Launcher: java_launch's Windows paths, one part at a time

The log config and old versions' asset folder were joined from
"a/b" strings; on Windows their tests compared those mixed
separators with paths joined part by part. Join them part by part.

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

.claude/skills/vanilla-parity/SKILL.md

@@ -1,76 +0,0 @@
----
-name: vanilla-parity
-description: Fix a Horizon bug or gap so it behaves 1:1 like vanilla 26.3, starting from the port ledger (tools/port_ledger.py) instead of grepping. Use for any issue, Discord report or PR that makes Horizon match vanilla: "X doesn't work like in Java", a missing sound, particle, animation, mob behaviour, block rule, screen or packet.
----
-
-# Vanilla parity with the port ledger
-
-The port ledger pairs every vanilla method with the Rust fn that ports it (or says it is missing, or needs
-no port) and lists where a port isn't wired like vanilla. Ask it first; grep only for what it can't answer.
-Full reference: `docs/port-ledger.md`.
-
-## 0. Have a fresh ledger
-
-```sh
-python3 tools/port_ledger.py build          # ~20 s; again after pulling main
-```
-
-It needs the vanilla jar (the launcher's `versions/26.3/26.3.jar`, or `--jar`) and/or the lab's decompiled
-sources (`python3 tools/lab.py decompile`, or `--sources DIR`). If `build` says it has no vanilla code, run
-the lab first; don't guess vanilla from memory.
-
-## 1. From the report to the code
-
-```sh
-python3 tools/port_ledger.py issue 3236                      # a GitHub issue number
-python3 tools/port_ledger.py issue "mooshroom stays red after lightning"   # or the report's text
-```
-
-It ranks the vanilla classes the report names and lists, per class, its Rust home files, where each method is
-ported, and the known gaps (`missing` rows from the verdict map, seam/client/drift gaps). Often the cause is
-already written there ("Type is not saved"). Then drill in:
-
-```sh
-python3 tools/port_ledger.py where MushroomCow.readAdditionalSaveData   # ports, callers, callees, gaps
-python3 tools/port_ledger.py class MushroomCow                          # every method: where, or missing
-python3 tools/port_ledger.py what crates/horizon-client/src/mobs/farm.rs:120   # which vanilla method a fn ports
-```
-
-A ledger answer is a lead, not a verdict: about 1 in 12 map rows is wrong. Read the vanilla method (path and
-line are in the output) and the Rust fn before changing anything.
-
-## 2. Port it the vanilla way
-
-- Translate the vanilla method, don't reinvent it: same order of operations, same constants, the same random
-  draws in the same order (`horizon_core::random`), Java `Math` through `horizon_core::jmath`.
-- Open the fn's doc with the vanilla method it ports: `` /// `MushroomCow.readAdditionalSaveData`: ... ``.
-  That one line is what makes the next agent find it.
-- Fix the path players run: single player is a client of the integrated server, so server logic lives in
-  `game/lan*.rs` and `src/lan/`, and what only the client's copy shows (particles, local sounds, hand
-  animation) must be reached from `game/remote*.rs`.
-- Look at the neighbours the ledger lists for the same class: a `client` or `seam` gap next to your fix is
-  usually the same bug on the other path.
-
-## 3. Before the PR
-
-```sh
-python3 tools/port_ledger.py check --base origin/main
-```
-
-It lists the ports your branch touches with their open gaps, citations to add, stale citations, and (against
-the base) the gaps the branch closes and opens. Close what belongs to your fix, cite what you ported, leave
-no new stale citation. If you ported a method the verdict map called `missing`, change its row in
-`tools/port_map/*.tsv` to `port` with the fn (`file.rs::Owner::fn`) and run
-`python3 tools/port_ledger.py map-check tools/port_map/<file>.tsv`.
-
-Then the usual: the harness for the area (`docs/architecture.md`), `cargo check`/tests per `AGENTS.md`, and
-a small PR that says which vanilla method it now matches.
-
-## Finding work
-
-```sh
-python3 tools/port_ledger.py gaps --kind seam      # ported on two paths, wired on one: the best leads
-python3 tools/port_ledger.py gaps --kind client    # client-only effects the server path never reaches
-python3 tools/port_ledger.py gaps --kind drift     # a port missing a sound, particle, item or constant
-rg -n "player:" tools/port_map/*.tsv               # missing behaviour a player would see
-```

.github/actionlint.yaml

@@ -1,4 +1,3 @@
 self-hosted-runner:
   # The Mac mini's runner (ludovics-mac-mini), which holds the maintainer's own Minecraft files.
-  # windows-11-vs2026-arm is GitHub's Windows ARM64 image (2026-08), newer than actionlint's label list.
-  labels: [horizon-game, ludovics-mac-mini, windows-11-vs2026-arm]
+  labels: [horizon-game, ludovics-mac-mini]

.github/pull_request_template.md

@@ -1,32 +1,12 @@
-<!-- Opened by an AI agent? First line: "> 🤖 Opened by <your GitHub login>'s AI agent (<tool, model>), not by <your GitHub login> personally." Use your own login, not someone else's. -->
-
 ## What and why
 
 <!-- What this changes, and why. Link the issue it fixes ("Fixes #123"). -->
 
-## Kind
-
-<!-- Tick one: it sets the pull request's label (CONTRIBUTING.md "Pull requests"). -->
-
-- [ ] parity: Horizon now does what vanilla 26.3 does
-- [ ] bug: a crash or a breakage
-- [ ] perf: faster, or less memory
-- [ ] feature: something new for players (listed under New in the release notes)
-- [ ] extra: Horizon-only, off by default
-- [ ] tooling: tools, CI, tests, harnesses
-- [ ] docs
-
 ## Vanilla reference
 
 <!-- The vanilla classes and methods this follows (tools/rea_vanilla.py), and the harness that checks it.
      "Horizon-only" for a feature vanilla doesn't have; "none" for tooling or docs. -->
 
-## Other projects' code
-
-<!-- "none", or for each project you read or copied from: its link at the commit, its license (only MIT,
-     BSD-2-Clause, BSD-3-Clause, Apache-2.0, ISC, zlib, 0BSD, MIT-0, Unlicense or CC0-1.0), and what you took.
-     CONTRIBUTING.md "Only original code". -->
-
 ## Self-check
 
 <!-- Paste the block `python3 tools/pr_ready.py` prints (`--base upstream/main` from a fork). -->

.github/trusted-reviewers.txt

@@ -7,4 +7,3 @@ kacpherek    # added by Ludovic, 2026-10-27
 rdbtCVS      # added by Ludovic, 2026-10-27
 Online5277   # added by Ludovic, 2026-10-27 (his top three by merged pull requests)
 levzzz5154   # added by Ludovic, 2026-10-28 (Horizon Team; author of horizon-mixins)
-Qwerner88880 # added by Ludovic, 2026-10-31 (Discord vladislav_hagen; native-mod hooks)

.github/workflows/cancel-on-close.yml

@@ -9,23 +9,19 @@ permissions:
   actions: write
 jobs:
   cancel:
-    # One of our small runners (horizon-light), out of GitHub's pool: no checkout, no code of the pull request
-    # (docs/ci-runners.md). SELF_HOSTED_CI=off: GitHub's runners.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     steps:
       - name: Cancel the pull request's unfinished runs
         env:
           GH_TOKEN: ${{ github.token }}
           REPO: ${{ github.repository }}
           BRANCH: ${{ github.event.pull_request.head.ref }}
-          HEAD_REPO: ${{ github.event.pull_request.head.repo.full_name }}
+          SHA: ${{ github.event.pull_request.head.sha }}
         run: |
-          # Every head the pull request had, not only its last: a run-parity label added on an older head left that
-          # run queued after the merge (#3104, 2026-10-29). Its branch in its own repository names its runs (another
-          # fork can have a branch of the same name).
           for status in queued in_progress waiting pending requested; do
-            gh api -X GET "repos/$REPO/actions/runs" -f branch="$BRANCH" -f event=pull_request -f status="$status" \
-              -f per_page=100 --jq ".workflow_runs[] | select(.head_repository.full_name == \"$HEAD_REPO\") | .id"
+            gh run list -R "$REPO" --branch "$BRANCH" --status "$status" --limit 100 \
+              --json databaseId,event,headSha \
+              -q ".[] | select(.event == \"pull_request\" and .headSha == \"$SHA\") | .databaseId"
           done | sort -u | while read -r id; do
             gh run cancel -R "$REPO" "$id" || true
           done

.github/workflows/cargo-horizon-mod.yml

@@ -1,107 +0,0 @@
-name: cargo-horizon-mod
-# `cargo binstall --git https://github.com/horizon-rust/horizon cargo-horizon-mod` (#2120): binstall reads
-# [package.metadata.binstall] from crates/cargo-horizon-mod/Cargo.toml and downloads the archive this workflow
-# attaches to the tag `cargo-horizon-mod-v<version>`, whose version must be the manifest's. The targets come from
-# tools/horizon_mod_binstall.py, the same file the manifest's template is checked against, so a platform added there
-# is built here and one nobody publishes is caught before it ships. A pull request builds the archives and publishes
-# nothing.
-on:
-  push:
-    tags: ['cargo-horizon-mod-v*']
-  pull_request:
-    paths:
-      - 'crates/cargo-horizon-mod/**'
-      - 'tools/horizon_mod_binstall.py'
-      - '.github/workflows/cargo-horizon-mod.yml'
-permissions:
-  contents: read
-jobs:
-  plan:
-    runs-on: ubuntu-latest
-    timeout-minutes: 5
-    outputs:
-      platforms: ${{ steps.platforms.outputs.platforms }}
-    steps:
-      - uses: actions/checkout@v7
-      - id: platforms
-        run: echo "platforms=$(python3 -c 'import json, tools.horizon_mod_binstall as m; print(json.dumps(m.PLATFORMS))')" >> "$GITHUB_OUTPUT"
-  build:
-    needs: plan
-    name: build ${{ matrix.target }}
-    strategy:
-      fail-fast: false
-      matrix:
-        include: ${{ fromJSON(needs.plan.outputs.platforms) }}
-    runs-on: ${{ matrix.os }}
-    timeout-minutes: 30
-    steps:
-      - uses: actions/checkout@v7
-      - uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: ${{ matrix.target }}
-      - name: The aarch64 Linux linker
-        if: matrix.target == 'aarch64-unknown-linux-gnu'
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y gcc-aarch64-linux-gnu
-          echo "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc" >> "$GITHUB_ENV"
-      - name: Build
-        run: cargo build --release --locked -p cargo-horizon-mod --target ${{ matrix.target }}
-      - name: It starts
-        if: matrix.run
-        shell: bash
-        run: |
-          set -euo pipefail
-          binary="target/${{ matrix.target }}/release/cargo-horizon-mod"
-          [ -f "$binary.exe" ] && binary="$binary.exe"
-          out=$("$binary" 2>&1 || true)
-          case "$out" in
-            *"usage: cargo horizon-mod"*) ;;
-            *) echo "$out"; echo "::error::$binary does not start"; exit 1 ;;
-          esac
-      - name: Package
-        shell: bash
-        run: |
-          set -euo pipefail
-          binary="target/${{ matrix.target }}/release/cargo-horizon-mod"
-          [ -f "$binary.exe" ] && binary="$binary.exe"
-          mkdir -p dist
-          tar -czf "dist/$(basename "$binary" | sed 's/\.exe$//')-${{ matrix.target }}.tar.gz" -C "$(dirname "$binary")" "$(basename "$binary")"
-      - uses: actions/upload-artifact@v7
-        with:
-          name: cargo-horizon-mod-${{ matrix.target }}
-          path: dist/*.tar.gz
-          if-no-files-found: error
-          retention-days: 3
-  publish:
-    needs: build
-    if: startsWith(github.ref, 'refs/tags/')
-    runs-on: ubuntu-latest
-    timeout-minutes: 10
-    permissions:
-      contents: write
-    steps:
-      - uses: actions/checkout@v7
-      - uses: actions/download-artifact@v8
-        with:
-          pattern: cargo-horizon-mod-*
-          path: dist
-          merge-multiple: true
-      - name: The tag and the manifest name the same release and archives
-        run: python3 tools/horizon_mod_binstall.py dist "$GITHUB_REF_NAME"
-      - name: Checksums
-        run: |
-          set -euo pipefail
-          cd dist
-          for file in *.tar.gz; do sha256sum "$file" | cut -d' ' -f1 > "$file.sha256"; done
-      - name: Publish
-        env:
-          GH_TOKEN: ${{ github.token }}
-        run: |
-          set -euo pipefail
-          notes="\`cargo binstall --git https://github.com/horizon-rust/horizon cargo-horizon-mod\`"
-          if gh release view "$GITHUB_REF_NAME" >/dev/null 2>&1; then
-            gh release upload "$GITHUB_REF_NAME" dist/* --clobber
-          else
-            gh release create "$GITHUB_REF_NAME" dist/* --latest=false --title "cargo-horizon-mod ${GITHUB_REF_NAME#cargo-horizon-mod-v}" --notes "$notes"
-          fi

.github/workflows/ci.yml

@@ -24,28 +24,14 @@ env:
   HORIZON_TELEMETRY_URL: "off"
 
 jobs:
-  # One job, not one per check: each job takes a runner from the organisation's shared pool, and with every pull request
-  # and every merge to main starting this workflow, three jobs a run left the pool's queue tens of minutes deep.
-  #
-  # Where (docs/ci-runners.md): our checks runners (label horizon-checks: the desktop's, an isolated user, so a fork's
-  # pull request runs there too) take the pull requests whose number ends in 0 or 1, about what their three runners
-  # can do; GitHub's runners take the others and main's pushes (which also save the Rust cache GitHub's pull request
-  # runs read), so both pools work at once. The repository variable SELF_HOSTED_CI moves them: `all` every job to
-  # ours, `light` (the desktop paused) or `off` every job to GitHub's. On ours the build folder persists
-  # (CARGO_TARGET_DIR, outside the checkout), so the apt packages, Python and the Rust cache steps are GitHub's only.
   verify:
-    runs-on: >-
-      ${{ vars.SELF_HOSTED_CI != 'off' && vars.SELF_HOSTED_CI != 'light' && (vars.SELF_HOSTED_CI == 'all' ||
-      github.event_name == 'pull_request' && (endsWith(format('{0}', github.event.pull_request.number), '0') ||
-      endsWith(format('{0}', github.event.pull_request.number), '1'))) &&
-      fromJSON('["self-hosted", "linux", "horizon-checks"]') || 'ubuntu-latest' }}
-    timeout-minutes: 45
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: actions/setup-python@v7
-        if: runner.environment == 'github-hosted'
+      - uses: actions/setup-python@v5
         with:
           python-version: '3.12'
       - name: Does this pull request need Rust checks?
@@ -55,43 +41,20 @@ jobs:
           BASE_SHA: ${{ github.event.pull_request.base.sha }}
           HEAD_SHA: ${{ github.event.pull_request.head.sha }}
         run: python3 tools/ci/rust_changes.py "$BASE_SHA" "$HEAD_SHA" >> "$GITHUB_OUTPUT"
-      # A pull request adds only its own commits to main, so it reads those; main's pushes read every ref's history.
       - name: Keep game artifacts out of Git
-        env:
-          EVENT: ${{ github.event_name }}
-          BASE_SHA: ${{ github.event.pull_request.base.sha }}
-          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
         run: |
           python tools/check_public_tree.py
-          if [ "$EVENT" = pull_request ]; then
-            python tools/check_public_tree.py --range "$BASE_SHA..$HEAD_SHA"
-          else
-            python tools/check_public_tree.py --history
-          fi
-      # Our runners as GitHub's: some Python tests compile Rust with a bare `rustc` (GitHub's image has a default
-      # toolchain, our runners' own rustup homes may not), and the GPU tests find no adapter there, so they return
-      # early. Ours have Mesa's software Vulkan for parity; a backend Linux lacks keeps the tests from it, so a pull
-      # request's verify doesn't depend on which pool took it (#8627: a GPU test that flakes on lavapipe).
-      - name: Our runners as GitHub's (a default Rust toolchain, no GPU)
-        if: runner.environment != 'github-hosted'
-        run: |
-          rustup toolchain install stable --profile minimal --component rustfmt --component clippy
-          rustup default stable
-          echo "WGPU_BACKEND=dx12" >> "$GITHUB_ENV"
+          python tools/check_public_tree.py --history
       - name: Test offline research tooling
         run: python -m unittest discover -s tests -v
       - name: Install Rust toolchain and the ALSA and udev headers the client links against
         if: steps.rust.outputs.required != 'false'
-        env:
-          HOSTED: ${{ runner.environment == 'github-hosted' }}
         run: |
-          if [ "$HOSTED" = true ]; then
-            sudo apt-get update && sudo apt-get install -y --no-install-recommends libasound2-dev libudev-dev
-          fi
-          rustup toolchain install stable --profile minimal --component rustfmt --component clippy
+          sudo apt-get update && sudo apt-get install -y --no-install-recommends libasound2-dev libudev-dev
+          rustup toolchain install stable --profile minimal --component rustfmt --component clippy --target wasm32-unknown-unknown
       # Dependencies and the workspace's own build, saved from main's runs (pull requests read main's cache).
       - uses: Swatinem/rust-cache@v2
-        if: steps.rust.outputs.required != 'false' && runner.environment == 'github-hosted'
+        if: steps.rust.outputs.required != 'false'
         with:
           shared-key: verify
           save-if: ${{ github.ref == 'refs/heads/main' }}
@@ -99,34 +62,28 @@ jobs:
         if: steps.rust.outputs.required != 'false'
         run: |
           cargo +stable fmt --all -- --check
-          cargo +stable clippy --workspace --all-targets -- -D warnings
+          # With the game's code mods (on in every release build, off by default).
+          cargo +stable clippy --workspace --all-targets --features horizon-client/mods -- -D warnings
           # The server build (released as horizon-engine): the game without sound or controllers.
           cargo +stable clippy -p horizon-client --all-targets --no-default-features -- -D warnings
       # Libraries, binaries and integration tests, then doc tests: not the ~275 examples, which clippy above already
       # type-checks and the parity job builds and runs (they were most of this step's build and link time).
-      # cargo test, not nextest: nextest's process per test reloads each binary's shared tables for every test, and on
-      # these 4-core runners it was no faster (#4978).
       - name: Test Rust core and voxel kernel correctness
         if: steps.rust.outputs.required != 'false'
         run: |
-          cargo +stable test --workspace --lib --bins --tests
+          cargo +stable test --workspace --lib --bins --tests --features horizon-client/mods,horizon-mods/pack
           # The full content-root tests (#[ignore]d: minutes each on a laptop). The same build as above; they need the
-          # prepared vanilla data, so without it they pass at once. Keep the target selection identical to avoid
-          # recompiling the workspace with a different dependency graph.
-          cargo +stable test --workspace --lib --bins --tests mod_content::tests:: -- --ignored
-          cargo +stable test --workspace --doc
+          # prepared vanilla data, so without it they pass at once.
+          cargo +stable test --workspace --lib --features horizon-client/mods,horizon-mods/pack mod_content::tests:: -- --ignored
+          cargo +stable test --workspace --doc --features horizon-client/mods,horizon-mods/pack
   # The launcher is its own workspace (launcher/Cargo.toml), so verify's cargo runs never build it. A pull request that
   # changes it or a crate it builds is checked here, and so is every push to main: two pull requests can each pass
   # alone and break it together (#2059 and the registry ratings did, 2026-10-26).
   launcher:
-    runs-on: >-
-      ${{ vars.SELF_HOSTED_CI != 'off' && vars.SELF_HOSTED_CI != 'light' && (vars.SELF_HOSTED_CI == 'all' ||
-      github.event_name == 'pull_request' && (endsWith(format('{0}', github.event.pull_request.number), '0') ||
-      endsWith(format('{0}', github.event.pull_request.number), '1'))) &&
-      fromJSON('["self-hosted", "linux", "horizon-checks"]') || 'ubuntu-latest' }}
-    timeout-minutes: 45
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Does this pull request change the launcher or a crate it builds?
@@ -138,16 +95,12 @@ jobs:
         run: python3 tools/ci/rust_changes.py --launcher "$BASE_SHA" "$HEAD_SHA" >> "$GITHUB_OUTPUT"
       - name: Install Rust and the headers GPUI links against
         if: steps.launcher.outputs.required != 'false'
-        env:
-          HOSTED: ${{ runner.environment == 'github-hosted' }}
         run: |
-          if [ "$HOSTED" = true ]; then
-            sudo apt-get update && sudo apt-get install -y --no-install-recommends libxkbcommon-x11-dev libwayland-dev \
-              libx11-xcb-dev libfontconfig-dev libvulkan-dev libasound2-dev libudev-dev
-          fi
+          sudo apt-get update && sudo apt-get install -y --no-install-recommends libxkbcommon-x11-dev libwayland-dev \
+            libx11-xcb-dev libfontconfig-dev libvulkan-dev libasound2-dev libudev-dev
           rustup toolchain install stable --profile minimal --component rustfmt --component clippy
       - uses: Swatinem/rust-cache@v2
-        if: steps.launcher.outputs.required != 'false' && runner.environment == 'github-hosted'
+        if: steps.launcher.outputs.required != 'false'
         with:
           workspaces: launcher
           shared-key: launcher
@@ -158,101 +111,17 @@ jobs:
         run: |
           cargo +stable fmt --check
           cargo +stable clippy --all-targets --locked -- -D warnings
-          cargo +stable test --locked --lib --bins
-  # Compile and test Windows ARM64 on an actual ARM64 host, and inspect the resulting PE headers. By hand only
-  # (`gh workflow run checks --ref <branch>`): GitHub's runner queue is the bottleneck, and main's runs gate the
-  # releases (tools/release_train.py waits for them), so neither pull requests nor main's pushes start this
-  # 90-minute job. The Nightly and launcher releases build and check these binaries on every run.
-  windows-arm64:
-    name: Windows ARM64 game and launcher
-    if: github.event_name == 'workflow_dispatch'
-    runs-on: windows-11-vs2026-arm
-    timeout-minutes: 90
-    env:
-      RUSTFLAGS: -C target-feature=+crt-static
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          fetch-depth: 0
-      - name: Use every runner core for Cargo
-        shell: pwsh
-        run: |
-          $cores = (Get-CimInstance Win32_Processor | Measure-Object -Property NumberOfLogicalProcessors -Sum).Sum
-          "CARGO_BUILD_JOBS=$cores" >> $env:GITHUB_ENV
-      - uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: aarch64-pc-windows-msvc
-      - uses: Swatinem/rust-cache@v2
-        with:
-          shared-key: windows-arm64-game
-      - uses: Swatinem/rust-cache@v2
-        with:
-          workspaces: launcher
-          shared-key: windows-arm64-launcher
-      - name: Check LLVM assembler used by ring
-        shell: pwsh
-        run: |
-          $llvmBin = Join-Path $env:ProgramFiles 'LLVM\bin'
-          if (-not (Get-Command clang -ErrorAction SilentlyContinue) -and (Test-Path (Join-Path $llvmBin 'clang.exe'))) {
-            $env:PATH = "$llvmBin;$env:PATH"
-            "PATH=$env:PATH" >> $env:GITHUB_ENV
-          }
-          $clang = Get-Command clang -ErrorAction Stop
-          Write-Output "Using $($clang.Source)"
-          & $clang.Source --version
-      - name: Build the game for native Windows ARM64
-        run: cargo build --release --locked --target aarch64-pc-windows-msvc -p horizon-client -p horizon-client-lib --bin horizon-client --bin horizon-ctl -p horizon-prepare --bin horizon-prepare -p horizon-server --bin horizon-server
-      - name: Check the game's PE machine
-        run: python tools/check_pe_arch.py arm64 target/aarch64-pc-windows-msvc/release/horizon-client.exe target/aarch64-pc-windows-msvc/release/horizon-ctl.exe target/aarch64-pc-windows-msvc/release/horizon-prepare.exe target/aarch64-pc-windows-msvc/release/horizon-server.exe
-      - name: Check game DLL imports
-        run: python tools/check_imports.py target/aarch64-pc-windows-msvc/release/horizon-client.exe target/aarch64-pc-windows-msvc/release/horizon-ctl.exe target/aarch64-pc-windows-msvc/release/horizon-prepare.exe target/aarch64-pc-windows-msvc/release/horizon-server.exe
-      - name: Start every game executable
-        shell: pwsh
-        run: |
-          $ErrorActionPreference = 'Stop'
-          $client = 'target/aarch64-pc-windows-msvc/release/horizon-client.exe'
-          $output = & $client --help 2>&1
-          if ($LASTEXITCODE -ne 0 -or ($output -join "`n") -notmatch '--resources') { throw 'horizon-client --help failed' }
-          foreach ($binary in @('horizon-ctl.exe', 'horizon-prepare.exe', 'horizon-server.exe')) {
-            $path = "target/aarch64-pc-windows-msvc/release/$binary"
-            $output = & $path --help 2>&1
-            if ($LASTEXITCODE -ne 0 -or -not $output) { throw "$binary --help failed" }
-          }
-          foreach ($binary in @('horizon-prepare.exe', 'horizon-server.exe')) {
-            $path = "target/aarch64-pc-windows-msvc/release/$binary"
-            $output = & $path --version 2>&1
-            if ($LASTEXITCODE -ne 0 -or -not $output) { throw "$binary --version failed" }
-            Write-Output ($output -join "`n")
-          }
-      - name: Test and build the native Windows ARM64 launcher
-        working-directory: launcher
-        run: |
-          cargo test --release --locked --target aarch64-pc-windows-msvc --lib
-          cargo build --release --locked --target aarch64-pc-windows-msvc
-      - name: Check the launcher's PE machine
-        working-directory: launcher
-        run: python ../tools/check_pe_arch.py arm64 target/aarch64-pc-windows-msvc/release/horizon-launcher.exe
-      - name: Check launcher DLL imports and command-line startup
-        working-directory: launcher
-        shell: pwsh
-        run: |
-          $ErrorActionPreference = 'Stop'
-          $launcher = 'target/aarch64-pc-windows-msvc/release/horizon-launcher.exe'
-          python ../tools/check_imports.py $launcher
-          $output = & $launcher --version 2>&1
-          if ($LASTEXITCODE -ne 0 -or -not $output) { throw 'horizon-launcher --version failed' }
-          Write-Output ($output -join "`n")
+          cargo +stable test --locked --lib
   # Most pull requests leave the harnesses to parity-main, which runs them on main a batch of merges at a time
   # (.github/workflows/parity-main.yml; releases wait for it). A pull request still runs them itself when it changes
   # a harness, an oracle, a probe or the runner, or carries the run-parity label (run-parity.yml, when it is added).
   parity-scope:
     if: github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name == github.repository
-    # A git diff of this repository's own branch: one of our small runners (horizon-light, docs/ci-runners.md).
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     outputs:
       run: ${{ steps.scope.outputs.run }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
           fetch-depth: 0
@@ -287,13 +156,13 @@ jobs:
     if: github.event_name == 'workflow_dispatch'
     runs-on: [self-hosted, linux, horizon-game]
     steps:
-      - uses: actions/checkout@v7
-      - uses: actions/setup-python@v7
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: '3.12'
       - name: Install Rust toolchain
         run: rustup toolchain install stable --profile minimal
-      - uses: actions/setup-java@v6
+      - uses: actions/setup-java@v4
         with:
           distribution: temurin
           java-version: '25'
@@ -635,11 +504,11 @@ jobs:
     if: github.event_name == 'workflow_dispatch'
     runs-on: [self-hosted, linux, horizon-game]
     steps:
-      - uses: actions/checkout@v7
-      - uses: actions/setup-python@v7
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: '3.12'
-      - uses: actions/setup-java@v6
+      - uses: actions/setup-java@v4
         with:
           distribution: temurin
           java-version: '25'

.github/workflows/claim-command.yml

@@ -1,78 +0,0 @@
-name: claim command
-# `/claim` and `/unclaim` comments: anyone takes an issue before working on it, and a daily run releases the claims
-# older than 5 days that no open pull request links (CONTRIBUTING.md "Claim before you start",
-# tools/ci/claim_command.py).
-#
-# Why no pull request's code runs here, though the token can write:
-# - `issue_comment` and `schedule` always run this file from main, whoever comments and wherever.
-# - It checks out main's script and list only, never a pull request; it reads threads through the API.
-# - The comment's text and author reach the script as env vars, never in a shell line. The token stays in the step
-#   and can only write issues (assignees, comments, reactions).
-on:
-  issue_comment:
-    types: [created]
-  schedule:
-    - cron: "23 5 * * *"
-  workflow_dispatch:
-permissions:
-  contents: read
-jobs:
-  command:
-    # Every other comment skips here, before a runner starts. Pull requests are answered by the script.
-    if: >-
-      github.event_name == 'issue_comment' && github.event.comment.user.type != 'Bot' && (
-      startsWith(github.event.comment.body, '/claim') ||
-      startsWith(github.event.comment.body, '/unclaim') ||
-      startsWith(github.event.comment.body, '🤖 Agent: /claim') ||
-      startsWith(github.event.comment.body, '🤖 Agent: /unclaim'))
-    # One command per issue at a time, so two `/claim`s can't both find it free. On the job, not the workflow:
-    # the skipped runs of ordinary comments must not cancel a waiting one.
-    concurrency:
-      group: claim-${{ github.event.issue.number }}
-    # One of our small runners (horizon-light), out of GitHub's pool: main's script only (docs/ci-runners.md).
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
-    timeout-minutes: 5
-    permissions:
-      contents: read
-      issues: write
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          ref: main
-          persist-credentials: false
-          sparse-checkout: |
-            .github/trusted-reviewers.txt
-            tools/ci/nightly_set.py
-            tools/ci/claim_command.py
-          sparse-checkout-cone-mode: false
-      - name: Run the command
-        env:
-          GH_TOKEN: ${{ github.token }}
-          BODY: ${{ github.event.comment.body }}
-          AUTHOR: ${{ github.event.comment.user.login }}
-          ISSUE: ${{ github.event.issue.number }}
-          COMMENT_ID: ${{ github.event.comment.id }}
-          REPO: ${{ github.repository }}
-        run: python3 tools/ci/claim_command.py command
-  release:
-    if: github.event_name != 'issue_comment' && github.repository == 'horizon-rust/horizon'
-    # One of our small runners (horizon-light), out of GitHub's pool: main's script only (docs/ci-runners.md).
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
-    timeout-minutes: 10
-    permissions:
-      contents: read
-      issues: write
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          ref: main
-          persist-credentials: false
-          sparse-checkout: |
-            tools/ci/nightly_set.py
-            tools/ci/claim_command.py
-          sparse-checkout-cone-mode: false
-      - name: Release stale claims
-        env:
-          GH_TOKEN: ${{ github.token }}
-          REPO: ${{ github.repository }}
-        run: python3 tools/ci/claim_command.py release

.github/workflows/game-build.yml

@@ -1,7 +1,6 @@
 name: game build
-# Builds the game for every platform from `ref`: the Java exporters, then Linux and the Linux server, Windows x64
-# and ARM64 on GitHub, and macOS on the Mac mini's runner with a 1500-frame offscreen run of a new world (smoke-test.json): Apple
-# Silicon, and Intel cross-built there for x86_64-apple-darwin and checked under Rosetta 2 (#1161). Called by
+# Builds the game for every platform from `ref`: the Java exporters, then Linux and the Linux server and Windows on
+# GitHub, macOS on the Mac mini's runner with a 1500-frame offscreen run of a new world (smoke-test.json). Called by
 # release.yml (the releases) and nightly-build.yml (the opt-in Nightly), always from main's copy of this file: the
 # caller's commit, never the one being built. It holds no secrets: signing the checksums is the callers' own job,
 # which never runs what this one built. See docs/release-flow.md.
@@ -38,14 +37,13 @@ permissions:
 jobs:
   exporters:
     # This runner holds the maintainer's own pinned Minecraft jars. Only our classes leave it. An untrusted build
-    # goes to the Mac mini's nightly runner (macOS + horizon-nightly: ludovics-mac-mini-nightly, beside the one that
-    # runs pull requests' parity jobs, so a nightly never waits behind their queue), never the release runner
-    # (MAC_RUNNER: ludovics-mac-mini-release) nor parity-main's.
-    runs-on: ${{ inputs.trusted && vars.MAC_RUNNER || fromJSON('["self-hosted", "macOS", "horizon-nightly"]') }}
+    # goes to the Mac mini runner that already runs pull requests' parity jobs (macOS + horizon-game:
+    # ludovics-mac-mini), never the release runner (MAC_RUNNER: ludovics-mac-mini-release) nor parity-main's.
+    runs-on: ${{ inputs.trusted && vars.MAC_RUNNER || fromJSON('["self-hosted", "macOS", "horizon-game"]') }}
     # Three full preparations (two isolated, one batched) besides the compile.
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           ref: ${{ inputs.ref }}
           persist-credentials: false
@@ -73,7 +71,7 @@ jobs:
             ! \( -name '*.class' \( -path 'exporters/server/dev/horizonlab/parity/*' -o -path 'exporters/client/dev/horizonlab/parity/*' \) \))
           [ -z "$stray" ] || { echo "::error::not one of our classes: $stray"; exit 1; }
           python3 tools/check_prepare_exporters.py --binary target/release/horizon-prepare
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         with:
           name: original-exporters
           path: exporters/
@@ -83,10 +81,6 @@ jobs:
   build:
     needs: exporters
     name: build ${{ matrix.name }}
-    # Windows ARM64 and musl are new: a failure never holds the other platforms' release (the signing job
-    # needs this job, and a failed entry of it would fail it). The release steps leave the missing
-    # optional archives out with a warning.
-    continue-on-error: ${{ matrix.name == 'windows-arm64' || matrix.name == 'linux-musl' }}
     strategy:
       fail-fast: false
       matrix:
@@ -98,40 +92,18 @@ jobs:
             # The server build too: packaging/server/install.sh installs it on Linux.
             server_dir: horizon-server-linux-x86_64
             server_asset: horizon-server-linux-x86_64.tar.gz
-          - name: linux-musl
-            os: ubuntu-22.04
-            musl: true
-            dir: horizon-linux-musl-x86_64
-            asset: horizon-linux-musl-x86_64.tar.gz
           - name: windows
             os: windows-latest
             dir: horizon-windows-x64
             asset: horizon-windows-x64.zip
             exe: .exe
-            pe_arch: x64
             # The C runtime linked in, so the game runs without the Visual C++ redistributable.
             rustflags: -C target-feature=+crt-static
-          - name: windows-arm64
-            os: windows-11-vs2026-arm
-            target: aarch64-pc-windows-msvc
-            dir: horizon-windows-arm64
-            asset: horizon-windows-arm64.zip
-            exe: .exe
-            pe_arch: arm64
-            # The ARM64 runner builds and runs native ARM64 executables; keep the C runtime in the archive.
-            rustflags: -C target-feature=+crt-static
           - name: macos
             mac: true
             dir: horizon-macos-arm64
             asset: horizon-macos-arm64.zip
-          # Intel Macs: built on the same runner for another target; its checks and smoke test run the x86_64
-          # programs under Rosetta 2.
-          - name: macos-x64
-            mac: true
-            target: x86_64-apple-darwin
-            dir: horizon-macos-x64
-            asset: horizon-macos-x64.zip
-    runs-on: ${{ matrix.mac && (inputs.trusted && vars.MAC_RUNNER || fromJSON('["self-hosted", "macOS", "horizon-nightly"]')) || matrix.os }}
+    runs-on: ${{ matrix.mac && (inputs.trusted && vars.MAC_RUNNER || fromJSON('["self-hosted", "macOS", "horizon-game"]')) || matrix.os }}
     # Notarizing the zip can take a few minutes.
     timeout-minutes: ${{ matrix.mac && 60 || 40 }}
     env:
@@ -141,13 +113,11 @@ jobs:
       HORIZON_VERSION: ${{ inputs.version }}
       # A nightly's date and commit ("2026-10-28 0c02067"), which the game shows; empty for a release.
       HORIZON_NIGHTLY: ${{ inputs.nightly }}
-      # Where cargo puts the programs: target/release, or target/<target>/release for another target.
-      BIN: ${{ matrix.target && format('target/{0}/release', matrix.target) || 'target/release' }}
     defaults:
       run:
         shell: bash
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           ref: ${{ inputs.ref }}
           persist-credentials: false
@@ -157,32 +127,23 @@ jobs:
           # keeps its preparations outside the checkout.
           clean: true
       - uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: ${{ matrix.target }}
       - uses: Swatinem/rust-cache@v2
-        if: runner.environment == 'github-hosted' && !matrix.musl
+        if: runner.environment == 'github-hosted'
         with:
           # A release restores only what a release saved: an untrusted build has its own key and saves nothing.
           shared-key: ${{ inputs.trusted && 'release' || 'nightly' }}-${{ matrix.name }}
           save-if: ${{ inputs.trusted }}
       - name: ALSA and udev headers
-        if: runner.os == 'Linux' && !matrix.musl
+        if: runner.os == 'Linux'
         run: sudo apt-get update && sudo apt-get install -y --no-install-recommends libasound2-dev libudev-dev
       - name: Build the client, horizon-ctl, horizon-prepare and horizon-server
-        if: ${{ !matrix.musl }}
-        run: cargo build --release --locked ${{ matrix.target && format('--target {0}', matrix.target) || '' }} -p horizon-client -p horizon-client-lib --bin horizon-client --bin horizon-ctl -p horizon-prepare --bin horizon-prepare -p horizon-server --bin horizon-server
+        # `horizon-client/mods`: every released game runs code mods (the feature is off in dev builds).
+        run: cargo build --release --locked --features horizon-client/mods -p horizon-client --bin horizon-client --bin horizon-ctl -p horizon-prepare --bin horizon-prepare -p horizon-server --bin horizon-server
       - name: Every program the release folder takes was built
-        if: ${{ !matrix.musl }}
         run: |
           for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
-            test -f "$BIN/$binary${{ matrix.exe }}" || { echo "::error::$BIN/$binary${{ matrix.exe }} is missing"; exit 1; }
+            test -f "target/release/$binary${{ matrix.exe }}" || { echo "::error::target/release/$binary${{ matrix.exe }} is missing"; exit 1; }
           done
-      - name: Verify Windows executable architecture
-        if: runner.os == 'Windows'
-        run: |
-          python tools/check_pe_arch.py "${{ matrix.pe_arch }}" \
-            "$BIN/horizon-client${{ matrix.exe }}" "$BIN/horizon-ctl${{ matrix.exe }}" \
-            "$BIN/horizon-prepare${{ matrix.exe }}" "$BIN/horizon-server${{ matrix.exe }}"
       - name: The signing keychain, unlocked
         if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != '' && inputs.developer_id
         env:
@@ -196,16 +157,15 @@ jobs:
         run: |
           for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
             codesign --force --options runtime --timestamp --keychain "$MACOS_SIGN_KEYCHAIN" \
-              --identifier "dev.horizon.${binary#horizon-}" --sign "$MACOS_SIGN_IDENTITY" "$BIN/$binary"
-            codesign --verify --strict --verbose=2 "$BIN/$binary"
+              --identifier "dev.horizon.${binary#horizon-}" --sign "$MACOS_SIGN_IDENTITY" "target/release/$binary"
+            codesign --verify --strict --verbose=2 "target/release/$binary"
           done
       - name: Only system libraries
-        if: ${{ !matrix.musl }}
         # Windows: no non-system DLL (a "DLL not found" dialog on some players' machines). Linux: the standard
         # loader and libraries every desktop distribution has. macOS: only the system's own libraries.
         run: |
           for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do
-            file="$BIN/$binary${{ matrix.exe }}"
+            file="target/release/$binary${{ matrix.exe }}"
             if [[ "$RUNNER_OS" == macOS ]]; then
               others=$(otool -L "$file" | tail -n +2 | awk '{print $1}' | grep -v -E '^(/usr/lib/|/System/Library/)' || true)
               [[ -z "$others" ]] || { echo "::error::$binary links $others"; exit 1; }
@@ -213,20 +173,10 @@ jobs:
               ${{ runner.os == 'Windows' && 'python' || 'python3' }} tools/check_imports.py "$file"
             fi
           done
-      - name: Baseline x86-64 CPUs only
-        # No POPCNT or LZCNT at all (the script says why only those): a C library's count intrinsic killed the
-        # game before main on a Core 2 (#7264). Not the Mac builds: every Intel Mac that runs macOS 11 has both.
-        if: runner.os != 'macOS' && matrix.pe_arch != 'arm64' && !matrix.musl
-        run: |
-          set -euo pipefail
-          rustup component add llvm-tools
-          ${{ runner.os == 'Windows' && 'python' || 'python3' }} tools/check_cpu_baseline.py \
-            $(for binary in horizon-client horizon-ctl horizon-prepare horizon-server; do echo "$BIN/$binary${{ matrix.exe }}"; done)
       - name: Every program starts
-        if: ${{ !matrix.musl }}
         run: |
           set -euo pipefail
-          bin=$BIN
+          bin=target/release
           "$bin/horizon-client${{ matrix.exe }}" --help | grep -q -- '--resources'
           "$bin/horizon-ctl${{ matrix.exe }}" --help > /dev/null
           "$bin/horizon-prepare${{ matrix.exe }}" --help | grep -q -- '--minecraft-dir'
@@ -252,7 +202,7 @@ jobs:
           home="$RUNNER_TEMP/horizon-smoke"
           rm -rf "$home" && mkdir -p "$home"
           version=$(sed -n 's/.*"version": *"\([^"]*\)".*/\1/p' research-lock.json | head -1)
-          client="$PWD/$BIN/horizon-client"
+          client="$PWD/target/release/horizon-client"
           resources="$PWD/.local/horizon-client/$version"
           (cd "$home" && HORIZON_HOME="$home" HORIZON_NO_AUDIO=1 "$client" --resources "$resources" --offscreen \
             --world smoke --seed 1 --render-distance 4 --world-frames 1500 --timeout-seconds 180 \
@@ -267,30 +217,21 @@ jobs:
           EOF
           # Published with the release; the publish job checks it again before it publishes anything.
           cp "$home/smoke.json" "$RUNNER_TEMP/smoke-test.json"
-      # One smoke-test.json per build, the Apple Silicon one's; the Intel build must pass its own run too.
-      - uses: actions/upload-artifact@v7
-        if: runner.environment == 'self-hosted' && !matrix.target
+      - uses: actions/upload-artifact@v4
+        if: runner.environment == 'self-hosted'
         with:
           name: smoke-test.json
           path: ${{ runner.temp }}/smoke-test.json
           if-no-files-found: error
           retention-days: 3
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@v4
         with:
           name: original-exporters
           path: exporters
-      - name: Build, check and package for musl in Alpine
-        if: matrix.musl
-        # Run Docker on the Ubuntu host: JavaScript actions themselves require glibc.
-        run: |
-          docker run --rm -v "$PWD:/work" -w /work \
-            -e HORIZON_VERSION -e HORIZON_NIGHTLY \
-            rust:alpine3.22 sh tools/ci/build-musl.sh
       - name: Package
-        if: ${{ !matrix.musl }}
         run: |
           set -euo pipefail
-          cargo run --locked -p xtask -- package "$BIN/horizon-client${{ matrix.exe }}" "dist/${{ matrix.dir }}"
+          cargo run --locked -p xtask -- package "target/release/horizon-client${{ matrix.exe }}" "dist/${{ matrix.dir }}"
           cd dist
           rm -f "${{ matrix.asset }}"
           case "${{ matrix.asset }}" in
@@ -314,7 +255,7 @@ jobs:
             codesign --verify --strict "dist/${{ matrix.dir }}/$binary"
           done
           packaging/macos/notarize.sh "dist/${{ matrix.asset }}"
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.asset }}
           path: dist/${{ matrix.asset }}
@@ -325,8 +266,9 @@ jobs:
         run: |
           set -euo pipefail
           # After the client is packaged: target/release/horizon-client is rebuilt without the audio and
-          # controllers features, so it needs neither libasound nor libudev (minimal server images lack them).
-          cargo build --release --locked -p horizon-client --no-default-features --bin horizon-client
+          # controllers features, so it needs neither libasound nor libudev (minimal server images lack them),
+          # and with code mods like the client.
+          cargo build --release --locked -p horizon-client --no-default-features --features mods --bin horizon-client
           cargo run --locked -p xtask -- package-server target/release/horizon-client "dist/${{ matrix.server_dir }}"
           folder="dist/${{ matrix.server_dir }}"
           python3 tools/check_imports.py --server "$folder/horizon-engine" "$folder/horizon-server" "$folder/horizon-prepare"
@@ -336,7 +278,7 @@ jobs:
           rm -f "${{ matrix.server_asset }}"
           tar czf "${{ matrix.server_asset }}" "${{ matrix.server_dir }}"
           ls -l "${{ matrix.server_asset }}"
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         if: matrix.server_asset
         with:
           name: ${{ matrix.server_asset }}

