input.value
     }
-    /// ChatScreen.onEdited.
-    pub fn edited(&mut self) {
-        self.allow_suggestions = true;
-        self.dirty = true;
-    }
-    /// CommandSuggestions.updateCommandInfo (run lazily before drawing/keys).
-    pub fn update(&mut self, atlas: &HudAtlas, d: &Dispatcher, reg: &Registries) {
-        if !self.dirty {
-            return;
+    /// `ChatScreen.resize`: a new screen with the current text.
+    pub fn resize(&mut self, m: &Measure, c: &Commands, width: i32, height: i32) {
+        if (width, height) != (self.width, self.height) {
+            let value = self.input.value.clone();
+            let auto = self.auto_suggestions;
+            *self = Self::new(m, c, &value, self.history_pos, width, height);
+            self.auto_suggestions = auto;
         }
-        self.dirty = false;
+    }
+    /// `ChatScreen.onEdited`.
+    fn edited(&mut self, m: &Measure, c: &Commands) {
+        self.allow_suggestions = true;
+        self.update_command_info(m, c);
+    }
+    /// Typed text (`charTyped` per character).
+    pub fn type_text(&mut self, m: &Measure, c: &Commands, text: &str) {
+        for ch in text.chars() {
+            if ch >= ' '
+                && ch != '\u{7f}'
+                && ch != '§'
+                && self.input.insert_text(m, &ch.to_string())
+            {
+                self.edited(m, c);
+            }
+        }
+    }
+    /// `CommandSuggestions.updateCommandInfo`.
+    fn update_command_info(&mut self, m: &Measure, c: &Commands) {
         let command = self.input.value.clone();
         if self.parse.as_ref().is_some_and(|p| p.input != command) {
             self.parse = None;
@@ -383,221 +455,234 @@ impl ChatScreen {
             self.suggestions = None;
         }
         self.usage.clear();
-        self.pending.clear();
-        let cursor_chars = self.input.cursor;
-        let cursor = command
-            .char_indices()
-            .nth(cursor_chars)
-            .map_or(command.len(), |(i, _)| i);
-        if !command.starts_with('/') {
-            return;
-        }
-        if self.parse.is_none() {
-            self.parse = Some(d.parse_at(&command, 1, reg));
-        }
-        let Some(parse) = &self.parse else { return };
-        if cursor >= 1 && (self.suggestions.is_none() || !self.keep_suggestions) {
-            let (range, list) = d.suggestions(parse, cursor, reg);
-            self.pending = list;
-            self.pending_start = range.0;
-            // CommandSuggestions.updateUsageInfo.
-            let mut trailing = false;
-            if cursor == command.len() {
-                if self.pending.is_empty() && !parse.errors.is_empty() {
-                    let mut literals = 0;
-                    for (_, e) in &parse.errors {
-                        if e.literal_incorrect {
-                            literals += 1;
-                        } else {
-                            self.usage.push(e.with_context().with_color(text::RED));
-                        }
-                    }
-                    if literals > 0 {
-                        let reader = crate::command::Reader {
-                            string: &parse.input,
-                            cursor: parse.cursor,
-                        };
-                        self.usage.push(
-                            crate::command::CommandError::tr_at(
-                                "command.unknown.argument",
-                                &[],
-                                &reader,
-                            )
-                            .with_context()
-                            .with_color(text::RED),
-                        );
-                    }
-                } else if parse.can_read() {
-                    trailing = true;
-                }
+        let cursor = self.input.cursor;
+        let cursor_b = byte_at(&command, cursor);
+        if command.starts_with('/') {
+            if self.parse.is_none() {
+                self.parse = Some(c.dispatcher.parse_at(&command, 1, c.registries));
             }
-            let (node, start, _) = parse.context.suggestion_context(cursor);
-            if self.usage.is_empty() {
-                let mut lines: Vec<Text> = d
-                    .smart_usage(node, reg.permission)
-                    .into_iter()
-                    .filter(|(n, _)| {
-                        !matches!(d.nodes[*n].kind, crate::command::NodeKind::Literal(_))
-                    })
-                    .map(|(_, u)| Text::colored(u, text::GRAY))
-                    .collect();
-                if lines.is_empty()
-                    && trailing
-                    && let Some(e) = parse.error()
-                {
-                    lines.push(e.with_context().with_color(text::RED));
-                }
-                self.usage = lines;
-            }
-            let usage_width = self
-                .usage
-                .iter()
-                .map(|u| atlas.font.width_text(u))
-                .fold(0.0, f32::max);
-            let start_chars = char_len(&command[..start.min(command.len())]);
-            self.usage_x = if self.usage.is_empty() {
-                0.0
-            } else {
-                self.input.screen_x(atlas, start_chars).clamp(
-                    0.0,
-                    (self.input.screen_x(atlas, 0) + self.input.inner_width() - usage_width)
-                        .max(0.0),
-                )
-            };
-            self.suggestions = None;
-            if self.allow_suggestions && self.auto_suggestions {
-                self.show_suggestions(atlas);
+            if cursor >= 1 && (self.suggestions.is_none() || !self.keep_suggestions) {
+                let parse = self.parse.as_ref().expect("parsed above");
+                let (range, list) = c.dispatcher.suggestions(parse, cursor_b, c.registries);
+                self.pending = Some((range.0, list));
+                self.update_usage_info(m, c);
             }
+        } else if !command.chars().all(char::is_whitespace) {
+            let partial = &command[..cursor_b];
+            let mut builder = SuggestionsBuilder::new(partial, last_word_index(partial));
+            builder.suggest_matching(c.registries.players.iter().map(String::as_str));
+            let (range, list) = merge_suggestions(partial, builder.out);
+            self.pending = Some((range.0, list));
+            self.usage_width = 0;
+            self.usage_position = 0;
+        } else {
+            self.pending = None;
         }
     }
-    /// CommandSuggestions.showSuggestions.
-    fn show_suggestions(&mut self, atlas: &HudAtlas) {
-        if self.pending.is_empty() {
+    /// `CommandSuggestions.updateUsageInfo`.
+    fn update_usage_info(&mut self, m: &Measure, c: &Commands) {
+        let Some(parse) = &self.parse else { return };
+        let empty = self.pending.as_ref().is_none_or(|p| p.1.is_empty());
+        let mut trailing = false;
+        if self.input.cursor == self.input.value.chars().count() {
+            if empty && !parse.errors.is_empty() {
+                let mut literals = 0;
+                for (_, e) in &parse.errors {
+                    if e.literal_incorrect {
+                        literals += 1;
+                    } else {
+                        self.usage.push(e.with_context());
+                    }
+                }
+                if literals > 0 {
+                    let reader = crate::command::Reader {
+                        string: &parse.input,
+                        cursor: parse.cursor,
+                    };
+                    self.usage.push(
+                        crate::command::CommandError::tr_at(
+                            "command.unknown.argument",
+                            &[],
+                            &reader,
+                        )
+                        .with_context(),
+                    );
+                }
+            } else if parse.can_read() {
+                trailing = true;
+            }
+        }
+        let cursor_b = byte_at(&self.input.value, self.input.cursor);
+        let (node, start, _) = parse.context.suggestion_context(cursor_b);
+        if self.usage.is_empty() {
+            let entries: Vec<Text> = c
+                .dispatcher
+                .smart_usage(node, c.registries.permission)
+                .into_iter()
+                .filter(|(n, _)| {
+                    !matches!(
+                        c.dispatcher.nodes[*n].kind,
+                        crate::command::NodeKind::Literal(_)
+                    )
+                })
+                .map(|(_, u)| Text::colored(u, text::GRAY))
+                .collect();
+            if entries.is_empty()
+                && trailing
+                && let Some(e) = parse.error()
+            {
+                self.usage.push(e.with_context());
+            }
+            self.usage.extend(entries);
+        }
+        self.usage_width = self.usage.iter().map(|u| m.width(u)).max().unwrap_or(0);
+        self.usage_position = if self.usage.is_empty() {
+            0
+        } else {
+            let start = chars_to(&self.input.value, start);
+            clamp(
+                self.input.screen_x(m, start),
+                0,
+                self.input.screen_x(m, 0) + self.input.inner_width() - self.usage_width,
+            )
+        };
+        self.suggestions = None;
+        if self.allow_suggestions && self.auto_suggestions {
+            self.show_suggestions(m);
+        }
+    }
+    /// `CommandSuggestions.showSuggestions`.
+    fn show_suggestions(&mut self, m: &Measure) {
+        let Some((start, list)) = self.pending.clone() else {
+            return;
+        };
+        if list.is_empty() {
             return;
         }
+        let width = list.iter().map(|s| m.width_str(&s.text)).max().unwrap_or(0);
         let value = self.input.value.clone();
-        let width = self
-            .pending
-            .iter()
-            .map(|s| atlas.font.width(&s.text))
-            .fold(0.0, f32::max);
-        let start_chars = char_len(&value[..self.pending_start.min(value.len())]);
-        let x = self.input.screen_x(atlas, start_chars).clamp(
-            0.0,
-            (self.input.screen_x(atlas, 0) + self.input.inner_width() - width).max(0.0),
+        let x = clamp(
+            self.input.screen_x(m, chars_to(&value, start)),
+            0,
+            self.input.screen_x(m, 0) + self.input.inner_width() - width,
         );
-        // Sort: suggestions starting with the last word first.
-        let cursor = value
-            .char_indices()
-            .nth(self.input.cursor)
-            .map_or(value.len(), |(i, _)| i);
-        let partial = &value[..cursor];
-        let last_word = partial.rfind(char::is_whitespace).map_or(0, |i| i + 1);
-        let word = partial[last_word..].to_lowercase();
-        let (mut first, partial_matches): (Vec<Suggestion>, Vec<Suggestion>) =
-            self.pending.iter().cloned().partition(|s| {
+        let y = self.height - 12;
+        // sortSuggestions: those starting with the word at the cursor first.
+        let partial = &value[..byte_at(&value, self.input.cursor)];
+        let word = partial[last_word_index(partial)..].to_lowercase();
+        let (mut first, rest): (Vec<Suggestion>, Vec<Suggestion>) =
+            list.into_iter().partition(|s| {
                 s.text.starts_with(&word) || s.text.starts_with(&format!("minecraft:{word}"))
             });
-        first.extend(partial_matches);
-        let mut list = SuggestionList {
-            x: x - 1.0,
-            width: width + 1.0,
+        first.extend(rest);
+        let n = first.len().min(10) as i32;
+        let mut l = SuggestionList {
+            rect: [x - 1, y - 3 - n * 12, width + 1, n * 12],
+            original: value,
             list: first,
             offset: 0,
             current: 0,
-            original: value,
+            last_mouse: (0, 0),
             tab_cycles: false,
-            last_mouse: (-1.0, -1.0),
         };
-        self.select(&mut list, 0);
-        self.suggestions = Some(list);
+        self.select(&mut l, 0);
+        self.suggestions = Some(l);
     }
-    fn select(&mut self, list: &mut SuggestionList, index: isize) {
-        let n = list.list.len() as isize;
-        list.current = index.rem_euclid(n.max(1)) as usize;
-        let applied = list.list[list.current].apply(&list.original);
+    /// `SuggestionsList.select`: the grey completion after the text.
+    fn select(&mut self, l: &mut SuggestionList, index: isize) {
+        let n = l.list.len() as isize;
+        let mut i = index;
+        if i < 0 {
+            i += n;
+        }
+        if i >= n {
+            i -= n;
+        }
+        l.current = i as usize;
+        let applied = l.list[l.current].apply(&l.original);
         self.input.suggestion = applied
             .strip_prefix(self.input.value.as_str())
-            .filter(|s| !s.is_empty())
             .map(str::to_owned);
     }
-    fn cycle(&mut self, list: &mut SuggestionList, dir: isize) {
-        self.select(list, list.current as isize + dir);
-        let limit = 10;
-        let max_offset = list.list.len().saturating_sub(limit);
-        if list.current < list.offset {
-            list.offset = list.current.min(max_offset);
-        } else if list.current > list.offset + limit - 1 {
-            list.offset = (list.current + 1).saturating_sub(limit).min(max_offset);
+    fn cycle(&mut self, l: &mut SuggestionList, dir: isize) {
+        self.select(l, l.current as isize + dir);
+        let max = l.list.len().saturating_sub(10);
+        if l.current < l.offset {
+            l.offset = l.current.min(max);
+        } else if l.current > l.offset + 9 {
+            l.offset = (l.current as isize + 1 - 10).clamp(0, max as isize) as usize;
         }
     }
-    fn use_suggestion(&mut self, list: &mut SuggestionList) {
-        let s = list.list[list.current].clone();
+    /// `SuggestionsList.useSuggestion`.
+    fn use_suggestion(&mut self, m: &Measure, c: &Commands, l: &mut SuggestionList) {
+        let s = l.list[l.current].clone();
         self.keep_suggestions = true;
-        let applied = s.apply(&list.original);
-        self.input.set_value(&applied);
-        let end =
-            char_len(&list.original[..s.range.0.min(list.original.len())]) + char_len(&s.text);
-        self.input.set_cursor(end, false);
-        self.dirty = true;
-        self.select(list, list.current as isize);
+        let value = s.apply(&l.original);
+        self.suggestions = Some(l.clone());
+        self.input.set_value(m, &value);
+        self.edited(m, c);
+        let end = chars_to(&l.original, s.range.0) + s.text.chars().count();
+        self.input.set_cursor_and_highlight(m, end);
+        self.select(l, l.current as isize);
         self.keep_suggestions = false;
-        list.tab_cycles = true;
+        l.tab_cycles = true;
     }
-    /// Suggestion-list keys (CommandSuggestions.keyPressed). Returns true if handled.
-    pub fn suggestion_key(
+    /// `ChatScreen.keyPressed`.
+    pub fn key(
         &mut self,
-        atlas: &HudAtlas,
-        d: &Dispatcher,
-        reg: &Registries,
+        m: &Measure,
+        c: &Commands,
+        history: &[String],
         key: winit::keyboard::KeyCode,
         shift: bool,
-    ) -> bool {
+        ctrl: bool,
+    ) -> ChatAction {
         use winit::keyboard::KeyCode as K;
-        self.update(atlas, d, reg);
-        if let Some(mut list) = self.suggestions.take() {
+        // CommandSuggestions.keyPressed.
+        if let Some(mut l) = self.suggestions.take() {
             let handled = match key {
-                K::ArrowUp => {
-                    self.cycle(&mut list, -1);
-                    list.tab_cycles = false;
-                    true
-                }
-                K::ArrowDown => {
-                    self.cycle(&mut list, 1);
-                    list.tab_cycles = false;
+                K::ArrowUp | K::ArrowDown => {
+                    self.cycle(&mut l, if key == K::ArrowUp { -1 } else { 1 });
+                    l.tab_cycles = false;
                     true
                 }
                 K::Tab => {
-                    if list.tab_cycles {
-                        self.cycle(&mut list, if shift { -1 } else { 1 });
+                    if l.tab_cycles {
+                        self.cycle(&mut l, if shift { -1 } else { 1 });
                     }
-                    self.use_suggestion(&mut list);
-                    // Keep the list across the re-parse triggered by the edit.
-                    let keep = list.clone();
-                    self.keep_suggestions = true;
-                    self.update(atlas, d, reg);
-                    self.keep_suggestions = false;
-                    self.suggestions = Some(keep);
-                    return true;
+                    self.use_suggestion(m, c, &mut l);
+                    true
                 }
                 K::Escape => {
                     self.input.suggestion = None;
-                    return true;
+                    return ChatAction::None;
                 }
                 _ => false,
             };
-            self.suggestions = Some(list);
-            return handled;
+            self.suggestions = Some(l);
+            if handled {
+                return ChatAction::None;
+            }
+        } else if key == K::Tab {
+            self.show_suggestions(m);
+            return ChatAction::None;
         }
-        if key == K::Tab {
-            self.show_suggestions(atlas);
-            return true;
+        match key {
+            K::Escape => return ChatAction::Close,
+            K::Enter | K::NumpadEnter => return ChatAction::Submit(self.normalized()),
+            K::ArrowUp => self.move_in_history(m, c, history, -1),
+            K::ArrowDown => self.move_in_history(m, c, history, 1),
+            _ => {
+                if self.input.key(m, key, shift, ctrl) == Some(true) {
+                    self.edited(m, c);
+                }
+            }
         }
-        false
+        ChatAction::None
     }
-    /// ChatScreen.moveInHistory.
-    pub fn move_in_history(&mut self, recent: &[String], dir: isize) {
-        let max = recent.len();
+    /// `ChatScreen.moveInHistory`.
+    fn move_in_history(&mut self, m: &Measure, c: &Commands, history: &[String], dir: isize) {
+        let max = history.len();
         let new = (self.history_pos as isize + dir).clamp(0, max as isize) as usize;
         if new == self.history_pos {
             return;
@@ -605,55 +690,70 @@ impl ChatScreen {
         if new == max {
             self.history_pos = max;
             let b = self.history_buffer.clone();
-            self.input.set_value(&b);
+            self.input.set_value(m, &b);
+            self.edited(m, c);
         } else {
             if self.history_pos == max {
                 self.history_buffer = self.input.value.clone();
             }
-            self.input.set_value(&recent[new]);
-            self.suggestions = None;
+            self.input.set_value(m, &history[new]);
+            self.edited(m, c);
             self.allow_suggestions = false;
+            self.suggestions = None;
             self.history_pos = new;
         }
-        self.dirty = true;
     }
-    /// Mouse wheel over the suggestion list.
-    pub fn scroll_suggestions(&mut self, cursor: (f32, f32), height: f32, amount: f32) -> bool {
-        let Some(list) = &mut self.suggestions else {
-            return false;
-        };
-        let n = list.list.len().min(10);
-        let top = height - 12.0 - 3.0 - n as f32 * 12.0;
-        if crate::ui::hovered(cursor, list.x, top, list.width, n as f32 * 12.0) {
-            let max = list.list.len().saturating_sub(10) as isize;
-            list.offset = (list.offset as isize - amount.signum() as isize).clamp(0, max) as usize;
-            return true;
-        }
-        false
-    }
-    /// Click on a suggestion row.
-    pub fn click(&mut self, cursor: (f32, f32), height: f32) -> bool {
-        let Some(mut list) = self.suggestions.take() else {
-            return false;
-        };
-        let n = list.list.len().min(10);
-        let top = height - 12.0 - 3.0 - n as f32 * 12.0;
-        if crate::ui::hovered(cursor, list.x, top, list.width, n as f32 * 12.0) {
-            let row = ((cursor.1 - top) / 12.0) as usize + list.offset;
-            if row < list.list.len() {
-                self.select(&mut list, row as isize);
-                self.use_suggestion(&mut list);
+    /// A left click (`ChatScreen.mouseClicked`): a suggestion, else the input.
+    pub fn click(&mut self, m: &Measure, c: &Commands, x: f64, y: f64) -> bool {
+        if let Some(mut l) = self.suggestions.take() {
+            let (xi, yi) = (x as i32, y as i32);
+            if l.contains(xi, yi) {
+                let line = (yi - l.rect[1]) / 12 + l.offset as i32;
+                if line >= 0 && (line as usize) < l.list.len() {
+                    self.select(&mut l, line as isize);
+                    self.use_suggestion(m, c, &mut l);
+                }
+                self.suggestions = Some(l);
+                return true;
             }
-            self.suggestions = Some(list);
+            self.suggestions = Some(l);
+        }
+        if self.input.contains(x, y) {
+            self.input.click(m, x, false);
             return true;
         }
-        self.suggestions = Some(list);
         false
     }
-    /// CommandSuggestions.formatText: argument colours over the input.
-    fn formatted(&self) -> Option<Text> {
-        let parse = self.parse.as_ref()?;
-        let value = &self.input.value;
+    /// The mouse wheel over the suggestion list (`SuggestionsList.mouseScrolled`).
+    pub fn scroll(&mut self, mouse: (i32, i32), amount: f64) -> bool {
+        let Some(l) = &mut self.suggestions else {
+            return false;
+        };
+        if !l.contains(mouse.0, mouse.1) {
+            return false;
+        }
+        let max = l.list.len().saturating_sub(10) as i32;
+        l.offset = ((l.offset as f64 - amount.clamp(-1.0, 1.0)) as i32).clamp(0, max) as usize;
+        true
+    }
+    /// `CommandSuggestions.formatText`: argument colours over the input.
+    fn format(&self, value: &str, offset: usize) -> Text {
+        let gray = Style::color(text::GRAY);
+        let Some(parse) = &self.parse else {
+            return Text::literal(value);
+        };
+        let full = &self.input.value;
+        let chars = |b: usize| chars_to(full, b) as isize;
+        let len = value.chars().count() as isize;
+        let piece = |from: isize, to: isize| -> String {
+            value
+                .chars()
+                .skip(from as usize)
+                .take((to - from).max(0) as usize)
+                .collect()
+        };
+        let mut out = Text::empty();
+        let mut unformatted = 0isize;
         let styles = [
             text::AQUA,
             text::YELLOW,
@@ -661,128 +761,134 @@ impl ChatScreen {
             text::LIGHT_PURPLE,
             text::GOLD,
         ];
-        let mut colors = vec![text::GRAY; value.len()];
-        let ctx = parse.context.last_child();
-        for (i, arg) in ctx.args.iter().enumerate() {
-            let c = styles[i % styles.len()];
-            for b in arg.range.0.min(value.len())..arg.range.1.min(value.len()) {
-                colors[b] = c;
+        for (i, arg) in parse.context.last_child().args.iter().enumerate() {
+            let start = (chars(arg.range.0) - offset as isize).max(0);
+            if start >= len {
+                break;
+            }
+            let end = (chars(arg.range.1) - offset as isize).min(len);
+            if end > 0 {
+                out.push(Text::styled(piece(unformatted, start), gray.clone()));
+                out.push(Text::styled(
+                    piece(start, end),
+                    Style::color(styles[i % styles.len()]),
+                ));
+                unformatted = end;
             }
         }
         if parse.can_read() {
-            for c in colors.iter_mut().skip(parse.cursor) {
-                *c = text::RED;
+            let start = (chars(parse.cursor) - offset as isize).max(0);
+            if start < len {
+                let remaining = (full.len() - parse.cursor.min(full.len())) as isize;
+                let end = (start + full[parse.cursor.min(full.len())..].chars().count() as isize)
+                    .min(len);
+                let _ = remaining;
+                out.push(Text::styled(piece(unformatted, start), gray.clone()));
+                out.push(Text::styled(piece(start, end), Style::color(text::RED)));
+                unformatted = end;
             }
         }
-        let mut out = Text::empty();
-        for (i, ch) in value.char_indices() {
-            out.push(Text::styled(ch.to_string(), Style::color(colors[i])));
-        }
-        Some(out)
+        out.push(Text::styled(piece(unformatted, len), gray));
+        out
     }
-    /// ChatScreen.extractRenderState minus the chat lines.
+    /// `ChatScreen.extractRenderState` without the chat lines: the input's
+    /// background (`background`, `Options.getBackgroundColor`), the input,
+    /// then the suggestion list or the usage lines.
     pub fn draw(
         &mut self,
-        batch: &mut HudBatch,
-        atlas: &HudAtlas,
-        d: &Dispatcher,
-        reg: &Registries,
-        cursor: (f32, f32),
-        background_opacity: f32,
-    ) {
-        self.update(atlas, d, reg);
-        let (w, h) = (batch.width, batch.height);
-        batch.fill(
-            atlas,
-            2.0,
-            h - 14.0,
-            w - 4.0,
-            12.0,
-            rgba(0, 0, 0, (background_opacity * 255.0) as u8),
-        );
-        let formatted = self.formatted();
-        self.input.draw(batch, atlas, formatted.as_ref());
-        let fill = fill_color();
-        if let Some(mut list) = self.suggestions.take() {
-            let limit = list.list.len().min(10);
-            let top = h - 12.0 - 3.0 - limit as f32 * 12.0;
-            let has_prev = list.offset > 0;
-            let has_next = list.list.len() > list.offset + limit;
-            let moved = list.last_mouse != cursor;
-            list.last_mouse = cursor;
-            if has_prev || has_next {
-                batch.fill(atlas, list.x, top - 1.0, list.width, 1.0, fill);
-                batch.fill(
-                    atlas,
-                    list.x,
-                    top + limit as f32 * 12.0,
-                    list.width,
-                    1.0,
-                    fill,
-                );
-                for x in (0..list.width as i32).step_by(2) {
-                    if has_prev {
-                        batch.fill(atlas, list.x + x as f32, top - 1.0, 1.0, 1.0, u32::MAX);
-                    }
-                    if has_next {
-                        batch.fill(
-                            atlas,
-                            list.x + x as f32,
-                            top + limit as f32 * 12.0,
-                            1.0,
-                            1.0,
-                            u32::MAX,
-                        );
-                    }
-                }
-            }
-            let mut hovered_row = None;
-            for i in 0..limit {
-                let y = top + 12.0 * i as f32;
-                batch.fill(atlas, list.x, y, list.width, 12.0, fill);
-                if cursor.0 > list.x
-                    && cursor.0 < list.x + list.width
-                    && cursor.1 > y
-                    && cursor.1 < y + 12.0
-                {
-                    hovered_row = Some(i + list.offset);
-                }
-            }
-            if moved && let Some(r) = hovered_row {
-                self.select(&mut list, r as isize);
-            }
-            for i in 0..limit {
-                let s = &list.list[i + list.offset];
-                let color = if i + list.offset == list.current {
-                    rgba(255, 255, 0, 255)
-                } else {
-                    rgba(0xAA, 0xAA, 0xAA, 255)
-                };
-                batch.text(
-                    atlas,
-                    &s.text,
-                    list.x + 1.0,
-                    top + 2.0 + 12.0 * i as f32,
-                    color,
-                    true,
-                );
-            }
-            if hovered_row.is_some()
-                && let Some(tip) = &list.list[list.current].tooltip
-            {
-                crate::ui::tooltip(batch, atlas, &[Text::literal(tip.clone())], cursor);
-            }
-            self.suggestions = Some(list);
+        m: &Measure,
+        mouse: (i32, i32),
+        blink_ms: u64,
+        background: i32,
+    ) -> Vec<Draw> {
+        let (w, h) = (self.width, self.height);
+        let mut out = Vec::new();
+        d::fill(&mut out, 2, h - 14, w - 2, h - 2, background);
+        let format = |s: &str, o: usize| self.format(s, o);
+        self.input.draw(&mut out, m, blink_ms, Some(&format));
+        if let Some(mut l) = self.suggestions.take() {
+            self.draw_list(&mut out, m, &mut l, mouse);
+            self.suggestions = Some(l);
         } else {
             for (i, line) in self.usage.iter().enumerate() {
-                let y = h - 27.0 - 12.0 * i as f32;
-                let width = atlas.font.width_text(line);
-                batch.fill(atlas, self.usage_x - 1.0, y, width + 2.0, 12.0, fill);
-                batch.text_styled(atlas, line, self.usage_x, y + 2.0, u32::MAX, true);
+                let y = h - 27 - 12 * i as i32;
+                d::fill(
+                    &mut out,
+                    self.usage_position - 1,
+                    y,
+                    self.usage_position + self.usage_width + 1,
+                    y + 12,
+                    FILL,
+                );
+                d::text(&mut out, line.clone(), self.usage_position, y + 2, -1, true);
             }
         }
+        out
     }
-    /// ChatScreen.normalizeChatMessage.
+    fn draw_list(
+        &mut self,
+        out: &mut Vec<Draw>,
+        m: &Measure,
+        l: &mut SuggestionList,
+        mouse: (i32, i32),
+    ) {
+        let limit = l.list.len().min(10);
+        let [rx, ry, rw, rh] = l.rect;
+        let has_prev = l.offset > 0;
+        let has_next = l.list.len() > l.offset + limit;
+        let moved = l.last_mouse != mouse;
+        if moved {
+            l.last_mouse = mouse;
+        }
+        if has_prev || has_next {
+            d::fill(out, rx, ry - 1, rx + rw, ry, FILL);
+            d::fill(out, rx, ry + rh, rx + rw, ry + rh + 1, FILL);
+            if has_prev {
+                for x in (0..rw).step_by(2) {
+                    d::fill(out, rx + x, ry - 1, rx + x + 1, ry, -1);
+                }
+            }
+            if has_next {
+                for x in (0..rw).step_by(2) {
+                    d::fill(out, rx + x, ry + rh, rx + x + 1, ry + rh + 1, -1);
+                }
+            }
+        }
+        let mut hovered = false;
+        for i in 0..limit {
+            let y = ry + 12 * i as i32;
+            d::fill(out, rx, y, rx + rw, y + 12, FILL);
+            if mouse.0 > rx && mouse.0 < rx + rw && mouse.1 > y && mouse.1 < y + 12 {
+                if moved {
+                    self.select(l, (i + l.offset) as isize);
+                }
+                hovered = true;
+            }
+            let s = &l.list[i + l.offset];
+            let color = if i + l.offset == l.current {
+                -256
+            } else {
+                -5592406
+            };
+            d::text(
+                out,
+                Text::literal(s.text.clone()),
+                rx + 1,
+                ry + 2 + 12 * i as i32,
+                color,
+                true,
+            );
+        }
+        if hovered && let Some(tip) = &l.list[l.current].tooltip {
+            out.push(Draw::Tooltip {
+                lines: vec![Text::literal(tip.clone())],
+                x: mouse.0,
+                y: mouse.1,
+            });
+        }
+        let _ = m;
+    }
+    /// `ChatScreen.normalizeChatMessage`.
     pub fn normalized(&self) -> String {
         let collapsed = self
             .input

