Merge origin/main: game-bugs and launcher 0.1.2

Villager POI search: main's per-search state classification replaces this
branch's state table (same sections skipped, same positions in order).
status keeps main's mob and block-entity counts and this branch's pending
uploads.

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

.github/workflows/launcher.yml

@@ -6,7 +6,7 @@ name: launcher
 on:
   workflow_dispatch:
   push:
-    branches: [launcher]
+    branches: [launcher, 'launcher-*']
     tags: ['launcher-v*']
 
 permissions:
@@ -27,7 +27,12 @@ jobs:
           - os: windows-latest
             asset: horizon-launcher-windows-x64.zip
             binary: horizon-launcher.exe
+            # The C runtime linked in: without it the launcher asks for VCRUNTIME140.dll,
+            # which only the Visual C++ redistributable installs.
+            rustflags: -C target-feature=+crt-static
     runs-on: ${{ matrix.os }}
+    env:
+      RUSTFLAGS: ${{ matrix.rustflags }}
     defaults:
       run:
         working-directory: launcher
@@ -48,6 +53,42 @@ jobs:
         run: grep -qx "version = \"${GITHUB_REF_NAME#launcher-v}\"" Cargo.toml
       - run: cargo test --release --locked --lib
       - run: cargo build --release --locked
+      - name: Only system libraries
+        if: runner.os == 'Windows'
+        run: python ../tools/check_imports.py target/release/${{ matrix.binary }}
+      - name: Smoke test
+        env:
+          HORIZON_LAUNCHER_NO_SELF_UPDATE: '1'
+        run: |
+          set -euo pipefail
+          export HORIZON_LAUNCHER_HOME="${RUNNER_TEMP//\\//}/horizon-launcher-smoke"
+          export HORIZON_HOME="$HORIZON_LAUNCHER_HOME/game"
+          launcher="$PWD/target/release/${{ matrix.binary }}"
+          # GitHub's API rate-limits shared runner addresses now and then: try a few times.
+          retry() { for i in 1 2 3 4; do "$@" && return 0; sleep $((i * 15)); done; return 1; }
+          "$launcher" --version
+          retry "$launcher" versions
+          retry "$launcher" install latest
+          "$launcher" versions --installed
+          "$launcher" links --json
+          "$launcher" menu-style classic
+          grep -qx 'menuStyle:classic' "$HORIZON_HOME/horizon.txt"
+          "$launcher" menu-style horizon
+          clients=("$HORIZON_LAUNCHER_HOME"/versions/v*/horizon-client*)
+          client="${clients[0]}"
+          echo "installed client: $client"
+          # The game's Linux build is the game's to keep portable (release.yml checks it): a
+          # release linked to a Nix store is a warning here, not a broken launcher.
+          soft() { if [[ "$RUNNER_OS" == "Linux" ]]; then "$@" || echo "::warning::$* failed"; else "$@"; fi; }
+          if [[ "$RUNNER_OS" == "Windows" ]]; then
+            python ../tools/check_imports.py "$client"
+            python ../tools/check_imports.py "$launcher"
+          elif [[ "$RUNNER_OS" == "Linux" ]]; then
+            soft python3 ../tools/check_imports.py "$client"
+          fi
+          # The client starts: --help prints before any window or GPU is needed.
+          help() { "$client" --help > "$RUNNER_TEMP/help.txt" 2>&1 && head -3 "$RUNNER_TEMP/help.txt" && grep -q -- '--resources' "$RUNNER_TEMP/help.txt"; }
+          soft help
       - name: Package
         run: |
           mkdir -p 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

.github/workflows/release.yml

@@ -1,7 +1,9 @@
 name: release builds
 # Started by hand: gh workflow run release.yml --ref <branch>
-# Builds the Windows x64 client and uploads the playable folder as an artifact.
-# Linux and macOS builds are made on the development machines.
+# Builds the Windows x64 and Linux x86_64 clients and uploads the playable folders as artifacts.
+# macOS builds are made on the development machines. Linux is built here, on an older Ubuntu,
+# so the binary uses the standard loader and runs on any recent distribution (and on NixOS
+# through nix-ld): a build made on NixOS asks for a /nix/store loader no other system has.
 on:
   workflow_dispatch:
 permissions:
@@ -18,6 +20,10 @@ jobs:
         env:
           RUSTFLAGS: -C target-feature=+crt-static
         run: cargo +stable build --release --locked -p horizon-client --bin horizon-client
+      - name: Only system DLLs
+        # Vulkan and the rest are loaded at run time; a linked non-system DLL is a
+        # "DLL not found" dialog on some players' machines.
+        run: python tools/check_imports.py target/release/horizon-client.exe
       - name: Package
         shell: bash
         run: packaging/package.sh target/release/horizon-client.exe dist/horizon-windows-x64
@@ -25,3 +31,21 @@ jobs:
         with:
           name: horizon-windows-x64
           path: dist/horizon-windows-x64
+  linux:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Rust toolchain
+        run: rustup toolchain install stable --profile minimal
+      - name: ALSA headers
+        run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libasound2-dev
+      - name: Build the client
+        run: cargo +stable build --release --locked -p horizon-client --bin horizon-client
+      - name: Standard loader and libraries only
+        run: python3 tools/check_imports.py target/release/horizon-client
+      - name: Package
+        run: packaging/package.sh target/release/horizon-client dist/horizon-linux-x86_64
+      - uses: actions/upload-artifact@v4
+        with:
+          name: horizon-linux-x86_64
+          path: dist/horizon-linux-x86_64

.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

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

@@ -12,20 +12,37 @@
 </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 100% of what its harnesses compare, pending the final audit (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
@@ -96,22 +105,11 @@ 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
 
-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. Parity is declared complete only after the from-scratch audit (`tools/parity.py --all` on Linux and macOS) and the launch checks on packaged builds pass; see the roadmap.
+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: 100%
 
@@ -140,28 +138,13 @@ them too (Rust uses Java's own float maths on each platform).
 | Audio | 1 | None: the sound engine, sound events, music, situational music, ambience and subtitles match vanilla |
 | 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 |
 
-### What's new since the previous version
-
-- **Every subsystem matches vanilla** in its harnesses: Java parity goes from 88% to 100% of what the harnesses compare.
-- **Dedicated server:** `horizon-client --dedicated --nogui` runs a server that vanilla clients can join (offline mode), with vanilla's server.properties, status ping, chat, recipes, advancements and command tree; Horizon also joins vanilla servers, and LAN discovery matches vanilla.
-- **Worlds from 1.8 onwards** open and are upgraded as vanilla does, superflat worlds included, along with old options.txt and creative hotbars.
-- **Mob AI matches vanilla** tick by tick in 92 scenarios: villagers (breeding and gossip included), the warden and the sculk shrieker summoning it, ghastlings and copper golems sorting chests.
-- **Spawned mobs' gear and enchantments** match vanilla over 24,000 cases.
-- **Screens:** the resource pack screen, the open chat (input, history, command suggestions), the recipe book (drawing, search, ingredient placement), the loom's banner preview, End gateway beams, and player-list heads drawn from players' skins.
-- **Render distance 2** now loads (it used to stay on "Loading terrain…").
-- **macOS gives vanilla's results** in every harness: Rust now uses the float maths Java uses on each platform.
-
 ### Roadmap
 
-1. A from-scratch audit (`tools/parity.py --all`) on Linux and on macOS.
-2. Launch checks on the packaged Linux, macOS and Windows builds.
-3. Remaining 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.
+**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",
-        "architecture": "arm64",
-        "minecraft": "26.3",
-        "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
-        "results": [
-          {
-            "observed_mode": "title",
-            "title_screen_observed": true,
-            "world_loaded": false,
-            "ready_client_ticks": 53,
-            "window_active": true,
-            "framebuffer_width": 1280,
-            "framebuffer_height": 646,
-            "sampled_pixels": 4160,
-            "distinct_sampled_rgb": 1525,
-            "gpu": "Apple Software Renderer",
-            "graphics_backend": "OpenGL",
-            "graphics_driver": "4.1 APPLE-23.1.1",
-            "private_png_sha256": "ed503082baca3a8646e7e864bf363e6e2a705a2b4aade2ec4bae6d3a108b07ab",
-            "profile": "core-performance",
-            "preferred_backend": "opengl",
-            "launcher_exit_code": 0,
-            "backend_attempts": [
-              {
-                "backend": "OpenGL",
-                "operation": "load_library",
-                "result": "success"
-              },
-              {
-                "backend": "OpenGL",
-                "operation": "create_device",
-                "result": "success"
-              }
-            ]
-          },
-          {
-            "observed_mode": "title",
-            "title_screen_observed": true,
-            "world_loaded": false,
-            "ready_client_ticks": 55,
-            "window_active": true,
-            "framebuffer_width": 1280,
-            "framebuffer_height": 646,
-            "sampled_pixels": 4160,
-            "distinct_sampled_rgb": 1855,
-            "gpu": "Apple Software Renderer",
-            "graphics_backend": "OpenGL",
-            "graphics_driver": "4.1 APPLE-23.1.1",
-            "private_png_sha256": "959fe6afbe1897cd9711c083e88ccc617ee9d8669983987abda84e0f5979e82d",
-            "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"
-              }
-            ]
-          }
-        ],
-        "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",
-        "original_mod_sha256": "e651ef49bc97486e8dacfd4b640465c442525cd645e2dba71ddea9fb64347dd8",
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-            "ready_client_ticks": 40,
-            "window_active": true,
-            "framebuffer_width": 1280,
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-            "distinct_sampled_rgb": 1537,
-            "gpu": "Apple Software Renderer",
-            "graphics_backend": "OpenGL",
-            "graphics_driver": "4.1 APPLE-23.1.1",
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-                "backend": "OpenGL",
-                "operation": "load_library",
-                "result": "success"
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-              {
-                "backend": "OpenGL",
-                "operation": "create_device",
-                "result": "success"
-              }
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-            "world_loaded": true,
-            "ready_client_ticks": 40,
-            "window_active": true,
-            "framebuffer_width": 1280,
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-            "graphics_backend": "OpenGL",
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-            "backend_attempts": [
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-                "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."
-        ]
-      }
-    }
-  },
-  "earlier_vulkan_research": {
-    "run": 37191171799,
-    "source_commit": "3858ab38b51f434ebe892b564e013c7c8bcaba45",
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-          "operation": "load_library",
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-        {
-          "backend": "OpenGL",
-          "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."
-  ]
-}

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

@@ -1,303 +0,0 @@
-{
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-  "measurement": "Single fixed-order stationary matched-view Linux software-rendered pair; descriptive observations, not statistical hardware speedup",
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-  "java_vendor": "Ubuntu",
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-    "fov": 70,
-    "graphics_preset": "CUSTOM",
-    "frame_limit": "uncapped",
-    "all_original_controllers": false
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-    "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/graphics/after-4080.json

@@ -0,0 +1,546 @@
+{
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benchmarks/graphics/after-lavapipe.json

@@ -0,0 +1,546 @@
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benchmarks/graphics/baseline-4080.json

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benchmarks/graphics/baseline-lavapipe.json

@@ -0,0 +1,392 @@
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+    }
+  }
+}

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

@@ -1,42 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
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benchmarks/idle-queue-2026-10-03/ubuntu-latest.txt

@@ -1,42 +0,0 @@
-Java openjdk 25.0.4.1 2026-08-18 LTS
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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
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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,
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-                  "result": "success"
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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.",
-            "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."
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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
-type=Object objects=100000 allocated_bytes=1600000 bytes_per_object=16.000
-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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-      "matched_output_lines": 7100
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-  "scope": "Actual client FaceBakery geometry overload with a real unit-atlas sprite and default JOML math options. Identity blockstate transform, all bundled cuboid geometry and synthetic rotations, rescaling, default/explicit UVs, winding, degenerate and reversed bounds, inherited models and missing materials. Positions, UVs and element matrix coefficients compare by float bits. This does not cover blockstate transforms/UV lock, atlas packing, transparency classification, lighting, GPU rendering or gameplay."
-}

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/camera_probe.rs

@@ -5,7 +5,7 @@ use horizon_client::{
     Result,
     camera::{
         AvatarBob, BobState, Camera, CameraEntity, CameraFluid, CameraType, FovPlayer, HurtBob,
-        LivingCamera, UseItem, bob_matrix, field_of_view_modifier,
+        LivingCamera, UseItem, bob_matrix, field_of_view_modifier, perspective,
     },
 };
 use horizon_core::{
@@ -258,6 +258,15 @@ fn camera(c: &Value, out: &mut impl Write) -> Result<()> {
                     fb(fov),
                     fb(hud)
                 )?;
+                let (w, h, far) = (fl(&op[4]), fl(&op[5]), fl(&op[6]));
+                let matrix =
+                    |m: [f32; 16]| m.iter().map(|&x| format!(" {}", fb(x))).collect::<String>();
+                writeln!(
+                    out,
+                    "projection{}{}",
+                    matrix(perspective(fov, w, h, far, 0.05, true)),
+                    matrix(perspective(hud, w, h, far, 0.05, true))
+                )?;
             }
             other => panic!("{other}"),
         }

crates/horizon-client/examples/first_person_probe.rs

@@ -0,0 +1,461 @@
+//! Probe for test_first_person_parity.py: drives horizon_client::first_person
+//! and attack_strength over the harness's scripted clicks, targets and use
+//! results, printing what VanillaFirstPersonOracle prints.
+use horizon_client::{
+    Result,
+    attack_strength::{AttackStrength, HeldStack},
+    first_person::{
+        Clicks, Hand, HandHeights, HandWorld, Hit, SwingAnimation, SwingState, UseResult,
+        swing_duration,
+    },
+};
+use serde_json::Value;
+use std::{
+    collections::HashMap,
+    fs::File,
+    io::{BufRead, BufReader, BufWriter, Write},
+};
+
+fn fb(v: f32) -> String {
+    format!("{:08x}", v.to_bits())
+}
+fn fl(v: &Value) -> f32 {
+    f32::from_bits(u32::from_str_radix(v.as_str().unwrap(), 16).unwrap())
+}
+fn dl(v: &Value) -> f64 {
+    f64::from_bits(u64::from_str_radix(v.as_str().unwrap(), 16).unwrap())
+}
+
+/// An `ItemStack` object: the hands hold indices into `Probe::stacks`, so
+/// shrinking keeps its identity as vanilla's in-place `shrink` does.
+#[derive(Clone)]
+struct Stack {
+    item: String,
+    count: i32,
+}
+impl Stack {
+    fn empty(&self) -> bool {
+        self.item == "minecraft:air" || self.count <= 0
+    }
+    /// `getItem` and `getCount` of an empty stack are air and 0.
+    fn effective(&self) -> (&str, i32) {
+        if self.empty() {
+            ("minecraft:air", 0)
+        } else {
+            (&self.item, self.count)
+        }
+    }
+}
+
+struct Probe<'a> {
+    case: &'a Value,
+    step: &'a Value,
+    creative: bool,
+    stacks: Vec<Stack>,
+    /// The stacks in the main and off hand.
+    hands: [usize; 2],
+    blocks: HashMap<[i32; 3], String>,
+    swing: SwingState,
+    events: Vec<String>,
+    heights: HandHeights,
+}
+fn hand_name(hand: Hand) -> &'static str {
+    match hand {
+        Hand::Main => "main",
+        Hand::Off => "off",
+    }
+}
+impl Probe<'_> {
+    fn stack(&self, hand: Hand) -> &Stack {
+        &self.stacks[self.hands[hand as usize]]
+    }
+    fn new_stack(&mut self, v: &Value) -> usize {
+        // ItemStack.EMPTY is index 0.
+        if v.is_null() {
+            return 0;
+        }
+        self.stacks.push(Stack {
+            item: v[0].as_str().unwrap().into(),
+            count: v[1].as_i64().unwrap() as i32,
+        });
+        self.stacks.len() - 1
+    }
+    fn table<'b>(&'b self, name: &str) -> &'b Value {
+        &self.case["rust"][name]
+    }
+    fn attack_speed(&self) -> f64 {
+        let item = self.stack(Hand::Main).effective().0;
+        self.table("attack_speed").get(item).map_or(4.0, dl)
+    }
+    fn scripted(&mut self, kind: &str, hand: Hand) -> UseResult {
+        let name = self.step["uses"][kind].as_str().unwrap().to_string();
+        self.events
+            .push(format!("use {kind} {} {name}", hand_name(hand)));
+        let result = match name.as_str() {
+            "success" => UseResult::Success { swing: true },
+            "server" | "consume" => UseResult::Success { swing: false },
+            "fail" => UseResult::Fail,
+            _ => UseResult::Pass,
+        };
+        if matches!(result, UseResult::Success { .. }) && self.step["shrink"].as_bool().unwrap() {
+            let i = self.hands[hand as usize];
+            if i != 0 {
+                self.stacks[i].count -= 1;
+            }
+        }
+        result
+    }
+}
+impl HandWorld for Probe<'_> {
+    fn hit(&mut self) -> Hit {
+        let h = &self.step["hit"];
+        match h[0].as_str().unwrap() {
+            "block" => Hit::Block {
+                pos: [0, 1, 2].map(|i| h[i + 1].as_i64().unwrap() as i32),
+                face: h[4].as_u64().unwrap() as u8,
+            },
+            "entity" => Hit::Entity,
+            _ => Hit::Miss,
+        }
+    }
+    fn is_air(&mut self, pos: [i32; 3]) -> bool {
+        self.blocks.get(&pos).is_none_or(|b| b == "minecraft:air")
+    }
+    fn creative(&self) -> bool {
+        self.creative
+    }
+    fn spectator(&self) -> bool {
+        false
+    }
+    fn instabuild(&self) -> bool {
+        self.creative
+    }
+    fn hands_busy(&self) -> bool {
+        self.step["busy"].as_bool().unwrap()
+    }
+    fn using_item(&self) -> bool {
+        self.step["using"].as_bool().unwrap()
+    }
+    fn item_enabled(&mut self, _: Hand) -> bool {
+        true
+    }
+    fn held_empty(&mut self, hand: Hand) -> bool {
+        self.stack(hand).empty()
+    }
+    fn held_count(&mut self, hand: Hand) -> i32 {
+        self.stack(hand).effective().1
+    }
+    fn infinite_materials(&self) -> bool {
+        self.creative
+    }
+    fn cannot_attack(&mut self) -> bool {
+        false
+    }
+    fn piercing_weapon(&mut self) -> bool {
+        false
+    }
+    fn attack_animation(&mut self) -> SwingAnimation {
+        SwingAnimation::DEFAULT
+    }
+    fn interact_animation(&mut self, _: Hand) -> SwingAnimation {
+        SwingAnimation::DEFAULT
+    }
+    fn piercing_attack(&mut self, _: SwingAnimation) {
+        unreachable!()
+    }
+    fn attack_entity(&mut self) -> bool {
+        self.events.push("attack".into());
+        true
+    }
+    fn block_action_restricted(&mut self, _: [i32; 3]) -> bool {
+        false
+    }
+    fn within_border(&mut self, _: [i32; 3]) -> bool {
+        true
+    }
+    fn attack_block(&mut self, _: [i32; 3]) {}
+    /// `BlockBehaviour.getDestroyProgress` with `Player.getDestroySpeed` for
+    /// a player on the ground, out of water, with no mining efficiency.
+    fn destroy_progress(&mut self, pos: [i32; 3]) -> f32 {
+        let block = self.blocks.get(&pos).cloned().unwrap_or_default();
+        let b = &self.table("blocks")[block.as_str()];
+        let hardness = fl(&b[0]);
+        if hardness == -1.0 {
+            return 0.0;
+        }
+        let item = self.stack(Hand::Main).effective().0.to_string();
+        let tool = &self.table("tools")[format!("{item} {block}").as_str()];
+        let (mut speed, correct) = if tool.is_null() {
+            (1.0f32, false)
+        } else {
+            (fl(&tool[0]), tool[1].as_bool().unwrap())
+        };
+        if let Some(amp) = self.case["haste"].as_i64() {
+            speed *= 1.0 + (amp as i32 + 1) as f32 * 0.2;
+        }
+        if let Some(amp) = self.case["fatigue"].as_i64() {
+            speed *= horizon_core::jmath::pow(0.3, f64::from(amp as i32 + 1)) as f32;
+        }
+        let harvest = !b[1].as_bool().unwrap() || correct;
+        speed / hardness / if harvest { 30.0 } else { 100.0 }
+    }
+    fn destroy_block(&mut self, pos: [i32; 3]) -> bool {
+        let item = self.stack(Hand::Main).effective().0;
+        // Item.canDestroyBlock: swords' tools cannot destroy in creative.
+        let sword = item.ends_with("_sword");
+        let ok = !(sword && self.creative) && !self.is_air(pos);
+        if ok {
+            self.blocks.insert(pos, "minecraft:air".into());
+        }
+        self.events
+            .push(format!("destroy {} {} {} {ok}", pos[0], pos[1], pos[2]));
+        ok
+    }
+    /// The stack object itself: `destroyingItem` is a reference.
+    fn main_hand_key(&mut self) -> String {
+        self.hands[0].to_string()
+    }
+    fn same_destroying_item(&mut self, key: &str) -> bool {
+        // ItemStack.EMPTY (index 0) before any break.
+        let then = &self.stacks[key.parse::<usize>().unwrap_or(0)];
+        then.effective().0 == self.stack(Hand::Main).effective().0
+    }
+    fn destroy_stage(&mut self, pos: [i32; 3], stage: Option<i32>) {
+        self.events.push(format!(
+            "stage {} {} {} {}",
+            pos[0],
+            pos[1],
+            pos[2],
+            stage.unwrap_or(-1)
+        ));
+    }
+    fn swing(&mut self, hand: Hand, animation: SwingAnimation) {
+        let duration = swing_duration(
+            animation,
+            self.case["haste"].as_i64().map(|a| a as i32),
+            self.case["fatigue"].as_i64().map(|a| a as i32),
+        );
+        let started = self.swing.start_if_able(hand, animation, duration);
+        self.events.push(format!(
+            "swing {} {} {started}",
+            hand_name(hand),
+            animation.duration
+        ));
+    }
+    fn reset_attack_strength(&mut self) {
+        unreachable!("ResetWorld resets the tickers")
+    }
+    fn entity_within_border(&mut self) -> bool {
+        true
+    }
+    fn use_on_entity(&mut self, hand: Hand) -> Option<UseResult> {
+        self.step["hit"][1]
+            .as_bool()
+            .unwrap()
+            .then(|| self.scripted("entity", hand))
+    }
+    fn use_on_block(&mut self, hand: Hand) -> UseResult {
+        self.scripted("block", hand)
+    }
+    fn use_item(&mut self, hand: Hand) -> UseResult {
+        self.scripted("item", hand)
+    }
+    fn item_used(&mut self, hand: Hand) {
+        self.events.push(format!("used {}", hand_name(hand)));
+        self.heights.item_used(hand);
+    }
+    fn release_using(&mut self) {
+        self.events.push("release".into());
+    }
+}
+fn held(stack: &Stack) -> Option<HeldStack> {
+    (!stack.empty()).then(|| HeldStack {
+        item: stack.item.clone(),
+        rest: stack.count.to_string(),
+    })
+}
+
+fn run(case: &Value, out: &mut impl Write) -> Result<()> {
+    let empty = Value::Null;
+    let mut probe = Probe {
+        case,
+        step: &empty,
+        creative: case["creative"].as_bool().unwrap(),
+        stacks: vec![Stack {
+            item: "minecraft:air".into(),
+            count: 0,
+        }],
+        hands: [0, 0],
+        blocks: case["blocks"]
+            .as_array()
+            .unwrap()
+            .iter()
+            .map(|b| {
+                (
+                    [0, 1, 2].map(|i| b[i].as_i64().unwrap() as i32),
+                    b[3].as_str().unwrap().to_string(),
+                )
+            })
+            .collect(),
+        swing: SwingState::default(),
+        events: Vec::new(),
+        heights: HandHeights::default(),
+    };
+    probe.hands[0] = probe.new_stack(&case["main"]);
+    probe.hands[1] = probe.new_stack(&case["off"]);
+    writeln!(out, "attack_speed {:x}", probe.attack_speed().to_bits())?;
+    let mut clicks = Clicks::default();
+    let mut strength = AttackStrength::default();
+    // FirstPersonHandsAndItems' visible items start as ItemStack.EMPTY.
+    let mut visible = [0usize, 0usize];
+    for (s, step) in case["steps"].as_array().unwrap().iter().enumerate() {
+        probe.step = step;
+        probe.events.clear();
+        if !step["set"].is_null() {
+            let i = probe.new_stack(&step["set"]["stack"]);
+            let hand = if step["set"]["hand"] == "main" { 0 } else { 1 };
+            probe.hands[hand] = i;
+        }
+        clicks.tick(
+            &mut ResetWorld {
+                probe: &mut probe,
+                strength: &mut strength,
+            },
+            step["ac"].as_u64().unwrap() as u32,
+            step["uc"].as_u64().unwrap() as u32,
+            step["ad"].as_bool().unwrap(),
+            step["ud"].as_bool().unwrap(),
+        );
+        probe.swing.tick();
+        let main = probe.stack(Hand::Main).clone();
+        strength.tick(held(&main));
+        // FirstPersonHandsAndItems.tick: shouldInstantlyReplaceVisibleItem
+        // (ItemStack.matchesIgnoringComponents; every item plays the swap
+        // animation), then the heights.
+        let mut changed = [false; 2];
+        for h in 0..2 {
+            let (a, b) = (visible[h], probe.hands[h]);
+            let same = a == b || probe.stacks[a].effective() == probe.stacks[b].effective();
+            if same {
+                visible[h] = b;
+            }
+            changed[h] = visible[h] != b;
+        }
+        let speed = probe.attack_speed();
+        let replace = probe.heights.tick(
+            probe.step["busy"].as_bool().unwrap(),
+            strength.swap_scale(1.0, speed),
+            changed,
+        );
+        for h in 0..2 {
+            if replace[h] {
+                visible[h] = probe.hands[h];
+            }
+        }
+        for e in &probe.events {
+            writeln!(out, "{e}")?;
+        }
+        let sw = &probe.swing;
+        let current = sw.current.map_or("- 0".to_string(), |c| {
+            format!("{} {}", hand_name(c.hand), c.duration_ticks)
+        });
+        let h = &probe.heights;
+        let d = &clicks.destroying;
+        writeln!(
+            out,
+            "tick {s} {current} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {}",
+            sw.ticks,
+            fb(sw.animation),
+            fb(sw.old_animation),
+            fb(sw.animation(0.5)),
+            strength.ticker,
+            strength.swap_ticker,
+            fb(strength.swap_scale(1.0, speed)),
+            fb(h.main),
+            fb(h.old_main),
+            fb(h.off),
+            fb(h.old_off),
+            clicks.miss_time,
+            clicks.right_click_delay,
+            d.delay,
+            d.active,
+            fb(d.progress)
+        )?;
+    }
+    Ok(())
+}
+
+/// The probe with the attack-strength tickers it resets.
+struct ResetWorld<'p, 'c> {
+    probe: &'p mut Probe<'c>,
+    strength: &'p mut AttackStrength,
+}
+macro_rules! forward {
+    ($($name:ident($($arg:ident: $t:ty),*) -> $r:ty;)*) => {
+        $(fn $name(&mut self, $($arg: $t),*) -> $r { self.probe.$name($($arg),*) })*
+    };
+}
+impl HandWorld for ResetWorld<'_, '_> {
+    forward! {
+        hit() -> Hit;
+        is_air(pos: [i32; 3]) -> bool;
+        item_enabled(hand: Hand) -> bool;
+        held_empty(hand: Hand) -> bool;
+        held_count(hand: Hand) -> i32;
+        cannot_attack() -> bool;
+        piercing_weapon() -> bool;
+        attack_animation() -> SwingAnimation;
+        interact_animation(hand: Hand) -> SwingAnimation;
+        piercing_attack(a: SwingAnimation) -> ();
+        attack_entity() -> bool;
+        block_action_restricted(pos: [i32; 3]) -> bool;
+        within_border(pos: [i32; 3]) -> bool;
+        attack_block(pos: [i32; 3]) -> ();
+        destroy_progress(pos: [i32; 3]) -> f32;
+        destroy_block(pos: [i32; 3]) -> bool;
+        main_hand_key() -> String;
+        same_destroying_item(key: &str) -> bool;
+        destroy_stage(pos: [i32; 3], stage: Option<i32>) -> ();
+        swing(hand: Hand, a: SwingAnimation) -> ();
+        entity_within_border() -> bool;
+        use_on_entity(hand: Hand) -> Option<UseResult>;
+        use_on_block(hand: Hand) -> UseResult;
+        use_item(hand: Hand) -> UseResult;
+        item_used(hand: Hand) -> ();
+        release_using() -> ();
+    }
+    fn creative(&self) -> bool {
+        self.probe.creative()
+    }
+    fn spectator(&self) -> bool {
+        false
+    }
+    fn instabuild(&self) -> bool {
+        self.probe.instabuild()
+    }
+    fn hands_busy(&self) -> bool {
+        self.probe.hands_busy()
+    }
+    fn using_item(&self) -> bool {
+        self.probe.using_item()
+    }
+    fn infinite_materials(&self) -> bool {
+        self.probe.infinite_materials()
+    }
+    fn reset_attack_strength(&mut self) {
+        self.strength.reset();
+    }
+}
+
+fn main() -> Result<()> {
+    let args: Vec<String> = std::env::args().collect();
+    let input = BufReader::new(File::open(&args[1])?);
+    let mut out = BufWriter::new(File::create(&args[2])?);
+    for (n, line) in input.lines().enumerate() {
+        let c: Value = serde_json::from_str(&line?)?;
+        writeln!(out, "== {n}")?;
+        run(&c, &mut out)?;
+    }
+    out.flush()?;
+    Ok(())
+}