.github/workflows/launcher.yml

@@ -1,5 +1,5 @@
 name: launcher
-# Builds the launcher on Linux, macOS, Windows x64 and ARM64, and releases it by itself (docs/release-flow.md): after a
+# Builds the launcher on Linux, macOS and Windows, and releases it by itself (docs/release-flow.md): after a
 # push to main that changes the launcher or a crate it builds in (the paths below),
 # every 10 minutes (a release waiting for merges to settle goes out) and by hand, tools/release_train.py decides as
 # for the game.
@@ -8,16 +8,9 @@ name: launcher
 # feature. The version and the tag are given to the build (HORIZON_LAUNCHER_VERSION, HORIZON_LAUNCHER_TAG): no bump
 # commits.
 # Never marked latest. Pushes to launcher branches only build. RELEASES_PAUSED=1 stops releases.
-# Linux ships two archives of one binary: the .tar.gz the launcher updates itself from, and an
-# AppImage (packaging/linux/appimage.sh) for players without a distribution package, which replaces
-# itself instead (launcher/src/backend.rs).
-# macOS: Apple Silicon, and Intel cross-built for x86_64-apple-darwin on the same runner, its tests and smoke test
-# under Rosetta 2 (#1161). With the repository variable MACOS_SIGN_IDENTITY set, Horizon.app and the .dmg are signed with
+# macOS: with the repository variable MACOS_SIGN_IDENTITY set, Horizon.app and the .dmg are signed with
 # Developer ID, notarized and stapled, from the runner's signing keychain (packaging/macos/README.md);
 # unset (forks), they are signed ad hoc.
-# Windows ships each architecture's launcher in its ZIP (what a launcher updates itself from) and as
-# horizon-launcher-setup.exe or horizon-launcher-setup-arm64.exe, which opens the per-user installer instead of Home
-# (launcher/src/installer.rs).
 #   gh workflow run launcher --ref <branch>                    # dry run: builds everything, publishes nothing
 #   gh workflow run launcher --ref main -f dry_run=false -f force=true
 
@@ -25,19 +18,16 @@ on:
   push:
     branches: [main, launcher, 'launcher-*']
     paths:
-      # Everything the launcher is built and packaged from, as tools/release_train.py's LAUNCHER_PATHS.
+      # Every crate the launcher builds in, as tools/release_train.py's LAUNCHER_PATHS.
       - 'launcher/**'
       - 'crates/horizon-bench/**'
       - 'crates/horizon-friends/**'
-      - 'crates/horizon-mcp/**'
       - 'crates/horizon-mods/**'
       - 'crates/horizon-port-pack/**'
       - 'crates/horizon-prepare/**'
       - 'crates/horizon-release-sign/**'
       - 'crates/horizon-telemetry/**'
       - 'crates/horizon-theme/**'
-      - 'packaging/linux/**'
-      - 'packaging/icons/**'
       - '.github/workflows/launcher.yml'
   schedule:
     - cron: '7-59/10 * * * *'
@@ -74,7 +64,7 @@ jobs:
       version: ${{ steps.decide.outputs.version }}
       dry_run: ${{ steps.mode.outputs.dry_run }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - id: mode
@@ -103,10 +93,6 @@ jobs:
     needs: decide
     if: needs.decide.outputs.release == 'true'
     name: build ${{ matrix.name }}
-    # Windows ARM64 is new: its failure never holds the other platforms' release (the signing job
-    # needs this job, and a failed entry of it would fail it). The release steps leave the missing
-    # ARM64 files out with a warning.
-    continue-on-error: ${{ matrix.name == 'windows-arm64' }}
     strategy:
       fail-fast: false
       matrix:
@@ -119,38 +105,18 @@ jobs:
             mac: true
             asset: horizon-launcher-macos-arm64.zip
             binary: horizon-launcher
-            mac_arch: arm64
-          - name: macos-x64
-            mac: true
-            target: x86_64-apple-darwin
-            asset: horizon-launcher-macos-x64.zip
-            binary: horizon-launcher
-            mac_arch: x64
           - name: windows
             os: windows-latest
             asset: horizon-launcher-windows-x64.zip
             binary: horizon-launcher.exe
-            pe_arch: x64
-            setup_asset: horizon-launcher-setup.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
-          - name: windows-arm64
-            os: windows-11-vs2026-arm
-            target: aarch64-pc-windows-msvc
-            asset: horizon-launcher-windows-arm64.zip
-            binary: horizon-launcher.exe
-            pe_arch: arm64
-            setup_asset: horizon-launcher-setup-arm64.exe
-            # The C runtime linked in, so the standalone ARM64 launcher needs no redistributable.
-            rustflags: -C target-feature=+crt-static
     runs-on: ${{ matrix.mac && (vars.MAC_RUNNER || 'ludovics-mac-mini') || matrix.os }}
     # Notarizing the app and then the .dmg can take a few minutes each.
     timeout-minutes: ${{ matrix.mac && 60 || 40 }}
     env:
       RUSTFLAGS: ${{ matrix.rustflags }}
-      # Where cargo puts the launcher: target/release, or target/<target>/release for another target.
-      BIN: ${{ matrix.target && format('target/{0}/release', matrix.target) || 'target/release' }}
       # Horizon's Azure app for Microsoft sign-in (docs/microsoft-account.md): a repository
       # variable, not a secret. Unset, the launcher says sign-in is not configured.
       HORIZON_MSA_CLIENT_ID: ${{ vars.HORIZON_MSA_CLIENT_ID }}
@@ -166,7 +132,7 @@ jobs:
         working-directory: launcher
         shell: bash
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           ref: ${{ needs.decide.outputs.head }}
           persist-credentials: false
@@ -174,8 +140,6 @@ jobs:
           # parity jobs, and nothing they leave may end up in a launcher release (target/ is rebuilt from scratch).
           clean: true
       - uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: ${{ matrix.target }}
       - uses: Swatinem/rust-cache@v2
         if: runner.environment == 'github-hosted'
         with:
@@ -185,7 +149,7 @@ jobs:
         if: runner.os == 'Linux'
         run: |
           sudo apt-get update
-          sudo apt-get install -y libxkbcommon-x11-dev libwayland-dev libx11-xcb-dev libfontconfig-dev libvulkan-dev libasound2-dev patchelf
+          sudo apt-get install -y libxkbcommon-x11-dev libwayland-dev libx11-xcb-dev libfontconfig-dev libvulkan-dev libasound2-dev
       - name: Metal shaders compiled now, or at run time without the Metal toolchain
         # GPUI compiles its Metal shaders when it builds; the Mac mini has Xcode without the Metal toolchain
         # (xcodebuild -downloadComponent MetalToolchain), so there they are compiled when the launcher starts.
@@ -193,23 +157,20 @@ jobs:
         run: |
           if ! xcrun metal --version > /dev/null 2>&1; then
             echo "::notice::No Metal toolchain on this runner: GPUI compiles its shaders at run time"
-            echo "LAUNCHER_FEATURES=gpui_platform/runtime_shaders" >> "$GITHUB_ENV"
+            echo "LAUNCHER_FEATURES=gpui/runtime_shaders" >> "$GITHUB_ENV"
           fi
       # Every test target (the library, the binary, tests/), on each system the launcher ships for.
-      - run: cargo test --release --locked ${{ matrix.target && format('--target {0}', matrix.target) || '' }} ${LAUNCHER_FEATURES:+--features "$LAUNCHER_FEATURES"}
-      - run: cargo build --release --locked ${{ matrix.target && format('--target {0}', matrix.target) || '' }} ${LAUNCHER_FEATURES:+--features "$LAUNCHER_FEATURES"}
-      - name: Verify Windows executable architecture
-        if: runner.os == 'Windows'
-        run: python ../tools/check_pe_arch.py "${{ matrix.pe_arch }}" "$BIN/${{ matrix.binary }}"
+      - run: cargo test --release --locked ${LAUNCHER_FEATURES:+--features "$LAUNCHER_FEATURES"}
+      - run: cargo build --release --locked ${LAUNCHER_FEATURES:+--features "$LAUNCHER_FEATURES"}
       - name: The version is the release's
         run: |
-          out=$("$BIN/${{ matrix.binary }}" --version)
+          out=$(target/release/${{ matrix.binary }} --version)
           echo "$out"
           expected="${HORIZON_LAUNCHER_VERSION:-$(sed -n 's/^version = "\(.*\)"/\1/p' Cargo.toml | head -1)}"
           [[ "$out" == "horizon-launcher $expected" ]] || { echo "::error::expected horizon-launcher $expected"; exit 1; }
       - name: Only system libraries
         run: |
-          file="$BIN/${{ matrix.binary }}"
+          file=target/release/${{ matrix.binary }}
           case "$RUNNER_OS" in
             Windows) python ../tools/check_imports.py "$file" ;;
             macOS) others=$(otool -L "$file" | tail -n +2 | awk '{print $1}' | grep -v -E '^(/usr/lib/|/System/Library/)' || true)
@@ -224,29 +185,13 @@ jobs:
           export HORIZON_LAUNCHER_HOME="${RUNNER_TEMP//\\//}/horizon-launcher-smoke"
           export HORIZON_HOME="$HORIZON_LAUNCHER_HOME/game"
           rm -rf "$HORIZON_LAUNCHER_HOME"
-          launcher="$PWD/$BIN/${{ matrix.binary }}"
+          launcher="$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 $((i * 15)); done; return 1; }
           retry "$launcher" versions
-          "$launcher" links --json
-          # The Intel Mac launcher can come out before any game build has its asset (#1161): then there is nothing
-          # to install yet. Only that entry skips, and only on a version list that parsed and had no build here
-          # (exit 3); a launcher or a script that fails still fails the step. The Windows ARM64 launcher always has
-          # one: it installs the x64 build where a release has no ARM64 one (backend.rs, GAME_FALLBACK).
-          if [[ "${{ matrix.name }}" == macos-x64 ]]; then
-            versions=$(retry "$launcher" --json versions)
-            no_build='import json, sys; sys.exit(3 if not any(r["available_here"] for r in json.load(sys.stdin)) else 0)'
-            status=0
-            python3 -c "$no_build" <<<"$versions" || status=$?
-            if [[ $status == 3 ]]; then
-              echo "::warning::No game build has an asset for ${{ matrix.name }} yet: install not tested"
-              rm -rf "$HORIZON_LAUNCHER_HOME"
-              exit 0
-            fi
-            [[ $status == 0 ]] || exit $status
-          fi
           retry "$launcher" install latest
           "$launcher" versions --installed
+          "$launcher" links --json
           # `install latest` is the Nightly since #3342 (versions/nightly-<date>-<commit>), a vX.Y.Z before.
           clients=("$HORIZON_LAUNCHER_HOME"/versions/*/horizon-client*)
           client="${clients[0]}"
@@ -256,11 +201,6 @@ jobs:
           # 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 [[ "$RUNNER_OS" == "Windows" ]]; then
-            if ! python ../tools/check_pe_arch.py "${{ matrix.pe_arch }}" "$client"; then
-              # A Nightly without an ARM64 build: the ARM64 launcher installs the x64 one (backend.rs, GAME_FALLBACK).
-              [[ "${{ matrix.pe_arch }}" == arm64 ]] && python ../tools/check_pe_arch.py x64 "$client" || exit 1
-              echo "::warning::the latest game has no ARM64 build: the launcher installed the x64 one"
-            fi
             python ../tools/check_imports.py "$client"
           elif [[ "$RUNNER_OS" == "Linux" ]]; then
             soft python3 ../tools/check_imports.py "$client"
@@ -268,18 +208,6 @@ jobs:
           # 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
-          # The per-user Windows setup: the same binary under the setup's name installs into a scratch
-          # folder, and the copy it installs uninstalls itself. HKCU of the runner only.
-          if [[ "$RUNNER_OS" == "Windows" ]]; then
-            setup="$RUNNER_TEMP/setup-smoke"
-            cp "$launcher" "$RUNNER_TEMP/horizon-launcher-setup.exe"
-            "$RUNNER_TEMP/horizon-launcher-setup.exe" setup --quiet --dir "$setup"
-            installed="$setup/Horizon Launcher/horizon-launcher.exe"
-            [[ -f "$installed" ]] || { echo "::error::the setup copied no launcher"; exit 1; }
-            "$installed" uninstall --quiet
-            [[ ! -f "$installed" ]] || { echo "::error::uninstall left the launcher"; exit 1; }
-            rm -rf "$setup"
-          fi
           rm -rf "$HORIZON_LAUNCHER_HOME"
       - name: The signing keychain, unlocked
         if: runner.os == 'macOS' && vars.MACOS_SIGN_IDENTITY != ''
@@ -296,18 +224,11 @@ jobs:
             # Developer ID): packaging/macos.
             python3 -m venv "$RUNNER_TEMP/dmg" && "$RUNNER_TEMP/dmg/bin/pip" install --quiet dmgbuild==1.6.5
             version=${HORIZON_LAUNCHER_VERSION:-$(sed -n 's/^version = "\(.*\)"/\1/p' Cargo.toml | head -1)}
-            DMGBUILD="$RUNNER_TEMP/dmg/bin/dmgbuild" ../packaging/macos/package.sh "$BIN/${{ matrix.binary }}" "$version" out ${{ matrix.mac_arch }}
+            DMGBUILD="$RUNNER_TEMP/dmg/bin/dmgbuild" ../packaging/macos/package.sh target/release/${{ matrix.binary }} "$version" out
             rm -rf out/Horizon.app
           else
-            version=${HORIZON_LAUNCHER_VERSION:-$(sed -n 's/^version = "\(.*\)"/\1/p' Cargo.toml | head -1)}
-            if [[ "$RUNNER_OS" == "Linux" ]]; then
-              # The .tar.gz below is what the launcher updates itself from; the AppImage is what a
-              # player downloads and double-clicks, and it replaces itself instead
-              # (packaging/linux/appimage.sh, launcher/src/backend.rs).
-              ../packaging/linux/appimage.sh "$BIN/${{ matrix.binary }}" "$version" out
-            fi
             mkdir -p dist
-            cp "$BIN/${{ matrix.binary }}" dist/
+            cp target/release/${{ matrix.binary }} dist/
             if [[ "${{ matrix.asset }}" == *.tar.gz ]]; then
               (cd dist && tar czf ../out/${{ matrix.asset }} ${{ matrix.binary }})
             else
@@ -315,13 +236,7 @@ jobs:
             fi
           fi
           ls -l out
-      - name: Setup exe (Windows)
-        # The launcher's binary under another name: started with no arguments it shows the per-user
-        # installer instead of Home (launcher/src/installer.rs). Its name is what makes it the setup,
-        # so the ZIP's copy stays the launcher. Both go into the release's signed SHA256SUMS.
-        if: runner.os == 'Windows'
-        run: cp "$BIN/${{ matrix.binary }}" "out/${{ matrix.setup_asset }}"
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         with:
           name: ${{ matrix.asset }}
           path: launcher/out/*
@@ -339,12 +254,12 @@ jobs:
     # tools/ci/sign_release.sh, which calls only the runner's sha256sum and OpenSSL (docs/release-flow.md).
     environment: ${{ needs.decide.outputs.dry_run != 'true' && 'release' || '' }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           sparse-checkout: tools/ci/sign_release.sh
           sparse-checkout-cone-mode: false
           persist-credentials: false
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@v4
         with:
           path: dist
           pattern: horizon-launcher-*
@@ -356,13 +271,13 @@ jobs:
           EPHEMERAL: ${{ needs.decide.outputs.dry_run == 'true' && 'yes' || '' }}
           TAG: ${{ needs.decide.outputs.tag }}
         run: bash tools/ci/sign_release.sh "$TAG" dist/horizon-launcher-*
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         with:
           name: signature
           path: dist/SHA256SUMS*
           if-no-files-found: error
           retention-days: 3
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         if: needs.decide.outputs.dry_run == 'true'
         with:
           name: ephemeral.pub
@@ -376,7 +291,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: Notes
@@ -386,7 +301,7 @@ jobs:
           python3 tools/release_train.py notes --kind launcher --tag "${{ needs.decide.outputs.tag }}" \
             --head "${{ needs.decide.outputs.head }}" --out notes > /dev/null
           { echo "## $(cat notes/title.txt)"; echo; cat notes/body.md; } >> "$GITHUB_STEP_SUMMARY"
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@v4
         with:
           path: dist
           merge-multiple: true
@@ -398,13 +313,6 @@ jobs:
           key=(); [[ -n "$EPHEMERAL" ]] && key=(--key "$(cat dist/ephemeral.pub)")
           cargo run --locked --quiet -p horizon-release-sign -- verify --tag "$TAG" --publishing "${key[@]}" dist
       # Never marked latest: Horizon's own releases stay the repository's latest.
-      - name: The Windows ARM64 launcher, if it built
-        # Its build may fail without holding the release (continue-on-error): the release then has no ARM64
-        # files, and ARM64 launchers stay on their version until one has (backend::launcher_update_from).
-        run: |
-          for file in horizon-launcher-windows-arm64.zip horizon-launcher-setup-arm64.exe; do
-            [[ -f "dist/$file" ]] || echo "::warning::$file is missing: this release goes out without it"
-          done
       - name: Publish ${{ needs.decide.outputs.tag }}
         if: needs.decide.outputs.dry_run != 'true'
         env:
@@ -419,7 +327,7 @@ jobs:
         run: |
           echo "Would publish ${{ needs.decide.outputs.tag }} at ${{ needs.decide.outputs.head }}: $(cat notes/title.txt)"
           ls -l dist
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         with:
           name: launcher-release-notes
           path: notes/

.github/workflows/mod-registry.yml

@@ -15,23 +15,17 @@ on:
       - '.github/workflows/mod-registry.yml'
 permissions:
   contents: read
-concurrency:
-  group: mod-registry-${{ github.event.pull_request.number || github.sha }}
-  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 jobs:
   check:
-    # Our checks runners (label horizon-checks, docs/ci-runners.md); SELF_HOSTED_CI=light or off: GitHub's.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && vars.SELF_HOSTED_CI != 'light' && fromJSON('["self-hosted", "linux", "horizon-checks"]') || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     timeout-minutes: 20
     defaults:
       run:
         working-directory: crates/horizon-mod-registry
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
       - run: rustup toolchain install stable --profile minimal --component rustfmt --component clippy
-      # Ours keep their build folder between jobs.
       - uses: Swatinem/rust-cache@v2
-        if: runner.environment == 'github-hosted'
         with:
           workspaces: crates/horizon-mod-registry
           save-if: ${{ github.ref == 'refs/heads/main' }}

.github/workflows/mojang-republish.yml

@@ -1,32 +0,0 @@
-name: mojang republish
-# Hourly: does Mojang's version manifest list a pinned-version JSON that research-lock.json does not know?
-# If so, one issue "Mojang republished <version>: <sha8>" with the hashes and a lock snippet
-# (tools/ci/mojang_republish.py). Reads only Mojang's public manifest.
-#   gh workflow run "mojang republish" -f dry_run=true
-on:
-  schedule:
-    - cron: '23 * * * *'  # hourly: a republished JSON breaks horizon-prepare for every new player until accepted
-  workflow_dispatch:
-    inputs:
-      dry_run:
-        description: Only print what it would do with issues
-        type: boolean
-        default: false
-permissions:
-  contents: read
-  issues: write
-concurrency:
-  group: mojang-republish
-  cancel-in-progress: false
-
-jobs:
-  check:
-    # One of our small runners (label horizon-light, docs/ci-runners.md): main's script, Mojang's public manifest.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
-    timeout-minutes: 10
-    steps:
-      - uses: actions/checkout@v7
-      - name: Check the manifest
-        env:
-          GH_TOKEN: ${{ github.token }}
-        run: python3 tools/ci/mojang_republish.py ${{ inputs.dry_run && '--dry-run' || '' }}

.github/workflows/native-hook-stamp.yml

@@ -1,59 +0,0 @@
-name: native hook stamp
-# Opens a PR that numbers pending fragments after they merge. Only pushes to
-# main run main's own tool; fragments are read as data, not PR code.
-
-on:
-  push:
-    branches: [main]
-    paths:
-      - 'tools/native-hook-fragments/*.json'
-
-permissions:
-  contents: read
-
-concurrency:
-  group: native-hook-stamp
-  cancel-in-progress: false
-
-jobs:
-  stamp:
-    if: github.repository == 'horizon-rust/horizon'
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-      pull-requests: write
-    timeout-minutes: 10
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          ref: main
-          fetch-depth: 0
-      - name: Open a stamp pull request
-        env:
-          GH_TOKEN: ${{ github.token }}
-        run: |
-          set -eu
-          branch=automation/native-hook-stamp
-          if [ -n "$(gh pr list --state open --head "$branch" --json number --jq '.[0].number // empty')" ]; then
-            echo "A stamp pull request is already open."
-            exit 0
-          fi
-          python3 tools/stamp_native_hooks.py
-          if git diff --quiet; then
-            echo "No fragments to stamp."
-            exit 0
-          fi
-          git config user.name 'github-actions[bot]'
-          git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
-          git checkout -b "$branch"
-          git add -u
-          git commit -m 'Stamp native hook API fragments'
-          if git ls-remote --exit-code --heads origin "$branch" >/dev/null; then
-            git fetch origin "+refs/heads/$branch:refs/remotes/origin/$branch"
-          fi
-          git push --force-with-lease origin "$branch"
-          # The repo doesn't let GitHub Actions open pull requests (that setting would also let it approve them):
-          # the branch is pushed, and a maintainer opens the PR from it.
-          if ! gh pr create --base main --head "$branch" --title 'Stamp native hook API fragments' --body 'Assign API numbers to the pending native hook fragments. Close and reopen this PR to run CI.'; then
-            echo "::warning::Stamped fragments are on $branch; open a pull request from it (GitHub Actions may not open one here)."
-          fi

.github/workflows/nightly-build.yml

@@ -92,7 +92,7 @@ jobs:
       source_tag: ${{ steps.pick.outputs.source_tag }}
       dry_run: ${{ steps.mode.outputs.dry_run }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -124,14 +124,14 @@ jobs:
         env:
           SHA: ${{ steps.pick.outputs.sha }}
         run: git archive --format=tar.gz --prefix="horizon-${SHA:0:7}/" -o horizon-source.tar.gz "$SHA"
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         if: steps.pick.outputs.build == 'true'
         with:
           name: horizon-source
           path: horizon-source.tar.gz
           if-no-files-found: error
           retention-days: 3
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         with:
           name: nightly-notes
           path: nightly-notes.md
@@ -155,12 +155,12 @@ jobs:
     # The key's only job: main's sign_release.sh hashes the archives and signs with the runner's OpenSSL.
     environment: ${{ needs.pick.outputs.dry_run != 'true' && 'release' || '' }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           sparse-checkout: tools/ci/sign_release.sh
           sparse-checkout-cone-mode: false
           persist-credentials: false
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@v4
         with:
           path: dist
           pattern: horizon-*
@@ -171,22 +171,15 @@ jobs:
           RELEASE_SIGNING_KEY_NEXT: ${{ secrets.RELEASE_SIGNING_KEY_NEXT }}
           EPHEMERAL: ${{ needs.pick.outputs.dry_run == 'true' && 'yes' || '' }}
         run: |
-          # Windows ARM64's build may fail without holding the Nightly (game-build.yml): then it is left out.
-          arm64=(); if [[ -f dist/horizon-windows-arm64.zip ]]; then arm64=(dist/horizon-windows-arm64.zip)
-          else echo "::warning::horizon-windows-arm64.zip is missing: SHA256SUMS goes out without it"; fi
-          musl=(); if [[ -f dist/horizon-linux-musl-x86_64.tar.gz ]]; then musl=(dist/horizon-linux-musl-x86_64.tar.gz)
-          else echo "::warning::horizon-linux-musl-x86_64.tar.gz is missing: SHA256SUMS goes out without it"; fi
           bash tools/ci/sign_release.sh nightly dist/horizon-linux-x86_64.tar.gz dist/horizon-windows-x64.zip \
-            "${arm64[@]}" "${musl[@]}" \
-            dist/horizon-macos-arm64.zip dist/horizon-macos-x64.zip dist/horizon-server-linux-x86_64.tar.gz \
-            dist/horizon-source.tar.gz
-      - uses: actions/upload-artifact@v7
+            dist/horizon-macos-arm64.zip dist/horizon-server-linux-x86_64.tar.gz dist/horizon-source.tar.gz
+      - uses: actions/upload-artifact@v4
         with:
           name: signature
           path: dist/SHA256SUMS*
           if-no-files-found: error
           retention-days: 3
-      - uses: actions/upload-artifact@v7
+      - uses: actions/upload-artifact@v4
         if: needs.pick.outputs.dry_run == 'true'
         with:
           name: ephemeral.pub
@@ -201,10 +194,10 @@ jobs:
       contents: write
       issues: read          # the open release-blocker issues (gate)
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           persist-credentials: false
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@v4
         with:
           path: dist
           merge-multiple: true
@@ -236,29 +229,13 @@ jobs:
           set -euo pipefail
           python3 tools/ci/nightly.py rotate
           signature=(); [[ -f dist/SHA256SUMS.sig ]] && signature=(dist/SHA256SUMS.sig)
-          # The ARM64 archive only when its build succeeded (the sign job left it out of SHA256SUMS otherwise).
-          arm64=()
-          if [[ -f dist/horizon-windows-arm64.zip ]]; then
-            arm64=("dist/horizon-windows-arm64.zip#Game files the launcher installs (Nightly): Windows ARM64 (horizon-windows-arm64.zip)")
-          else
-            echo "::warning::horizon-windows-arm64.zip is missing: the Nightly goes out without it (ARM64 launchers install the x64 build)"
-          fi
-          musl=()
-          if [[ -f dist/horizon-linux-musl-x86_64.tar.gz ]]; then
-            musl=("dist/horizon-linux-musl-x86_64.tar.gz#Game files for musl Linux (horizon-linux-musl-x86_64.tar.gz)")
-          else
-            echo "::warning::horizon-linux-musl-x86_64.tar.gz is missing: the Nightly goes out without it"
-          fi
           # A pre-release, never GitHub's latest: the latest stays the last vX.Y.Z, which launchers and servers from
           # before the Nightly-only switch keep (they don't read Nightlies).
           gh release create nightly --prerelease --latest=false --target "$SHA" \
             --title "Nightly $DATE · ${SHA:0:7}" --notes-file dist/nightly-notes.md \
-            "dist/horizon-linux-x86_64.tar.gz#Game files the launcher installs (Nightly): Linux (horizon-linux-x86_64.tar.gz)" \
-            "${musl[@]}" \
-            "dist/horizon-windows-x64.zip#Game files the launcher installs (Nightly): Windows (horizon-windows-x64.zip)" \
-            "${arm64[@]}" \
-            "dist/horizon-macos-arm64.zip#Game files the launcher installs (Nightly): macOS on Apple Silicon (horizon-macos-arm64.zip)" \
-            "dist/horizon-macos-x64.zip#Game files the launcher installs (Nightly): macOS on Intel (horizon-macos-x64.zip)" \
+            "dist/horizon-linux-x86_64.tar.gz#Nightly game files: Linux (horizon-linux-x86_64.tar.gz)" \
+            "dist/horizon-windows-x64.zip#Nightly game files: Windows (horizon-windows-x64.zip)" \
+            "dist/horizon-macos-arm64.zip#Nightly game files: macOS (horizon-macos-arm64.zip)" \
             "dist/horizon-server-linux-x86_64.tar.gz#Nightly dedicated server for Linux (horizon-server-linux-x86_64.tar.gz)" \
             "dist/horizon-source.tar.gz#Source of this Nightly, commit ${SHA:0:7} (horizon-source.tar.gz; kept for good as the tag $SOURCE_TAG)" \
             dist/SHA256SUMS "${signature[@]}" dist/smoke-test.json
@@ -274,8 +251,7 @@ jobs:
     # Tells the thread that asked for this build how it ended. A conflict `pick` already explained there.
     needs: [pick, build, sign, publish]
     if: always() && inputs.issue != '' && needs.pick.result == 'success'
-    # One comment, no checkout and no secret: one of our small runners (label horizon-light, docs/ci-runners.md).
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     timeout-minutes: 5
     permissions:
       issues: write

.github/workflows/nightly-command.yml

@@ -27,7 +27,7 @@ jobs:
       issues: write         # answers in the thread
       pull-requests: write
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           ref: main
           persist-credentials: false

.github/workflows/nightly.yml

@@ -48,7 +48,7 @@ jobs:
           else
             echo "run=true" >> "$GITHUB_OUTPUT"
           fi
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         if: steps.when.outputs.run == 'true'
         with:
           fetch-depth: 0
@@ -82,7 +82,7 @@ jobs:
         run: python3 tools/ci/parity_issues.py --since "${{ steps.audit.outputs.since }}" ${{ inputs.dry_run && '--dry-run' || '' }} | tee -a "$GITHUB_STEP_SUMMARY"
       - name: Logs of the failed harnesses
         if: steps.when.outputs.run == 'true' && steps.audit.outputs.exit != '0'
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@v4
         with:
           name: nightly-parity-logs
           path: .local/parity-runner/logs/

.github/workflows/overlap-note.yml

@@ -1,43 +0,0 @@
-name: overlap note
-# One comment on a pull request naming the other open pull requests that close the same issue or change the same
-# functions, edited on every push (tools/ci/overlap_note.py, issue #3859).
-#
-# Why no pull request's code runs here, though `pull_request_target` gives a token that can write:
-# - `pull_request_target` runs this file and the script from main, never the pull request's copy.
-# - The checkout is main's (`ref: main`), blobless, with the script alone on disk. The pull requests' heads are fetched
-#   as git objects and only diffed, never checked out; git runs with hooks, fsmonitor, external diff and textconv off.
-# - The rest comes from the API. The token writes the comment only.
-on:
-  pull_request_target:
-    types: [opened, reopened, synchronize, ready_for_review]
-permissions:
-  contents: read
-jobs:
-  note:
-    if: github.event.pull_request.base.ref == 'main'
-    # A newer push replaces the note being computed.
-    concurrency:
-      group: overlap-note-${{ github.event.pull_request.number }}
-      cancel-in-progress: true
-    # One of our small runners (horizon-light), out of GitHub's pool: it runs main's script only (above), so a fork's
-    # pull request runs none of its code there (docs/ci-runners.md). SELF_HOSTED_CI=off: GitHub's runners.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
-    timeout-minutes: 10
-    permissions:
-      contents: read
-      pull-requests: write
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          ref: main
-          fetch-depth: 0
-          filter: blob:none
-          persist-credentials: false
-          sparse-checkout: |
-            tools/ci/overlap_note.py
-          sparse-checkout-cone-mode: false
-      - name: Note
-        env:
-          GH_TOKEN: ${{ github.token }}
-          REPO: ${{ github.repository }}
-        run: python3 tools/ci/overlap_note.py event

.github/workflows/pack-bench.yml

@@ -1,72 +0,0 @@
-name: pack load bench
-# How long resource packs take to load: crates/horizon-client-render/examples/pack_load_bench.rs on generated packs
-# (no game files), on the branch and then on `base` with the branch's copy of the bench, on the same runner, so a pull
-# request can show its numbers next to main's. Started by hand, or by a push to a `pack-bench/*` branch (a fork can't
-# start a workflow its main lacks), against horizon-rust/horizon's main.
-on:
-  push:
-    branches: ['pack-bench/**']
-  workflow_dispatch:
-    inputs:
-      base:
-        description: Ref to compare against
-        default: main
-      scale:
-        description: How many times the default pack sizes
-        default: '1'
-permissions:
-  contents: read
-env:
-  HORIZON_TELEMETRY_URL: "off"
-  CARGO_TERM_COLOR: never
-
-jobs:
-  bench:
-    # Our checks runners (label horizon-checks, docs/ci-runners.md): the branch and the base on the same machine, as
-    # the comparison needs. SELF_HOSTED_CI=light or off: GitHub's.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && vars.SELF_HOSTED_CI != 'light' && fromJSON('["self-hosted", "linux", "horizon-checks"]') || 'ubuntu-latest' }}
-    timeout-minutes: 90
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          fetch-depth: 0
-      - name: Install Rust and the ALSA and udev headers
-        env:
-          HOSTED: ${{ runner.environment == 'github-hosted' }}
-        run: |
-          if [ "$HOSTED" = true ]; then
-            sudo apt-get update && sudo apt-get install -y --no-install-recommends libasound2-dev libudev-dev
-          fi
-          rustup toolchain install stable --profile minimal
-      - uses: Swatinem/rust-cache@v2
-        if: runner.environment == 'github-hosted'
-        with:
-          shared-key: pack-bench
-      - name: Bench the branch
-        env:
-          SCALE: ${{ inputs.scale || '1' }}
-        run: |
-          cargo run --profile fast -p horizon-client-render --example pack_load_bench -- --scale "$SCALE" > head.md
-      - name: Bench the base, with the branch's bench
-        env:
-          BASE: ${{ inputs.base || 'main' }}
-          SCALE: ${{ inputs.scale || '1' }}
-        run: |
-          git fetch https://github.com/horizon-rust/horizon.git "$BASE"
-          # Our runners keep the folder beside the checkout between jobs.
-          git worktree remove --force ../base 2> /dev/null || rm -rf ../base
-          git worktree prune
-          git worktree add ../base FETCH_HEAD
-          cp crates/horizon-client-render/examples/pack_load_bench.rs ../base/crates/horizon-client-render/examples/
-          # A bench row that times a function the base lacks keeps it from building there: then
-          # the branch's own rows compare the two ways.
-          target=${CARGO_TARGET_DIR:-$GITHUB_WORKSPACE/target}
-          (cd ../base && CARGO_TARGET_DIR="$target" cargo run --profile fast -p horizon-client-render \
-            --example pack_load_bench -- --scale "$SCALE") > base.md \
-            || echo "The bench does not build on the base." > base.md
-      - name: Summary
-        run: |
-          {
-            echo "### Branch ($(git rev-parse --short HEAD))"; cat head.md
-            echo; echo "### Base (${{ inputs.base || 'main' }})"; cat base.md
-          } | tee -a "$GITHUB_STEP_SUMMARY"

.github/workflows/parity-main.yml

@@ -30,7 +30,7 @@ jobs:
     runs-on: [self-hosted, macOS, horizon-parity-main]
     timeout-minutes: 240  # a core-crate batch reruns ~300 harnesses (~60-90 min), a bisect a few rounds of the failures
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.sha }}
           fetch-depth: 0
@@ -69,7 +69,7 @@ jobs:
           python3 tools/parity_main.py bisect "$BASE_SHA" --comment
       - name: Logs of the failed harnesses
         if: steps.harnesses.outcome == 'failure'
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@v4
         with:
           name: parity-main-logs
           path: .local/parity-main-logs/

.github/workflows/parity.yml

@@ -33,7 +33,7 @@ jobs:
     # harnesses at a time) up to a few hours, and any pull request's job may land there.
     timeout-minutes: ${{ inputs.full && 360 || 180 }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           # The commit the event names: a fork's later pushes need another run-parity label. The next step merges
           # main into it.
@@ -89,7 +89,7 @@ jobs:
         run: python3 tools/parity.py --changed "$BASE_SHA" --timeout 2400  # world_spawn takes ~1480 s on a busy runner
       - name: Logs of the failed harnesses
         if: failure()
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@v4
         with:
           name: parity-logs
           path: .local/parity-runner/logs/

.github/workflows/pr-labels.yml

@@ -1,38 +0,0 @@
-name: pr labels
-# A pull request's kind label (the box ticked in the template) and area labels (the paths it changes):
-# tools/ci/pr_labels.py, CONTRIBUTING.md "Pull requests".
-#
-# Why no pull request's code runs here, though `pull_request_target` gives a token that can write to fork PRs:
-# - `pull_request_target` runs this file and the script from main, never the pull request's copy.
-# - It checks out main's script only (`ref: main`), never the pull request's head or merge commit.
-# - The script reads the event file (the description is data in JSON, never in a shell line) and the API's list of
-#   changed file names; it runs, builds and imports nothing of theirs. The token writes labels only.
-on:
-  pull_request_target:
-    types: [opened, reopened, synchronize, edited, ready_for_review]
-permissions:
-  contents: read
-jobs:
-  label:
-    # Title-only edits change nothing: skip them before a runner starts.
-    if: github.event.action != 'edited' || github.event.changes.body != null
-    # One of our small runners (horizon-light), out of GitHub's pool: it runs main's script only (above), so a fork's
-    # pull request runs none of its code there (docs/ci-runners.md). SELF_HOSTED_CI=off: GitHub's runners.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
-    timeout-minutes: 5
-    permissions:
-      contents: read
-      pull-requests: write
-    steps:
-      - uses: actions/checkout@v7
-        with:
-          ref: main
-          persist-credentials: false
-          sparse-checkout: |
-            tools/ci/pr_labels.py
-          sparse-checkout-cone-mode: false
-      - name: Label
-        env:
-          GH_TOKEN: ${{ github.token }}
-          REPO: ${{ github.repository }}
-        run: python3 tools/ci/pr_labels.py event

.github/workflows/release.yml

@@ -53,7 +53,7 @@ jobs:
       urgent: ${{ steps.decide.outputs.urgent }}
       dry_run: ${{ steps.mode.outputs.dry_run }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - id: mode

.github/workflows/run-parity.yml

@@ -5,15 +5,11 @@ name: run-parity
 # skipped `verify`, and GitHub counts a skipped required check as passed.
 on:
   pull_request:
-    # A push starts a run only to cancel the old head's (see concurrency): the job runs on the label alone.
-    types: [labeled, synchronize]
+    types: [labeled]
 permissions:
   contents: read
 concurrency:
-  # The run-parity label and pushes share one group per pull request, so the newest run cancels the one before: a
-  # pushed pull request's run tested a head the merge would no longer land. Any other label gets a group of its own:
-  # in the shared one, adding needs-proof cancelled the parity run queued seconds before (run 40766180150).
-  group: run-parity-${{ github.event.pull_request.number }}${{ github.event.action == 'labeled' && github.event.label.name != 'run-parity' && format('-{0}', github.run_id) || '' }}
+  group: run-parity-${{ github.event.pull_request.number }}
   cancel-in-progress: true
 env:
   # Test runs never reach the telemetry server: no live-count ping, no uploads (docs/telemetry.md).