crates/horizon-client/src/crafting.rs

@@ -297,9 +297,19 @@ pub enum Special {
 }
 impl Special {
     /// The recipe-book displays of a learnable (non-custom) crafting recipe:
-    /// its layout and result.
-    pub fn book_displays(&self) -> Vec<(crate::recipe_book::Display, ItemStack)> {
+    /// its layout, its result as the button shows it, and every stack the
+    /// result display cycles through when it is more than that one
+    /// (`SlotDisplay.resolveForStacks`).
+    pub fn book_displays(&self) -> Vec<BookDisplay> {
         use crate::recipe_book::Display;
+        let first_of =
+            |all: &Vec<ItemStack>, single: ItemStack| all.first().cloned().unwrap_or(single);
+        let shown = |display, result, variants| BookDisplay {
+            display,
+            result,
+            variants,
+            stacks: Vec::new(),
+        };
         match self {
             Self::Transmute {
                 input,
@@ -313,26 +323,54 @@ impl Special {
                     let mut ingredients = vec![input.clone()];
                     ingredients.extend(std::iter::repeat_n(material.clone(), n));
                     let mut made = result.create();
-                    if result.item.is_none() {
-                        // The result keeps the input's item: show the first one.
-                        if let Some(first) = input.0.iter().min() {
-                            made.item = Arc::from(first.as_str());
-                        }
-                    }
                     if *add_count {
                         made.count += n as u32;
                     }
-                    (Display::Shapeless(ingredients), made)
+                    // The result keeps the input's item: any item of the ingredient.
+                    let all: Vec<ItemStack> = if result.item.is_none() {
+                        input
+                            .1
+                            .iter()
+                            .map(|item| {
+                                let mut stack = made.clone();
+                                stack.item = Arc::from(item.as_str());
+                                stack
+                            })
+                            .collect()
+                    } else {
+                        Vec::new()
+                    };
+                    shown(Display::Shapeless(ingredients), first_of(&all, made), all)
                 })
                 .collect(),
             Self::Dye {
                 target,
                 dye,
                 result,
-            } => vec![(
-                Display::Shapeless(vec![target.clone(), dye.clone()]),
-                result.create(),
-            )],
+            } => {
+                // DyedSlotDemo: the targets cycle fastest, 16 stacks at most.
+                let (targets, dyes) = (&target.1, &dye.1);
+                let all: Vec<ItemStack> = (0..targets.len() * dyes.len())
+                    .map(|i| {
+                        let mut made = result.create();
+                        made.item = Arc::from(targets[i % targets.len()].as_str());
+                        let name = dyes[i / targets.len()].trim_start_matches("minecraft:");
+                        let color = crate::block_entity_render::DYES
+                            .iter()
+                            .find(|(c, _)| name.strip_suffix("_dye") == Some(c))
+                            .map_or(crate::block_entity_render::DYES[0].1, |d| d.1);
+                        made.data_mut().dyed_color = Some(color as i32);
+                        made
+                    })
+                    .take(16)
+                    .collect();
+                let first = result.create();
+                vec![shown(
+                    Display::Shapeless(vec![target.clone(), dye.clone()]),
+                    first_of(&all, first),
+                    all,
+                )]
+            }
             Self::Imbue {
                 source,
                 material,
@@ -341,19 +379,48 @@ impl Special {
                 let cells = (0..9)
                     .map(|i| Some(if i == 4 { source } else { material }.clone()))
                     .collect();
-                vec![(
-                    Display::Shaped {
-                        width: 3,
-                        height: 3,
-                        cells,
-                    },
-                    result.create(),
-                )]
+                // Any potion's tipped arrow.
+                let potions = |item: ItemStack| -> Vec<ItemStack> {
+                    crate::brewing::POTIONS
+                        .iter()
+                        .map(|p| item.clone().with_potion(&format!("minecraft:{}", p.id)))
+                        .collect()
+                };
+                let all = potions(result.create());
+                // The source ingredient is shown as a lingering potion of each kind.
+                let lingering = source
+                    .1
+                    .iter()
+                    .flat_map(|item| potions(ItemStack::new(item, 1)))
+                    .collect();
+                vec![BookDisplay {
+                    stacks: vec![(4, lingering)],
+                    ..shown(
+                        Display::Shaped {
+                            width: 3,
+                            height: 3,
+                            cells,
+                        },
+                        first_of(&all, result.create()),
+                        all,
+                    )
+                }]
             }
             _ => Vec::new(),
         }
     }
 }
+/// One recipe-book display of a special recipe.
+pub struct BookDisplay {
+    pub display: crate::recipe_book::Display,
+    /// The result as the button shows it (the first of `variants`).
+    pub result: ItemStack,
+    /// Every stack the result display cycles through; empty for one stack.
+    pub variants: Vec<ItemStack>,
+    /// Ingredients shown as other stacks than their items, by index in
+    /// `Entry::requirements`.
+    pub stacks: Vec<(usize, Vec<ItemStack>)>,
+}
 /// `CraftingInput`: the occupied bounding box of the grid.
 pub struct Input<'a> {
     pub width: usize,

crates/horizon-client/src/flatgen.rs

@@ -0,0 +1,73 @@
+//! FlatLevelSource: superflat worlds (`minecraft:flat` generator).
+use crate::{chunk::Chunk, streaming::ChunkGenerator};
+use horizon_world::{nbt::Tag, registry::BlockRegistry};
+
+/// The layers of a flat generator, bottom up from the world's minimum Y.
+pub struct FlatTerrain {
+    layers: Vec<u16>,
+    biome: u16,
+}
+impl FlatTerrain {
+    /// The overworld generator of `world_gen_settings` (`data.dimensions`), if it
+    /// is flat. Its `features` and `lakes` decorate the world; a world without
+    /// them (the default) gets only its layers, as FlatLevelSource places them.
+    pub fn from_settings(
+        settings: &Tag,
+        registry: &BlockRegistry,
+        biomes: &crate::biome::Biomes,
+    ) -> Option<Self> {
+        let generator = settings
+            .get("dimensions")?
+            .get("minecraft:overworld")?
+            .get("generator")?;
+        if crate::save::text(generator.get("type"))?.trim_start_matches("minecraft:") != "flat" {
+            return None;
+        }
+        let s = generator.get("settings")?;
+        let biome = crate::save::text(s.get("biome")).unwrap_or_else(|| "minecraft:plains".into());
+        let mut layers = Vec::new();
+        if let Some(Tag::List(list)) = s.get("layers") {
+            for layer in list {
+                let block = crate::save::text(layer.get("block"))?;
+                let height = crate::save::number(layer.get("height")).unwrap_or(0).max(0);
+                let state = registry.default_state(&block)?.0 as u16;
+                layers.extend(std::iter::repeat_n(state, height as usize));
+            }
+        }
+        Some(Self {
+            layers,
+            biome: biomes.id(&biome),
+        })
+    }
+}
+impl ChunkGenerator for FlatTerrain {
+    type Worker = ();
+    fn worker(&self) {}
+    fn proto(&self, _: &mut (), cx: i32, cz: i32) -> crate::streaming::Proto {
+        let mut chunk = Chunk::empty(cx, cz);
+        for s in &mut chunk.sections {
+            std::sync::Arc::make_mut(s).biomes = horizon_core::paletted::PalettedContainer::new(
+                crate::chunk::BIOME_STRATEGY,
+                u32::from(self.biome),
+            );
+        }
+        for (i, &block) in self.layers.iter().enumerate().take(384) {
+            if block == 0 {
+                continue;
+            }
+            for z in 0..16 {
+                for x in 0..16 {
+                    chunk.set(x, -64 + i as i32, z, block);
+                }
+            }
+        }
+        for s in &mut chunk.sections {
+            std::sync::Arc::make_mut(s).compact();
+        }
+        Box::new(chunk)
+    }
+    /// FlatLevelSource.spawnOriginalMobs is empty: no generation-time spawns.
+    fn finish(&self, proto: crate::streaming::Proto) -> Chunk {
+        *proto.downcast::<Chunk>().expect("flat terrain proto")
+    }
+}