crates/horizon-client/src/audio.rs

@@ -61,10 +61,78 @@ pub struct Heard {
 pub struct MixerBackend {
     mixer: Arc<Mutex<Mixer>>,
     root: PathBuf,
-    cache: HashMap<String, Option<(Arc<Vec<f32>>, u32)>>,
+    cache: Arc<Mutex<SoundCache>>,
+    /// The decoder thread for static sounds, started with the first one.
+    decoder: Option<std::sync::mpsc::Sender<Decode>>,
     next: ChannelId,
     live: bool,
 }
+/// Decoded samples and their rate (`None`: the file did not load).
+type Samples = Option<(Arc<Vec<f32>>, u32)>;
+/// Decoded static sounds (`SoundBufferLibrary`'s buffers), dropped least
+/// recently used first past `CACHE_BYTES`: kept forever, every sound heard in
+/// a session stayed (up to 1.4 GiB of samples, villages playing hundreds).
+#[derive(Default)]
+struct SoundCache {
+    entries: HashMap<String, (Samples, u64)>,
+    bytes: usize,
+    clock: u64,
+}
+const CACHE_BYTES: usize = 64 << 20;
+impl SoundCache {
+    fn get(&mut self, key: &str) -> Option<Samples> {
+        self.clock += 1;
+        let entry = self.entries.get_mut(key)?;
+        entry.1 = self.clock;
+        Some(entry.0.clone())
+    }
+    fn insert(&mut self, key: String, samples: Samples) {
+        self.clock += 1;
+        self.bytes += Self::size(&samples);
+        if let Some((old, _)) = self.entries.insert(key, (samples, self.clock)) {
+            self.bytes -= Self::size(&old);
+        }
+        while self.bytes > CACHE_BYTES && self.entries.len() > 1 {
+            let Some(oldest) = self
+                .entries
+                .iter()
+                .min_by_key(|(_, (_, used))| *used)
+                .map(|(k, _)| k.clone())
+            else {
+                break;
+            };
+            if let Some((gone, _)) = self.entries.remove(&oldest) {
+                self.bytes -= Self::size(&gone);
+            }
+        }
+    }
+    fn size(samples: &Samples) -> usize {
+        samples
+            .as_ref()
+            .map_or(0, |(s, _)| s.len() * std::mem::size_of::<f32>())
+    }
+}
+/// A static sound to decode for a channel waiting on it.
+struct Decode {
+    key: String,
+    file: PathBuf,
+    channel: ChannelId,
+}
+/// Give a channel waiting on its sound the decoded samples and start it, as
+/// the buffer future attaching and playing the source. A source stopped or
+/// released meanwhile stays so.
+fn attach(mixer: &Mutex<Mixer>, channel: ChannelId, samples: Samples, looping: bool) {
+    if let Some(samples) = samples
+        && let Ok(mut m) = mixer.lock()
+        && let Some(c) = m.channels.get_mut(&channel)
+        && c.state == State::Initial
+    {
+        c.samples = Some(samples);
+        c.position = 0.0;
+        c.state = State::Playing;
+        c.looping |= looping;
+    }
+}
 pub struct Audio {
     _stream: Option<cpal::Stream>,
     pub engine: SoundEngine,
@@ -176,53 +244,59 @@ impl Backend for MixerBackend {
     fn set_relative(&mut self, channel: ChannelId, relative: bool) {
         self.with(channel, |c| c.relative = relative);
     }
-    /// `getCompleteBuffer` (decoded now, cached) or `getStream` (decoded on a
-    /// worker), then attach and `alSourcePlay`. A sound that cannot load
-    /// leaves its source initial, as a failed buffer future does in vanilla.
+    /// `getCompleteBuffer` (cached, else decoded on the decoder thread) or
+    /// `getStream` (decoded on a thread of its own), then attach and
+    /// `alSourcePlay`. A sound that cannot load leaves its source initial,
+    /// as a failed buffer future does in vanilla.
     fn start(&mut self, channel: ChannelId, sound: &Sound, looping: bool) {
         if !self.live {
             return;
         }
         let (namespace, path) = sound.path();
         let file = self.root.join("assets").join(namespace).join(&path);
-        let attach = move |mixer: &Mutex<Mixer>, samples: Option<(Arc<Vec<f32>>, u32)>| {
-            if let Some(samples) = samples
-                && let Ok(mut m) = mixer.lock()
-                && let Some(c) = m.channels.get_mut(&channel)
-            {
-                c.samples = Some(samples);
-                c.position = 0.0;
-                c.state = State::Playing;
-            }
-        };
         if sound.stream {
             // A streamed sound loops by restarting its stream.
             let mixer = self.mixer.clone();
             std::thread::spawn(move || {
                 let samples = decode(&file).map(|(s, r)| (Arc::new(s), r));
-                if looping
-                    && let Ok(mut m) = mixer.lock()
-                    && let Some(c) = m.channels.get_mut(&channel)
-                {
-                    c.looping = true;
-                }
-                attach(&mixer, samples);
+                attach(&mixer, channel, samples, looping);
             });
-        } else {
-            let samples = self
-                .cache
-                .entry(format!("{namespace}:{path}"))
-                .or_insert_with(|| decode(&file).map(|(s, r)| (Arc::new(s), r)))
-                .clone();
-            attach(&self.mixer, samples);
+            return;
         }
-    }
-    fn stop(&mut self, channel: ChannelId) {
-        self.with(channel, |c| {
-            if c.state != State::Initial {
-                c.state = State::Stopped;
-            }
+        let key = format!("{namespace}:{path}");
+        let cached = self.cache.lock().ok().and_then(|mut c| c.get(&key));
+        if let Some(samples) = cached {
+            attach(&self.mixer, channel, samples, false);
+            return;
+        }
+        let decoder = self.decoder.get_or_insert_with(|| {
+            let (send, receive) = std::sync::mpsc::channel::<Decode>();
+            let (mixer, cache) = (self.mixer.clone(), self.cache.clone());
+            std::thread::Builder::new()
+                .name("sound decoder".into())
+                .spawn(move || {
+                    for job in receive {
+                        // Queued twice before the first decode finished.
+                        let cached = cache.lock().ok().and_then(|mut c| c.get(&job.key));
+                        let samples = cached.unwrap_or_else(|| {
+                            let samples = decode(&job.file).map(|(s, r)| (Arc::new(s), r));
+                            if let Ok(mut c) = cache.lock() {
+                                c.insert(job.key, samples.clone());
+                            }
+                            samples
+                        });
+                        attach(&mixer, job.channel, samples, false);
+                    }
+                })
+                .expect("sound decoder thread");
+            send
         });
+        let _ = decoder.send(Decode { key, file, channel });
+    }
+    /// `alSourceStop`: any state becomes stopped, an initial source too (a
+    /// sound still decoding then never starts).
+    fn stop(&mut self, channel: ChannelId) {
+        self.with(channel, |c| c.state = State::Stopped);
     }
     fn pause(&mut self, channel: ChannelId) {
         self.with(channel, |c| {
@@ -327,6 +401,71 @@ fn mix(mixer: &mut Mixer, data: &mut [f32], channels: usize, rate: u32) {
         *s = s.clamp(-1.0, 1.0);
     }
 }
+/// Why the game should not open an output, if it should not:
+/// `HORIZON_NO_AUDIO`, or a virtual screen (`vscreen`), where agents and
+/// harnesses run the game and must stay off the user's speakers.
+/// `HORIZON_AUDIO=1` opens the output anyway (testing into a null sink).
+fn output_disabled(var: impl Fn(&str) -> Option<std::ffi::OsString>) -> Option<String> {
+    if var("HORIZON_NO_AUDIO").is_some() {
+        return Some("audio off: HORIZON_NO_AUDIO is set".into());
+    }
+    if var("HORIZON_AUDIO").is_some_and(|v| v == "1") {
+        return None;
+    }
+    let display = var("WAYLAND_DISPLAY")?;
+    Path::new(&display)
+        .components()
+        .any(|c| c.as_os_str() == "vscreen")
+        .then(|| "audio off on a virtual screen (vscreen); HORIZON_AUDIO=1 opens it".into())
+}
+/// An output stream on `device` in its default configuration, whatever its
+/// sample format: the mixer works in f32 and converts.
+fn open_device(
+    device: &cpal::Device,
+    mixer: Arc<Mutex<Mixer>>,
+) -> Result<(cpal::Stream, cpal::SupportedStreamConfig)> {
+    use cpal::SampleFormat as F;
+    let config = device.default_output_config()?;
+    let stream = match config.sample_format() {
+        F::F32 => build_stream::<f32>(device, &config, mixer),
+        F::F64 => build_stream::<f64>(device, &config, mixer),
+        F::I16 => build_stream::<i16>(device, &config, mixer),
+        F::I32 => build_stream::<i32>(device, &config, mixer),
+        F::I8 => build_stream::<i8>(device, &config, mixer),
+        F::U16 => build_stream::<u16>(device, &config, mixer),
+        F::U32 => build_stream::<u32>(device, &config, mixer),
+        F::U8 => build_stream::<u8>(device, &config, mixer),
+        other => Err(format!("unsupported sample format {other}").into()),
+    }?;
+    stream.play()?;
+    Ok((stream, config))
+}
+fn build_stream<T: cpal::SizedSample + cpal::FromSample<f32>>(
+    device: &cpal::Device,
+    config: &cpal::SupportedStreamConfig,
+    mixer: Arc<Mutex<Mixer>>,
+) -> Result<cpal::Stream> {
+    let rate = config.sample_rate().0;
+    let channels = config.channels() as usize;
+    let mut scratch = Vec::new();
+    let stream = device.build_output_stream(
+        &config.config(),
+        move |data: &mut [T], _| {
+            scratch.resize(data.len(), 0.0f32);
+            if let Ok(mut m) = mixer.lock() {
+                mix(&mut m, &mut scratch, channels, rate);
+            } else {
+                scratch.fill(0.0);
+            }
+            for (out, s) in data.iter_mut().zip(&scratch) {
+                *out = T::from_sample(*s);
+            }
+        },
+        |e| eprintln!("Horizon: audio stream error: {e}"),
+        None,
+    )?;
+    Ok(stream)
+}
 impl Audio {
     pub fn new(root: &Path) -> Self {
         Self::with_output(root, true)
@@ -347,7 +486,7 @@ impl Audio {
             Ok(v) => (Some(v), true),
             Err(e) => {
                 if output {
-                    eprintln!("Horizon: audio unavailable: {e}");
+                    eprintln!("Horizon: no sound: {e}");
                 }
                 (None, false)
             }
@@ -360,7 +499,8 @@ impl Audio {
             backend: MixerBackend {
                 mixer,
                 root: root.to_owned(),
-                cache: HashMap::new(),
+                cache: Arc::default(),
+                decoder: None,
                 next: 0,
                 live,
             },
@@ -374,32 +514,40 @@ impl Audio {
         }
     }
     fn open(mixer: Arc<Mutex<Mixer>>) -> Result<cpal::Stream> {
-        // Test runs (harnesses, agents) launch the game on a virtual screen;
-        // keep them off the user's speakers.
-        if std::env::var_os("HORIZON_NO_AUDIO").is_some() {
-            return Err("audio output disabled by HORIZON_NO_AUDIO".into());
+        if let Some(reason) = output_disabled(|name| std::env::var_os(name)) {
+            return Err(reason.into());
         }
         let host = cpal::default_host();
-        let device = host
-            .default_output_device()
-            .ok_or("no audio output device")?;
-        let config = device.default_output_config()?;
-        let rate = config.sample_rate().0;
-        let channels = config.channels() as usize;
-        let stream = device.build_output_stream(
-            &config.into(),
-            move |data: &mut [f32], _| {
-                if let Ok(mut m) = mixer.lock() {
-                    mix(&mut m, data, channels, rate);
-                } else {
-                    data.fill(0.0);
+        let mut errors = Vec::new();
+        // The default device first, then any other output a host lists:
+        // a default that cannot open (busy, or a stale ALSA default) should
+        // not leave the game silent when another device works.
+        let default = host.default_output_device();
+        let others = host.output_devices().into_iter().flatten();
+        let mut tried = Vec::new();
+        for device in default.into_iter().chain(others) {
+            let name = device.name().unwrap_or_else(|_| "unnamed device".into());
+            if tried.contains(&name) {
+                continue;
+            }
+            tried.push(name.clone());
+            match open_device(&device, mixer.clone()) {
+                Ok((stream, config)) => {
+                    eprintln!(
+                        "Horizon: audio output {name} ({} Hz, {} channels, {})",
+                        config.sample_rate().0,
+                        config.channels(),
+                        config.sample_format()
+                    );
+                    return Ok(stream);
                 }
-            },
-            |e| eprintln!("Horizon: audio stream error: {e}"),
-            None,
-        )?;
-        stream.play()?;
-        Ok(stream)
+                Err(e) => errors.push(format!("{name}: {e}")),
+            }
+        }
+        if errors.is_empty() {
+            return Err(format!("no audio output device on the {} host", host.id().name()).into());
+        }
+        Err(format!("no audio output device opened ({})", errors.join("; ")).into())
     }
     fn bound(&mut self) -> Bound<'_, MixerBackend> {
         Bound {
@@ -525,6 +673,21 @@ impl Audio {
         self.release(id);
     }
     /// Every sound event id (for command completion).
+    /// The engine's table sizes and the mixer's channels (`status`).
+    pub fn census(&self) -> serde_json::Value {
+        let mut census = self.engine.census();
+        census["channels"] = self
+            .backend
+            .mixer
+            .lock()
+            .map_or(0, |m| m.channels.len())
+            .into();
+        if let Ok(cache) = self.backend.cache.lock() {
+            census["decoded"] = cache.entries.len().into();
+            census["decoded_mib"] = (cache.bytes >> 20).into();
+        }
+        census
+    }
     pub fn event_names(&self) -> Vec<String> {
         let mut v: Vec<String> = self.engine.registry.names().cloned().collect();
         v.sort();
@@ -590,6 +753,47 @@ mod tests {
         }
     }
 