.github/workflows/telemetry-server.yml

@@ -15,23 +15,17 @@ on:
       - '.github/workflows/telemetry-server.yml'
 permissions:
   contents: read
-concurrency:
-  group: telemetry-server-${{ github.event.pull_request.number || github.sha }}
-  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
 jobs:
   check:
-    # Our checks runners (label horizon-checks, docs/ci-runners.md); SELF_HOSTED_CI=light or off: GitHub's.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && vars.SELF_HOSTED_CI != 'light' && fromJSON('["self-hosted", "linux", "horizon-checks"]') || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     timeout-minutes: 20
     defaults:
       run:
         working-directory: crates/horizon-telemetry-server
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
       - run: rustup toolchain install stable --profile minimal --component rustfmt --component clippy
-      # Ours keep their build folder between jobs.
       - uses: Swatinem/rust-cache@v2
-        if: runner.environment == 'github-hosted'
         with:
           workspaces: crates/horizon-telemetry-server
           save-if: ${{ github.ref == 'refs/heads/main' }}

.github/workflows/triage-command.yml

@@ -21,15 +21,14 @@ jobs:
       startsWith(github.event.comment.body, '/reopen') ||
       startsWith(github.event.comment.body, '/label') ||
       startsWith(github.event.comment.body, '/unlabel'))
-    # One of our small runners (label horizon-light, docs/ci-runners.md): main's script only, as above.
-    runs-on: ${{ vars.SELF_HOSTED_CI != 'off' && fromJSON('["self-hosted", "linux", "horizon-light"]') || 'ubuntu-latest' }}
+    runs-on: ubuntu-latest
     timeout-minutes: 5
     permissions:
       contents: read
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@v4
         with:
           ref: main
           persist-credentials: false

.gitignore

@@ -21,7 +21,6 @@
 .DS_Store
 # What the client writes to its working directory when run from the repo root.
 /options.txt
-/debug-profile.json
 /horizon.txt
 /horizon-graphics.txt
 /horizon-controller.txt

AGENTS.md

@@ -13,15 +13,13 @@ Feature → files → harness for the most-changed areas: [docs/architecture.md]
   `XDG_CONFIG_HOME`, plus `HORIZON_LAUNCHER_NO_SELF_UPDATE=1` and `HORIZON_NO_AUDIO=1`, and, for the
   launcher, `HORIZON_LAUNCHER_TRASH`, `HORIZON_LAUNCHER_CLIPBOARD` and `HORIZON_LAUNCHER_DESKTOP` pointing into the scratch home. Never write to
   `~/.local/share/{applications,horizon,horizon-launcher}` or `~/.local/bin`.
-- **Mark what an agent posts.** A PR body starts with a line naming the person whose agent opened it and
-  the tool: `> 🤖 Opened by <login>'s AI agent (<tool, model>), not by <login> personally.`, where `<login>`
-  is the GitHub account the PR is opened from (`gh api user --jq .login`). Issues say "Filed by", reviews
-  "Review by". Every comment starts with `🤖 Agent:`. Write only as the person you work for: the lines on
-  this page that name Ludovic are for his own agents (account `ludovic111`), never for anyone else's.
+- **Mark what an agent posts.** A PR body starts with a line naming whose agent opened it and with what.
+  Ludovic's agents write `> 🤖 Opened by Ludovic's AI agent (Claude), not by Ludovic himself.`, and a
+  contributor's agent names its own person and tool (issues: "Filed by", reviews: "Review by"). Every
+  comment starts with `🤖 Agent:`. Never write as Ludovic or as anyone else.
 - **Attribution.** Commits end with a `Co-Authored-By:` line for the agent that wrote them, and PR bodies
-  with that agent's own "Generated with" line. Example, Ludovic's agents (Claude Code on `ludovic111`):
-  first line `> 🤖 Opened by Ludovic's AI agent (Claude), not by Ludovic himself.`, commits
-  `Co-Authored-By: Claude <model> <[email protected]>`, last line
+  with that agent's own "Generated with" line. Ludovic's agents use
+  `Co-Authored-By: Claude <model> <[email protected]>` and
   `🤖 Generated with [Claude Code](https://claude.com/claude-code)`.
 - Everything players run is Rust. Python/Java only for dev tools and harness drivers in `tools/`.
 - Horizon-only features follow [docs/design-system.md](docs/design-system.md) and are off by default where
@@ -30,9 +28,6 @@ Feature → files → harness for the most-changed areas: [docs/architecture.md]
   change), none for a fix. Agents never add `release-now`: the maintainer decides it. Merges ship in batches of 5, or after
   6 hours ([docs/release-flow.md](docs/release-flow.md)).
 - Contributors first: `gh pr list --state open --search <area>` before you start; never duplicate theirs.
-- **No hardcoded user-facing strings.** Keep UI translation-ready from the start. In the launcher (`launcher/`), wrap visible text with `tr("...")` or `trf("... {arg} ...", &[("arg", &val)])` from `crate::i18n` instead of raw string literals or `format!`. In the game, use translation keys (`Text::tr`, `lang::get`), never hardcoded English strings.
-- **Claim before you start**: comment `/claim` on the issue (no issue yet: open one, then claim it). An assigned
-  issue is taken: pick another. `/unclaim` when you stop; a claim with no open PR linking it is released after 5 days.
 
 ## Crates
 
@@ -40,13 +35,11 @@ Game workspace (root `Cargo.toml`); `launcher/` and `crates/horizon-telemetry-se
 
 | Crate | Owns |
 |---|---|
-| `horizon-client` | Gameplay library (`src/lib.rs`: `game.rs` + `game/`, `entry.rs`) and thin executable (`src/main.rs`). Also the dedicated server (`--dedicated`). Re-exports `horizon-client-lib` for existing mod paths. |
-| `horizon-client-lib` | Reusable client systems, `horizon-ctl`, probes and their tests. Its manifest points to the existing sources under `crates/horizon-client/`; the library root is `src/client_lib.rs`. It never depends on gameplay. |
+| `horizon-client` | The game: a lib (`src/lib.rs`, ~170 flat modules) and the bin (`src/main.rs` → `game.rs` + `game/`), plus `horizon-ctl` (`src/bin/horizon-ctl/`). Also the dedicated server (`--dedicated`) |
 | `horizon-items` | Blocks and items below gameplay: `blocks.rs` (block facts), `items.rs`, `item_data.rs` (components), `enchant.rs`, `cooldowns.rs`, `bundle.rs`, `item_nbt.rs`. Re-exported as `horizon_client::items`... |
 | `horizon-command` | Command parsing (Brigadier): the vanilla tree, argument types, selectors, suggestions, the tree's network form. Re-exported as `horizon_client::command` |
 | `horizon-client-core` | The client lib's bottom layer: `text.rs`, `lang.rs`, `snbt.rs`, `nbt_path.rs`, `component.rs`, `scoreboard.rs`, `bossbar.rs`, `gamerules.rs`, `block_entity_nbt.rs`, registry/particle/sound tables. Re-exported under the old paths (`horizon_client::text`...) |
 | `horizon-client-input` | Key bindings and key names, toggle keys, mouse options, controller settings and glyphs, the clipboard, window options (`keybinds.rs`, `gamepad.rs`, `mouse.rs`, `window.rs`...). Re-exported under the old paths |
-| `horizon-client-render` | The client's world data, rendering and screens (chunks, meshing, light, streaming, `gfx`, HUD, menus, settings): ~80 modules that horizon-client re-exports under the same paths. Nothing in it reaches gameplay |
 | `horizon-world` | Vanilla world data with no gameplay loop: NBT, regions, chunks, `datafix/`, `worldgen/`, `level/` (server-side block behaviour, ticks, redstone), entity physics, items, effects, food, damage |
 | `horizon-core` | Simulation primitives: Java `Random`s, `jmath` (HotSpot-exact `Math`), positions, noise, density, paletted storage, `version.rs` (the pinned version) |
 | `horizon-protocol` | Network protocol 777: codecs, framing, encryption, `packets/{handshake,status,login,configuration,play}.rs`, `entity_data.rs` |
@@ -54,12 +47,9 @@ Game workspace (root `Cargo.toml`); `launcher/` and `crates/horizon-telemetry-se
 | `horizon-prepare` | Builds `.local/horizon-client/26.3` from the player's own Minecraft install (runs the Java exporters) |
 | `horizon-server` | `horizon-server`: `server.toml`, CLI, supervisor of the headless game ([docs/hosting.md](docs/hosting.md)) |
 | `horizon-server-files` | `server.properties`, eula, ops/whitelist/bans, usercache |
-| `horizon-anticheat` | The dedicated server's anticheat, off by default: `[anticheat]` settings, violation levels, the checks' rules; the hub runs them (`lan/anticheat.rs`) ([docs/anticheat.md](docs/anticheat.md)) |
-| `horizon-cosmetics` | Cosmetic items Horizon clients draw on players (off by default): the item format, bones and animations ([docs/cosmetics.md](docs/cosmetics.md)) |
 | `horizon-friends`, `horizon-relay` | Play with Friends: invite codes, encrypted tunnel, the relay ([docs/play-with-friends.md](docs/play-with-friends.md)) |
-| `horizon-mods`, `cargo-horizon-mod` | Content mods (`.hmod`: manifest, content fence, no code), the registry index and `.hpack`, and `cargo horizon-mod` (`new`, `build`, `run`, `check`, `registry`) ([docs/mods.md](docs/mods.md)). Code mods are native, built by the launcher ([docs/native-mods.md](docs/native-mods.md)) |
+| `horizon-mods`, `horizon-mod-sdk`, `cargo-horizon-mod` | Sandboxed WebAssembly mods: runtime, SDK + WIT, `cargo horizon-mod` ([docs/mods.md](docs/mods.md)) |
 | `horizon-port-pack` | Porting Java modpacks ([docs/modpacks.md](docs/modpacks.md)) |
-| `horizon-optifine` | OptiFine-format pack files below every feature that reads them: `.properties`, the name/range/block matchers, paths and `optifine/` folders, and custom entity models (`cem/`: `.jem`/`.jpm` parsing and baking) |
 | `horizon-shader-api` | Horizon's own WGSL shader packs ([docs/api/shaders.md](docs/api/shaders.md)): `horizon-shaders.toml`, the `.hshader` package; shared by the game, the launcher and the registry |
 | `horizon-shaders` | Shader packs (the `shaders/` folder format), rebuilt clean-room from a written spec of the format; no wgpu |
 | `horizon-theme` | Design tokens and fonts for the launcher, the game's own menus and the website |
@@ -72,28 +62,18 @@ unittest discover -s tests`), `mods/horizon/src/test/java/dev/horizonlab/parity/
 `docs/`, `.github/workflows/`. The website (playhorizon.dev) is the private horizon-rust/horizon-site: its build
 reads `README.md`, `launcher/links.json`, `docs/api/`, `roadmap/roadmap.json` and `crates/horizon-theme/tokens.css` from main.
 
-## Write tests with signal
-
-- Test observable behavior, not words in docs, comments or source. Keep checks for machine-consumed contracts.
-- Use independent expected values or a vanilla oracle; do not derive the answer from the code under test.
-- Test outcomes, not only calls to stubs. Use mocks to isolate behavior, not as the behavior itself.
-- Skip tests of trivial constants, derives and getters, or behavior already covered by another test.
-- Avoid pinning implementation details; a harmless refactor should not break a behavior test.
-- Make slow tests faster without removing cases or weakening their coverage.
-- Never delete parity harnesses or tests that pin vanilla behaviour: they are the spec.
-
 ## Build and test fast
 
 ```sh
 python3 tools/pr_ready.py                  # the self-check: fmt, clippy -D warnings, touched crates' tests, harnesses; paste its block in the PR
 python3 tools/pr_ready.py --quick          # same without harnesses
-cargo test -p horizon-client -p horizon-client-lib --lib --bins --tests   # skips the 104 examples (pr_ready does this); `--doc` separately
-cargo test -p horizon-client-lib --lib mod_content::tests:: -- --ignored   # the 5 slow content-root tests, #[ignore]d; pr_ready runs them when mod content, assets, blocks or items change
+cargo test -p horizon-client --lib --bins --tests   # skips the 104 examples (pr_ready does this); `--doc` separately
+cargo test -p horizon-client --features horizon-client/mods --lib mod_content::tests:: -- --ignored   # the 5 slow content-root tests, #[ignore]d; pr_ready runs them when mod content, assets, blocks or items change
 cargo build --profile fast -p horizon-client        # optimized, quick to link: use it to play or run lan_e2e
 python3 tools/parity.py --changed origin/main       # the harnesses your branch can affect (CI's parity job)
 python3 tools/parity.py --changed-files paths.txt --list   # which harnesses cover these files, without running them
 python3 tools/parity.py mob_ai sculk       # named harnesses
-python3 tools/lan_e2e.py --check chest     # two real games over LAN (server-thread host)
+python3 tools/lan_e2e.py --check chest     # two real games over LAN (server-thread host); --in-frame compares the fallback
 python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 ```
 
@@ -104,17 +84,13 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
   + a Rust probe: `crates/<crate>/examples/<name>_{probe,fixture}.rs` (horizon-world 175, horizon-client 104),
   or the game binary with a fixture env var (`game/dispense_fixture.rs`, `game/sculk_fixture.rs`,
   `game/command_harness.rs`, `game/net_harness.rs`). Copy a nearby harness for a new one.
-- Developing a native mod? Run `horizon-launcher settings native-profile dev` once. `dev` builds the game crate
-  unoptimized: a mod edit rebuilds about 6× faster than with `performance`, while game logic runs up to about twice as
-  slow. Use it while developing, not for playing; `performance` stays the default for players and releases
-  ([docs/native-mods.md](docs/native-mods.md)).
 - Probes build into `.local/parity-target/`; harnesses find binaries via `lab.cargo_target()`, never `target/`.
-- Harness selection uses Cargo dep-info and reachable-code narrowing (`tools/parity_reach.py`).
-  `horizon-client-lib` builds the control tool and client probes without gameplay; their dep-info
-  excludes `game.rs` and `game/`, so gameplay edits do not rebuild or select those probes.
-  Source paths remain in `crates/horizon-client/`. Measure actual harness selection on refreshed
-  records with `tools/parity.py --changed-files paths.txt --list`; historical counts are not a guarantee.
+- What a change reruns (of 329 harnesses, measured 2026-10-23): a file of the game binary (`game.rs`, `game/`)
+  ~25, a file of the client lib ~103, of `horizon-world` ~103–109, of `horizon-core` ~119. Plan for it.
 - Rust integration tests: `crates/horizon-client/tests/` (`lan_bot.rs`, `generation_saves.rs`, `streaming_meshes.rs`).
+- **macOS:** `cargo build/test --workspace` may fail to link the two wasm guest cdylibs (undefined
+  `horizon:mods/events` symbols) until #1446 lands: add `--exclude coords-hud --exclude predator-missile --exclude horizon-mods-test-guest --exclude horizon-mods-test-ui-guest`.
+  Their real check is `cargo test -p horizon-mods` (builds them for `wasm32-unknown-unknown`).
 - Linux needs `libasound2-dev libudev-dev`; `--no-default-features` drops audio and controllers (the server build).
 - Run and drive the game (starts the `horizon-client` beside `horizon-ctl`; other arguments go to the game):
   `target/fast/horizon-ctl --socket $PWD/ctl.sock launch --world W --creative --offscreen --wait --resources $PWD/.local/horizon-client/26.3`,
@@ -123,9 +99,6 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 
 ## Vanilla reference
 
-- Start parity work from the port ledger, not grep: `python3 tools/port_ledger.py issue N` (or `where
-  Class.method`, `what file:line`), and `check --base origin/main` before the PR. How:
-  [.claude/skills/vanilla-parity/SKILL.md](.claude/skills/vanilla-parity/SKILL.md), [docs/port-ledger.md](docs/port-ledger.md).
 - Decompiled sources: `.local/minecraft/26.3/sources/{client,server}/` (`python3 tools/lab.py decompile`).
 - Bytecode queries (callers through lambdas, every overload):
   `python3 tools/rea_vanilla.py method net.minecraft.world.level.block.DispenserBlock dispenseFrom`
@@ -137,18 +110,14 @@ python3 tools/agent_control_e2e.py         # horizon-ctl / MCP end to end
 
 ## horizon-client: where things live
 
-`L:` = lib (`crates/horizon-client/src/`, or `crates/horizon-client-render/src/` for the modules that crate holds, under
-the same `horizon_client::<module>` paths), `G:` = gameplay (`crates/horizon-client/src/game/`), also in the lib in normal builds.
-Gameplay keeps its `horizon_client::<module>` imports through a self-crate alias. The executable
-contains only the allocator, mod API marker and a call to `entry::main`. For unit tests, the lib
-excludes `entry` and `game`, and the executable test target owns `game` so its process-wide test
-state stays separate from the library tests. This compiles gameplay twice for executable tests.
+`L:` = lib (`crates/horizon-client/src/`), `G:` = bin (`crates/horizon-client/src/game/`). The lib can't see
+`Game`; bin code reaches the lib as `horizon_client::<module>`.
 
 | Subsystem | Files |
 |---|---|
 | Game loop, tick, frame | `game.rs`: `fn run`, `impl ApplicationHandler for Game` (`window_event`, `about_to_wait`), `fn tick`, `fn tick_world`, `fn render`; L: `clock.rs`, `spans.rs`; `horizon-client-input/src/window.rs` |
 | Rendering | L: `gfx.rs` (`Renderer::new`, `Renderer::render`), `gfx/` (cull, occlusion, translucency, upload, timing, lod, weather, stars, end_sky), `*.wgsl`, `particles.rs`, `block_entity_render.rs`, `item_render.rs`, `fog.rs`, `clouds.rs`, `camera.rs`, `first_person.rs`; G: `render_tick.rs`, `item_draw.rs` |
-| Chunks, streaming, light | L: `streaming.rs` (worker pool: generate, light, mesh), `world.rs`, `chunk.rs`, `chunk_map.rs`, `light.rs`, `mesher.rs` + `mesher/`, `vanillagen.rs` (binds horizon-world's generator), `lod.rs` + `lod/`, `server_terrain.rs` (a server's kept chunks), `bluemap.rs` + `bluemap_detect.rs` (far terrain from its web map), `ticket_levels.rs`; G: `world_loading.rs`, `postprocess.rs`; game.rs `fn update_world` |
+| Chunks, streaming, light | L: `streaming.rs` (worker pool: generate, light, mesh), `world.rs`, `chunk.rs`, `chunk_map.rs`, `light.rs`, `mesher.rs` + `mesher/`, `vanillagen.rs` (binds horizon-world's generator), `lod.rs` + `lod/`, `ticket_levels.rs`; G: `world_loading.rs`, `postprocess.rs`; game.rs `fn update_world` |
 | World generation | `crates/horizon-world/src/worldgen/` (`generator*.rs`, `feature_graph.rs`, `structure/`, `carver/`) |
 | Block behaviour | `crates/horizon-world/src/level/` (`mod.rs`, `tick.rs`, `hooks.rs`, `redstone.rs`, `place.rs`, `interact.rs`); game.rs `fn tick_blocks`, `fn process_level_events` |
 | Mobs | L: `mobs.rs` (types), `mobs/` (`ai.rs`, `goals.rs`, `brain.rs`, `*_brain.rs`, `nav.rs`, `path.rs`, `species.rs`, `spawning.rs`, `render.rs`, `anim.rs`); G: `creatures.rs` (ticking, spawning, mob events), one file per mob family (`dragon.rs`, `wither.rs`, `villagers.rs`, `piglins.rs`, `golems.rs`...), `natural_spawning.rs` |
@@ -160,11 +129,11 @@ state stays separate from the library tests. This compiles gameplay twice for ex
 | Multiplayer client | L: `net.rs` (network thread); G: `remote.rs` (`fn handle_packet`, `fn tick_remote`), `remote_*.rs` (mob data, objects, projectiles, vehicles, stations) |
 | LAN host / server side | L: `lan/` (`conn.rs` handshake + login threads, `hub.rs` + `hub/` play state, `chunks.rs`, `entity.rs`, `tracking.rs`, `guest.rs`, `playerdata.rs`); G: `lan.rs` (`LanHost`), `lan_actions.rs` (`fn as_guest`, `fn tick_guests`), `lan_*.rs` per feature, `lan_entities.rs` (tracked entities) |
 | Integrated server | G: `integrated.rs` (the server thread), `levels.rs` (one level per dimension, `fn tick_server`), `server_travel.rs` |
-| Dedicated server | G: `dedicated.rs`, `dedicated/status.rs`; crates `horizon-server-files`, `horizon-server`, `horizon-anticheat` (L: `lan/anticheat.rs`) |
+| Dedicated server | G: `dedicated.rs`, `dedicated/status.rs`; crates `horizon-server-files`, `horizon-server` |
 | Save and load | L: `save.rs` (level.dat, regions, playerdata), `entity_nbt.rs`, `options_file.rs`; `horizon-client-core/src/block_entity_nbt.rs`; G: `saving.rs`, `persist.rs` (entities); `crates/horizon-world/src/{region.rs,nbt.rs,datafix/}` |
 | Input | game.rs `fn window_event`, `fn key_pressed`, `fn play_mouse`; crate `horizon-client-input` (`keybinds.rs`, `keymapping.rs`, `key_names.rs`, `mouse.rs`, `input.rs`, `interaction_input.rs`, `gamepad.rs`, `clipboard.rs`); L: `osk.rs`; G: `pad.rs`, `pad_menu.rs` |
 | Audio | L: `audio.rs` (mixer), `sound_engine.rs`, `sound_events.rs`, `music.rs`, `ambience.rs`; G: `music.rs`, `subtitle_hud.rs` |
-| Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`, `mobs/cem.rs` + `mobs/cem_anim.rs` (OptiFine/EMF entity models and their animations); `horizon-client-core/src/lang.rs`; crates `horizon-assets`, `horizon-optifine`; G: `packs.rs` |
+| Resource packs | L: `packs.rs` + `packs/`, `pack_screen.rs`, `atlas_sources.rs`, `sprites.rs`, `mipmap.rs`, `model_library.rs`, `font.rs`; `horizon-client-core/src/lang.rs`; crate `horizon-assets`; G: `packs.rs` |
 | Agent control | L: `control.rs` (socket), `bin/horizon-ctl/`; G: `control.rs`, `agent.rs`, `events.rs`, `ui_control.rs` ([docs/agent-control.md](docs/agent-control.md)) |
 | Mods | crate `horizon-mods`; G: `mods.rs`; L: `mod_content.rs`, `mod_list.rs` |
 | Horizon extras, settings | L: `extras.rs`, `graphics.rs`, `settings.rs`, `minimap.rs`; G: `extras.rs`, `tweaks.rs`, `options.rs` |
@@ -173,34 +142,37 @@ state stays separate from the library tests. This compiles gameplay twice for ex
 
 - `struct Game` (game.rs, ~290 fields) holds everything. Its methods are spread over ~180 files: game.rs keeps
   the core (tick, render, input, inventory, world open/close) and each `game/<feature>.rs` adds an
-  `impl Game<'_>` block for one feature, with its own state types. Fields stay private to the gameplay module and its descendants. Gameplay tests run in the gameplay library, separate from reusable-library tests.
+  `impl Game<'_>` block for one feature, with its own state types. Fields are private to the bin.
 - Find a feature's code: `grep -rn "fn tick_<thing>\|fn <verb>_<thing>" crates/horizon-client/src/game*`;
   the file is usually `game/<thing>s.rs`. Who calls it: grep the name in game.rs's `fn tick` / `fn tick_world`.
 - Fields that say which mode runs: `remote` (this window is a client of a server: multiplayer, LAN guest, or
   single player on its server thread), `lan` (`LanHost`: this world is open to the network), `integrated`
   (the window's own server thread), `serving` (this `Game` *is* that server thread), `options.dedicated`.
-  `fn tick` returns `tick_remote()` when `remote` is set; a server ticks its levels (`fn tick_world`).
-- A server's players run through the shared gameplay code: `as_guest` swaps the guest's
+  `fn tick` returns `tick_remote()` when `remote` is set; nothing else of the local simulation runs.
+- A server's players run through the same gameplay code as the local player: `as_guest` swaps the guest's
   state (position, inventory, mode, mining, item use) into `Game` for one call (`game/lan_actions.rs`), and
   `levels.rs` swaps whole dimensions in the same way. Changes reach clients through the block log, level
   events and the entity tracker (`lan/tracking.rs`, `game/lan_entities.rs`).
 - Shared read-only data: `Resources` (`res`: blocks, items, recipes, mob types, biomes) and `PackResources`
   (`pack`), both in game.rs.
 
-## Single player runs on a server thread
+## The two single-player paths
 
-`game/integrated.rs` runs a second `Game` (`serving`) on a "Server thread" with one level per dimension;
-the window joins it as a client through memory (`remote`), exactly as a LAN guest or a dedicated server's
-player does (#1514). A window's `Game` never ticks a world itself: the old in-frame path is gone
-(`--in-frame` and `--no-server-thread` only print a notice; `HORIZON_SERVER_THREAD` is ignored).
-Open `[server-thread]` issues list the gaps left.
+1. **Server thread (default since #1514):** `game/integrated.rs` runs a second `Game` (`serving`) on a
+   "Server thread" with one level per dimension; the window joins it as a client through memory (`remote`),
+   exactly as a LAN guest or a dedicated server's player does. This is what players run. Open
+   `[server-thread]` issues list the gaps left.
+2. **In-frame (`--in-frame`, `--no-server-thread` or `HORIZON_SERVER_THREAD=0`):** the window's `Game` ticks
+   the world itself, one level that follows the player (`fn enter_dimension`). Deterministic rule fixtures still use this path; player-facing integration uses the default server thread.
 
-Single player, LAN guests and dedicated servers all run the server code, so a fix there serves all three.
-Test the server thread when you touch player-facing gameplay:
+LAN guests and dedicated servers always use the server code, so a fix there serves both. Test both paths
+when you touch player-facing gameplay:
 
 ```sh
 cargo run --profile fast -p horizon-client -- --resources .local/horizon-client/26.3 --world T               # server thread
+cargo run --profile fast -p horizon-client -- --resources .local/horizon-client/26.3 --world T --in-frame    # in-frame
 python3 tools/lan_e2e.py --check <name>                  # host on its server thread, guest is a server client
+python3 tools/lan_e2e.py --in-frame --check <name>       # comparison (portals, levels, distance, lava need server-thread mode)
 python3 tools/parity.py dedicated_server server_entities server_player_damage
 ```
 

CONTRIBUTING.md

@@ -2,11 +2,10 @@
 
 Thanks for helping. Horizon is Minecraft: Java Edition 26.3 rewritten in Rust, and the one rule that shapes
 everything is that **it plays exactly like vanilla**. This page is the short version of how we work; questions are
-welcome on [Discord](https://discord.gg/playhorizon).
+welcome on [Discord](https://discord.gg/HcTeMZxe5E).
 
 This repository holds the game and the launcher, plus the tools, tests and docs that build, check and release them.
-The website (playhorizon.dev) is built in a separate repository from this one's README, `docs/api/` and roadmap. Anything
-else (videos, Discord and other community material) lives elsewhere.
+The website (playhorizon.dev) is built in a separate repository from this one's README, `docs/api/` and roadmap. Anything else (videos, Discord and other community material) lives elsewhere.
 
 **Where to start: [playhorizon.dev/hub](https://playhorizon.dev/hub).** It shows what is being done now and next
 ([ROADMAP.md](ROADMAP.md) in the repository), the work board, good first tasks, and the forms to report a bug or
@@ -15,25 +14,23 @@ queue (the hub, or `/suggest` on Discord) rather than to issues, which are for b
 
 ## Build it
 
-- **Prerequisites:** Rust (stable), Python 3.10+, JDK 25, and on Linux the ALSA and udev headers
-  (`libasound2-dev libudev-dev`).
-- **Resources:** Horizon never downloads the game; it prepares its resources from your own copy of Minecraft 26.3, as
-  described in [Build from source](README.md#build-from-source).
-- **Commands:**
+You need Rust (stable), Python 3.10+, JDK 25, and on Linux the ALSA and udev headers (`libasound2-dev libudev-dev`).
+Horizon never downloads the game: it prepares its resources from your own copy of Minecraft 26.3, as described in
+[Build from source](README.md#build-from-source).
 