crates/horizon-client/src/front.rs

@@ -0,0 +1,987 @@
+//! The front-end screens in Horizon's menu style (`ui_theme`), laid out like
+//! the launcher: a 200-wide sidebar with the sliding selection (Home,
+//! Singleplayer, Multiplayer, Options), content pages with a page header,
+//! settings rows and 1px dividers, and the launcher's opening (the wordmark,
+//! then the interface). They drive the same state as the classic layouts in
+//! `title` and `multiplayer`; only drawing and hit testing differ. The pause
+//! menu's Horizon layout is `pause`, below.
+use crate::{
+    hud::{HudAtlas, HudBatch},
+    multiplayer::{Outcome, Ping, Screen},
+    title::{Action, Mode, Title, list_worlds},
+    ui_theme::{
+        self as t, BODY, CONTROL, CONTROL_LARGE, Face, Kind, SIDEBAR, SMALL, Ui, color, id,
+    },
+};
+use std::time::Instant;
+
+const NAV: u64 = id("title.nav", 0);
+const QUIT: u64 = id("title.quit", 0);
+const PLAY: u64 = id("home.play", 0);
+const MULTIPLAYER: u64 = id("home.multiplayer", 0);
+const RESUME: u64 = id("home.resume", 0);
+const BACK: u64 = id("front.back", 0);
+const PLAY_WORLD: u64 = id("worlds.play", 0);
+const CREATE: u64 = id("worlds.create", 0);
+const WORLD: u64 = id("worlds.row", 0);
+const NAME: u64 = id("create.name", 0);
+const SEED: u64 = id("create.seed", 0);
+const MODE: u64 = id("create.mode", 0);
+const MAKE: u64 = id("create.make", 0);
+const SERVER: u64 = id("mp.row", 0);
+const JOIN: u64 = id("mp.join", 0);
+const DIRECT: u64 = id("mp.direct", 0);
+const ADD: u64 = id("mp.add", 0);
+const EDIT: u64 = id("mp.edit", 0);
+const DELETE: u64 = id("mp.delete", 0);
+const REFRESH: u64 = id("mp.refresh", 0);
+const FIELD_A: u64 = id("mp.field", 0);
+const FIELD_B: u64 = id("mp.field", 1);
+const DONE: u64 = id("mp.done", 0);
+
+/// The launcher's opening (`launcher/src/main.rs`): the wordmark holds over
+/// the backdrop, then the interface comes in. A click or a key skips ahead.
+#[derive(Clone, Copy, Debug)]
+pub struct Opening {
+    started: Instant,
+    reveal: Option<Instant>,
+}
+impl Opening {
+    pub fn new() -> Self {
+        Self {
+            started: Instant::now(),
+            reveal: None,
+        }
+    }
+    /// The reveal's progress, 0 to 1; `ready` says the backdrop is showing.
+    fn phase(&mut self, ready: bool) -> f32 {
+        let held = self.started.elapsed();
+        if self.reveal.is_none()
+            && ((held >= horizon_theme::OPENING_HOLD && ready)
+                || held >= horizon_theme::OPENING_MAX)
+        {
+            self.reveal = Some(Instant::now());
+        }
+        self.reveal.map_or(0.0, |at| {
+            at.elapsed().as_secs_f32() / horizon_theme::OPENING_REVEAL.as_secs_f32()
+        })
+    }
+    pub fn skip(&mut self) {
+        self.reveal.get_or_insert_with(Instant::now);
+    }
+}
+impl Default for Opening {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+/// Which sidebar item a mode belongs to.
+fn page(mode: &Mode) -> usize {
+    match mode {
+        Mode::Main => 0,
+        Mode::Select { .. } | Mode::Create { .. } => 1,
+        Mode::Multiplayer(_) => 2,
+    }
+}
+const PAGES: [&str; 4] = ["Home", "Singleplayer", "Multiplayer", "Options"];
+
+impl Title {
+    /// Horizon's layout for every title mode. `backdrop` is how much of the
+    /// live backdrop is visible (0 shows the plain cold background).
+    pub fn draw_horizon(&self, ui: &mut Ui, backdrop: f32) {
+        let reveal = self.opening_phase(backdrop >= 1.0);
+        if backdrop < 1.0 {
+            ui.cold_background(1.0 - backdrop);
+        }
+        let shade = t::ease_out_cubic(reveal);
+        let veil = if matches!(self.mode, Mode::Main) {
+            0.42
+        } else {
+            0.66
+        };
+        ui.atmosphere(veil * shade, shade);
+        let side = t::ease_out_cubic((reveal - 0.2) / 0.7);
+        let main = t::ease_out_cubic((reveal - 0.35) / 0.65);
+
+        // The sidebar slides in from the left.
+        ui.opacity = side;
+        ui.offset = (-16.0 * (1.0 - side), 0.0);
+        if side > 0.0 {
+            self.sidebar(ui);
+        }
+        // The content rises; each new page fades in and rises 8 over MOVE.
+        let entered = self.entered();
+        let p = t::ease_out_quint(entered.elapsed().as_secs_f32() / t::move_());
+        ui.opacity = main * p;
+        ui.offset = (0.0, 16.0 * (1.0 - main) + 8.0 * (1.0 - p));
+        if main > 0.0 {
+            let x = SIDEBAR + 48.0;
+            let w = (ui.w - x - 48.0).min(760.0);
+            match &self.mode {
+                Mode::Main => self.home(ui, x, w),
+                Mode::Select { worlds, selected } => worlds_page(ui, x, w, worlds, *selected),
+                Mode::Create {
+                    name,
+                    seed,
+                    creative,
+                    focus,
+                } => {
+                    let caret = (self.started.elapsed().as_millis() / 500).is_multiple_of(2);
+                    create_page(ui, x, w, name, seed, *creative, *focus, caret);
+                }
+                Mode::Multiplayer(screen) => {
+                    let caret = (self.started.elapsed().as_millis() / 500).is_multiple_of(2);
+                    multiplayer_page(ui, x, w, screen, caret);
+                }
+            }
+        }
+        ui.opacity = 1.0;
+        ui.offset = (0.0, 0.0);
+        if reveal < 1.0 {
+            // The wordmark rises and fades as the interface comes in.
+            let word = 1.0 - t::ease_out_cubic(reveal / 0.6);
+            ui.opacity = word;
+            let tw = ui.measure(Face::Display, t::WORDMARK, "Horizon");
+            let line = (t::WORDMARK * 1.2).round();
+            ui.text_line(
+                Face::Display,
+                t::WORDMARK,
+                line,
+                ((ui.w - tw) / 2.0).round(),
+                (ui.h - line) / 2.0 - 28.0 * (1.0 - word),
+                color::WHITE,
+                "Horizon",
+            );
+            ui.opacity = 1.0;
+        }
+    }
+    fn opening_phase(&self, ready: bool) -> f32 {
+        let mut opening = self.opening.get();
+        let phase = opening.as_mut().map_or(1.0, |o| o.phase(ready));
+        self.opening.set(opening.filter(|_| phase < 1.0));
+        phase.min(1.0)
+    }
+    /// A click or key during the opening jumps to the reveal; true if it did.
+    pub fn skip_opening(&self) -> bool {
+        let mut opening = self.opening.get();
+        let skipped = opening.as_mut().is_some_and(|o| {
+            let holding = o.reveal.is_none();
+            o.skip();
+            holding
+        });
+        self.opening.set(opening);
+        skipped
+    }
+    fn sidebar(&self, ui: &mut Ui) {
+        let h = ui.h;
+        ui.fill(0.0, 0.0, SIDEBAR, h, color::with_alpha(color::SIDEBAR, 0.8));
+        ui.vline(SIDEBAR - 1.0, 0.0, h, color::BORDER);
+        ui.text_line(
+            Face::Display,
+            22.0,
+            30.0,
+            22.0,
+            16.0,
+            color::TEXT,
+            "Horizon",
+        );
+        ui.sidebar_list(NAV, 12.0, 66.0, SIDEBAR - 24.0, &PAGES, page(&self.mode));
+        let qy = h - 12.0 - 18.0 - 12.0 - CONTROL;
+        let hover = ui.interact(QUIT, 12.0, qy, SIDEBAR - 24.0, CONTROL, true);
+        ui.rounded(
+            12.0,
+            qy,
+            SIDEBAR - 24.0,
+            CONTROL,
+            t::RADIUS,
+            color::with_alpha(color::HOVER, 0.7 * hover),
+        );
+        ui.text_line(
+            Face::Regular,
+            BODY,
+            CONTROL,
+            22.0,
+            qy,
+            color::mix(color::MUTED, color::TEXT, hover),
+            "Quit game",
+        );
+        ui.text(
+            Face::Regular,
+            SMALL,
+            22.0,
+            h - 12.0 - 18.0,
+            color::FAINT,
+            "Horizon 26.3",
+        );
+    }
+    /// Home: the launcher's Play page over the backdrop.
+    fn home(&self, ui: &mut Ui, x: f32, w: f32) {
+        let mut y = 36.0 + 28.0;
+        ui.text(
+            Face::Medium,
+            SMALL,
+            x,
+            y,
+            color::FAINT,
+            "Minecraft 26.3  ·  Java Edition, rewritten in Rust",
+        );
+        y += 22.0;
+        ui.text_line(Face::Display, t::HERO, 58.0, x, y, color::TEXT, "Horizon");
+        y += 58.0 + 12.0;
+        ui.text(
+            Face::Regular,
+            t::LARGE,
+            x,
+            y,
+            color::MUTED,
+            "The world you know, rebuilt from the ground up.",
+        );
+        y += 22.0 + 24.0;
+        let pw = ui.button_width("Singleplayer", true).max(120.0);
+        ui.button(
+            PLAY,
+            [x, y, pw, CONTROL_LARGE],
+            "Singleplayer",
+            Kind::Primary,
+            true,
+        );
+        let mw = ui.button_width("Multiplayer", true);
+        ui.button(
+            MULTIPLAYER,
+            [x + pw + 8.0, y, mw, CONTROL_LARGE],
+            "Multiplayer",
+            Kind::Secondary,
+            true,
+        );
+        y += CONTROL_LARGE + 24.0;
+        ui.divider(x, y, w);
+        let worlds = self.recent_worlds();
+        let last = worlds.first();
+        let value = last.map_or("None yet".to_owned(), |l| {
+            let secs = l
+                .modified
+                .duration_since(std::time::UNIX_EPOCH)
+                .map_or(0, |d| d.as_secs());
+            format!("{}  ·  {}", l.name, crate::title::date_label(secs))
+        });
+        let rh = ui.row(x, y, "Last played", &value, w - t::ROW_LABEL - 120.0);
+        if last.is_some() {
+            let bw = ui.button_width("Resume", false);
+            ui.button(
+                RESUME,
+                [x + w - bw, y + (rh - CONTROL) / 2.0, bw, CONTROL],
+                "Resume",
+                Kind::Secondary,
+                true,
+            );
+        }
+        y += rh;
+        ui.divider(x, y, w);
+        let count = match worlds.len() {
+            1 => "1 world".to_owned(),
+            n => format!("{n} worlds"),
+        };
+        y += ui.row(x, y, "Saves", &count, w - t::ROW_LABEL - 16.0);
+        ui.divider(x, y, w);
+        let note = "Not affiliated with Mojang or Microsoft";
+        ui.text(
+            Face::Regular,
+            SMALL,
+            x,
+            ui.h - 12.0 - 18.0,
+            color::FAINT,
+            note,
+        );
+    }
+    /// A click in Horizon's layout (`x`, `y` in GUI pixels).
+    pub fn click_horizon(
+        &mut self,
+        atlas: &HudAtlas,
+        batch: &mut HudBatch,
+        x: f32,
+        y: f32,
+    ) -> Action {
+        if self.skip_opening() {
+            return Action::None;
+        }
+        let hit = {
+            let mut ui = Ui::dry(atlas, batch, (x, y));
+            self.draw_horizon(&mut ui, 1.0);
+            ui.hit((x, y))
+        };
+        let Some(hit) = hit else {
+            if let Mode::Create { focus, .. } = &mut self.mode {
+                *focus = 2;
+            }
+            return Action::None;
+        };
+        let saves = self.saves.clone();
+        let select = |saves: &std::path::Path| Mode::Select {
+            worlds: list_worlds(saves),
+            selected: None,
+        };
+        match hit {
+            QUIT => return Action::Quit,
+            h if h == NAV => {
+                self.mode = Mode::Main;
+                return Action::None;
+            }
+            h if h == NAV + 1 => {
+                if !matches!(self.mode, Mode::Select { .. }) {
+                    self.mode = select(&saves);
+                }
+                return Action::None;
+            }
+            h if h == NAV + 2 => {
+                if !matches!(self.mode, Mode::Multiplayer(_)) {
+                    self.mode = Mode::Multiplayer(Screen::list(&saves));
+                }
+                return Action::None;
+            }
+            h if h == NAV + 3 => return Action::Options,
+            _ => {}
+        }
+        match &mut self.mode {
+            Mode::Main => match hit {
+                PLAY => self.mode = select(&saves),
+                MULTIPLAYER => self.mode = Mode::Multiplayer(Screen::list(&saves)),
+                RESUME => {
+                    if let Some(w) = list_worlds(&saves).into_iter().next() {
+                        return Action::Play { folder: w.folder };
+                    }
+                }
+                _ => {}
+            },
+            Mode::Select { worlds, selected } => match hit {
+                PLAY_WORLD => {
+                    if let Some(w) = selected.and_then(|i| worlds.get(i)) {
+                        return Action::Play {
+                            folder: w.folder.clone(),
+                        };
+                    }
+                }
+                CREATE => {
+                    self.mode = Mode::Create {
+                        name: "New World".into(),
+                        seed: String::new(),
+                        creative: false,
+                        focus: 0,
+                    }
+                }
+                h if (WORLD..WORLD + 10_000).contains(&h) => {
+                    let i = (h - WORLD) as usize;
+                    if *selected == Some(i) {
+                        return Action::Play {
+                            folder: worlds[i].folder.clone(),
+                        };
+                    }
+                    *selected = Some(i);
+                }
+                _ => {}
+            },
+            Mode::Create {
+                creative, focus, ..
+            } => match hit {
+                BACK => self.mode = select(&saves),
+                NAME => *focus = 0,
+                SEED => *focus = 1,
+                h if h == MODE || h == MODE + 1 => *creative = h == MODE + 1,
+                MAKE => return self.create_action(),
+                _ => {}
+            },
+            Mode::Multiplayer(screen) => {
+                let id = match hit {
+                    JOIN => Some(40),
+                    DIRECT => Some(41),
+                    ADD => Some(42),
+                    EDIT => Some(43),
+                    DELETE => Some(44),
+                    REFRESH => Some(45),
+                    BACK => Some(match screen {
+                        Screen::List { .. } => 46,
+                        Screen::Edit { .. } => 51,
+                        Screen::Direct { .. } => 53,
+                        Screen::Disconnected { .. } => 54,
+                    }),
+                    DONE => Some(match screen {
+                        Screen::Direct { .. } => 52,
+                        _ => 50,
+                    }),
+                    FIELD_A | FIELD_B => {
+                        if let Screen::Edit { focus, .. } = screen {
+                            *focus = u8::from(hit == FIELD_B);
+                        }
+                        None
+                    }
+                    h if (SERVER..SERVER + 10_000).contains(&h) => {
+                        let i = (h - SERVER) as usize;
+                        let again =
+                            matches!(screen, Screen::List { selected, .. } if *selected == Some(i));
+                        if again {
+                            if let Some(address) = screen.address_of(i) {
+                                return Action::Connect { address };
+                            }
+                        } else if let Screen::List { selected, .. } = screen {
+                            *selected = Some(i);
+                        }
+                        None
+                    }
+                    _ => None,
+                };
+                if let Some(id) = id {
+                    match screen.click(Some(id), 0.0, 0.0, (0.0, 0.0), &saves) {
+                        Outcome::Back => self.mode = Mode::Main,
+                        Outcome::Connect(address) => return Action::Connect { address },
+                        Outcome::None => {}
+                    }
+                }
+            }
+        }
+        Action::None
+    }
+}
+
+/// The page header plus a row of actions under it; returns the y below.
+fn header(ui: &mut Ui, x: f32, title: &str, description: &str) -> f32 {
+    let y = 36.0;
+    y + ui.page_header(x, y, title, description) + 24.0
+}
+/// Actions laid out right to left from `right`; returns the left edge.
+fn actions_right(ui: &mut Ui, right: f32, y: f32, items: &[(u64, &str, Kind, bool)]) -> f32 {
+    let mut rx = right;
+    for &(bid, label, kind, on) in items {
+        let large = kind == Kind::Primary;
+        let (bw, bh) = if large {
+            (ui.button_width(label, true).max(120.0), CONTROL_LARGE)
+        } else {
+            (ui.button_width(label, false), CONTROL)
+        };
+        rx -= bw;
+        ui.button(
+            bid,
+            [rx, y + (CONTROL_LARGE - bh) / 2.0, bw, bh],
+            label,
+            kind,
+            on,
+        );
+        rx -= 8.0;
+    }
+    rx
+}
+/// A selectable list row: the launcher's row look with a hover layer and
+/// the raised selection with its 1px border. Returns the row height.
+#[allow(clippy::too_many_arguments)]
+fn list_row(
+    ui: &mut Ui,
+    rid: u64,
+    x: f32,
+    y: f32,
+    w: f32,
+    selected: bool,
+    title: &str,
+    meta: &str,
+    right: &str,
+    dot: Option<u32>,
+) -> f32 {
+    let h = 60.0;
+    let hover = ui.interact(rid, x - 12.0, y + 2.0, w + 24.0, h - 4.0, true);
+    let sel = ui.tween(rid ^ 0x5e1ec7, if selected { 1.0 } else { 0.0 }, t::quick());
+    ui.rounded(
+        x - 12.0,
+        y + 4.0,
+        w + 24.0,
+        h - 8.0,
+        t::RADIUS,
+        color::with_alpha(color::HOVER, 0.7 * hover),
+    );
+    ui.rounded(
+        x - 12.0,
+        y + 4.0,
+        w + 24.0,
+        h - 8.0,
+        t::RADIUS,
+        color::with_alpha(color::RAISED, sel),
+    );
+    ui.border(
+        x - 12.0,
+        y + 4.0,
+        w + 24.0,
+        h - 8.0,
+        t::RADIUS,
+        color::with_alpha(color::BORDER, sel),
+    );
+    let mut tx = x;
+    if let Some(dot) = dot {
+        ui.rounded(x, y + 17.0, 6.0, 6.0, 3.0, dot);
+        tx += 16.0;
+    }
+    let title = ui.fit(Face::Medium, BODY, title, w - 200.0);
+    ui.text(Face::Medium, BODY, tx, y + 10.0, color::TEXT, &title);
+    let meta = ui.fit(Face::Regular, SMALL, meta, w - 200.0);
+    ui.text(Face::Regular, SMALL, tx, y + 31.0, color::MUTED, &meta);
+    ui.text_right(Face::Regular, SMALL, x + w, y + 21.0, color::FAINT, right);
+    ui.divider(x, y + h, w);
+    h
+}
+/// An empty list: a serif line and a hint.
+fn empty(ui: &mut Ui, x: f32, y: f32, title: &str, hint: &str) {
+    ui.text_line(Face::Display, 22.0, 30.0, x, y + 32.0, color::TEXT, title);
+    ui.text(Face::Regular, BODY, x, y + 66.0, color::MUTED, hint);
+}
+
+fn worlds_page(
+    ui: &mut Ui,
+    x: f32,
+    w: f32,
+    worlds: &[crate::title::WorldEntry],
+    selected: Option<usize>,
+) {
+    let count = match worlds.len() {
+        0 => "No worlds yet. They live in the saves folder.".to_owned(),
+        1 => "1 world in the saves folder.".to_owned(),
+        n => format!("{n} worlds in the saves folder."),
+    };
+    let mut y = header(ui, x, "Singleplayer", &count);
+    actions_right(
+        ui,
+        x + w,
+        y - 24.0 - 58.0,
+        &[
+            (PLAY_WORLD, "Play", Kind::Primary, selected.is_some()),
+            (CREATE, "Create world", Kind::Secondary, true),
+        ],
+    );
+    ui.divider(x, y, w);
+    if worlds.is_empty() {
+        empty(ui, x, y, "A blank map.", "Create a world to begin.");
+        return;
+    }
+    let bottom = ui.h - 36.0;
+    for (i, world) in worlds.iter().enumerate() {
+        if y + 60.0 > bottom {
+            break;
+        }
+        let secs = world
+            .modified
+            .duration_since(std::time::UNIX_EPOCH)
+            .map_or(0, |d| d.as_secs());
+        let meta = format!("{}  ·  {}", crate::title::date_label(secs), world.folder);
+        let mode = if world.creative {
+            "Creative"
+        } else {
+            "Survival"
+        };
+        y += list_row(
+            ui,
+            WORLD + i as u64,
+            x,
+            y,
+            w,
+            selected == Some(i),
+            &world.name,
+            &meta,
+            mode,
+            None,
+        );
+    }
+}
+
+#[allow(clippy::too_many_arguments)]
+fn create_page(
+    ui: &mut Ui,
+    x: f32,
+    w: f32,
+    name: &str,
+    seed: &str,
+    creative: bool,
+    focus: u8,
+    caret: bool,
+) {
+    let mut y = header(
+        ui,
+        x,
+        "Create world",
+        "Generated by Horizon from the seed, as vanilla would.",
+    );
+    actions_right(
+        ui,
+        x + w,
+        y - 24.0 - 58.0,
+        &[
+            (MAKE, "Create", Kind::Primary, true),
+            (BACK, "Cancel", Kind::Ghost, true),
+        ],
+    );
+    ui.divider(x, y, w);
+    let fx = x + t::ROW_LABEL + 16.0;
+    let fw = (w - t::ROW_LABEL - 16.0).min(360.0);
+    for (i, label) in ["World name", "Seed", "Game mode"].iter().enumerate() {
+        let rh = 12.0 + CONTROL + 12.0;
+        ui.text_line(Face::Regular, BODY, rh, x, y, color::MUTED, label);
+        let r = [fx, y + 12.0, fw, CONTROL];
+        match i {
+            0 => ui.field(NAME, r, name, "New World", focus == 0, caret),
+            1 => ui.field(SEED, r, seed, "Random", focus == 1, caret),
+            _ => {
+                ui.segmented(
+                    MODE,
+                    fx,
+                    y + 12.0,
+                    &["Survival", "Creative"],
+                    usize::from(creative),
+                );
+            }
+        }
+        y += rh;
+        ui.divider(x, y, w);
+    }
+}
+
+fn multiplayer_page(ui: &mut Ui, x: f32, w: f32, screen: &Screen, caret: bool) {
+    match screen {
+        Screen::List {
+            servers,
+            selected,
+            pings,
+            lan,
+        } => {
+            let games = lan.games();
+            let sub = match servers.len() {
+                0 => "No saved servers. Worlds opened to LAN show up here too.".to_owned(),
+                1 => "1 saved server, and worlds opened to LAN.".to_owned(),
+                n => format!("{n} saved servers, and worlds opened to LAN."),
+            };
+            let mut y = header(ui, x, "Multiplayer", &sub);
+            let has = selected.is_some();
+            let saved = selected.is_some_and(|i| i < servers.len());
+            let mut items = vec![
+                (JOIN, "Join", Kind::Primary, has),
+                (ADD, "Add server", Kind::Secondary, true),
+                (DIRECT, "Direct connect", Kind::Secondary, true),
+                (REFRESH, "Refresh", Kind::Ghost, true),
+            ];
+            if saved {
+                items.push((EDIT, "Edit", Kind::Ghost, true));
+                items.push((DELETE, "Delete", Kind::Danger, true));
+            }
+            actions_right(ui, x + w, y - 24.0 - 58.0, &items);
+            ui.divider(x, y, w);
+            let pings = pings.lock().map(|p| p.clone()).unwrap_or_default();
+            let mut rows: Vec<(String, String, String, u32)> = servers
+                .iter()
+                .map(|s| {
+                    let (line, right, dot) = match pings.get(&s.ip) {
+                        Some(Ping::Ok {
+                            motd, players, ms, ..
+                        }) => (
+                            motd.lines().next().unwrap_or("").trim().to_owned(),
+                            format!("{players}  ·  {ms} ms"),
+                            color::ACCENT,
+                        ),
+                        Some(Ping::Failed(_)) => (
+                            "Can't reach the server".to_owned(),
+                            String::new(),
+                            color::DANGER,
+                        ),
+                        _ => ("Pinging…".to_owned(), String::new(), color::FAINT),
+                    };
+                    (s.name.clone(), format!("{line}  ·  {}", s.ip), right, dot)
+                })
+                .collect();
+            rows.extend(games.iter().map(|g| {
+                (
+                    "LAN world".to_owned(),
+                    format!("{}  ·  {}", g.motd, g.address),
+                    "On your network".to_owned(),
+                    color::ACCENT,
+                )
+            }));
+            if rows.is_empty() {
+                empty(
+                    ui,
+                    x,
+                    y,
+                    "Nobody here yet.",
+                    "Add a server, connect directly, or open a world to LAN.",
+                );
+                return;
+            }
+            let bottom = ui.h - 36.0;
+            for (i, (name, meta, right, dot)) in rows.iter().enumerate() {
+                if y + 60.0 > bottom {
+                    break;
+                }
+                y += list_row(
+                    ui,
+                    SERVER + i as u64,
+                    x,
+                    y,
+                    w,
+                    *selected == Some(i),
+                    name,
+                    meta,
+                    right,
+                    Some(*dot),
+                );
+            }
+        }
+        Screen::Edit {
+            index,
+            name,
+            address,
+            focus,
+        } => {
+            let title = if index.is_some() {
+                "Edit server"
+            } else {
+                "Add server"
+            };
+            let mut y = header(
+                ui,
+                x,
+                title,
+                "Saved to servers.dat, like vanilla's server list.",
+            );
+            let ok = horizon_protocol::servers::parse_address(address).is_some();
+            actions_right(
+                ui,
+                x + w,
+                y - 24.0 - 58.0,
+                &[
+                    (DONE, "Save", Kind::Primary, ok),
+                    (BACK, "Cancel", Kind::Ghost, true),
+                ],
+            );
+            ui.divider(x, y, w);
+            let fx = x + t::ROW_LABEL + 16.0;
+            let fw = (w - t::ROW_LABEL - 16.0).min(360.0);
+            for (i, (label, value, hint)) in [
+                ("Name", name, "Minecraft Server"),
+                ("Address", address, "play.example.net"),
+            ]
+            .iter()
+            .enumerate()
+            {
+                let rh = 12.0 + CONTROL + 12.0;
+                ui.text_line(Face::Regular, BODY, rh, x, y, color::MUTED, label);
+                let fid = if i == 0 { FIELD_A } else { FIELD_B };
+                ui.field(
+                    fid,
+                    [fx, y + 12.0, fw, CONTROL],
+                    value,
+                    hint,
+                    usize::from(*focus) == i,
+                    caret,
+                );
+                y += rh;
+                ui.divider(x, y, w);
+            }
+        }
+        Screen::Direct { address } => {
+            let y = header(
+                ui,
+                x,
+                "Direct connect",
+                "Join a server once without saving it.",
+            );
+            let ok = horizon_protocol::servers::parse_address(address).is_some();
+            actions_right(
+                ui,
+                x + w,
+                y - 24.0 - 58.0,
+                &[
+                    (DONE, "Join", Kind::Primary, ok),
+                    (BACK, "Cancel", Kind::Ghost, true),
+                ],
+            );
+            ui.divider(x, y, w);
+            let rh = 12.0 + CONTROL + 12.0;
+            ui.text_line(Face::Regular, BODY, rh, x, y, color::MUTED, "Address");
+            let fx = x + t::ROW_LABEL + 16.0;
+            ui.field(
+                FIELD_A,
+                [fx, y + 12.0, (w - t::ROW_LABEL - 16.0).min(360.0), CONTROL],
+                address,
+                "host:port",
+                true,
+                caret,
+            );
+            ui.divider(x, y + rh, w);
+        }
+        Screen::Disconnected { reason } => {
+            let mut y = header(
+                ui,
+                x,
+                "Connection lost",
+                "The server closed the connection.",
+            );
+            ui.divider(x, y, w);
+            y += 16.0;
+            // The launcher's error note: a danger dot beside the message.
+            let lines = wrap(ui, reason, w - 40.0);
+            let box_h = 24.0 + lines.len() as f32 * 19.0;
+            ui.rounded(x, y, w, box_h, t::RADIUS, color::RAISED);
+            ui.border(x, y, w, box_h, t::RADIUS, color::BORDER);
+            ui.rounded(x + 12.0, y + 18.0, 6.0, 6.0, 3.0, color::DANGER);
+            for (i, line) in lines.iter().enumerate() {
+                ui.text_line(
+                    Face::Regular,
+                    BODY,
+                    19.0,
+                    x + 28.0,
+                    y + 12.0 + i as f32 * 19.0,
+                    color::TEXT,
+                    line,
+                );
+            }
+            y += box_h + 16.0;
+            let bw = ui.button_width("Back to servers", false);
+            ui.button(
+                BACK,
+                [x, y, bw, CONTROL],
+                "Back to servers",
+                Kind::Secondary,
+                true,
+            );
+        }
+    }
+}
+/// Greedy word wrap in dp.
+pub fn wrap(ui: &Ui, text: &str, width: f32) -> Vec<String> {
+    let mut lines = Vec::new();
+    for para in text.lines() {
+        let mut line = String::new();
+        for word in para.split_whitespace() {
+            let next = if line.is_empty() {
+                word.to_owned()
+            } else {
+                format!("{line} {word}")
+            };
+            if !line.is_empty() && ui.measure(Face::Regular, BODY, &next) > width {
+                lines.push(std::mem::replace(&mut line, word.to_owned()));
+            } else {
+                line = next;
+            }
+        }
+        lines.push(line);
+    }
+    lines
+}
+
+/// The pause menu in Horizon's style: the launcher's sidebar over the
+/// blurred world, with the game's actions as a page. Ids match
+/// `game/screens.rs`'s PauseScreen actions: 0 back to game, 1 options,
+/// 2 save and quit, 3 statistics, 4 advancements, 9 world options.
+pub mod pause {
+    use super::*;
+    fn act(a: u8) -> u64 {
+        id("pause", u64::from(a))
+    }
+    pub fn draw(ui: &mut Ui, world: &str, quit_label: &str, opened: Instant) {
+        let (w, h) = (ui.w, ui.h);
+        let p = t::ease_out_quint(opened.elapsed().as_secs_f32() / t::move_());
+        ui.opacity = p;
+        ui.atmosphere(0.35, 1.0);
+        ui.offset = (-16.0 * (1.0 - p), 0.0);
+        ui.fill(0.0, 0.0, SIDEBAR, h, color::with_alpha(color::SIDEBAR, 0.8));
+        ui.vline(SIDEBAR - 1.0, 0.0, h, color::BORDER);
+        ui.text_line(
+            Face::Display,
+            22.0,
+            30.0,
+            22.0,
+            16.0,
+            color::TEXT,
+            "Horizon",
+        );
+        ui.sidebar_list(
+            id("pause.nav", 0),
+            12.0,
+            66.0,
+            SIDEBAR - 24.0,
+            &["Game", "Advancements", "Statistics", "Options"],
+            0,
+        );
+        ui.text(
+            Face::Regular,
+            SMALL,
+            22.0,
+            h - 12.0 - 18.0,
+            color::FAINT,
+            "Horizon 26.3",
+        );
+        ui.offset = (0.0, 8.0 * (1.0 - p));
+        let x = SIDEBAR + 48.0;
+        let cw = (w - x - 48.0).min(760.0);
+        let mut y = 36.0;
+        ui.text(Face::Medium, SMALL, x, y, color::FAINT, "Game paused");
+        y += 22.0;
+        let title = ui.fit(Face::Display, t::HERO, world, cw);
+        ui.text_line(Face::Display, t::HERO, 58.0, x, y, color::TEXT, &title);
+        y += 58.0 + 24.0;
+        let bw = ui.button_width("Back to game", true).max(120.0);
+        ui.button(
+            act(0),
+            [x, y, bw, CONTROL_LARGE],
+            "Back to game",
+            Kind::Primary,
+            true,
+        );
+        let lw = ui.button_width("Open to LAN", true);
+        ui.button(
+            act(9),
+            [x + bw + 8.0, y, lw, CONTROL_LARGE],
+            "Open to LAN",
+            Kind::Secondary,
+            true,
+        );
+        y += CONTROL_LARGE + 24.0;
+        ui.divider(x, y, cw);
+        let rh = ui.row(
+            x,
+            y,
+            "Leave",
+            "Saves the world, then returns to the title.",
+            cw - t::ROW_LABEL - 220.0,
+        );
+        let qw = ui.button_width(quit_label, false);
+        ui.button(
+            act(2),
+            [x + cw - qw, y + (rh - CONTROL) / 2.0, qw, CONTROL],
+            quit_label,
+            Kind::Danger,
+            true,
+        );
+        y += rh;
+        ui.divider(x, y, cw);
+        ui.opacity = 1.0;
+        ui.offset = (0.0, 0.0);
+    }
+    /// The PauseScreen action under a click, if any.
+    pub fn click(
+        atlas: &HudAtlas,
+        batch: &mut HudBatch,
+        x: f32,
+        y: f32,
+        world: &str,
+        quit_label: &str,
+    ) -> Option<u8> {
+        let mut ui = Ui::dry(atlas, batch, (x, y));
+        draw(
+            &mut ui,
+            world,
+            quit_label,
+            Instant::now() - std::time::Duration::from_secs(5),
+        );
+        let hit = ui.hit((x, y))?;
+        let nav = id("pause.nav", 0);
+        match hit {
+            h if h == nav => Some(0),
+            h if h == nav + 1 => Some(4),
+            h if h == nav + 2 => Some(3),
+            h if h == nav + 3 => Some(1),
+            h => [0u8, 1, 2, 3, 4, 9].into_iter().find(|&a| act(a) == h),
+        }
+    }
+}

crates/horizon-client/src/game.rs

@@ -4,6 +4,7 @@ mod advancements;
 mod advancements_screen;
 mod allays;
 mod armor_stands;
+mod backdrop;
 mod banners;
 mod beacon;
 mod block_entity_anims;
@@ -694,6 +695,10 @@ struct Game<'a> {
     settings: Settings,
     /// Where the options screen returns: true = title, false = pause menu.
     options_from_title: bool,
+    /// The live title backdrop (game/backdrop.rs).
+    backdrop: backdrop::Backdrop,
+    /// When the pause menu opened (Horizon style's entrance).
+    pause_since: Option<Instant>,
     dragging: bool,
     /// `ClientAvatarState`: walked distance and view bob.
     avatar: horizon_client::camera::AvatarBob,
@@ -743,6 +748,10 @@ struct Game<'a> {
     dragon_model: Option<horizon_client::mobs::Part>,
     /// Map textures waiting for the next HUD batch to upload them.
     map_patches: Vec<horizon_client::font::Patch>,
+    /// Player skin downloads, and which skin each atlas skin slot holds
+    /// (least recently shown first).
+    skin_downloads: horizon_client::skins::Downloader,
+    skin_slots: Vec<(String, usize)>,
     cart_models: minecarts::CartModels,
     /// The boat the player rides.
     riding: Option<u32>,
@@ -751,8 +760,6 @@ struct Game<'a> {
     ender_open: Option<(i32, i32, i32)>,
     /// Block entity data of broken blocks waiting for their dropped item.
     pending: spill::Pending,
-    /// The chest each copper golem has open (`CopperGolem.openedChestPos`).
-    golem_openers: HashMap<u32, (i32, i32, i32)>,
     /// Item entities spawned and block entities removed while the block
     /// behaviour ran (spilled contents, popped resources).
     spill: spill::Spill,
@@ -2812,7 +2819,7 @@ impl Game<'_> {
         self.spawn_loaded_entities();
         if running {
             self.tick_mobs()?;
-            self.tick_copper_golems();
+            self.recheck_golem_openers();
             self.tick_experience();
         }
         self.tick_lan();
@@ -2967,7 +2974,15 @@ impl Game<'_> {
             return batch;
         }
         if let Some(title) = &self.title {
-            title.draw(&self.res.atlas, &mut batch, self.cursor);
+            if horizon_client::ui_theme::horizon() {
+                let fade = self.backdrop_fade();
+                let mut ui =
+                    horizon_client::ui_theme::Ui::new(&self.res.atlas, &mut batch, self.cursor);
+                title.draw_horizon(&mut ui, fade);
+                ui.finish();
+            } else {
+                title.draw(&self.res.atlas, &mut batch, self.cursor);
+            }
             return batch;
         }
         let atlas_ptr: *const HudAtlas = &self.res.atlas;
@@ -2992,7 +3007,8 @@ impl Game<'_> {
         // the sleep overlay, debug screen and open screens still draw.
         let spectator = self.spectator();
         let (wi, hi) = (w as i32, h as i32);
-        if !self.ui.hide_gui {
+        // Horizon's pause menu sits over the blurred world alone.
+        if !self.ui.hide_gui && !self.horizon_pause() {
             self.draw_spyglass(&mut batch);
             // Hud.extractCrosshair / extractItemHotbar / extractPlayerHealth /
             // extractVehicleHealth and the experience bar, laid out by hud_layout.
@@ -5236,7 +5252,28 @@ impl Game<'_> {
             dim.id(),
         )));
         let res = &*self.res;
-        let mut streaming = if self.options.test_terrain && dim == Dim::Overworld {
+        let flat = (dim == Dim::Overworld)
+            .then(|| horizon_client::save::world_gen_settings(world_root))
+            .flatten()
+            .and_then(|s| {
+                horizon_client::flatgen::FlatTerrain::from_settings(
+                    &s,
+                    res.assets.registry,
+                    &res.biomes,
+                )
+            });
+        let mut streaming = if let Some(inner) = flat {
+            Streaming::new(
+                Arc::new(Persistent {
+                    inner: Arc::new(inner),
+                    save: save.clone(),
+                    registry: res.assets.clone(),
+                    biomes: res.biomes.clone(),
+                }),
+                res.context.clone(),
+                res.threads,
+            )
+        } else if self.options.test_terrain && dim == Dim::Overworld {
             let inner = Arc::new(TestTerrain::new(res.assets.registry, &res.biomes)?);
             Streaming::new(
                 Arc::new(Persistent {
@@ -7127,7 +7164,13 @@ impl Game<'_> {
             return Ok(false);
         };
         let alpha = self.clock.fraction();
-        let (camera, underwater, view_yaw, view_pitch) = match self.camera_view(alpha as f32) {
+        let live = self.backdrop_live();
+        let view = if live {
+            self.backdrop_view()
+        } else {
+            self.camera_view(alpha as f32)
+        };
+        let (camera, underwater, view_yaw, view_pitch) = match view {
             Some((c, yaw, pitch)) => {
                 let s =
                     self.world
@@ -7213,7 +7256,7 @@ impl Game<'_> {
                 entities.extend(dragon);
             }
         }
-        let celestial = if title {
+        let celestial = if title && !live {
             self.panorama_geometry()
         } else if self.dim == Dim::Overworld
             && self.potions.effects.get("darkness").is_none()
@@ -7239,12 +7282,14 @@ impl Game<'_> {
         if !title {
             self.end_geometry(camera, &mut entities);
         }
-        if !title && self.dim == Dim::Overworld {
+        if (!title || live) && self.dim == Dim::Overworld {
             self.cloud_geometry(&sky, camera, alpha, &mut entities);
             self.weather_geometry(camera, alpha, &mut entities);
         }
         // PanoramaRenderer: the title cube spins at 0.1 degrees per tick, pitched 10 degrees.
-        let (yaw, pitch) = if title {
+        let (yaw, pitch) = if live {
+            (view_yaw, view_pitch)
+        } else if title {
             (-(self.started.elapsed().as_secs_f32() * 2.0) % 360.0, 10.0)
         } else {
             (view_yaw, view_pitch)
@@ -7264,7 +7309,9 @@ impl Game<'_> {
             camera,
             yaw,
             pitch,
-            fov_degrees: if title {
+            fov_degrees: if live {
+                72.0
+            } else if title {
                 85.0
             } else {
                 self.fov_degrees(alpha as f32, camera.to_array())
@@ -7277,7 +7324,7 @@ impl Game<'_> {
             sky,
             distance: (self.streaming.radius * 16) as f32,
             underwater,
-            title,
+            title: title && !live,
             skybox: self.dim == Dim::Overworld,
             end_sky: self.dim == Dim::End,
             environment_fog: (self.dim == Dim::Nether).then_some((sky.fog_start, sky.fog_end)),
@@ -7311,6 +7358,13 @@ impl Game<'_> {
             darkness: self.darkness_lighting(alpha as f32),
             night_vision: self.night_vision_intensity(),
             block_flicker: self.res.fog.state.block_light_flicker,
+            post: if live {
+                Some(horizon_client::post::PostGrade::FROST)
+            } else if self.horizon_pause() {
+                Some(horizon_client::post::PostGrade::PAUSE)
+            } else {
+                None
+            },
         };
         self.renderer.as_mut().ok_or("renderer")?.render(&frame)
     }
@@ -7604,6 +7658,15 @@ impl ApplicationHandler for Game<'_> {
         ) {
             self.last_input = Instant::now();
         }
+        if let WindowEvent::MouseInput {
+            state,
+            button: MouseButton::Left,
+            ..
+        } = &event
+        {
+            // The press state of Horizon-style buttons.
+            horizon_client::ui_theme::set_pressed(*state == ElementState::Pressed);
+        }
         let result: Result<()> = (|| {
             match event {
                 WindowEvent::CloseRequested => {
@@ -7729,9 +7792,14 @@ impl ApplicationHandler for Game<'_> {
                         .as_ref()
                         .map(|r| [r.config.width, r.config.height])
                         .unwrap_or([1, 1]);
-                    let b = HudBatch::new(size);
+                    let mut b = HudBatch::new(size);
+                    let atlas = &self.res.atlas;
                     let action = self.title.as_mut().map_or(Action::None, |t| {
-                        t.click(self.cursor.0, self.cursor.1, (b.width, b.height))
+                        if horizon_client::ui_theme::horizon() {
+                            t.click_horizon(atlas, &mut b, self.cursor.0, self.cursor.1)
+                        } else {
+                            t.click(self.cursor.0, self.cursor.1, (b.width, b.height))
+                        }
                     });
                     match action {
                         Action::Quit => event_loop.exit(),
@@ -7897,6 +7965,7 @@ impl ApplicationHandler for Game<'_> {
                 WindowEvent::KeyboardInput { event, .. } if self.title.is_some() => {
                     if event.state == ElementState::Pressed
                         && let Some(title) = self.title.as_mut()
+                        && !title.skip_opening()
                     {
                         match event.physical_key {
                             PhysicalKey::Code(KeyCode::Backspace) => title.backspace(),
@@ -7978,6 +8047,11 @@ impl ApplicationHandler for Game<'_> {
                     self.pitch = (self.pitch
                         + (turn(KeyCode::ArrowDown) - turn(KeyCode::ArrowUp)) * 90.0 * secs)
                         .clamp(-90.0, 90.0);
+                    self.update_backdrop()?;
+                    horizon_client::ui_theme::set_backdrop(self.backdrop_fade());
+                    if self.screen != Screen::Paused {
+                        self.pause_since = None;
+                    }
                     if self.title.is_none() {
                         self.update_world();
                         self.spawn_player()?;
@@ -7990,6 +8064,8 @@ impl ApplicationHandler for Game<'_> {
                             self.tick()?;
                             self.tick_ambience();
                             self.tick_fov();
+                        } else if self.title.is_some() {
+                            self.tick_backdrop();
                         }
                         self.tick_music();
                         self.tick_sound_engine();
@@ -8223,6 +8299,14 @@ pub fn run() -> Result<()> {
     let now = Instant::now();
     let game_root = options.resources.clone();
     let mut settings = Settings::load(&std::env::current_dir()?.join("options.txt"));
+    horizon_client::ui_theme::load_preferences(&std::env::current_dir()?);
+    // Scripted and frame-limited runs (the parity harnesses) see vanilla's
+    // screens unless HORIZON_MENU_STYLE asks otherwise.
+    if (options.frames.is_some() || options.control.is_some())
+        && std::env::var_os("HORIZON_MENU_STYLE").is_none()
+    {
+        horizon_client::ui_theme::set_style(horizon_client::ui_theme::MenuStyle::Classic);
+    }
     if let Some(d) = options.distance_override {
         settings.render_distance = d;
     }
@@ -8340,6 +8424,8 @@ pub fn run() -> Result<()> {
         hand_item: None,
         settings,
         options_from_title: false,
+        backdrop: Default::default(),
+        pause_since: None,
         dragging: false,
         avatar: Default::default(),
         flash: 0,
@@ -8379,12 +8465,17 @@ pub fn run() -> Result<()> {
         breath_clouds: Vec::new(),
         dragon_model: horizon_client::mobs::load_model(&root, "minecraft:ender_dragon#main"),
         map_patches: Vec::new(),
+        skin_downloads: horizon_client::skins::Downloader::new(
+            std::env::current_dir()
+                .unwrap_or_default()
+                .join("assets/skins"),
+        ),
+        skin_slots: Vec::new(),
         cart_models: minecarts::CartModels::load(&root),
         riding: None,
         ender_items: vec![None; 27],
         ender_open: None,
         pending: Default::default(),
-        golem_openers: HashMap::new(),
         spill: Default::default(),
         recipe_ui: Default::default(),
         mount_menu: Default::default(),
@@ -8465,7 +8556,16 @@ pub fn run() -> Result<()> {
             let (seed, creative) = (game.options.seed, game.options.creative);
             game.open_world(&folder, None, Some(seed), creative)?;
         }
-        None => game.title = Some(Title::new(std::env::current_dir()?.join("saves"))),
+        None => {
+            let title = Title::new(std::env::current_dir()?.join("saves"));
+            // The launcher's opening, once per session and only in Horizon's style.
+            if horizon_client::ui_theme::horizon() && game.options.frames.is_none() {
+                title
+                    .opening
+                    .set(Some(horizon_client::front::Opening::new()));
+            }
+            game.title = Some(title);
+        }
     }
     if let (Some(script), Some(output)) = (
         std::env::var_os("HORIZON_COMMAND_SCRIPT"),