+    #[test]
+    fn decoded_sounds_stay_within_the_budget_least_recently_used_out() {
+        let mut cache = SoundCache::default();
+        let quarter = CACHE_BYTES / 4 / std::mem::size_of::<f32>();
+        let sound = || Some((Arc::new(vec![0.0f32; quarter]), 44100));
+        for key in ["a", "b", "c", "d"] {
+            cache.insert(key.into(), sound());
+        }
+        assert!(cache.get("a").is_some());
+        cache.insert("e".into(), sound());
+        assert!(cache.bytes <= CACHE_BYTES);
+        assert!(
+            cache.get("b").is_none(),
+            "the least recently used goes first"
+        );
+        assert!(cache.get("a").is_some() && cache.get("e").is_some());
+        // A failed load is remembered without counting.
+        cache.insert("missing".into(), None);
+        assert_eq!(cache.get("missing"), Some(None));
+    }
+    #[test]
+    fn output_stays_off_on_a_virtual_screen_unless_asked() {
+        let env = |pairs: &'static [(&'static str, &'static str)]| {
+            move |name: &str| {
+                pairs
+                    .iter()
+                    .find(|(k, _)| *k == name)
+                    .map(|(_, v)| std::ffi::OsString::from(*v))
+            }
+        };
+        assert!(output_disabled(env(&[("WAYLAND_DISPLAY", "wayland-1")])).is_none());
+        assert!(output_disabled(env(&[])).is_none());
+        const VSCREEN: &str = "/run/user/1000/vscreen/main/wayland-1";
+        assert!(output_disabled(env(&[("WAYLAND_DISPLAY", VSCREEN)])).is_some());
+        assert!(
+            output_disabled(env(&[("WAYLAND_DISPLAY", VSCREEN), ("HORIZON_AUDIO", "1")])).is_none()
+        );
+        assert!(
+            output_disabled(env(&[("HORIZON_NO_AUDIO", "1"), ("HORIZON_AUDIO", "1")])).is_some()
+        );
+    }
     #[test]
     fn linear_attenuation_reaches_zero_at_the_max_distance() {
         assert_eq!(distance_gain(None, 100.0), 1.0);

crates/horizon-client/src/camera.rs

@@ -583,6 +583,44 @@ impl Camera {
         modify_fov_based_on_death_or_fluid(partial, 70.0, effect_scale, dead, fluid)
     }
 }
+/// `Projection.getMatrix` for a perspective set up by `setupPerspective`:
+/// JOML's `Matrix4f.setPerspective(fov * DEG_TO_RAD, width / height, near,
+/// far, zZeroToOne)`, column-major. Vanilla passes its planes reversed
+/// (`near` is `zFar`); the hand pass here keeps them in order.
+pub fn perspective(
+    fov_degrees: f32,
+    width: f32,
+    height: f32,
+    near: f32,
+    far: f32,
+    zero_to_one: bool,
+) -> [f32; 16] {
+    let h = horizon_core::jmath::tan(f64::from(fov_degrees * DEG_TO_RAD * 0.5)) as f32;
+    let aspect = width / height;
+    let mut m = [0.0f32; 16];
+    m[0] = 1.0 / (h * aspect);
+    m[5] = 1.0 / h;
+    let e = 1.0e-6f32;
+    if far > 0.0 && far.is_infinite() {
+        m[10] = e - 1.0;
+        m[14] = (e - if zero_to_one { 1.0 } else { 2.0 }) * near;
+    } else if near > 0.0 && near.is_infinite() {
+        m[10] = (if zero_to_one { 0.0 } else { 1.0 }) - e;
+        m[14] = ((if zero_to_one { 1.0 } else { 2.0 }) - e) * far;
+    } else {
+        m[10] = (if zero_to_one { far } else { far + near }) / (near - far);
+        m[14] = (if zero_to_one { far } else { far + far }) * near / (near - far);
+    }
+    m[11] = -1.0;
+    m
+}
+/// `GameRenderer.render3dHud`: the first-person hand and held items are
+/// drawn with their own projection at `hudFov` (70 degrees, changed only by
+/// death and fluids), never the FOV option or the sprint, speed and bow
+/// modifier.
+pub fn hand_projection(hud_fov: f32, width: f32, height: f32, far: f32) -> [f32; 16] {
+    perspective(hud_fov, width, height, 0.05, far, true)
+}
 /// `Camera.modifyFovBasedOnDeathOrFluid`. `dead` is the camera entity's
 /// `deathTime` while it is a living entity that is dead or dying.
 pub fn modify_fov_based_on_death_or_fluid(

crates/horizon-client/src/control.rs

@@ -140,10 +140,37 @@ fn serve(stream: UnixStream, sender: &mpsc::Sender<Request>) {
     }
 }
 
-/// Frame durations since the last reset, summarized like the Java recorder.
+/// Frame durations since the last reset, summarized like the Java recorder,
+/// with the CPU part of each frame and GPU times from timestamp queries.
 #[derive(Default)]
 pub struct FrameStats {
     millis: Vec<f32>,
+    cpu: Vec<f32>,
+    gpu: Vec<f32>,
+    /// Milliseconds per frame phase (`PHASES`), one entry per rendered frame.
+    phases: Vec<[f32; PHASES.len()]>,
+}
+
+/// The parts of a frame's CPU time: world streaming and uploads, game ticks,
+/// building the frame's geometry and HUD, and the renderer's own work.
+pub const PHASES: [&str; 4] = ["update", "tick", "prepare", "render"];
+
+fn percentiles(values: &[f32]) -> serde_json::Value {
+    let mut sorted = values.to_vec();
+    sorted.sort_by(f32::total_cmp);
+    let n = sorted.len();
+    if n == 0 {
+        return serde_json::Value::Null;
+    }
+    let total: f64 = sorted.iter().map(|&m| f64::from(m)).sum();
+    let percentile = |p: f64| sorted[((n as f64 * p).ceil() as usize).clamp(1, n) - 1];
+    serde_json::json!({
+        "avg_ms": total / n as f64,
+        "p50_ms": percentile(0.5),
+        "p95_ms": percentile(0.95),
+        "p99_ms": percentile(0.99),
+        "max_ms": sorted[n - 1],
+    })
 }
 
 impl FrameStats {
@@ -153,8 +180,48 @@ impl FrameStats {
             self.millis.push(millis);
         }
     }
+    /// The frame's own work: its duration minus waits for the GPU, the
+    /// display and the frame limiter.
+    pub fn record_cpu(&mut self, millis: f32) {
+        if self.cpu.len() < Self::LIMIT {
+            self.cpu.push(millis);
+        }
+    }
+    pub fn record_phases(&mut self, millis: [f32; PHASES.len()]) {
+        if self.phases.len() < Self::LIMIT {
+            self.phases.push(millis);
+        }
+    }
+    /// Average milliseconds per phase over the frames whose CPU time is at
+    /// least `min_cpu` (all frames for 0): where the slow frames go.
+    fn phase_average(&self, min_cpu: f32) -> serde_json::Value {
+        let mut sums = [0.0f64; PHASES.len()];
+        let mut n = 0;
+        for (i, phases) in self.phases.iter().enumerate() {
+            if self.cpu.get(i).is_some_and(|&c| c >= min_cpu) {
+                for (sum, m) in sums.iter_mut().zip(phases) {
+                    *sum += f64::from(*m);
+                }
+                n += 1;
+            }
+        }
+        PHASES
+            .iter()
+            .zip(sums)
+            .map(|(name, sum)| (name.to_string(), (sum / f64::from(n.max(1))).into()))
+            .collect::<serde_json::Map<_, _>>()
+            .into()
+    }
+    pub fn record_gpu(&mut self, millis: &[f32]) {
+        if self.gpu.len() < Self::LIMIT {
+            self.gpu.extend_from_slice(millis);
+        }
+    }
     pub fn reset(&mut self) {
         self.millis.clear();
+        self.cpu.clear();
+        self.gpu.clear();
+        self.phases.clear();
     }
     pub fn summary(&self) -> serde_json::Value {
         let mut sorted = self.millis.clone();
@@ -172,6 +239,15 @@ impl FrameStats {
             .map(|&m| f64::from(m))
             .sum::<f64>()
             / slowest as f64;
+        // Where the slowest 1% of frames by CPU time go.
+        let slow_phases = {
+            let mut cpu = self.cpu.clone();
+            cpu.sort_by(f32::total_cmp);
+            let p99 = cpu
+                .get(cpu.len().saturating_sub(cpu.len().div_ceil(100)))
+                .copied();
+            p99.map_or(serde_json::Value::Null, |p| self.phase_average(p))
+        };
         serde_json::json!({
             "frames": n,
             "seconds": total / 1000.0,
@@ -181,6 +257,10 @@ impl FrameStats {
             "p95_ms": percentile(0.95),
             "p99_ms": percentile(0.99),
             "max_ms": sorted[n - 1],
+            "cpu": percentiles(&self.cpu),
+            "gpu": percentiles(&self.gpu),
+            "phases_avg_ms": self.phase_average(0.0),
+            "slow_phases_avg_ms": slow_phases,
         })
     }
 }

crates/horizon-client/src/effects.rs

@@ -365,12 +365,7 @@ impl PlayerEffects {
             f *= 1.0 + (a + 1) as f32 * 0.2;
         }
         if let Some(a) = self.amplifier("mining_fatigue") {
-            f *= match a {
-                0 => 0.3,
-                1 => 0.09,
-                2 => 0.0027,
-                _ => 8.1e-4,
-            };
+            f *= horizon_core::jmath::pow(0.3, f64::from(a + 1)) as f32;
         }
         f
     }

crates/horizon-client/src/fast_hash.rs

@@ -0,0 +1,85 @@
+//! A fast, non-cryptographic hasher (the Fx hash used by rustc) for hot maps
+//! keyed by small integers, such as chunk coordinates. Iteration order of
+//! such maps carries no meaning: the default hasher's is random anyway.
+use std::hash::{BuildHasherDefault, Hasher};
+
+const SEED: u64 = 0xf135_7aea_2e62_a9c5;
+
+#[derive(Clone, Copy, Default)]
+pub struct FxHasher {
+    hash: u64,
+}
+impl FxHasher {
+    #[inline]
+    fn add(&mut self, word: u64) {
+        self.hash = self.hash.wrapping_add(word).wrapping_mul(SEED);
+    }
+}
+impl Hasher for FxHasher {
+    #[inline]
+    fn write(&mut self, bytes: &[u8]) {
+        let (words, rest) = bytes.as_chunks::<8>();
+        for word in words {
+            self.add(u64::from_le_bytes(*word));
+        }
+        if !rest.is_empty() {
+            let mut word = [0u8; 8];
+            word[..rest.len()].copy_from_slice(rest);
+            self.add(u64::from_le_bytes(word));
+        }
+    }
+    #[inline]
+    fn write_u8(&mut self, i: u8) {
+        self.add(u64::from(i));
+    }
+    #[inline]
+    fn write_u16(&mut self, i: u16) {
+        self.add(u64::from(i));
+    }
+    #[inline]
+    fn write_u32(&mut self, i: u32) {
+        self.add(u64::from(i));
+    }
+    #[inline]
+    fn write_u64(&mut self, i: u64) {
+        self.add(i);
+    }
+    #[inline]
+    fn write_usize(&mut self, i: usize) {
+        self.add(i as u64);
+    }
+    #[inline]
+    fn write_i32(&mut self, i: i32) {
+        self.add(u64::from(i as u32));
+    }
+    #[inline]
+    fn finish(&self) -> u64 {
+        // The multiply leaves the low bits weakest; hash tables use them.
+        self.hash.rotate_left(26)
+    }
+}
+pub type FxBuild = BuildHasherDefault<FxHasher>;
+pub type FxHashMap<K, V> = std::collections::HashMap<K, V, FxBuild>;
+pub type FxHashSet<K> = std::collections::HashSet<K, FxBuild>;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn nearby_chunks_spread_over_buckets() {
+        let mut map: FxHashMap<(i32, i32), i32> = FxHashMap::default();
+        for x in -40..40 {
+            for z in -40..40 {
+                map.insert((x, z), x * z);
+            }
+        }
+        assert_eq!(map.len(), 6400);
+        assert_eq!(map[&(-7, 13)], -91);
+        let mut low = std::collections::HashSet::new();
+        for x in 0..64 {
+            low.insert(std::hash::BuildHasher::hash_one(&FxBuild::default(), (x, 0)) & 63);
+        }
+        assert!(low.len() > 32, "low bits vary: {}", low.len());
+    }
+}

crates/horizon-client/src/first_person.rs

@@ -0,0 +1,601 @@
+//! The local player's hand: the arm swing (`LivingEntity.SwingState`,
+//! `getModifiedSwingDuration`), the first-person equip heights
+//! (`FirstPersonHandsAndItems.tick` and `itemUsed`), and the click handling
+//! that starts swings: `Minecraft.startAttack`, `continueAttack`,
+//! `startUseItem` and `handleKeybinds`' attack and use part, with
+//! `MultiPlayerGameMode`'s block breaking (`startDestroyBlock`,
+//! `continueDestroyBlock`, `stopDestroyBlock`).
+//!
+//! What those read and do in the world is behind [`HandWorld`].
+
+/// `InteractionHand`.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Hand {
+    Main,
+    Off,
+}
+impl Hand {
+    pub const BOTH: [Hand; 2] = [Hand::Main, Hand::Off];
+}
+
+/// `SwingAnimation`: its type (`SwingAnimationType` ordinal) and duration.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct SwingAnimation {
+    pub kind: u8,
+    pub duration: i32,
+}
+impl SwingAnimation {
+    /// `SwingAnimation.DEFAULT`: WHACK for 6 ticks.
+    pub const DEFAULT: SwingAnimation = SwingAnimation {
+        kind: 1,
+        duration: 6,
+    };
+}
+
+/// `LivingEntity.SwingDescription`.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct SwingDescription {
+    pub hand: Hand,
+    pub animation: SwingAnimation,
+    pub duration_ticks: i32,
+}
+
+/// `LivingEntity.SwingState`.
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+pub struct SwingState {
+    pub current: Option<SwingDescription>,
+    pub ticks: i32,
+    pub old_animation: f32,
+    pub animation: f32,
+}
+impl SwingState {
+    /// `startIfAble`: a swing restarts unless the current one is in its
+    /// first half (past its first tick).
+    pub fn start_if_able(&mut self, hand: Hand, animation: SwingAnimation, duration: i32) -> bool {
+        if let Some(c) = self.current
+            && self.ticks <= c.duration_ticks / 2
+            && self.ticks > 0
+        {
+            return false;
+        }
+        let swing = SwingDescription {
+            hand,
+            animation,
+            duration_ticks: duration,
+        };
+        if self.current != Some(swing) {
+            self.old_animation = 0.0;
+            self.animation = 0.0;
+        }
+        self.current = Some(swing);
+        self.ticks = 0;
+        true
+    }
+    /// `tick` (from `LivingEntity.baseTick`).
+    pub fn tick(&mut self) {
+        self.old_animation = self.animation;
+        if let Some(c) = self.current {
+            if c.duration_ticks > 0 {
+                self.animation = (self.ticks as f32 / c.duration_ticks as f32).min(1.0);
+            }
+            let ticks = self.ticks;
+            self.ticks += 1;
+            if ticks > c.duration_ticks {
+                self.current = None;
+                self.animation = 0.0;
+            }
+        } else {
+            self.animation = 0.0;
+        }
+    }
+    /// `getAnimation(partialTicks)`: a restarted swing keeps moving forward.
+    pub fn animation(&self, partial: f32) -> f32 {
+        if self.animation >= self.old_animation {
+            crate::camera::lerp(partial, self.old_animation, self.animation)
+        } else {
+            crate::camera::lerp(partial, self.old_animation, self.animation + 1.0)
+        }
+    }
+    pub fn swinging(&self) -> bool {
+        self.current.is_some()
+    }
+    /// The hand of the current swing (`state.attackHand`), main by default.
+    pub fn attack_hand(&self) -> Hand {
+        self.current.map_or(Hand::Main, |c| c.hand)
+    }
+}
+
+/// `LivingEntity.getModifiedSwingDuration`: `dig_speed` is
+/// `MobEffectUtil.getDigSpeedAmplification` while haste or conduit power is
+/// active, `fatigue` the mining fatigue amplifier.
+pub fn swing_duration(
+    animation: SwingAnimation,
+    dig_speed: Option<i32>,
+    fatigue: Option<i32>,
+) -> i32 {
+    let duration = animation.duration;
+    if let Some(amplification) = dig_speed {
+        duration - (1 + amplification)
+    } else if let Some(amplifier) = fatigue {
+        duration + (1 + amplifier) * 2
+    } else {
+        duration
+    }
+}
+
+/// `FirstPersonHandsAndItems`' equip heights.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct HandHeights {
+    pub main: f32,
+    pub old_main: f32,
+    pub off: f32,
+    pub old_off: f32,
+}
+impl Default for HandHeights {
+    fn default() -> Self {
+        HandHeights {
+            main: 0.0,
+            old_main: 0.0,
+            off: 0.0,
+            old_off: 0.0,
+        }
+    }
+}
+/// What `FirstPersonHandsAndItems.tick` decides about a hand's visible item.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub struct HandChange {
+    /// The visible item is not the hand's item after the instant replacement
+    /// (`mainHandItem != nextMainHand`): the hand lowers.
+    pub changed: bool,
+    /// The visible item becomes the hand's item this tick.
+    pub replace: bool,
+}
+impl HandHeights {
+    /// `FirstPersonHandsAndItems.tick`'s heights. `changed` says per hand
+    /// whether the visible item differs from the held one once
+    /// `shouldInstantlyReplaceVisibleItem` has run; `swap_scale` is
+    /// `getItemSwapScale(1.0F)`. Returns whether each hand's visible item
+    /// is replaced at the end.
+    pub fn tick(&mut self, hands_busy: bool, swap_scale: f32, changed: [bool; 2]) -> [bool; 2] {
+        self.old_main = self.main;
+        self.old_off = self.off;
+        if hands_busy {
+            self.main = (self.main - 0.4).clamp(0.0, 1.0);
+            self.off = (self.off - 0.4).clamp(0.0, 1.0);
+        } else {
+            let attack = swap_scale;
+            let main_target = if changed[0] {
+                0.0
+            } else {
+                attack * attack * attack
+            };
+            let off_target = if changed[1] { 0.0 } else { 1.0 };
+            self.main += (main_target - self.main).clamp(-0.4, 0.4);
+            self.off += (off_target - self.off).clamp(-0.4, 0.4);
+        }
+        [self.main < 0.1, self.off < 0.1]
+    }
+    /// `itemUsed`: the hand drops to the bottom and rises again.
+    pub fn item_used(&mut self, hand: Hand) {
+        match hand {
+            Hand::Main => self.main = 0.0,
+            Hand::Off => self.off = 0.0,
+        }
+    }
+    /// `Mth.lerp(partialTicks, oMainHandHeight, mainHandHeight)` and the
+    /// off hand's.
+    pub fn interpolated(&self, partial: f32) -> [f32; 2] {
+        [
+            crate::camera::lerp(partial, self.old_main, self.main),
+            crate::camera::lerp(partial, self.old_off, self.off),
+        ]
+    }
+}
+
+/// `HitResult` at the crosshair (`Minecraft.hitResult`).
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum Hit {
+    Miss,
+    Block { pos: [i32; 3], face: u8 },
+    Entity,
+}
+
+/// `InteractionResult` as `startUseItem` reads it.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum UseResult {
+    /// `Success` with its `SwingSource`: whether the client swings.
+    Success {
+        swing: bool,
+    },
+    Pass,
+    Fail,
+}
+
+/// What the click handling reads and does in the world.
+pub trait HandWorld {
+    fn hit(&mut self) -> Hit;
+    fn is_air(&mut self, pos: [i32; 3]) -> bool;
+    /// `MultiPlayerGameMode.localPlayerMode`.
+    fn creative(&self) -> bool;
+    fn spectator(&self) -> bool;
+    /// `Abilities.instabuild`.
+    fn instabuild(&self) -> bool;
+    fn hands_busy(&self) -> bool;
+    fn using_item(&self) -> bool;
+    /// `ItemStack.isItemEnabled` for the item in a hand.
+    fn item_enabled(&mut self, hand: Hand) -> bool;
+    fn held_empty(&mut self, hand: Hand) -> bool;
+    fn held_count(&mut self, hand: Hand) -> i32;
+    /// `Player.hasInfiniteMaterials`.
+    fn infinite_materials(&self) -> bool;
+    /// `Player.cannotAttackWithItem(heldItem, 0)`.
+    fn cannot_attack(&mut self) -> bool;
+    /// The main-hand item is a `PIERCING_WEAPON`.
+    fn piercing_weapon(&mut self) -> bool;
+    fn attack_animation(&mut self) -> SwingAnimation;
+    fn interact_animation(&mut self, hand: Hand) -> SwingAnimation;
+    /// `MultiPlayerGameMode.piercingAttack`.
+    fn piercing_attack(&mut self, animation: SwingAnimation);
+    /// `Player.attack` on the targeted entity when the item's attack range
+    /// allows it; false when out of range.
+    fn attack_entity(&mut self) -> bool;
+    /// `Player.blockActionRestricted` for the game mode.
+    fn block_action_restricted(&mut self, pos: [i32; 3]) -> bool;
+    /// `WorldBorder.isWithinBounds`.
+    fn within_border(&mut self, pos: [i32; 3]) -> bool;
+    /// `BlockState.attack` on the first hit of a break.
+    fn attack_block(&mut self, pos: [i32; 3]);
+    /// `BlockState.getDestroyProgress` for the player.
+    fn destroy_progress(&mut self, pos: [i32; 3]) -> f32;
+    /// `MultiPlayerGameMode.destroyBlock`.
+    fn destroy_block(&mut self, pos: [i32; 3]) -> bool;
+    /// A key for the main-hand stack, kept as `destroyingItem`.
+    fn main_hand_key(&mut self) -> String;
+    /// `ItemStack.isSameItemSameComponents(selected, destroyingItem)` for
+    /// the stack `main_hand_key` gave when the break started. Vanilla keeps
+    /// a reference to that stack, so it compares what it holds now.
+    fn same_destroying_item(&mut self, key: &str) -> bool {
+        self.main_hand_key() == key
+    }
+    /// Breaking progress shown (`destroyBlockProgress`), or cleared with `None`.
+    fn destroy_stage(&mut self, pos: [i32; 3], stage: Option<i32>);
+    /// `player.swing(hand, animation, false)`.
+    fn swing(&mut self, hand: Hand, animation: SwingAnimation);
+    /// `Player.resetAttackStrengthTicker`.
+    fn reset_attack_strength(&mut self);
+    /// The targeted entity's block position is inside the world border.
+    fn entity_within_border(&mut self) -> bool;
+    /// The use attempts of `startUseItem`: on the targeted entity (`None`
+    /// when it is out of interaction range), the targeted block, and the
+    /// item alone.
+    fn use_on_entity(&mut self, hand: Hand) -> Option<UseResult>;
+    fn use_on_block(&mut self, hand: Hand) -> UseResult;
+    fn use_item(&mut self, hand: Hand) -> UseResult;
+    /// `LocalPlayer.itemUsed`.
+    fn item_used(&mut self, hand: Hand);
+    /// `MultiPlayerGameMode.releaseUsingItem`.
+    fn release_using(&mut self);
+}
+
+/// `MultiPlayerGameMode`'s block breaking.
+#[derive(Clone, Debug, PartialEq)]
+pub struct Destroying {
+    pub delay: i32,
+    pub active: bool,
+    pub pos: [i32; 3],
+    pub face: u8,
+    pub item: String,
+    pub progress: f32,
+    pub ticks: f32,
+}
+impl Default for Destroying {
+    /// `destroyBlockPos` starts at (-1, -1, -1) and `destroyingItem` empty
+    /// (an empty key).
+    fn default() -> Self {
+        Destroying {
+            delay: 0,
+            active: false,
+            pos: [-1; 3],
+            face: 0,
+            item: String::new(),
+            progress: 0.0,
+            ticks: 0.0,
+        }
+    }
+}
+impl Destroying {
+    /// `getDestroyStage`.
+    pub fn stage(&self) -> i32 {
+        if self.progress > 0.0 {
+            (self.progress * 10.0) as i32
+        } else {
+            -1
+        }
+    }
+    fn same_target(&self, w: &mut impl HandWorld, pos: [i32; 3]) -> bool {
+        pos == self.pos && w.same_destroying_item(&self.item)
+    }
+    /// `startDestroyBlock`.
+    pub fn start(&mut self, w: &mut impl HandWorld, pos: [i32; 3], face: u8) -> bool {
+        if w.block_action_restricted(pos) || !w.within_border(pos) {
+            return false;
+        }
+        if w.instabuild() {
+            w.destroy_block(pos);
+            self.delay = 5;
+        } else if !self.active || !self.same_target(w, pos) {
+            let not_air = !w.is_air(pos);
+            if not_air && self.progress == 0.0 {
+                w.attack_block(pos);
+            }
+            if not_air && w.destroy_progress(pos) >= 1.0 {
+                w.destroy_block(pos);
+            } else {
+                self.active = true;
+                self.pos = pos;
+                self.face = face;
+                self.item = w.main_hand_key();
+                self.progress = 0.0;
+                self.ticks = 0.0;
+                w.destroy_stage(pos, Some(self.stage()));
+            }
+        }
+        true
+    }
+    /// `stopDestroyBlock`.
+    pub fn stop(&mut self, w: &mut impl HandWorld) {
+        if self.active {
+            self.active = false;
+            self.progress = 0.0;
+            w.destroy_stage(self.pos, None);
+            w.reset_attack_strength();
+        }
+    }
+    /// `continueDestroyBlock`: true while the hand keeps swinging.
+    pub fn continue_destroy(&mut self, w: &mut impl HandWorld, pos: [i32; 3], face: u8) -> bool {
+        if self.delay > 0 {
+            self.delay -= 1;
+            return true;
+        }
+        if w.instabuild() && w.within_border(pos) {
+            self.delay = 5;
+            w.destroy_block(pos);
+            return true;
+        }
+        if !self.same_target(w, pos) {
+            return self.start(w, pos, face);
+        }
+        if w.is_air(pos) {
+            self.active = false;
+            return false;
+        }
+        self.progress += w.destroy_progress(pos);
+        self.ticks += 1.0;
+        if self.progress >= 1.0 {
+            self.active = false;
+            w.destroy_block(pos);
+            self.progress = 0.0;
+            self.ticks = 0.0;
+            self.delay = 5;
+        } else if self.face != face {
+            self.face = face;
+        }
+        w.destroy_stage(self.pos, Some(self.stage()));
+        true
+    }
+}
+
+/// `Minecraft`'s attack and use handling.
+#[derive(Clone, Debug, Default, PartialEq)]
+pub struct Clicks {
+    pub miss_time: i32,
+    pub right_click_delay: i32,
+    pub destroying: Destroying,
+}
+impl Clicks {
+    /// `Minecraft.startAttack`: whether the click ended the attack (broke
+    /// the block outright).
+    pub fn start_attack(&mut self, w: &mut impl HandWorld) -> bool {
+        if self.miss_time > 0 || w.hands_busy() {
+            return false;
+        }
+        if w.spectator() {
+            return true;
+        }
+        if !w.item_enabled(Hand::Main) || w.cannot_attack() {
+            return false;
+        }
+        let animation = w.attack_animation();
+        if w.piercing_weapon() {
+            w.piercing_attack(animation);
+            return true;
+        }
+        let mut end = false;
+        let mut miss = false;
+        match w.hit() {
+            // MultiPlayerGameMode.attack.
+            Hit::Entity => {
+                if w.attack_entity() {
+                    w.reset_attack_strength();
+                    if w.instabuild() {
+                        self.destroying.delay = 5;
+                    }
+                }
+            }
+            Hit::Block { pos, face } if !w.is_air(pos) => {
+                self.destroying.start(w, pos, face);
+                end = w.is_air(pos);
+            }
+            Hit::Block { .. } | Hit::Miss => miss = true,
+        }
+        if miss {
+            if !w.creative() {
+                self.miss_time = 10;
+            }
+            w.reset_attack_strength();
+        }
+        w.swing(Hand::Main, animation);
+        end
+    }
+    /// `Minecraft.continueAttack`.
+    pub fn continue_attack(&mut self, w: &mut impl HandWorld, down: bool) {
+        if !down {
+            self.miss_time = 0;
+        }
+        if self.miss_time > 0 || w.using_item() || w.piercing_weapon() {
+            return;
+        }
+        let animation = w.attack_animation();
+        match w.hit() {
+            Hit::Block { pos, face } if down => {
+                if !w.is_air(pos) && self.destroying.continue_destroy(w, pos, face) {
+                    w.swing(Hand::Main, animation);
+                }
+            }
+            _ => self.destroying.stop(w),
+        }
+    }
+    /// `Minecraft.startUseItem`.
+    pub fn start_use_item(&mut self, w: &mut impl HandWorld) {
+        if self.destroying.active {
+            return;
+        }
+        self.right_click_delay = 4;
+        if w.hands_busy() {
+            return;
+        }
+        for hand in Hand::BOTH {
+            if !w.item_enabled(hand) {
+                return;
+            }
+            let animation = w.interact_animation(hand);
+            match w.hit() {
+                Hit::Entity => {
+                    if !w.entity_within_border() {
+                        return;
+                    }
+                    if let Some(UseResult::Success { swing }) = w.use_on_entity(hand) {
+                        if swing {
+                            w.swing(hand, animation);
+                        }
+                        return;
+                    }
+                }
+                Hit::Block { .. } => {
+                    let count = w.held_count(hand);
+                    match w.use_on_block(hand) {
+                        UseResult::Success { swing } => {
+                            if swing {
+                                w.swing(hand, animation);
+                                if !w.held_empty(hand)
+                                    && (w.held_count(hand) != count || w.infinite_materials())
+                                {
+                                    w.item_used(hand);
+                                }
+                            }
+                            return;
+                        }
+                        UseResult::Fail => return,
+                        UseResult::Pass => {}
+                    }
+                }
+                Hit::Miss => {}
+            }
+            if !w.held_empty(hand)
+                && let UseResult::Success { swing } = w.use_item(hand)
+            {
+                if swing {
+                    w.swing(hand, animation);
+                }
+                w.item_used(hand);
+                return;
+            }
+        }
+    }
+    /// The attack and use part of `Minecraft.tick`: `rightClickDelay`, the
+    /// clicks `handleKeybinds` consumes, held use and attack, then
+    /// `missTime`. `attack_down` is `keyAttack.isDown()` with no screen and
+    /// the mouse grabbed.
+    pub fn tick(
+        &mut self,
+        w: &mut impl HandWorld,
+        attack_clicks: u32,
+        use_clicks: u32,
+        attack_down: bool,
+        use_down: bool,
+    ) {
+        if self.right_click_delay > 0 {
+            self.right_click_delay -= 1;
+        }
+        let mut instant = false;
+        if w.using_item() {
+            if !use_down {
+                w.release_using();
+            }
+        } else {
+            for _ in 0..attack_clicks {
+                instant |= self.start_attack(w);
+            }
+            for _ in 0..use_clicks {
+                self.start_use_item(w);
+            }
+        }
+        if use_down && self.right_click_delay == 0 && !w.using_item() {
+            self.start_use_item(w);
+        }
+        self.continue_attack(w, !instant && attack_down);
+        if self.miss_time > 0 {
+            self.miss_time -= 1;
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn a_swing_lasts_its_duration_and_restarts_after_half() {
+        let mut s = SwingState::default();
+        assert!(s.start_if_able(Hand::Main, SwingAnimation::DEFAULT, 6));
+        let mut seen = Vec::new();
+        for _ in 0..9 {
+            s.tick();
+            seen.push(s.animation);
+        }
+        assert_eq!(
+            seen,
+            [
+                0.0,
+                1.0 / 6.0,
+                2.0 / 6.0,
+                0.5,
+                4.0 / 6.0,
+                5.0 / 6.0,
+                1.0,
+                0.0,
+                0.0
+            ]
+        );
+        assert!(!s.swinging());
+        s.start_if_able(Hand::Main, SwingAnimation::DEFAULT, 6);
+        s.tick();
+        s.tick();
+        assert!(!s.start_if_able(Hand::Main, SwingAnimation::DEFAULT, 6));
+        s.tick();
+        s.tick();
+        assert!(s.start_if_able(Hand::Main, SwingAnimation::DEFAULT, 6));
+        s.tick();
+        // Restarting the same swing wraps forward rather than snapping back.
+        assert_eq!(
+            s.animation(0.5),
+            (s.old_animation + s.animation + 1.0) / 2.0
+        );
+    }
+    #[test]
+    fn haste_shortens_and_fatigue_lengthens_swings() {
+        let d = SwingAnimation::DEFAULT;
+        assert_eq!(swing_duration(d, None, None), 6);
+        assert_eq!(swing_duration(d, Some(1), Some(0)), 4);
+        assert_eq!(swing_duration(d, None, Some(2)), 12);
+    }
+}