-  ```sh
-  cargo run --release -p horizon-prepare -- --prepare --server-jar ~/Downloads/server.jar
-  cargo run --release -p horizon-client
-  ```
+```sh
+cargo run --release -p horizon-prepare -- --prepare --server-jar ~/Downloads/server.jar
+cargo run --release -p horizon-client
+```
 
-- **Launcher:** its own Cargo workspace in `launcher/` (`cd launcher && cargo run`; on NixOS, `nix-shell` first).
+The launcher is its own Cargo workspace in `launcher/` (`cd launcher && cargo run`; on NixOS, `nix-shell` first).
 
 ## Vanilla first
 
-Wherever vanilla has a feature, vanilla is the specification, down to the order of random calls. "Parity" here means
-Horizon gives the same results as the pinned 26.3 client and server for the same inputs, checked by a **harness**: a
-`tools/test_*_parity.py` script that runs a small Java oracle against the real game and a Rust probe against Horizon,
-and compares their outputs. There are about 290 of them.
+Wherever vanilla has a feature, vanilla is the specification, down to the order of random calls. "Parity" here
+means Horizon gives the same results as the pinned 26.3 client and server for the same inputs, checked by a
+**harness**: a `tools/test_*_parity.py` script that runs a small Java oracle against the real game and a Rust
+probe against Horizon, and compares their outputs. There are about 290 of them.
 
 - **Read the vanilla code before writing Horizon's.** `tools/rea_vanilla.py` queries the pinned game bytecode:
   `python3 tools/rea_vanilla.py method net.minecraft.world.level.block.DispenserBlock dispenseFrom`.
@@ -44,35 +41,20 @@ and compares their outputs. There are about 290 of them.
   off by default wherever they would change the vanilla look.
 - **Everything players run is Rust.** Python and Java are fine for dev tools and harness drivers in `tools/`, never
   for player-facing code.
-- **No game files in the repo.** Never commit game files, decompiled source or prepared resources (`.local/`):
-  `tools/check_public_tree.py` rejects them (`git config core.hooksPath .githooks` runs it before every commit).
-  The pre-push hook checks the full history reachable from the branches and tags being pushed. Run
-  `python3 tools/check_public_tree.py --history` to audit the history of all local refs.
 
-## Only original code, or code whose license allows it
+Never commit game files, decompiled source or prepared resources (`.local/`): `tools/check_public_tree.py` rejects
+them (`git config core.hooksPath .githooks` runs it before every commit).
+The pre-push hook checks the full history reachable from the branches and tags being pushed. Run
+`python3 tools/check_public_tree.py --history` to audit the history of all local refs.
 
-Horizon is MIT. Its code is written from Minecraft 26.3 itself and from public documentation. Since 30 October 2026
-another project's source may also be read and used, **only when that project's license allows it**:
+## Only original code
 
-- **Allowed:** MIT, MIT-0, BSD-2-Clause, BSD-3-Clause, 0BSD, ISC, zlib, Apache-2.0, Unlicense, and the CC0-1.0
-  public-domain dedication. That code may be read, copied or adapted.
-- **Off limits, even to read:** GPL, LGPL (Iris), AGPL, MPL, EPL, Polyform (Sodium), the Creative Commons licenses
-  (CC BY, CC BY-SA, CC BY-NC and the others; CC0 is a public-domain dedication, not one of them), custom or
-  "source available" licenses, all rights reserved (OptiFine), and any project with no license or an unclear one.
-  Don't read, copy, translate or paraphrase their source, and don't send code an AI tool wrote from it. Being able
-  to download a mod or a pack does not give you the right to read its files.
-- **Check the license yourself.** Read the LICENSE file at the commit you use and the header of each file you take:
-  some repositories mix licenses, and a file under another license is off limits. A license that changed: the one at
-  your commit counts. In doubt, don't: ask in #contributors first.
-- **Say it in the pull request:** the project, a link to the commit, its license, and what you read or copied. A
-  pull request that used another project's source without saying so is closed.
-- **Copied or adapted code** keeps its copyright line and license notice at the top of the file, and gets an entry
-  in [THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md). Apache-2.0 code also keeps its NOTICE text and says what
-  was changed.
-
-User documentation and file formats are fine to read, and packs and mods are fine to run and observe, whatever their
-license. Shader packs are a clean-room rewrite of the pack format, produced from a written description of it (see
-#1561); they carry no foreign source, and the rules above still apply to anything you read while working on them.
+Horizon's code is written from Minecraft 26.3 itself and from public documentation, never from another mod, loader
+or renderer. Don't read, copy, translate or paraphrase the source of Iris, OptiFine, Sodium or any other project,
+and don't send code an AI tool wrote from it. Their user documentation and file formats are fine to read, and their
+packs and mods are fine to run and observe. Shader packs were removed on 24 October 2026 (#1561) because their code
+had been written from another project's source; they come back only as a clean-room rewrite from a written
+description of the pack format.
 
 ## Before asking for review
 
@@ -88,25 +70,10 @@ your change can affect. Without the vanilla data on your machine it lists those
 `--quick` skips the harnesses. It exits non-zero when something fails.
 
 For the game workspace, Clippy checks all targets of the touched crates and their transitive workspace dependents,
-including examples. The dependency scope includes optional, platform, build and development dependencies. Tests run
-library, binary, integration and doc tests without building unrelated example executables. Shared Cargo
+including examples. The dependency scope includes optional, platform, build and development dependencies.
+Tests run library, binary, integration and doc tests without building unrelated example executables. Shared Cargo
 configuration and toolchain changes select the whole workspace; CI also keeps its workspace-wide checks.
 
-## Claim before you start
-
-Work is tracked in GitHub issues, and an issue that is assigned is taken (so is one with the `in progress` label:
-claimed on Discord with Kira's `/claim`): pick another, or ask its holder in the thread. Before you start, comment
-**`/claim`** on the issue; you are assigned at once, no role needed. No issue for your work yet? Open one (a line is
-enough), then claim it. `/unclaim` gives it back. Issues labelled `tracker`, `proposal` or `not claimable` aren't
-claimed whole: claim one of the issues a tracker lists, or open one for the part you take.
-
-A claim with no open pull request linking the issue (`Fixes #123` in the description, or a draft) is released after
-5 days, with a comment: open a draft early. You can hold 8 open issues at a time, not counting the ones your
-pull requests already fix. Agents claim the same way.
-
-When your pull request changes the same functions as another open one, or closes the same issue, a bot comment names
-it (edited on every push, never repeated): talk to its author in the thread before you both finish the same work.
-
 ## Pull requests
 
 - **Small.** One change per pull request, under about 500 lines of code where you can; split bigger work into
@@ -115,17 +82,9 @@ it (edited on every push, never repeated): talk to its author in the thread befo
   can see.
 - **Tick "Allow edits by maintainers".** When something small is left (a lint, a rebase, a nit) we push the fixup
   ourselves instead of sending it back to you; only design questions come back.
-- **Once we've pushed to your branch, merge main into it; don't rebase or force-push.** A rebase or force-push
-  replaces our commits with yours and erases the fixes we added (it happened on #5188 and #5203). Tell your agent
-  too: `git merge origin/main`, never `git rebase` or `git push --force` on a branch a maintainer has touched. If
-  our fixes get erased anyway, we finish the work in our own pull request that keeps your commits and credits you.
-- **Tick its kind** in the template: `parity` (Horizon now does what vanilla does), `bug` (a crash or breakage),
-  `perf`, `feature` (new for players), `extra` (Horizon-only, off by default), `tooling` or `docs`. A workflow sets
-  that label, and area labels (`launcher`, `mobs`, `worldgen`, `rendering`...) from the paths you change.
-  `label:parity` is the list of real progress toward vanilla.
-- **Release labels** (we set them if you can't): `feature` also puts it under "New" in the release notes,
-  `skip-release` when players see no change (tooling, docs, tests), nothing for a fix. `release-now` is for crash
-  fixes that shouldn't wait. pr_ready suggests one.
+- **Labels** (we set them if you can't): `feature` when players get something new (it appears under "New" in the
+  release notes), `skip-release` when players see no change (tooling, docs, tests), nothing for a fix.
+  `release-now` is for crash fixes that shouldn't wait. pr_ready suggests one.
 
 Who reviews and merges: the Horizon Team, on CI for ordinary pull requests; risky ones (saves, network, world
 generation, the launcher's updates) wait for a local proof first ([merging](docs/release-flow.md#merging)).
@@ -142,5 +101,5 @@ new pushes, we add it again.
 
 ## Talk to us
 
-[Discord](https://discord.gg/playhorizon) for questions and ideas, [issues](https://github.com/horizon-rust/horizon/issues)
-for bugs. To take something on, `/claim` its issue ([above](#claim-before-you-start)).
+[Discord](https://discord.gg/HcTeMZxe5E) for questions and ideas, [issues](https://github.com/horizon-rust/horizon/issues)
+for bugs. If you want to take something on, say so in its issue so nobody else starts the same work.

Cargo.toml

@@ -1,25 +1,17 @@
 [workspace]
-exclude = ["launcher", "crates/horizon-telemetry-server", "crates/horizon-mod-registry", "third_party/wgpu-hal", "third_party/naga", "third_party/libmimalloc-sys"]
+exclude = ["launcher", "crates/horizon-telemetry-server", "crates/horizon-mod-registry", "third_party/wgpu-hal"]
 members = [
     "crates/horizon-core",
     "crates/horizon-dualsense",
-    "crates/horizon-narrator",
     "crates/horizon-threads",
     "crates/horizon-hdr",
     "crates/horizon-world",
     "crates/horizon-client",
-    "crates/horizon-client-lib",
     "crates/horizon-client-core",
     "crates/horizon-client-input",
-    "crates/horizon-client-render",
-    "crates/horizon-cosmetics",
     "crates/horizon-command",
     "crates/horizon-items",
     "crates/horizon-server-files",
-    "crates/horizon-anticheat",
-    "crates/horizon-chat-filter",
-    # The Model Context Protocol, shared by horizon-ctl, horizon-server and the launcher.
-    "crates/horizon-mcp",
     "crates/horizon-server",
     "crates/horizon-bots",
     "crates/horizon-assets",
@@ -30,16 +22,26 @@ members = [
     "crates/horizon-bench",
     "crates/horizon-friends",
     "crates/horizon-relay",
+    "crates/horizon-mod-sdk",
     "crates/horizon-mods",
-    "crates/horizon-mod-api-gen",
-    "crates/horizon-mod-api-gen/dispatch-tests",
+    "crates/horizon-mods/tests/guest",
+    "crates/horizon-mods/tests/ui_guest",
     "crates/cargo-horizon-mod",
     "crates/horizon-port-pack",
     "crates/horizon-shaders",
-    "crates/horizon-optifine",
     "crates/horizon-shader-api",
     "crates/horizon-release-sign",
+    "crates/horizon-mod-sdk/examples/coords-hud",
+    "crates/horizon-mod-sdk/examples/predator-missile",
+    "crates/horizon-mod-sdk/examples/welcome",
+    "crates/horizon-mod-sdk/examples/beacons",
+    "mods/official/fps-overlay",
+    "mods/official/keystrokes",
+    "mods/official/far-view",
+    "mods/official/minimap",
+    "mods/official/zoom",
     "xtask",
+    "mods/official/recipes",
 ]
 resolver = "2"
 
@@ -62,18 +64,9 @@ large_enum_variant = "allow"
 # UHD 620/630) crashes on it with an access violation (#746). It also fixes the
 # Metal backend's lookup of the CoreGraphics HDR colour space names, which handed
 # CoreGraphics a symbol's address as the string and crashed HDR output on macOS.
-# And gfx-rs/wgpu#10714: on Windows, Vulkan waits for the acquire fence only in
-# FIFO (VSync), where it was meant to pace frames; with VSync off it made every
-# frame wait for the GPU to finish the one before (#4604).
-# Drop this and the folder once a wgpu release has these fixes.
+# Drop this and the folder once a wgpu release has both fixes.
 [patch.crates-io]
 wgpu-hal = { path = "third_party/wgpu-hal" }
-# naga 30.0.1, with the fixes to its GLSL frontend that shader packs need (THIRD_PARTY_NOTICES.md).
-naga = { path = "third_party/naga" }
-# libmimalloc-sys 0.1.49 whose mimalloc v3 counts bits without POPCNT when MSVC builds it: the
-# game died before main on CPUs without it (Core 2, #7264; THIRD_PARTY_NOTICES.md). Drop this and
-# the folder once a libmimalloc-sys release has microsoft/mimalloc#1291's fix.
-libmimalloc-sys = { path = "third_party/libmimalloc-sys" }
 
 # Line tables keep file:line in backtraces; full debug info made every
 # example and test binary hundreds of megabytes and slow to link.

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="docs/media/banner.webp" alt="The Horizon website: the game you know, rebuilt in Rust" width="100%">
+  <img src="docs/media/banner.webp" alt="Horizon: Minecraft: Java Edition 26.3, rewritten in Rust and checked against vanilla by 281 differential harnesses" width="100%">
 </p>
 
 <p align="center">
@@ -7,7 +7,6 @@
   <img src="https://img.shields.io/badge/Minecraft-Java%2026.3-5D9C3F" alt="Minecraft Java 26.3">
   <img src="https://img.shields.io/badge/Rust-stable-B7410E?logo=rust&logoColor=white" alt="Rust">
   <img src="https://img.shields.io/badge/vanilla%20parity-100%25-F0795A" alt="Vanilla parity 100%">
-  <a href="#project-status"><img src="https://img.shields.io/badge/player--visible%20gaps-0%20open-F0795A" alt="Player-visible gaps open"></a>
   <img src="https://img.shields.io/badge/platform-Linux%20%7C%20macOS%20%7C%20Windows-2A2470" alt="Linux, macOS and Windows">
   <a href="LICENSE"><img src="https://img.shields.io/badge/license-MIT-3B2F7E" alt="MIT license"></a>
 </p>
@@ -24,32 +23,34 @@
 
 # Horizon
 
-Minecraft: Java Edition 26.3, rewritten in Rust. Same worlds, same rules, same terrain, checked against the Java game by more than 300 differential harnesses. Free, open source and unofficial.
+Horizon is Minecraft: Java Edition 26.3 rewritten in Rust: a native game that reads the same worlds, follows the same rules and generates the same terrain as the Java game, and is checked against it by 281 differential harnesses. You play it through a small launcher, on the files from your own copy of Minecraft. It is free, open source and unofficial.
 
-> Not an official Minecraft product, nor approved by or associated with Mojang or Microsoft. Horizon contains no Minecraft code, assets or data: you need your own copy of Java Edition 26.3.
+> 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
 
-Get **the Horizon launcher** from [playhorizon.dev](https://playhorizon.dev) or [the launcher releases](https://github.com/horizon-rust/horizon/releases?q=launcher&expanded=true) (Linux x86-64, macOS on Apple Silicon, macOS on Intel from the next Nightly, Windows x64). It installs and updates the game, prepares its files from your copy of Minecraft, and updates itself.
+Horizon is installed through **the Horizon launcher**. Get it from [playhorizon.dev](https://playhorizon.dev) (the Download button picks your system) or from [the launcher releases](https://github.com/horizon-rust/horizon/releases?q=launcher-v&expanded=true), for Linux x86-64, macOS on Apple Silicon or Windows x64. The launcher installs and updates the game, prepares its files from your copy of Minecraft (your own install, or downloaded from Mojang for your account), and updates itself.
 
-**You need** a Microsoft account that owns Java Edition ([why](docs/microsoft-account.md)) and a GPU with Vulkan or OpenGL 3.3 (Linux), Vulkan or DirectX 12 (Windows), or a Mac (Apple Silicon, or Intel from the next Nightly). An existing Minecraft install (official launcher, Prism, MultiMC...) is reused; without one, Play downloads 26.3 from Mojang for your account. Step by step: [Install and first launch](https://playhorizon.dev/docs/install).
+**You need** a Microsoft account that owns Minecraft: Java Edition (the launcher signs in with it, as other launchers do; see [Microsoft account](docs/microsoft-account.md)) and a GPU with Vulkan on Linux and Windows, or any Apple Silicon Mac. Nothing else: with no Minecraft on your computer, Play downloads 26.3 and the Java it needs from Mojang for your account, as the official launcher does, then prepares it once. An install you already have (the official launcher, Prism, MultiMC and other launchers all work) is used instead. Step by step, with macOS's first-open prompt and the first launch: [Install and first launch](https://playhorizon.dev/docs/install).
 
 <table>
   <tr>
-    <td width="50%"><img src="docs/media/launcher-play.webp" alt="The launcher's Home page: the selected instance ready to play, the version picker, Join a friend and the instance's tabs"></td>
-    <td width="50%"><img src="docs/media/launcher-settings.webp" alt="The launcher's Settings page: Microsoft account, offline name, updates, appearance and accent colour"></td>
+    <td width="50%"><img src="docs/media/launcher-play.webp" alt="The launcher's Play page: a version ready to play, its summary, Client and Server, the version picker and Play"></td>
+    <td width="50%"><img src="docs/media/launcher-patch-notes.webp" alt="The launcher's Patch notes page"></td>
   </tr>
 </table>
 
 ## What works today
 
-- **The game:** vanilla world generation, mobs, villagers, raids, redstone, every command, the HUD and the recipe book, on vanilla saves. Worlds from 1.8 to 26.2 are upgraded. [Status](#project-status).
-- **Extras:** new menus, graphics presets, distant terrain up to 1024 chunks, controllers, zoom, minimap and more, off by default where they change the vanilla look. [Settings](https://playhorizon.dev/docs/settings).
-- **Packs:** resource packs, and data packs with functions, predicates, item modifiers and world generation.
-- **Multiplayer:** invite friends with a code, Open to LAN, join servers (online mode included). [Multiplayer](https://playhorizon.dev/docs/multiplayer).
-- **Mods:** content mods (blocks, items, data) and native Rust mods, built by the launcher with nothing to install. Java mod jars do not run. [Mods](https://playhorizon.dev/docs/mods).
+The [documentation](https://playhorizon.dev/docs/) covers each of these.
 
-In the Rust client, with vanilla assets and no mods or shaders:
+- **The game:** singleplayer with vanilla's world generation, mobs, villagers, raids, redstone, every command, the HUD and the recipe book, on saves in vanilla's format. Worlds from 1.8 to 26.2 are upgraded as vanilla does. [Status table](#project-status).
+- **Horizon's own extras:** new menus (vanilla's are one setting away), graphics presets, distant terrain up to 1024 chunks, controller support, optional zoom, minimap and more, all off by default where they would change the vanilla look. See [Settings](https://playhorizon.dev/docs/settings).
+- **Resource packs and data packs:** resource packs work, and data packs load functions, predicates and item modifiers.
+- **Playing with others:** invite friends from the pause menu's Friends button with a code, Open to LAN, and joining servers, online-mode ones with the Microsoft account the launcher signs in with. See [Multiplayer](https://playhorizon.dev/docs/multiplayer).
+- **Mods:** Horizon has its own mod system (Rust compiled to WebAssembly). Java mod jars do not run. See [Mods and data packs](https://playhorizon.dev/docs/mods).
+
+Screenshots, captured in the Rust client itself with vanilla assets and no mods or shaders:
 
 <table>
   <tr>
@@ -67,15 +68,15 @@ In the Rust client, with vanilla assets and no mods or shaders:
 
 ## Host a server
 
-The launcher's **Servers** page creates, starts, backs up and updates a server, and invites friends over Tailscale. On a VPS, `horizon-server` installs with one command and needs no Java. [Host a server](https://playhorizon.dev/docs/hosting) ([reference](docs/hosting.md)).
+The launcher's **Servers** page creates, starts, backs up and updates a Horizon server with buttons, and invites friends over Tailscale. On a VPS, `horizon-server` installs with one command and runs without Java. Guide: [Host a server](https://playhorizon.dev/docs/hosting) ([reference](docs/hosting.md)).
 
 ## Modpacks
 
-The launcher imports Modrinth and CurseForge packs and plays the mods Horizon can carry over: today, content mods made of data and assets, not Java code. [Modpacks](https://playhorizon.dev/docs/modpacks).
+The launcher's **Modpacks** page imports a Modrinth or CurseForge pack, shows which of its mods Horizon can carry over, and plays the ones it can as their own profile. Today that means content mods made of data and assets; mods with Java code are not ported yet. See [Modpacks](https://playhorizon.dev/docs/modpacks).
 
 ## Agent control
 
-AI agents and scripts can play Horizon. `horizon-ctl`, shipped with the game, reads its state as JSON and acts like a player; `horizon-ctl mcp` serves the same commands over MCP.
+AI agents and scripts can play Horizon. `horizon-ctl`, shipped beside the game in every release folder, is a command line that reads the game as JSON and acts like a player; `horizon-ctl mcp` serves the same commands as an MCP server (one tool per command, screenshots returned as images).
 
 ```sh
 horizon-ctl launch --world Survival --seed 5 --wait   # finds the version the launcher installed
@@ -86,14 +87,16 @@ horizon-ctl break -1 65 -3                              # mines it; replies with
 horizon-ctl open-inventory && horizon-ctl click-slot 0  # menus: slots, buttons by label, text fields
 ```
 
-Commands block until done and reply with the result; `horizon-ctl help` lists them all. [Agent control](docs/native-client.md#agent-control-horizon-ctl-and-mcp).
+Commands block until the action is done and reply with what happened; errors are JSON with distinct exit codes, `horizon-ctl help` lists every command and `horizon-ctl COMMAND --help` explains one with examples. It talks to the game over a Unix socket on Linux and macOS and over a token-protected localhost port on Windows. See [Agent control in the native client guide](docs/native-client.md#agent-control-horizon-ctl-and-mcp).
 
 ## Build from source
 
-Needs Rust 1.90+, Python 3.10+, JDK 25, and on Linux `libasound2-dev libudev-dev`. `horizon-prepare` builds the game's resources from **your own copy** of Java Edition 26.3 (checked against `research-lock.json`) and never downloads it:
+For developers. Requirements: Rust 1.90 or newer, Python 3.10 or newer, JDK 25, and on Linux the ALSA and udev development headers (`libasound2-dev libudev-dev` on Debian and Ubuntu). Development and the vanilla harnesses run on Linux.
 
-1. **Client:** play 26.3 once in the official launcher. Horizon reads `~/.minecraft` (or `--minecraft-dir` / `HORIZON_MINECRAFT_DIR`).
-2. **Server jar:** the 26.3 server jar (`downloads.server.url` in `versions/26.3/26.3.json`), passed once with `--server-jar` or `HORIZON_SERVER_JAR`.
+Horizon contains no game files, and `horizon-prepare` never downloads them (the launcher downloads them from Mojang only for a signed-in account that owns the game). 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:** 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/horizon-rust/horizon.git
@@ -103,57 +106,65 @@ cargo run --release -p horizon-prepare -- sounds   # optional: sounds from your
 cargo run --release -p horizon-client
 ```
 
-Prepared files land in the gitignored `.local/`: never commit or share them. Options, controls and architecture: [the native client guide](docs/native-client.md); all developer docs: [docs/README.md](docs/README.md).
+Everything prepared lands in the gitignored `.local/`. It is derived from the game: never commit it or share it.
+
+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 developer documentation is indexed in [docs/README.md](docs/README.md), including [the parity workflow](docs/parity-workflow.md).
 
 ## Roadmap
 
-What is in progress, what comes next and where to help: [ROADMAP.md](ROADMAP.md), or [playhorizon.dev/hub](https://playhorizon.dev/hub) with the work board and what shipped.
+What is being done now, what comes next and where you can help, in plain words and in technical detail: [ROADMAP.md](ROADMAP.md). [playhorizon.dev/hub](https://playhorizon.dev/hub) shows it with the work board, the journal of what shipped and how to help.
 
 ## Contributing
 
-Issues and pull requests are welcome: read [CONTRIBUTING.md](CONTRIBUTING.md) (vanilla first, small pull requests). Questions: [Discord](https://discord.gg/playhorizon). Before a pull request, run the self-check and paste its output:
+Issues and pull requests are welcome: see [CONTRIBUTING.md](CONTRIBUTING.md) for how we work (vanilla first, small pull requests, labels), or [the contributing guide](https://playhorizon.dev/docs/contributing) on the site. Questions and ideas: [Discord](https://discord.gg/HcTeMZxe5E). Before opening a pull request, run the self-check and paste the block it prints:
 
 ```sh
 git config core.hooksPath .githooks
 python3 tools/pr_ready.py
 ```
 
-It runs rustfmt, clippy, the touched crates' tests, the Python tests, the public-tree check and the vanilla harnesses your change affects. Never commit game files, decompiled source or prepared resources.
+It runs rustfmt, clippy with warnings denied, the tests of the crates you touched, the Python tests, the public-tree check, and the vanilla harnesses your change can affect. CI runs the same checks on GitHub's Linux runners; the vanilla harnesses need the game, which Horizon never downloads, so they run on a maintainer's computer holding their own copy. Never commit game files, decompiled source or prepared resources: `tools/check_public_tree.py` rejects them, and tracked Java is allowed only under the project's own `dev/horizonlab` namespace.
 
 ## Project status
 
-**Player-visible gaps: 0 open** of the 833 the [port ledger](tools/port_ledger.py) found, reading every vanilla 26.3 method against Horizon's code: vanilla behaviour a player would notice that Horizon doesn't have yet. By area: Animals [0](https://github.com/horizon-rust/horizon/issues/3512); Monsters and bosses [0](https://github.com/horizon-rust/horizon/issues/3513); Entities, projectiles, vehicles and decorations [0](https://github.com/horizon-rust/horizon/issues/3514); Items, enchantments and inventories [0](https://github.com/horizon-rust/horizon/issues/3515); Blocks, redstone and fluids [0](https://github.com/horizon-rust/horizon/issues/3516); World, world generation and saves [0](https://github.com/horizon-rust/horizon/issues/3517); Screens, HUD and client packets [0](https://github.com/horizon-rust/horizon/issues/3518); Entity and block rendering, models [0](https://github.com/horizon-rust/horizon/issues/3519); Server and players on the server [0](https://github.com/horizon-rust/horizon/issues/3520); Mob AI, villagers and raids [0](https://github.com/horizon-rust/horizon/issues/3521). This number goes down as gaps close (`tools/parity_gaps.py`); the harness results below say that what is tested matches.
-
-The table is the project's own audit: every subsystem matches vanilla in every harness that compares it. 100% means 100% of what the harnesses compare, not that nothing else differs.
+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 are listed below.
 
 ### Java parity: 100%
 
-Scores: 0 (absent), 0.25 (started), 0.5 (playable, major features missing), 0.75 (mostly complete) or 1 (complete and verified by differential tests); the percentage is their average. Last audited 2026-10-13: the harnesses pass on Linux and macOS. The [port ledger](tools/port_ledger.py) adds a method-by-method view of what is ported.
+Each subsystem scores 0 (absent), 0.25 (started, not playable), 0.5 (playable,
+major vanilla features missing), 0.75 (playable, mostly complete) or 1 (complete
+and verified against vanilla by differential tests). The percentage is the
+average; `tests/test_parity.py` keeps it in sync with this table. Last audited
+2026-10-13 against the harness results: all 281 harnesses pass on Linux, each
+rerun whenever one of its inputs changed, and the Mac mini now runs every one of
+them too (Rust uses Java's own float maths on each platform).
 
 | Subsystem | Score | Main gaps |
 | --- | ---: | --- |
-| Window, input and game loop | 1 | None: game loop, options, camera, auto-jump, toggle sprint/sneak and frame limiter match |
-| Assets and resources | 1 | None: item models match over 196,290 stacks; the resource pack screen over 3,000 sessions |
-| Network protocol and multiplayer | 1 | None: joins vanilla servers; the dedicated server matches vanilla's files, login, configuration, play and command tree; LAN discovery over 462 cases (offline mode only) |
+| Window, input and game loop | 1 | None: the game loop, options, camera, auto-jump, toggle sprint/sneak, local input and the frame limiter match vanilla |
+| Assets and resources | 1 | None: item models match vanilla over 196,290 stacks and the client draws every item through them; the resource pack screen matches vanilla's drawing over 3,000 sessions of clicks, scrolling and searching, its incompatibility confirmation included |
+| Network protocol and multiplayer | 1 | None: joins vanilla servers; the dedicated server (`--dedicated`) matches vanilla's files, status ping, login, configuration, play, chunks, chat, recipes, advancements and command tree, a client built from vanilla's packet code joins it, Horizon joins a vanilla server, and LAN discovery matches over 462 cases (offline mode only) |
 | Chunk storage and palettes | 1 | None: client and saves share paletted containers, identical to vanilla over 266 scenarios |
 | Section meshing | 1 | None: 112 scenes and over a million quads identical to vanilla |
-| Rendering | 1 | None: entity models, block entity renderers (407 cases) and animations (296), HUD overlays (2,200 states), the recipe book (600), player list, subtitles and world border match |
+| Rendering | 1 | None: entity models, block entity renderers (407 cases, End portals, gateways and the loom's banner preview included) and their animations (296 cases, End gateway beams included), the HUD overlays (2,200 states), the recipe book (600 states), the player list, subtitles and the world border match vanilla |
 | Lighting | 1 | None: saved and relit light matches vanilla, slabs and stairs included |
 | World generation | 1 | None: 2,352 whole chunks over 225 structure sites, in all three dimensions, identical to vanilla |
-| Region files and saves | 1 | None: saves round-trip with vanilla; worlds from 1.8 to 26.2 upgrade as vanilla's DataFixers do |
-| Entities and physics | 1 | None: attributes, spawn rules, natural spawning (15,500 cases), raids and patrols (1,900), `finalizeSpawn` (24,000) and mob AI (92 scenarios) match |
-| Interaction and inventory | 1 | None: menu clicks over 8,000 sequences; recipe book placement (6,000), buttons (1,200), saved book (1,500), loom and crafter screens (1,600) |
-| Menus, HUD and chat | 1 | None: every command (758 over 39,685 inputs), scoreboards (81,000 operations), the player list (872,000 draw calls), chat and its suggestions (3,000 sessions) match |
+| Region files and saves | 1 | None: saves round-trip with vanilla, and worlds from 1.8 to 26.2 upgrade as vanilla's DataFixers do, superflat worlds included; old options.txt and hotbar.nbt files are upgraded too |
+| Entities and physics | 1 | None: attributes, dimensions, death loot, spawn rules, natural spawning (15,500 cases), raids and patrols (1,900 cases), spawned mobs' gear, enchantments and state (`finalizeSpawn`, 24,000 cases) and mob AI (92 scenarios: villager breeding and gossip, the warden, ghastlings and copper golems included) match vanilla |
+| Interaction and inventory | 1 | None: menu clicks match over 8,000 click sequences, the loom and the crafter included; recipe book placement (6,000 cases), its buttons (1,200), the saved book (1,500) and the loom and crafter screens (1,600) match vanilla |
+| Menus, HUD and chat | 1 | None: every command runs as vanilla (758 commands over 39,685 parsed inputs), scoreboards and teams match (81,000 operations), the player list matches over 872,000 draw calls with heads drawn from players' skins (authlib's textures, SkinManager's lookup, legacy skin conversion), and the chat matches focused and scrolled; the resource pack screen (selection over 4,000 cases, drawing and its incompatibility confirmation over 3,000 sessions) and the chat input with its command suggestions, usage lines, Tab completion and history (3,000 sessions on vanilla's client command tree) match vanilla |
 | Audio | 1 | None: the sound engine, sound events, music, situational music, ambience and subtitles match vanilla |
-| Block behaviours and ticking | 1 | None: block updates, random ticks, redstone, dispensers (6,000 cases), crafters (4,000), container spills (4,000), copper golems and the sculk family (435 scenarios) match |
+| 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 |
 
 ### Known issues
 
-Skins served over https show the default skin unless already cached; pack icons show the unknown-pack texture in game; item tooltips lack attribute lines.
+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.
 
 ## Licence
 
-[MIT](LICENSE), for the project's original work; dependencies keep their own licences ([notices](THIRD_PARTY_NOTICES.md)). Minecraft is a trademark of Mojang Synergies AB; its code and assets belong to Mojang and Microsoft under the [Minecraft EULA](https://www.minecraft.net/en-us/eula).
+[MIT](LICENSE), for the project's original work only. Dependencies keep their own licences. Minecraft is a trademark of Mojang Synergies AB; Minecraft code and assets belong to Mojang and Microsoft and are covered by the [Minecraft EULA](https://www.minecraft.net/en-us/eula). Decompiled game source and prepared resources stay on your machine and are never published.
+
+Third-party credits and licenses: [Third-party notices](THIRD_PARTY_NOTICES.md).
 
 ## Author
 

THIRD_PARTY_NOTICES.md

@@ -3,31 +3,10 @@
 ## wgpu-hal
 
 `third_party/wgpu-hal` is [wgpu-hal](https://github.com/gfx-rs/wgpu) 30.0.1 by the gfx-rs
-developers, with upstream fixes applied
-([gfx-rs/wgpu#10124](https://github.com/gfx-rs/wgpu/pull/10124),
-[gfx-rs/wgpu#10714](https://github.com/gfx-rs/wgpu/pull/10714)). It is licensed under MIT or
+developers, with one upstream fix applied
+([gfx-rs/wgpu#10124](https://github.com/gfx-rs/wgpu/pull/10124)). It is licensed under MIT or
 Apache-2.0; both licenses are in that folder (`LICENSE.MIT`, `LICENSE.APACHE`).
 
-## naga
-
-`third_party/naga` is [naga](https://github.com/gfx-rs/wgpu) 30.0.1 by the gfx-rs developers, with
-fixes to its GLSL frontend that shader packs need, each applied in the commit that needed it. It is licensed under MIT or Apache-2.0; both licenses
-are in that folder (`LICENSE.MIT`, `LICENSE.APACHE`).
-
-The GLSL frontend also resets the common type for each comma-separated declarator so one
-variable's array specifier does not change later variables.
-It also reads a struct member outside a constant expression through a pointer to the member,
-not out of a loaded copy of the whole struct, so a member an atomic function uses can be read.
-
-## libmimalloc-sys and mimalloc
-
-`third_party/libmimalloc-sys` is [libmimalloc-sys](https://github.com/purpleprotocol/mimalloc_rust)
-0.1.49 by Octavian Oncescu, with the [mimalloc](https://github.com/microsoft/mimalloc) v3 sources it
-bundles (Copyright (c) 2018-2025 Microsoft Corporation, Daan Leijen), both under the MIT license
-(`LICENSE.txt` and `c_src/mimalloc/v3/LICENSE` in that folder). It holds only the v3 sources. One
-change: `mi_popcount` in `include/mimalloc/bits.h` uses mimalloc's portable bit count on MSVC
-x86/x64 instead of the POPCNT instruction, which CPUs before Nehalem lack (#7264).
-
 ## Pixelify Sans
 
 `crates/horizon-theme/fonts/PixelifySans-*.ttf` is [Pixelify Sans](https://github.com/eifetx/Pixelify-Sans)
@@ -40,133 +19,3 @@ by The Pixelify Sans Project Authors, licensed under the SIL Open Font License 1
 [Pixelarticons](https://github.com/halfmage/pixelarticons) by Gerrit Halfmann, under the MIT
 license (`crates/horizon-theme/icons/pixel/LICENSE-pixelarticons.txt`). `star.svg` is Horizon's own, drawn on
 the same grid.
-
-## Hugeicons
-
-`crates/horizon-theme/icons/glass/*.svg` are icons from the free set of
-[Hugeicons](https://github.com/hugeicons/hugeicons) (`@hugeicons/core-free-icons` 4.4.0), under
-the MIT license (`crates/horizon-theme/icons/glass/LICENSE-hugeicons.txt`), exported with a 1.6
-stroke in `currentColor`.
-
-`crates/horizon-theme/icons/glass/discord.svg` is Discord's logo as drawn by
-[Simple Icons](https://github.com/simple-icons/simple-icons) 13.21.0 (CC0 1.0). The logo is Discord's
-trademark, used only on the button that opens Horizon's Discord server.
-
-## AMD FidelityFX SDK (FSR 3.1 frame generation)
-
-`crates/horizon-client-render/src/gfx/frame_gen/optical_flow.wgsl` and `interpolation.wgsl` are
-ports to WGSL of the optical flow and frame interpolation shaders of the
-[AMD FidelityFX SDK](https://github.com/GPUOpen-LibrariesAndSDKs/FidelityFX-SDK) 1.1.4
-(`sdk/include/FidelityFX/gpu/{opticalflow,frameinterpolation}`, at commit
-[c6efa6bf7f20](https://github.com/GPUOpen-LibrariesAndSDKs/FidelityFX-SDK/tree/c6efa6bf7f2027b3ec94f28578bb5965eabb9e55)),
-and `optical_flow.rs` follows the SDK's `sdk/src/components/opticalflow/ffx_opticalflow.cpp`
-(its passes, their order and their dispatch sizes). Copyright (C) 2024 Advanced Micro Devices,
-Inc., under the MIT license, whose text heads each file. AMD and FidelityFX are AMD's
-trademarks; Horizon is not affiliated with AMD.
-
-## Mod loader logos
-
-The launcher shows the logo of the mod loader an instance plays with, and offers the logos as
-instance icons.
-
-- `launcher/assets/logos/{fabric,quilt,neoforge,forge}.png` are the loaders' logos as the launcher
-  mockup on [playhorizon.dev/launcher](https://playhorizon.dev/launcher) shows them (horizon-site
-  `public/media/launcher/*.webp`, converted to PNG), each its project's own mark:
-  [Fabric](https://fabricmc.net/), [Quilt](https://quiltmc.org/) (its art is
-  [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/)),
-  [NeoForged](https://neoforged.net/) (its art, by Ridanisaurus, is
-  [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)) and
-  [Minecraft Forge](https://minecraftforge.net/). They name the loader an instance runs.
-
-Each logo belongs to its project. Showing it says which loader an instance runs; it does not mean
-the project endorses Horizon.
-
-## Sign in with Microsoft
-
-The launcher's sign-in buttons follow Microsoft's published branding guidelines for apps that sign in
-with Microsoft accounts
-([Sign in with Microsoft branding](https://learn.microsoft.com/en-us/entra/identity-platform/howto-add-branding-in-apps)).
-The four-square Microsoft symbol in `launcher/src/microsoft.rs` reproduces the squares, positions and
-colours of Microsoft's official `ms-symbollockup_mssymbol_19.svg` from that page, unmodified. Microsoft
-and its logo are trademarks of the Microsoft group of companies; Horizon is not endorsed by Microsoft.
-
-## CIT Resewn
-
-`crates/horizon-optifine/src/cit.rs` and `crates/horizon-client-render/src/cit.rs` follow the
-condition semantics of [CIT Resewn Continuation](https://github.com/EthanVisagie/CIT-Resewn-Continuation-1.21.11)
-(at `b792f9a`), a continuation of [CIT Resewn](https://github.com/SHsuperCM/CITResewn) by SHsuperCM: the
-1.21 component paths, enchantment levels, percent damage, text matching and rule ordering. It is
-licensed under the MIT license:
-
-> Copyright (c) 2021 SHsuperCM
->
-> Permission is hereby granted, free of charge, to any person obtaining a copy of this software
-> and associated documentation files (the "Software"), to deal in the Software without
-> restriction, including without limitation the rights to use, copy, modify, merge, publish,
-> distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
-> Software is furnished to do so, subject to the following conditions:
->
-> The above copyright notice and this permission notice shall be included in all copies or
-> substantial portions of the Software.
->
-> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
-> BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-> DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-## FusionExamples
-
-The tile tables in `crates/horizon-optifine/src/fusion/layout.rs` were read off the connecting
-texture templates (`templates/template <layout>.png`) of
-[FusionExamples](https://github.com/SuperMartijn642/FusionExamples) (at `8c9c56e`), which is
-licensed under the MIT license:
-
-> Copyright (c) 2024 Martijn van den Brand
->
-> Permission is hereby granted, free of charge, to any person obtaining a copy of this software
-> and associated documentation files (the "Software"), to deal in the Software without
-> restriction, including without limitation the rights to use, copy, modify, merge, publish,
-> distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
-> Software is furnished to do so, subject to the following conditions:
->
-> The above copyright notice and this permission notice shall be included in all copies or
-> substantial portions of the Software.
->
-> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
-> BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-> NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
-> DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-## BlueMap
-
-`crates/horizon-client-render/src/bluemap.rs` reads the lowres tiles of a server's
-[BlueMap](https://github.com/BlueMap-Minecraft/BlueMap) web map. It follows three of BlueMap's files:
-`core/src/main/java/de/bluecolored/bluemap/core/map/lowres/LowresLayer.java` (`saveTile`) for the
-tiles' pixel layout, `common/webapp/src/js/util/Utils.js` (`pathFromCoords`) for their paths, and
-`core/src/main/java/de/bluecolored/bluemap/core/map/MapSettingsSerializer.java` for a map's
-`settings.json`, at commit
-[96ae320d1d39](https://github.com/BlueMap-Minecraft/BlueMap/tree/96ae320d1d39581c10058d8222f2290f2fcb5333).
-BlueMap is licensed under the MIT license:
-
-> Copyright (c) Blue (Lukas Rieger) <https://bluecolored.de>
-> Copyright (c) contributors
->
-> Permission is hereby granted, free of charge, to any person obtaining a copy
-> of this software and associated documentation files (the "Software"), to deal
-> in the Software without restriction, including without limitation the rights
-> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-> copies of the Software, and to permit persons to whom the Software is
-> furnished to do so, subject to the following conditions:
->
-> The above copyright notice and this permission notice shall be included in
-> all copies or substantial portions of the Software.
->
-> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-> THE SOFTWARE.