crates/horizon-client/src/game/backdrop.rs

@@ -0,0 +1,245 @@
+//! The live title backdrop (Menu style: Horizon): a frozen landscape that
+//! Horizon generates and renders itself behind the title screens, seen
+//! through a slow orbiting camera, falling snow, an overcast sky and the cold
+//! blur and grade of `gfx::PostGrade`. Nothing is bundled: the chunks come
+//! from the vanilla generator for a fixed seed and are cached in
+//! `saves/.horizon-title/backdrop` (no level.dat, so no world list entry).
+//! The ice-spikes spot is found once with `/locate biome`'s search and kept
+//! in `spot.txt` there.
+use super::Game;
+use horizon_client::{
+    Result,
+    save::{Persistent, SaveDir},
+    streaming::Streaming,
+    vanillagen::VanillaTerrain,
+    world::{Weather, World},
+};
+use horizon_core::biome::{BiomeZoom, obfuscate_seed};
+use std::{
+    sync::{Arc, Mutex},
+    time::Instant,
+};
+
+/// The world the backdrop is cut from (HORIZON_BACKDROP_SEED overrides it).
+const SEED: i64 = 2_026_031_337;
+/// The biome the camera looks for.
+const BIOME: &str = "minecraft:ice_spikes";
+/// Late morning: the snow reads clearly; the grade (`PostGrade::FROST`) makes it cold.
+const DAY_TIME: i64 = 4_000;
+
+#[derive(Default)]
+pub(super) struct Backdrop {
+    pub active: bool,
+    /// The search for the spot, then the spot (block x, z).
+    spot: Arc<Mutex<Option<Option<(i32, i32)>>>>,
+    centred: bool,
+    /// Camera position once the ground under it has loaded.
+    pub camera: Option<glam::DVec3>,
+    pub ready: Option<Instant>,
+    pub started: Option<Instant>,
+}
+fn seed() -> i64 {
+    std::env::var("HORIZON_BACKDROP_SEED")
+        .ok()
+        .and_then(|s| s.parse().ok())
+        .unwrap_or(SEED)
+}
+impl Game<'_> {
+    /// How visible the live backdrop is (0 until its first chunks are drawn).
+    pub(super) fn backdrop_fade(&self) -> f32 {
+        let Some(at) = self.backdrop.ready else {
+            return 0.0;
+        };
+        let x = (at.elapsed().as_secs_f32() / 1.6).clamp(0.0, 1.0);
+        x * x * (3.0 - 2.0 * x)
+    }
+    /// Whether the frame should draw the backdrop world instead of the panorama.
+    pub(super) fn backdrop_live(&self) -> bool {
+        self.title.is_some() && self.backdrop.active && self.backdrop.camera.is_some()
+    }
+    /// The orbiting camera: position, yaw and pitch.
+    pub(super) fn backdrop_view(&self) -> Option<(glam::DVec3, f32, f32)> {
+        let c = self.backdrop.camera?;
+        let t = self
+            .backdrop
+            .started
+            .map_or(0.0, |s| s.elapsed().as_secs_f32());
+        // A full turn in about six minutes.
+        let yaw = (200.0 + t * 1.0) % 360.0;
+        let pitch = 6.0 + (t * 0.05).sin() * 2.0;
+        Some((c, yaw, pitch))
+    }
+    /// Called every frame while the title is up.
+    pub(super) fn update_backdrop(&mut self) -> Result<()> {
+        let wanted = self.title.is_some()
+            && horizon_client::ui_theme::horizon()
+            && self.renderer.is_some()
+            && self.options.frames.is_none();
+        if !wanted {
+            if self.backdrop.active && self.title.is_some() {
+                self.stop_backdrop();
+            }
+            if self.title.is_none() && self.backdrop.active {
+                // open_world / connect_server replaced the world and streaming.
+                self.backdrop = Backdrop::default();
+            }
+            return Ok(());
+        }
+        if !self.backdrop.active {
+            self.start_backdrop()?;
+        }
+        let found = *self.backdrop.spot.lock().unwrap_or_else(|e| e.into_inner());
+        let Some(Some((x, z))) = found else {
+            return Ok(());
+        };
+        if !self.backdrop.centred {
+            self.backdrop.centred = true;
+            self.streaming.center = (x >> 4, z >> 4);
+            self.streaming.paused = false;
+        }
+        self.update_world();
+        if self.backdrop.camera.is_none()
+            && (-2..=2)
+                .all(|dz| (-2..=2).all(|dx| self.streaming.is_lit((x >> 4) + dx, (z >> 4) + dz)))
+        {
+            // Above the tallest block nearby, so no spike pokes through the lens.
+            let mut top = 64;
+            for dz in (-12..=12).step_by(3) {
+                for dx in (-12..=12).step_by(3) {
+                    if let Some(y) = self.surface_y(x + dx, z + dz) {
+                        top = top.max(y);
+                    }
+                }
+            }
+            let ground = self.surface_y(x, z).unwrap_or(top);
+            let y = (ground + 22).max(top + 4);
+            self.backdrop.camera = Some(glam::DVec3::new(
+                f64::from(x) + 0.5,
+                f64::from(y),
+                f64::from(z) + 0.5,
+            ));
+        }
+        if self.backdrop.camera.is_some()
+            && self.backdrop.ready.is_none()
+            && self
+                .renderer
+                .as_ref()
+                .is_some_and(|r| r.section_count() > 40)
+        {
+            self.backdrop.ready = Some(Instant::now());
+        }
+        Ok(())
+    }
+    /// The world tick of the backdrop: time passes for clouds and snow only.
+    pub(super) fn tick_backdrop(&mut self) {
+        if self.backdrop.active {
+            self.world.game_time += 1;
+            // The snow's fall follows the client tick counter.
+            self.ticks += 1;
+        }
+    }
+    fn surface_y(&self, x: i32, z: i32) -> Option<i32> {
+        let air = self.res.facts.air;
+        (-60..320).rev().find(|&y| self.world.block(x, y, z) != air)
+    }
+    fn start_backdrop(&mut self) -> Result<()> {
+        let seed = seed();
+        let root = std::env::current_dir()?
+            .join("saves")
+            .join(".horizon-title")
+            .join("backdrop");
+        std::fs::create_dir_all(&root)?;
+        let save = Arc::new(SaveDir::new(root.join(format!("{seed}"))));
+        let res = &*self.res;
+        let inner = Arc::new(
+            VanillaTerrain::new(
+                &self.options.resources.join("worldgen"),
+                res.assets.registry,
+                &res.biomes,
+                seed,
+            )
+            .map_err(|e| format!("title backdrop: {e}"))?,
+        );
+        let mut streaming = Streaming::new(
+            Arc::new(Persistent {
+                inner: inner.clone(),
+                save: save.clone(),
+                registry: res.assets.clone(),
+                biomes: res.biomes.clone(),
+            }),
+            res.context.clone(),
+            res.threads.min(6),
+        );
+        streaming.radius = self.settings.render_distance.clamp(4, 10);
+        streaming.biome_blend = self.settings.biome_blend;
+        streaming.smooth_lighting = self.settings.smooth_lighting;
+        streaming.cutout_leaves = self.settings.cutout_leaves;
+        streaming.biome_zoom = BiomeZoom::new(obfuscate_seed(seed));
+        streaming.paused = true;
+        self.streaming = streaming;
+        self.save = save;
+        let mut world = World::new(self.res.facts.air, seed);
+        world.day_time = DAY_TIME;
+        world.game_time = 6000;
+        // Light snow: the weather renders as snow in frozen biomes.
+        world.weather = Weather {
+            clear_time: 0,
+            rain_time: i32::MAX / 2,
+            thunder_time: i32::MAX / 2,
+            raining: true,
+            thundering: false,
+            rain_level: (0.35, 0.35),
+            thunder_level: (0.0, 0.0),
+        };
+        self.world = world;
+        self.dim = super::Dim::Overworld;
+        if let Some(r) = self.renderer.as_mut() {
+            r.clear_sections();
+        }
+        self.backdrop = Backdrop {
+            active: true,
+            started: Some(Instant::now()),
+            ..Default::default()
+        };
+        // Find (or recall) the spot off the main thread.
+        let spot = self.backdrop.spot.clone();
+        std::fs::create_dir_all(root.join(format!("{seed}")))?;
+        let cache = root.join(format!("{seed}")).join("spot.txt");
+        std::thread::Builder::new()
+            .name("horizon-backdrop".into())
+            .spawn(move || {
+                let known = std::fs::read_to_string(&cache).ok().and_then(|t| {
+                    let mut it = t.split_whitespace().map(|v| v.parse::<i32>().ok());
+                    Some((it.next()??, it.next()??))
+                });
+                let found = known.or_else(|| {
+                    let allowed = |name: &str| name == BIOME;
+                    let search = horizon_world::worldgen::generator::BiomeSearch {
+                        allowed: &allowed,
+                        origin: [0, 64, 0],
+                        radius: 6400,
+                        horizontal: 32,
+                        vertical: 64,
+                        min_y: -64,
+                        max_y: 320,
+                    };
+                    let found = inner.find_closest_biome(&search);
+                    eprintln!("Horizon: title backdrop: {BIOME} at {found:?}");
+                    let (_, p) = found?;
+                    let _ = std::fs::write(&cache, format!("{} {}\n", p[0], p[2]));
+                    Some((p[0], p[2]))
+                });
+                *spot.lock().unwrap_or_else(|e| e.into_inner()) =
+                    Some(Some(found.unwrap_or((0, 0))));
+            })?;
+        Ok(())
+    }
+    fn stop_backdrop(&mut self) {
+        self.streaming.paused = true;
+        self.world = World::new(self.res.facts.air, 0);
+        if let Some(r) = self.renderer.as_mut() {
+            r.clear_sections();
+        }
+        self.backdrop = Backdrop::default();
+    }
+}

crates/horizon-client/src/game/chat.rs

@@ -2,10 +2,11 @@
 //! (game rules, the world clock, difficulty), bound to the game.
 use super::{Dim, Game, Screen};
 use horizon_client::{
-    chat::{Chat, ChatScreen, SYSTEM_INDICATOR},
+    chat::{Chat, ChatAction, ChatScreen, Commands, SYSTEM_INDICATOR},
     command::{Registries, vanilla},
     gamerules::GameRules,
     hud::{HudBatch, rgba},
+    screen_draw::Measure,
     text::Text,
 };
 use std::collections::BTreeMap;
@@ -63,6 +64,8 @@ impl TimeMarker {
 pub struct UiState {
     pub chat: Chat,
     pub chat_screen: Option<ChatScreen>,
+    /// When the chat screen opened (its input took the focus: the cursor blink).
+    pub chat_opened: Option<std::time::Instant>,
     pub registries: Registries,
     pub rules: GameRules,
     pub clock: WorldClock,
@@ -368,9 +371,22 @@ impl Game<'_> {
             .as_ref()
             .map_or([1280, 720], |r| [r.config.width, r.config.height]);
         let b = HudBatch::new(size);
-        let mut screen = ChatScreen::new(initial, self.ui.chat.recent.len(), b.width, b.height);
-        screen.auto_suggestions = true;
+        let m = Measure(&self.res.atlas.font);
+        let c = Commands {
+            dispatcher: vanilla::game_dispatcher(),
+            registries: &self.ui.registries,
+        };
+        let mut screen = ChatScreen::new(
+            &m,
+            &c,
+            initial,
+            self.ui.chat.recent.len(),
+            b.width as i32,
+            b.height as i32,
+        );
+        screen.auto_suggestions = self.settings.auto_suggestions;
         self.ui.chat_screen = Some(screen);
+        self.ui.chat_opened = Some(std::time::Instant::now());
         self.screen = Screen::Chat;
         self.keys.clear();
         self.left = false;
@@ -409,67 +425,68 @@ impl Game<'_> {
     }
     /// A key (and the text it typed) while the chat screen is open.
     pub(super) fn chat_key_code(&mut self, key: KeyCode, typed_text: Option<&str>) {
-        let ctrl =
-            self.keys.contains(&KeyCode::ControlLeft) || self.keys.contains(&KeyCode::ControlRight);
+        // InputQuirks.EDIT_SHORTCUT_KEY_MODIFIER: Cmd on macOS, Ctrl elsewhere.
+        let (left, right) = if cfg!(target_os = "macos") {
+            (KeyCode::SuperLeft, KeyCode::SuperRight)
+        } else {
+            (KeyCode::ControlLeft, KeyCode::ControlRight)
+        };
+        let ctrl = self.keys.contains(&left) || self.keys.contains(&right);
         let shift =
             self.keys.contains(&KeyCode::ShiftLeft) || self.keys.contains(&KeyCode::ShiftRight);
+        match key {
+            // ChatScreen.keyPressed: the chat scrolls a page.
+            KeyCode::PageUp | KeyCode::PageDown
+                if !self
+                    .ui
+                    .chat_screen
+                    .as_ref()
+                    .is_some_and(|s| s.suggestions_visible()) =>
+            {
+                let n = self.ui.chat.lines_per_page(true) as i32 - 1;
+                self.ui
+                    .chat
+                    .scroll_by(if key == KeyCode::PageUp { n } else { -n }, true);
+                return;
+            }
+            _ => {}
+        }
         let Some(mut screen) = self.ui.chat_screen.take() else {
             return;
         };
-        let atlas = &self.res.atlas;
-        let d = vanilla::game_dispatcher();
-        if screen.suggestion_key(atlas, d, &self.ui.registries, key, shift) {
-            self.ui.chat_screen = Some(screen);
-            return;
-        }
-        let mut close = false;
-        let mut submit = None;
-        match key {
-            KeyCode::Escape => close = true,
-            KeyCode::Enter | KeyCode::NumpadEnter => {
-                submit = Some(screen.normalized());
-                close = true;
-            }
-            KeyCode::ArrowUp => screen.move_in_history(&self.ui.chat.recent, -1),
-            KeyCode::ArrowDown => screen.move_in_history(&self.ui.chat.recent, 1),
-            KeyCode::PageUp => {
-                let n = self.ui.chat.lines_per_page(true) as i32 - 1;
-                self.ui.chat.scroll_by(n, true);
-            }
-            KeyCode::PageDown => {
-                let n = self.ui.chat.lines_per_page(true) as i32 - 1;
-                self.ui.chat.scroll_by(-n, true);
-            }
-            _ => {
-                if screen.input.key(key, ctrl, shift) {
-                    screen.edited();
-                } else if let Some(text) = typed_text
-                    && !ctrl
-                {
-                    let typed: String = text.chars().filter(|c| !c.is_control()).collect();
-                    if !typed.is_empty() {
-                        screen.input.insert_text(&typed);
-                        screen.edited();
-                    }
+        let m = Measure(&self.res.atlas.font);
+        let c = Commands {
+            dispatcher: vanilla::game_dispatcher(),
+            registries: &self.ui.registries,
+        };
+        match screen.key(&m, &c, &self.ui.chat.recent, key, shift, ctrl) {
+            ChatAction::Close => self.close_chat(),
+            ChatAction::Submit(message) => {
+                self.close_chat();
+                if !message.is_empty() {
+                    self.handle_chat_input(&message);
                 }
             }
-        }
-        if close {
-            self.close_chat();
-        } else {
-            self.ui.chat_screen = Some(screen);
-        }
-        if let Some(message) = submit
-            && !message.is_empty()
-        {
-            self.handle_chat_input(&message);
+            ChatAction::None => {
+                // charTyped: the text the key typed.
+                if let Some(text) = typed_text
+                    && !ctrl
+                {
+                    screen.type_text(&m, &c, text);
+                }
+                self.ui.chat_screen = Some(screen);
+            }
         }
     }
     /// Text typed into the chat box (control socket `chat`).
     pub(super) fn chat_type(&mut self, text: &str) {
+        let m = Measure(&self.res.atlas.font);
+        let c = Commands {
+            dispatcher: vanilla::game_dispatcher(),
+            registries: &self.ui.registries,
+        };
         if let Some(screen) = self.ui.chat_screen.as_mut() {
-            screen.input.insert_text(text);
-            screen.edited();
+            screen.type_text(&m, &c, text);
         }
     }
     /// ChatScreen.handleChatInput: history, then a command or a chat line.
@@ -494,8 +511,10 @@ impl Game<'_> {
         let height = self.renderer.as_ref().map_or(720.0, |r| {
             HudBatch::new([r.config.width, r.config.height]).height
         });
+        let _ = height;
+        let mouse = (cursor.0.floor() as i32, cursor.1.floor() as i32);
         if let Some(screen) = self.ui.chat_screen.as_mut()
-            && screen.scroll_suggestions(cursor, height, amount)
+            && screen.scroll(mouse, amount as f64)
         {
             return;
         }
@@ -508,12 +527,14 @@ impl Game<'_> {
         let height = self.renderer.as_ref().map_or(720.0, |r| {
             HudBatch::new([r.config.width, r.config.height]).height
         });
-        if let Some(screen) = self.ui.chat_screen.as_mut()
-            && !screen.click(cursor, height)
-            && screen.input.y <= cursor.1
-        {
-            let i = screen.input.index_at(&self.res.atlas, cursor.0);
-            screen.input.set_cursor(i, false);
+        let _ = height;
+        let m = Measure(&self.res.atlas.font);
+        let c = Commands {
+            dispatcher: vanilla::game_dispatcher(),
+            registries: &self.ui.registries,
+        };
+        if let Some(screen) = self.ui.chat_screen.as_mut() {
+            screen.click(&m, &c, cursor.0 as f64, cursor.1 as f64);
         }
     }
     /// Chat lines over the HUD (focused while the chat screen is open).
@@ -530,16 +551,25 @@ impl Game<'_> {
         let Some(mut screen) = self.ui.chat_screen.take() else {
             return;
         };
-        screen.resize(batch.width, batch.height);
-        let bg = self.ui.chat.options.background_opacity as f32;
-        screen.draw(
-            batch,
-            &self.res.atlas,
-            vanilla::game_dispatcher(),
-            &self.ui.registries,
-            self.cursor,
-            bg,
-        );
+        let m = Measure(&self.res.atlas.font);
+        let c = Commands {
+            dispatcher: vanilla::game_dispatcher(),
+            registries: &self.ui.registries,
+        };
+        screen.resize(&m, &c, batch.width as i32, batch.height as i32);
+        // Options.getBackgroundColor(Integer.MIN_VALUE).
+        let background = if self.settings.file.bool("backgroundForChatOnly") {
+            i32::MIN
+        } else {
+            self.settings.text_background(0.0) as i32
+        };
+        let mouse = (self.cursor.0.floor() as i32, self.cursor.1.floor() as i32);
+        let blink = self
+            .ui
+            .chat_opened
+            .map_or(0, |t| t.elapsed().as_millis() as u64);
+        let draws = screen.draw(&m, mouse, blink, background);
+        horizon_client::screen_draw::paint(batch, &self.res.atlas, &draws);
         self.ui.chat_screen = Some(screen);
     }
     /// Advance the overworld clock (ServerClockManager.tick) when

crates/horizon-client/src/game/commands.rs

@@ -140,7 +140,7 @@ impl Game<'_> {
         if self.command_source.is_some_and(|s| s.silent) {
             return;
         }
-        self.system_message(message.with_color(text::RED));
+        self.system_message(Text::empty().append(message).with_color(text::RED));
     }
     /// sendSuccess honouring `send_command_feedback`.
     pub(super) fn feedback(&mut self, message: Text) {

crates/horizon-client/src/game/control.rs

@@ -299,7 +299,7 @@ impl Game<'_> {
                 }
                 match self.screen {
                     Screen::Chat => self.chat_type(text),
-                    Screen::Options => self.ui.options.type_text(text),
+                    Screen::Options => self.ui.options.type_text(&self.res.atlas, text),
                     Screen::Inventory if self.recipe_search_focused() => {
                         self.recipe_text(Some(text), false)
                     }

crates/horizon-client/src/game/copper_golems.rs

@@ -1,177 +1,151 @@
-//! Copper golems on the game side: `TransportItemsBetweenContainers` (carry
-//! items from copper chests to ordinary chests), weathering and turning into
-//! statues, and the hand-over, waxing, scraping and shearing interactions.
+//! Copper golems on the game side: what their brain (`mobs::transport_items`)
+//! does to chests (opener counts, the lid block events, slots), the openers
+//! recheck, turning into statues, and the hand-over, waxing, scraping and
+//! shearing interactions.
 use super::Game;
 use horizon_client::{
-    containers::BlockEntity,
     items::ItemStack,
-    mobs::{Mob, Species, copper_golem as cg, goals::should_panic},
+    mobs::{
+        Mob, Species,
+        transport_items::{held, set_held},
+    },
 };
 use horizon_core::random::RandomSource;
 use horizon_world::chunk::BlockState;
 