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;
@@ -39,6 +40,7 @@ mod game_mode;
 mod ghasts;
 mod golems;
 mod growth;
+mod hand;
 mod item_draw;
 mod jukebox;
 mod lan;
@@ -183,6 +185,11 @@ struct Options {
     no_pause: bool,
     /// Control socket path (`--control`), for `horizon-ctl`.
     control: Option<PathBuf>,
+    /// `HORIZON_SPIKES=MS`: print the timed spans of frames slower than MS.
+    spikes: Option<f32>,
+    /// Render into a texture instead of the window (`--offscreen`), so a
+    /// GPU the display cannot present from can still be benchmarked.
+    offscreen: bool,
     /// Multiplayer: `--server HOST[:PORT]` joins at start; `--name` is the offline player name.
     server: Option<String>,
     player_name: String,
@@ -218,6 +225,10 @@ impl Options {
             dimension: None,
             no_pause: false,
             control: None,
+            offscreen: false,
+            spikes: std::env::var("HORIZON_SPIKES")
+                .ok()
+                .and_then(|v| v.parse().ok()),
             server: None,
             player_name: std::env::var("HORIZON_PLAYER_NAME").unwrap_or_else(|_| "Player".into()),
             dedicated: None,
@@ -238,6 +249,7 @@ impl Options {
                 "--creative" => o.creative = true,
                 "--test-terrain" => o.test_terrain = true,
                 "--no-pause" => o.no_pause = true,
+                "--offscreen" => o.offscreen = true,
                 "--control" => o.control = Some(horizon_client::control::default_path()),
                 _ => {
                     let value = args
@@ -685,15 +697,25 @@ struct Game<'a> {
     orbs: Vec<ExperienceOrb>,
     xp_delay: u32,
     last_level_up: u64,
-    /// Arm swing: ticks into the 6-tick swing (None when idle), previous/current progress.
-    swing: Option<u32>,
-    swing_anim: (f32, f32),
-    /// Main-hand equip height (previous, current) and the item it shows.
-    hand_height: (f32, f32),
-    hand_item: Option<ItemStack>,
+    /// The arm swing (`LivingEntity.SwingState`) and how many swings started.
+    swing: horizon_client::first_person::SwingState,
+    swings_started: u32,
+    /// The first-person equip heights and the items the hands show (with
+    /// the slot each came from).
+    heights: horizon_client::first_person::HandHeights,
+    visible_hands: [(usize, Option<ItemStack>); 2],
+    /// `Minecraft`'s attack handling, attack clicks since the last tick and
+    /// the attack strength tickers the hand reads.
+    clicks: horizon_client::first_person::Clicks,
+    attack_clicks: u32,
+    hand_strength: horizon_client::attack_strength::AttackStrength,
     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,
@@ -776,6 +798,16 @@ struct Game<'a> {
     /// Control replies waiting for a rendered frame or a benchmark deadline.
     pending_screenshot: Option<std::sync::mpsc::Sender<String>>,
     pending_bench: Option<(Instant, std::sync::mpsc::Sender<String>)>,
+    /// Recent frame times for the performance overlay.
+    frame_graph: horizon_client::perf_overlay::FrameGraph,
+    /// Meshed sections waiting for an upload budget (Horizon settings).
+    pending_uploads: Vec<((i32, i32, i32), horizon_client::mesher::SectionMesh)>,
+    /// This frame's view frustum, for culling entities and block entities.
+    view_frustum: Option<horizon_client::gfx::Frustum>,
+    /// A scripted flight from the control socket (`fly`).
+    flight: Option<control::Flight>,
+    /// The overworld's last `sky_darken` and its inputs (time, rain, thunder).
+    sky_darken_memo: std::cell::Cell<Option<((i64, u32, u32), i32)>>,
     persist: persist::EntityMemory,
     /// Connected to a server: the world comes from the network (game/remote.rs).
     remote: Option<remote::Remote>,
@@ -1218,7 +1250,14 @@ impl Game<'_> {
     }
     fn tick_items(&mut self) {
         let mut items = std::mem::take(&mut self.dropped);
-        items.retain_mut(|item| item.tick(&self.world, &self.res.facts, self.collision));
+        // ServerLevel.tick: only entities in entity-ticking chunks tick.
+        let ticking = self.entity_ticking_area();
+        items.retain_mut(|item| {
+            !ticking(
+                item.position.x.floor() as i32,
+                item.position.z.floor() as i32,
+            ) || item.tick(&self.world, &self.res.facts, self.collision)
+        });
         let Some(p) = self.player.as_ref() else {
             self.dropped = items;
             return;
@@ -2781,67 +2820,69 @@ impl Game<'_> {
     /// What the tick runs after the local player's own update: effects, the
     /// world's entities and blocks, and the network hub.
     fn tick_world(&mut self, running: bool) -> Result<()> {
-        self.tick_effects();
-        self.tick_burning();
-        self.tick_using();
-        self.tick_hud();
+        horizon_client::spans::time("tick_effects", || self.tick_effects());
+        horizon_client::spans::time("tick_burning", || self.tick_burning());
+        horizon_client::spans::time("tick_using", || self.tick_using());
+        horizon_client::spans::time("tick_hud", || self.tick_hud());
         // The player's digging comes in with its packets, before the level
         // ticks; ServerLevel.tick then runs the scheduled and random block
         // ticks before any entity, so what they drop or spawn (dispensed
         // items, popped crops) moves on the tick it appears, as in vanilla.
-        self.tick_mining()?;
-        self.postprocess_chunks()?;
+        horizon_client::spans::time("tick_local_hand", || self.tick_local_hand())?;
+        horizon_client::spans::time("postprocess_chunks", || self.postprocess_chunks())?;
         if running {
-            self.tick_blocks()?;
+            horizon_client::spans::time("tick_blocks", || self.tick_blocks())?;
         }
         if running {
-            self.tick_paintings();
-            self.tick_item_frames();
-            self.tick_armor_stands();
-            self.tick_boats();
-            self.tick_carts();
-            self.tick_thunder();
-            self.tick_lecterns();
-            self.tick_maps();
-            self.tick_bolts();
-            self.tick_fishing();
-            self.tick_tridents();
-            self.tick_rockets();
+            horizon_client::spans::time("tick_paintings", || self.tick_paintings());
+            horizon_client::spans::time("tick_item_frames", || self.tick_item_frames());
+            horizon_client::spans::time("tick_armor_stands", || self.tick_armor_stands());
+            horizon_client::spans::time("tick_boats", || self.tick_boats());
+            horizon_client::spans::time("tick_carts", || self.tick_carts());
+            horizon_client::spans::time("tick_thunder", || self.tick_thunder());
+            horizon_client::spans::time("tick_lecterns", || self.tick_lecterns());
+            horizon_client::spans::time("tick_maps", || self.tick_maps());
+            horizon_client::spans::time("tick_bolts", || self.tick_bolts());
+            horizon_client::spans::time("tick_fishing", || self.tick_fishing());
+            horizon_client::spans::time("tick_tridents", || self.tick_tridents());
+            horizon_client::spans::time("tick_rockets", || self.tick_rockets());
         }
         if running {
-            self.tick_items();
+            horizon_client::spans::time("tick_items", || self.tick_items());
         }
-        self.spawn_loaded_entities();
+        horizon_client::spans::time("spawn_loaded_entities", || self.spawn_loaded_entities());
         if running {
-            self.tick_mobs()?;
-            self.recheck_golem_openers();
-            self.tick_experience();
+            horizon_client::spans::time("tick_mobs", || self.tick_mobs())?;
+            horizon_client::spans::time("recheck_golem_openers", || self.recheck_golem_openers());
+            horizon_client::spans::time("tick_experience", || self.tick_experience());
         }
-        self.tick_lan();
-        self.tick_hand();
-        self.tick_sleep();
-        self.tick_portal()?;
+        horizon_client::spans::time("tick_lan", || self.tick_lan());
+        horizon_client::spans::time("tick_hand", || self.tick_hand());
+        horizon_client::spans::time("tick_sleep", || self.tick_sleep());
+        horizon_client::spans::time("tick_portal", || self.tick_portal())?;
         if running {
-            self.tick_end()?;
+            horizon_client::spans::time("tick_end", || self.tick_end())?;
         }
         if running {
-            self.tick_falling()?;
-            self.tick_tnt()?;
+            horizon_client::spans::time("tick_falling", || self.tick_falling())?;
+            horizon_client::spans::time("tick_tnt", || self.tick_tnt())?;
         }
         if running {
-            self.tick_block_entities()?;
-            self.tick_sculk_entities();
-            self.tick_sculk_blocks()?;
-            self.tick_brewing_stands()?;
+            horizon_client::spans::time("tick_block_entities", || self.tick_block_entities())?;
+            horizon_client::spans::time("tick_sculk_entities", || self.tick_sculk_entities());
+            horizon_client::spans::time("tick_sculk_blocks", || self.tick_sculk_blocks())?;
+            horizon_client::spans::time("tick_brewing_stands", || self.tick_brewing_stands())?;
         }
         if running {
             // ClientLevel.tickBlockEntities (not while paused or frozen):
             // chest lids, books, shulker boxes, bells, conduits, heads.
-            self.tick_block_entity_anims();
-            self.tick_particles();
+            horizon_client::spans::time("tick_block_entity_anims", || {
+                self.tick_block_entity_anims()
+            });
+            horizon_client::spans::time("tick_particles", || self.tick_particles());
         }
         if self.right && self.use_delay == 0 && self.screen == Screen::Playing {
-            self.use_item()?;
+            self.use_with_hand()?;
             self.use_delay = 4;
         }
         Ok(())
@@ -2962,6 +3003,12 @@ impl Game<'_> {
         hud_layout::paint(batch, &self.res.atlas, &draws);
     }
     fn hud(&mut self, size: [u32; 2]) -> HudBatch {
+        let mut batch = self.hud_layers(size);
+        self.frame_graph
+            .draw(self.settings.horizon.overlay, &mut batch, &self.res.atlas);
+        batch
+    }
+    fn hud_layers(&mut self, size: [u32; 2]) -> HudBatch {
         let mut batch = HudBatch::new(size);
         let (w, h) = (batch.width, batch.height);
         if self.screen == Screen::Options {
@@ -2969,7 +3016,15 @@ 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;
@@ -2994,7 +3049,8 @@ 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.
@@ -4365,9 +4421,34 @@ impl Game<'_> {
                 banner: &|p| self.banner_layers_at(p),
                 glyph: &|c| self.res.atlas.glyph_cell(c),
             };
+            // Block entities outside the view frustum are skipped (with a
+            // block of margin for models larger than their block).
+            let view = self.view_frustum;
+            // Beams and structure outlines reach far outside their block
+            // (BlockEntityRenderer.shouldRenderOffScreen): never culled.
+            let off_screen = |state: u32| {
+                let name = &*self.res.facts.get(BlockStateId(state)).name;
+                matches!(
+                    name,
+                    "minecraft:beacon"
+                        | "minecraft:end_gateway"
+                        | "minecraft:structure_block"
+                        | "minecraft:test_instance_block"
+                )
+            };
+            let visible = r.block_entities().filter(|(p, state)| {
+                off_screen(*state)
+                    || view.is_none_or(|v| {
+                        let o =
+                            (glam::DVec3::new(f64::from(p[0]), f64::from(p[1]), f64::from(p[2]))
+                                - camera)
+                                .as_vec3();
+                        v.intersects(o - glam::Vec3::ONE, o + glam::Vec3::splat(2.0))
+                    })
+            });
             self.res
                 .block_entity_render
-                .render(&scene, r.block_entities(), &mut out);
+                .render(&scene, visible, &mut out);
         }
         // Experience orbs (ExperienceOrbRenderer): pulsing billboards from a 4x4 icon sheet.
         if let Some(r) = self
@@ -4601,11 +4682,20 @@ impl Game<'_> {
                 .sample(self.world.day_time, None, None);
             return (15.0 - 15.0 * sky.sky_light_level).round() as i32;
         }
-        let mut sky = self.res.environment.sample(self.world.day_time, None, None);
         let (rain, thunder) = self.world.weather.levels(1.0);
+        // Sampled once per (time, weather): every mob asks each tick.
+        let key = (self.world.day_time, rain.to_bits(), thunder.to_bits());
+        if let Some((k, darken)) = self.sky_darken_memo.get()
+            && k == key
+        {
+            return darken;
+        }
+        let mut sky = self.res.environment.sample(self.world.day_time, None, None);
         horizon_client::environment::apply_weather(&mut sky, rain, thunder);
         // Level.updateSkyBrightness: darkening from the sky light level.
-        (15.0 - 15.0 * sky.sky_light_level).round() as i32
+        let darken = (15.0 - 15.0 * sky.sky_light_level).round() as i32;
+        self.sky_darken_memo.set(Some((key, darken)));
+        darken
     }
     fn mob_hit(&self) -> Option<(usize, f64)> {
         let eye = self.eye_position()?;
@@ -6374,38 +6464,6 @@ impl Game<'_> {
         }
         self.damage_held(1);
     }
-    /// LivingEntity.swing: restart the 6-tick arm swing.
-    fn swing_arm(&mut self) {
-        if self.swing.is_none_or(|t| t >= 3) {
-            self.swing = Some(0);
-        }
-    }
-    /// LivingEntity.updateSwingTime and ItemInHandRenderer.tick (equip height).
-    fn tick_hand(&mut self) {
-        self.swing_anim.0 = self.swing_anim.1;
-        if let Some(t) = self.swing {
-            let t = t + 1;
-            if t >= 6 {
-                self.swing = None;
-                self.swing_anim.1 = 0.0;
-            } else {
-                self.swing = Some(t);
-                self.swing_anim.1 = t as f32 / 6.0;
-            }
-        }
-        self.hand_height.0 = self.hand_height.1;
-        let held = self.inventory[self.selected].clone();
-        let same = match (&held, &self.hand_item) {
-            (Some(a), Some(b)) => a.item == b.item,
-            (None, None) => true,
-            _ => false,
-        };
-        let target = if same { 1.0 } else { 0.0 };
-        self.hand_height.1 += (target - self.hand_height.1).clamp(-0.4, 0.4);
-        if self.hand_height.1 < 0.1 {
-            self.hand_item = held;
-        }
-    }
     /// FirstPersonHandsAndItemsRenderer: the right arm or held item in view
     /// space, converted to camera-relative world space.
     fn hand_geometry(&mut self, alpha: f64) -> Vec<Vertex> {
@@ -6423,14 +6481,15 @@ impl Game<'_> {
             return out;
         }
         let a = alpha as f32;
-        let attack = self.swing_anim.0 + (self.swing_anim.1 - self.swing_anim.0) * a;
-        let attack = if self.swing.is_none() && self.swing_anim.1 == 0.0 {
-            0.0
+        // FirstPersonHandsAndItemsRenderer: the swing of the hand that
+        // swings, and its inverse arm height (the swap scale is 1 for every
+        // item but spears).
+        let attack = if self.swing.attack_hand() == horizon_client::first_person::Hand::Main {
+            self.swing.animation(a)
         } else {
-            attack
+            0.0
         };
-        let height = self.hand_height.0 + (self.hand_height.1 - self.hand_height.0) * a;
-        let inverse_height = 1.0 - height;
+        let inverse_height = 1.0 - self.heights.interpolated(a)[0];
         let (yaw, pitch) = (self.yaw.to_radians(), self.pitch.to_radians());
         let forward = glam::Vec3::new(
             -yaw.sin() * pitch.cos(),
@@ -6451,7 +6510,8 @@ impl Game<'_> {
         if self.held_map_geometry(to_world, attack, inverse_height, packed, &mut out) {
             return out;
         }
-        match self.hand_item.clone() {
+        let [main_item, _] = self.visible_hand_items();
+        match main_item {
             None => {
                 let Some(arm) = self.res.player_arm.clone() else {
                     return out;
@@ -7150,7 +7210,13 @@ 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
@@ -7217,14 +7283,39 @@ impl Game<'_> {
         } else {
             Vec::new()
         };
-        let mut hud = self.hud(size);
+        let mut hud = horizon_client::spans::time("hud", || self.hud(size));
         // Map textures changed since the last drawn frame (game/maps.rs).
         hud.patches.append(&mut self.map_patches);
         let title = self.title.is_some();
+        let (yaw, pitch) = if live {
+            (view_yaw, view_pitch)
+        } else if title {
+            // PanoramaRenderer: the title cube spins at 0.1 degrees per tick, pitched 10 degrees.
+            (-(self.started.elapsed().as_secs_f32() * 2.0) % 360.0, 10.0)
+        } else {
+            (view_yaw, view_pitch)
+        };
+        let fov_degrees = if live {
+            72.0
+        } else if title {
+            85.0
+        } else {
+            self.fov_degrees(alpha as f32, camera.to_array())
+        };
+        let bob = if title {
+            glam::Mat4::IDENTITY
+        } else {
+            self.bob_matrix(alpha as f32)
+        };
+        let distance = (self.streaming.radius * 16) as f32;
+        self.view_frustum = self
+            .renderer
+            .as_ref()
+            .map(|r| r.camera_frustum(fov_degrees, yaw, pitch, bob, distance));
         let mut entities = if title {
             Vec::new()
         } else {
-            self.entity_geometry(camera, alpha)
+            horizon_client::spans::time("entity_geometry", || self.entity_geometry(camera, alpha))
         };
         let mut additive = Vec::new();
         if !title {
@@ -7236,7 +7327,7 @@ 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()
@@ -7262,16 +7353,16 @@ impl Game<'_> {
         if !title {
             self.end_geometry(camera, &mut entities);
         }
-        if !title && self.dim == Dim::Overworld {
-            self.cloud_geometry(&sky, camera, alpha, &mut entities);
-            self.weather_geometry(camera, alpha, &mut entities);
+        if (!title || live) && self.dim == Dim::Overworld {
+            horizon_client::spans::time("clouds", || {
+                self.cloud_geometry(&sky, camera, alpha, &mut entities)
+            });
+            if self.settings.horizon.weather {
+                horizon_client::spans::time("weather", || {
+                    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 {
-            (-(self.started.elapsed().as_secs_f32() * 2.0) % 360.0, 10.0)
-        } else {
-            (view_yaw, view_pitch)
-        };
         let water_fog = {
             let c = info.water_fog;
             [
@@ -7287,38 +7378,44 @@ impl Game<'_> {
             camera,
             yaw,
             pitch,
-            fov_degrees: if title {
-                85.0
-            } else {
-                self.fov_degrees(alpha as f32, camera.to_array())
-            },
-            bob: if title {
-                glam::Mat4::IDENTITY
-            } else {
-                self.bob_matrix(alpha as f32)
-            },
+            fov_degrees,
+            bob,
             sky,
-            distance: (self.streaming.radius * 16) as f32,
+            distance,
             underwater,
-            title,
-            skybox: self.dim == Dim::Overworld,
-            end_sky: self.dim == Dim::End,
+            title: title && !live,
+            skybox: self.dim == Dim::Overworld && self.settings.horizon.sky,
+            end_sky: self.dim == Dim::End && self.settings.horizon.sky,
             environment_fog: (self.dim == Dim::Nether).then_some((sky.fog_start, sky.fog_end)),
             // The camera inside an opaque block sees nothing through it: disable.
-            cave_culling: !self
-                .res
-                .facts
-                .get(self.world.block(block[0], block[1], block[2]))
-                .solid_render,
+            cave_culling: self.settings.horizon.cave_culling
+                && !self
+                    .res
+                    .facts
+                    .get(self.world.block(block[0], block[1], block[2]))
+                    .solid_render,
             water_fog,
-            fog: Some(self.frame_fog(camera, &sky, biome)),
+            fog: Some({
+                let mut fog = self.frame_fog(camera, &sky, biome);
+                // Horizon's fog setting: no distance fog (fluids keep theirs).
+                if !self.settings.horizon.fog && !underwater && fog.environmental_end >= distance {
+                    (fog.render_distance_start, fog.render_distance_end) = (1e9, 2e9);
+                    (fog.environmental_start, fog.environmental_end) = (1e9, 2e9);
+                }
+                fog
+            }),
             dark_disc: self.dark_disc(camera),
             outline,
             hud: &hud,
             entities: &entities,
             additive: &additive,
-            celestial: &celestial,
+            celestial: if self.settings.horizon.sky || title {
+                &celestial
+            } else {
+                &[]
+            },
             hand: &hand,
+            hand_fov_degrees: self.hud_fov_degrees(alpha as f32, camera.to_array()),
             screen: &screen,
             border,
             game_time: self.world.game_time as f32,
@@ -7334,8 +7431,16 @@ 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)
+        let renderer = self.renderer.as_mut().ok_or("renderer")?;
+        horizon_client::spans::time("renderer", || renderer.render(&frame))
     }
     /// `LevelExtractor` / `LevelRenderer`: the world border wall this frame.
     fn border_draw(
@@ -7491,22 +7596,20 @@ impl Game<'_> {
         }
         match button {
             MouseButton::Left => {
-                if pressed && self.attack() {
-                    return Ok(());
+                // KeyMapping.click: Minecraft.tick starts the attack.
+                if pressed {
+                    self.attack_clicks += 1;
                 }
                 self.toggles
                     .button(2, pressed, false, self.settings.toggle_attack);
                 self.left = self.toggles.is_down(2);
-                if pressed {
-                    self.destroy_delay = 0;
-                }
             }
             MouseButton::Right => {
                 self.toggles
                     .button(3, pressed, false, self.settings.toggle_use);
                 self.right = self.toggles.is_down(3);
                 if pressed {
-                    self.use_item()?;
+                    self.use_with_hand()?;
                     self.use_delay = 4;
                 }
             }
@@ -7538,32 +7641,79 @@ impl Game<'_> {
                 (p.position.z.floor() as i32) >> 4,
             );
         }
-        let (uploads, unloaded) = self.streaming.update(&mut self.world);
+        let (uploads, unloaded) =
+            horizon_client::spans::time("streaming", || self.streaming.update(&mut self.world));
         let dirty: Vec<_> = unloaded
             .iter()
             .filter(|c| self.world.modified.remove(&(c.x, c.z)))
             .cloned()
             .collect();
-        let modified: Vec<_> = dirty.iter().map(|c| self.with_entities(c)).collect();
-        self.unload_entities(&unloaded);
-        for c in &unloaded {
+        let modified: Vec<_> = horizon_client::spans::time("with_entities", || {
+            dirty.iter().map(|c| self.with_entities(c)).collect()
+        });
+        horizon_client::spans::time("unload_entities", || self.unload_entities(&unloaded));
+        if !unloaded.is_empty() {
+            let gone: horizon_client::fast_hash::FxHashSet<(i32, i32)> =
+                unloaded.iter().map(|c| (c.x, c.z)).collect();
             self.world
                 .block_entities
-                .retain(|p, _| !(p.0 >> 4 == c.x && p.2 >> 4 == c.z));
+                .retain(|p, _| !gone.contains(&(p.0 >> 4, p.2 >> 4)));
             self.world
                 .block_names
-                .retain(|p, _| !(p.0 >> 4 == c.x && p.2 >> 4 == c.z));
+                .retain(|p, _| !gone.contains(&(p.0 >> 4, p.2 >> 4)));
         }
         if !modified.is_empty()
-            && let Err(e) = self
-                .save
-                .save(&modified, self.res.assets.registry, &self.res.biomes)
+            && let Err(e) = horizon_client::spans::time("save_chunks", || {
+                self.save
+                    .save_later(&modified, self.res.assets.registry, &self.res.biomes)
+            })
         {
             eprintln!("Horizon: failed to save unloaded chunks: {e}");
         }
         if let Some(renderer) = self.renderer.as_mut() {
-            for (key, mesh) in uploads {
-                renderer.upload(key, &mesh);
+            let g = &self.settings.horizon;
+            let budgeted = g.chunk_updates > 0 || g.upload_budget_kib > 0;
+            if !budgeted && self.pending_uploads.is_empty() {
+                horizon_client::spans::time("upload", || {
+                    for (key, mesh) in uploads {
+                        renderer.upload(key, &mesh);
+                    }
+                });
+            } else {
+                // Horizon's chunk-update and upload budgets: the nearest
+                // sections go first, the rest wait for later frames; a newer
+                // mesh of a waiting section replaces it.
+                let pending = &mut self.pending_uploads;
+                let fresh: horizon_client::fast_hash::FxHashSet<(i32, i32, i32)> =
+                    uploads.iter().map(|(k, _)| *k).collect();
+                let gone: horizon_client::fast_hash::FxHashSet<(i32, i32)> =
+                    unloaded.iter().map(|c| (c.x, c.z)).collect();
+                pending.retain(|(k, _)| !fresh.contains(k) && !gone.contains(&(k.0, k.2)));
+                pending.extend(uploads);
+                let centre = self.streaming.center;
+                let far = |k: &(i32, i32, i32)| (k.0 - centre.0).pow(2) + (k.2 - centre.1).pow(2);
+                pending.sort_unstable_by_key(|(k, _)| std::cmp::Reverse(far(k)));
+                let (limit, budget) = if budgeted {
+                    (
+                        g.chunk_updates as usize,
+                        u64::from(g.upload_budget_kib) * 1024,
+                    )
+                } else {
+                    (0, 0)
+                };
+                let (mut count, mut bytes) = (0, 0u64);
+                while let Some((_, mesh)) = pending.last() {
+                    let size = ((mesh.solid.len() + mesh.translucent.len()) * 32) as u64;
+                    if (limit > 0 && count >= limit)
+                        || (budget > 0 && bytes > 0 && bytes + size > budget)
+                    {
+                        break;
+                    }
+                    let (key, mesh) = pending.pop().expect("checked above");
+                    renderer.upload(key, &mesh);
+                    count += 1;
+                    bytes += size;
+                }
             }
             for c in unloaded {
                 for sy in 0..(HEIGHT / 16) {
@@ -7593,6 +7743,7 @@ impl ApplicationHandler for Game<'_> {
         let assets = &self.res.assets;
         match pollster::block_on(Renderer::new(
             window.clone(),
+            self.options.offscreen,
             &assets.pixels,
             assets.sprite_size,
             assets.texture_layers,
@@ -7627,6 +7778,15 @@ 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 => {
@@ -7752,9 +7912,14 @@ 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(),
@@ -7920,6 +8085,7 @@ 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(),
@@ -8001,18 +8167,26 @@ impl ApplicationHandler for Game<'_> {
                     self.pitch = (self.pitch
                         + (turn(KeyCode::ArrowDown) - turn(KeyCode::ArrowUp)) * 90.0 * secs)
                         .clamp(-90.0, 90.0);
-                    if self.title.is_none() {
-                        self.update_world();
-                        self.spawn_player()?;
+                    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() {
+                        horizon_client::spans::time("update_world", || self.update_world());
+                        horizon_client::spans::time("spawn_player", || self.spawn_player())?;
+                    }
+                    let updated = Instant::now();
                     self.track_toggle_screens();
                     let steps = self.clock.advance(elapsed);
                     for _ in 0..steps {
                         let started = Instant::now();
                         if self.title.is_none() && !self.pause {
-                            self.tick()?;
+                            horizon_client::spans::time("tick", || self.tick())?;
                             self.tick_ambience();
                             self.tick_fov();
+                        } else if self.title.is_some() {
+                            self.tick_backdrop();
                         }
                         self.tick_music();
                         self.tick_sound_engine();
@@ -8022,7 +8196,48 @@ impl ApplicationHandler for Game<'_> {
                         }
                     }
                     self.apply_mouse_look();
+                    self.advance_flight();
+                    let ticked = Instant::now();
                     let rendered = self.render()?;
+                    if let Some(threshold) = self.options.spikes
+                        && let Some(r) = self.renderer.as_ref()
+                    {
+                        let cpu = now.elapsed().saturating_sub(r.last_wait).as_secs_f32() * 1000.0;
+                        let spans = horizon_client::spans::take();
+                        if cpu > threshold {
+                            let list: Vec<String> = spans
+                                .iter()
+                                .filter(|(_, ms)| *ms >= 0.5)
+                                .map(|(n, ms)| format!("{n} {ms:.1}"))
+                                .collect();
+                            eprintln!(
+                                "Horizon: slow frame {cpu:.1} ms ({} ticks): {}",
+                                steps,
+                                list.join(", ")
+                            );
+                        }
+                    }
+                    if let Some(r) = self.renderer.as_mut() {
+                        let cpu = now.elapsed().saturating_sub(r.last_wait);
+                        if rendered {
+                            let ms = |d: Duration| d.as_secs_f32() * 1000.0;
+                            self.frame_graph.record(
+                                ms(elapsed),
+                                ms(cpu),
+                                r.gpu_times.last().copied(),
+                            );
+                            self.frame_stats.record_cpu(ms(cpu));
+                            let render = r.last_encode;
+                            self.frame_stats.record_phases([
+                                ms(updated - now),
+                                ms(ticked - updated),
+                                ms(ticked.elapsed().saturating_sub(r.last_wait + render)),
+                                ms(render),
+                            ]);
+                        }
+                        self.frame_stats.record_gpu(&r.gpu_times);
+                        r.gpu_times.clear();
+                    }
                     self.limit_frame();
                     self.pause = self.pauses_game();
                     self.clock.end_frame(self.pause);
@@ -8103,6 +8318,7 @@ pub fn run() -> Result<()> {
         return Ok(());
     }
     let started = Instant::now();
+    horizon_client::spans::enable(options.spikes.is_some());
     let vanilla_root = options.resources.clone();
     let early_settings = Settings::load(&std::env::current_dir()?.join("options.txt"));
     options.resources = packs::startup_root(&vanilla_root, &early_settings.resource_packs);
@@ -8151,10 +8367,7 @@ pub fn run() -> Result<()> {
         biomes: biomes.clone(),
         light,
     });
-    let threads = std::thread::available_parallelism()
-        .map_or(2, |n| n.get())
-        .saturating_sub(1)
-        .max(1);
+    let threads = early_settings.horizon.worker_threads();
     eprintln!(
         "Horizon: resources loaded in {:.1}s; {} block states, {} items, {} biomes; {} worker threads",
         started.elapsed().as_secs_f32(),
@@ -8246,6 +8459,14 @@ 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;
     }
@@ -8357,12 +8578,17 @@ pub fn run() -> Result<()> {
         orbs: Vec::new(),
         xp_delay: 0,
         last_level_up: 0,
-        swing: None,
-        swing_anim: (0.0, 0.0),
-        hand_height: (1.0, 1.0),
-        hand_item: None,
+        swing: Default::default(),
+        swings_started: 0,
+        heights: Default::default(),
+        visible_hands: [(0, None), (0, None)],
+        clicks: Default::default(),
+        attack_clicks: 0,
+        hand_strength: Default::default(),
         settings,
         options_from_title: false,
+        backdrop: Default::default(),
+        pause_since: None,
         dragging: false,
         avatar: Default::default(),
         flash: 0,
@@ -8428,6 +8654,11 @@ pub fn run() -> Result<()> {
         frame_stats: Default::default(),
         pending_screenshot: None,
         pending_bench: None,
+        flight: None,
+        view_frustum: None,
+        pending_uploads: Vec::new(),
+        frame_graph: Default::default(),
+        sky_darken_memo: Default::default(),
         persist: Default::default(),
         remote: None,
         lan: None,
@@ -8493,7 +8724,16 @@ 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/armor_stands.rs