benchmarks/particle-culling/2026-11-02/README.md

@@ -1,27 +0,0 @@
-# Particle culling review measurements — 2026-11-02
-
-Ordinary-scene captures and measurements for PR #7054. The scene contains 24 mobs, about 9,400–10,100 rain particles, and about 50–100 campfire smoke particles. Two opposite-order passes were run with 2 s warmup and 8 s measurement per condition. Host: Intel Core i7-3770S, Intel HD Graphics 4000, Vulkan/Mesa, 675×727, render distance 4, VSync off, 260 FPS cap.
-
-These are means of the two samples. CPU is the harness's average CPU time per frame; p99 is frame time. The normal scene is not expected to show large gains because most particles are visible.
-
-| Condition | FPS | CPU ms/frame | Frame p99 ms |
-| --- | ---: | ---: | ---: |
-| Main, culling Off | 88.39 | 1.930 | 23.85 |
-| Particle branch, culling Off | 88.55 | 1.828 | 24.88 |
-| Main, Entity Culling Synchronous | 89.12 | 1.887 | 23.07 |
-| Particle branch, Entity Culling Synchronous, Particle Culling Off | 89.06 | 1.897 | 25.18 |
-| Particle Culling Synchronous | 88.87 | 1.774 | 24.94 |
-| Particle Culling Asynchronous* | 89.00 | 1.754 | 24.90 |
-
-*The asynchronous samples predate the final switch to a dedicated particle worker. They are retained only as historical context and are not a measurement of the final worker implementation. No FPS improvement is claimed from these ordinary-scene runs. The Off path delegates directly to `render`; `disabled_culled_render_matches_the_regular_particle_path` checks that it produces the same vertices.
-
-The FPS and CPU differences are within run-to-run variability for this GPU-limited scene. The first four conditions are the reviewer's requested Main-versus-branch default and existing synchronous-mode comparisons. Particle Sync/Async rows are branch-internal mode comparisons.
-
-## Captures
-
-The screenshots show the same ordinary test world and FPS overlay:
-
-- `main-off.png`
-- `particle-off.png`
-- `particle-sync.png`
-- `particle-async.png`

benchmarks/perf/horizon-desktop-rd12.json

@@ -1,870 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
- "created": "2026-11-04T13:00:15Z",
- "app": {
-  "name": "horizon-client",
-  "version": "nightly-2026-11-04-67dad0d",
-  "commit": "67dad0d"
- },
- "hardware": {
-  "os": "linux",
-  "arch": "x86_64",
-  "cpu_threads": 24,
-  "os_version": "NixOS 26.05 (Yarara) (kernel 6.18.57)",
-  "cpu": "13th Gen Intel(R) Core(TM) i7-13700KF",
-  "ram_mb": 31904,
-  "gpu": {
-   "name": "NVIDIA GeForce RTX 4080",
-   "vendor": "nvidia",
-   "driver": "NVIDIA 595.71.05",
-   "backend": "vulkan",
-   "kind": "discrete"
-  }
- },
- "conditions": {
-  "scenario": "perf_bench:village,forest,ocean,mountain",
-  "seed": "1234",
-  "render_distance": 12,
-  "simulation_distance": 12,
-  "vsync": false,
-  "offscreen": false,
-  "repeats": 3,
-  "warmup_s": 2.0,
-  "load_avg_1m": 28.408,
-  "window": [
-   1280,
-   720
-  ]
- },
- "metrics": {
-  "startup.title_ms": {
-   "n": 3,
-   "mean": 66658.183,
-   "stdev": 61839.502,
-   "min": 1827.42,
-   "max": 124993.694,
-   "ci95": 153630.237
-  },
-  "startup.world_ms": {
-   "n": 3,
-   "mean": 74754.411,
-   "stdev": 59189.587,
-   "min": 13600.651,
-   "max": 131761.773,
-   "ci95": 147046.952
-  },
-  "chunks.village.load_ms": {
-   "n": 3,
-   "mean": 5571.499,
-   "stdev": 1900.32,
-   "min": 3378.38,
-   "max": 6730.394,
-   "ci95": 4721.037
-  },
-  "chunks.village.meshed_count": {
-   "n": 3,
-   "mean": 15287.0,
-   "stdev": 527.501,
-   "min": 14788.0,
-   "max": 15839.0,
-   "ci95": 1310.49
-  },
-  "fps.village.avg_fps": {
-   "n": 3,
-   "mean": 2958.557,
-   "stdev": 376.543,
-   "min": 2526.453,
-   "max": 3216.434,
-   "ci95": 935.46
-  },
-  "fps.village.low_1pct_fps": {
-   "n": 3,
-   "mean": 368.457,
-   "stdev": 90.668,
-   "min": 300.631,
-   "max": 471.438,
-   "ci95": 225.25
-  },
-  "fps.village.low_01pct_fps": {
-   "n": 3,
-   "mean": 91.04,
-   "stdev": 40.506,
-   "min": 46.124,
-   "max": 124.796,
-   "ci95": 100.63
-  },
-  "memory.village.gpu_mb": {
-   "n": 3,
-   "mean": 581.0,
-   "stdev": 48.0,
-   "min": 533.0,
-   "max": 629.0,
-   "ci95": 119.248
-  },
-  "memory.village.rss_mb": {
-   "n": 3,
-   "mean": 1277.531,
-   "stdev": 25.546,
-   "min": 1253.879,
-   "max": 1304.623,
-   "ci95": 63.466
-  },
-  "tick.village.client_ms": {
-   "n": 3,
-   "mean": 0.529,
-   "stdev": 0.127,
-   "min": 0.396,
-   "max": 0.649,
-   "ci95": 0.315
-  },
-  "cpu.village.p50_ms": {
-   "n": 3,
-   "mean": 0.185,
-   "stdev": 0.034,
-   "min": 0.162,
-   "max": 0.224,
-   "ci95": 0.085
-  },
-  "chunks.forest.load_ms": {
-   "n": 3,
-   "mean": 3318.3,
-   "stdev": 911.608,
-   "min": 2266.627,
-   "max": 3883.075,
-   "ci95": 2264.743
-  },
-  "chunks.forest.meshed_count": {
-   "n": 3,
-   "mean": 16565.333,
-   "stdev": 172.755,
-   "min": 16367.0,
-   "max": 16683.0,
-   "ci95": 429.182
-  },
-  "fps.forest.avg_fps": {
-   "n": 3,
-   "mean": 2333.626,
-   "stdev": 569.124,
-   "min": 1745.365,
-   "max": 2881.457,
-   "ci95": 1413.897
-  },
-  "fps.forest.low_1pct_fps": {
-   "n": 3,
-   "mean": 336.615,
-   "stdev": 185.666,
-   "min": 208.133,
-   "max": 549.487,
-   "ci95": 461.257
-  },
-  "fps.forest.low_01pct_fps": {
-   "n": 3,
-   "mean": 160.734,
-   "stdev": 127.586,
-   "min": 39.777,
-   "max": 294.05,
-   "ci95": 316.967
-  },
-  "memory.forest.gpu_mb": {
-   "n": 3,
-   "mean": 666.333,
-   "stdev": 24.44,
-   "min": 645.0,
-   "max": 693.0,
-   "ci95": 60.718
-  },
-  "memory.forest.rss_mb": {
-   "n": 3,
-   "mean": 1346.816,
-   "stdev": 42.279,
-   "min": 1305.547,
-   "max": 1390.037,
-   "ci95": 105.035
-  },
-  "tick.forest.client_ms": {
-   "n": 3,
-   "mean": 0.669,
-   "stdev": 0.084,
-   "min": 0.598,
-   "max": 0.761,
-   "ci95": 0.208
-  },
-  "cpu.forest.p50_ms": {
-   "n": 3,
-   "mean": 0.222,
-   "stdev": 0.032,
-   "min": 0.197,
-   "max": 0.258,
-   "ci95": 0.079
-  },
-  "chunks.ocean.load_ms": {
-   "n": 3,
-   "mean": 2463.434,
-   "stdev": 1056.0,
-   "min": 1527.516,
-   "max": 3608.283,
-   "ci95": 2623.462
-  },
-  "chunks.ocean.meshed_count": {
-   "n": 3,
-   "mean": 14226.667,
-   "stdev": 307.077,
-   "min": 14038.0,
-   "max": 14581.0,
-   "ci95": 762.883
-  },
-  "fps.ocean.avg_fps": {
-   "n": 3,
-   "mean": 2192.874,
-   "stdev": 1320.904,
-   "min": 673.829,
-   "max": 3071.415,
-   "ci95": 3281.573
-  },
-  "fps.ocean.low_1pct_fps": {
-   "n": 3,
-   "mean": 345.406,
-   "stdev": 294.904,
-   "min": 8.977,
-   "max": 559.232,
-   "ci95": 732.642
-  },
-  "fps.ocean.low_01pct_fps": {
-   "n": 3,
-   "mean": 172.573,
-   "stdev": 149.386,
-   "min": 1.038,
-   "max": 274.089,
-   "ci95": 371.125
-  },
-  "memory.ocean.gpu_mb": {
-   "n": 3,
-   "mean": 629.0,
-   "stdev": 32.0,
-   "min": 597.0,
-   "max": 661.0,
-   "ci95": 79.499
-  },
-  "memory.ocean.rss_mb": {
-   "n": 3,
-   "mean": 1352.223,
-   "stdev": 51.951,
-   "min": 1301.492,
-   "max": 1405.314,
-   "ci95": 129.065
-  },
-  "tick.ocean.client_ms": {
-   "n": 3,
-   "mean": 0.512,
-   "stdev": 0.099,
-   "min": 0.406,
-   "max": 0.603,
-   "ci95": 0.246
-  },
-  "cpu.ocean.p50_ms": {
-   "n": 3,
-   "mean": 0.178,
-   "stdev": 0.038,
-   "min": 0.135,
-   "max": 0.206,
-   "ci95": 0.094
-  },
-  "chunks.mountain.load_ms": {
-   "n": 3,
-   "mean": 6260.675,
-   "stdev": 3077.348,
-   "min": 2976.342,
-   "max": 9077.55,
-   "ci95": 7645.173
-  },
-  "chunks.mountain.meshed_count": {
-   "n": 3,
-   "mean": 16015.333,
-   "stdev": 209.872,
-   "min": 15826.0,
-   "max": 16241.0,
-   "ci95": 521.393
-  },
-  "fps.mountain.avg_fps": {
-   "n": 3,
-   "mean": 1412.095,
-   "stdev": 962.145,
-   "min": 714.773,
-   "max": 2509.775,
-   "ci95": 2390.293
-  },
-  "fps.mountain.low_1pct_fps": {
-   "n": 3,
-   "mean": 182.479,
-   "stdev": 177.563,
-   "min": 13.364,
-   "max": 367.429,
-   "ci95": 441.126
-  },
-  "fps.mountain.low_01pct_fps": {
-   "n": 3,
-   "mean": 88.451,
-   "stdev": 87.578,
-   "min": 1.526,
-   "max": 176.667,
-   "ci95": 217.572
-  },
-  "memory.mountain.gpu_mb": {
-   "n": 3,
-   "mean": 799.667,
-   "stdev": 18.475,
-   "min": 789.0,
-   "max": 821.0,
-   "ci95": 45.899
-  },
-  "memory.mountain.rss_mb": {
-   "n": 3,
-   "mean": 1491.572,
-   "stdev": 36.719,
-   "min": 1459.775,
-   "max": 1531.76,
-   "ci95": 91.221
-  },
-  "tick.mountain.client_ms": {
-   "n": 3,
-   "mean": 0.697,
-   "stdev": 0.155,
-   "min": 0.602,
-   "max": 0.876,
-   "ci95": 0.386
-  },
-  "cpu.mountain.p50_ms": {
-   "n": 3,
-   "mean": 0.325,
-   "stdev": 0.115,
-   "min": 0.239,
-   "max": 0.456,
-   "ci95": 0.286
-  },
-  "memory.rss_peak_mb": {
-   "n": 3,
-   "mean": 1545.896,
-   "stdev": 30.591,
-   "min": 1524.965,
-   "max": 1581.004,
-   "ci95": 75.999
-  },
-  "memory.rss_steady_mb": {
-   "n": 3,
-   "mean": 1348.389,
-   "stdev": 52.5,
-   "min": 1296.172,
-   "max": 1401.168,
-   "ci95": 130.428
-  }
- },
- "frames": [
-  {
-   "phase": "village",
-   "repeat": 0,
-   "frames": 37594,
-   "seconds": 12.0,
-   "avg_fps": 3132.783,
-   "low_1pct_fps": 471.438,
-   "low_01pct_fps": 124.796,
-   "p50_ms": 0.271,
-   "p95_ms": 0.494,
-   "p99_ms": 1.127,
-   "p999_ms": 2.15,
-   "max_ms": 155.204,
-   "cpu_p50_ms": 0.168,
-   "gpu_p50_ms": 0.104,
-   "histogram": [
-    37151,
-    394,
-    30,
-    8,
-    5,
-    2,
-    2,
-    0,
-    0,
-    0,
-    0,
-    0,
-    0,
-    0,
-    1,
-    0,
-    0,
-    0,
-    0,
-    0,
-    1,
-    0,
-    0,
-    0
-   ]
-  },
-  {
-   "phase": "village",
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benchmarks/perf/horizon-desktop-rd32.json

@@ -1,870 +0,0 @@
-{
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- "version": 1,
- "kind": "game",
- "created": "2026-11-04T14:47:19Z",
- "app": {
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-  "commit": "67dad0d"
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-   "backend": "vulkan",
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-  }
- },
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benchmarks/perf/horizon-m4pro-1080p-rd16.json

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-{
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- "version": 1,
- "kind": "game",
- "created": "2026-11-01T22:55:52Z",
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-  "gpu": {
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-   "vendor": "",
-   "driver": "",
-   "backend": "metal",
-   "kind": "integrated"
-  }
- },
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-  "seed": "1234",
-  "render_distance": 16,
-  "simulation_distance": 12,
-  "vsync": false,
-  "offscreen": true,
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-  "load_avg_1m": 113.978,
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benchmarks/perf/horizon-m4pro-1080p-rd32.json

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-{
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- "created": "2026-11-01T23:17:23Z",
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-  "gpu": {
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-   "vendor": "",
-   "driver": "",
-   "backend": "metal",
-   "kind": "integrated"
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benchmarks/perf/horizon-m4pro-1080p-rd8.json

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-{
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-  "gpu": {
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-   "vendor": "",
-   "driver": "",
-   "backend": "metal",
-   "kind": "integrated"
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benchmarks/perf/horizon-macmini-rd12.json

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-{
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-  "ram_mb": 65536,
-  "gpu": {
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-   "vendor": "",
-   "driver": "",
-   "backend": "metal",
-   "kind": "integrated"
-  }
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benchmarks/perf/horizon-macmini-rd32.json

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-{
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-  "ram_mb": 65536,
-  "gpu": {
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-   "vendor": "",
-   "driver": "",
-   "backend": "metal",
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benchmarks/perf/horizon-win-9800x3d-5080-rd16.json

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-{
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- "kind": "game",
- "created": "2026-10-29T01:13:01Z",
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-   "driver": "NVIDIA 617.42",
-   "backend": "vulkan",
-   "kind": "discrete"
-  }
- },
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-  "vsync": false,
-  "offscreen": false,
-  "repeats": 3,
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benchmarks/perf/horizon-win-9800x3d-5080-rd32.json

@@ -1,773 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
- "created": "2026-10-29T18:55:59Z",
- "app": {
-  "name": "horizon-client",
-  "version": "v0.2.97",
-  "commit": null
- },
- "hardware": {
-  "os": "windows",
-  "arch": "x86_64",
-  "cpu_threads": 16,
-  "os_version": "Microsoft Windows [Version 10.0.26200.8037]",
-  "cpu": "AMD Ryzen 7 9800X3D 8-Core Processor",
-  "ram_mb": 95943,
-  "gpu": {
-   "name": "NVIDIA GeForce RTX 5080",
-   "vendor": "nvidia",
-   "driver": "NVIDIA 617.42",
-   "backend": "vulkan",
-   "kind": "discrete"
-  }
- },
- "conditions": {
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-  "seed": "1234",
-  "render_distance": 32,
-  "simulation_distance": 12,
-  "vsync": false,
-  "offscreen": false,
-  "repeats": 3,
-  "warmup_s": 2.0,
-  "window": [
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- },
- "metrics": {
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benchmarks/perf/horizon-win-9800x3d-5080-rd8.json

@@ -1,773 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
- "created": "2026-10-29T18:37:03Z",
- "app": {
-  "name": "horizon-client",
-  "version": "v0.2.97",
-  "commit": null
- },
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benchmarks/perf/macmini-m4pro-loaded-2026-11-01.md

@@ -1,68 +0,0 @@
-# Horizon main vs vanilla 26.3 on a loaded Mac mini M4 Pro (2026-11-01)
-
-`tools/perf_bench.py` reports for Horizon main 1bd24e4042, vanilla 26.3 and vanilla with performance mods, render distances
-8, 16 and 32, three games each, every game from a fresh world. **These are not player numbers:** the Mac mini was running other
-work the whole time (1-minute load average 15-114 on 14 cores), and every game rendered without presenting. They are kept because
-they're the first Mac reports and show how each game behaves under heavy CPU contention. The reports are the
-`*-m4pro-1080p-rd*.json` files next to this page.
-
-## Setup
-
-- **Machine:** Mac mini, Apple M4 Pro (10 performance + 4 efficiency cores, 20-core GPU), 64 GB, macOS 27.0.1. Screen
-  1920x1080; the session was locked, so every game ran `offscreen` (Horizon renders into a texture; vanilla draws into a
-  window nobody sees).
-- **Horizon:** main 1bd24e4042, `cargo build --release -p horizon-client`, Metal.
-- **Vanilla:** the 26.3 client jar with Fabric Loader and the driver mod, Java 25 (Temurin), `-Xmx2G` with the launcher's G1
-  flags, OpenGL 4.1 (Apple's Metal-backed driver).
-- **Vanilla + mods:** the same with Sodium mc26.3-0.9.2, Lithium mc26.3-0.26.2, FerriteCore 9.0.0, ImmediatelyFast 1.17.1 and
-  Fabric API (`tools/benchmark-deps/mods.lock.json`).
-- **Order:** the games took turns inside each repeat (vanilla, mods, Horizon; then mods, Horizon, vanilla; then Horizon, vanilla,
-  mods), one game at a time.
-
-## Why these numbers aren't a fair comparison
-
-- **Load.** Load before each game: RD 8 46-82, RD 16 43-114, RD 32 15-59 (the later RD 32 games ran at 15-30). Horizon raises its
-  render and server threads to the user-interactive QoS class, and the JVM's threads stay at the default, so under this
-  contention macOS runs Horizon's frame first. Vanilla's 1% lows of 2-15 FPS show that, more than how fast either game is.
-- **Resolution.** Vanilla's 1920x1080 window was shrunk to **1920x930** by the 1080p screen (menu and title bars); Horizon,
-  offscreen, rendered 1920x1080. Vanilla drew 14% fewer pixels, which favours it in GPU-bound scenes. Because the recorded
-  windows differ, `perf_bench.py --table` refuses to compare these reports. The tables below were made with the window check
-  skipped. A rerun at a size that fits the screen (1600x900) would avoid it.
-
-## Results
-
-Mean of 3 games ± 95% confidence interval. FPS over the 12-second flight (average / 1% low / 0.1% low):
-
-| RD | scene | Horizon main | Vanilla 26.3 | Vanilla + mods |
-| --- | --- | --- | --- | --- |
-| 8 | forest | 364 ±22 / 145 ±54 / 97 ±38 | 66 ±22 / 8 ±10 / 6 ±8 | 47 ±42 / 4 ±2 / 3 ±1 |
-| 8 | mountain | 466 ±7 / 165 ±54 / 91 ±37 | 46 ±37 / 5 ±7 / 4 ±6 | 67 ±35 / 8 ±5 / 4 ±4 |
-| 8 | ocean | 410 ±88 / 161 ±39 / 112 ±41 | 50 ±44 / 6 ±13 / 5 ±11 | 35 ±16 / 5 ±4 / 4 ±4 |
-| 8 | village | 540 ±453 / 196 ±189 / 135 ±184 | 42 ±16 / 4 ±3 / 3 ±0 | 33 ±46 / 4 ±6 / 3 ±4 |
-| 16 | forest | 333 ±4 / 193 ±29 / 137 ±71 | 23 ±9 / 2 ±1 / 2 ±1 | 62 ±94 / 10 ±21 / 7 ±14 |
-| 16 | mountain | 357 ±6 / 200 ±30 / 154 ±33 | 44 ±12 / 7 ±2 / 4 ±1 | 36 ±44 / 4 ±5 / 3 ±5 |
-| 16 | ocean | 412 ±4 / 209 ±26 / 127 ±44 | 51 ±16 / 6 ±8 / 4 ±7 | 75 ±159 / 13 ±33 / 7 ±16 |
-| 16 | village | 568 ±30 / 271 ±25 / 210 ±75 | 46 ±110 / 9 ±27 / 7 ±17 | 46 ±45 / 7 ±9 / 5 ±4 |
-| 32 | forest | 165 ±11 / 104 ±51 / 95 ±60 | 68 ±122 / 18 ±49 / 14 ±42 | 114 ±132 / 29 ±44 / 21 ±34 |
-| 32 | mountain | 190 ±5 / 109 ±35 / 91 ±32 | 29 ±19 / 3 ±2 / 2 ±3 | 57 ±49 / 7 ±2 / 3 ±3 |
-| 32 | ocean | 210 ±13 / 129 ±77 / 116 ±98 | 44 ±80 / 5 ±4 / 2 ±1 | 119 ±176 / 32 ±66 / 17 ±37 |
-| 32 | village | 326 ±17 / 152 ±85 / 123 ±84 | 81 ±99 / 15 ±20 / 11 ±11 | 92 ±28 / 13 ±6 / 9 ±3 |
-
-Start to title / in-world, mean scene load, RSS steady / peak, physical footprint steady / peak (macOS `footprint`, which on Apple
-Silicon includes the game's GPU allocations), load average before the first game:
-
-| RD | Horizon main | Vanilla 26.3 | Vanilla + mods |
-| --- | --- | --- | --- |
-| 8 | 7.2 / 11.4, 6.5, 1379 / 1537, 1883 / 2094, 73 | 49.9 / 89.1, 18.2, 1811 / 1877, 2635 / 2709, 66 | 56.3 / 97.7, 17.9, 1927 / 2019, 2396 / 2441, 74 |
-| 16 | 1.5 / 14.0, 9.5, 1617 / 1892, 2495 / 3084, 114 | 19.4 / 78.9, 33.3, 2431 / 2555, 3450 / 3713, 76 | 23.8 / 76.9, 27.1, 2355 / 2566, 3212 / 3431, 70 |
-| 32 | 2.2 / 14.3, 11.1, 2196 / 2537, 4373 / 5560, 28 | 20.6 / 124.2, 44.2, 2838 / 2958, 4265 / 4618, 59 | 13.5 / 63.2, 29.9, 3705 / 4078, 4647 / 5250, 37 |
-
-## What it shows
-
-- Horizon is GPU-bound on the M4 Pro in every scene at every distance: its median GPU time per frame is 1.6-2.5 ms at RD 8 and
-  2.9-5.7 ms at RD 32, its render thread's CPU time 0.6-2.2 ms.
-- In the least-loaded RD 32 games (load 15-22), vanilla + mods matched Horizon's average FPS over the forest (162 vs 163-170) and
-  the ocean (187 vs 209-216); Horizon's 1% lows were 2.4 times the modded client's there, and 15-17 times over the village and the
-  mountain.
-- Horizon's resident memory is 1.2-1.7 times smaller than both clients'. Its physical footprint, GPU memory included, is level
-  with vanilla's at RD 32 (4373 vs 4265 MB steady) and above it at peak (5560 vs 4618 MB).

benchmarks/perf/site-2026-11-04.md

@@ -1,42 +0,0 @@
-# Horizon Nightly 2026-11-04 vs vanilla 26.3 on the Mac mini and the desktop (2026-11-04)
-
-> **The Mac mini reports (`*-macmini-rd*.json`) are offscreen, not comparable.** Horizon rendered offscreen (no presenting)
-> while vanilla drew into a window, so the Mac rows below are not a Horizon-vs-vanilla comparison, and the website does not
-> publish them: it keeps the Mac mini's 2026-10-22 runs. They are kept here only as a record of that day's offscreen run.
-
-The desktop runs are the ones behind playhorizon.dev/benchmarks as of 2026-11-04 (horizon-rust/horizon-site#58): `tools/perf_bench.py`
-reports, render distance 12 and 32, three games each, every game from a fresh world (seed 1234), 1280x720, VSync off. Files:
-`{horizon,vanilla}-macmini-rd{12,32}.json` and `{horizon,vanilla}-desktop-rd{12,32}.json` next to this page.
-
-## Builds
-
-- **Horizon:** the Nightly 2026-11-04 release bundle (67dad0d), as the launcher installs it: macOS arm64 on the Mac,
-  Linux x86_64 on the desktop. Its resources come from the bundle's own `horizon-prepare`. perf_bench ran from main
-  a55b9a2e52 and wrote that checkout's crate version and commit; `app.version` and `app.commit` were set to the bundle's by hand.
-- **Vanilla:** the 26.3 client jar with Fabric Loader and the driver mod, Java 25, the official launcher's JVM flags.
-
-## Machines and conditions
-
-- **Mac mini, Apple M4 Pro (14 cores, 20-core GPU), macOS: offscreen, not comparable.** The session was locked, so Horizon ran `--offscreen`: a locked
-  session gives a window no frames, and windowed Horizon measured 0 FPS. Vanilla drew into its window. Offscreen skips
-  presenting, which favours Horizon, so its averages aren't held at the 144 Hz display as they were on 2026-10-22. Each game
-  started at a 1-minute load of 17-18 (the run waited for < 20); during the runs the load rose to 30-50.
-- **Desktop, RTX 4080 + i7-13700KF, NixOS, NVIDIA 595.** Both games drew into a headless sway rendering on the RTX 4080 (never
-  on its screen), both through Wayland on Vulkan. Vanilla went through SDL's Wayland driver: through Xwayland each of its
-  frames took about 2 s on this day. The machine also runs CI and agents' builds: each game started at a load of 28-30 on
-  24 threads (the run waited for < 30) and the load rose to 40-70 during the runs. Vanilla at RD 32 crashed twice under that
-  load (`GPU timeout attempting to acquire next frame`) before a third series finished. Start-up times are inflated by the
-  load and by a cold disk on each series' first start (start → world up to 130-235 s).
-- **Order:** RD 12 ran Horizon then vanilla; RD 32 ran vanilla then Horizon.
-
-## Results (average over the flights of the three games; FPS average / 1% low)
-
-| Machine | RD | Horizon | Vanilla | Horizon ÷ vanilla (avg, 1% low) |
-|---|---|---|---|---|
-| Mac mini (**offscreen, not comparable**) | 12 | 774 / 294 | 132 / 27 | — |
-| Mac mini (**offscreen, not comparable**) | 32 | 297 / 159 | 68 / 16 | — |
-| Desktop | 12 | 2,224 / 308 | 1,824 / 201 | 1.2x, 1.5x |
-| Desktop | 32 | 800 / 140 | 696 / 64 | 1.15x, 2.2x |
-
-Neither machine was idle, so these say how both games behave on busy machines. They are not clean ratios; for those, see
-`windows-9800x3d-5080-2026-10-29.md`. The scripts and logs are in horizon-parity `shots/site-bench-2026-11-04/`.

benchmarks/perf/vanilla-desktop-rd12.json

@@ -1,787 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
- "created": "2026-11-04T13:28:55Z",
- "app": {
-  "name": "minecraft",
-  "version": "26.3",
-  "mods": [
-   {
-    "name": "fabric-loader",
-    "version": "0.19.5"
-   }
-  ]
- },
- "hardware": {
-  "os": "linux",
-  "arch": "x86_64",
-  "cpu_threads": 24,
-  "os_version": "NixOS 26.05 (Yarara) (kernel 6.18.57)",
-  "cpu": "13th Gen Intel(R) Core(TM) i7-13700KF",
-  "ram_mb": 31904,
-  "gpu": {
-   "name": "NVIDIA GeForce RTX 4080",
-   "vendor": "NVIDIA",
-   "driver": "1.4.329 NVIDIA 595.71.05",
-   "backend": "vulkan",
-   "kind": ""
-  }
- },
- "conditions": {
-  "scenario": "perf_bench:village,forest,ocean,mountain",
-  "seed": "1234",
-  "render_distance": 12,
-  "simulation_distance": 12,
-  "vsync": false,
-  "offscreen": false,
-  "repeats": 3,
-  "warmup_s": 2.0,
-  "load_avg_1m": 28.788,
-  "window": [
-   1280,
-   720
-  ]
- },
- "metrics": {
-  "startup.title_ms": {
-   "n": 3,
-   "mean": 121075.467,
-   "stdev": 30646.429,
-   "min": 93272.034,
-   "max": 153935.834,
-   "ci95": 76136.094
-  },
-  "startup.world_ms": {
-   "n": 3,
-   "mean": 191063.8,
-   "stdev": 34368.16,
-   "min": 153895.533,
-   "max": 221692.034,
-   "ci95": 85382.134
-  },
-  "chunks.village.load_ms": {
-   "n": 3,
-   "mean": 18724.322,
-   "stdev": 9639.048,
-   "min": 13107.549,
-   "max": 29854.376,
-   "ci95": 23946.655
-  },
-  "fps.village.avg_fps": {
-   "n": 3,
-   "mean": 2161.532,
-   "stdev": 287.109,
-   "min": 1830.069,
-   "max": 2332.81,
-   "ci95": 713.276
-  },
-  "fps.village.low_1pct_fps": {
-   "n": 3,
-   "mean": 162.575,
-   "stdev": 29.799,
-   "min": 136.023,
-   "max": 194.804,
-   "ci95": 74.03
-  },
-  "fps.village.low_01pct_fps": {
-   "n": 3,
-   "mean": 27.752,
-   "stdev": 3.186,
-   "min": 24.403,
-   "max": 30.746,
-   "ci95": 7.916
-  },
-  "memory.village.gpu_mb": {
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-   "mean": 13.0,
-   "stdev": 0.0,
-   "min": 13.0,
-   "max": 13.0,
-   "ci95": 0.0
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-  "memory.village.rss_mb": {
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-   "stdev": 158.708,
-   "min": 2747.244,
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-   "ci95": 394.285
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-  "tick.village.client_ms": {
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-   "mean": 0.691,
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-   "min": 0.601,
-   "max": 0.794,
-   "ci95": 0.241
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-  "chunks.forest.load_ms": {
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-   "stdev": 530.809,
-   "min": 8350.811,
-   "max": 9408.241,
-   "ci95": 1318.709
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-  "fps.forest.avg_fps": {
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-   "mean": 1841.581,
-   "stdev": 1186.781,
-   "min": 471.209,
-   "max": 2529.847,
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-  "fps.forest.low_1pct_fps": {
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-   "mean": 255.087,
-   "stdev": 217.128,
-   "min": 5.798,
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-  "fps.forest.low_01pct_fps": {
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-   "stdev": 81.722,
-   "min": 0.61,
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benchmarks/perf/vanilla-desktop-rd32.json

@@ -1,787 +0,0 @@
-{
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-   "vendor": "NVIDIA",
-   "driver": "1.4.329 NVIDIA 595.71.05",
-   "backend": "vulkan",
-   "kind": ""
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benchmarks/perf/vanilla-m4pro-1080p-rd16.json

@@ -1,707 +0,0 @@
-{
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benchmarks/perf/vanilla-m4pro-1080p-rd32.json

@@ -1,707 +0,0 @@
-{
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- "version": 1,
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- "created": "2026-11-01T23:17:23Z",
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benchmarks/perf/vanilla-m4pro-1080p-rd8.json

@@ -1,707 +0,0 @@
-{
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- "version": 1,
- "kind": "game",
- "created": "2026-11-01T22:55:52Z",
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-  "cpu": "Apple M4 Pro",
-  "ram_mb": 65536,
-  "gpu": {
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-   "vendor": "Apple",
-   "driver": "4.1 Metal - 91.7",
-   "backend": "opengl",
-   "kind": ""
-  }
- },
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-  "vsync": false,
-  "offscreen": true,
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-  "load_avg_1m": 66.477,
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benchmarks/perf/vanilla-macmini-rd12.json

@@ -1,771 +0,0 @@
-{
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-   "backend": "opengl",
-   "kind": ""
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benchmarks/perf/vanilla-macmini-rd32.json

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-{
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-   "driver": "4.1 Metal - 91.7",
-   "backend": "opengl",
-   "kind": ""
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benchmarks/perf/vanilla-mods-m4pro-1080p-rd16.json

@@ -1,723 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
- "created": "2026-11-01T22:55:52Z",
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-   },
-   {
-    "name": "sodium",
-    "version": "mc26.3-0.9.2-fabric"
-   },
-   {
-    "name": "lithium",
-    "version": "mc26.3-0.26.2-fabric"
-   },
-   {
-    "name": "ferrite-core",
-    "version": "9.0.0-fabric"
-   },
-   {
-    "name": "immediatelyfast",
-    "version": "1.17.1+26.3-fabric"
-   }
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- },
- "hardware": {
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-  "arch": "aarch64",
-  "cpu_threads": 14,
-  "os_version": "27.0.1",
-  "cpu": "Apple M4 Pro",
-  "ram_mb": 65536,
-  "gpu": {
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-   "vendor": "Apple",
-   "driver": "4.1 Metal - 91.7",
-   "backend": "opengl",
-   "kind": ""
-  }
- },
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-  "offscreen": true,
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-}

benchmarks/perf/vanilla-mods-m4pro-1080p-rd32.json

@@ -1,723 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
- "created": "2026-11-01T23:17:23Z",
- "app": {
-  "name": "minecraft",
-  "version": "26.3",
-  "mods": [
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-    "version": "0.19.5"
-   },
-   {
-    "name": "sodium",
-    "version": "mc26.3-0.9.2-fabric"
-   },
-   {
-    "name": "lithium",
-    "version": "mc26.3-0.26.2-fabric"
-   },
-   {
-    "name": "ferrite-core",
-    "version": "9.0.0-fabric"
-   },
-   {
-    "name": "immediatelyfast",
-    "version": "1.17.1+26.3-fabric"
-   }
-  ]
- },
- "hardware": {
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-  "arch": "aarch64",
-  "cpu_threads": 14,
-  "os_version": "27.0.1",
-  "cpu": "Apple M4 Pro",
-  "ram_mb": 65536,
-  "gpu": {
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-   "vendor": "Apple",
-   "driver": "4.1 Metal - 91.7",
-   "backend": "opengl",
-   "kind": ""
-  }
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benchmarks/perf/vanilla-mods-m4pro-1080p-rd8.json

@@ -1,723 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
- "created": "2026-11-01T22:55:52Z",
- "app": {
-  "name": "minecraft",
-  "version": "26.3",
-  "mods": [
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-    "version": "0.19.5"
-   },
-   {
-    "name": "sodium",
-    "version": "mc26.3-0.9.2-fabric"
-   },
-   {
-    "name": "lithium",
-    "version": "mc26.3-0.26.2-fabric"
-   },
-   {
-    "name": "ferrite-core",
-    "version": "9.0.0-fabric"
-   },
-   {
-    "name": "immediatelyfast",
-    "version": "1.17.1+26.3-fabric"
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benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd16.json

@@ -1,706 +0,0 @@
-{
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- "version": 1,
- "kind": "game",
- "created": "2026-10-29T01:25:53Z",
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-   {
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-    "version": "mc26.3-0.9.2-fabric"
-   },
-   {
-    "name": "lithium",
-    "version": "mc26.3-0.26.2-fabric"
-   },
-   {
-    "name": "ferrite-core",
-    "version": "9.0.0-fabric"
-   },
-   {
-    "name": "immediatelyfast",
-    "version": "1.17.1+26.3-fabric"
-   }
-  ]
- },
- "hardware": {
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-  "arch": "x86_64",
-  "cpu_threads": 16,
-  "os_version": "Microsoft Windows [Version 10.0.26200.8037]",
-  "cpu": "AMD Ryzen 7 9800X3D 8-Core Processor",
-  "ram_mb": 95943,
-  "gpu": {
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-   "vendor": "NVIDIA Corporation",
-   "driver": "3.3.0 NVIDIA 617.42",
-   "backend": "opengl",
-   "kind": ""
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-  "window": [
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benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd32.json

@@ -1,706 +0,0 @@
-{
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- "kind": "game",
- "created": "2026-10-29T19:27:56Z",
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-    "version": "mc26.3-0.9.2-fabric"
-   },
-   {
-    "name": "lithium",
-    "version": "mc26.3-0.26.2-fabric"
-   },
-   {
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-    "version": "9.0.0-fabric"
-   },
-   {
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-    "version": "1.17.1+26.3-fabric"
-   }
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- },
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-  "os_version": "Microsoft Windows [Version 10.0.26200.8037]",
-  "cpu": "AMD Ryzen 7 9800X3D 8-Core Processor",
-  "ram_mb": 95943,
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-   "vendor": "NVIDIA Corporation",
-   "driver": "3.3.0 NVIDIA 617.42",
-   "backend": "opengl",
-   "kind": ""
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benchmarks/perf/vanilla-mods-win-9800x3d-5080-rd8.json

@@ -1,706 +0,0 @@
-{
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-   {
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-    "version": "mc26.3-0.26.2-fabric"
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-  "cpu": "AMD Ryzen 7 9800X3D 8-Core Processor",
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-   "driver": "3.3.0 NVIDIA 617.42",
-   "backend": "opengl",
-   "kind": ""
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- "label": "vanilla-mods-win-9800x3d-5080"
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benchmarks/perf/vanilla-win-9800x3d-5080-rd16.json

@@ -1,690 +0,0 @@
-{
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benchmarks/perf/vanilla-win-9800x3d-5080-rd32.json

@@ -1,690 +0,0 @@
-{
- "format": "horizon-benchmark-report",
- "version": 1,
- "kind": "game",
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benchmarks/perf/vanilla-win-9800x3d-5080-rd8.json