-type Key = (i32, i32, i32);
-/// `TransportItemState`.
-const TRAVELLING: i32 = 0;
-const QUEUING: i32 = 1;
-const INTERACTING: i32 = 2;
-/// `ContainerInteractionState` (0 = none).
-const PICKUP_ITEM: i32 = 1;
-const PICKUP_NO_ITEM: i32 = 2;
-const PLACE_ITEM: i32 = 3;
-const PLACE_NO_ITEM: i32 = 4;
-/// Positions that were unreachable are kept in `positions` with this offset.
-const UNREACHABLE: i32 = 1 << 20;
-/// `TransportItemsBetweenContainers.VISITED_POSITIONS_MEMORY_TIME`.
-const MEMORY_TICKS: i32 = 6000;
-
-/// Whether a block is a copper chest (the pick-up sources).
-pub(super) fn is_copper_chest(name: &str) -> bool {
-    name.ends_with("copper_chest")
-}
-/// The held stack (`getMainHandItem`).
-pub(super) fn held(m: &Mob) -> Option<&ItemStack> {
-    m.extra.items.first().and_then(Option::as_ref)
-}
-/// `setItemInHand(MAIN_HAND, ..)`, keeping the rendered copy in step.
-pub(super) fn set_held(m: &mut Mob, stack: Option<ItemStack>) {
-    let stack = stack.filter(|s| s.count > 0);
-    m.extra.main_hand = stack.as_ref().map(|s| s.item.clone());
-    m.extra.ints[1] = stack.as_ref().map_or(0, |s| s.count as i32);
-    if m.extra.items.is_empty() {
-        m.extra.items.push(None);
-    }
-    m.extra.items[0] = stack;
-}
-fn visited(m: &Mob) -> Vec<[i32; 3]> {
-    m.extra
-        .positions
-        .iter()
-        .filter(|p| p[1] < UNREACHABLE)
-        .copied()
-        .collect()
-}
-fn blocked_list(m: &Mob) -> impl Iterator<Item = [i32; 3]> + '_ {
-    m.extra.positions.iter().map(|p| {
-        if p[1] >= UNREACHABLE {
-            [p[0], p[1] - UNREACHABLE, p[2]]
-        } else {
-            *p
-        }
-    })
-}
-fn chest_center(h: [i32; 3]) -> [f64; 3] {
-    [
-        f64::from(h[0]) + 0.5,
-        f64::from(h[1]) + 0.5,
-        f64::from(h[2]) + 0.5,
-    ]
-}
-/// The copper golem state the model, sounds and animations follow.
-fn set_state(m: &mut Mob, state: u8) {
-    m.extra.variant3 = state;
-}
+/// `ContainerOpenersCounter.CHECK_TICK_DELAY`.
+const RECHECK_TICKS: i64 = 5;
 
 impl Game<'_> {
-    pub(super) fn tick_copper_golems(&mut self) {
-        let ids: Vec<u32> = self
-            .mobs
-            .iter()
-            .filter(|m| m.species() == Species::CopperGolem && m.alive() && !m.removed)
-            .map(|m| m.id)
-            .collect();
-        for id in ids {
-            let Some(i) = self.mobs.iter().position(|m| m.id == id) else {
+    /// A copper golem opened or closed a chest half: the counter changes and
+    /// the clients see the block event (`openerCountChanged`).
+    pub(super) fn golem_chest_open(&mut self, chest: [i32; 3], open: bool) {
+        let key = (chest[0], chest[1], chest[2]);
+        let entry = self.world.chest_openers.entry(key).or_insert((0, 0.0));
+        if open {
+            entry.0 += 1;
+            entry.1 = entry.1.max(3.0);
+        } else {
+            entry.0 -= 1;
+            if entry.0 == 0 {
+                entry.1 = 0.0;
+            }
+        }
+        let count = entry.0;
+        if count <= 0 {
+            self.world.chest_openers.remove(&key);
+        }
+        self.block_entity_event(chest, 1, count.max(0));
+    }
+    /// A copper golem took from or filled a chest slot.
+    pub(super) fn golem_chest_slot(
+        &mut self,
+        chest: [i32; 3],
+        slot: usize,
+        stack: Option<ItemStack>,
+    ) {
+        if let Some(e) = self
+            .world
+            .block_entities
+            .get_mut(&(chest[0], chest[1], chest[2]))
+            && let Some(s) = e.slots_mut().get_mut(slot)
+        {
+            *s = stack;
+        }
+    }
+    /// `ContainerOpenersCounter.recheckOpeners` every five ticks: the golems
+    /// whose opened chest is this one, within its range plus 4; when none
+    /// is left the chest closes (a double chest the golem left open).
+    pub(super) fn recheck_golem_openers(&mut self) {
+        if self.world.game_time % RECHECK_TICKS != 0 {
+            return;
+        }
+        let open: Vec<(i32, i32, i32)> = self.world.chest_openers.keys().copied().collect();
+        for key in open {
+            let p = [key.0, key.1, key.2];
+            let other = self.chest_other_half(key).map(|o| [o.0, o.1, o.2]);
+            let range = self.world.chest_openers.get(&key).map_or(0.0, |o| o.1) + 4.0;
+            let area = horizon_core::geometry::Aabb::new(
+                horizon_core::geometry::Vec3::new(
+                    f64::from(p[0]) - range,
+                    f64::from(p[1]) - range,
+                    f64::from(p[2]) - range,
+                ),
+                horizon_core::geometry::Vec3::new(
+                    f64::from(p[0]) + 1.0 + range,
+                    f64::from(p[1]) + 1.0 + range,
+                    f64::from(p[2]) + 1.0 + range,
+                ),
+            );
+            let count = self
+                .mobs
+                .iter()
+                .filter(|m| {
+                    m.species() == Species::CopperGolem
+                        && !m.removed
+                        && m.extra
+                            .opened_chest
+                            .is_some_and(|o| o == p || Some(o) == other)
+                        && m.bounds().intersects(area)
+                })
+                .count() as i32;
+            let before = self.world.chest_openers.get(&key).map_or(0, |o| o.0);
+            if count == before {
                 continue;
-            };
-            let mut m = self.mobs[i].clone();
-            self.copper_golem_step(&mut m);
-            if let Some(i) = self.mobs.iter().position(|x| x.id == id) {
-                self.mobs[i] = m;
             }
-        }
-        let alive: std::collections::HashSet<u32> = self.mobs.iter().map(|m| m.id).collect();
-        self.golem_openers.retain(|id, _| alive.contains(id));
-    }
-    fn copper_golem_step(&mut self, m: &mut Mob) {
-        if self.golem_weathering(m) {
-            return;
-        }
-        // CountDownCooldownTicks(TRANSPORT_ITEMS_COOLDOWN_TICKS).
-        if m.extra.scratch[3] > 0 {
-            m.extra.scratch[3] -= 1;
-        }
-        // The visited positions fade after 6000 ticks.
-        if m.extra.ints[2] > 0 && m.age as i32 >= m.extra.ints[2] {
-            m.extra.positions.clear();
-            m.extra.ints[2] = 0;
-        }
-        let running = m.extra.scratch[3] <= 0 && !should_panic(m) && m.extra.leash.is_none();
-        if !running {
-            if m.extra.home.is_some() || m.extra.scratch[0] != TRAVELLING {
-                self.golem_on_start_travelling(m);
-                m.extra.point = None;
-                m.ai.nav.stop();
+            if count == 0 {
+                self.world.chest_openers.remove(&key);
+                self.golem_chest_sound(p, false);
+            } else if let Some(o) = self.world.chest_openers.get_mut(&key) {
+                o.0 = count;
             }
-            return;
-        }
-        let invalid = self.golem_update_invalid_target(m);
-        if m.extra.home.is_none() {
-            self.golem_on_start_travelling(m);
-            return;
-        }
-        if invalid {
-            return;
-        }
-        if m.extra.scratch[0] == QUEUING {
-            self.golem_on_queuing(m);
-        }
-        if m.extra.scratch[0] == TRAVELLING {
-            self.golem_on_travel(m);
-        }
-        if m.extra.scratch[0] == INTERACTING {
-            self.golem_on_reached(m);
+            self.block_entity_event(p, 1, count);
         }
     }
-    // ---- weathering -------------------------------------------------------
-    /// `CopperGolem.updateWeathering`; true when it turned into a statue.
-    fn golem_weathering(&mut self, m: &mut Mob) -> bool {
-        let now = self.world.game_time;
-        let next = m.extra.vector[0] as i64;
-        if next == -2 {
-            return false;
-        }
-        // updateWeathering draws from the level random.
-        let r = &mut self.world.random;
-        let mut interval = || 504_000 + i64::from(r.next_int_bound(48_001).unwrap_or(0));
-        if next == -1 {
-            m.extra.vector[0] = (now + interval()) as f64;
-            return false;
-        }
-        let fully = m.extra.variant >= 3;
-        if now >= next && !fully {
-            let new = cg::weather_next(m.extra.variant);
-            m.extra.variant = new;
-            m.extra.vector[0] = if new >= 3 {
-                0.0
-            } else {
-                (next + interval()) as f64
-            };
-        }
-        if fully && self.golem_can_turn_to_statue(m) {
-            self.golem_turn_to_statue(m);
-            return true;
-        }
-        false
-    }
-    fn golem_can_turn_to_statue(&mut self, m: &mut Mob) -> bool {
-        let p = [
-            m.position.x.floor() as i32,
-            m.position.y.floor() as i32,
-            m.position.z.floor() as i32,
+    /// `ChestBlockEntity.playSound` for a chest the recheck closed.
+    fn golem_chest_sound(&mut self, p: [i32; 3], open: bool) {
+        let name = self
+            .res
+            .facts
+            .get(self.world.block(p[0], p[1], p[2]))
+            .name
+            .clone();
+        let base = name
+            .trim_start_matches("minecraft:")
+            .trim_start_matches("waxed_");
+        let kind = if !base.ends_with("copper_chest") {
+            "chest"
+        } else if base.starts_with("weathered") {
+            "copper_chest_weathered"
+        } else if base.starts_with("oxidized") {
+            "copper_chest_oxidized"
+        } else {
+            "copper_chest"
+        };
+        let side = if open { "open" } else { "close" };
+        let at = [
+            f64::from(p[0]) + 0.5,
+            f64::from(p[1]) + 0.5,
+            f64::from(p[2]) + 0.5,
         ];
-        let at = self.world.block(p[0], p[1], p[2]);
-        self.res.facts.is_air(at) && self.world.random.next_float() <= 0.0058
+        let pitch = self.world.random.next_float() * 0.1 + 0.9;
+        self.audio.play(
+            &format!("minecraft:block.{kind}.{side}"),
+            Some(at),
+            0.5,
+            pitch,
+        );
+    }
+    /// `CopperGolem.turnToStatue`, which its weathering asked for.
+    pub(super) fn golem_become_statue(&mut self, id: u32) {
+        let Some(i) = self.mobs.iter().position(|m| m.id == id) else {
+            return;
+        };
+        let mut m = self.mobs[i].clone();
+        self.golem_turn_to_statue(&mut m);
+        if let Some(i) = self.mobs.iter().position(|x| x.id == id) {
+            self.mobs[i] = m;
+        }
     }
     fn golem_turn_to_statue(&mut self, m: &mut Mob) {
         let pos = [
@@ -202,7 +176,7 @@ impl Game<'_> {
             return;
         }
         self.golem_drop_equipment(m);
-        self.golem_release(m);
+        m.extra.opened_chest = None;
         if m.extra.leash.is_some() {
             self.break_leash(m.id, true, false);
             m.extra.leash = None;
@@ -229,450 +203,6 @@ impl Game<'_> {
             self.spawn_at_location(at, 0.0, antenna);
         }
     }
-    // ---- containers -------------------------------------------------------
-    /// The block entities of the container at a chest, in slot order.
-    fn golem_container(&self, key: Key) -> Vec<Key> {
-        let Some(other) = self.chest_other_half(key) else {
-            return vec![key];
-        };
-        let right = self
-            .res
-            .assets
-            .registry
-            .state(self.world.block(key.0, key.1, key.2))
-            .and_then(|s| s.properties.get("type"))
-            .is_some_and(|t| t == "right");
-        if right {
-            vec![key, other]
-        } else {
-            vec![other, key]
-        }
-    }
-    fn golem_block_name(&self, key: Key) -> std::sync::Arc<str> {
-        self.res
-            .facts
-            .get(self.world.block(key.0, key.1, key.2))
-            .name
-            .clone()
-    }
-    fn golem_chest_blocked(&self, keys: &[Key]) -> bool {
-        keys.iter().any(|k| {
-            let above = self.world.block(k.0, k.1 + 1, k.2);
-            self.res.behaviours.facts(above).flags
-                & horizon_world::level::data::state_flags::CONDUCTOR
-                != 0
-        })
-    }
-    fn golem_slots(&self, keys: &[Key]) -> Vec<Option<ItemStack>> {
-        keys.iter()
-            .filter_map(|k| self.world.block_entities.get(k))
-            .flat_map(|e| e.slots().to_vec())
-            .collect()
-    }
-    fn golem_slot_mut(&mut self, keys: &[Key], mut n: usize) -> Option<&mut Option<ItemStack>> {
-        for k in keys {
-            let len = self.world.block_entities.get(k)?.slots().len();
-            if n < len {
-                return self.world.block_entities.get_mut(k)?.slots_mut().get_mut(n);
-            }
-            n -= len;
-        }
-        None
-    }
-    fn golem_max_stack(&self, stack: &ItemStack) -> u32 {
-        self.res
-            .items
-            .get(&stack.item)
-            .map_or(64, |i| i.max_stack)
-            .max(1)
-    }
-    /// `pickupItemFromContainer`: up to 16 of the first non-empty slot.
-    fn golem_pick_up(&mut self, keys: &[Key]) -> Option<ItemStack> {
-        let slots = self.golem_slots(keys);
-        let (n, stack) = slots
-            .iter()
-            .enumerate()
-            .find_map(|(n, s)| s.as_ref().map(|s| (n, s.clone())))?;
-        let take = stack.count.min(16);
-        let slot = self.golem_slot_mut(keys, n)?;
-        let mut out = stack;
-        out.count = take;
-        match slot {
-            Some(s) if s.count > take => s.count -= take,
-            _ => *slot = None,
-        }
-        Some(out)
-    }
-    /// `addItemsToContainer`: the part that did not fit.
-    fn golem_put_down(&mut self, keys: &[Key], mut stack: ItemStack) -> Option<ItemStack> {
-        let max = self.golem_max_stack(&stack);
-        let slots = self.golem_slots(keys);
-        for (n, existing) in slots.iter().enumerate() {
-            match existing {
-                None => {
-                    if let Some(slot) = self.golem_slot_mut(keys, n) {
-                        *slot = Some(stack);
-                    }
-                    return None;
-                }
-                Some(e)
-                    if e.item == stack.item
-                        && e.damage == stack.damage
-                        && e.extra == stack.extra
-                        && e.count < max =>
-                {
-                    let room = max - e.count;
-                    let add = room.min(stack.count);
-                    if let Some(Some(s)) = self.golem_slot_mut(keys, n) {
-                        s.count += add;
-                    }
-                    // Vanilla subtracts the whole room, which empties the stack
-                    // when it fitted.
-                    stack.count = stack.count.saturating_sub(room);
-                    if stack.count == 0 {
-                        return None;
-                    }
-                }
-                _ => {}
-            }
-        }
-        Some(stack)
-    }
-    /// Whether any other golem or a player has the chest open.
-    fn golem_chest_busy(&self, m: &Mob, keys: &[Key]) -> bool {
-        self.golem_openers
-            .iter()
-            .any(|(id, k)| *id != m.id && keys.contains(k))
-            || self.container.is_some_and(|c| keys.contains(&c))
-    }
-    // ---- the behaviour ----------------------------------------------------
-    fn golem_wanted_block(&self, m: &Mob, key: Key) -> bool {
-        let name = self.golem_block_name(key);
-        if held(m).is_none() {
-            is_copper_chest(&name)
-        } else {
-            matches!(&*name, "minecraft:chest" | "minecraft:trapped_chest")
-        }
-    }
-    fn golem_update_invalid_target(&mut self, m: &mut Mob) -> bool {
-        if self.golem_has_valid_target(m) {
-            return false;
-        }
-        self.golem_stop_targeting(m);
-        match self.golem_find_target(m) {
-            Some(t) => {
-                m.extra.home = Some([t.0, t.1, t.2]);
-                self.golem_on_start_travelling(m);
-                self.golem_set_visited(m, [t.0, t.1, t.2]);
-            }
-            None => self.golem_enter_cooldown(m),
-        }
-        true
-    }
-    fn golem_has_valid_target(&mut self, m: &mut Mob) -> bool {
-        let Some(h) = m.extra.home else { return false };
-        let key = (h[0], h[1], h[2]);
-        let valid = self.golem_wanted_block(m, key)
-            && matches!(
-                self.world.block_entities.get(&key),
-                Some(BlockEntity::Chest(_))
-            )
-            && !self.golem_chest_blocked(&self.golem_container(key));
-        if !valid {
-            return false;
-        }
-        if m.extra.scratch[0] != TRAVELLING {
-            return true;
-        }
-        if self.golem_valid_travelling_path(m, h) {
-            return true;
-        }
-        self.golem_mark_unreachable(m, h);
-        false
-    }
-    /// `hasValidTravellingPath`, without the line-of-sight clip.
-    fn golem_valid_travelling_path(&mut self, m: &mut Mob, h: [i32; 3]) -> bool {
-        let w = self.mob_world_base(&[]);
-        let path = match &m.ai.nav.path {
-            Some(p) => Some(p.clone()),
-            None => m.create_path_to(&w, h, 0),
-        };
-        let from = match path.as_ref().and_then(|p| p.end()) {
-            Some(n) => [
-                f64::from(n.x) + 0.5,
-                f64::from(n.y) + m.kind.height / 2.0,
-                f64::from(n.z) + 0.5,
-            ],
-            None => [
-                m.position.x,
-                m.position.y + m.kind.height / 2.0,
-                m.position.z,
-            ],
-        };
-        let reach = golem_within(m, self.golem_range(m), from, h);
-        (path.is_none() && !reach) || reach
-    }
-    fn golem_range(&self, m: &Mob) -> f64 {
-        if m.ai.nav.path.as_ref().is_some_and(|p| p.is_done()) {
-            1.0
-        } else {
-            0.5
-        }
-    }
-    fn golem_find_target(&self, m: &Mob) -> Option<Key> {
-        let bx = m.position.x.floor() as i32;
-        let by = m.position.y.floor() as i32;
-        let bz = m.position.z.floor() as i32;
-        let skip: Vec<[i32; 3]> = blocked_list(m).collect();
-        let mut best: Option<(f64, Key)> = None;
-        for (key, entity) in &self.world.block_entities {
-            if !matches!(entity, BlockEntity::Chest(_)) {
-                continue;
-            }
-            if (key.0 - bx).abs() > 32 || (key.1 - by).abs() > 8 || (key.2 - bz).abs() > 32 {
-                continue;
-            }
-            let center = chest_center([key.0, key.1, key.2]);
-            let d = (center[0] - m.position.x).powi(2)
-                + (center[1] - m.position.y).powi(2)
-                + (center[2] - m.position.z).powi(2);
-            if best.is_some_and(|(b, _)| d >= b) {
-                continue;
-            }
-            if !self.golem_wanted_block(m, *key) {
-                continue;
-            }
-            let keys = self.golem_container(*key);
-            if keys.iter().any(|k| skip.contains(&[k.0, k.1, k.2])) {
-                continue;
-            }
-            if self.golem_chest_blocked(&keys) {
-                continue;
-            }
-            best = Some((d, *key));
-        }
-        best.map(|b| b.1)
-    }
-    fn golem_set_visited(&mut self, m: &mut Mob, h: [i32; 3]) {
-        let mut list = visited(m);
-        if !list.contains(&h) {
-            list.push(h);
-        }
-        if list.len() > 10 {
-            self.golem_enter_cooldown(m);
-            return;
-        }
-        m.extra.positions.retain(|p| p[1] >= UNREACHABLE);
-        m.extra.positions.extend(list);
-        m.extra.ints[2] = m.age as i32 + MEMORY_TICKS;
-    }
-    fn golem_mark_unreachable(&mut self, m: &mut Mob, h: [i32; 3]) {
-        m.extra.positions.retain(|p| *p != h);
-        let marked = [h[0], h[1] + UNREACHABLE, h[2]];
-        if !m.extra.positions.contains(&marked) {
-            m.extra.positions.push(marked);
-        }
-        let count = m
-            .extra
-            .positions
-            .iter()
-            .filter(|p| p[1] >= UNREACHABLE)
-            .count();
-        if count > 50 {
-            self.golem_enter_cooldown(m);
-        } else {
-            m.extra.ints[2] = m.age as i32 + MEMORY_TICKS;
-        }
-    }
-    fn golem_stop_targeting(&mut self, m: &mut Mob) {
-        m.extra.scratch[1] = 0;
-        m.extra.home = None;
-        m.extra.point = None;
-        m.ai.nav.stop();
-    }
-    fn golem_clear_memories(&mut self, m: &mut Mob) {
-        self.golem_stop_targeting(m);
-        m.extra.positions.clear();
-    }
-    fn golem_enter_cooldown(&mut self, m: &mut Mob) {
-        self.golem_stop_targeting(m);
-        m.extra.scratch[3] = 140;
-        m.extra.positions.clear();
-    }
-    /// `onStartTravelling` and the golem's own consumer.
-    fn golem_on_start_travelling(&mut self, m: &mut Mob) {
-        self.golem_release(m);
-        set_state(m, cg::IDLE);
-        m.extra.scratch[0] = TRAVELLING;
-        m.extra.scratch[2] = 0;
-        m.extra.scratch[1] = 0;
-    }
-    /// `clearOpenedChestPos` (and so `stopOpen` at the next recheck).
-    fn golem_release(&mut self, m: &Mob) {
-        if let Some(key) = self.golem_openers.remove(&m.id) {
-            let keys = self.golem_container(key);
-            if !self.golem_chest_busy(m, &keys) {
-                self.golem_chest_sound(key, false);
-            }
-        }
-    }
-    fn golem_chest_sound(&mut self, key: Key, open: bool) {
-        let name = self.golem_block_name(key);
-        let base = name
-            .trim_start_matches("minecraft:")
-            .trim_start_matches("waxed_");
-        let kind = if base.starts_with("weathered") {
-            "copper_chest_weathered"
-        } else if base.starts_with("oxidized") {
-            "copper_chest_oxidized"
-        } else if base.ends_with("copper_chest") {
-            "copper_chest"
-        } else {
-            "chest"
-        };
-        let side = if open { "open" } else { "close" };
-        let at = chest_center([key.0, key.1, key.2]);
-        let pitch = self.world.random.next_float() * 0.1 + 0.9;
-        self.audio.play(
-            &format!("minecraft:block.{kind}.{side}"),
-            Some(at),
-            0.5,
-            pitch,
-        );
-    }
-    fn golem_on_queuing(&mut self, m: &mut Mob) {
-        let Some(h) = m.extra.home else { return };
-        let keys = self.golem_container((h[0], h[1], h[2]));
-        if !self.golem_chest_busy(m, &keys) {
-            m.extra.scratch[0] = TRAVELLING;
-            m.extra.point = Some(chest_center(h));
-        }
-    }
-    fn golem_on_travel(&mut self, m: &mut Mob) {
-        let Some(h) = m.extra.home else { return };
-        let key = (h[0], h[1], h[2]);
-        let keys = self.golem_container(key);
-        let center = [
-            m.position.x,
-            m.position.y + m.kind.height / 2.0,
-            m.position.z,
-        ];
-        if golem_within(m, 3.0, center, h) && self.golem_chest_busy(m, &keys) {
-            // startQueuing.
-            m.extra.point = None;
-            m.ai.nav.stop();
-            m.extra.scratch[0] = QUEUING;
-        } else if golem_within(m, self.golem_range(m), center, h) {
-            // startOnReachedTargetInteraction.
-            let slots = self.golem_slots(&keys);
-            let state = if held(m).is_none() {
-                if slots.iter().any(Option::is_some) {
-                    PICKUP_ITEM
-                } else {
-                    PICKUP_NO_ITEM
-                }
-            } else if slots.iter().all(Option::is_none)
-                || slots
-                    .iter()
-                    .flatten()
-                    .any(|s| held(m).is_some_and(|h| h.item == s.item))
-            {
-                PLACE_ITEM
-            } else {
-                PLACE_NO_ITEM
-            };
-            m.extra.scratch[2] = state;
-            m.extra.scratch[0] = INTERACTING;
-        } else {
-            m.extra.point = Some(chest_center(h));
-        }
-    }
-    fn golem_on_reached(&mut self, m: &mut Mob) {
-        let Some(h) = m.extra.home else { return };
-        let key = (h[0], h[1], h[2]);
-        let center = [
-            m.position.x,
-            m.position.y + m.kind.height / 2.0,
-            m.position.z,
-        ];
-        if !golem_within(m, 2.0, center, h) {
-            self.golem_on_start_travelling(m);
-            return;
-        }
-        m.extra.scratch[1] += 1;
-        let ticks = m.extra.scratch[1];
-        // onTargetInteraction: stand still, and the reached interaction.
-        m.extra.point = None;
-        m.ai.nav.stop();
-        let (state, sound) = match m.extra.scratch[2] {
-            PICKUP_ITEM => (cg::GETTING_ITEM, Some("entity.copper_golem.no_item_get")),
-            PICKUP_NO_ITEM => (
-                cg::GETTING_NO_ITEM,
-                Some("entity.copper_golem.no_item_no_get"),
-            ),
-            PLACE_ITEM => (cg::DROPPING_ITEM, Some("entity.copper_golem.item_drop")),
-            PLACE_NO_ITEM => (
-                cg::DROPPING_NO_ITEM,
-                Some("entity.copper_golem.item_no_drop"),
-            ),
-            _ => (cg::IDLE, None),
-        };
-        if m.extra.scratch[2] != 0 {
-            if ticks == 1 {
-                let keys = self.golem_container(key);
-                if !self.golem_chest_busy(m, &keys) {
-                    self.golem_chest_sound(key, true);
-                }
-                self.golem_openers.insert(m.id, key);
-                set_state(m, state);
-            }
-            if ticks == 9
-                && let Some(sound) = sound
-            {
-                let at = [m.position.x, m.position.y, m.position.z];
-                self.audio
-                    .play(&format!("minecraft:{sound}"), Some(at), 1.0, 1.0);
-            }
-            if ticks == 60 {
-                self.golem_release(m);
-            }
-        }
-        if ticks >= 60 {
-            let keys = self.golem_container(key);
-            if held(m).is_none() {
-                if self.golem_slots(&keys).iter().any(Option::is_some) {
-                    // pickUpItems.
-                    let stack = self.golem_pick_up(&keys);
-                    set_held(m, stack);
-                    self.golem_clear_memories(m);
-                } else {
-                    self.golem_stop_targeting(m);
-                }
-            } else if self.golem_slots(&keys).iter().all(Option::is_none)
-                || self
-                    .golem_slots(&keys)
-                    .iter()
-                    .flatten()
-                    .any(|s| held(m).is_some_and(|h| h.item == s.item))
-            {
-                // putDownItem.
-                let stack = held(m)
-                    .cloned()
-                    .unwrap_or_else(|| ItemStack::new("minecraft:air", 0));
-                let left = self.golem_put_down(&keys, stack);
-                let emptied = left.is_none();
-                set_held(m, left);
-                if emptied {
-                    self.golem_clear_memories(m);
-                } else {
-                    self.golem_stop_targeting(m);
-                }
-            } else {
-                self.golem_stop_targeting(m);
-            }
-            self.golem_on_start_travelling(m);
-        }
-    }
     // ---- interactions -----------------------------------------------------
     /// `CopperGolem.mobInteract`; true when handled.
     pub(super) fn interact_copper_golem(&mut self, index: usize, item: &str) -> bool {
@@ -743,7 +273,7 @@ impl Game<'_> {
         if is_axe && self.mobs[index].extra.variant > 0 {
             let m = &mut self.mobs[index];
             m.extra.vector[0] = -1.0;
-            m.extra.variant = cg::weather_previous(m.extra.variant);
+            m.extra.variant = horizon_client::mobs::copper_golem::weather_previous(m.extra.variant);
             self.audio
                 .play("minecraft:item.axe.scrape", Some(at), 1.0, 1.0);
             self.damage_held_tool();
@@ -762,25 +292,3 @@ impl Game<'_> {
         })
     }
 }
-/// `isWithinTargetDistance`: the golem's box centred on `from` against the
-/// chest's collision box inflated by `distance` (and half a block vertically).
-fn golem_within(m: &Mob, distance: f64, from: [f64; 3], h: [i32; 3]) -> bool {
-    let hw = m.kind.width / 2.0;
-    let hh = m.kind.height / 2.0;
-    let lo = [
-        f64::from(h[0]) + 0.0625 - distance,
-        f64::from(h[1]) - 0.5,
-        f64::from(h[2]) + 0.0625 - distance,
-    ];
-    let hi = [
-        f64::from(h[0]) + 0.9375 + distance,
-        f64::from(h[1]) + 0.875 + 0.5,
-        f64::from(h[2]) + 0.9375 + distance,
-    ];
-    from[0] + hw > lo[0]
-        && from[0] - hw < hi[0]
-        && from[1] + hh > lo[1]
-        && from[1] - hh < hi[1]
-        && from[2] + hw > lo[2]
-        && from[2] - hw < hi[2]
-}