@@ -183,7 +183,7 @@ impl Game<'_> {
         true
     }
     /// The armor stand under the crosshair, its distance and the hit point.
-    fn armor_stand_hit(&self) -> Option<(usize, f64, [f64; 3])> {
+    pub(super) fn armor_stand_hit(&self) -> Option<(usize, f64, [f64; 3])> {
         let eye = self.eye_position()?;
         let dir = view_vector(self.yaw, self.pitch);
         let reach: f64 = if self.creative { 5.0 } else { 3.0 };

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/boats.rs

@@ -597,7 +597,7 @@ impl Game<'_> {
         self.swing_arm();
         true
     }
-    fn boat_hit(&self) -> Option<(usize, f64)> {
+    pub(super) fn boat_hit(&self) -> Option<(usize, f64)> {
         let eye = self.eye_position()?;
         let dir = view_vector(self.yaw, self.pitch);
         let reach: f64 = if self.creative { 5.0 } else { 3.0 };

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

@@ -29,9 +29,10 @@ const HELP: &[&str] = &[
     "chat TEXT                      send a chat line or /command as if typed",
     "type TEXT                      type into the open chat box (key enter tap sends)",
     "chat-log [N]                   the newest N chat messages (default 10)",
-    "options [PAGE]                 open the options (video sound controls keybinds mouse chat accessibility language font packs)",
+    "options [PAGE]                 open the options (video sound controls keybinds mouse chat accessibility language font packs graphics graphics-advanced)",
     "stats [reset]                  frame-time summary since the last reset",
     "bench SECONDS                  reset stats, wait, then reply with the summary",
+    "fly X1 Y1 Z1 X2 Y2 Z2 SECONDS [PITCH]  fly the camera along a line at constant speed, then reply with the frame summary",
     "open WORLD [SEED] [creative]   open or create a world from the title screen",
     "save                           save the world",
     "save-all                       save the world, rewriting every resident chunk",
@@ -42,7 +43,42 @@ const HELP: &[&str] = &[
     "quit                           save and exit",
 ];
 