@@ -1,690 +0,0 @@
-{
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- "version": 1,
- "kind": "game",
- "created": "2026-10-29T18:43:17Z",
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-  "cpu_threads": 16,
-  "os_version": "Microsoft Windows [Version 10.0.26200.8037]",
-  "cpu": "AMD Ryzen 7 9800X3D 8-Core Processor",
-  "ram_mb": 95943,
-  "gpu": {
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-   "vendor": "NVIDIA Corporation",
-   "driver": "3.3.0 NVIDIA 617.42",
-   "backend": "opengl",
-   "kind": ""
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- },
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-  "simulation_distance": 12,
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-   "phase": "forest",
-   "repeat": 1,
-   "frames": 31763,
-   "seconds": 12.0,
-   "avg_fps": 2646.916,
-   "low_1pct_fps": 685.008,
-   "low_01pct_fps": 270.233,
-   "p50_ms": 0.344,
-   "p95_ms": 0.52,
-   "p99_ms": 0.94,
-   "p999_ms": 1.685,
-   "max_ms": 11.406,
-   "histogram": [
-    31474,
-    272,
-    3,
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-  {
-   "phase": "forest",
-   "repeat": 2,
-   "frames": 24818,
-   "seconds": 12.0,
-   "avg_fps": 2068.162,
-   "low_1pct_fps": 521.303,
-   "low_01pct_fps": 229.228,
-   "p50_ms": 0.439,
-   "p95_ms": 0.767,
-   "p99_ms": 1.284,
-   "p999_ms": 2.351,
-   "max_ms": 11.468,
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-  },
-  {
-   "phase": "ocean",
-   "repeat": 0,
-   "frames": 32039,
-   "seconds": 12.0,
-   "avg_fps": 2669.9,
-   "low_1pct_fps": 741.491,
-   "low_01pct_fps": 294.727,
-   "p50_ms": 0.345,
-   "p95_ms": 0.501,
-   "p99_ms": 0.86,
-   "p999_ms": 1.431,
-   "max_ms": 9.257,
-   "histogram": [
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-  },
-  {
-   "phase": "ocean",
-   "repeat": 1,
-   "frames": 31854,
-   "seconds": 12.0,
-   "avg_fps": 2654.471,
-   "low_1pct_fps": 747.759,
-   "low_01pct_fps": 302.422,
-   "p50_ms": 0.347,
-   "p95_ms": 0.503,
-   "p99_ms": 0.853,
-   "p999_ms": 1.404,
-   "max_ms": 13.925,
-   "histogram": [
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-  },
-  {
-   "phase": "ocean",
-   "repeat": 2,
-   "frames": 25022,
-   "seconds": 12.0,
-   "avg_fps": 2085.121,
-   "low_1pct_fps": 576.803,
-   "low_01pct_fps": 262.183,
-   "p50_ms": 0.428,
-   "p95_ms": 0.758,
-   "p99_ms": 1.214,
-   "p999_ms": 2.109,
-   "max_ms": 9.206,
-   "histogram": [
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-  {
-   "phase": "mountain",
-   "repeat": 0,
-   "frames": 33745,
-   "seconds": 12.0,
-   "avg_fps": 2812.075,
-   "low_1pct_fps": 736.0,
-   "low_01pct_fps": 258.279,
-   "p50_ms": 0.327,
-   "p95_ms": 0.471,
-   "p99_ms": 0.808,
-   "p999_ms": 1.689,
-   "max_ms": 10.07,
-   "histogram": [
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-  {
-   "phase": "mountain",
-   "repeat": 1,
-   "frames": 33294,
-   "seconds": 12.0,
-   "avg_fps": 2774.461,
-   "low_1pct_fps": 763.45,
-   "low_01pct_fps": 295.503,
-   "p50_ms": 0.334,
-   "p95_ms": 0.471,
-   "p99_ms": 0.813,
-   "p999_ms": 1.63,
-   "max_ms": 8.512,
-   "histogram": [
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-  },
-  {
-   "phase": "mountain",
-   "repeat": 2,
-   "frames": 26747,
-   "seconds": 12.0,
-   "avg_fps": 2228.824,
-   "low_1pct_fps": 599.44,
-   "low_01pct_fps": 239.602,
-   "p50_ms": 0.403,
-   "p95_ms": 0.678,
-   "p99_ms": 1.107,
-   "p999_ms": 2.054,
-   "max_ms": 9.178,
-   "histogram": [
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-  }
- ],
- "label": "vanilla-win-9800x3d-5080"
-}

benchmarks/perf/windows-9800x3d-5080-2026-10-29.md

@@ -1,106 +0,0 @@
-# Horizon v0.2.97 vs vanilla 26.3 on Windows 11: Ryzen 7 9800X3D + RTX 5080 (2026-10-29, RD 8 and 32 rerun 2026-10-30)
-
-The first `tools/perf_bench.py` run on Windows ([docs/benchmark.md](../../docs/benchmark.md)): Horizon, vanilla 26.3 and
-vanilla with performance mods, render distances 8, 16 and 32, 1280x720, three games each, every game from a fresh
-world. The reports are the `*-win-9800x3d-5080-rd*.json` files next to this page.
-
-```sh
-python tools/perf_bench.py --table horizon-win-9800x3d-5080 vanilla-win-9800x3d-5080 vanilla-mods-win-9800x3d-5080
-```
-
-## Setup
-
-- **Machine:** AMD Ryzen 7 9800X3D (8 cores, 16 threads), 94 GB RAM (DDR5, EXPO off), NVIDIA GeForce RTX 5080
-  (driver 617.42), Windows 11 Pro 26200, Balanced power plan, desktop. One 1920x1080 120 Hz display. The game windows
-  were on the desktop of an unlocked session.
-- **Horizon:** release v0.2.97 as the launcher installs it (`--build %APPDATA%\horizon-launcher\versions\v0.2.97`,
-  `--resources` its `.local\horizon-client\26.3`), Vulkan.
-- **Vanilla:** the 26.3 client jar with Fabric Loader 0.19.5 and the driver mod, Java 25.0.5 (Temurin), `-Xmx2G`
-  with the launcher's G1 flags and the manifest's `-XX:StackShadowPages=32`, OpenGL 3.3.
-- **Vanilla + mods:** the same with Sodium mc26.3-0.9.2, Lithium mc26.3-0.26.2, FerriteCore 9.0.0 and
-  ImmediatelyFast 1.17.1 (`tools/benchmark-deps/mods.lock.json`).
-- **Commands:** `python tools/perf_bench.py --game <game> --label <game>-win-9800x3d-5080 --distances <d>
-  --sizes 1280x720 --repeats 3` (plus `--build` and `--resources` for Horizon), with the games taking turns at
-  each distance.
-- **Memory** is the working set on Windows (what Task Manager shows), sampled from outside the process. Horizon's
-  GPU figure is its own Vulkan allocator total. `nvidia-smi` gives no per-process figure under WDDM, so vanilla has
-  none.
-
-## Load
-
-Windows has no load average, so the reports have no `load_avg_1m`. Every game ran on an otherwise idle machine:
-
-- **RD 8 and RD 32** (rerun on 2026-10-30, after the first pass had builds running alongside): a script started each
-  game only once no `rustc`, `cargo`, `link` (or other compiler) process and no other game (`horizon-client`, `java`,
-  `javaw`, Minecraft) was running, and the machine's CPU load had stayed under 15 % in every 5-second sample for
-  30 seconds. During each game it sampled every 2 seconds the machine's CPU load and the CPU of everything outside the
-  benchmark's own processes. A game during which a compiler or another game ran, or other processes used over 15 % of
-  the machine for 10 seconds, was discarded and run again: two of the 20 games were (vanilla + mods at RD 32, a
-  build started during one, background processes during the other).
-- **RD 16** (2026-10-29): no `rustc`, `cargo` or `link` process at any point, the load logged every 5 seconds.
-
-| Game | RD | Mean / max CPU load (machine, the game included) | Other processes' CPU, mean / max | Compiler processes |
-|---|---|---|---|---|
-| Horizon | 8 | 18 % / 49 % | 6 % / 12 % | 0 |
-| Vanilla | 8 | 28 % / 75 % | 7 % / 20 % | 0 |
-| Vanilla + mods | 8 | 30 % / 81 % | 7 % / 20 % | 0 |
-| Horizon | 16 | 29 % / 80 % | – | 0 |
-| Vanilla | 16 | 41 % / 91 % | – | 0 |
-| Vanilla + mods | 16 | 51 % / 90 % | – | 0 |
-| Horizon | 32 | 36 % / 100 % | 5 % / 15 % | 0 |
-| Vanilla | 32 | 39 % / 73 % | 6 % / 18 % | 0 |
-| Vanilla + mods | 32 | 42 % / 88 % | 6 % / 21 % | 0 |
-
-"Other processes" is the machine's load minus the benchmark's own processes (the game and `perf_bench.py`), in
-2-second samples. Most of it is the system's share of the game's own drawing (the graphics driver and the
-compositor), which no process of the benchmark is charged for; the desktop apps left open (a browser, chat apps)
-briefly reached 5 % at most. RD 16's load was logged from outside every 5 seconds, so it has no such split, and its mean includes the time between
-games. Compared with the first pass, the idle RD 8 runs give Horizon about 10 % higher averages and about 50 % higher
-1% lows, and vanilla up to 10 % higher averages.
-
-## Results
-
-Mean of 3 games ± 95% confidence interval. FPS over the 12-second flight at 16 blocks/s (average / 1% low /
-0.1% low):
-
-| RD | scene | Horizon v0.2.97 | Vanilla 26.3 | Vanilla + mods |
-| --- | --- | --- | --- | --- |
-| 8 | forest | 3495 ±276 / 1295 ±397 / 859 ±298 | 2457 ±836 / 625 ±224 / 252 ±52 | 2425 ±65 / 733 ±30 / 250 ±22 |
-| 8 | mountain | 3376 ±67 / 1384 ±168 / 850 ±256 | 2605 ±811 / 700 ±218 / 264 ±71 | 2538 ±167 / 760 ±34 / 241 ±44 |
-| 8 | ocean | 3346 ±147 / 1358 ±237 / 912 ±235 | 2470 ±828 / 689 ±241 / 286 ±53 | 2432 ±82 / 764 ±37 / 262 ±37 |
-| 8 | village | 2942 ±197 / 1271 ±146 / 839 ±94 | 2217 ±112 / 545 ±37 / 215 ±14 | 2104 ±101 / 577 ±84 / 196 ±47 |
-| 16 | forest | 2424 ±138 / 709 ±165 / 401 ±100 | 1912 ±324 / 402 ±89 / 149 ±25 | 1746 ±32 / 461 ±27 / 179 ±9 |
-| 16 | mountain | 1961 ±99 / 537 ±96 / 297 ±75 | 1653 ±153 / 332 ±27 / 113 ±8 | 1500 ±55 / 408 ±40 / 140 ±10 |
-| 16 | ocean | 2201 ±183 / 554 ±251 / 325 ±326 | 1861 ±289 / 446 ±142 / 165 ±29 | 1815 ±119 / 514 ±142 / 192 ±58 |
-| 16 | village | 1712 ±192 / 593 ±80 / 358 ±69 | 1218 ±65 / 318 ±16 / 127 ±5 | 1282 ±162 / 343 ±25 / 132 ±12 |
-| 32 | forest | 1389 ±70 / 504 ±33 / 330 ±118 | 1203 ±51 / 228 ±13 / 108 ±12 | 929 ±8 / 313 ±41 / 129 ±32 |
-| 32 | mountain | 1086 ±34 / 258 ±78 / 108 ±37 | 815 ±61 / 55 ±13 / 8 ±3 | 645 ±10 / 166 ±12 / 86 ±21 |
-| 32 | ocean | 1189 ±27 / 155 ±9 / 68 ±8 | 1223 ±33 / 236 ±17 / 99 ±21 | 1017 ±14 / 325 ±38 / 117 ±28 |
-| 32 | village | 1164 ±9 / 416 ±39 / 216 ±86 | 882 ±48 / 184 ±12 / 83 ±17 | 926 ±17 / 250 ±5 / 93 ±11 |
-
-Startup, loading and memory (means of 3 games):
-
-| RD | | Horizon v0.2.97 | Vanilla 26.3 | Vanilla + mods |
-| --- | --- | --- | --- | --- |
-| 8 | start to title / in-world | 3.0 s / 6.1 s | 7.7 s / 13.9 s | 11.1 s / 17.6 s |
-| 8 | mean scene load | 1.3 s | 4.0 s | 3.6 s |
-| 8 | working set, steady / peak | 1082 / 1172 MB | 1913 / 2120 MB | 1904 / 2053 MB |
-| 16 | start to title / in-world | 3.2 s / 7.2 s | 7.7 s / 19.9 s | 10.8 s / 23.5 s |
-| 16 | mean scene load | 2.4 s | 9.2 s | 9.0 s |
-| 16 | working set, steady / peak | 1236 / 1459 MB | 2300 / 2540 MB | 2327 / 2496 MB |
-| 32 | start to title / in-world | 2.9 s / 10.5 s | 7.5 s / 35.4 s | 11.0 s / 39.2 s |
-| 32 | mean scene load | 5.7 s | 21.1 s | 19.9 s |
-| 32 | working set, steady / peak | 1730 / 2045 MB | 2799 / 2892 MB | 2895 / 2965 MB |
-
-## What it shows
-
-- At RD 8 and 16, Horizon's average FPS is 18–42 % above vanilla's in every scene. Its 1% lows are 1.2–2.3 times
-  vanilla's and its 0.1% lows 2.0–3.9 times. On this CPU and GPU the performance mods leave vanilla's averages
-  level or slightly lower, and raise its 1% lows by 6–23 %.
-- At RD 32, Horizon's average is 15–33 % above vanilla's over the forest, the mountain and the village, with 1% lows
-  2.2–4.7 times vanilla's. Over the ocean its average is level with vanilla's, but its lows are lower than vanilla's
-  and the modded client's (155 vs 236 and 325 FPS 1% low, 68 vs 99 and 117 FPS 0.1% low), on an idle machine too.
-  That scene is worth a closer look.
-- Horizon reaches the title screen 2.4–2.6 times faster than vanilla (3.4–3.8 times faster than the modded client)
-  and loads a scene's chunks 3–4 times faster. Its steady working set is 38–46 % smaller.
-- Each game uses its own graphics API: Horizon Vulkan, vanilla OpenGL. That difference is part of what's compared.

crates/cargo-horizon-mod/Cargo.toml

@@ -4,22 +4,11 @@ version = "0.1.0"
 edition.workspace = true
 license.workspace = true
 rust-version = "1.86"
-description = "cargo horizon-mod new/build/run/check: make Horizon content mods (docs/mods.md)"
-
-# `cargo binstall --git https://github.com/horizon-rust/horizon cargo-horizon-mod` (#2120) reads this: the archive
-# `cargo-horizon-mod`'s workflow attaches to the `cargo-horizon-mod-v<version>` release for the runner's target,
-# holding the binary at its root. tools/horizon_mod_binstall.py expands it for the workflow's targets.
-[package.metadata.binstall]
-pkg-url = "https://github.com/horizon-rust/horizon/releases/download/cargo-horizon-mod-v{ version }/{ name }-{ target }.tar.gz"
-bin-dir = "{ bin }{ binary-ext }"
-pkg-fmt = "tgz"
+description = "cargo horizon-mod new/build/run/check: make Horizon mods in Rust (docs/mods.md)"
 
 [dependencies]
-horizon-mods = { path = "../horizon-mods", default-features = false, features = ["index"] }
+horizon-mods = { path = "../horizon-mods", default-features = false, features = ["pack", "runtime", "index"] }
 serde_json = "1.0.151"
 
-[dev-dependencies]
-zip = { version = "9.1.3", default-features = false, features = ["deflate"] }
-
 [lints]
 workspace = true

crates/cargo-horizon-mod/src/check.rs

@@ -1,19 +1,35 @@
 //! `cargo horizon-mod check <file>`: what the registry checks of a submission,
 //! run anywhere: its kind's own checks (docs/api/mod-index.md), its signature
-//! when given a key, and for a `.hmod` that it is content only.
+//! when given a key, and for a mod a trial run in the sandbox: it must start,
+//! survive ticks, frames, a chat line and each of its commands (a server mod:
+//! a player joining, chatting, typing them and leaving), and import no more
+//! than its capabilities.
 use horizon_mods::{
-    Package,
+    Clock, GameMode, Mods, Output, Package, Player, ServerPlayer, Snapshot, Status,
     index::{self, Facts, Kind},
+    manifest::component_imports,
 };
 use serde_json::{Value, json};
 use std::path::Path;
 
+/// How long the trial run plays: two seconds of game.
+const TICKS: u64 = 40;
+const FRAMES_PER_TICK: u64 = 3;
+
 pub struct Report {
     pub kind: Kind,
     pub facts: Facts,
     pub sha256: String,
     pub size: u64,
     pub signed: bool,
+    /// A mod has code to run (a content mod may have none).
+    pub code: bool,
+    /// A mod's component imports.
+    pub imports: Vec<String>,
+    /// A mod's commands, each run once.
+    pub commands: Vec<String>,
+    /// What the mod showed during the trial run.
+    pub output: Vec<String>,
 }
 
 impl Report {
@@ -37,6 +53,10 @@ impl Report {
             "sha256": self.sha256,
             "size": self.size,
             "signed": self.signed,
+            "code": self.code,
+            "imports": self.imports,
+            "commands": self.commands,
+            "output": self.output,
         })
     }
 
@@ -80,8 +100,18 @@ impl Report {
         if self.kind == Kind::NativeMod {
             out += "  native source: unsandboxed; not executed by the registry check. Compile and test against the exact pinned Horizon and Mixins revisions before review.\n";
         }
-        if self.kind == Kind::Mod {
+        if self.kind == Kind::Mod && !self.code {
             out += "  no code: content only, nothing to run\n";
+        } else if self.kind == Kind::Mod {
+            let commands = if self.commands.is_empty() {
+                String::new()
+            } else {
+                format!(", /{}", self.commands.join(", /"))
+            };
+            out += &format!(
+                "  trial run: started, {TICKS} ticks, {} frames, a chat line{commands}: ok\n",
+                TICKS * FRAMES_PER_TICK
+            );
         }
         out
     }
@@ -123,26 +153,145 @@ pub fn check(
         (None, None) => false,
         _ => return Err("--key and --signature go together".into()),
     };
-    if kind == Kind::Mod {
-        content_only(path)?;
-    }
-    Ok(Report {
+    let mut report = Report {
         kind,
         facts,
         sha256: index::sha256_file(path)?,
         size,
         signed,
-    })
+        code: false,
+        imports: Vec::new(),
+        commands: Vec::new(),
+        output: Vec::new(),
+    };
+    if report.kind == Kind::Mod {
+        trial_run(path, &mut report)?;
+    }
+    Ok(report)
 }
 
-/// A mod is content only: WebAssembly code mods don't run any more, code mods are native
-/// (`.hnmod`, docs/native-mods.md). `inspect` already read its content as the game does.
-fn content_only(path: &Path) -> Result<(), String> {
-    match Package::read(path)?.wasm {
-        Some(_) => Err(
-            "it has WebAssembly code, which Horizon doesn't run any more: make it a native mod (docs/native-mods.md)"
-                .into(),
-        ),
+/// Runs a mod in the sandbox, as the game does, from a scratch copy so its
+/// storage lands in a folder removed afterwards. A content mod has no code to
+/// run: `inspect` already read its content as the game does.
+fn trial_run(path: &Path, report: &mut Report) -> Result<(), String> {
+    let package = Package::read(path)?;
+    let Some(wasm) = package.wasm.as_deref() else {
+        return Ok(());
+    };
+    report.code = true;
+    report.imports = component_imports(wasm)?;
+    package
+        .manifest
+        .check_imports(report.imports.iter().map(String::as_str))?;
+    let dir = std::env::temp_dir().join(format!("horizon-mod-check-{}", std::process::id()));
+    let _ = std::fs::remove_dir_all(&dir);
+    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
+    let copy = dir.join("mod.hmod");
+    let result = std::fs::copy(path, &copy)
+        .map_err(|e| e.to_string())
+        .and_then(|_| play(&copy, report));
+    let _ = std::fs::remove_dir_all(&dir);
+    result
+}
+
+fn play(path: &Path, report: &mut Report) -> Result<(), String> {
+    let mut mods = Mods::load(&[path.to_path_buf()], |_| true, |_| false);
+    let failed = |mods: &Mods| match &mods.entries()[0].status {
+        Status::Failed(reason) => Some(reason.clone()),
+        _ => None,
+    };
+    if let Some(reason) = failed(&mods) {
+        return Err(format!("it didn't start: {reason}"));
+    }
+    let client: Vec<String> = mods.commands().map(str::to_owned).collect();
+    let server: Vec<String> = mods.server_commands().map(|c| c.name.clone()).collect();
+    report.commands = [client.clone(), server.clone()].concat();
+    // A server mod plays with one player on, who joins, chats and leaves.
+    let steve = ServerPlayer {
+        id: "00000000-0000-4000-8000-000000000001".into(),
+        name: "Steve".into(),
+        x: 0.5,
+        y: 64.0,
+        z: 0.5,
+        dimension: "minecraft:overworld".into(),
+        game_mode: GameMode::Survival,
+        health: 20.0,
+    };
+    let snapshot = |t: u64| Snapshot {
+        player: Some(Player {
+            x: 0.5 + t as f64 * 0.1,
+            y: 64.0,
+            z: 0.5,
+            yaw: 90.0,
+            pitch: 0.0,
+            health: 20.0,
+            food: 20,
+            dimension: "minecraft:overworld".into(),
+        }),
+        clock: Some(Clock {
+            game_time: t,
+            day_time: 1000 + t,
+        }),
+        players: vec![steve.clone()],
+        // The GUI of a 1280 x 720 window at scale 3.
+        gui_size: (427.0, 240.0),
+        ..Snapshot::default()
+    };
+    mods.set_snapshot(snapshot(0));
+    mods.player_joined(&steve);
+    for t in 0..TICKS {
+        mods.set_snapshot(snapshot(t));
+        mods.tick(t);
+        mods.server_tick(t);
+        for _ in 0..FRAMES_PER_TICK {
+            mods.frame(1.0 / 60.0);
+        }
+    }
+    mods.chat("<Steve> hello");
+    mods.player_chat(&steve, "hello");
+    for name in &client {
+        mods.command(name);
+    }
+    for name in &server {
+        mods.server_command(&steve, name);
+    }
+    mods.set_snapshot(Snapshot::default());
+    mods.player_left(&steve);
+    for out in mods.drain() {
+        report.output.push(match out {
+            Output::Chat { text, .. } => format!("chat: {text}"),
+            Output::Tell { text, .. } => format!("tell: {text}"),
+            Output::Broadcast { text, .. } => format!("broadcast: {text}"),
+            Output::Feedback { text, error } | Output::Reply { text, error, .. } => {
+                format!("{}: {text}", if error { "error" } else { "feedback" })
+            }
+            Output::Command { line } => format!("command: /{line}"),
+            Output::QuietCommands { lines, .. } => {
+                format!("{} quiet command(s)", lines.len())
+            }
+            Output::Stopped { reason, .. } => return Err(format!("it stopped: {reason}")),
+            Output::SetBlocks {
+                dimension, blocks, ..
+            } => {
+                format!("set {} block(s) in {dimension}", blocks.len())
+            }
+            Output::OpenScreen { .. } => "opened a screen".to_string(),
+            Output::CloseScreen { .. } => "closed its screen".to_string(),
+            Output::PlaceRecipe { book_id, all } => {
+                format!("placed recipe {book_id}{}", if all { " (all)" } else { "" })
+            }
+            Output::Give { item, count, .. } => format!("gave {count} {item}"),
+            Output::Shake { strength, seconds } => {
+                format!("shook the camera: {strength:.2} for {seconds:.1} s")
+            }
+        });
+    }
+    let shapes = mods.hud_shapes().count();
+    if shapes > 0 {
+        report.output.push(format!("drew {shapes} HUD shape(s)"));
+    }
+    match failed(&mods) {
+        Some(reason) => Err(format!("it stopped: {reason}")),
         None => Ok(()),
     }
 }
@@ -167,7 +316,7 @@ mod tests {
                 .text()
                 .contains("cozy 1.0.0 (modpack, format 1, for 26.3)")
         );
-        // A mod with WebAssembly code is refused: code mods are native.
+        // The fixture mod's code is a stand-in: its manifest reads, its run fails.
         let hmod = fixture("coords_hud-0.1.0.hmod");
         let key = std::fs::read_to_string(fixture("test.pub")).unwrap();
         let sig = std::fs::read_to_string(fixture("coords_hud-0.1.0.hmod.minisig")).unwrap();
@@ -175,7 +324,7 @@ mod tests {
         let e = check(&hmod, Kind::Mod, Some(key), Some(&sig))
             .err()
             .unwrap();
-        assert!(e.contains("native mod"), "{e}");
+        assert!(e.contains("didn't start"), "{e}");
         let e = check(
             &hmod,
             Kind::Mod,

crates/cargo-horizon-mod/src/main.rs

@@ -1,24 +1,32 @@
-//! `cargo horizon-mod`: make Horizon content mods (`docs/modpacks.md`): blocks,
-//! items, data and assets, no code. Code mods are native (docs/native-mods.md).
+//! `cargo horizon-mod`: make Horizon mods in Rust (`docs/mods.md`).
 //!
-//! - `new <path> [--name "Name"]`: a content mod from the template; with
-//!   `--template native [--horizon <commit>]`, a native trait mod's bundle.
-//! - `build`: the `.hmod` in `target/horizon-mod/`, with the mod's `assets/`
-//!   and `data/`.
+//! - `new <path> [--template code|content] [--name "Name"] [--sdk-path <dir>]`:
+//!   a mod from a template: a Rust crate, or a content mod (no code).
+//! - `build [--debug]`: the `.hmod` in `target/horizon-mod/`, with the mod's
+//!   `assets/` and `data/`; a folder without `Cargo.toml` is content only.
 //! - `run [--game <horizon-client>] [-- <game args>]`: build, then play with
-//!   the mod.
+//!   the mod; run `build` again and the game reloads it.
+//! - `test [--debug] [--hmod <file>] [<name>]`: build, then run the mod's
+//!   `tests/*.toml` scripts in the sandbox, with no game.
 //! - `check <file> [--json]`: what the registry checks of a submission
-//!   (`.hmod`, `.hnmod`, `.hpack`, resource pack `.zip`, `.hshader`).
+//!   (`.hmod`, `.hpack`, resource pack `.zip`), with a trial run for a mod.
 //! - `registry build|review|check|list`: the registry repository's CI.
-use horizon_mods::{Capability, Content, Manifest, Package, manifest::MANIFEST};
+use horizon_mods::{
+    Capability, Content, Manifest, Package,
+    manifest::{MANIFEST, component_imports, componentize},
+    testing::{Script, TestGame},
+};
 mod check;
 mod registry;
 
 use std::{
     path::{Path, PathBuf},
-    process::{Command, ExitCode},
+    process::{Command, ExitCode, Stdio},
 };
 
+const TARGET: &str = "wasm32-unknown-unknown";
+const SDK_GIT: &str = "{ git = \"https://github.com/horizon-rust/horizon\" }";
+
 fn main() -> ExitCode {
     // Cargo runs `cargo-horizon-mod horizon-mod <args>`.
     let mut args: Vec<String> = std::env::args().skip(1).collect();
@@ -27,13 +35,14 @@ fn main() -> ExitCode {
     }
     let result = match args.first().map(String::as_str) {
         Some("new") => new(&args[1..]),
-        Some("build") => build().map(|p| {
+        Some("build") => build(!args.iter().any(|a| a == "--debug")).map(|p| {
             println!("Built {}", p.display());
         }),
         Some("run") => run(&args[1..]),
+        Some("test") => test(&args[1..]),
         Some("check") => check(&args[1..]),
         Some("registry") => registry::main(&args[1..]),
-        _ => Err("usage: cargo horizon-mod new <path> [--name \"Name\"] [--template content|native [--horizon <commit>]] | build | run [--game <horizon-client>] [-- <game args>] | check <file> [--kind <kind>] [--key <public key> --signature <file.minisig>] [--json] | registry build|review|check|list".into()),
+        _ => Err("usage: cargo horizon-mod new <path> [--template code|content] | build [--debug] | run [--game <horizon-client>] [-- <game args>] | test [--debug] [--hmod <file>] [<name>] | check <file> [--kind <kind>] [--key <public key> --signature <file.minisig>] [--json] | registry build|review|check|list".into()),
     };
     match result {
         Ok(()) => ExitCode::SUCCESS,
@@ -74,14 +83,31 @@ fn new(args: &[String]) -> Result<(), String> {
         })
         .collect();
     let name = flag(args, "--name").map_or_else(|| base.replace(['-', '_'], " "), str::to_string);
-    let fill = |t: &str| t.replace("{id}", &id).replace("{name}", &name);
-    match flag(args, "--template") {
-        None | Some("content") => {}
-        Some("native") => return new_native(dir, &id, flag(args, "--horizon"), fill),
-        Some(_) => return Err("--template is content or native".into()),
-    }
+    let sdk = match flag(args, "--sdk-path") {
+        Some(p) => {
+            let p = std::fs::canonicalize(p).map_err(|e| format!("--sdk-path {p}: {e}"))?;
+            format!("{{ path = {:?} }}", p.display().to_string())
+        }
+        None => SDK_GIT.to_string(),
+    };
+    let fill = |t: &str| {
+        t.replace("{crate}", &id.replace('_', "-"))
+            .replace("{id}", &id)
+            .replace("{name}", &name)
+            .replace("{sdk}", &sdk)
+    };
+    let code = [
+        ("Cargo.toml", include_str!("../template/Cargo.toml.in")),
+        (MANIFEST, include_str!("../template/horizon-mod.toml")),
+        ("src/lib.rs", include_str!("../template/src/lib.rs")),
+        (".gitignore", include_str!("../template/gitignore")),
+        (
+            "tests/hello.toml",
+            include_str!("../template/tests/hello.toml"),
+        ),
+    ];
     // A block copying a vanilla one, with its model, name, loot, recipe and tag.
-    let files = [
+    let content = [
         (
             MANIFEST,
             include_str!("../template/content/horizon-mod.toml"),
@@ -120,7 +146,12 @@ fn new(args: &[String]) -> Result<(), String> {
         ),
         (".gitignore", include_str!("../template/gitignore")),
     ];
-    for (file, text) in files {
+    let files: &[(&str, &str)] = match flag(args, "--template").unwrap_or("code") {
+        "code" => &code,
+        "content" => &content,
+        other => return Err(format!("no template {other}: code or content")),
+    };
+    for &(file, text) in files {
         let file = fill(file);
         let file = file.as_str();
         let to = dir.join(file);
@@ -138,85 +169,29 @@ fn new(args: &[String]) -> Result<(), String> {
     Ok(())
 }
 
-/// A native trait mod's bundle in `dir` (docs/native-mods.md, "Trait mods"): its
-/// `horizon-mixin.toml` and an `[api]` crate with one hook. It is what the launcher
-/// builds (`native-build <dir>`) and packs as `mixins/<id>/` of a `.hnmod`
-/// (docs/api/mod-files.md). `horizon` pins the Horizon commit it is made for.
-fn new_native(
-    dir: &Path,
-    id: &str,
-    horizon: Option<&str>,
-    fill: impl Fn(&str) -> String,
-) -> Result<(), String> {
-    // `[mod] id`, as `horizon-native.json` needs it: the template keeps to its characters.
-    if id.len() > 64 {
-        return Err(format!("mod id {id}: 64 characters at most"));
-    }
-    let (compatibility, rev) = match horizon {
-        Some(commit) if horizon_mods::index::native::revision(commit) => (
-            format!("[compatibility]\nhorizon_revision = \"{commit}\"\n"),
-            format!(", rev = \"{commit}\""),
-        ),
-        Some(commit) => {
-            return Err(format!(
-                "--horizon {commit}: a Horizon commit is 40 lowercase hex digits"
-            ));
-        }
-        // Unpinned, it builds on the instance's own Horizon.
-        None => (
-            "# The Horizon commit it is made for; unpinned, it builds on the instance's own.\n\
-             # [compatibility]\n# horizon_revision = \"<40 hex digits>\"\n"
-                .to_owned(),
-            String::new(),
-        ),
-    };
-    let files = [
-        (
-            "horizon-mixin.toml",
-            include_str!("../template/native/horizon-mixin.toml"),
-        ),
-        (
-            "api/Cargo.toml",
-            include_str!("../template/native/api.toml"),
-        ),
-        ("api/src/lib.rs", include_str!("../template/native/lib.rs")),
-        (".gitignore", include_str!("../template/gitignore")),
-    ];
-    for (file, text) in files {
-        let to = dir.join(file);
-        std::fs::create_dir_all(to.parent().expect("a file in the mod"))
-            .map_err(|e| e.to_string())?;
-        let text = fill(text)
-            .replace("{compatibility}", &compatibility)
-            .replace("{rev}", &rev);
-        std::fs::write(&to, text).map_err(|e| format!("{}: {e}", to.display()))?;
-    }
-    println!(
-        "Created {} (native mod id {id}). Next: horizon-launcher native-build {} --instance <instance> --trust-native-code",
-        dir.display(),
-        dir.display()
-    );
-    Ok(())
+/// Builds the mod in the current folder and packs `target/horizon-mod/<id>.hmod`:
+/// the manifest, the crate's component (none without a `Cargo.toml`: a
+/// content mod) and the files in `assets/` and `data/`.
+fn build(release: bool) -> Result<PathBuf, String> {
+    build_in(Path::new("."), release)
 }
 
-/// Packs the content mod in the current folder into `target/horizon-mod/<id>.hmod`: the
-/// manifest and the files in `assets/` and `data/`.
-fn build() -> Result<PathBuf, String> {
-    build_in(Path::new("."))
-}
-
-fn build_in(root: &Path) -> Result<PathBuf, String> {
+fn build_in(root: &Path, release: bool) -> Result<PathBuf, String> {
     let manifest_text = std::fs::read_to_string(root.join(MANIFEST))
         .map_err(|e| format!("{MANIFEST}: {e} (run this in a mod's folder)"))?;
     let manifest = Manifest::parse(&manifest_text)?;
-    if root.join("Cargo.toml").exists() {
-        return Err("a Cargo.toml: code mods are native now (docs/native-mods.md)".into());
-    }
-    if !manifest.capabilities.contains(&Capability::Registries) {
+    let (wasm, target_dir) = if root.join("Cargo.toml").exists() {
+        let (wasm, target) = compile(root, release)?;
+        // The game refuses a component importing capabilities the manifest lacks.
+        manifest.check_imports(component_imports(&wasm)?.iter().map(String::as_str))?;
+        (Some(wasm), target)
+    } else if manifest.capabilities.contains(&Capability::Registries) {
+        (None, root.join("target"))
+    } else {
         return Err(format!(
-            "a content mod has capability registries in {MANIFEST}"
+            "no Cargo.toml: only a content mod (capability registries in {MANIFEST}) has no code"
         ));
-    }
+    };
     // The same checks as the game's, and the files in the order it lists them.
     let content = Content::read(root, &manifest)?;
     let mut reader = content.reader()?;
@@ -225,17 +200,53 @@ fn build_in(root: &Path) -> Result<PathBuf, String> {
         files.push((name.as_str(), reader.read(name)?));
     }
     let files: Vec<(&str, &[u8])> = files.iter().map(|(n, b)| (*n, b.as_slice())).collect();
-    let dir = root.join("target/horizon-mod");
+    let dir = target_dir.join("horizon-mod");
     std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
     let path = dir.join(format!("{}.hmod", manifest.id));
     // Write then rename, so a running game never reads half a file.
     let partial = path.with_extension("hmod.partial");
-    let bytes = Package::write_files(&manifest_text, None, &files)?;
+    let bytes = Package::write_files(&manifest_text, wasm.as_deref(), &files)?;
     std::fs::write(&partial, bytes).map_err(|e| e.to_string())?;
     std::fs::rename(&partial, &path).map_err(|e| e.to_string())?;
     Ok(path)
 }
 
+/// Builds the crate for WebAssembly: its component, and Cargo's target folder.
+fn compile(root: &Path, release: bool) -> Result<(Vec<u8>, PathBuf), String> {
+    let cargo = std::env::var("CARGO").unwrap_or_else(|_| "cargo".into());
+    let mut cmd = Command::new(cargo);
+    cmd.current_dir(root).args([
+        "build",
+        "--lib",
+        "--target",
+        TARGET,
+        "--message-format=json-render-diagnostics",
+    ]);
+    if release {
+        cmd.arg("--release");
+    }
+    let out = cmd
+        .stderr(Stdio::inherit())
+        .output()
+        .map_err(|e| e.to_string())?;
+    if !out.status.success() {
+        return Err(format!(
+            "cargo build failed (is the target installed? rustup target add {TARGET})"
+        ));
+    }
+    let core = String::from_utf8_lossy(&out.stdout)
+        .lines()
+        .filter_map(|l| serde_json::from_str::<serde_json::Value>(l).ok())
+        .filter(|m| m["reason"] == "compiler-artifact")
+        .flat_map(|m| m["filenames"].as_array().cloned().unwrap_or_default())
+        .filter_map(|f| f.as_str().map(PathBuf::from))
+        .rfind(|f| f.extension().is_some_and(|e| e == "wasm"))
+        .ok_or("the build made no .wasm: is the crate a cdylib?")?;
+    let wasm = componentize(&std::fs::read(&core).map_err(|e| e.to_string())?)?;
+    let target = core.ancestors().nth(3).ok_or("unexpected target folder")?;
+    Ok((wasm, target.to_path_buf()))
+}
+
 /// `check <file>`: the registry's checks of a submission, printed; fails
 /// when one does.
 fn check(args: &[String]) -> Result<(), String> {
@@ -267,14 +278,74 @@ fn check(args: &[String]) -> Result<(), String> {
     Ok(())
 }
 