crates/horizon-client/src/game/creatures.rs

@@ -328,6 +328,7 @@ impl Game<'_> {
             world_seed: self.level.seed,
             sea_level: if self.dim == Dim::Nether { 32 } else { 63 },
             teams: self.mob_teams(),
+            items: Some(&self.res.items),
             difficulty: self.local_difficulty(
                 self.player
                     .as_ref()
@@ -761,6 +762,11 @@ impl Game<'_> {
                         }
                     }
                 },
+                MobEvent::ChestOpen { chest, open } => self.golem_chest_open(chest, open),
+                MobEvent::ChestSlot { chest, slot, stack } => {
+                    self.golem_chest_slot(chest, slot, stack)
+                }
+                MobEvent::BecomeStatue { mob } => self.golem_become_statue(mob),
                 MobEvent::Gift { target, item } => {
                     if let Some(m) = self.mobs.iter_mut().find(|m| m.id == target)
                         && m.saddle_item().is_none()

crates/horizon-client/src/game/lan_actions.rs

@@ -544,14 +544,14 @@ impl Game<'_> {
                 .take()
                 .unwrap_or_default()
                 .iter()
-                .map(horizon_client::text::Text::plain)
-                .collect::<Vec<String>>()
+                .map(|t| horizon_client::lan::data::component_nbt(&t.component()))
+                .collect::<Vec<_>>()
         });
-        for line in lines.unwrap_or_default() {
+        for content in lines.unwrap_or_default() {
             host.hub.send_to(
                 conn,
                 &C::SystemChat(play::SystemChat {
-                    content: literal(&line),
+                    content,
                     overlay: false,
                 }),
             );

crates/horizon-client/src/game/options.rs

@@ -77,12 +77,12 @@ impl Game<'_> {
     }
     pub(super) fn options_key(&mut self, key: KeyCode, text: Option<&str>) -> Result<()> {
         let mut ui = std::mem::take(&mut self.ui.options);
-        let events = ui.key(&mut self.settings, key, text);
+        let events = ui.key(&mut self.settings, &self.res.atlas, key, text);
         self.ui.options = ui;
         self.handle_option_events(events)
     }
     pub(super) fn options_scroll(&mut self, amount: f32) {
-        self.ui.options.scroll(amount);
+        self.ui.options.scroll_at(self.cursor, amount);
     }
     /// Mouse buttons pressed while a key is being bound.
     pub(super) fn options_waiting_for_key(&self) -> bool {

crates/horizon-client/src/game/packs.rs

@@ -5,9 +5,9 @@ use super::Game;
 use horizon_client::{
     hud::HudAtlas,
     lang,
-    options_ui::PackEntry,
-    packs::{self, Pack},
-    text::Text,
+    pack_screen::{Compat, PackInfo, Source as PackSource},
+    packs::{self, Pack, Position},
+    text::{Style, Text},
 };
 use std::path::{Path, PathBuf};
 
@@ -28,22 +28,38 @@ pub fn startup_root(vanilla: &Path, selected: &[String]) -> PathBuf {
     let enabled = packs::enabled(&all, selected);
     packs::resource_root(vanilla, &enabled, &cache_dir())
 }
-fn entry(p: &Pack) -> PackEntry {
-    PackEntry {
+fn info(p: &Pack) -> PackInfo {
+    let built_in = !p.id.starts_with("file/");
+    PackInfo {
         id: p.id.clone(),
         title: p.title.clone(),
-        description: p.description.clone(),
-        compatible: p.compatible,
+        description: p.raw_description.clone(),
+        description_style: p.description_style.clone(),
+        source: if built_in {
+            PackSource::BuiltIn
+        } else {
+            PackSource::Default
+        },
+        compat: p.compatibility,
+        icon: p.icon,
         required: false,
+        position: Position::Top,
+        fixed: false,
     }
 }
-fn vanilla_entry() -> PackEntry {
-    PackEntry {
+/// The vanilla pack: required, at the bottom (`BuiltInPackSource`).
+fn vanilla_info() -> PackInfo {
+    PackInfo {
         id: "vanilla".into(),
         title: Text::translate("resourcePack.vanilla.name", &[]),
         description: Text::translate("resourcePack.vanilla.description", &[]),
-        compatible: true,
+        description_style: Style::default(),
+        source: PackSource::BuiltIn,
+        compat: Compat::Compatible,
+        icon: true,
         required: true,
+        position: Position::Bottom,
+        fixed: false,
     }
 }
 impl Game<'_> {
@@ -54,31 +70,16 @@ impl Game<'_> {
             self.ui.vanilla_root.clone()
         }
     }
-    /// PackSelectionModel: available (unselected) and selected (top first).
+    /// The packs the pack screen offers and the current selection
+    /// (`PackSelectionScreen` makes its `PackSelectionModel` from them).
     pub(super) fn refresh_pack_lists(&mut self) {
         let all = packs::discover(&self.vanilla_root(), &packs_dir());
-        let selected_ids = &self.settings.resource_packs;
-        let mut selected: Vec<PackEntry> = selected_ids
-            .iter()
-            .rev()
-            .filter_map(|id| {
-                if id == "vanilla" {
-                    Some(vanilla_entry())
-                } else {
-                    all.iter().find(|p| &p.id == id).map(entry)
-                }
-            })
-            .collect();
-        if !selected.iter().any(|p| p.id == "vanilla") {
-            selected.push(vanilla_entry());
-        }
-        let available = all
-            .iter()
-            .filter(|p| !selected_ids.contains(&p.id))
-            .map(entry)
-            .collect();
-        self.ui.options.available = available;
-        self.ui.options.selected = selected;
+        let mut infos: Vec<PackInfo> = all.iter().map(info).collect();
+        infos.push(vanilla_info());
+        let o = &mut self.ui.options;
+        o.pack_infos = infos;
+        o.pack_selection = self.settings.resource_packs.clone();
+        o.pack_screen = None;
     }
     /// Rebuild the overlay and reload what can change while running.
     pub(super) fn reload_packs(&mut self) {

crates/horizon-client/src/game/recipe_book.rs

@@ -10,7 +10,7 @@ use horizon_client::{
     hud::{HudBatch, Rect, rgba},
     items::ItemStack,
     menu::place::{PostPlace, Stacked},
-    recipe_book::{Book, BookType, ClientBook, Collection, Display, Entry, Tab},
+    recipe_book::{Book, BookType, ClientBook, Collection, Entry, GhostTarget, Tab},
     recipe_book_screen::{
         self as screen, ButtonView, Call, Drawn, GhostView, ItemCall, OverlayRecipe, OverlayView,
         Screen as Layout, Search, TabView,
@@ -423,7 +423,11 @@ impl Game<'_> {
             }
             if !query.is_empty()
                 && !book.collection_matches(&c.entries, &query, &|stack| {
-                    self.stack_tooltip(stack).into_iter().map(|l| l.0).collect()
+                    horizon_client::item_tooltip::lines(
+                        stack,
+                        self.res.items.get(&stack.item),
+                        &|k| self.res.names.get(k).map(str::to_owned),
+                    )
                 })
             {
                 continue;
@@ -712,68 +716,26 @@ impl Game<'_> {
 
     /// `fillGhostRecipe`: the recipe's ingredients faded into the slots.
     fn fill_ghost(&mut self, book_type: BookType, entry: &Entry) {
+        let grid = self.craft_size;
+        let fuel_empty = self.slot_mut(301).is_none();
         let Some(book) = self.recipe_ui.book.as_ref() else {
             return;
         };
-        let stacks = |ingredient: &horizon_client::crafting::Ingredient| -> Vec<ItemStack> {
-            book.items_of(ingredient)
-                .iter()
-                .map(|i| ItemStack::new(i, 1))
-                .collect()
-        };
-        let mut ghost = Vec::new();
-        match book_type {
-            BookType::Crafting => {
-                let (gw, gh) = (self.craft_size, self.craft_size);
-                ghost.push(Ghost {
-                    slot: 200,
-                    items: vec![entry.result.clone()],
-                    result: true,
-                });
-                let requirements = entry.requirements();
-                for (ingredient, grid_index) in entry.grid_cells(gw, gh) {
-                    if let Some(i) = ingredient {
-                        let items = stacks(requirements[i]);
-                        if !items.is_empty() {
-                            ghost.push(Ghost {
-                                slot: 100 + grid_index,
-                                items,
-                                result: false,
-                            });
-                        }
-                    }
-                }
-            }
-            _ => {
-                ghost.push(Ghost {
-                    slot: 302,
-                    items: vec![entry.result.clone()],
-                    result: true,
-                });
-                if let Display::Furnace(ingredient) = &entry.display {
-                    ghost.push(Ghost {
-                        slot: 300,
-                        items: stacks(ingredient),
-                        result: false,
-                    });
-                    if self.slot_mut(301).is_none() {
-                        let mut fuels: Vec<&std::sync::Arc<str>> = self
-                            .res
-                            .items
-                            .order
-                            .iter()
-                            .filter(|i| self.res.items.get(i).is_some_and(|i| i.fuel.is_some()))
-                            .collect();
-                        fuels.dedup();
-                        ghost.push(Ghost {
-                            slot: 301,
-                            items: fuels.iter().map(|i| ItemStack::new(i, 1)).collect(),
-                            result: false,
-                        });
-                    }
-                }
-            }
-        }
+        let ghost = book
+            .ghost(entry, book_type, grid, fuel_empty, &self.res.items)
+            .into_iter()
+            .map(|g| Ghost {
+                slot: match (g.target, book_type) {
+                    (GhostTarget::Result, BookType::Crafting) => 200,
+                    (GhostTarget::Result, _) => 302,
+                    (GhostTarget::Grid(i), _) => 100 + i,
+                    (GhostTarget::Input, _) => 300,
+                    (GhostTarget::Fuel, _) => 301,
+                },
+                result: g.target == GhostTarget::Result,
+                items: g.items,
+            })
+            .collect();
         self.recipe_ui.ghost = ghost;
     }
 

crates/horizon-client/src/game/remote.rs

@@ -105,6 +105,8 @@ pub(super) struct Remote {
     /// `ClientPacketListener.playerInfoMap` as player-list entries, and
     /// which of them are listed.
     tab_players: HashMap<u128, horizon_client::tab_list::TabPlayer>,
+    /// Each listed profile's unpacked `textures` property.
+    skin_textures: HashMap<u128, horizon_client::skins::Textures>,
     listed: std::collections::HashSet<u128>,
     /// `ClientboundLoginPacket.onlineMode`: the player list shows heads.
     online_mode: bool,
@@ -234,6 +236,7 @@ impl Game<'_> {
             action_bar: None,
             players: HashMap::new(),
             tab_players: HashMap::new(),
+            skin_textures: HashMap::new(),
             listed: Default::default(),
             online_mode: false,
             level_players: HashMap::new(),
@@ -1120,6 +1123,21 @@ impl Game<'_> {
                                 r.tab_players.entry(e.uuid).or_insert_with(|| {
                                     horizon_client::tab_list::TabPlayer::new(e.uuid, name.clone())
                                 });
+                                if let Some(t) = e.properties.iter().find(|p| p.name == "textures")
+                                {
+                                    // Without the services' profile property keys a
+                                    // signature can't be checked; a signed property
+                                    // counts as genuine.
+                                    use horizon_client::skins::{self, Signature};
+                                    let signature = if t.signature.is_some() {
+                                        Signature::Signed
+                                    } else {
+                                        Signature::Unsigned
+                                    };
+                                    let textures =
+                                        skins::unpack(&t.value, signature, &skins::TEXTURE_URIS);
+                                    r.skin_textures.entry(e.uuid).or_insert(textures);
+                                }
                             }
                         }
                     }
@@ -1162,6 +1180,7 @@ impl Game<'_> {
                     for u in p.uuids {
                         r.players.remove(&u);
                         r.tab_players.remove(&u);
+                        r.skin_textures.remove(&u);
                         r.listed.remove(&u);
                     }
                 }
@@ -1327,17 +1346,41 @@ impl Game<'_> {
             _ => {}
         }
     }
-    /// The player list's view of the connection: the listed players, online
-    /// mode, and which players are in the level with an upside-down name.
+    /// The player list's view of the connection: the listed players (with
+    /// their downloaded skins once ready), online mode, and which players
+    /// are in the level with an upside-down name.
     pub(super) fn remote_tab_players(
-        &self,
+        &mut self,
     ) -> Option<(Vec<horizon_client::tab_list::TabPlayer>, bool, Vec<u128>)> {
         let r = self.remote.as_ref()?;
-        let players: Vec<_> = r
+        let mut players: Vec<_> = r
             .listed
             .iter()
             .filter_map(|u| r.tab_players.get(u).cloned())
             .collect();
+        for p in &mut players {
+            let Some(textures) = r.skin_textures.get(&p.uuid) else {
+                continue;
+            };
+            // PlayerInfo.createSkinLookup: only the local player's own skin
+            // may be unsigned.
+            let downloads = &mut self.skin_downloads;
+            let skin = horizon_client::skins::lookup(textures, p.uuid != r.profile, |kind, url| {
+                downloads.state(kind, url)
+            });
+            if let Some(skin) = skin {
+                p.skin = skin;
+            }
+        }
+        for (location, rgba) in self.skin_downloads.take_ready() {
+            self.store_skin(location, rgba);
+        }
+        for p in &mut players {
+            if p.skin.starts_with("skins/") && !self.show_skin(&p.skin) {
+                p.skin = horizon_client::tab_list::default_skin(p.uuid).to_owned();
+            }
+        }
+        let r = self.remote.as_ref()?;
         let upside_down = players
             .iter()
             .filter(|p| {
@@ -1348,6 +1391,46 @@ impl Game<'_> {
             .collect();
         Some((players, r.online_mode, upside_down))
     }
+    /// Puts a downloaded skin in an atlas skin slot: a free one, else the
+    /// least recently shown.
+    fn store_skin(&mut self, location: String, rgba: Vec<u8>) {
+        use horizon_client::hud::SKIN_SLOTS;
+        let slot = if self.skin_slots.len() < SKIN_SLOTS {
+            self.skin_slots.len()
+        } else {
+            let (old, slot) = self.skin_slots.remove(0);
+            self.res.atlas.sprites.remove(&old);
+            slot
+        };
+        let Some(rect) = self
+            .res
+            .atlas
+            .sprites
+            .get(&format!("horizon/skin{slot}"))
+            .copied()
+        else {
+            return;
+        };
+        let (w, h) = (self.res.atlas.width as f32, self.res.atlas.height as f32);
+        self.map_patches.push(horizon_client::font::Patch {
+            x: (rect.u0 * w).round() as u32,
+            y: (rect.v0 * h).round() as u32,
+            width: 64,
+            height: 64,
+            rgba,
+        });
+        self.res.atlas.sprites.insert(location.clone(), rect);
+        self.skin_slots.push((location, slot));
+    }
+    /// Whether a downloaded skin is in the atlas, marking it recently shown.
+    fn show_skin(&mut self, location: &str) -> bool {
+        let Some(i) = self.skin_slots.iter().position(|e| e.0 == location) else {
+            return false;
+        };
+        let e = self.skin_slots.remove(i);
+        self.skin_slots.push(e);
+        true
+    }
     /// ChatType decoration: `chat.translation_key` with sender/content parameters.
     fn format_chat(&self, bound: &play::ChatTypeBound, content: &str) -> String {
         let Some(r) = self.remote.as_ref() else {

crates/horizon-client/src/game/screens.rs

@@ -52,7 +52,32 @@ fn death_buttons(w: f32, h: f32) -> [(f32, f32, &'static str, u8); 2] {
     ]
 }
 impl Game<'_> {
+    /// Whether the pause menu is drawn in Horizon's style (over a blurred world).
+    pub(super) fn horizon_pause(&self) -> bool {
+        self.screen == Screen::Paused && self.title.is_none() && horizon_client::ui_theme::horizon()
+    }
+    fn pause_labels(&self) -> (String, &'static str) {
+        let world = if self.remote.is_some() {
+            "Multiplayer".to_owned()
+        } else {
+            self.level.name.clone()
+        };
+        let quit = if self.remote.is_some() {
+            "Disconnect"
+        } else {
+            "Save and quit"
+        };
+        (world, quit)
+    }
     pub(super) fn draw_pause_menu(&mut self, batch: &mut HudBatch) {
+        if horizon_client::ui_theme::horizon() {
+            let opened = *self.pause_since.get_or_insert_with(std::time::Instant::now);
+            let (world, quit) = self.pause_labels();
+            let mut ui = horizon_client::ui_theme::Ui::new(&self.res.atlas, batch, self.cursor);
+            horizon_client::front::pause::draw(&mut ui, &world, quit, opened);
+            ui.finish();
+            return;
+        }
         let atlas = &self.res.atlas;
         let (w, h) = (batch.width, batch.height);
         ui::menu_background(batch, atlas, 0.0, 0.0, w, h, true);
@@ -102,10 +127,27 @@ impl Game<'_> {
             let b = HudBatch::new(size);
             (b.width, b.height)
         };
-        let hit = pause_buttons(w, h)
-            .into_iter()
-            .find(|b| b.5 && ui::hovered(self.cursor, b.0, b.1, b.2, 20.0))
-            .map(|b| b.4);
+        let hit = if horizon_client::ui_theme::horizon() {
+            let size = self
+                .renderer
+                .as_ref()
+                .map_or([1, 1], |r| [r.config.width, r.config.height]);
+            let mut b = HudBatch::new(size);
+            let (world, quit) = self.pause_labels();
+            horizon_client::front::pause::click(
+                &self.res.atlas,
+                &mut b,
+                self.cursor.0,
+                self.cursor.1,
+                &world,
+                quit,
+            )
+        } else {
+            pause_buttons(w, h)
+                .into_iter()
+                .find(|b| b.5 && ui::hovered(self.cursor, b.0, b.1, b.2, 20.0))
+                .map(|b| b.4)
+        };
         match hit {
             Some(0) => {
                 self.screen = Screen::Playing;

crates/horizon-client/src/gfx.rs

@@ -96,6 +96,8 @@ pub struct Frame<'a> {
     pub night_vision: f32,
     /// Torch flicker added to the block light factor of 1.4.
     pub block_flicker: f32,
+    /// Blur and grade the frame under a Horizon-style menu (`post`).
+    pub post: Option<crate::post::PostGrade>,
 }
 /// One frame of the world border wall (`WorldBorderRenderer.render`).
 #[derive(Clone, Debug)]
@@ -162,6 +164,8 @@ pub struct Renderer {
     reachable_from: Option<SectionKey>,
     visibility_dirty: bool,
     pub hud: HudRenderer,
+    /// The menus' backdrop blur, made on first use.
+    post: Option<crate::post::Post>,
     pub info: wgpu::AdapterInfo,
     pub suspended: bool,
     pub drawn_sections: usize,
@@ -1086,6 +1090,7 @@ impl Renderer {
             reachable_from: None,
             visibility_dirty: true,
             hud,
+            post: None,
             info,
             suspended: size.width == 0 || size.height == 0,
             drawn_sections: 0,
@@ -1853,6 +1858,23 @@ impl Renderer {
                 pass.draw_indexed(0..6, (i * 4) as i32, 0..1);
             }
         }
+        if let Some(grade) = &frame.post
+            && self.config.usage.contains(wgpu::TextureUsages::COPY_SRC)
+        {
+            let format = self.config.format;
+            let device = &self.device;
+            self.post
+                .get_or_insert_with(|| crate::post::Post::new(device, format))
+                .apply(
+                    &self.device,
+                    &self.queue,
+                    &mut encoder,
+                    &surface_frame.texture,
+                    &view_target,
+                    [self.config.width, self.config.height],
+                    grade,
+                );
+        }
         self.hud.draw(
             &self.device,
             &self.queue,

crates/horizon-client/src/hotbar.rs

@@ -0,0 +1,121 @@
+//! The creative mode toolbars of `hotbar.nbt` (`HotbarManager`,
+//! `Hotbar`): nine saved rows of nine stacks, read through the `HOTBAR`
+//! data fixers when the file is from an older version.
+use crate::{items::ItemStack, save};
+use horizon_world::nbt::{JavaString, Tag};
+use std::path::Path;
+
+/// `HotbarManager.NUM_HOTBAR_GROUPS`.
+pub const GROUPS: usize = 9;
+/// `Inventory.getSelectionSize`: the stacks of one saved row.
+pub const SIZE: usize = 9;
+
+/// One saved toolbar row.
+pub type Hotbar = Vec<Option<ItemStack>>;
+
+fn empty() -> Hotbar {
+    vec![None; SIZE]
+}
+
+/// `Hotbar.CODEC` and `Hotbar.load` on the row's tag: a row of fewer than nine
+/// entries is lost, a longer one is cut (`Util.fixedSize` returns the first
+/// nine as a partial result), an entry that is not a stack is empty.
+fn row(tag: Option<&Tag>, known: &dyn Fn(&str) -> bool) -> Hotbar {
+    let Some(Tag::List(items)) = tag else {
+        return empty();
+    };
+    if items.len() < SIZE {
+        return empty();
+    }
+    items.iter().take(SIZE).map(|t| stack(t, known)).collect()
+}
+
+/// `ItemStack.OPTIONAL_CODEC` of a saved stack: the count is lenient (1
+/// unless it is a number from 1 to 99), an item that is not registered is an
+/// error.
+fn stack(tag: &Tag, known: &dyn Fn(&str) -> bool) -> Option<ItemStack> {
+    let stack = save::item_from_nbt(tag)?;
+    if !known(&stack.item) {
+        return None;
+    }
+    let count = match tag.get("count") {
+        Some(Tag::Byte(n)) => i32::from(*n),
+        Some(Tag::Short(n)) => i32::from(*n),
+        Some(Tag::Int(n)) => *n,
+        _ => 1,
+    };
+    Some(ItemStack {
+        count: if (1..=99).contains(&count) {
+            count as u32
+        } else {
+            1
+        },
+        ..stack
+    })
+}
+
+/// `HotbarManager.load` on the file's tag.
+pub fn from_tag(mut tag: Tag, known: &dyn Fn(&str) -> bool) -> Vec<Hotbar> {
+    let version = match tag.get("DataVersion") {
+        Some(Tag::Int(v)) => *v,
+        _ => 1343,
+    };
+    // Until the last fixer that rewrites item stacks (`UnfilledBuriedTreasureMapFix`,
+    // 5016) the fixers read each row as a list of stacks: an entry that is
+    // none is dropped from its row (a bare item id is a stack from 3818.5 on)
+    // and a row that is no list ends the reading. After that fixer nothing
+    // reads the rows and bare ids are no stacks.
+    const LAST_STACK_FIXER: i32 = 5016;
+    if version < horizon_world::DATA_VERSION
+        && let Tag::Compound(rows) = &mut tag
+    {
+        if version < LAST_STACK_FIXER {
+            // A row that is no list stops the traversal there: it and the
+            // rows after it (in key order) are lost.
+            let broken = (0..GROUPS).find(|i| {
+                rows.get(&JavaString::from(i.to_string().as_str()))
+                    .is_some_and(|r| {
+                        !matches!(
+                            r,
+                            Tag::List(_) | Tag::ByteArray(_) | Tag::IntArray(_) | Tag::LongArray(_)
+                        )
+                    })
+            });
+            if let Some(broken) = broken {
+                for i in broken..GROUPS {
+                    rows.remove(&JavaString::from(i.to_string().as_str()));
+                }
+            }
+            // Entries that are no stacks are dropped from their row.
+            for row in rows.values_mut() {
+                if let Tag::List(items) = row {
+                    items.retain(|i| {
+                        matches!(i, Tag::Compound(_))
+                            || (version > 3818 && matches!(i, Tag::String(_)))
+                    });
+                }
+            }
+        } else {
+            for row in rows.values_mut() {
+                if let Tag::List(items) = row {
+                    for item in items.iter_mut().filter(|i| matches!(i, Tag::String(_))) {
+                        *item = Tag::Compound(Default::default());
+                    }
+                }
+            }
+        }
+    }
+    horizon_world::datafix::update_hotbar(&mut tag);
+    (0..GROUPS)
+        .map(|i| row(tag.get(&i.to_string()), known))
+        .collect()
+}
+
+/// `HotbarManager.load` of the `hotbar.nbt` at `path`: every row empty when
+/// the file is missing or unreadable.
+pub fn load(path: &Path, known: &dyn Fn(&str) -> bool) -> Vec<Hotbar> {
+    match save::read_dat(path) {
+        Some(tag @ Tag::Compound(_)) => from_tag(tag, known),
+        _ => (0..GROUPS).map(|_| empty()).collect(),
+    }
+}