+/// A straight camera path at constant speed, for repeatable benchmarks: the
+/// player is placed on it every frame, facing along it.
+pub struct Flight {
+    from: Vec3,
+    to: Vec3,
+    pitch: f32,
+    started: Instant,
+    seconds: f64,
+    reply: Sender<String>,
+}
+
 impl Game<'_> {
+    /// Move the camera along the running flight; reply when it ends.
+    pub(super) fn advance_flight(&mut self) {
+        let Some(flight) = &self.flight else { return };
+        let t = (flight.started.elapsed().as_secs_f64() / flight.seconds).min(1.0);
+        let (a, b) = (flight.from, flight.to);
+        let d = [b.x - a.x, b.y - a.y, b.z - a.z];
+        let at = Vec3::new(a.x + d[0] * t, a.y + d[1] * t, a.z + d[2] * t);
+        // Minecraft yaw: 0 faces +Z, 90 faces -X.
+        self.yaw = (-d[0]).atan2(d[2]).to_degrees() as f32;
+        self.pitch = flight.pitch;
+        if let Some(player) = self.player.as_mut() {
+            player.position = at;
+            player.velocity = Vec3::new(0.0, 0.0, 0.0);
+            player.fall_distance = 0.0;
+            // Stay where the flight ends (creative flight).
+            player.flying = true;
+            self.previous_position = at;
+        }
+        if t >= 1.0
+            && let Some(flight) = self.flight.take()
+        {
+            let _ = flight.reply.send(self.frame_stats.summary().to_string());
+        }
+    }
     pub(super) fn poll_control(&mut self, event_loop: &ActiveEventLoop) {
         if let Some((deadline, reply)) = self.pending_bench.take() {
             if Instant::now() >= deadline {
@@ -325,6 +361,8 @@ impl Game<'_> {
                     "language" => Page::Language,
                     "font" => Page::Font,
                     "packs" => Page::Packs,
+                    "graphics" => Page::Graphics,
+                    "graphics-advanced" => Page::GraphicsAdvanced,
                     other => return Err(format!("unknown options page {other}").into()),
                 };
                 if self.screen == Screen::Playing && self.title.is_none() {
@@ -357,6 +395,24 @@ impl Game<'_> {
                 ));
                 Ok(None)
             }
+            "fly" => {
+                self.require_world()?;
+                if self.flight.is_some() || self.pending_bench.is_some() {
+                    return Err("a benchmark is already running".into());
+                }
+                let n = |i: usize| -> Result<f64> { Ok(arg(i)?.parse()?) };
+                let pitch = words.get(8).map_or(Ok(10.0), |p| p.parse::<f32>())?;
+                self.frame_stats.reset();
+                self.flight = Some(Flight {
+                    from: Vec3::new(n(1)?, n(2)?, n(3)?),
+                    to: Vec3::new(n(4)?, n(5)?, n(6)?),
+                    pitch,
+                    started: Instant::now(),
+                    seconds: n(7)?.max(0.1),
+                    reply: reply.clone(),
+                });
+                Ok(None)
+            }
             "open" => {
                 if self.title.is_none() {
                     return Err("a world is already open".into());
@@ -491,6 +547,7 @@ impl Game<'_> {
                 "present_mode": format!("{:?}", r.config.present_mode),
                 "drawn_sections": r.drawn_sections,
                 "uploaded_bytes": r.uploaded_bytes,
+                "resident_sections": r.resident_sections(),
             })
         });
         json!({
@@ -510,6 +567,7 @@ impl Game<'_> {
             "ticks": self.ticks,
             "day_time": self.world.day_time,
             "music": self.music.current(&self.audio.engine),
+            "sounds": self.audio.census(),
             "fishing": self.hook_status(),
             "tridents": self.tridents.len(),
             "rockets": self.rockets.len(),
@@ -519,7 +577,9 @@ impl Game<'_> {
             "using": self.using,
             "render_distance": self.streaming.radius,
             "chunks": self.world.chunks.len(),
-            "pending_chunks": self.streaming.pending(),
+            "mobs": self.mobs.len(),
+            "block_entities": self.world.block_entities.len(),
+            "pending_chunks": self.streaming.pending() + self.pending_uploads.len(),
             "generated_chunks": self.streaming.generated_total,
             "meshed_sections": self.streaming.meshed_total,
             "renderer": renderer,

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

@@ -17,10 +17,7 @@ use horizon_core::{
     random::{LegacyRandom, RandomSource},
 };
 use horizon_world::registry::BlockStateId;
-use std::{
-    collections::{HashMap, HashSet},
-    sync::Arc,
-};
+use std::{collections::HashMap, sync::Arc};
 
 type Pos = (i32, i32, i32);
 
@@ -319,7 +316,16 @@ impl Game<'_> {
             let Some(chunk) = self.world.chunks.get(&key).cloned() else {
                 continue;
             };
-            let name = |id: u16| &*self.res.facts.get(BlockStateId(u32::from(id))).name;
+            if self.creaking.hearts.is_empty() {
+                self.creaking.hearts = self
+                    .res
+                    .facts
+                    .states
+                    .iter()
+                    .map(|f| &*f.name == "minecraft:creaking_heart")
+                    .collect();
+            }
+            let hearts = &self.creaking.hearts;
             let _ = heart;
             for (si, section) in chunk.sections.iter().enumerate() {
                 if section.is_uniform(0) {
@@ -327,7 +333,7 @@ impl Game<'_> {
                 }
                 for i in 0..4096 {
                     let id = section.get(i);
-                    if name(id) != "minecraft:creaking_heart" {
+                    if !hearts.get(usize::from(id)).copied().unwrap_or(false) {
                         continue;
                     }
                     let (lx, lz, ly) = ((i & 15) as i32, ((i >> 4) & 15) as i32, (i >> 8) as i32);
@@ -343,8 +349,8 @@ impl Game<'_> {
                 }
             }
         }
-        let loaded: HashSet<(i32, i32)> = self.world.chunks.keys().copied().collect();
-        self.creaking.scanned.retain(|k| loaded.contains(k));
+        let chunks = &self.world.chunks;
+        self.creaking.scanned.retain(|k| chunks.contains_key(k));
     }
 }
 
@@ -352,5 +358,7 @@ impl Game<'_> {
 #[derive(Default)]
 pub(super) struct CreakingState {
     /// Chunks already scanned for heart blocks.
-    scanned: HashSet<(i32, i32)>,
+    scanned: horizon_client::fast_hash::FxHashSet<(i32, i32)>,
+    /// Which block states are creaking hearts, by state id.
+    hearts: Vec<bool>,
 }

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

@@ -403,6 +403,25 @@ impl Game<'_> {
         self.tick_raids();
         self.tick_creature_entities()
     }
+    /// `DistanceManager.inEntityTickingRange`: chunks within the simulation
+    /// distance (Chebyshev, in chunks) of the player or of a guest.
+    pub(super) fn entity_ticking_area(&self) -> impl Fn(i32, i32) -> bool + use<> {
+        let d = self.settings.simulation_distance.max(2);
+        let mut centres: Vec<(i32, i32)> = self.streaming.extra.iter().map(|&(c, _)| c).collect();
+        if let Some(p) = &self.player {
+            centres.push((
+                (p.position.x.floor() as i32) >> 4,
+                (p.position.z.floor() as i32) >> 4,
+            ));
+        }
+        let everywhere = centres.is_empty();
+        move |x, z| {
+            everywhere
+                || centres
+                    .iter()
+                    .any(|&(cx, cz)| ((x >> 4) - cx).abs().max(((z >> 4) - cz).abs()) <= d)
+        }
+    }
     /// The entity phase of `tick_creatures`: every mob's tick, deaths, and the
     /// projectiles and effects that follow from them.
     pub(super) fn tick_creature_entities(&mut self) -> Result<()> {
@@ -424,6 +443,7 @@ impl Game<'_> {
         let mut mobs = std::mem::take(&mut self.mobs);
         let mut dead = Vec::new();
         let mut died = std::mem::take(&mut self.died);
+        let ticking = self.entity_ticking_area();
         let level_random;
         {
             // The level random, lent to the mobs (brain behaviours draw from
@@ -441,6 +461,18 @@ impl Game<'_> {
                     keep.push(!m.hostile() || m.persistent);
                     continue;
                 }
+                // ServerLevel.tick: every loaded entity checks despawning, but
+                // only those in entity-ticking chunks (within the simulation
+                // distance) tick.
+                if !ticking(m.position.x.floor() as i32, m.position.z.floor() as i32) {
+                    let kept = horizon_client::mobs::ai::despawn_check(m, &w);
+                    if !kept {
+                        died.remove(&m.id);
+                        snapshot[i].alive = false;
+                    }
+                    keep.push(kept);
+                    continue;
+                }
                 horizon_client::mobs::apply_mob_pushes(m, &mut pushes);
                 let from = events.len();
                 let kept = m.tick(&w, &mut scratch, &mut events);
@@ -2248,11 +2280,29 @@ impl Game<'_> {
     pub(super) fn mob_geometry(&self, camera: glam::DVec3, alpha: f64, out: &mut Vec<Vertex>) {
         let atlas = &self.res.atlas;
         let lookup = |name: &str| atlas.sprites.get(name).map(|r| [r.u0, r.v0, r.u1, r.v1]);
+        let scale = f64::from(self.settings.entity_distance);
         for mob in &self.mobs {
             let d = glam::DVec3::new(mob.position.x, mob.position.y, mob.position.z) - camera;
-            if d.length_squared() > 128.0 * 128.0 {
+            // Entity.shouldRenderAtSqrDistance: 64 times the bounding box's
+            // mean edge, scaled by the entity distance option.
+            let (w, h, _) = mob.dims();
+            let range = (w + h + w) / 3.0 * 64.0 * scale;
+            if d.length_squared() >= range * range {
                 continue;
             }
+            // EntityRenderer.shouldRender: the culling box, grown by 0.5
+            // (GuardianRenderer also draws while its beam is out).
+            if let Some(view) = &self.view_frustum
+                && horizon_client::mobs::guardian::beam(mob, alpha as f32).is_none()
+            {
+                let lo =
+                    d.as_vec3() - glam::Vec3::new(w as f32 / 2.0 + 0.5, 0.5, w as f32 / 2.0 + 0.5);
+                let hi = d.as_vec3()
+                    + glam::Vec3::new(w as f32 / 2.0 + 0.5, h as f32 + 0.5, w as f32 / 2.0 + 0.5);
+                if !view.intersects(lo, hi) {
+                    continue;
+                }
+            }
             let light = self.world.light(
                 mob.position.x.floor() as i32,
                 (mob.position.y + mob.eye_height()).floor() as i32,

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

@@ -376,6 +376,7 @@ impl Game<'_> {
         self.set_default_game_mode(game_mode);
         self.ui.difficulty = props.difficulty as u8;
         self.settings.render_distance = props.view_distance.clamp(2, 32);
+        self.settings.simulation_distance = props.simulation_distance.clamp(2, 32);
         self.streaming.radius = self.settings.render_distance;
         self.settle_spawn()?;
         let gate_lists = lists.clone();

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

@@ -722,10 +722,9 @@ impl Game<'_> {
             .play("minecraft:entity.ender_dragon.hurt", Some(at), 5.0, pitch);
     }
     /// Player melee on the dragon's parts or a crystal under the crosshair.
-    pub(super) fn attack_dragon(&mut self) -> bool {
-        let Some(eye) = self.eye_position() else {
-            return false;
-        };
+    /// The dragon part under the crosshair within reach: its id and distance.
+    pub(super) fn dragon_hit(&self) -> Option<(u32, f64)> {
+        let eye = self.eye_position()?;
         let dir = super::view_vector(self.yaw, self.pitch);
         let reach: f64 = if self.creative { 5.0 } else { 3.0 };
         let mut best: Option<(u32, f64)> = None;
@@ -750,7 +749,12 @@ impl Game<'_> {
                 best = Some((id, t0));
             }
         }
-        let Some((id, d)) = best else { return false };
+        best
+    }
+    pub(super) fn attack_dragon(&mut self) -> bool {
+        let Some((id, d)) = self.dragon_hit() else {
+            return false;
+        };
         if !self.before_block(d) || self.mob_hit().is_some_and(|m| m.1 < d) {
             return false;
         }

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

@@ -86,6 +86,15 @@ impl Game<'_> {
             false,
         )
     }
+    /// `Camera.calculateHudFov`: the first-person hand's field of view.
+    pub(super) fn hud_fov_degrees(&self, partial: f32, camera: [f64; 3]) -> f32 {
+        self.view.calculate_hud_fov(
+            partial,
+            self.fov_effect_scale(),
+            self.death_time(),
+            self.camera_fluid(camera),
+        )
+    }
     /// The pose `GameRenderer.renderLevel` multiplies into the projection:
     /// `bobHurt`, then `bobView` with the View Bobbing option.
     pub(super) fn bob_matrix(&self, partial: f32) -> glam::Mat4 {

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

@@ -0,0 +1,372 @@
+//! The local player's hand: clicks and held attack through
+//! `horizon_client::first_person` (`Minecraft.startAttack` /
+//! `continueAttack`, `MultiPlayerGameMode` block breaking), the arm swing
+//! (`LivingEntity.SwingState`) and the first-person equip heights
+//! (`FirstPersonHandsAndItems`) with the item swap ticker they read.
+use super::{Game, Mining, Screen};
+use horizon_client::{
+    Result,
+    attack_strength::HeldStack,
+    first_person::{Hand, HandWorld, Hit, SwingAnimation, UseResult, swing_duration},
+    items::ItemStack,
+};
+
+/// The off hand's place in `visible_hands` (the main hand uses its hotbar slot).
+const OFFHAND: usize = usize::MAX;
+
+impl Game<'_> {
+    /// `LivingEntity.swing` with `getModifiedSwingDuration`.
+    pub(super) fn swing_hand(&mut self, hand: Hand, animation: SwingAnimation) {
+        let effects = &self.potions.effects;
+        let dig_speed = effects
+            .amplifier("haste")
+            .max(effects.amplifier("conduit_power"));
+        let fatigue = effects.amplifier("mining_fatigue");
+        let duration = swing_duration(animation, dig_speed, fatigue);
+        if self.swing.start_if_able(hand, animation, duration) {
+            self.swings_started += 1;
+        }
+    }
+    /// `swing(InteractionHand.MAIN_HAND)` with the default animation.
+    pub(super) fn swing_arm(&mut self) {
+        self.swing_hand(Hand::Main, SwingAnimation::DEFAULT);
+    }
+    /// `Player.resetAttackStrengthTicker`.
+    pub(super) fn reset_attack_strength(&mut self) {
+        self.attack_ticks = 0;
+        self.hand_strength.reset();
+    }
+    /// The attack and use part of `Minecraft.tick` for the local player:
+    /// attack clicks since the last tick and the held attack button.
+    pub(super) fn tick_local_hand(&mut self) -> Result<()> {
+        let attack_clicks = std::mem::take(&mut self.attack_clicks);
+        if self.screen == Screen::Playing && self.title.is_none() {
+            let mut clicks = std::mem::take(&mut self.clicks);
+            // keyAttack.isDown(); playing implies the grabbed mouse here
+            // (scripts under --control hold buttons without grabbing it).
+            let down = self.left;
+            let ticks = self.clicks.destroying.ticks;
+            let mut world = GameHands {
+                game: self,
+                error: None,
+            };
+            clicks.tick(&mut world, attack_clicks, 0, down, false);
+            let error = world.error.take();
+            self.clicks = clicks;
+            if let Some(e) = error {
+                return Err(e);
+            }
+            // A tick of breaking: the hit sound every fourth tick and the
+            // cracking particles.
+            let d = &self.clicks.destroying;
+            if d.active && d.ticks > ticks {
+                let (pos, first) = (d.pos, (d.ticks as u32 - 1).is_multiple_of(4));
+                let state = self.world.block(pos[0], pos[1], pos[2]);
+                if first {
+                    let sounds = self.res.facts.get(state).sounds.clone();
+                    self.audio.play(
+                        &sounds.hit,
+                        Some(pos.map(|v| f64::from(v) + 0.5)),
+                        (sounds.volume + 1.0) / 8.0,
+                        sounds.pitch * 0.5,
+                    );
+                }
+                if let Some(hit) = self.pick() {
+                    self.crack_particle(pos, hit.face, state);
+                }
+            }
+        } else {
+            // Minecraft.tick: a screen keeps the attack from starting.
+            self.clicks.miss_time = 10000;
+        }
+        let d = &self.clicks.destroying;
+        self.mining = d.active.then_some(Mining {
+            pos: d.pos,
+            progress: d.progress,
+            ticks: d.ticks as u32,
+        });
+        Ok(())
+    }
+    /// `BlockBehaviour.getDestroyProgress` with `Player.getDestroySpeed`.
+    pub(super) fn destroy_progress(&self, pos: [i32; 3]) -> f32 {
+        let state = self.world.block(pos[0], pos[1], pos[2]);
+        let facts = self.res.facts.get(state);
+        if facts.hardness == -1.0 {
+            return 0.0;
+        }
+        let held = self.held();
+        let mut speed = self.res.items.mining_speed(held, &facts.name);
+        speed = self.modify_destroy_speed(speed);
+        if let Some(eye) = self.eye_position()
+            && self
+                .res
+                .facts
+                .get(self.world.block(
+                    eye[0].floor() as i32,
+                    eye[1].floor() as i32,
+                    eye[2].floor() as i32,
+                ))
+                .fluid
+                == horizon_client::blocks::Fluid::Water
+        {
+            speed *= self.submerged_mining_speed();
+        }
+        if self.player.as_ref().is_some_and(|p| !p.ground.on_ground) {
+            speed /= 5.0;
+        }
+        let harvest = !facts.requires_tool || self.res.items.correct_for_drops(held, &facts.name);
+        speed / facts.hardness / if harvest { 30.0 } else { 100.0 }
+    }
+    /// Whether an attack would hit an entity rather than the block behind
+    /// it: the crosshair's `EntityHitResult`.
+    fn entity_targeted(&self) -> bool {
+        let before = |d: Option<f64>| d.is_some_and(|d| self.before_block(d));
+        before(self.painting_hit().map(|h| h.1))
+            || before(self.frame_hit().map(|h| h.1))
+            || before(self.armor_stand_hit().map(|h| h.1))
+            || before(self.boat_hit().map(|h| h.1))
+            || before(self.cart_hit().map(|h| h.1))
+            || before(self.dragon_hit().map(|h| h.1))
+            || before(self.mob_hit().map(|h| h.1))
+    }
+    /// `LocalPlayer.isHandsBusy`: paddling a boat.
+    fn hands_busy(&self) -> bool {
+        self.riding
+            .is_some_and(|id| self.boats.iter().any(|b| b.id == id))
+            && [
+                winit::keyboard::KeyCode::KeyW,
+                winit::keyboard::KeyCode::KeyS,
+                winit::keyboard::KeyCode::KeyA,
+                winit::keyboard::KeyCode::KeyD,
+            ]
+            .iter()
+            .any(|k| self.keys.contains(k))
+    }
+    /// `MultiPlayerGameMode.startUseItem`'s bookkeeping around the game's
+    /// use: nothing starts while a block is being broken or the hands are
+    /// busy, and `LocalPlayer.itemUsed` drops the hand after a use that
+    /// swung and spent (or, with infinite materials, kept) the item, or that
+    /// started using it.
+    pub(super) fn use_with_hand(&mut self) -> Result<()> {
+        if self.clicks.destroying.active || self.hands_busy() {
+            return Ok(());
+        }
+        let before = self.held().cloned();
+        let swings = self.swings_started;
+        let using = self.using.is_some();
+        self.use_item()?;
+        let swung = self.swings_started != swings;
+        let after = self.held().cloned();
+        let spent = match (&before, &after) {
+            (Some(a), Some(b)) => a.count != b.count || a.item != b.item || self.creative,
+            _ => false,
+        };
+        if (swung && spent) || (!using && self.using.is_some() && after.is_some()) {
+            self.heights.item_used(Hand::Main);
+        }
+        Ok(())
+    }
+    /// `LocalPlayer.tick`: the swing (`LivingEntity.baseTick`), the attack
+    /// strength and item swap tickers (`Player.tick`), then
+    /// `FirstPersonHandsAndItems.tick`.
+    pub(super) fn tick_hand(&mut self) {
+        self.swing.tick();
+        let main = self.inventory[self.selected].clone();
+        self.hand_strength.tick(main.as_ref().map(|s| HeldStack {
+            item: s.item.to_string(),
+            rest: format!("{} {} {:?}", s.count, s.damage, s.extra),
+        }));
+        let next = [(self.selected, main), (OFFHAND, self.offhand.clone())];
+        // shouldInstantlyReplaceVisibleItem: the same stack, or an equal one
+        // (matchesIgnoringComponents; every item plays the swap animation).
+        // A stack that stays in its slot with the same item is the same
+        // stack, whatever its count (vanilla shrinks and grows it in place).
+        let mut changed = [false; 2];
+        for h in 0..2 {
+            let same = match (&self.visible_hands[h], &next[h]) {
+                ((_, None), (_, None)) => true,
+                ((slot, Some(a)), (next_slot, Some(b))) => {
+                    a.item == b.item
+                        && (slot == next_slot || (a.count == b.count && a.extra == b.extra))
+                }
+                _ => false,
+            };
+            if same {
+                self.visible_hands[h] = next[h].clone();
+            }
+            changed[h] = !same;
+        }
+        let speed = self.main_hand_attack_speed();
+        let replace = self.heights.tick(
+            self.hands_busy(),
+            self.hand_strength.swap_scale(1.0, speed),
+            changed,
+        );
+        for h in 0..2 {
+            if replace[h] {
+                self.visible_hands[h] = next[h].clone();
+            }
+        }
+    }
+    /// `Attributes.ATTACK_SPEED` with the main-hand item's modifier.
+    fn main_hand_attack_speed(&self) -> f64 {
+        horizon_client::attack_strength::BASE_ATTACK_SPEED
+            + self
+                .held()
+                .and_then(|h| self.res.items.get(&h.item))
+                .map_or(0.0, |i| f64::from(i.attack_speed))
+    }
+    /// The visible main- and off-hand items.
+    pub(super) fn visible_hand_items(&self) -> [Option<ItemStack>; 2] {
+        [
+            self.visible_hands[0].1.clone(),
+            self.visible_hands[1].1.clone(),
+        ]
+    }
+}
+
+/// The game as `first_person`'s world: the crosshair, breaking and attacking.
+struct GameHands<'g, 'a> {
+    game: &'g mut Game<'a>,
+    error: Option<Box<dyn std::error::Error>>,
+}
+impl GameHands<'_, '_> {
+    fn keep(&mut self, r: Result<()>) {
+        if let Err(e) = r
+            && self.error.is_none()
+        {
+            self.error = Some(e);
+        }
+    }
+}
+impl HandWorld for GameHands<'_, '_> {
+    fn hit(&mut self) -> Hit {
+        if self.game.entity_targeted() {
+            return Hit::Entity;
+        }
+        match self.game.pick() {
+            Some(h) => Hit::Block {
+                pos: h.pos,
+                face: match h.face {
+                    [0, -1, 0] => 0,
+                    [0, 1, 0] => 1,
+                    [0, 0, -1] => 2,
+                    [0, 0, 1] => 3,
+                    [-1, 0, 0] => 4,
+                    _ => 5,
+                },
+            },
+            None => Hit::Miss,
+        }
+    }
+    fn is_air(&mut self, pos: [i32; 3]) -> bool {
+        let state = self.game.world.block(pos[0], pos[1], pos[2]);
+        self.game.res.facts.get(state).name.ends_with("air")
+    }
+    fn creative(&self) -> bool {
+        self.game.creative
+    }
+    fn spectator(&self) -> bool {
+        self.game.spectator()
+    }
+    fn instabuild(&self) -> bool {
+        self.game.creative
+    }
+    fn hands_busy(&self) -> bool {
+        self.game.hands_busy()
+    }
+    fn using_item(&self) -> bool {
+        self.game.using.is_some()
+    }
+    fn item_enabled(&mut self, _: Hand) -> bool {
+        true
+    }
+    fn held_empty(&mut self, hand: Hand) -> bool {
+        match hand {
+            Hand::Main => self.game.held().is_none(),
+            Hand::Off => self.game.offhand.is_none(),
+        }
+    }
+    fn held_count(&mut self, hand: Hand) -> i32 {
+        let stack = match hand {
+            Hand::Main => self.game.held(),
+            Hand::Off => self.game.offhand.as_ref(),
+        };
+        stack.map_or(0, |s| s.count as i32)
+    }
+    fn infinite_materials(&self) -> bool {
+        self.game.creative
+    }
+    fn cannot_attack(&mut self) -> bool {
+        false
+    }
+    fn piercing_weapon(&mut self) -> bool {
+        false
+    }
+    fn attack_animation(&mut self) -> SwingAnimation {
+        SwingAnimation::DEFAULT
+    }
+    fn interact_animation(&mut self, _: Hand) -> SwingAnimation {
+        SwingAnimation::DEFAULT
+    }
+    fn piercing_attack(&mut self, _: SwingAnimation) {}
+    fn attack_entity(&mut self) -> bool {
+        self.game.attack()
+    }
+    fn block_action_restricted(&mut self, _: [i32; 3]) -> bool {
+        !self.game.may_build()
+    }
+    fn within_border(&mut self, _: [i32; 3]) -> bool {
+        true
+    }
+    fn attack_block(&mut self, _: [i32; 3]) {}
+    fn destroy_progress(&mut self, pos: [i32; 3]) -> f32 {
+        self.game.destroy_progress(pos)
+    }
+    fn destroy_block(&mut self, pos: [i32; 3]) -> bool {
+        if self.is_air(pos) {
+            return false;
+        }
+        // Item.canDestroyBlock: swords, tridents and maces cannot break
+        // blocks in creative.
+        let held = self.game.held().map(|s| s.item.to_string());
+        if self.game.creative
+            && held.is_some_and(|i| {
+                i.ends_with("_sword") || i == "minecraft:trident" || i == "minecraft:mace"
+            })
+        {
+            return false;
+        }
+        let r = self.game.break_block(pos);
+        self.keep(r);
+        true
+    }
+    fn main_hand_key(&mut self) -> String {
+        self.game
+            .held()
+            .map_or(String::new(), |s| format!("{} {:?}", s.item, s.extra))
+    }
+    fn destroy_stage(&mut self, _: [i32; 3], _: Option<i32>) {}
+    fn swing(&mut self, hand: Hand, animation: SwingAnimation) {
+        self.game.swing_hand(hand, animation);
+    }
+    fn reset_attack_strength(&mut self) {
+        self.game.reset_attack_strength();
+    }
+    fn entity_within_border(&mut self) -> bool {
+        true
+    }
+    fn use_on_entity(&mut self, _: Hand) -> Option<UseResult> {
+        None
+    }
+    fn use_on_block(&mut self, _: Hand) -> UseResult {
+        UseResult::Pass
+    }
+    fn use_item(&mut self, _: Hand) -> UseResult {
+        UseResult::Pass
+    }
+    fn item_used(&mut self, hand: Hand) {
+        self.game.heights.item_used(hand);
+    }
+    fn release_using(&mut self) {}
+}