+/// `test`: every `tests/*.toml` script (those whose name holds `<name>`)
+/// against the built mod, or the `.hmod` given with `--hmod`.
+fn test(args: &[String]) -> Result<(), String> {
+    let hmod = match flag(args, "--hmod") {
+        Some(p) => PathBuf::from(p),
+        None => build(!args.iter().any(|a| a == "--debug"))?,
+    };
+    let filter = args
+        .iter()
+        .enumerate()
+        .find(|(i, a)| !a.starts_with("--") && (*i == 0 || args[i - 1] != "--hmod"))
+        .map(|(_, a)| a.as_str());
+    let mut scripts: Vec<PathBuf> = std::fs::read_dir("tests")
+        .map_err(|e| {
+            format!(
+                "tests/: {e} (a mod's tests are tests/<name>.toml: docs/mods.md, \"Testing a mod\")"
+            )
+        })?
+        .filter_map(|e| Some(e.ok()?.path()))
+        .filter(|p| p.extension().is_some_and(|e| e == "toml"))
+        .filter(|p| filter.is_none_or(|f| p.to_string_lossy().contains(f)))
+        .collect();
+    scripts.sort();
+    if scripts.is_empty() {
+        return Err("no tests/*.toml to run".into());
+    }
+    println!(
+        "running {} scripts against {}",
+        scripts.len(),
+        hmod.display()
+    );
+    let mut failed = 0;
+    for path in &scripts {
+        let result = std::fs::read_to_string(path)
+            .map_err(|e| e.to_string())
+            .and_then(|text| Script::parse(&text))
+            .and_then(|script| {
+                let mut game = TestGame::load(&hmod)?;
+                script.run(&mut game)?;
+                Ok(script.steps.len())
+            });
+        match result {
+            Ok(steps) => println!("test {} ... ok ({steps} steps)", path.display()),
+            Err(e) => {
+                failed += 1;
+                println!("test {} ... FAILED\n  {e}", path.display());
+            }
+        }
+    }
+    let passed = scripts.len() - failed;
+    if failed > 0 {
+        return Err(format!("{failed} failed, {passed} passed"));
+    }
+    println!("test result: ok. {passed} passed");
+    Ok(())
+}
+
 fn run(args: &[String]) -> Result<(), String> {
-    let path = build()?;
+    let path = build(true)?;
     let game = flag(args, "--game")
         .map(str::to_string)
         .or_else(|| std::env::var("HORIZON_CLIENT").ok())
         .unwrap_or_else(|| "horizon-client".into());
     let extra = args.iter().skip_while(|a| *a != "--").skip(1);
-    println!("Starting {game} with {}", path.display());
+    println!(
+        "Starting {game} with {} (rebuild with `cargo horizon-mod build` to reload it)",
+        path.display()
+    );
     let status = Command::new(&game)
         .arg("--dev-mod")
         .arg(&path)
@@ -293,6 +364,28 @@ fn run(args: &[String]) -> Result<(), String> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn the_template_is_a_valid_mod() {
+        let dir = std::env::temp_dir().join(format!("horizon-mod-new-{}", std::process::id()));
+        let path = dir.join("My-Mod");
+        new(&[path.display().to_string(), "--name".into(), "My Mod".into()]).unwrap();
+        let manifest =
+            Manifest::parse(&std::fs::read_to_string(path.join(MANIFEST)).unwrap()).unwrap();
+        assert_eq!(
+            (manifest.id.as_str(), manifest.name.as_str()),
+            ("my_mod", "My Mod")
+        );
+        let cargo = std::fs::read_to_string(path.join("Cargo.toml")).unwrap();
+        assert!(cargo.contains("name = \"my-mod\"") && cargo.contains(SDK_GIT));
+        let script = std::fs::read_to_string(path.join("tests/hello.toml")).unwrap();
+        assert_eq!(Script::parse(&script).unwrap().steps.len(), 3);
+        assert!(
+            new(&[path.display().to_string()]).is_err(),
+            "never overwrites"
+        );
+        std::fs::remove_dir_all(&dir).unwrap();
+    }
+
     #[test]
     fn the_content_template_builds_and_checks_with_no_code() {
         let dir = std::env::temp_dir().join(format!("horizon-mod-content-{}", std::process::id()));
@@ -304,7 +397,7 @@ mod tests {
         ];
         new(&new_args).unwrap();
         assert!(!path.join("Cargo.toml").exists());
-        let hmod = build_in(&path).unwrap();
+        let hmod = build_in(&path, true).unwrap();
         assert_eq!(hmod, path.join("target/horizon-mod/gems.hmod"));
         let package = Package::read(&hmod).unwrap();
         assert!(package.wasm.is_none());
@@ -316,14 +409,17 @@ mod tests {
         );
         assert_eq!(content.files.len(), 8, "{:?}", content.files);
         let report = check::check(&hmod, check::kind_of(&hmod).unwrap(), None, None).unwrap();
+        assert!(!report.code);
         assert!(
             report.text().contains("no code: content only"),
             "{}",
             report.text()
         );
-        // Code is native now.
-        std::fs::write(path.join("Cargo.toml"), "").unwrap();
-        assert!(build_in(&path).unwrap_err().contains("native"));
+        // Without registries, a mod needs code.
+        let manifest = std::fs::read_to_string(path.join(MANIFEST)).unwrap();
+        let manifest = manifest.replace("[\"registries\"]", "[]");
+        std::fs::write(path.join(MANIFEST), manifest).unwrap();
+        assert!(build_in(&path, true).unwrap_err().contains("no Cargo.toml"));
         assert!(
             new(&[
                 dir.join("x").display().to_string(),
@@ -334,68 +430,4 @@ mod tests {
         );
         std::fs::remove_dir_all(&dir).unwrap();
     }
-
-    #[test]
-    fn the_native_template_packs_into_an_hnmod_the_registry_accepts() {
-        use std::io::Write;
-        let dir = std::env::temp_dir().join(format!("horizon-mod-native-{}", std::process::id()));
-        let path = dir.join("machine-mod");
-        let commit = "0123456789abcdef0123456789abcdef01234567";
-        let args = [
-            path.display().to_string(),
-            "--template".into(),
-            "native".into(),
-            "--horizon".into(),
-            commit.into(),
-        ];
-        new(&args).unwrap();
-        let api = std::fs::read_to_string(path.join("api/Cargo.toml")).unwrap();
-        assert!(api.contains(&format!("rev = \"{commit}\"")), "{api}");
-        // Packed as the launcher packs a mod folder: the manifest, then the bundle under
-        // `mixins/<id>/` (docs/api/mod-files.md).
-        let manifest = serde_json::json!({
-            "schema": 1, "id": "machine_mod", "version": "0.1.0", "game": "26.3",
-            "horizon": commit, "mixins": "b".repeat(40),
-        });
-        let hnmod = dir.join("machine_mod.hnmod");
-        let mut zip = zip::ZipWriter::new(std::fs::File::create(&hnmod).unwrap());
-        let options = zip::write::SimpleFileOptions::default();
-        zip.start_file("horizon-native.json", options).unwrap();
-        zip.write_all(manifest.to_string().as_bytes()).unwrap();
-        for file in [
-            "horizon-mixin.toml",
-            "api/Cargo.toml",
-            "api/src/lib.rs",
-            ".gitignore",
-        ] {
-            assert!(horizon_mods::index::native::allowed(file), "{file}");
-            zip.start_file(format!("mixins/machine_mod/{file}"), options)
-                .unwrap();
-            zip.write_all(&std::fs::read(path.join(file)).unwrap())
-                .unwrap();
-        }
-        zip.finish().unwrap();
-        let report = check::check(&hnmod, check::kind_of(&hnmod).unwrap(), None, None).unwrap();
-        assert!(report.text().contains("machine_mod"), "{}", report.text());
-        // A pin that is not a commit is refused; with none, the folder builds on the
-        // instance's Horizon.
-        let bad = [
-            dir.join("bad").display().to_string(),
-            "--template".into(),
-            "native".into(),
-            "--horizon".into(),
-            "main".into(),
-        ];
-        assert!(new(&bad).unwrap_err().contains("40 lowercase hex"));
-        let free = dir.join("free");
-        new(&[
-            free.display().to_string(),
-            "--template".into(),
-            "native".into(),
-        ])
-        .unwrap();
-        let mixin = std::fs::read_to_string(free.join("horizon-mixin.toml")).unwrap();
-        assert!(!mixin.contains("\nhorizon_revision"), "{mixin}");
-        std::fs::remove_dir_all(&dir).unwrap();
-    }
 }

crates/cargo-horizon-mod/src/registry.rs

@@ -13,9 +13,7 @@ const SITE: &str = "https://horizon-rust.github.io/horizon-mods/";
 const USAGE: &str = "usage: cargo horizon-mod registry build <checkout> --files <dir> --out <index.json> [--release <url>] [--site <url>] [--generated <time>]
        cargo horizon-mod registry review <base checkout> <head checkout> --author <login> [--json]
        cargo horizon-mod registry check <base checkout> <head checkout> --files <dir>
-       cargo horizon-mod registry list <checkout>
-       cargo horizon-mod registry release <checkout> <id> <file> --tag <tag> --published <YYYY-MM-DD> [--notes <file>] [--signature <file>] [--game <version>]
-       cargo horizon-mod registry page <checkout> <id> <horizon-registry.toml>";
+       cargo horizon-mod registry list <checkout>";
 
 fn flag<'a>(args: &'a [String], name: &str) -> Option<&'a str> {
     super::flag(args, name)
@@ -156,74 +154,6 @@ pub fn main(args: &[String]) -> Result<(), String> {
             }
             Ok(())
         }
-        // A release of a project's repository, downloaded: the checks of a submission, then the
-        // version as the index lists it (JSON on stdout), for the registry's release sync.
-        Some("release") => {
-            let [checkout, id, file] = pos[..] else {
-                return Err(USAGE.into());
-            };
-            let (tag, published) = (
-                flag(rest, "--tag").ok_or(USAGE)?,
-                flag(rest, "--published").ok_or(USAGE)?,
-            );
-            let read = |name: &str| {
-                flag(rest, name)
-                    .map(|p| std::fs::read_to_string(p).map_err(|e| format!("{p}: {e}")))
-                    .transpose()
-            };
-            let (notes, signature) = (read("--notes")?, read("--signature")?);
-            let entry = entry_of(checkout, id)?;
-            let path = Path::new(file);
-            let cache = registry::Cache::read(Path::new(checkout), id)?;
-            let entry = entry.resolved(&cache.page);
-            let name = path.file_name().and_then(|n| n.to_str()).unwrap_or("");
-            crate::check::check(
-                path,
-                entry.kind.clone(),
-                entry.key.as_deref(),
-                signature.as_deref(),
-            )?;
-            let version = registry::release_version(
-                &entry,
-                &registry::Release {
-                    tag,
-                    published,
-                    notes: notes.as_deref().unwrap_or(""),
-                    asset: flag(rest, "--name").unwrap_or(name),
-                    game: flag(rest, "--game").unwrap_or("26.3"),
-                    signature: signature.as_deref(),
-                },
-                path,
-            )?;
-            println!(
-                "{}",
-                serde_json::to_string(&version).map_err(|e| e.to_string())?
-            );
-            Ok(())
-        }
-        // The page file of a project's repository, checked against its entry: the page as JSON.
-        Some("page") => {
-            let [checkout, id, file] = pos[..] else {
-                return Err(USAGE.into());
-            };
-            let entry = entry_of(checkout, id)?;
-            let text = std::fs::read_to_string(file).map_err(|e| format!("{file}: {e}"))?;
-            let page = registry::page(&entry, &text)?;
-            println!(
-                "{}",
-                serde_json::to_string(&page).map_err(|e| e.to_string())?
-            );
-            Ok(())
-        }
         _ => Err(USAGE.into()),
     }
 }
-
-/// `mods/<id>.toml` of the checkout, which must name a repository.
-fn entry_of(checkout: &str, id: &str) -> Result<registry::Entry, String> {
-    let (entries, _) = registry::load(Path::new(checkout)).map_err(lines)?;
-    entries
-        .into_iter()
-        .find(|e| e.id == id && e.repo.is_some())
-        .ok_or_else(|| format!("{id}: no entry with a repo"))
-}

crates/cargo-horizon-mod/template/Cargo.toml.in

@@ -0,0 +1,14 @@
+[package]
+name = "{crate}"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+horizon-mod-sdk = {sdk}
+
+[profile.release]
+opt-level = "s"
+lto = true

crates/cargo-horizon-mod/template/content/horizon-mod.toml

@@ -3,8 +3,8 @@ name = "{name}"
 version = "0.1.0"
 description = ""
 authors = []
-# A content mod: blocks, items and mob effects from data/ and assets/, no code (API 0.2).
+# A content mod: blocks and items from data/ and assets/, no code (API 0.2).
 api = "0.2"
 side = "both"
-# registries: "May add blocks, items, mob effects and entity types to your worlds".
+# registries: "May add blocks and items to your worlds".
 capabilities = ["registries"]

crates/cargo-horizon-mod/template/horizon-mod.toml

@@ -0,0 +1,12 @@
+id = "{id}"
+name = "{name}"
+version = "0.1.0"
+description = ""
+authors = []
+# The Horizon mod API the SDK targets.
+api = "0.1"
+# client: runs in the player's game.
+side = "client"
+# What the mod may do, shown to players before they turn it on:
+# game-read (position, health, time), chat (show messages), hud (draw text).
+capabilities = ["chat"]

crates/cargo-horizon-mod/template/native/api.toml

@@ -1,9 +0,0 @@
-[package]
-name = "mod-{id}"
-version = "0.1.0"
-edition = "2024"
-
-[dependencies]
-# The launcher points this at the Horizon source it builds the game from. Any other
-# dependency must be a crate and version in Horizon's Cargo.lock.
-horizon-client = { git = "https://github.com/horizon-rust/horizon"{rev} }

crates/cargo-horizon-mod/template/native/horizon-mixin.toml

@@ -1,9 +0,0 @@
-# {name}: a native trait mod (docs/native-mods.md, "Trait mods"). Build it with
-# `horizon-launcher native-build <this folder> --instance <instance> --trust-native-code`.
-[mod]
-id = "{id}"
-version = "0.1.0"
-
-{compatibility}
-[api]
-path = "api"

crates/cargo-horizon-mod/template/native/lib.rs

@@ -1,18 +0,0 @@
-//! The trait mod: the launcher links this crate into the game and calls `hooks()`. Each
-//! method of `Hooks` is one of Horizon's hook points; implement the ones the mod needs
-//! (docs/native-mods.md, "Trait mods").
-use horizon_client::mod_api::{Hooks, Host, PlayerLoggedInEvent, Text};
-
-pub fn hooks() -> Box<dyn Hooks> {
-    Box::new(Mod)
-}
-
-struct Mod;
-
-impl Hooks for Mod {
-    /// A player joined the server (NeoForge's `PlayerLoggedInEvent`): greet them.
-    fn player_logged_in(&self, host: &mut dyn Host, event: &mut PlayerLoggedInEvent<'_>) {
-        let line = format!("{id} says hello, {}!", event.name);
-        host.tell(event.player, Text::literal(line));
-    }
-}

crates/cargo-horizon-mod/template/src/lib.rs

@@ -0,0 +1,19 @@
+use horizon_mod_sdk::{Mod, Registration, chat};
+
+struct MyMod {
+    greeted: u32,
+}
+
+impl Mod for MyMod {
+    fn init() -> Result<(Self, Registration), String> {
+        Ok((MyMod { greeted: 0 }, Registration::new().command("hello")))
+    }
+
+    fn command(&mut self, _name: &str, args: &str) -> Result<Option<String>, String> {
+        self.greeted += 1;
+        chat::show(&format!("Hello {args}! ({} so far)", self.greeted));
+        Ok(None)
+    }
+}
+
+horizon_mod_sdk::export_mod!(MyMod);

crates/cargo-horizon-mod/template/tests/hello.toml

@@ -0,0 +1,14 @@
+# `cargo horizon-mod test` runs every tests/*.toml against the built mod, with no game:
+# steps happen in order, and `expect` checks what the mod showed during the step.
+# Every key: docs/mods.md, "Testing a mod".
+
+[[step]]
+expect.commands = ["hello"]
+
+[[step]]
+command = "hello world"
+expect.chat = ["Hello world! (1 so far)"]
+
+[[step]]
+command = "hello again"
+expect.chat = ["Hello again! (2 so far)"]

crates/horizon-anticheat/Cargo.toml

@@ -1,14 +0,0 @@
-[package]
-name = "horizon-anticheat"
-version = "0.1.0"
-edition.workspace = true
-license.workspace = true
-rust-version = "1.85"
-description = "The dedicated server's anticheat: its [anticheat] settings, violation levels and the checks' rules, with no game state (docs/anticheat.md)"
-
-[dependencies]
-serde = { version = "1", features = ["derive"] }
-toml = "1.1"
-
-[lints]
-workspace = true

crates/horizon-anticheat/src/combat.rs

@@ -1,99 +0,0 @@
-//! Combat: attacks vanilla's client can't send (docs/anticheat.md).
-//!
-//! Vanilla's client sends ServerboundAttackPacket from one place only, `Minecraft.startAttack`, run from
-//! `handleKeybinds` once per client tick. It attacks the entity of the tick's `hitResult`, which
-//! `Minecraft.tick` picks once before the keys are handled, so every attack of one client tick is on the
-//! same entity. And each attack swings the arm (ServerboundPunchPacket) in the same call, so a client
-//! tick never has more attacks than swings: a tick that does comes from a kill aura hiding its swing.
-//! The swing is counted before or after the attack, as older clients behind a version proxy swing
-//! first; a swing without an attack (a miss, a block) is fine.
-
-/// What breaks vanilla's way of attacking.
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum Foul {
-    /// A client tick with more attacks than swings: how many more.
-    NoSwing(u32),
-    /// A second entity attacked in the same client tick: the first one and this one.
-    TwoTargets(i32, i32),
-}
-
-/// The attacks of the client tick being heard.
-#[derive(Clone, Copy, Debug, Default, PartialEq)]
-pub struct Attacks {
-    /// The entity this tick attacked first.
-    target: Option<i32>,
-    attacks: u32,
-    swings: u32,
-}
-
-impl Attacks {
-    /// ServerboundAttackPacket on entity `target`.
-    pub fn attack(&mut self, target: i32) -> Option<Foul> {
-        self.attacks = self.attacks.saturating_add(1);
-        let first = *self.target.get_or_insert(target);
-        (first != target).then_some(Foul::TwoTargets(first, target))
-    }
-
-    /// ServerboundPunchPacket: the arm swung.
-    pub fn swing(&mut self) {
-        self.swings = self.swings.saturating_add(1);
-    }
-
-    /// ServerboundClientTickEndPacket: the tick's attacks are counted, and the next tick picks its
-    /// target again.
-    pub fn tick_end(&mut self) -> Option<Foul> {
-        let unswung = self.attacks.saturating_sub(self.swings);
-        *self = Self::default();
-        (unswung > 0).then_some(Foul::NoSwing(unswung))
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn a_vanilla_tick_is_clean() {
-        let mut a = Attacks::default();
-        // Two clicks in one tick on the same entity, each swung for.
-        for _ in 0..2 {
-            assert_eq!(a.attack(7), None);
-            a.swing();
-        }
-        assert_eq!(a.tick_end(), None);
-        // The next tick may attack another entity, swinging first (an older client).
-        a.swing();
-        assert_eq!(a.attack(8), None);
-        assert_eq!(a.tick_end(), None);
-        // A swing on its own (a miss, a block) is fine.
-        a.swing();
-        assert_eq!(a.tick_end(), None);
-    }
-
-    #[test]
-    fn an_attack_not_swung_for_is_caught() {
-        let mut a = Attacks::default();
-        a.attack(7);
-        assert_eq!(a.tick_end(), Some(Foul::NoSwing(1)));
-        // A swing in the tick before doesn't count for this one.
-        a.swing();
-        a.tick_end();
-        a.attack(7);
-        a.attack(7);
-        a.swing();
-        assert_eq!(a.tick_end(), Some(Foul::NoSwing(1)));
-    }
-
-    #[test]
-    fn two_entities_in_one_tick_are_caught() {
-        let mut a = Attacks::default();
-        a.attack(7);
-        a.swing();
-        assert_eq!(a.attack(8), Some(Foul::TwoTargets(7, 8)));
-        a.swing();
-        // Still against the tick's first target.
-        assert_eq!(a.attack(9), Some(Foul::TwoTargets(7, 9)));
-        a.swing();
-        assert_eq!(a.tick_end(), None);
-    }
-}

crates/horizon-anticheat/src/lib.rs

@@ -1,426 +0,0 @@
-//! The dedicated server's anticheat (docs/anticheat.md), without the game: the `[anticheat]` section of
-//! `server.toml`, each player's violation levels, and the rules of the checks. The server's hub
-//! (`horizon_client::lan`) feeds it what players send and carries out what it decides.
-//!
-//! It is on by default, and so is every check, but only the checks a vanilla client can't trip act on
-//! their own (`combat`); the others log only until they have shown no false positive with real
-//! players (their `setback`, `alert` and `kick` are 0). `enabled = false` turns the anticheat, or one
-//! check, off. A check that fails *flags* the player: its violation level (VL) rises by the flag's
-//! weight and falls back by `decay` a second. From `setback` on, the move or action is cancelled (the
-//! player is sent back where the server last had them); from `alert` on, online operators and the
-//! console are told; from `kick` on, the player is disconnected. A check's kicks are counted per player
-//! across sessions ([`Strikes`]), and the kick that reaches its `ban_after` bans the player instead
-//! (`banned-players.json`, reason "Horizon anticheat: <check>"). Any threshold at 0 turns that action
-//! off.
-//!
-//! The checks are written from vanilla 26.3's own rules and from what cheats are publicly described to
-//! do, never from another anticheat's code.
-
-use std::collections::BTreeMap;
-
-use serde::{Deserialize, Serialize};
-
-pub mod combat;
-pub mod prediction;
-pub mod timer;
-
-/// What one check's violation level leads to.
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub struct Actions {
-    pub setback: f32,
-    pub alert: f32,
-    pub kick: f32,
-    /// Violation level lost each second.
-    pub decay: f32,
-    /// The kick, counting this check's earlier ones for the player, that bans instead; 0: never.
-    pub ban_after: u32,
-}
-
-macro_rules! checks {
-    ($(
-        $(#[$doc:meta])*
-        $field:ident: $Check:ident => $Config:ident [$setback:expr, $alert:expr, $kick:expr, $decay:expr, $ban_after:expr] {
-            $( $(#[$xdoc:meta])* $extra:ident: $ty:ty = $default:expr, )*
-        }
-    )*) => {
-        /// Every check, in the order of the players' violation levels.
-        #[derive(Clone, Copy, Debug, PartialEq, Eq)]
-        pub enum Check { $($Check,)* }
-
-        impl Check {
-            pub const ALL: &[Check] = &[$(Check::$Check,)*];
-            /// Its name in `server.toml` and in alerts.
-            pub fn name(self) -> &'static str {
-                match self { $(Check::$Check => stringify!($field),)* }
-            }
-        }
-
-        $(
-            $(#[$doc])*
-            #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
-            #[serde(default, deny_unknown_fields)]
-            pub struct $Config {
-                pub enabled: bool,
-                pub setback: f32,
-                pub alert: f32,
-                pub kick: f32,
-                pub decay: f32,
-                pub ban_after: u32,
-                $( $(#[$xdoc])* pub $extra: $ty, )*
-            }
-
-            impl Default for $Config {
-                fn default() -> Self {
-                    Self {
-                        enabled: true,
-                        setback: $setback,
-                        alert: $alert,
-                        kick: $kick,
-                        decay: $decay,
-                        ban_after: $ban_after,
-                        $($extra: $default,)*
-                    }
-                }
-            }
-        )*
-
-        /// `server.toml`'s `[anticheat]`: on by default.
-        #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
-        #[serde(default, deny_unknown_fields)]
-        pub struct Config {
-            pub enabled: bool,
-            /// Tell online operators of an alert in their chat (the console and the log always are).
-            pub alerts: bool,
-            /// The permission level a player needs to see alerts.
-            pub alert_level: u8,
-            /// Every flag, one line each, relative to the server's folder; empty: no file.
-            pub log: String,
-            /// The players' kicks by check ([`Strikes`]), relative to the server's folder; empty: kept
-            /// only while the server runs.
-            pub strikes: String,
-            $(pub $field: $Config,)*
-        }
-
-        impl Default for Config {
-            fn default() -> Self {
-                Self {
-                    enabled: true,
-                    alerts: true,
-                    alert_level: 2,
-                    log: "logs/anticheat.log".into(),
-                    strikes: "anticheat-strikes.json".into(),
-                    $($field: $Config::default(),)*
-                }
-            }
-        }
-
-        impl Config {
-            /// Whether `check` runs: the anticheat and the check both on.
-            pub fn runs(&self, check: Check) -> bool {
-                self.enabled && match check { $(Check::$Check => self.$field.enabled,)* }
-            }
-
-            pub fn actions(&self, check: Check) -> Actions {
-                match check {
-                    $(Check::$Check => {
-                        let c = &self.$field;
-                        Actions {
-                            setback: c.setback,
-                            alert: c.alert,
-                            kick: c.kick,
-                            decay: c.decay,
-                            ban_after: c.ban_after,
-                        }
-                    })*
-                }
-            }
-        }
-    };
-}
-
-checks! {
-    /// Timer: more client ticks than the server's clock allows (a sped-up game). Vanilla's client ends
-    /// every tick with ServerboundClientTickEndPacket, at the server's tick rate; each one spends a tick's
-    /// time from a balance that wall-clock time fills, capped so a pause can't be saved up for a burst.
-    /// It logs only by default; once trusted: `setback = 2`, `alert = 5`, `kick = 20`.
-    timer: Timer => TimerConfig [0.0, 0.0, 0.0, 0.02, 0] {
-        /// How far ahead of the clock, in milliseconds, a client may get before it is flagged.
-        tolerance_ms: f64 = 300.0,
-        /// The most time, in milliseconds, a quiet connection banks for the ticks that follow (a lag
-        /// spike's backlog arrives at once).
-        max_lag_ms: f64 = 1000.0,
-    }
-
-    /// Ground: a move that says it ends on the ground with nothing there to stand on: no-fall (claiming
-    /// the ground to skip fall damage) and walking on water. The claim is dropped, so vanilla's
-    /// fall damage follows (the player is never sent back: `setback = 0` makes the check log only), and
-    /// a player that keeps claiming is kicked, then banned at the second kick (`ban_after = 2`). A claim standing still isn't
-    /// judged (no fall to skip). On the official server's first two hours (67 players), every player who
-    /// wasn't flying or walking on water peaked at level 7 (4 claims standing still in one second); the
-    /// ones who were, at 113 to 3749.
-    ground: Ground => GroundConfig [10.0, 15.0, 30.0, 2.0, 2] {}
-
-    /// Prediction: each move played again from the client's own inputs with vanilla's movement code,
-    /// and compared (speed, step, fly, jesus...). Each player's client ticks are recorded
-    /// (`prediction::Record`), with a ping a tick to place what the server changes, and played again
-    /// (horizon-client's `lan::prediction`). A move that lands farther than `tolerance` from the
-    /// replay flags, by how far it lands (one `tolerance` off weighs 1, at most 5 a tick), and the
-    /// setback puts the player back where its moves last agreed. A tick near what the replay can't
-    /// play yet (another entity, a block change or abilities the client hadn't seen, a moving piston,
-    /// a chunk the client doesn't have, a riptide launch) is excused, and so are the ticks after it
-    /// until the moves agree again. It logs only by default; once trusted: `setback = 5`, `alert = 15`,
-    /// `kick = 60`.
-    prediction: Prediction => PredictionConfig [0.0, 0.0, 0.0, 2.0, 0] {
-        /// How far, in blocks, a move may land from where the replay puts it.
-        tolerance: f64 = 0.03,
-    }
-
-    /// Combat: attacks vanilla's client can't send (`combat`): one with no swing after it (a kill aura
-    /// that hides its swing), or a second entity attacked in the same client tick (vanilla attacks the
-    /// one entity under the crosshair, picked once a tick). Each flags once; from `setback` on the
-    /// player's attacks are dropped. A vanilla client never trips it, so it acts by default: the first
-    /// kick warns, the second bans (`ban_after = 2`).
-    combat: Combat => CombatConfig [2.0, 5.0, 20.0, 0.5, 2] {}
-}
-
-/// How many checks there are.
-pub const CHECKS: usize = Check::ALL.len();
-
-impl Config {
-    /// The `[anticheat]` section of a whole `server.toml`; the default (off) when it has none.
-    pub fn from_server_toml(text: &str) -> Result<Self, String> {
-        #[derive(Deserialize)]
-        struct File {
-            #[serde(default)]
-            anticheat: Config,
-        }
-        // Other sections are the supervisor's to check: only this one is read here.
-        let mut table: toml::Table = toml::from_str(text).map_err(|e| e.to_string())?;
-        let mut only = toml::Table::new();
-        if let Some(section) = table.remove("anticheat") {
-            only.insert("anticheat".into(), section);
-        }
-        let file: File = only
-            .try_into()
-            .map_err(|e: toml::de::Error| format!("[anticheat]: {e}"))?;
-        file.anticheat.check()?;
-        Ok(file.anticheat)
-    }
-
-    /// Thresholds can't be negative.
-    pub fn check(&self) -> Result<(), String> {
-        for &c in Check::ALL {
-            let a = self.actions(c);
-            if [a.setback, a.alert, a.kick, a.decay]
-                .iter()
-                .any(|v| !v.is_finite() || *v < 0.0)
-            {
-                return Err(format!(
-                    "anticheat.{}: setback, alert, kick and decay are numbers from 0 up",
-                    c.name()
-                ));
-            }
-        }
-        let tolerance = self.prediction.tolerance;
-        if !tolerance.is_finite() || tolerance <= 0.0 {
-            return Err("anticheat.prediction: tolerance is a number of blocks above 0".into());
-        }
-        Ok(())
-    }
-}
-
-/// How many times each check kicked each player, kept across sessions (`strikes`, a JSON object of
-/// players' UUIDs to check names to counts): the kick that reaches a check's `ban_after` is a ban.
-#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
-#[serde(transparent)]
-pub struct Strikes(pub BTreeMap<String, BTreeMap<String, u32>>);
-
-impl Strikes {
-    /// Player `uuid` was kicked by `check`: its kicks by it so far, this one included, and whether this
-    /// one bans. A ban starts the count again, so a player an operator pardons is kicked before the
-    /// next ban.
-    pub fn kick(&mut self, uuid: &str, check: Check, ban_after: u32) -> (u32, bool) {
-        let count = self
-            .0
-            .entry(uuid.to_owned())
-            .or_default()
-            .entry(check.name().to_owned())
-            .or_default();
-        *count = count.saturating_add(1);
-        let kicks = *count;
-        let ban = ban_after > 0 && kicks >= ban_after;
-        if ban {
-            *count = 0;
-        }
-        (kicks, ban)
-    }
-}
-
-/// What a flag leads to.
-#[derive(Clone, Copy, Debug, Default, PartialEq)]
-pub struct Verdict {
-    /// The check's violation level after the flag.
-    pub vl: f32,
-    /// Cancel the move or action.
-    pub setback: bool,
-    /// Tell operators and the console (at most once a second per check).
-    pub alert: bool,
-    pub kick: bool,
-}
-
-/// One player's anticheat state. Clean players cost nothing: levels only change when a check flags.
-#[derive(Clone, Debug, Default)]
-pub struct Player {
-    vl: [f32; CHECKS],
-    /// The server tick of each check's last flag (its decay runs from there).
-    flagged: [u64; CHECKS],
-    /// The server tick of each check's last alert.
-    alerted: [Option<u64>; CHECKS],
-    pub timer: timer::Balance,
-    /// The server tick and height where the ground last held the player.
-    pub ground: Option<(u64, f64)>,
-    /// The client ticks the prediction plays again (only while it runs).
-    pub record: Option<Box<prediction::Record>>,
-    /// Sprinting as the client's own commands left it (ServerboundPlayerCommandPacket's
-    /// START_SPRINTING and STOP_SPRINTING: LocalPlayer.wasSprinting), which the record's ticks take.
-    /// Not the server's player: a hit with extra knockback stops its sprint
-    /// (Player.causeExtraKnockback), the client's own `Player.attack` doesn't (a mob's `hurtClient`
-    /// is false), and once the server's flag reaches it LocalPlayer.aiStep starts the sprint again
-    /// while the sprint key is held, with nothing to say: wasSprinting never changed.
-    pub sprinting: bool,
-    /// The attacks of the client tick being heard.
-    pub attacks: combat::Attacks,
-}
-
-impl Player {
-    /// The check's violation level at `tick`, with its decay since the last flag.
-    pub fn vl(&self, config: &Config, check: Check, tick: u64) -> f32 {
-        let i = check as usize;
-        let seconds = tick.saturating_sub(self.flagged[i]) as f32 / 20.0;
-        (self.vl[i] - config.actions(check).decay * seconds).max(0.0)
-    }
-
-    /// `check` failed with this weight at server tick `tick`.
-    pub fn flag(&mut self, config: &Config, check: Check, weight: f32, tick: u64) -> Verdict {
-        let i = check as usize;
-        let a = config.actions(check);
-        let vl = self.vl(config, check, tick) + weight;
-        self.vl[i] = vl;
-        self.flagged[i] = tick;
-        let reached = |threshold: f32| threshold > 0.0 && vl >= threshold;
-        let alert = reached(a.alert) && self.alerted[i].is_none_or(|t| tick >= t + 20);
-        if alert {
-            self.alerted[i] = Some(tick);
-        }
-        Verdict {
-            vl,
-            setback: reached(a.setback),
-            alert,
-            kick: reached(a.kick),
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    fn on() -> Config {
-        Config {
-            enabled: true,
-            ..Config::default()
-        }
-    }
-
-    #[test]
-    fn on_by_default_but_only_combat_and_ground_act() {
-        let c = Config::from_server_toml("[server]\nport = 25565\n").unwrap();
-        assert_eq!(c, Config::default());
-        for &check in Check::ALL {
-            assert!(c.runs(check), "{}", check.name());
-            let a = c.actions(check);
-            let acts = [a.setback, a.alert, a.kick] != [0.0; 3];
-            assert_eq!(
-                acts,
-                matches!(check, Check::Combat | Check::Ground),
-                "{}",
-                check.name()
-            );
-        }
-        let off = Config::from_server_toml("[anticheat]\nenabled = false\n").unwrap();
-        assert!(Check::ALL.iter().all(|&check| !off.runs(check)));
-    }
-
-    #[test]
-    fn reads_its_section() {
-        let text = "[server]\nport = 1\n[anticheat]\nenabled = true\n[anticheat.timer]\nkick = 0\ntolerance_ms = 500\n";
-        let c = Config::from_server_toml(text).unwrap();
-        assert!(c.runs(Check::Timer));
-        assert_eq!(c.timer.kick, 0.0);
-        assert_eq!(c.timer.tolerance_ms, 500.0);
-        assert_eq!(c.timer.alert, TimerConfig::default().alert);
-        let zero = "[anticheat]\n[anticheat.prediction]\ntolerance = 0\n";
-        assert!(Config::from_server_toml(zero).is_err());
-        let off = "[anticheat]\nenabled = true\n[anticheat.timer]\nenabled = false\n";
-        assert!(!Config::from_server_toml(off).unwrap().runs(Check::Timer));
-    }
-
-    #[test]
-    fn refuses_unknown_keys_and_negative_levels() {
-        assert!(Config::from_server_toml("[anticheat]\nenable = true\n").is_err());
-        assert!(Config::from_server_toml("[anticheat.timer]\nkick = -1\n").is_err());
-    }
-
-    #[test]
-    fn levels_rise_decay_and_act_in_order() {
-        let mut c = on();
-        c.timer = TimerConfig {
-            setback: 2.0,
-            alert: 3.0,
-            kick: 5.0,
-            decay: 1.0,
-            ..TimerConfig::default()
-        };
-        let mut p = Player::default();
-        let v = p.flag(&c, Check::Timer, 1.0, 100);
-        assert_eq!((v.setback, v.alert, v.kick), (false, false, false));
-        let v = p.flag(&c, Check::Timer, 1.0, 100);
-        assert_eq!((v.vl, v.setback, v.alert), (2.0, true, false));
-        let v = p.flag(&c, Check::Timer, 1.0, 100);
-        assert!(v.alert && !v.kick);
-        // At most one alert a second.
-        assert!(!p.flag(&c, Check::Timer, 0.5, 110).alert);
-        // 3 at tick 110 (half a level gone, half added); two seconds later two more are gone.
-        assert_eq!(p.vl(&c, Check::Timer, 150), 1.0);
-        assert_eq!(p.vl(&c, Check::Timer, 10_000), 0.0);
-        let v = p.flag(&c, Check::Timer, 5.0, 10_000);
-        assert!(v.kick && v.alert);
-    }
-
-    #[test]
-    fn the_kick_that_reaches_ban_after_bans() {
-        let c = Config::default();
-        assert_eq!(c.actions(Check::Combat).ban_after, 2);
-        assert_eq!(c.actions(Check::Prediction).ban_after, 0);
-        let mut s = Strikes::default();
-        assert_eq!(s.kick("a", Check::Combat, 2), (1, false));
-        // Another player, another check: their own counts.
-        assert_eq!(s.kick("b", Check::Combat, 2), (1, false));
-        assert_eq!(s.kick("a", Check::Timer, 2), (1, false));
-        assert_eq!(s.kick("a", Check::Combat, 2), (2, true));
-        // Pardoned, the player is kicked once more before the next ban.
-        assert_eq!(s.kick("a", Check::Combat, 2), (1, false));
-        // 0 never bans; 1 bans at the first kick.
-        assert_eq!(s.kick("c", Check::Timer, 0), (1, false));
-        assert_eq!(s.kick("c", Check::Timer, 0), (2, false));
-        assert_eq!(s.kick("d", Check::Ground, 1), (1, true));
-    }
-
-    #[test]
-    fn zero_turns_an_action_off() {
-        let mut c = on();
-        c.timer.kick = 0.0;
-        let mut p = Player::default();
-        assert!(!p.flag(&c, Check::Timer, 1000.0, 1).kick);
-    }
-}