crates/horizon-client/src/hud.rs

@@ -31,8 +31,14 @@ pub struct HudAtlas {
 pub const GLYPH_ROWS: u32 = 512;
 /// 128x128 atlas slots for map textures.
 pub const MAP_SLOTS: usize = 16;
+/// Atlas slots for downloaded player skins (`skins/<sha1>`), 64x64 each.
+pub const SKIN_SLOTS: usize = 32;
 pub fn decode(path: &Path) -> Result<(u32, u32, Vec<u8>)> {
-    let mut decoder = png::Decoder::new(std::io::BufReader::new(fs::File::open(path)?));
+    decode_bytes(&fs::read(path)?)
+}
+/// A PNG in memory as RGBA pixels.
+pub fn decode_bytes(data: &[u8]) -> Result<(u32, u32, Vec<u8>)> {
+    let mut decoder = png::Decoder::new(std::io::Cursor::new(data));
     decoder.set_transformations(png::Transformations::EXPAND | png::Transformations::STRIP_16);
     let mut reader = decoder.read_info()?;
     let mut bytes = vec![0; reader.output_buffer_size().ok_or("image too large")?];
@@ -194,6 +200,17 @@ impl HudAtlas {
         for i in 0..MAP_SLOTS {
             images.push((format!("horizon/map{i}"), 128, 128, vec![0; 128 * 128 * 4]));
         }
+        // Downloaded skins (game/scoreboard.rs) likewise.
+        for i in 0..SKIN_SLOTS {
+            images.push((format!("horizon/skin{i}"), 64, 64, vec![0; 64 * 64 * 4]));
+        }
+        // Horizon-style menu text and corner masks (ui_theme), rasterized at run time.
+        images.push((
+            "horizon/ui-text".into(),
+            2048,
+            1024,
+            vec![0; 2048 * 1024 * 4],
+        ));
         images.sort_by(|a, b| b.2.cmp(&a.2).then(b.1.cmp(&a.1)));
         let width = 4096u32;
         let mut placements = Vec::with_capacity(images.len());

crates/horizon-client/src/item_tooltip.rs

@@ -0,0 +1,297 @@
+//! The lines of an item's tooltip as `ItemStack.getTooltipLines` writes them
+//! without a player and without advanced tooltips, for stacks as recipes
+//! produce them. The recipe book's search tree matches them, so recipes of
+//! tools and armour answer to "attack speed" or "when on head".
+use crate::items::{ItemInfo, ItemStack};
+
+/// `EquipmentSlotGroup` in declaration order, the order tooltips list them in.
+const SLOT_GROUPS: [&str; 11] = [
+    "any", "mainhand", "offhand", "hand", "feet", "legs", "chest", "head", "armor", "body",
+    "saddle",
+];
+
+/// `ItemAttributeModifiers.ATTRIBUTE_MODIFIER_FORMAT`, `DecimalFormat("#.##")`
+/// of a positive amount (half-even on the exact value).
+fn format_amount(value: f64) -> String {
+    let text = format!("{:.2}", value);
+    text.trim_end_matches('0').trim_end_matches('.').to_owned()
+}
+
+/// `ItemAttributeModifiers.Display.Default.apply`: a modifier's line, none
+/// for a zero amount. `percent` is the modifier's operation id (0: added
+/// value, 1 and 2: multiplied).
+fn modifier_line(
+    translate: &dyn Fn(&str) -> Option<String>,
+    attribute: &str,
+    amount: f64,
+    operation: usize,
+) -> Option<String> {
+    let text = |key: &str| translate(key).unwrap_or_else(|| key.to_owned());
+    let scale = match operation {
+        0 if attribute == "knockback_resistance" => 10.0,
+        0 => 1.0,
+        _ => 100.0,
+    };
+    let (kind, shown) = if amount > 0.0 {
+        ("plus", amount * scale)
+    } else if amount < 0.0 {
+        ("take", -amount * scale)
+    } else {
+        return None;
+    };
+    Some(
+        text(&format!("attribute.modifier.{kind}.{operation}"))
+            .replacen("%s", &format_amount(shown), 1)
+            .replacen("%s", &text(&format!("attribute.name.{attribute}")), 1)
+            .replace("%%", "%"),
+    )
+}
+
+/// `ItemStack.addAttributeTooltips` for the item's own modifiers: per slot
+/// group an empty line, the group's heading and a line per modifier.
+fn attribute_lines(info: &ItemInfo, translate: &dyn Fn(&str) -> Option<String>) -> Vec<String> {
+    let mut lines = Vec::new();
+    for group in SLOT_GROUPS {
+        let mut first = true;
+        for (attribute, _, amount, operation, slot) in &info.modifiers {
+            if slot != group {
+                continue;
+            }
+            if std::mem::take(&mut first) {
+                lines.push(String::new());
+                lines.push(
+                    translate(&format!("item.modifiers.{group}"))
+                        .unwrap_or_else(|| format!("item.modifiers.{group}")),
+                );
+            }
+            let id = match operation.as_str() {
+                "add_multiplied_base" => 1,
+                "add_multiplied_total" => 2,
+                _ => 0,
+            };
+            let path = attribute.strip_prefix("minecraft:").unwrap_or(attribute);
+            lines.extend(modifier_line(translate, path, *amount, id));
+        }
+    }
+    lines
+}
+
+/// The attribute modifiers a mob effect adds per amplifier level
+/// (`MobEffects`): attribute, amount, operation id.
+fn effect_modifier(effect: &str) -> Option<(&'static str, f64, usize)> {
+    Some(match effect {
+        "speed" => ("movement_speed", 0.2, 2),
+        "slowness" => ("movement_speed", -0.15, 2),
+        "strength" => ("attack_damage", 3.0, 0),
+        "weakness" => ("attack_damage", -4.0, 0),
+        "jump_boost" => ("safe_fall_distance", 1.0, 0),
+        "luck" => ("luck", 1.0, 0),
+        "invisibility" => ("waypoint_transmit_range", -1.0, 2),
+        _ => return None,
+    })
+}
+
+fn is_potion_item(item: &str) -> bool {
+    item.ends_with("potion") || item == "minecraft:tipped_arrow"
+}
+
+/// The name line of `stack`, as the item's translation or, for potions and
+/// smithing templates, its name component gives it.
+pub fn name_line(stack: &ItemStack, translate: &dyn Fn(&str) -> Option<String>) -> String {
+    let path = stack.item.trim_start_matches("minecraft:");
+    if let Some(name) = stack.custom_name() {
+        return name.to_owned();
+    }
+    let key = if is_potion_item(&stack.item) {
+        Some(crate::brewing::potion_name_key(&stack.item, stack.potion()))
+    } else if let Some(pattern) = path.strip_suffix("_armor_trim_smithing_template") {
+        Some(format!("trim_pattern.minecraft.{pattern}"))
+    } else if path == "netherite_upgrade_smithing_template" {
+        Some("upgrade.minecraft.netherite_upgrade".to_owned())
+    } else if path.ends_with("_banner_pattern") {
+        // The item name component of the pattern items that have one.
+        Some(format!("item.minecraft.{path}.new"))
+    } else {
+        None
+    };
+    key.and_then(|k| translate(&k))
+        .or_else(|| translate(&format!("item.minecraft.{path}")))
+        .or_else(|| translate(&format!("block.minecraft.{path}")))
+        .unwrap_or_else(|| path.replace('_', " "))
+}
+
+/// The lines of `stack` below its name that its components give, in
+/// `ItemStack.addDetailsToTooltip` order.
+pub fn detail_lines(
+    stack: &ItemStack,
+    info: Option<&ItemInfo>,
+    translate: &dyn Fn(&str) -> Option<String>,
+) -> Vec<String> {
+    let text = |key: &str| translate(key).unwrap_or_else(|| key.to_owned());
+    let path = stack.item.trim_start_matches("minecraft:");
+    let mut lines = Vec::new();
+    // SmithingTemplateItem.appendHoverText.
+    if path.ends_with("_smithing_template") {
+        let kind = if path == "netherite_upgrade_smithing_template" {
+            "netherite_upgrade"
+        } else {
+            "armor_trim"
+        };
+        lines.push(text("item.minecraft.smithing_template"));
+        lines.push(String::new());
+        lines.push(text("item.minecraft.smithing_template.applies_to"));
+        lines.push(format!(
+            " {}",
+            text(&format!(
+                "item.minecraft.smithing_template.{kind}.applies_to"
+            ))
+        ));
+        lines.push(text("item.minecraft.smithing_template.ingredients"));
+        lines.push(format!(
+            " {}",
+            text(&format!(
+                "item.minecraft.smithing_template.{kind}.ingredients"
+            ))
+        ));
+    }
+    // BeehiveBlock: the block state components of the item.
+    if path == "beehive" {
+        lines.push(
+            text("container.beehive.bees")
+                .replacen("%s", "0", 1)
+                .replacen("%s", "3", 1),
+        );
+        lines.push(
+            text("container.beehive.honey")
+                .replacen("%s", "0", 1)
+                .replacen("%s", "5", 1),
+        );
+    }
+    let data = stack.data();
+    // FireworkRocketItem: the flight duration (an unset component is 1).
+    if path == "firework_rocket" {
+        let flight = data.and_then(|d| d.fireworks.as_ref()).map_or(1, |f| f.0);
+        lines.push(format!(
+            "{} {flight}",
+            text("item.minecraft.firework_rocket.flight")
+        ));
+    }
+    // PotDecorations.addToTooltip.
+    if let Some(sherds) = data
+        .and_then(|d| d.pot_decorations.as_ref())
+        .filter(|s| s.iter().any(Option::is_some))
+    {
+        lines.push(String::new());
+        for sherd in sherds.iter() {
+            let item = sherd.as_ref().map_or("minecraft:brick", |s| &*s.item);
+            lines.push(name_line(&ItemStack::new(item, 1), translate));
+        }
+    }
+    // PotionContents.addToTooltip: the effects, then their attribute modifiers.
+    if is_potion_item(&stack.item) {
+        let scale = match path {
+            "lingering_potion" => 0.25,
+            "tipped_arrow" => 0.125,
+            _ => 1.0,
+        };
+        lines.extend(
+            crate::brewing::tooltip(stack.potion(), scale, translate)
+                .into_iter()
+                .map(|l| l.0),
+        );
+        let applied: Vec<String> = stack
+            .potion()
+            .and_then(crate::brewing::potion)
+            .into_iter()
+            .flat_map(|p| p.effects.iter())
+            .filter_map(|(effect, _, amplifier)| {
+                let (attribute, amount, operation) = effect_modifier(effect)?;
+                modifier_line(
+                    translate,
+                    attribute,
+                    amount * (*amplifier + 1) as f64,
+                    operation,
+                )
+            })
+            .collect();
+        if !applied.is_empty() {
+            lines.push(String::new());
+            lines.push(text("potion.whenDrank"));
+            lines.extend(applied);
+        }
+    }
+    // JukeboxPlayable.addToTooltip: the song's description.
+    if path.starts_with("music_disc_") {
+        lines.push(text(&format!("item.minecraft.{path}.desc")));
+    }
+    // Trim.addToTooltip.
+    if let Some((material, pattern)) = data.and_then(|d| d.trim.as_ref()) {
+        let short = |s: &str| s.trim_start_matches("minecraft:").to_owned();
+        lines.push(text("item.minecraft.smithing_template.upgrade"));
+        lines.push(format!(
+            " {}",
+            text(&format!("trim_pattern.minecraft.{}", short(pattern)))
+        ));
+        lines.push(format!(
+            " {}",
+            text(&format!("trim_material.minecraft.{}", short(material)))
+        ));
+    }
+    // DyedItemColor.addToTooltip (without advanced tooltips).
+    if data.is_some_and(|d| d.dyed_color.is_some()) {
+        lines.push(text("item.dyed"));
+    }
+    if let Some(info) = info {
+        lines.extend(attribute_lines(info, translate));
+    }
+    lines
+}
+
+/// Every line of `stack`'s tooltip, name first.
+pub fn lines(
+    stack: &ItemStack,
+    info: Option<&ItemInfo>,
+    translate: &dyn Fn(&str) -> Option<String>,
+) -> Vec<String> {
+    let mut lines = vec![name_line(stack, translate)];
+    lines.extend(detail_lines(stack, info, translate));
+    lines
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn amounts_use_two_decimals_at_most() {
+        assert_eq!(format_amount(8.0), "8");
+        assert_eq!(format_amount(3.2000000953674316), "3.2");
+        assert_eq!(format_amount(2.8200000524520874), "2.82");
+        assert_eq!(format_amount(0.125), "0.12");
+        assert_eq!(format_amount(0.375), "0.38");
+    }
+
+    #[test]
+    fn modifier_lines_follow_the_sign_and_operation() {
+        let lang = |k: &str| {
+            Some(
+                match k {
+                    "attribute.modifier.plus.2" => "+%s%% %s",
+                    "attribute.modifier.take.2" => "-%s%% %s",
+                    "attribute.name.movement_speed" => "Speed",
+                    _ => return None,
+                }
+                .to_owned(),
+            )
+        };
+        assert_eq!(
+            modifier_line(&lang, "movement_speed", 0.2, 2).as_deref(),
+            Some("+20% Speed")
+        );
+        assert_eq!(
+            modifier_line(&lang, "movement_speed", -0.6, 2).as_deref(),
+            Some("-60% Speed")
+        );
+        assert_eq!(modifier_line(&lang, "movement_speed", 0.0, 2), None);
+    }
+}

crates/horizon-client/src/items.rs

@@ -158,11 +158,32 @@ pub struct ItemStack {
     /// Components beyond count and damage (see `item_data`); None when default.
     pub extra: Option<Box<crate::item_data::StackData>>,
 }
+/// `order`'s items in the registry's order (`command-registries.json`'s
+/// `items`, exported from the game); `order` itself when that is missing.
+fn registry_order(root: &Path, order: &[Arc<str>]) -> Vec<Arc<str>> {
+    let listed: Vec<String> = fs::read(root.join("command-registries.json"))
+        .ok()
+        .and_then(|b| serde_json::from_slice::<Value>(&b).ok())
+        .and_then(|v| serde_json::from_value(v["items"].clone()).ok())
+        .unwrap_or_default();
+    if listed.is_empty() {
+        return order.to_vec();
+    }
+    let known: HashSet<&str> = order.iter().map(|i| &**i).collect();
+    listed
+        .iter()
+        .filter(|i| known.contains(i.as_str()))
+        .map(|i| Arc::from(i.as_str()))
+        .collect()
+}
 /// Item ids standing for a loot table's `minecraft:dynamic` entries.
 const DYNAMIC: &str = "#dynamic:";
 pub struct Items {
     pub items: HashMap<Arc<str>, ItemInfo>,
     pub order: Vec<Arc<str>>,
+    /// The same items in item registry (network id) order, as vanilla lists
+    /// them; sorted by name when the registry export is missing.
+    pub registry_order: Vec<Arc<str>>,
     /// Block tag name (without '#') -> member block names.
     pub block_tags: HashMap<String, HashSet<String>>,
     pub item_tags: HashMap<String, HashSet<String>>,
@@ -456,9 +477,11 @@ impl Items {
         }
         let loot_root = root.join("data/minecraft/loot_table");
         walk_loot(&loot_root, &loot_root, &mut loot)?;
+        let registry_order = registry_order(root, &order);
         Ok(Self {
             items,
             order,
+            registry_order,
             block_tags: load_tags(root, "block")?,
             item_tags: load_tags(root, "item")?,
             item_tag_order: load_tag_lists(root, "item")?,
@@ -474,6 +497,7 @@ impl Items {
         Ok(Self {
             items: HashMap::new(),
             order: Vec::new(),
+            registry_order: Vec::new(),
             block_tags: load_tags(root, "block")?,
             item_tags: load_tags(root, "item")?,
             item_tag_order: load_tag_lists(root, "item")?,
@@ -487,6 +511,7 @@ impl Items {
         Self {
             items: HashMap::new(),
             order: Vec::new(),
+            registry_order: Vec::new(),
             block_tags: HashMap::new(),
             item_tag_order: item_tags
                 .iter()

crates/horizon-client/src/lan/advancements.rs

@@ -0,0 +1,304 @@
+//! A player's advancements on a server (PlayerAdvancements): on the
+//! player's first tick the `minecraft:tick` criteria are met, the
+//! advancements they complete grant their recipes (ServerRecipeBook.addRecipes:
+//! ClientboundRecipeBookAddPacket) and the advancements the player may see go
+//! out in ClientboundUpdateAdvancementsPacket (PlayerAdvancements.flushDirty).
+use super::data::{SyncData, json_to_nbt};
+use crate::{advancements::Tree, recipe_book::RecipeIndex};
+use horizon_protocol::buf::Writer;
+use serde_json::Value;
+use std::{
+    collections::{BTreeMap, HashMap},
+    path::Path,
+};
+
+pub struct ServerAdvancements {
+    tree: Tree,
+    kids: Vec<Vec<usize>>,
+    layout: Vec<Option<(i32, f32)>>,
+    /// Recipe files by id.
+    recipes: BTreeMap<String, Value>,
+    displays: RecipeIndex,
+    /// RecipeManager.unpackRecipeInfo's group numbers.
+    groups: HashMap<String, i32>,
+}
+
+/// What the first tick sends: ClientboundRecipeBookAddPacket's payload (when
+/// recipes were unlocked) and ClientboundUpdateAdvancementsPacket's.
+pub struct FirstTick {
+    pub recipe_book_add: Option<Vec<u8>>,
+    pub update_advancements: Vec<u8>,
+}
+
+impl ServerAdvancements {
+    pub fn load(resources: &Path) -> Self {
+        let tree = Tree::load(&resources.join("data"));
+        let kids = tree.children();
+        let layout = tree.layout();
+        let mut recipes = BTreeMap::new();
+        super::recipes::recipes(&resources.join("data/minecraft/recipe"), "", &mut recipes);
+        let mut groups = HashMap::new();
+        for r in recipes.values() {
+            if let Some(g) = r["group"].as_str().filter(|g| !g.is_empty()) {
+                let next = groups.len() as i32;
+                groups.entry(g.to_owned()).or_insert(next);
+            }
+        }
+        Self {
+            tree,
+            kids,
+            layout,
+            recipes,
+            displays: RecipeIndex::load(resources),
+            groups,
+        }
+    }
+
+    /// The first tick of a player without advancements.
+    pub fn first_tick(&self, sync: &SyncData, now_millis: i64) -> FirstTick {
+        // CriteriaTriggers.TICK: the criteria it meets, and what they complete.
+        let mut obtained: Vec<Vec<&str>> = vec![Vec::new(); self.tree.list.len()];
+        for (i, a) in self.tree.list.iter().enumerate() {
+            for c in &a.criteria {
+                if c.trigger == "minecraft:tick" && c.conditions.is_null() {
+                    obtained[i].push(&c.name);
+                }
+            }
+        }
+        let done: Vec<bool> = self
+            .tree
+            .list
+            .iter()
+            .zip(&obtained)
+            .map(|(a, got)| {
+                !a.requirements.is_empty()
+                    && a.requirements
+                        .iter()
+                        .all(|group| group.iter().any(|c| got.contains(&c.as_str())))
+            })
+            .collect();
+        // AdvancementRewards.grant: the recipes, in the advancements' order.
+        let mut entries = Vec::new();
+        for (i, a) in self.tree.list.iter().enumerate() {
+            if !done[i] {
+                continue;
+            }
+            for id in &a.rewards.recipes {
+                entries.extend(self.book_entries(id, sync));
+            }
+        }
+        let recipe_book_add = (!entries.is_empty()).then(|| {
+            let mut w = Writer::new();
+            w.varint(entries.len() as i32);
+            for e in entries {
+                w.data.extend(e);
+            }
+            w.bool(false); // not a replacement
+            w.data
+        });
+        // flushDirty: every advancement the player may see, and its progress.
+        let visible = self.tree.visible(&self.kids, |i| done[i]);
+        let shown: Vec<usize> = (0..self.tree.list.len()).filter(|i| visible[*i]).collect();
+        let mut w = Writer::new();
+        w.bool(true); // the first packet resets the client's advancements
+        w.varint(shown.len() as i32);
+        for &i in &shown {
+            let a = &self.tree.list[i];
+            w.string(&a.id);
+            w.bool(a.parent.is_some());
+            if let Some(p) = &a.parent {
+                w.string(p);
+            }
+            w.bool(a.display.is_some());
+            if let Some(d) = &a.display {
+                w.nbt(&json_to_nbt(&d.title));
+                w.nbt(&json_to_nbt(&d.description));
+                w.varint(sync.id("minecraft:item", &d.icon).unwrap_or(0));
+                w.varint(1);
+                w.varint(0);
+                w.varint(0);
+                w.varint(match d.frame {
+                    crate::advancements::Frame::Task => 0,
+                    crate::advancements::Frame::Challenge => 1,
+                    crate::advancements::Frame::Goal => 2,
+                });
+                w.i32(
+                    i32::from(d.background.is_some())
+                        | i32::from(d.show_toast) << 1
+                        | i32::from(d.hidden) << 2,
+                );
+                if let Some(b) = &d.background {
+                    w.string(b);
+                }
+            }
+            w.varint(a.requirements.len() as i32);
+            for group in &a.requirements {
+                w.varint(group.len() as i32);
+                for c in group {
+                    w.string(c);
+                }
+            }
+            w.bool(false); // sends_telemetry_event
+            let (x, y) = self.layout[i].unwrap_or((0, 0.0));
+            w.f32(x as f32);
+            w.f32(y);
+        }
+        w.varint(0); // nothing removed
+        w.varint(shown.len() as i32);
+        for &i in &shown {
+            let a = &self.tree.list[i];
+            w.string(&a.id);
+            w.varint(a.criteria.len() as i32);
+            for c in &a.criteria {
+                w.string(&c.name);
+                let got = obtained[i].contains(&c.name.as_str());
+                w.bool(got);
+                if got {
+                    w.i64(now_millis);
+                }
+            }
+        }
+        w.bool(true); // show the advancements
+        FirstTick {
+            recipe_book_add,
+            update_advancements: w.data,
+        }
+    }
+
+    /// ClientboundRecipeBookAddPacket.Entry for each display of a recipe:
+    /// highlighted, and with a notification unless the recipe turns it off.
+    fn book_entries(&self, id: &str, sync: &SyncData) -> Vec<Vec<u8>> {
+        let Some(r) = self.recipes.get(id) else {
+            return Vec::new();
+        };
+        let ids = self.displays.display_ids(id);
+        if ids.len() != 1 {
+            // Special recipes have no display; transmutations aren't unlocked on joining.
+            return Vec::new();
+        }
+        let kind = r["type"].as_str().unwrap_or("");
+        let item = |n: &str| sync.id("minecraft:item", n).unwrap_or(0);
+        let slot = |n: &str| sync.id("minecraft:slot_display", n).unwrap_or(0);
+        let mut w = Writer::new();
+        w.varint(ids.start);
+        let (ingredients, category): (Vec<Option<&Value>>, &str) = match kind {
+            "minecraft:crafting_shaped" => {
+                let pattern = shrink(r["pattern"].as_array().map_or(&[][..], |p| p));
+                let (width, height) = (pattern.first().map_or(0, Vec::len), pattern.len());
+                w.varint(sync.id("minecraft:recipe_display", kind).unwrap_or(0));
+                w.varint(width as i32);
+                w.varint(height as i32);
+                let cells: Vec<Option<&Value>> = pattern
+                    .iter()
+                    .flatten()
+                    .map(|c| (*c != ' ').then(|| &r["key"][c.to_string()]))
+                    .collect();
+                (cells, "misc")
+            }
+            "minecraft:crafting_shapeless" => {
+                w.varint(sync.id("minecraft:recipe_display", kind).unwrap_or(0));
+                let cells = r["ingredients"]
+                    .as_array()
+                    .map_or(Vec::new(), |a| a.iter().map(Some).collect());
+                (cells, "misc")
+            }
+            _ => return Vec::new(),
+        };
+        // ShapedCraftingRecipeDisplay / ShapelessCraftingRecipeDisplay:
+        // the ingredients' TagSlotDisplays, the result, the crafting table.
+        w.varint(ingredients.len() as i32);
+        for cell in &ingredients {
+            match cell {
+                Some(v) => {
+                    w.varint(slot("minecraft:tag"));
+                    holder_set(&mut w, v, &item);
+                }
+                None => w.varint(slot("minecraft:empty")),
+            }
+        }
+        w.varint(slot("minecraft:item_stack"));
+        w.varint(item(r["result"]["id"].as_str().unwrap_or("minecraft:air")));
+        w.varint(r["result"]["count"].as_i64().unwrap_or(1) as i32);
+        w.varint(0);
+        w.varint(0);
+        w.varint(slot("minecraft:item"));
+        w.varint(item("minecraft:crafting_table"));
+        // The group, the recipe book category and the placement's ingredients.
+        match r["group"].as_str().and_then(|g| self.groups.get(g)) {
+            Some(g) => w.varint(g + 1),
+            None => w.varint(0),
+        }
+        let category = format!(
+            "minecraft:crafting_{}",
+            match r["category"].as_str().unwrap_or(category) {
+                "building" => "building_blocks",
+                c => c,
+            }
+        );
+        w.varint(
+            sync.id("minecraft:recipe_book_category", &category)
+                .unwrap_or(0),
+        );
+        let placed: Vec<&Value> = ingredients.iter().flatten().copied().collect();
+        w.bool(true);
+        w.varint(placed.len() as i32);
+        for v in placed {
+            holder_set(&mut w, v, &item);
+        }
+        let notify = r["show_notification"].as_bool().unwrap_or(true);
+        w.i8(i8::from(notify) | 2);
+        vec![w.data]
+    }
+}
+
+/// ShapedRecipePattern.shrink: the pattern without blank border rows and columns.
+fn shrink(rows: &[Value]) -> Vec<Vec<char>> {
+    let rows: Vec<Vec<char>> = rows
+        .iter()
+        .map(|r| r.as_str().unwrap_or("").chars().collect())
+        .collect();
+    let used = |r: &Vec<char>| r.iter().any(|c| *c != ' ');
+    let (Some(top), Some(bottom)) = (rows.iter().position(used), rows.iter().rposition(used))
+    else {
+        return Vec::new();
+    };
+    let rows = &rows[top..=bottom];
+    let left = rows
+        .iter()
+        .filter_map(|r| r.iter().position(|c| *c != ' '))
+        .min()
+        .unwrap_or(0);
+    let right = rows
+        .iter()
+        .filter_map(|r| r.iter().rposition(|c| *c != ' '))
+        .max()
+        .unwrap_or(0);
+    rows.iter()
+        .map(|r| {
+            (left..=right)
+                .map(|x| r.get(x).copied().unwrap_or(' '))
+                .collect()
+        })
+        .collect()
+}
+
+/// ByteBufCodecs.holderSet for an ingredient: a tag by name, or the items.
+fn holder_set(w: &mut Writer, v: &Value, item: &dyn Fn(&str) -> i32) {
+    match v {
+        Value::String(s) if s.starts_with('#') => {
+            w.varint(0);
+            w.string(&s[1..]);
+        }
+        Value::String(s) => {
+            w.varint(2);
+            w.varint(item(s));
+        }
+        Value::Array(a) => {
+            w.varint(a.len() as i32 + 1);
+            for s in a {
+                w.varint(item(s.as_str().unwrap_or("")));
+            }
+        }
+        _ => w.varint(1),
+    }
+}