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

@@ -29,8 +29,7 @@ pub(super) struct GuestPlay {
     using: Option<(usize, u32)>,
     use_delay: u32,
     attack_ticks: u32,
-    swing: Option<u32>,
-    swing_anim: (f32, f32),
+    swing: horizon_client::first_person::SwingState,
     /// The block being dug and the face the client aimed at.
     digging: Option<([i32; 3], [i32; 3])>,
     last_progress: i32,
@@ -131,8 +130,7 @@ impl Game<'_> {
         let using = std::mem::replace(&mut self.using, play.using.take());
         let use_delay = std::mem::replace(&mut self.use_delay, play.use_delay);
         let attack_ticks = std::mem::replace(&mut self.attack_ticks, play.attack_ticks);
-        let swing = std::mem::replace(&mut self.swing, play.swing.take());
-        let swing_anim = std::mem::replace(&mut self.swing_anim, play.swing_anim);
+        let swing = std::mem::replace(&mut self.swing, play.swing);
         let (left, right) = (self.left, self.right);
         self.left = play.digging.is_some();
         self.right = play.using.is_some() || self.using.is_some();
@@ -153,7 +151,6 @@ impl Game<'_> {
         play.use_delay = std::mem::replace(&mut self.use_delay, use_delay);
         play.attack_ticks = std::mem::replace(&mut self.attack_ticks, attack_ticks);
         play.swing = std::mem::replace(&mut self.swing, swing);
-        play.swing_anim = std::mem::replace(&mut self.swing_anim, swing_anim);
         self.container = container;
         self.screen = screen;
         if sneak {
@@ -689,7 +686,7 @@ impl Game<'_> {
             .mining
             .as_ref()
             .map_or(-1, |m| (m.progress.clamp(0.0, 1.0) * 10.0) as i32 - 1);
-        let swinging = play.swing.is_some();
+        let swinging = play.swing.swinging();
         if progress != play.last_progress && progress >= 0 {
             play.last_progress = progress;
             host.hub.broadcast_near(
@@ -779,7 +776,7 @@ impl Game<'_> {
             };
             let (id, at) = (g.entity_id, g.position);
             let play = host.play.get_mut(&conn).expect("play");
-            let swinging = play.swing == Some(0);
+            let swinging = play.swing.swinging() && play.swing.ticks == 0;
             if swinging && !play.swung {
                 host.hub.swing(id, 0, at, Some(conn));
             }

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

@@ -762,9 +762,14 @@ impl Game<'_> {
     /// Every cart but the ridden one (which ticks with its rider).
     pub(super) fn tick_carts(&mut self) {
         self.push_carts();
+        // ServerLevel.tick: only entities in entity-ticking chunks tick.
+        let ticking = self.entity_ticking_area();
         let mut i = 0;
         while i < self.carts.len() {
-            if Some(self.carts[i].id) == self.riding {
+            let p = self.carts[i].position;
+            if Some(self.carts[i].id) == self.riding
+                || !ticking(p.x.floor() as i32, p.z.floor() as i32)
+            {
                 i += 1;
                 continue;
             }
@@ -890,7 +895,7 @@ impl Game<'_> {
         self.swing_arm();
         true
     }
-    fn cart_hit(&self) -> Option<(usize, f64)> {
+    pub(super) fn cart_hit(&self) -> Option<(usize, f64)> {
         let eye = self.eye_position()?;
         let dir = view_vector(self.yaw, self.pitch);
         let reach: f64 = if self.creative { 5.0 } else { 3.0 };

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

@@ -142,7 +142,10 @@ impl Game<'_> {
         let s = &self.settings;
         if let Some(r) = self.renderer.as_mut() {
             r.gamma = s.gamma;
-            r.set_vsync(s.vsync);
+            r.set_present_mode(s.vsync, s.horizon.present_mode);
+            r.animated_textures = s.horizon.animated_textures;
+            r.set_mipmap_levels(s.mipmap_levels.max(0) as u32);
+            r.set_world_post(s.horizon.resolution_scale as f32 / 100.0, s.horizon.fxaa);
         }
         if let Some(w) = &self.window {
             let want = s.fullscreen;
@@ -207,6 +210,14 @@ impl Game<'_> {
             return;
         }
         let limit = self.framerate_limit();
-        horizon_client::window::end_frame(&mut self.limiter, limit, &mut self.frame_clock);
+        match self.settings.horizon.pacing {
+            horizon_client::graphics::Pacing::Precise => {
+                horizon_client::window::end_frame(&mut self.limiter, limit, &mut self.frame_clock)
+            }
+            horizon_client::graphics::Pacing::Efficient => {
+                let mut clock = horizon_client::window::SleepingClock(self.frame_clock);
+                horizon_client::window::end_frame(&mut self.limiter, limit, &mut clock);
+            }
+        }
     }
 }

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

@@ -831,7 +831,7 @@ impl Game<'_> {
         self.spawn_loaded_entities();
         let keys: HashSet<(i32, i32)> = unloaded.iter().map(|c| (c.x, c.z)).collect();
         let chunks = self.entity_chunks(&keys, true);
-        if let Err(e) = self.save.save_entities(chunks) {
+        if let Err(e) = self.save.save_entities_later(chunks) {
             eprintln!("Horizon: failed to save entities: {e}");
         }
     }

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

@@ -297,8 +297,8 @@ impl Game<'_> {
         }
         let crouching = p.pose == Pose::Crouching;
         let (position, flying) = (p.position, p.flying || p.fall_flying);
-        let attack = self.swing_anim;
-        let swinging = self.swing.is_some();
+        let attack = (self.swing.old_animation, self.swing.animation);
+        let swinging = self.swing.swinging();
         let (yaw, pitch) = (self.yaw, self.pitch);
         let main = self.inventory[self.selected]
             .as_ref()

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/arena.rs

@@ -0,0 +1,180 @@
+//! One vertex buffer for every terrain section: sections own ranges of it, so
+//! a frame binds it once and draws every section with indirect multi-draw.
+use std::collections::BTreeMap;
+
+/// Ranges are rounded up to this many vertices to limit fragmentation.
+const GRAIN: u64 = 256;
+
+/// Free vertex ranges: start -> length, never adjacent.
+#[derive(Debug, PartialEq)]
+struct FreeList(BTreeMap<u64, u64>);
+
+impl FreeList {
+    fn new(capacity: u64) -> Self {
+        Self(BTreeMap::from([(0, capacity)]))
+    }
+    /// First fit.
+    fn take(&mut self, len: u64) -> Option<u64> {
+        let (&start, &free) = self.0.iter().find(|(_, l)| **l >= len)?;
+        self.0.remove(&start);
+        if free > len {
+            self.0.insert(start + len, free - len);
+        }
+        Some(start)
+    }
+    fn give(&mut self, start: u64, len: u64) {
+        let (mut start, mut len) = (start, len);
+        if let Some((&prev, &prev_len)) = self.0.range(..start).next_back()
+            && prev + prev_len == start
+        {
+            self.0.remove(&prev);
+            start = prev;
+            len += prev_len;
+        }
+        if let Some(next_len) = self.0.remove(&(start + len)) {
+            len += next_len;
+        }
+        self.0.insert(start, len);
+    }
+}
+
+/// One vertex buffer of the arena; only the newest page grows.
+struct Page {
+    buffer: wgpu::Buffer,
+    /// Capacity in vertices.
+    capacity: u64,
+    free: FreeList,
+}
+
+/// Terrain vertices in pages of at most `page_limit` vertices (devices cap
+/// buffer sizes): a section's vertices sit in one page.
+pub struct Arena {
+    pages: Vec<Page>,
+    stride: u64,
+    page_limit: u64,
+}
+
+impl Arena {
+    pub fn new(device: &wgpu::Device, stride: u64, capacity: u64) -> Self {
+        // 256 MiB pages, or less where the device's buffers are smaller.
+        let bytes = device.limits().max_buffer_size.min(256 << 20);
+        let page_limit = (bytes / stride) / GRAIN * GRAIN;
+        let capacity = capacity.next_multiple_of(GRAIN).min(page_limit);
+        Self {
+            pages: vec![Page {
+                buffer: Self::create(device, stride, capacity),
+                capacity,
+                free: FreeList::new(capacity),
+            }],
+            stride,
+            page_limit,
+        }
+    }
+    fn create(device: &wgpu::Device, stride: u64, capacity: u64) -> wgpu::Buffer {
+        device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("Section vertex arena"),
+            size: capacity * stride,
+            usage: wgpu::BufferUsages::VERTEX
+                | wgpu::BufferUsages::COPY_DST
+                | wgpu::BufferUsages::COPY_SRC,
+            mapped_at_creation: false,
+        })
+    }
+    /// The rounded length a request of `vertices` occupies.
+    fn span(vertices: u64) -> u64 {
+        vertices.max(1).next_multiple_of(GRAIN)
+    }
+    pub fn buffer(&self, page: u32) -> &wgpu::Buffer {
+        &self.pages[page as usize].buffer
+    }
+    /// A range of `vertices`: (page, first vertex). Grows the newest page
+    /// (copying its contents on the GPU) or starts a new one when nothing
+    /// free is large enough.
+    pub fn alloc(
+        &mut self,
+        device: &wgpu::Device,
+        queue: &wgpu::Queue,
+        vertices: u64,
+    ) -> (u32, u64) {
+        let len = Self::span(vertices).min(self.page_limit);
+        for (i, page) in self.pages.iter_mut().enumerate() {
+            if let Some(start) = page.free.take(len) {
+                return (i as u32, start);
+            }
+        }
+        let last = self.pages.len() - 1;
+        let current = self.pages[last].capacity;
+        if current < self.page_limit {
+            let grown = (current * 2).max(current + len).min(self.page_limit);
+            if grown - current >= len || grown == self.page_limit {
+                self.grow(device, queue, last, grown);
+                if let Some(start) = self.pages[last].free.take(len) {
+                    return (last as u32, start);
+                }
+            }
+        }
+        let capacity = (1 << 20u64).max(len).min(self.page_limit);
+        let mut free = FreeList::new(capacity);
+        let start = free.take(len).expect("a new page fits one section");
+        self.pages.push(Page {
+            buffer: Self::create(device, self.stride, capacity),
+            capacity,
+            free,
+        });
+        ((self.pages.len() - 1) as u32, start)
+    }
+    pub fn release(&mut self, page: u32, start: u64, vertices: u64) {
+        let len = Self::span(vertices).min(self.page_limit);
+        self.pages[page as usize].free.give(start, len);
+    }
+    fn grow(&mut self, device: &wgpu::Device, queue: &wgpu::Queue, page: usize, capacity: u64) {
+        let capacity = capacity.next_multiple_of(GRAIN).min(self.page_limit);
+        let buffer = Self::create(device, self.stride, capacity);
+        let old = &mut self.pages[page];
+        let mut encoder = device.create_command_encoder(&wgpu::CommandEncoderDescriptor {
+            label: Some("Grow section arena"),
+        });
+        encoder.copy_buffer_to_buffer(&old.buffer, 0, &buffer, 0, old.capacity * self.stride);
+        // Writes queued for the old buffer run before this copy.
+        queue.submit([encoder.finish()]);
+        let previous = old.capacity;
+        old.buffer = buffer;
+        old.capacity = capacity;
+        old.free.give(previous, capacity - previous);
+    }
+    pub fn clear(&mut self) {
+        for page in &mut self.pages {
+            page.free = FreeList::new(page.capacity);
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn free_ranges_coalesce() {
+        let mut free = FreeList::new(4 * GRAIN);
+        let a = free.take(GRAIN).unwrap();
+        let b = free.take(2 * GRAIN).unwrap();
+        let c = free.take(GRAIN).unwrap();
+        assert_eq!((a, b, c), (0, GRAIN, 3 * GRAIN));
+        assert_eq!(free.take(1), None);
+        free.give(a, GRAIN);
+        free.give(c, GRAIN);
+        // Two holes of one grain: a two-grain request does not fit.
+        assert_eq!(free.take(2 * GRAIN), None);
+        free.give(b, 2 * GRAIN);
+        assert_eq!(free, FreeList::new(4 * GRAIN));
+    }
+
+    #[test]
+    fn first_fit_reuses_the_lowest_hole() {
+        let mut free = FreeList::new(8 * GRAIN);
+        let a = free.take(GRAIN).unwrap();
+        let _b = free.take(GRAIN).unwrap();
+        free.give(a, GRAIN);
+        assert_eq!(free.take(GRAIN), Some(a));
+    }
+}

crates/horizon-client/src/gfx/occlusion.rs

@@ -0,0 +1,196 @@
+//! `SectionOcclusionGraph`: which sections the camera can see through open
+//! faces. Breadth-first from the camera section through the faces each
+//! section's VisGraph connects, never stepping back towards the camera.
+//!
+//! The search runs over dense arrays around the camera rather than hash sets,
+//! so it stays cheap enough to redo whenever a section is meshed.
+use super::SectionKey;
+use std::collections::{HashMap, VecDeque};
+
+const STEPS: [(i32, i32, i32); 6] = [
+    (0, -1, 0),
+    (0, 1, 0),
+    (0, 0, -1),
+    (0, 0, 1),
+    (-1, 0, 0),
+    (1, 0, 0),
+];
+const NONE: u8 = 6;
+
+pub struct Occlusion {
+    /// VisGraph connectivity per column, one entry per section (bottom first).
+    columns: HashMap<(i32, i32), Box<[u64]>>,
+    sections: i32,
+    dirty: bool,
+    from: Option<SectionKey>,
+    radius: i32,
+    /// The searched box: lowest section y and its height in sections.
+    y0: i32,
+    height: i32,
+    reached: Vec<bool>,
+    vis: Vec<u64>,
+    queue: VecDeque<(u32, u8, u8)>,
+}
+
+impl Occlusion {
+    pub fn new(sections: i32) -> Self {
+        Self {
+            columns: HashMap::new(),
+            sections,
+            dirty: true,
+            from: None,
+            radius: 0,
+            y0: 0,
+            height: 0,
+            reached: Vec::new(),
+            vis: Vec::new(),
+            queue: VecDeque::new(),
+        }
+    }
+    pub fn set(&mut self, key: SectionKey, vis: u64) {
+        if !(0..self.sections).contains(&key.1) {
+            return;
+        }
+        let sections = self.sections as usize;
+        let column = self
+            .columns
+            .entry((key.0, key.2))
+            .or_insert_with(|| vec![crate::mesher::ALL_VISIBLE; sections].into());
+        let slot = &mut column[key.1 as usize];
+        if *slot != vis {
+            *slot = vis;
+            self.dirty = true;
+        }
+    }
+    pub fn remove(&mut self, key: SectionKey) {
+        let Some(column) = self.columns.get_mut(&(key.0, key.2)) else {
+            return;
+        };
+        if let Some(slot) = column.get_mut(key.1 as usize)
+            && *slot != crate::mesher::ALL_VISIBLE
+        {
+            *slot = crate::mesher::ALL_VISIBLE;
+            self.dirty = true;
+        }
+        if column.iter().all(|&v| v == crate::mesher::ALL_VISIBLE) {
+            self.columns.remove(&(key.0, key.2));
+        }
+    }
+    pub fn clear(&mut self) {
+        self.columns.clear();
+        self.dirty = true;
+    }
+    fn index(&self, key: SectionKey) -> Option<usize> {
+        let from = self.from?;
+        let (dx, dz, dy) = (key.0 - from.0, key.2 - from.2, key.1 - self.y0);
+        let side = 2 * self.radius + 1;
+        if dx.abs() > self.radius || dz.abs() > self.radius || !(0..self.height).contains(&dy) {
+            return None;
+        }
+        Some((((dz + self.radius) * side + dx + self.radius) * self.height + dy) as usize)
+    }
+    fn key(&self, index: usize) -> SectionKey {
+        let from = self.from.expect("searched");
+        let side = 2 * self.radius + 1;
+        let i = index as i32;
+        let dy = i % self.height;
+        let column = i / self.height;
+        (
+            from.0 + column % side - self.radius,
+            self.y0 + dy,
+            from.2 + column / side - self.radius,
+        )
+    }
+    pub fn contains(&self, key: SectionKey) -> bool {
+        self.index(key).is_some_and(|i| self.reached[i])
+    }
+    /// Search again when sections changed or the camera moved to another section.
+    pub fn update(&mut self, from: SectionKey, radius: i32) {
+        if !self.dirty && self.from == Some(from) && self.radius == radius {
+            return;
+        }
+        self.from = Some(from);
+        self.radius = radius;
+        self.y0 = from.1.min(-1);
+        self.height = from.1.max(self.sections) - self.y0 + 1;
+        let side = (2 * radius + 1) as usize;
+        let size = side * side * self.height as usize;
+        self.reached.clear();
+        self.reached.resize(size, false);
+        self.vis.clear();
+        self.vis.resize(size, crate::mesher::ALL_VISIBLE);
+        for dz in -radius..=radius {
+            for dx in -radius..=radius {
+                let Some(column) = self.columns.get(&(from.0 + dx, from.2 + dz)) else {
+                    continue;
+                };
+                let base = self
+                    .index((from.0 + dx, 0, from.2 + dz))
+                    .expect("column inside the searched box");
+                self.vis[base..base + column.len()].copy_from_slice(column);
+            }
+        }
+        let start = self.index(from).expect("camera inside the searched box");
+        self.reached[start] = true;
+        self.queue.clear();
+        self.queue.push_back((start as u32, NONE, 0));
+        while let Some((index, entered, travelled)) = self.queue.pop_front() {
+            let vis = self.vis[index as usize];
+            let key = self.key(index as usize);
+            for (d, step) in STEPS.iter().enumerate() {
+                let opposite = d ^ 1;
+                if travelled & (1 << opposite) != 0 {
+                    continue;
+                }
+                if entered != NONE && vis & (1 << (usize::from(entered) * 6 + d)) == 0 {
+                    continue;
+                }
+                let next = (key.0 + step.0, key.1 + step.1, key.2 + step.2);
+                if next.1 < -1 || next.1 > self.sections {
+                    continue;
+                }
+                let Some(n) = self.index(next) else { continue };
+                if !self.reached[n] {
+                    self.reached[n] = true;
+                    self.queue
+                        .push_back((n as u32, opposite as u8, travelled | (1 << d)));
+                }
+            }
+        }
+        self.dirty = false;
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::mesher::ALL_VISIBLE;
+
+    #[test]
+    fn open_space_reaches_the_whole_box() {
+        let mut o = Occlusion::new(4);
+        o.update((0, 1, 0), 2);
+        for x in -2..=2 {
+            for z in -2..=2 {
+                for y in -1..=4 {
+                    assert!(o.contains((x, y, z)), "{x} {y} {z}");
+                }
+            }
+        }
+        assert!(!o.contains((3, 1, 0)));
+    }
+
+    #[test]
+    fn closed_neighbours_hide_what_is_behind_them() {
+        let mut o = Occlusion::new(4);
+        for (dx, dy, dz) in STEPS {
+            o.set((dx, 1 + dy, dz), 0);
+        }
+        o.update((0, 1, 0), 3);
+        assert!(o.contains((1, 1, 0)), "a neighbour is seen");
+        assert!(!o.contains((2, 1, 0)), "nothing shows through it");
+        o.set((1, 1, 0), ALL_VISIBLE);
+        o.update((0, 1, 0), 3);
+        assert!(o.contains((2, 1, 0)));
+    }
+}

crates/horizon-client/src/gfx/timing.rs

@@ -0,0 +1,125 @@
+//! GPU frame time from timestamp queries, read back a few frames late so the
+//! CPU never waits for it. Frames whose readback slot is still busy go untimed.
+use std::sync::{
+    Arc,
+    atomic::{AtomicU8, Ordering},
+};
+
+const SLOTS: usize = 4;
+const FREE: u8 = 0;
+const PENDING: u8 = 1;
+const MAPPED: u8 = 2;
+
+struct Slot {
+    buffer: wgpu::Buffer,
+    state: Arc<AtomicU8>,
+}
+
+pub struct GpuTimer {
+    queries: wgpu::QuerySet,
+    resolve: wgpu::Buffer,
+    slots: Vec<Slot>,
+    /// The slot this frame writes into, when one was free at `begin`.
+    current: Option<usize>,
+    next: usize,
+    period_ns: f32,
+}
+
+impl GpuTimer {
+    /// The features timing needs; `None` when the adapter lacks them.
+    pub fn features(adapter: &wgpu::Adapter) -> wgpu::Features {
+        let wanted =
+            wgpu::Features::TIMESTAMP_QUERY | wgpu::Features::TIMESTAMP_QUERY_INSIDE_ENCODERS;
+        if adapter.features().contains(wanted) {
+            wanted
+        } else {
+            wgpu::Features::empty()
+        }
+    }
+    pub fn new(device: &wgpu::Device, queue: &wgpu::Queue) -> Option<Self> {
+        if !device
+            .features()
+            .contains(wgpu::Features::TIMESTAMP_QUERY_INSIDE_ENCODERS)
+        {
+            return None;
+        }
+        let queries = device.create_query_set(&wgpu::QuerySetDescriptor {
+            label: Some("Frame timestamps"),
+            ty: wgpu::QueryType::Timestamp,
+            count: 2,
+        });
+        let resolve = device.create_buffer(&wgpu::BufferDescriptor {
+            label: Some("Frame timestamp resolve"),
+            size: 16,
+            usage: wgpu::BufferUsages::QUERY_RESOLVE | wgpu::BufferUsages::COPY_SRC,
+            mapped_at_creation: false,
+        });
+        let slots = (0..SLOTS)
+            .map(|_| Slot {
+                buffer: device.create_buffer(&wgpu::BufferDescriptor {
+                    label: Some("Frame timestamp readback"),
+                    size: 16,
+                    usage: wgpu::BufferUsages::MAP_READ | wgpu::BufferUsages::COPY_DST,
+                    mapped_at_creation: false,
+                }),
+                state: Arc::new(AtomicU8::new(FREE)),
+            })
+            .collect();
+        Some(Self {
+            queries,
+            resolve,
+            slots,
+            current: None,
+            next: 0,
+            period_ns: queue.get_timestamp_period(),
+        })
+    }
+    pub fn begin(&mut self, encoder: &mut wgpu::CommandEncoder) {
+        let slot = self.next;
+        self.current = (self.slots[slot].state.load(Ordering::Acquire) == FREE).then_some(slot);
+        if self.current.is_some() {
+            encoder.write_timestamp(&self.queries, 0);
+        }
+    }
+    pub fn end(&mut self, encoder: &mut wgpu::CommandEncoder) {
+        let Some(slot) = self.current else { return };
+        encoder.write_timestamp(&self.queries, 1);
+        encoder.resolve_query_set(&self.queries, 0..2, &self.resolve, 0);
+        encoder.copy_buffer_to_buffer(&self.resolve, 0, &self.slots[slot].buffer, 0, 16);
+    }
+    /// After the frame's submission: start reading its timestamps back.
+    pub fn submitted(&mut self) {
+        let Some(slot) = self.current.take() else {
+            return;
+        };
+        let state = self.slots[slot].state.clone();
+        state.store(PENDING, Ordering::Release);
+        self.slots[slot]
+            .buffer
+            .slice(..)
+            .map_async(wgpu::MapMode::Read, move |result| {
+                state.store(
+                    if result.is_ok() { MAPPED } else { FREE },
+                    Ordering::Release,
+                );
+            });
+        self.next = (slot + 1) % SLOTS;
+    }
+    /// GPU milliseconds of frames whose timestamps have arrived, oldest first.
+    pub fn collect(&mut self, device: &wgpu::Device, out: &mut Vec<f32>) {
+        let _ = device.poll(wgpu::PollType::Poll);
+        for i in 0..SLOTS {
+            let slot = &self.slots[(self.next + i) % SLOTS];
+            if slot.state.load(Ordering::Acquire) != MAPPED {
+                continue;
+            }
+            if let Ok(data) = slot.buffer.slice(..).get_mapped_range() {
+                let stamps: &[u64] = bytemuck::cast_slice(&data);
+                let ticks = stamps[1].saturating_sub(stamps[0]);
+                out.push((ticks as f64 * f64::from(self.period_ns) / 1e6) as f32);
+            }
+            slot.buffer.unmap();
+            slot.state.store(FREE, Ordering::Release);
+        }
+    }
+}

crates/horizon-client/src/gfx/world_post.rs

@@ -0,0 +1,193 @@
+//! Resolution scale and FXAA (Horizon settings): the world renders into its
+//! own target at the scaled size, then one full-screen pass copies or
+//! anti-aliases it onto the screen, under the hand and HUD. With neither
+//! setting on, the world renders straight to the screen as before.
+
+struct WorldTarget {
+    size: [u32; 2],
+    color: wgpu::TextureView,
+    depth: wgpu::TextureView,
+    group: wgpu::BindGroup,
+}
+
+pub struct Post {
+    layout: wgpu::BindGroupLayout,
+    sampler: wgpu::Sampler,
+    copy: wgpu::RenderPipeline,
+    fxaa: wgpu::RenderPipeline,
+    format: wgpu::TextureFormat,
+    /// World resolution relative to the window (0.5..=2.0).
+    pub scale: f32,
+    pub antialias: bool,
+    target: Option<WorldTarget>,
+}
+
+impl Post {
+    pub fn new(device: &wgpu::Device, format: wgpu::TextureFormat) -> Self {
+        let shader = device.create_shader_module(wgpu::ShaderModuleDescriptor {
+            label: Some("Horizon post"),
+            source: wgpu::ShaderSource::Wgsl(include_str!("../world_post.wgsl").into()),
+        });
+        let layout = device.create_bind_group_layout(&wgpu::BindGroupLayoutDescriptor {
+            label: Some("Horizon post bindings"),
+            entries: &[
+                wgpu::BindGroupLayoutEntry {
+                    binding: 0,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Texture {
+                        sample_type: wgpu::TextureSampleType::Float { filterable: true },
+                        view_dimension: wgpu::TextureViewDimension::D2,
+                        multisampled: false,
+                    },
+                    count: None,
+                },
+                wgpu::BindGroupLayoutEntry {
+                    binding: 1,
+                    visibility: wgpu::ShaderStages::FRAGMENT,
+                    ty: wgpu::BindingType::Sampler(wgpu::SamplerBindingType::Filtering),
+                    count: None,
+                },
+            ],
+        });
+        let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
+            label: Some("Horizon post"),
+            bind_group_layouts: &[Some(&layout)],
+            ..Default::default()
+        });
+        let pipeline = |entry: &str| {
+            device.create_render_pipeline(&wgpu::RenderPipelineDescriptor {
+                label: Some("Horizon post"),
+                layout: Some(&pipeline_layout),
+                vertex: wgpu::VertexState {
+                    module: &shader,
+                    entry_point: Some("vs_post"),
+                    compilation_options: Default::default(),
+                    buffers: &[],
+                },
+                primitive: Default::default(),
+                depth_stencil: None,
+                multisample: Default::default(),
+                fragment: Some(wgpu::FragmentState {
+                    module: &shader,
+                    entry_point: Some(entry),
+                    compilation_options: Default::default(),
+                    targets: &[Some(wgpu::ColorTargetState {
+                        format,
+                        blend: None,
+                        write_mask: wgpu::ColorWrites::ALL,
+                    })],
+                }),
+                multiview_mask: None,
+                cache: None,
+            })
+        };
+        let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
+            label: Some("Horizon post"),
+            mag_filter: wgpu::FilterMode::Linear,
+            min_filter: wgpu::FilterMode::Linear,
+            ..Default::default()
+        });
+        Self {
+            copy: pipeline("fs_copy"),
+            fxaa: pipeline("fs_fxaa"),
+            layout,
+            sampler,
+            format,
+            scale: 1.0,
+            antialias: false,
+            target: None,
+        }
+    }
+    /// The world's colour and depth targets this frame, or `None` to draw
+    /// it straight to the screen.
+    pub fn prepare(
+        &mut self,
+        device: &wgpu::Device,
+        window: [u32; 2],
+    ) -> Option<(wgpu::TextureView, wgpu::TextureView)> {
+        if self.scale == 1.0 && !self.antialias {
+            self.target = None;
+            return None;
+        }
+        let size = window.map(|v| ((v as f32 * self.scale).round() as u32).clamp(1, 8192));
+        if self.target.as_ref().is_none_or(|t| t.size != size) {
+            let extent = wgpu::Extent3d {
+                width: size[0],
+                height: size[1],
+                depth_or_array_layers: 1,
+            };
+            let texture = |label, format, usage| {
+                device
+                    .create_texture(&wgpu::TextureDescriptor {
+                        label: Some(label),
+                        size: extent,
+                        mip_level_count: 1,
+                        sample_count: 1,
+                        dimension: wgpu::TextureDimension::D2,
+                        format,
+                        usage,
+                        view_formats: &[],
+                    })
+                    .create_view(&Default::default())
+            };
+            let color = texture(
+                "Scaled world",
+                self.format,
+                wgpu::TextureUsages::RENDER_ATTACHMENT | wgpu::TextureUsages::TEXTURE_BINDING,
+            );
+            let depth = texture(
+                "Scaled world depth",
+                wgpu::TextureFormat::Depth32Float,
+                wgpu::TextureUsages::RENDER_ATTACHMENT,
+            );
+            let group = device.create_bind_group(&wgpu::BindGroupDescriptor {
+                label: Some("Horizon post"),
+                layout: &self.layout,
+                entries: &[
+                    wgpu::BindGroupEntry {
+                        binding: 0,
+                        resource: wgpu::BindingResource::TextureView(&color),
+                    },
+                    wgpu::BindGroupEntry {
+                        binding: 1,
+                        resource: wgpu::BindingResource::Sampler(&self.sampler),
+                    },
+                ],
+            });
+            self.target = Some(WorldTarget {
+                size,
+                color,
+                depth,
+                group,
+            });
+        }
+        self.target
+            .as_ref()
+            .map(|t| (t.color.clone(), t.depth.clone()))
+    }
+    /// Draw the scaled world onto `screen`.
+    pub fn finish(&self, encoder: &mut wgpu::CommandEncoder, screen: &wgpu::TextureView) {
+        let Some(target) = &self.target else { return };
+        let attachments = [Some(wgpu::RenderPassColorAttachment {
+            view: screen,
+            resolve_target: None,
+            depth_slice: None,
+            ops: wgpu::Operations {
+                load: wgpu::LoadOp::Clear(wgpu::Color::BLACK),
+                store: wgpu::StoreOp::Store,
+            },
+        })];
+        let mut pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+            label: Some("Horizon post"),
+            color_attachments: &attachments,
+            ..Default::default()
+        });
+        pass.set_pipeline(if self.antialias {
+            &self.fxaa
+        } else {
+            &self.copy
+        });
+        pass.set_bind_group(0, &target.group, &[]);
+        pass.draw(0..3, 0..1);
+    }
+}

crates/horizon-client/src/graphics.rs

@@ -0,0 +1,320 @@
+//! Horizon's own graphics settings, beyond vanilla's options: kept in
+//! `horizon-graphics.txt` next to `options.txt` so that file stays exactly
+//! vanilla's. Every default reproduces vanilla's rendering; only choices the
+//! player makes here depart from it.
+use std::{fs, path::Path};
+
+pub const FILE: &str = "horizon-graphics.txt";
+
+/// Simple-level presets. `Custom` leaves every option as the player set it.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+pub enum Preset {
+    Performance,
+    Balanced,
+    Quality,
+    Ultra,
+    #[default]
+    Custom,
+}
+impl Preset {
+    pub const ALL: [Preset; 5] = [
+        Preset::Performance,
+        Preset::Balanced,
+        Preset::Quality,
+        Preset::Ultra,
+        Preset::Custom,
+    ];
+    pub fn name(self) -> &'static str {
+        match self {
+            Preset::Performance => "performance",
+            Preset::Balanced => "balanced",
+            Preset::Quality => "quality",
+            Preset::Ultra => "ultra",
+            Preset::Custom => "custom",
+        }
+    }
+    pub fn label(self) -> &'static str {
+        match self {
+            Preset::Performance => "Performance",
+            Preset::Balanced => "Balanced",
+            Preset::Quality => "Quality",
+            Preset::Ultra => "Ultra",
+            Preset::Custom => "Custom",
+        }
+    }
+    fn parse(s: &str) -> Self {
+        Self::ALL
+            .into_iter()
+            .find(|p| p.name() == s)
+            .unwrap_or_default()
+    }
+}
+
+/// How the swapchain presents frames.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+pub enum PresentMode {
+    /// Follow vanilla's VSync option (Mailbox or Fifo on, Immediate off).
+    #[default]
+    Auto,
+    Fifo,
+    Mailbox,
+    Immediate,
+}
+impl PresentMode {
+    pub const ALL: [PresentMode; 4] = [
+        PresentMode::Auto,
+        PresentMode::Fifo,
+        PresentMode::Mailbox,
+        PresentMode::Immediate,
+    ];
+    pub fn name(self) -> &'static str {
+        match self {
+            PresentMode::Auto => "auto",
+            PresentMode::Fifo => "fifo",
+            PresentMode::Mailbox => "mailbox",
+            PresentMode::Immediate => "immediate",
+        }
+    }
+    pub fn label(self) -> &'static str {
+        match self {
+            PresentMode::Auto => "Auto (VSync)",
+            PresentMode::Fifo => "FIFO",
+            PresentMode::Mailbox => "Mailbox",
+            PresentMode::Immediate => "Immediate",
+        }
+    }
+    fn parse(s: &str) -> Self {
+        Self::ALL
+            .into_iter()
+            .find(|p| p.name() == s)
+            .unwrap_or_default()
+    }
+}
+
+/// What the frame limiter does in the last half millisecond before a frame.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+pub enum Pacing {
+    /// Sleep the whole wait: no CPU spent spinning, a little less precise.
+    #[default]
+    Efficient,
+    /// Vanilla's `FramerateLimiter`: sleep, then spin until the deadline.
+    Precise,
+}
+
+/// The performance overlay drawn over the HUD.
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
+pub enum Overlay {
+    #[default]
+    Off,
+    /// Frames per second and frame time.
+    Fps,
+    /// The numbers and a graph of recent frame times.
+    Graph,
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct Graphics {
+    pub preset: Preset,
+    /// Skip sections hidden behind closed ones (vanilla's occlusion graph).
+    pub cave_culling: bool,
+    /// Meshed sections uploaded per frame; 0 uploads all that are ready.
+    pub chunk_updates: u32,
+    /// Section mesh bytes uploaded per frame, in KiB; 0 is unlimited.
+    pub upload_budget_kib: u32,
+    pub sky: bool,
+    pub fog: bool,
+    pub weather: bool,
+    pub animated_textures: bool,
+    pub present_mode: PresentMode,
+    pub pacing: Pacing,
+    /// Chunk worker threads; 0 uses every core but one. Applies at the next start.
+    pub workers: u32,
+    pub overlay: Overlay,
+    /// World resolution as a percentage of the window's (50..=200).
+    pub resolution_scale: u32,
+    /// FXAA over the world.
+    pub fxaa: bool,
+    /// The settings level last shown: Advanced, or Simple.
+    pub advanced: bool,
+}
+impl Default for Graphics {
+    fn default() -> Self {
+        Self {
+            preset: Preset::Custom,
+            cave_culling: true,
+            chunk_updates: 0,
+            upload_budget_kib: 0,
+            sky: true,
+            fog: true,
+            weather: true,
+            animated_textures: true,
+            present_mode: PresentMode::Auto,
+            pacing: Pacing::Efficient,
+            workers: 0,
+            overlay: Overlay::Off,
+            resolution_scale: 100,
+            fxaa: false,
+            advanced: false,
+        }
+    }
+}
+fn bool_text(v: bool) -> &'static str {
+    if v { "true" } else { "false" }
+}
+impl Graphics {
+    pub fn load(dir: &Path) -> Self {
+        fs::read_to_string(dir.join(FILE))
+            .map(|t| Self::parse(&t))
+            .unwrap_or_default()
+    }
+    pub fn parse(text: &str) -> Self {
+        let mut g = Self::default();
+        for line in text.lines() {
+            let Some((key, value)) = line.split_once(':') else {
+                continue;
+            };
+            let value = value.trim();
+            let flag = |d: bool| match value {
+                "true" => true,
+                "false" => false,
+                _ => d,
+            };
+            let number = |d: u32| value.parse().unwrap_or(d);
+            match key.trim() {
+                "preset" => g.preset = Preset::parse(value),
+                "caveCulling" => g.cave_culling = flag(g.cave_culling),
+                "chunkUpdates" => g.chunk_updates = number(g.chunk_updates).min(512),
+                "uploadBudgetKiB" => g.upload_budget_kib = number(g.upload_budget_kib).min(65536),
+                "sky" => g.sky = flag(g.sky),
+                "fog" => g.fog = flag(g.fog),
+                "weather" => g.weather = flag(g.weather),
+                "animatedTextures" => g.animated_textures = flag(g.animated_textures),
+                "presentMode" => g.present_mode = PresentMode::parse(value),
+                "framePacing" => {
+                    g.pacing = if value == "precise" {
+                        Pacing::Precise
+                    } else {
+                        Pacing::Efficient
+                    }
+                }
+                "workers" => g.workers = number(g.workers).min(64),
+                "resolutionScale" => g.resolution_scale = number(g.resolution_scale).clamp(50, 200),
+                "fxaa" => g.fxaa = flag(g.fxaa),
+                "level" => g.advanced = value == "advanced",
+                "overlay" => {
+                    g.overlay = match value {
+                        "fps" => Overlay::Fps,
+                        "graph" => Overlay::Graph,
+                        _ => Overlay::Off,
+                    }
+                }
+                _ => {}
+            }
+        }
+        g
+    }
+    pub fn serialize(&self) -> String {
+        format!(
+            "preset:{}\ncaveCulling:{}\nchunkUpdates:{}\nuploadBudgetKiB:{}\nsky:{}\nfog:{}\nweather:{}\nanimatedTextures:{}\npresentMode:{}\nframePacing:{}\nworkers:{}\noverlay:{}\nresolutionScale:{}\nfxaa:{}\nlevel:{}\n",
+            self.preset.name(),
+            bool_text(self.cave_culling),
+            self.chunk_updates,
+            self.upload_budget_kib,
+            bool_text(self.sky),
+            bool_text(self.fog),
+            bool_text(self.weather),
+            bool_text(self.animated_textures),
+            self.present_mode.name(),
+            match self.pacing {
+                Pacing::Efficient => "efficient",
+                Pacing::Precise => "precise",
+            },
+            self.workers,
+            match self.overlay {
+                Overlay::Off => "off",
+                Overlay::Fps => "fps",
+                Overlay::Graph => "graph",
+            },
+            self.resolution_scale,
+            bool_text(self.fxaa),
+            if self.advanced { "advanced" } else { "simple" },
+        )
+    }
+    pub fn save(&self, dir: &Path) {
+        let _ = fs::write(dir.join(FILE), self.serialize());
+    }
+    /// Worker threads for chunk generation and meshing.
+    pub fn worker_threads(&self) -> usize {
+        if self.workers > 0 {
+            return self.workers as usize;
+        }
+        std::thread::available_parallelism()
+            .map_or(2, |n| n.get())
+            .saturating_sub(1)
+            .max(1)
+    }
+}
+
+/// A preset's values for vanilla's options and Horizon's own.
+pub fn apply_preset(preset: Preset, s: &mut crate::settings::Settings) {
+    let (rd, sim, clouds, particles, shadows, blend, mipmaps, entity, leaves, weather_r) =
+        match preset {
+            Preset::Performance => (8, 6, "false", 2, false, 0, 0, 0.5, false, 3),
+            Preset::Balanced => (12, 8, "fast", 1, true, 1, 2, 0.75, true, 5),
+            Preset::Quality => (16, 12, "true", 0, true, 2, 4, 1.0, true, 10),
+            Preset::Ultra => (24, 12, "true", 0, true, 3, 4, 1.5, true, 10),
+            Preset::Custom => return,
+        };
+    s.render_distance = rd;
+    s.simulation_distance = sim;
+    s.clouds = clouds.into();
+    s.particles = particles;
+    s.entity_shadows = shadows;
+    s.biome_blend = blend;
+    s.mipmap_levels = mipmaps;
+    s.entity_distance = entity;
+    s.cutout_leaves = leaves;
+    s.weather_radius = weather_r;
+    s.graphics_preset = "custom".into();
+    let g = &mut s.horizon;
+    g.preset = preset;
+    g.cave_culling = true;
+    g.animated_textures = preset != Preset::Performance;
+    g.chunk_updates = 0;
+    g.upload_budget_kib = 0;
+    g.sky = true;
+    g.fog = true;
+    g.weather = true;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn round_trips() {
+        let g = Graphics {
+            preset: Preset::Balanced,
+            cave_culling: false,
+            chunk_updates: 12,
+            upload_budget_kib: 4096,
+            sky: false,
+            fog: false,
+            weather: false,
+            animated_textures: false,
+            present_mode: PresentMode::Mailbox,
+            pacing: Pacing::Precise,
+            workers: 6,
+            overlay: Overlay::Graph,
+            resolution_scale: 75,
+            fxaa: true,
+            advanced: true,
+        };
+        assert_eq!(Graphics::parse(&g.serialize()), g);
+        assert_eq!(Graphics::parse(""), Graphics::default());
+        assert_eq!(
+            Graphics::parse("workers:abc\nsky:maybe\n"),
+            Graphics::default()
+        );
+    }
+}