crates/horizon-client/src/lan/command_order.rs

@@ -0,0 +1,892 @@
+//! The order of the children of each node of vanilla's command tree
+//! (path of node names from the root, children in registration order),
+//! for nodes with several children. Generated by
+//! tools/generate_lan_command_order.py; do not edit by hand.
+
+pub const ORDER: &[(&str, &str)] = &[
+    (
+        "",
+        "advancement attribute execute bossbar clear clone compute damage data datapack debug defaultgamemode dialog difficulty effect me enchant experience xp fill fillbiome forceload function gamemode gamerule give help item kick kill list locate loot msg tell w swing particle place playsound posteffect random reload recipe fetchprofile return ride rotate say schedule scoreboard seed version setblock spawnpoint setworldspawn spectate spreadplayers stopsound stopwatch summon tag team teammsg tm teleport tp tellraw test tick time title trigger waypoint weather worldborder jfr ban-ip banlist ban deop op pardon pardon-ip perf save-all save-off save-on setidletimeout stop transfer whitelist publish unpublish",
+    ),
+    ("advancement", "grant revoke"),
+    (
+        "advancement grant targets",
+        "only from until through everything",
+    ),
+    (
+        "advancement revoke targets",
+        "only from until through everything",
+    ),
+    ("attribute target attribute", "get base modifier"),
+    ("attribute target attribute base", "set get reset"),
+    ("attribute target attribute modifier", "add remove value"),
+    (
+        "attribute target attribute modifier add id value",
+        "add_value add_multiplied_base add_multiplied_total",
+    ),
+    (
+        "execute",
+        "run if unless as at store positioned rotated facing align anchored in summon on",
+    ),
+    (
+        "execute if",
+        "block biome loaded dimension score blocks entity predicate function stopwatch data items slots",
+    ),
+    (
+        "execute if score target targetObjective",
+        "= < <= > >= matches",
+    ),
+    ("execute if blocks start end destination", "all masked"),
+    ("execute if data", "entity block storage"),
+    ("execute if items", "entity block"),
+    ("execute if slots", "entity block"),
+    (
+        "execute unless",
+        "block biome loaded dimension score blocks entity predicate function stopwatch data items slots",
+    ),
+    (
+        "execute unless score target targetObjective",
+        "= < <= > >= matches",
+    ),
+    ("execute unless blocks start end destination", "all masked"),
+    ("execute unless data", "entity block storage"),
+    ("execute unless items", "entity block"),
+    ("execute unless slots", "entity block"),
+    ("execute store", "result success"),
+    ("execute store result", "score bossbar entity block storage"),
+    ("execute store result bossbar id", "value max"),
+    (
+        "execute store result entity target path",
+        "int float short long double byte",
+    ),
+    (
+        "execute store result block target path",
+        "int float short long double byte",
+    ),
+    (
+        "execute store result storage target path",
+        "int float short long double byte",
+    ),
+    (
+        "execute store success",
+        "score bossbar entity block storage",
+    ),
+    ("execute store success bossbar id", "value max"),
+    (
+        "execute store success entity target path",
+        "int float short long double byte",
+    ),
+    (
+        "execute store success block target path",
+        "int float short long double byte",
+    ),
+    (
+        "execute store success storage target path",
+        "int float short long double byte",
+    ),
+    ("execute positioned", "pos as over"),
+    ("execute rotated", "rot as"),
+    ("execute facing", "entity pos"),
+    (
+        "execute on",
+        "owner leasher target attacker vehicle controller origin passengers",
+    ),
+    ("bossbar", "add remove list set get"),
+    (
+        "bossbar set id",
+        "name color style value max visible players",
+    ),
+    (
+        "bossbar set id color",
+        "pink blue red green yellow purple white",
+    ),
+    (
+        "bossbar set id style",
+        "progress notched_6 notched_10 notched_12 notched_20",
+    ),
+    ("bossbar get id", "value max visible players"),
+    ("clone", "begin from"),
+    ("clone begin end", "destination to"),
+    (
+        "clone begin end destination",
+        "replace masked filtered strict",
+    ),
+    ("clone begin end destination replace", "force move normal"),
+    ("clone begin end destination masked", "force move normal"),
+    (
+        "clone begin end destination filtered filter",
+        "force move normal",
+    ),
+    (
+        "clone begin end destination strict",
+        "replace masked filtered",
+    ),
+    (
+        "clone begin end destination strict replace",
+        "force move normal",
+    ),
+    (
+        "clone begin end destination strict masked",
+        "force move normal",
+    ),
+    (
+        "clone begin end destination strict filtered filter",
+        "force move normal",
+    ),
+    (
+        "clone begin end to targetDimension destination",
+        "replace masked filtered strict",
+    ),
+    (
+        "clone begin end to targetDimension destination replace",
+        "force move normal",
+    ),
+    (
+        "clone begin end to targetDimension destination masked",
+        "force move normal",
+    ),
+    (
+        "clone begin end to targetDimension destination filtered filter",
+        "force move normal",
+    ),
+    (
+        "clone begin end to targetDimension destination strict",
+        "replace masked filtered",
+    ),
+    (
+        "clone begin end to targetDimension destination strict replace",
+        "force move normal",
+    ),
+    (
+        "clone begin end to targetDimension destination strict masked",
+        "force move normal",
+    ),
+    (
+        "clone begin end to targetDimension destination strict filtered filter",
+        "force move normal",
+    ),
+    ("clone from sourceDimension begin end", "destination to"),
+    (
+        "clone from sourceDimension begin end destination",
+        "replace masked filtered strict",
+    ),
+    (
+        "clone from sourceDimension begin end destination replace",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end destination masked",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end destination filtered filter",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end destination strict",
+        "replace masked filtered",
+    ),
+    (
+        "clone from sourceDimension begin end destination strict replace",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end destination strict masked",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end destination strict filtered filter",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination",
+        "replace masked filtered strict",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination replace",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination masked",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination filtered filter",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination strict",
+        "replace masked filtered",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination strict replace",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination strict masked",
+        "force move normal",
+    ),
+    (
+        "clone from sourceDimension begin end to targetDimension destination strict filtered filter",
+        "force move normal",
+    ),
+    ("compute", "default block entity"),
+    ("compute default", "float integer"),
+    ("compute block computePos", "float integer"),
+    ("compute entity computeTarget", "float integer"),
+    ("damage target amount damageType", "at by"),
+    ("data", "merge get remove modify"),
+    ("data merge", "entity block storage"),
+    ("data get", "entity block storage"),
+    ("data remove", "entity block storage"),
+    ("data modify", "entity block storage"),
+    (
+        "data modify entity target targetPath",
+        "insert prepend append set merge",
+    ),
+    (
+        "data modify entity target targetPath insert index",
+        "from string compute value",
+    ),
+    (
+        "data modify entity target targetPath insert index from",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath insert index string",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath insert index compute",
+        "default block entity",
+    ),
+    (
+        "data modify entity target targetPath insert index compute default",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath insert index compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath insert index compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath prepend",
+        "from string compute value",
+    ),
+    (
+        "data modify entity target targetPath prepend from",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath prepend string",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath prepend compute",
+        "default block entity",
+    ),
+    (
+        "data modify entity target targetPath prepend compute default",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath prepend compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath prepend compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath append",
+        "from string compute value",
+    ),
+    (
+        "data modify entity target targetPath append from",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath append string",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath append compute",
+        "default block entity",
+    ),
+    (
+        "data modify entity target targetPath append compute default",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath append compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath append compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath set",
+        "from string compute value",
+    ),
+    (
+        "data modify entity target targetPath set from",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath set string",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath set compute",
+        "default block entity",
+    ),
+    (
+        "data modify entity target targetPath set compute default",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath set compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath set compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath merge",
+        "from string compute value",
+    ),
+    (
+        "data modify entity target targetPath merge from",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath merge string",
+        "entity block storage",
+    ),
+    (
+        "data modify entity target targetPath merge compute",
+        "default block entity",
+    ),
+    (
+        "data modify entity target targetPath merge compute default",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath merge compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify entity target targetPath merge compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath",
+        "insert prepend append set merge",
+    ),
+    (
+        "data modify block target targetPath insert index",
+        "from string compute value",
+    ),
+    (
+        "data modify block target targetPath insert index from",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath insert index string",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath insert index compute",
+        "default block entity",
+    ),
+    (
+        "data modify block target targetPath insert index compute default",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath insert index compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath insert index compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath prepend",
+        "from string compute value",
+    ),
+    (
+        "data modify block target targetPath prepend from",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath prepend string",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath prepend compute",
+        "default block entity",
+    ),
+    (
+        "data modify block target targetPath prepend compute default",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath prepend compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath prepend compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath append",
+        "from string compute value",
+    ),
+    (
+        "data modify block target targetPath append from",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath append string",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath append compute",
+        "default block entity",
+    ),
+    (
+        "data modify block target targetPath append compute default",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath append compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath append compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath set",
+        "from string compute value",
+    ),
+    (
+        "data modify block target targetPath set from",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath set string",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath set compute",
+        "default block entity",
+    ),
+    (
+        "data modify block target targetPath set compute default",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath set compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath set compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath merge",
+        "from string compute value",
+    ),
+    (
+        "data modify block target targetPath merge from",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath merge string",
+        "entity block storage",
+    ),
+    (
+        "data modify block target targetPath merge compute",
+        "default block entity",
+    ),
+    (
+        "data modify block target targetPath merge compute default",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath merge compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify block target targetPath merge compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath",
+        "insert prepend append set merge",
+    ),
+    (
+        "data modify storage target targetPath insert index",
+        "from string compute value",
+    ),
+    (
+        "data modify storage target targetPath insert index from",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath insert index string",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath insert index compute",
+        "default block entity",
+    ),
+    (
+        "data modify storage target targetPath insert index compute default",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath insert index compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath insert index compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath prepend",
+        "from string compute value",
+    ),
+    (
+        "data modify storage target targetPath prepend from",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath prepend string",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath prepend compute",
+        "default block entity",
+    ),
+    (
+        "data modify storage target targetPath prepend compute default",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath prepend compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath prepend compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath append",
+        "from string compute value",
+    ),
+    (
+        "data modify storage target targetPath append from",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath append string",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath append compute",
+        "default block entity",
+    ),
+    (
+        "data modify storage target targetPath append compute default",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath append compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath append compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath set",
+        "from string compute value",
+    ),
+    (
+        "data modify storage target targetPath set from",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath set string",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath set compute",
+        "default block entity",
+    ),
+    (
+        "data modify storage target targetPath set compute default",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath set compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath set compute entity computeTarget",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath merge",
+        "from string compute value",
+    ),
+    (
+        "data modify storage target targetPath merge from",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath merge string",
+        "entity block storage",
+    ),
+    (
+        "data modify storage target targetPath merge compute",
+        "default block entity",
+    ),
+    (
+        "data modify storage target targetPath merge compute default",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath merge compute block computePos",
+        "float integer",
+    ),
+    (
+        "data modify storage target targetPath merge compute entity computeTarget",
+        "float integer",
+    ),
+    ("datapack", "enable disable list create"),
+    ("datapack enable name", "after before last first"),
+    ("datapack list", "available enabled"),
+    ("debug", "start stop function"),
+    ("dialog", "show clear"),
+    ("difficulty", "peaceful easy normal hard"),
+    ("effect", "clear give"),
+    ("effect give targets effect", "seconds infinite"),
+    ("experience", "add set query"),
+    ("experience add target amount", "points levels"),
+    ("experience set target amount", "points levels"),
+    ("experience query target", "points levels"),
+    (
+        "fill from to block",
+        "outline hollow destroy strict replace keep",
+    ),
+    (
+        "fill from to block replace filter",
+        "outline hollow destroy strict",
+    ),
+    ("forceload", "add remove query"),
+    ("forceload remove", "from all"),
+    ("function name", "arguments with"),
+    ("function name with", "entity block storage"),
+    ("item", "replace fill override modify"),
+    ("item replace", "entity block"),
+    ("item replace entity target slots", "from with"),
+    ("item replace entity target slots from", "entity block"),
+    ("item replace block target slots", "from with"),
+    ("item replace block target slots from", "entity block"),
+    ("item fill", "entity block"),
+    ("item fill entity target slots", "from with"),
+    ("item fill entity target slots from", "entity block"),
+    ("item fill block target slots", "from with"),
+    ("item fill block target slots from", "entity block"),
+    ("item override", "entity block"),
+    ("item override entity target slots", "from with"),
+    ("item override entity target slots from", "entity block"),
+    ("item override block target slots", "from with"),
+    ("item override block target slots from", "entity block"),
+    ("item modify", "entity block"),
+    ("locate", "structure biome poi"),
+    ("loot", "replace insert give spawn"),
+    ("loot replace", "entity block"),
+    (
+        "loot replace entity entities slot",
+        "fish loot kill mine count",
+    ),
+    (
+        "loot replace entity entities slot fish loot_table pos",
+        "tool mainhand offhand",
+    ),
+    (
+        "loot replace entity entities slot mine pos",
+        "tool mainhand offhand",
+    ),
+    (
+        "loot replace entity entities slot count",
+        "fish loot kill mine",
+    ),
+    (
+        "loot replace entity entities slot count fish loot_table pos",
+        "tool mainhand offhand",
+    ),
+    (
+        "loot replace entity entities slot count mine pos",
+        "tool mainhand offhand",
+    ),
+    (
+        "loot replace block targetPos slot",
+        "fish loot kill mine count",
+    ),
+    (
+        "loot replace block targetPos slot fish loot_table pos",
+        "tool mainhand offhand",
+    ),
+    (
+        "loot replace block targetPos slot mine pos",
+        "tool mainhand offhand",
+    ),
+    (
+        "loot replace block targetPos slot count",
+        "fish loot kill mine",
+    ),
+    (
+        "loot replace block targetPos slot count fish loot_table pos",
+        "tool mainhand offhand",
+    ),
+    (
+        "loot replace block targetPos slot count mine pos",
+        "tool mainhand offhand",
+    ),
+    ("loot insert targetPos", "fish loot kill mine"),
+    (
+        "loot insert targetPos fish loot_table pos",
+        "tool mainhand offhand",
+    ),
+    ("loot insert targetPos mine pos", "tool mainhand offhand"),
+    ("loot give players", "fish loot kill mine"),
+    (
+        "loot give players fish loot_table pos",
+        "tool mainhand offhand",
+    ),
+    ("loot give players mine pos", "tool mainhand offhand"),
+    ("loot spawn targetPos", "fish loot kill mine"),
+    (
+        "loot spawn targetPos fish loot_table pos",
+        "tool mainhand offhand",
+    ),
+    ("loot spawn targetPos mine pos", "tool mainhand offhand"),
+    ("swing targets", "mainhand offhand"),
+    ("particle name pos delta speed count", "force normal"),
+    ("place", "feature jigsaw structure template"),
+    (
+        "playsound sound",
+        "master music record weather block hostile neutral player ambient voice ui",
+    ),
+    ("posteffect", "add clear list remove"),
+    ("random", "value roll reset"),
+    ("random reset", "* sequence"),
+    ("recipe", "give take"),
+    ("recipe give targets", "recipe *"),
+    ("recipe take targets", "recipe *"),
+    ("fetchprofile", "name id entity"),
+    ("return", "value fail run"),
+    ("ride target", "mount dismount"),
+    ("rotate target", "rotation facing"),
+    ("rotate target facing", "entity facingLocation"),
+    ("schedule", "function clear"),
+    ("schedule function function time", "append replace"),
+    ("scoreboard", "objectives players"),
+    ("scoreboard objectives", "list add modify remove setdisplay"),
+    (
+        "scoreboard objectives modify objective",
+        "displayname rendertype displayautoupdate numberformat",
+    ),
+    (
+        "scoreboard objectives modify objective rendertype",
+        "integer hearts",
+    ),
+    (
+        "scoreboard objectives modify objective numberformat",
+        "blank fixed styled",
+    ),
+    (
+        "scoreboard players",
+        "list set get add remove reset enable display operation",
+    ),
+    ("scoreboard players display", "name numberformat"),
+    (
+        "scoreboard players display numberformat targets objective",
+        "blank fixed styled",
+    ),
+    ("setblock pos block", "destroy keep replace strict"),
+    (
+        "spreadplayers center spreadDistance maxRange",
+        "respectTeams under",
+    ),
+    (
+        "stopsound targets",
+        "* master music record weather block hostile neutral player ambient voice ui",
+    ),
+    ("stopwatch", "create query restart remove"),
+    ("tag targets", "add remove list"),
+    ("team", "list add remove empty join leave modify"),
+    (
+        "team modify team",
+        "displayName color friendlyFire seeFriendlyInvisibles nametagVisibility deathMessageVisibility collisionRule prefix suffix",
+    ),
+    ("team modify team color", "reset value"),
+    (
+        "team modify team nametagVisibility",
+        "never hideForOtherTeams hideForOwnTeam always",
+    ),
+    (
+        "team modify team deathMessageVisibility",
+        "never hideForOtherTeams hideForOwnTeam always",
+    ),
+    (
+        "team modify team collisionRule",
+        "never pushOwnTeam pushOtherTeams always",
+    ),
+    ("teleport", "location destination targets"),
+    ("teleport targets", "location destination"),
+    ("teleport targets location", "rotation facing"),
+    ("teleport targets location facing", "entity facingLocation"),
+    (
+        "test",
+        "run runmultiple runthese runclosest runthat runfailed verify locate resetclosest resetthese resetthat clearthat clearthese clearall stop pos create",
+    ),
+    ("test runfailed", "onlyRequiredTests numberOfTimes"),
+    ("tick", "query rate step sprint unfreeze freeze"),
+    ("tick step", "stop time"),
+    ("tick sprint", "stop time"),
+    ("time", "set add pause resume rate query of"),
+    ("time set", "time timemarker"),
+    ("time query", "time timeline gametime"),
+    ("time of clock", "set add pause resume rate query"),
+    ("time of clock set", "time timemarker"),
+    ("time of clock query", "time timeline"),
+    (
+        "title targets",
+        "clear reset title subtitle actionbar times",
+    ),
+    ("trigger objective", "add set"),
+    ("waypoint", "list modify"),
+    ("waypoint modify waypoint", "color style"),
+    ("waypoint modify waypoint color", "color hex reset"),
+    ("waypoint modify waypoint style", "reset set"),
+    ("weather", "clear rain thunder"),
+    ("worldborder", "add set center damage get warning"),
+    ("worldborder damage", "amount buffer"),
+    ("worldborder warning", "distance time"),
+    ("jfr", "start stop"),
+    ("banlist", "ips players"),
+    ("perf", "start stop"),
+    ("whitelist", "on off list add remove reload"),
+];

crates/horizon-client/src/lan/commands.rs

@@ -4,8 +4,10 @@
 //! use and the commands of the server kind (dedicated servers have `op`,
 //! `ban`, `stop` ...; an integrated server `publish`), numbered breadth first
 //! as vanilla does, with the argument parsers' network properties and the
-//! custom suggestion providers (`command_suggestions`).
-use super::command_suggestions::SUGGESTIONS;
+//! custom suggestion providers (`command_suggestions`). The report sorts each
+//! node's children; the tree keeps vanilla's registration order
+//! (`command_order`).
+use super::{command_order::ORDER, command_suggestions::SUGGESTIONS};
 use horizon_protocol::{
     buf::Writer,
     packets::play::{CommandNode, Commands},
@@ -15,6 +17,7 @@ use serde_json::Value;
 use std::{
     collections::{HashMap, VecDeque},
     path::Path,
+    sync::OnceLock,
 };
 
 /// Commands.CommandSelection: registered only on dedicated servers.
@@ -107,7 +110,7 @@ impl CommandTree {
             &mut paths,
         );
         // enumerateNodes: breadth first from the root, each node's children
-        // (in name order) then its redirect target.
+        // (in registration order) then its redirect target.
         let mut ids = vec![None; nodes.len()];
         let mut order = Vec::new();
         let mut queue = VecDeque::from([0usize]);
@@ -170,6 +173,18 @@ fn fill(
     };
     let mut names: Vec<&String> = children.keys().collect();
     names.sort();
+    // Vanilla's registration order; names it doesn't list (the game rules,
+    // registered in an identity-hashed order) keep the report's.
+    static ORDERS: OnceLock<HashMap<&str, Vec<&str>>> = OnceLock::new();
+    let orders = ORDERS.get_or_init(|| {
+        ORDER
+            .iter()
+            .map(|(path, names)| (*path, names.split(' ').collect()))
+            .collect()
+    });
+    if let Some(order) = orders.get(path.join(" ").as_str()) {
+        names.sort_by_key(|n| order.iter().position(|o| o == n).unwrap_or(order.len()));
+    }
     for name in names {
         let child = &children[name];
         let required =
@@ -343,10 +358,11 @@ mod tests {
         assert_eq!(guest.nodes[2].redirect, Some(1));
         let op = tree.packet(2, true, &builtin);
         let names: Vec<_> = op.nodes.iter().map(|n| n.name.as_str()).collect();
+        // The root's children in vanilla's registration order.
         assert_eq!(
             names,
-            ["", "me", "say", "stop", "tell", "action", "message"]
+            ["", "me", "tell", "say", "stop", "action", "message"]
         );
-        assert!(op.nodes[2].restricted);
+        assert!(op.nodes[3].restricted);
     }
 }

crates/horizon-client/src/lan/data.rs

@@ -66,6 +66,9 @@ pub struct SyncData {
     pub features: Vec<String>,
     /// Vanilla's command tree (the commands report), when found.
     pub commands: Option<super::commands::CommandTree>,
+    /// ClientboundUpdateRecipesPacket's payload.
+    pub recipes: Vec<u8>,
+    pub advancements: super::advancements::ServerAdvancements,
 }
 
 /// Every `*.json` under `dir`, as (path without extension relative to dir, value), sorted.
@@ -106,6 +109,29 @@ pub fn json_to_nbt(v: &Value) -> Tag {
     }
 }
 
+/// A component's JSON as NbtOps writes it: a list whose elements differ in
+/// type (translation arguments mixing numbers and components) holds each
+/// element that isn't a compound wrapped in one under the empty key.
+pub fn component_nbt(v: &Value) -> Tag {
+    match v {
+        Value::Array(a) => {
+            let kind = |v: &Value| std::mem::discriminant(&json_to_nbt(v));
+            let mixed = a.windows(2).any(|w| kind(&w[0]) != kind(&w[1]));
+            Tag::List(
+                a.iter()
+                    .map(|e| match component_nbt(e) {
+                        t @ Tag::Compound(_) => t,
+                        t if mixed => Tag::compound([("", t)]),
+                        t => t,
+                    })
+                    .collect(),
+            )
+        }
+        Value::Object(o) => Tag::compound(o.iter().map(|(k, v)| (k.as_str(), component_nbt(v)))),
+        other => json_to_nbt(other),
+    }
+}
+
 impl SyncData {
     pub fn load(resources: &Path) -> Result<Self, String> {
         let builtin = Builtin::find(resources)
@@ -129,14 +155,18 @@ impl SyncData {
             registries.push(((*key).to_owned(), Entries { names, json }));
         }
         let tags = Self::load_tags(&root, &builtin, &dynamic);
-        Ok(Self {
+        let mut sync = Self {
             builtin,
             dynamic,
             registries,
             tags,
             features: vec!["minecraft:vanilla".to_owned()],
             commands: super::commands::CommandTree::load(resources),
-        })
+            recipes: Vec::new(),
+            advancements: super::advancements::ServerAdvancements::load(resources),
+        };
+        sync.recipes = super::recipes::update_recipes(resources, &sync);
+        Ok(sync)
     }
 
     /// The id of a name in a built-in or synchronized registry.