crates/horizon-anticheat/src/prediction.rs

@@ -1,416 +0,0 @@
-//! The movement prediction's record: each of a player's client ticks as the server heard them, so
-//! the server can play the tick again with vanilla's movement code and compare (docs/anticheat.md).
-//!
-//! A vanilla client ends every tick with ServerboundClientTickEndPacket, after the tick's input
-//! (ServerboundPlayerInputPacket, sent when the keys change) and its move (ServerboundMovePlayerPacket,
-//! when it moved or turned). Those packets arrive in order, so the packets between two tick ends are one
-//! client tick.
-//!
-//! What the server changes about the player (a push, a teleport, an effect) takes effect on the client
-//! when it handles the packet, which is some client ticks after the server sent it. At the end of each of
-//! its ticks the server sends a ClientboundPingPacket whose id is that server tick; the client answers
-//! with ServerboundPongPacket as soon as it handles it, before its next tick runs. A client tick knows
-//! the last server tick it had handled: every change of that server tick or an earlier one was in effect
-//! during the client tick, none of a later one.
-
-use std::collections::VecDeque;
-
-/// Client ticks kept: two seconds at 20 a second.
-pub const KEPT: usize = 40;
-
-/// Server changes kept, the oldest dropped first.
-const CHANGES_KEPT: usize = 64;
-
-/// Changes near the player kept until every kept tick has seen them.
-const NEAR_KEPT: usize = 1024;
-
-/// Something the server sent the player that changes how its client moves. The client applies it when
-/// it handles the packet, before its next tick.
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub enum Change {
-    /// ClientboundSetEntityMotionPacket for the player itself: its new velocity, as the client
-    /// decodes it.
-    Velocity([f64; 3]),
-    /// ClientboundExplodePacket's player knockback, added to the velocity.
-    Knockback([f64; 3]),
-    /// ClientboundUpdateAttributesPacket for the player itself: the server's attributes as they
-    /// are when the replay reaches it, but for the movement speed's sprint modifier, which the
-    /// client's sprinting decides: `sprint` is whether the packet had it when it carried the
-    /// movement speed (the client takes the modifiers as sent, so a sprint modifier the packet
-    /// lacks is gone while the client sprints), None when it didn't (the client keeps its own).
-    Attributes { sprint: Option<bool> },
-    /// ClientboundSetEntityDataPacket for the player itself with its shared flags: their sprinting
-    /// bit, which the client takes as sent (SynchedEntityData.assignValues sets the flag alone, its
-    /// speed modifier and wasSprinting stay). A client whose sprint the server cleared this way
-    /// starts it again in its next aiStep, which adds the modifier back, and says nothing.
-    Sprinting(bool),
-    /// ClientboundUpdateMobEffectPacket or ClientboundRemoveMobEffectPacket for the player itself:
-    /// the server's effects, as they are when the replay reaches it. (Their attribute modifiers
-    /// are the server's: they reach the client as attributes.)
-    Effects,
-    /// ClientboundPlayerAbilitiesPacket (a game mode, flight given or taken), or the player's chest
-    /// slot (a glider put on or taken off): the replay takes these from the server every tick, so a
-    /// tick played before the client had them may be off.
-    Abilities,
-}
-
-/// A teleport the client accepted: the replay starts again from it.
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub struct Restart {
-    /// Where it put the player.
-    pub at: [f64; 3],
-    /// It kept the player's motion (an End gateway's).
-    pub kept_motion: bool,
-    /// Client ticks ended and changes heard before it: the ones after are the replay's.
-    pub ended: u64,
-    pub changed: u64,
-}
-
-/// One client tick.
-#[derive(Clone, Copy, Debug, Default, PartialEq)]
-pub struct ClientTick {
-    /// The keys held (ServerboundPlayerInputPacket's flags: forward, backward, left, right, jump,
-    /// shift, sprint), as last sent.
-    pub input: u8,
-    /// Sprinting, as the player's commands left it (ServerboundPlayerCommandPacket).
-    pub sprinting: bool,
-    /// The rotation the client last sent.
-    pub yaw: f32,
-    pub pitch: f32,
-    /// Where the tick's move said the player is, if it said: a move with a position.
-    pub position: Option<[f64; 3]>,
-    /// The tick's move packet's flags (1: on the ground, 2: against a wall), if it sent one.
-    pub flags: Option<u8>,
-    /// The last server tick whose packets the client had handled (its pong) before this tick ended.
-    pub seen: Option<u64>,
-}
-
-/// A player's last client ticks.
-#[derive(Clone, Debug, Default)]
-pub struct Record {
-    /// The tick being heard.
-    current: ClientTick,
-    /// The ended ones, oldest first, at most [`KEPT`].
-    ticks: VecDeque<ClientTick>,
-    /// The last server tick the client answered for.
-    seen: Option<u64>,
-    /// Client ticks ended since the record began.
-    ended: u64,
-    /// Where an accepted teleport put the player, until the replay starts again from there.
-    restart: Option<Restart>,
-    /// What the server changed, with the server tick that sent it, oldest first.
-    changes: VecDeque<(u64, Change)>,
-    /// Changes heard since the record began.
-    changed: u64,
-    /// The blocks the server changed near the player (None: an entity it stopped showing the player
-    /// from near it, which counts wherever the player has gone since), with the server tick that sent
-    /// each, until every kept tick has seen them.
-    near: VecDeque<(u64, Option<[i32; 3]>)>,
-    /// The server tick of the last of them dropped early ([`NEAR_KEPT`] came after it).
-    near_dropped: Option<u64>,
-}
-
-impl Record {
-    /// The tick's move: its position if it has one, the rotation if it has one, and its flags.
-    pub fn moved(&mut self, position: Option<[f64; 3]>, rotation: Option<(f32, f32)>, flags: u8) {
-        if position.is_some() {
-            self.current.position = position;
-        }
-        if let Some((yaw, pitch)) = rotation {
-            (self.current.yaw, self.current.pitch) = (yaw, pitch);
-        }
-        self.current.flags = Some(flags);
-    }
-
-    /// ServerboundPongPacket for the ping sent at the end of `server_tick`. False for an answer to a
-    /// ping that was never sent, or one older than an answer already heard: a vanilla client answers
-    /// every ping, once, in order.
-    pub fn pong(&mut self, server_tick: u64, sent_up_to: u64) -> bool {
-        if server_tick > sent_up_to || self.seen.is_some_and(|seen| server_tick <= seen) {
-            return false;
-        }
-        self.seen = Some(server_tick);
-        true
-    }
-
-    /// ServerboundClientTickEndPacket: the tick ends with these keys held and this sprinting. The
-    /// next tick starts with the same keys and rotation, until the client says otherwise.
-    pub fn tick_end(&mut self, input: u8, sprinting: bool) -> &ClientTick {
-        self.current.input = input;
-        self.current.sprinting = sprinting;
-        self.current.seen = self.seen;
-        let next = ClientTick {
-            yaw: self.current.yaw,
-            pitch: self.current.pitch,
-            ..ClientTick::default()
-        };
-        let ended = std::mem::replace(&mut self.current, next);
-        if self.ticks.len() == KEPT {
-            self.ticks.pop_front();
-        }
-        self.ticks.push_back(ended);
-        self.ended += 1;
-        // What the oldest tick kept had seen, every later one had too.
-        if let Some(seen) = self.ticks.front().and_then(|t| t.seen) {
-            while self.near.front().is_some_and(|&(sent, _)| sent <= seen) {
-                self.near.pop_front();
-            }
-            self.near_dropped = self.near_dropped.filter(|&sent| sent > seen);
-        }
-        self.ticks.back().expect("just pushed")
-    }
-
-    /// The ended ticks, oldest first.
-    pub fn ticks(&self) -> impl DoubleEndedIterator<Item = &ClientTick> + ExactSizeIterator {
-        self.ticks.iter()
-    }
-
-    /// The last server tick the client answered for.
-    pub fn seen(&self) -> Option<u64> {
-        self.seen
-    }
-
-    /// Client ticks ended since the record began.
-    pub fn ended(&self) -> u64 {
-        self.ended
-    }
-
-    /// The ticks ended after the first `played`, oldest first; None when some of them are no longer
-    /// kept.
-    pub fn since(&self, played: u64) -> Option<impl Iterator<Item = &ClientTick>> {
-        let new = self.ended.checked_sub(played)?;
-        let new = usize::try_from(new)
-            .ok()
-            .filter(|&n| n <= self.ticks.len())?;
-        Some(self.ticks.iter().skip(self.ticks.len() - new))
-    }
-
-    /// `change`, sent during server tick `server_tick` (before that tick's ping).
-    pub fn changed(&mut self, server_tick: u64, change: Change) {
-        if self.changes.len() == CHANGES_KEPT {
-            self.changes.pop_front();
-        }
-        self.changes.push_back((server_tick, change));
-        self.changed += 1;
-    }
-
-    /// Changes heard since the record began.
-    pub fn changes(&self) -> u64 {
-        self.changed
-    }
-
-    /// The changes after the first `applied`, oldest first; None when some of them are no longer kept.
-    pub fn changes_since(
-        &self,
-        applied: u64,
-    ) -> Option<impl Iterator<Item = &(u64, Change)> + Clone> {
-        let new = self.changed.checked_sub(applied)?;
-        let new = usize::try_from(new)
-            .ok()
-            .filter(|&n| n <= self.changes.len())?;
-        Some(self.changes.iter().skip(self.changes.len() - new))
-    }
-
-    /// During server tick `server_tick` (before that tick's ping) the server sent the client the block
-    /// at `pos`.
-    pub fn changed_near(&mut self, server_tick: u64, pos: [i32; 3]) {
-        self.note_near(server_tick, Some(pos));
-    }
-
-    /// During server tick `server_tick` the server stopped showing the client an entity near it (a
-    /// firework it flew with, a mob that pushed it): the client may still have it, wherever it goes.
-    pub fn entity_gone(&mut self, server_tick: u64) {
-        if self.near.back() != Some(&(server_tick, None)) {
-            self.note_near(server_tick, None);
-        }
-    }
-
-    fn note_near(&mut self, server_tick: u64, pos: Option<[i32; 3]>) {
-        if self.near.len() == NEAR_KEPT {
-            self.near_dropped = self.near.pop_front().map(|(sent, _)| sent);
-        }
-        self.near.push_back((server_tick, pos));
-    }
-
-    /// Whether a client tick that had `seen` up to that server tick (its [`ClientTick::seen`]) may
-    /// not have had a change at a position for which `near` holds: it still had the old block, or the
-    /// entity, where the server no longer has it.
-    pub fn unseen_near(&self, seen: Option<u64>, near: impl Fn([i32; 3]) -> bool) -> bool {
-        let unseen = |sent: u64| seen.is_none_or(|seen| sent > seen);
-        self.near_dropped.is_some_and(unseen)
-            || self
-                .near
-                .iter()
-                .any(|&(sent, pos)| unseen(sent) && pos.is_none_or(&near))
-    }
-
-    /// The client accepted a teleport to `at` (ServerboundAcceptTeleportationPacket): it goes on from
-    /// there, standing still unless the teleport `kept_motion` (an End gateway's). The ticks it ended
-    /// before stay, for a replay that hasn't played them yet; the one under way starts again.
-    pub fn teleported(&mut self, at: [f64; 3], kept_motion: bool) {
-        self.restart_tick();
-        self.restart = Some(Restart {
-            at,
-            kept_motion,
-            ended: self.ended,
-            changed: self.changed,
-        });
-    }
-
-    /// The last teleport the client accepted, once.
-    pub fn take_restart(&mut self) -> Option<Restart> {
-        self.restart.take()
-    }
-
-    /// The ticks before now say nothing about the ones after.
-    pub fn clear(&mut self) {
-        self.ticks.clear();
-        self.restart_tick();
-    }
-
-    fn restart_tick(&mut self) {
-        self.current = ClientTick {
-            yaw: self.current.yaw,
-            pitch: self.current.pitch,
-            ..ClientTick::default()
-        };
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn a_change_near_is_unseen_by_the_ticks_before_its_pong() {
-        let mut r = Record::default();
-        r.changed_near(4, [1, 2, 3]);
-        r.changed_near(5, [7, 2, 3]);
-        let near = |p: [i32; 3]| p[0] < 5;
-        assert!(r.unseen_near(None, near));
-        assert!(r.unseen_near(Some(3), near));
-        assert!(!r.unseen_near(Some(4), near));
-        assert!(r.unseen_near(Some(4), |_| true));
-        // Kept until the oldest tick kept had seen it: one that ended before the pong hadn't.
-        r.tick_end(0, false);
-        assert!(r.pong(5, 5));
-        r.tick_end(0, false);
-        assert!(r.unseen_near(Some(3), near));
-        for _ in 0..KEPT {
-            r.tick_end(0, false);
-        }
-        assert!(!r.unseen_near(None, |_| true));
-        // An entity gone counts anywhere.
-        r.entity_gone(5);
-        r.entity_gone(5);
-        assert!(r.unseen_near(Some(4), |_| false));
-        assert!(!r.unseen_near(Some(5), |_| false));
-        // One dropped early counts for the ticks that hadn't seen it.
-        for i in 0..=NEAR_KEPT as u64 {
-            r.changed_near(6 + i, [100, 0, 0]);
-        }
-        assert!(
-            r.unseen_near(Some(5), near),
-            "a change dropped unseen counts"
-        );
-        assert!(!r.unseen_near(Some(6), near));
-    }
-
-    #[test]
-    fn a_tick_is_the_packets_between_two_tick_ends() {
-        let mut r = Record::default();
-        r.moved(Some([1.0, 2.0, 3.0]), Some((90.0, 10.0)), 1);
-        let t = *r.tick_end(0b1001, true);
-        assert_eq!(t.position, Some([1.0, 2.0, 3.0]));
-        assert_eq!((t.yaw, t.pitch, t.flags), (90.0, 10.0, Some(1)));
-        assert_eq!((t.input, t.sprinting, t.seen), (0b1001, true, None));
-        // A tick without a move keeps the rotation and has no position.
-        let t = *r.tick_end(0, false);
-        assert_eq!((t.position, t.flags, t.yaw), (None, None, 90.0));
-        assert_eq!(r.ticks().len(), 2);
-    }
-
-    #[test]
-    fn pongs_say_which_server_ticks_a_client_tick_had_seen() {
-        let mut r = Record::default();
-        assert!(r.pong(5, 6));
-        r.tick_end(0, false);
-        assert!(r.pong(6, 6));
-        r.tick_end(0, false);
-        r.tick_end(0, false);
-        let seen: Vec<_> = r.ticks().map(|t| t.seen).collect();
-        assert_eq!(seen, [Some(5), Some(6), Some(6)]);
-        // Never sent, answered twice, or out of order.
-        assert!(!r.pong(9, 6));
-        assert!(!r.pong(6, 6));
-        assert!(!r.pong(4, 6));
-        assert_eq!(r.seen(), Some(6));
-    }
-
-    #[test]
-    fn only_the_last_two_seconds_are_kept() {
-        let mut r = Record::default();
-        for i in 0..KEPT + 5 {
-            r.moved(Some([i as f64, 0.0, 0.0]), None, 0);
-            r.tick_end(0, false);
-        }
-        assert_eq!(r.ticks().len(), KEPT);
-        assert_eq!(r.ticks().next().unwrap().position, Some([5.0, 0.0, 0.0]));
-        r.clear();
-        assert_eq!(r.ticks().len(), 0);
-    }
-
-    #[test]
-    fn the_replay_takes_the_ticks_it_has_not_played() {
-        let mut r = Record::default();
-        for i in 0..3 {
-            r.moved(Some([i as f64, 0.0, 0.0]), None, 0);
-            r.tick_end(0, false);
-        }
-        fn x(r: &Record, played: u64) -> Option<Vec<f64>> {
-            r.since(played)
-                .map(|t| t.map(|t| t.position.unwrap()[0]).collect())
-        }
-        assert_eq!(x(&r, 1), Some(vec![1.0, 2.0]));
-        assert_eq!(x(&r, 3), Some(vec![]));
-        // Played ahead of the record, or so far behind the ticks are gone.
-        assert_eq!(x(&r, 4), None);
-        r.clear();
-        assert_eq!(x(&r, 2), None);
-        assert_eq!(x(&r, 3), Some(vec![]));
-        r.moved(Some([8.0, 0.0, 0.0]), None, 0);
-        r.tick_end(0, false);
-        r.moved(Some([9.0, 0.0, 0.0]), None, 0);
-        r.teleported([5.0, 6.0, 7.0], false);
-        // A tick that ends before the replay starts again is still one after the teleport.
-        r.tick_end(0, false);
-        let restart = r.take_restart().unwrap();
-        assert_eq!((restart.at, restart.kept_motion), ([5.0, 6.0, 7.0], false));
-        assert_eq!(r.since(restart.ended).unwrap().count(), 1);
-        // The tick ended before it stays for a replay that hasn't played it; the move of the one
-        // under way is gone.
-        let positions: Vec<_> = r.since(3).unwrap().map(|t| t.position).collect();
-        assert_eq!(positions, [Some([8.0, 0.0, 0.0]), None]);
-        assert_eq!(r.take_restart(), None);
-    }
-
-    #[test]
-    fn changes_keep_the_server_tick_that_sent_them() {
-        let mut r = Record::default();
-        r.changed(3, Change::Velocity([0.0, 0.4, 0.0]));
-        r.changed(5, Change::Effects);
-        let all: Vec<_> = r.changes_since(0).unwrap().copied().collect();
-        assert_eq!(
-            all,
-            [(3, Change::Velocity([0.0, 0.4, 0.0])), (5, Change::Effects)]
-        );
-        assert_eq!(r.changes_since(1).unwrap().count(), 1);
-        assert!(r.changes_since(3).is_none());
-        for i in 0..CHANGES_KEPT as u64 {
-            r.changed(6 + i, Change::Effects);
-        }
-        // The first two are gone.
-        assert!(r.changes_since(1).is_none());
-        assert_eq!(r.changes_since(2).unwrap().count(), CHANGES_KEPT);
-    }
-}

crates/horizon-anticheat/src/timer.rs

@@ -1,111 +0,0 @@
-//! The timer check's balance: how far a client's ticks are behind (positive) or ahead (negative) of the
-//! server's clock, in milliseconds.
-//!
-//! The server adds the wall-clock time of each of its ticks, and every ServerboundClientTickEndPacket
-//! takes away the length of one tick at the server's tick rate (vanilla's client ticks at that rate,
-//! `TickRateManager.millisecondsPerTick`). The balance is capped at `max_lag_ms` *after* the tick's
-//! packets are counted: a slow server tick that handles a second of packets at once also added that
-//! second, and a quiet connection banks at most `max_lag_ms` for the burst that ends a lag spike.
-
-use crate::TimerConfig;
-
-#[derive(Clone, Debug, Default)]
-pub struct Balance {
-    pub ms: f64,
-}
-
-impl Balance {
-    /// The start of a server tick that came `elapsed_ms` after the previous one.
-    pub fn elapse(&mut self, elapsed_ms: f64, config: &TimerConfig) {
-        self.ms = self.ms.min(config.max_lag_ms) + elapsed_ms;
-    }
-
-    /// One client tick ended, at a tick rate of `tick_rate` a second. Some(how far ahead, in ms) when the
-    /// client is further ahead than the tolerance; the balance starts again from zero then, so a
-    /// sustained speed-up is flagged again each time it gets that far ahead.
-    pub fn tick_end(&mut self, tick_rate: f32, config: &TimerConfig) -> Option<f64> {
-        self.ms -= 1000.0 / f64::from(tick_rate.max(1.0));
-        if self.ms < -config.tolerance_ms {
-            let ahead = -self.ms;
-            self.ms = 0.0;
-            return Some(ahead);
-        }
-        None
-    }
-
-    /// The tick rate changed or the player arrived: start again.
-    pub fn reset(&mut self) {
-        self.ms = 0.0;
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    /// `seconds` of server ticks of `server_ms` each, with `per_tick` client ticks handled in each.
-    fn run(b: &mut Balance, server_ms: f64, per_tick: f64, seconds: f64) -> usize {
-        let c = TimerConfig::default();
-        let mut owed = 0.0;
-        let mut flags = 0;
-        for _ in 0..(seconds * 1000.0 / server_ms) as usize {
-            b.elapse(server_ms, &c);
-            owed += per_tick;
-            while owed >= 1.0 {
-                owed -= 1.0;
-                flags += usize::from(b.tick_end(20.0, &c).is_some());
-            }
-        }
-        flags
-    }
-
-    #[test]
-    fn a_vanilla_client_is_never_flagged() {
-        let mut b = Balance::default();
-        assert_eq!(run(&mut b, 50.0, 1.0, 600.0), 0);
-        // A server that runs at 10 ticks a second handles two client ticks in each.
-        assert_eq!(run(&mut b, 100.0, 2.0, 600.0), 0);
-    }
-
-    #[test]
-    fn a_slow_server_tick_with_its_backlog_is_not_flagged() {
-        let (mut b, c) = (Balance::default(), TimerConfig::default());
-        b.elapse(3000.0, &c);
-        for _ in 0..60 {
-            assert_eq!(b.tick_end(20.0, &c), None);
-        }
-    }
-
-    #[test]
-    fn a_short_network_stall_is_not_flagged() {
-        let (mut b, c) = (Balance::default(), TimerConfig::default());
-        // 800 ms with nothing arriving, then the 16 ticks sent meanwhile.
-        for _ in 0..16 {
-            b.elapse(50.0, &c);
-        }
-        b.elapse(50.0, &c);
-        for _ in 0..17 {
-            assert_eq!(b.tick_end(20.0, &c), None);
-        }
-    }
-
-    #[test]
-    fn a_sped_up_client_is_flagged_again_and_again() {
-        let mut b = Balance::default();
-        // 10 % faster: 5 ms ahead each tick, 300 ms after 3 s, so close to 20 flags a minute.
-        let flags = run(&mut b, 50.0, 1.1, 60.0);
-        assert!((15..=20).contains(&flags), "{flags}");
-        // Twice as fast: a flag every 7 ticks.
-        assert!(run(&mut Balance::default(), 50.0, 2.0, 10.0) >= 25);
-    }
-
-    #[test]
-    fn a_pause_cant_be_saved_for_a_burst() {
-        let (mut b, c) = (Balance::default(), TimerConfig::default());
-        for _ in 0..200 {
-            b.elapse(50.0, &c);
-        }
-        let flagged = (0..60).any(|_| b.tick_end(20.0, &c).is_some());
-        assert!(flagged);
-    }
-}

crates/horizon-assets/Cargo.toml

@@ -8,7 +8,6 @@ description = "Horizon version-specific model and resource decoding"
 
 [dependencies]
 horizon-core = { path = "../horizon-core" }
-log = "0.4"
 serde = "1.0.229"
 serde_json = { version = "1.0.151", features = ["raw_value"] }
 

crates/horizon-assets/src/bake.rs

@@ -1,10 +1,5 @@
 //! Cuboid geometry in block units, including blockstate rotation and UV locking.
-use crate::{
-    json::*,
-    model::*,
-    obj::{MtlTexture, ObjFace, ObjModel},
-    resolve::{ResolvedCuboidModel, ResolvedLoader},
-};
+use crate::{json::*, model::*, resolve::ResolvedCuboidModel};
 mod transform;
 pub use transform::BlockModelTransform;
 
@@ -18,40 +13,7 @@ pub struct ModelQuad {
     pub material: Material,
     pub tint_index: i32,
     pub shade_direction_override: Option<Direction>,
-    /// The face's or element's `light_emission`.
     pub light_emission: u8,
-    /// Least (block, sky) light the quad is drawn with: its emission, raised by `neoforge_data`.
-    pub light: [u8; 2],
-    /// `neoforge_data` colour (ARGB) multiplied into the quad's tint.
-    pub color: Option<i32>,
-    /// `neoforge_data` override of the model's ambient occlusion for this quad.
-    pub ambient_occlusion: Option<bool>,
-    pub render_type: Option<RenderType>,
-    /// False for a loader quad that takes no directional shading.
-    pub shade: bool,
-}
-
-/// NeoForge's `render_type` names.
-#[derive(Clone, Copy, Debug, PartialEq, Eq)]
-pub enum RenderType {
-    Solid,
-    Cutout,
-    CutoutMipped,
-    Translucent,
-    Tripwire,
-}
-impl RenderType {
-    /// Accepts a bare or `minecraft:` name; others (mods' own types) are `None`.
-    pub fn by_name(name: &str) -> Option<Self> {
-        match name.strip_prefix("minecraft:").unwrap_or(name) {
-            "solid" => Some(Self::Solid),
-            "cutout" => Some(Self::Cutout),
-            "cutout_mipped" => Some(Self::CutoutMipped),
-            "translucent" => Some(Self::Translucent),
-            "tripwire" => Some(Self::Tripwire),
-            _ => None,
-        }
-    }
 }
 
 #[derive(Clone, Copy, Debug)]
@@ -224,17 +186,6 @@ fn bake_elements(
     skip_flat: bool,
 ) -> Result<Vec<ModelQuad>> {
     let mut output = Vec::new();
-    bake_into(model, transform, skip_flat, &mut output)?;
-    Ok(output)
-}
-/// The elements, then what the model's loader adds.
-fn bake_into(
-    model: &ResolvedCuboidModel,
-    transform: BlockModelTransform,
-    skip_flat: bool,
-    output: &mut Vec<ModelQuad>,
-) -> Result<()> {
-    let render_type = model.render_type.as_deref().and_then(RenderType::by_name);
     for element in model.elements() {
         let element = element
             .as_ref()
@@ -256,108 +207,11 @@ fn bake_into(
                 force_translucent: false,
             });
             output.push(bake_face(
-                element,
-                face,
-                *direction,
-                matrix,
-                material,
-                transform,
-                render_type,
+                element, face, *direction, matrix, material, transform,
             )?);
         }
     }
-    match model.loader() {
-        Some(ResolvedLoader::Composite(children)) => {
-            for child in children {
-                bake_into(child, transform, skip_flat, output)?;
-            }
-        }
-        Some(ResolvedLoader::Obj {
-            model: Some(obj),
-            flip_v,
-            shade,
-            hidden,
-        }) => bake_obj(model, obj, *flip_v, *shade, hidden, transform, output)?,
-        Some(ResolvedLoader::Obj { model: None, .. }) | None => {}
-    }
-    Ok(())
-}
-/// Obj faces are unculled quads in block units; the blockstate transform moves them whole.
-fn bake_obj(
-    model: &ResolvedCuboidModel,
-    obj: &ObjModel,
-    flip_v: bool,
-    shade: bool,
-    hidden: &std::collections::BTreeSet<String>,
-    transform: BlockModelTransform,
-    output: &mut Vec<ModelQuad>,
-) -> Result<()> {
-    let render_type = model.render_type.as_deref().and_then(RenderType::by_name);
-    for face in obj.faces.iter().filter(|f| !hidden.contains(&f.object)) {
-        let slot = match obj.materials.get(&face.material) {
-            Some(MtlTexture::Sprite(sprite)) => {
-                output.push(obj_quad(
-                    face,
-                    Material {
-                        sprite: identifier(sprite)?,
-                        force_translucent: false,
-                    },
-                    flip_v,
-                    shade,
-                    render_type,
-                    transform,
-                ));
-                continue;
-            }
-            Some(MtlTexture::Slot(slot)) => slot,
-            None => &face.material,
-        };
-        let material = if slot.is_empty() {
-            None
-        } else {
-            model.material(slot)?
-        };
-        let material = material.cloned().unwrap_or(Material {
-            sprite: "minecraft:missingno".to_owned(),
-            force_translucent: false,
-        });
-        output.push(obj_quad(
-            face,
-            material,
-            flip_v,
-            shade,
-            render_type,
-            transform,
-        ));
-    }
-    Ok(())
-}
-fn obj_quad(
-    face: &ObjFace,
-    material: Material,
-    flip_v: bool,
-    shade: bool,
-    render_type: Option<RenderType>,
-    transform: BlockModelTransform,
-) -> ModelQuad {
-    let positions = face.vertices.map(|v| transform.position(v.position));
-    ModelQuad {
-        positions,
-        uv: face
-            .vertices
-            .map(|v| [v.uv[0], if flip_v { 1.0 - v.uv[1] } else { v.uv[1] }]),
-        facing: facing(&positions).unwrap_or(Direction::Up),
-        cull: None,
-        material,
-        tint_index: -1,
-        shade_direction_override: None,
-        light_emission: 0,
-        light: [0; 2],
-        color: None,
-        ambient_occlusion: None,
-        render_type,
-        shade,
-    }
+    Ok(output)
 }
 /// `FaceBakery.bakeQuad` for a quad with explicit corners and unit-atlas UVs
 /// (`uv` in 0..16 texels), as `ItemModelGenerator` builds its layers.
@@ -376,7 +230,6 @@ pub fn bake_flat_face(
         rotation: None,
         shade_direction_override: None,
         light_emission: 0,
-        neoforge_data: None,
     };
     let face = Face {
         cull: None,
@@ -384,8 +237,6 @@ pub fn bake_flat_face(
         texture: String::new(),
         uv: Some(uv),
         rotation: 0,
-        light_emission: None,
-        neoforge_data: None,
     };
     bake_face(
         &element,
@@ -394,7 +245,6 @@ pub fn bake_flat_face(
         None,
         material,
         BlockModelTransform::new([0; 3], false),
-        None,
     )
 }
 fn bake_face(
@@ -404,7 +254,6 @@ fn bake_face(
     matrix: Option<ElementMatrix>,
     material: Material,
     transform: BlockModelTransform,
-    render_type: Option<RenderType>,
 ) -> Result<ModelQuad> {
     let mut positions = corners(element.from, element.to, direction).map(|v| v.map(|c| c / 16.0));
     if let (Some(rotation), Some(matrix)) = (&element.rotation, matrix) {
@@ -454,11 +303,6 @@ fn bake_face(
             uv.swap(index, found);
         }
     }
-    let data = face
-        .neoforge_data
-        .unwrap_or_default()
-        .over(element.neoforge_data.unwrap_or_default());
-    let light_emission = face.light_emission.unwrap_or(element.light_emission);
     Ok(ModelQuad {
         positions,
         uv,
@@ -467,196 +311,6 @@ fn bake_face(
         material,
         tint_index: face.tint_index,
         shade_direction_override: element.shade_direction_override,
-        light_emission,
-        light: [data.block_light, data.sky_light].map(|l| l.unwrap_or(0).max(light_emission)),
-        color: data.color,
-        ambient_occlusion: data.ambient_occlusion,
-        render_type,
-        shade: true,
+        light_emission: element.light_emission,
     })
 }
-
-#[cfg(test)]
-mod loader_tests {
-    use super::*;
-    use crate::resolve::{AssetReader, ModelLibrary};
-    use std::{collections::BTreeMap, sync::Arc};
-
-    struct Files(BTreeMap<&'static str, &'static str>);
-    impl AssetReader for Files {
-        fn read_text(&self, location: &str) -> Option<String> {
-            self.0.get(location).map(|text| (*text).to_owned())
-        }
-    }
-
-    fn library(models: &[(&str, &str)], files: &[(&'static str, &'static str)]) -> ModelLibrary {
-        let models = models
-            .iter()
-            .map(|(name, json)| ((*name).to_owned(), CuboidModel::from_json(json).unwrap()))
-            .collect();
-        ModelLibrary::new(models)
-            .unwrap()
-            .with_assets(Arc::new(Files(files.iter().copied().collect())))
-    }
-    fn bake(library: &ModelLibrary, name: &str) -> Vec<ModelQuad> {
-        bake_block_model(
-            &library.resolve(name).unwrap(),
-            BlockModelTransform::new([0; 3], false),
-        )
-        .unwrap()
-    }
-    fn sprites(quads: &[ModelQuad]) -> Vec<&str> {
-        quads.iter().map(|q| q.material.sprite.as_str()).collect()
-    }
-    const CUBE: &str =
-        r##"{"elements":[{"from":[0,0,0],"to":[16,16,16],"faces":{"up":{"texture":"#all"}}}]}"##;
-    const COMPOSITE: &str = r#"{"loader":"neoforge:composite","textures":{"all":"block/shared"},
-        "children":{"zeta":{"parent":"t:cube","textures":{"all":"block/own"}},"alpha":{"parent":"t:cube"}}}"#;
-
-    #[test]
-    fn composite_bakes_children_in_document_order_with_slot_fallback() {
-        let library = library(&[("t:cube", CUBE), ("t:comp", COMPOSITE)], &[]);
-        let quads = bake(&library, "t:comp");
-        assert_eq!(
-            sprites(&quads),
-            ["minecraft:block/own", "minecraft:block/shared"]
-        );
-    }
-    #[test]
-    fn composite_visibility_hides_a_child() {
-        let hidden =
-            COMPOSITE.replace(r#""children""#, r#""visibility":{"zeta":false},"children""#);
-        let library = library(&[("t:cube", CUBE), ("t:comp", &hidden)], &[]);
-        assert_eq!(
-            sprites(&bake(&library, "t:comp")),
-            ["minecraft:block/shared"]
-        );
-    }
-    #[test]
-    fn an_inheriting_model_overrides_which_children_are_visible() {
-        let hidden =
-            COMPOSITE.replace(r#""children""#, r#""visibility":{"zeta":false},"children""#);
-        let shown = r#"{"parent":"t:hidden","visibility":{"zeta":true,"alpha":false}}"#;
-        let library = library(
-            &[("t:cube", CUBE), ("t:hidden", &hidden), ("t:shown", shown)],
-            &[],
-        );
-        assert_eq!(sprites(&bake(&library, "t:shown")), ["minecraft:block/own"]);
-    }
-    #[test]
-    fn loader_is_inherited_by_parent_after_own_elements() {
-        let derived = r##"{"parent":"t:comp","textures":{"all":"block/derived"},
-            "elements":[{"from":[0,0,0],"to":[16,16,16],"faces":{"down":{"texture":"#all"}}}]}"##;
-        let library = library(
-            &[
-                ("t:cube", CUBE),
-                ("t:comp", COMPOSITE),
-                ("t:derived", derived),
-            ],
-            &[],
-        );
-        let quads = bake(&library, "t:derived");
-        assert_eq!(quads[0].facing, Direction::Down);
-        assert_eq!(
-            sprites(&quads),
-            [
-                "minecraft:block/derived",
-                "minecraft:block/own",
-                "minecraft:block/derived"
-            ]
-        );
-    }
-    #[test]
-    fn own_loader_wins_and_unknown_loader_adds_nothing() {
-        let other = r#"{"parent":"t:comp","loader":"somemod:thing"}"#;
-        let library = library(
-            &[("t:cube", CUBE), ("t:comp", COMPOSITE), ("t:other", other)],
-            &[],
-        );
-        assert!(bake(&library, "t:other").is_empty());
-    }
-    #[test]
-    fn composites_that_nest_through_themselves_are_an_error() {
-        let looping = r#"{"loader":"neoforge:composite","children":{"a":{"parent":"t:loop"}}}"#;
-        let library = library(&[("t:loop", looping)], &[]);
-        assert!(library.resolve("t:loop").is_err());
-    }
-
-    const OBJ: &str = "mtllib m.mtl\nv 0 0 0\nv 1 0 0\nv 1 0 1\nv 0 0 1\nv 0 1 0\n\
-        vt 0 0\nvt 1 0\nvt 1 1\nvt 0 1\n\
-        usemtl top\nf 1/1 4/4 3/3 2/2\nusemtl side\nf 1/1 2/2 5/4\nusemtl bare\nf 1/1 2/2 5/4\n";
-    const MTL: &str = "newmtl top\nmap_Kd #lid\nnewmtl side\nmap_Kd #wall\nnewmtl bare\nKd 1 1 1\n";
-    const OBJ_FILES: [(&str, &str); 2] = [("t:models/x.obj", OBJ), ("t:models/m.mtl", MTL)];
-    const OBJ_MODEL: &str = r#"{"loader":"neoforge:obj","model":"t:models/x.obj","flip_v":true,
-        "textures":{"lid":"block/lid","wall":"block/wall"}}"#;
-
-    #[test]
-    fn obj_faces_become_quads_with_materials_and_flipped_v() {
-        let flat = OBJ_MODEL.replace(r#""flip_v":true,"#, "");
-        let library = library(&[("t:o", OBJ_MODEL), ("t:flat", &flat)], &OBJ_FILES);
-        let quads = bake(&library, "t:o");
-        assert_eq!(
-            sprites(&quads),
-            [
-                "minecraft:block/lid",
-                "minecraft:block/wall",
-                "minecraft:missingno"
-            ]
-        );
-        assert_eq!(quads[0].facing, Direction::Up);
-        assert_eq!(quads[1].facing, Direction::South);
-        assert_eq!(quads[0].positions[1], [0.0, 0.0, 1.0]);
-        assert_eq!(quads[0].uv[0], [0.0, 1.0]);
-        assert_eq!(quads[0].uv[2], [1.0, 0.0]);
-        // A triangle repeats its last vertex.
-        assert_eq!(quads[1].positions[3], quads[1].positions[2]);
-        assert_eq!(quads[1].uv[3], quads[1].uv[2]);
-        assert!(quads.iter().all(|q| q.cull.is_none() && q.shade));
-        assert_eq!(bake(&library, "t:flat")[0].uv[0], [0.0, 0.0]);
-    }
-    #[test]
-    fn obj_shade_quads_false_and_mtl_override() {
-        let unshaded = r#"{"loader":"neoforge:obj","model":"t:models/x.obj","shade_quads":false,
-            "mtl_override":"t:models/o.mtl","textures":{"s":"block/s"}}"#;
-        let files = [
-            ("t:models/x.obj", OBJ),
-            ("t:models/o.mtl", "newmtl top\nmap_Kd #s\n"),
-        ];
-        let library = library(&[("t:u", unshaded)], &files);
-        let quads = bake(&library, "t:u");
-        assert!(quads.iter().all(|q| !q.shade));
-        assert_eq!(quads[0].material.sprite, "minecraft:block/s");
-    }
-    #[test]
-    fn missing_or_broken_obj_bakes_nothing() {
-        let missing = library(&[("t:o", OBJ_MODEL)], &[]);
-        assert!(bake(&missing, "t:o").is_empty());
-        let broken = library(
-            &[("t:o", OBJ_MODEL)],
-            &[("t:models/x.obj", "v 0 0 0\nf 1 2 3\n")],
-        );
-        assert!(bake(&broken, "t:o").is_empty());
-    }
-    #[test]
-    fn obj_visibility_skips_the_objects_a_model_hides() {
-        let two = "v 0 0 0\nv 1 0 0\nv 1 0 1\nv 0 0 1\no a\nusemtl m\nf 1 2 3 4\no b\nf 4 3 2 1\n";
-        let files = [("t:models/two.obj", two)];
-        let base =
-            r#"{"loader":"neoforge:obj","model":"t:models/two.obj","textures":{"m":"block/m"}}"#;
-        let hiding = r#"{"parent":"t:base","visibility":{"b":false}}"#;
-        let restoring = r#"{"parent":"t:hiding","visibility":{"b":true}}"#;
-        let library = library(
-            &[
-                ("t:base", base),
-                ("t:hiding", hiding),
-                ("t:restoring", restoring),
-            ],
-            &files,
-        );
-        assert_eq!(bake(&library, "t:base").len(), 2);
-        let quads = bake(&library, "t:hiding");
-        assert_eq!(quads.len(), 1);
-        assert_eq!(quads[0].facing, Direction::Down);
-        assert_eq!(bake(&library, "t:restoring").len(), 2);
-    }
-}

crates/horizon-assets/src/item_bake.rs

@@ -7,7 +7,7 @@ use crate::{
     json::Result,
     math::{Mat4, quaternion_xyz},
     model::{Direction, DisplayTransform, GuiLight, ItemTransform, Material},
-    resolve::{ModelLibrary, ResolvedCuboidModel},
+    resolve::ModelLibrary,
 };
 use std::{collections::BTreeSet, f32::consts::PI};
 
@@ -110,15 +110,6 @@ pub fn bake_item_model(
     let model = library
         .resolve(name)
         .or_else(|_| library.resolve(crate::resolve::MISSING_MODEL))?;
-    bake_resolved(&model, sprites)
-}
-
-/// Bake an already resolved model, e.g. one from
-/// [`ModelLibrary::resolve_with_textures`].
-pub fn bake_resolved(
-    model: &ResolvedCuboidModel,
-    sprites: &dyn SpriteLookup,
-) -> Result<BakedItemModel> {
     let known = |sprite: &str| sprite == MISSING_SPRITE || sprites.mask(sprite).is_some();
     let material = |m: &Material| {
         if known(&m.sprite) {
@@ -152,7 +143,7 @@ pub fn bake_resolved(
         quads
     } else {
         let mut quads =
-            bake_block_model(model, crate::bake::BlockModelTransform::new([0; 3], false))?;
+            bake_block_model(&model, crate::bake::BlockModelTransform::new([0; 3], false))?;
         for q in &mut quads {
             q.material = material(&q.material);
         }
@@ -307,87 +298,3 @@ fn extrude_layer(mask: &SpriteMask, material: &Material, layer: i32) -> Result<V
     }
     Ok(quads)
 }
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use crate::model::{CuboidModel, TextureSlot};
-    use std::collections::BTreeMap;
-
-    /// The stick: 2x2 with one transparent pixel. `item/cit`: one opaque pixel, so a bake
-    /// shows whose mask it extruded.
-    struct Sprites;
-    impl SpriteLookup for Sprites {
-        fn mask(&self, sprite: &str) -> Option<SpriteMask> {
-            match sprite {
-                "minecraft:item/stick" => Some(SpriteMask {
-                    width: 2,
-                    height: 2,
-                    frames: vec![vec![true, false, false, false]],
-                }),
-                "horizon_cit:item/cit" => Some(SpriteMask {
-                    width: 1,
-                    height: 1,
-                    frames: vec![vec![false]],
-                }),
-                _ => None,
-            }
-        }
-    }
-    fn library() -> ModelLibrary {
-        ModelLibrary::with_item_generator(BTreeMap::from(
-            [
-                ("item/generated", r#"{"parent":"builtin/generated","display":{"gui":{"scale":[2,2,2]}}}"#),
-                ("item/stick", r#"{"parent":"item/generated","textures":{"layer0":"item/stick"}}"#),
-                ("horizon:loop", r#"{"parent":"horizon:loop2"}"#),
-                ("horizon:loop2", r#"{"parent":"horizon:loop"}"#),
-                ("block/slab", r##"{"textures":{"particle":"#side","side":"block/absent"},"elements":[{"from":[0,0,0],"to":[16,8,16],"faces":{"up":{"texture":"#side"},"down":{"texture":"#side","cullface":"down"}}}]}"##),
-            ]
-            .map(|(name, json)| (name.to_owned(), CuboidModel::from_json(json).unwrap())),
-        ))
-        .unwrap()
-    }
-    #[test]
-    fn baking_by_name_falls_back_to_the_missing_model() {
-        let library = library();
-        // Front, back, and the 8 unit edges around the L of 3 opaque pixels.
-        let stick = bake_item_model(&library, &Sprites, "item/stick").unwrap();
-        assert_eq!(stick.quads.len(), 10);
-        // An unknown sprite bakes as the missing sprite.
-        let slab = bake_item_model(&library, &Sprites, "block/slab").unwrap();
-        assert_eq!(slab.quads.len(), 2);
-        assert_eq!(slab.particle.sprite, MISSING_SPRITE);
-        // A cyclic chain, an error to `resolve`, bakes as the missing cube.
-        let cyclic = bake_item_model(&library, &Sprites, "horizon:loop").unwrap();
-        assert_eq!(cyclic.quads.len(), 6);
-        assert!(
-            cyclic
-                .quads
-                .iter()
-                .all(|q| q.material.sprite == MISSING_SPRITE)
-        );
-    }
-    #[test]
-    fn replaced_layer_bakes_with_its_own_sprite() {
-        let library = library();
-        let child = BTreeMap::from([(
-            "layer0".to_owned(),
-            TextureSlot::Material(Material {
-                sprite: "horizon_cit:item/cit".to_owned(),
-                force_translucent: false,
-            }),
-        )]);
-        let model = library.resolve_with_textures("item/stick", &child).unwrap();
-        let baked = bake_resolved(&model, &Sprites).unwrap();
-        // The CIT sprite's own mask, one opaque pixel: front, back and 4 edges.
-        assert_eq!(baked.quads.len(), 6);
-        assert!(
-            baked
-                .quads
-                .iter()
-                .all(|q| q.material.sprite == "horizon_cit:item/cit")
-        );
-        assert_eq!(baked.particle.sprite, "horizon_cit:item/cit");
-        assert_eq!(baked.transforms[5].as_ref().unwrap().scale, [2.0; 3]);
-    }
-}

crates/horizon-assets/src/item_model.rs

@@ -16,8 +16,6 @@ use std::{
     sync::{Arc, Mutex},
 };
 
-mod component_predicate;
-mod foreign;
 mod special;
 pub use special::{SpecialKind, SpecialModel};
 
@@ -432,17 +430,6 @@ impl ItemModelNode {
     pub fn decode(v: &Value) -> Result<Self> {
         let m = object(v)?;
         let kind = ident(required(m, "type")?)?;
-        if kind == "minecraft:condition" {
-            let property = ident(required(m, "property")?)?;
-            if !property.starts_with("minecraft:") {
-                return Ok(Self::Condition {
-                    transformation: optional_transformation(m)?,
-                    property: ConditionProperty::Custom(property),
-                    on_true: Box::new(Self::decode(required(m, "on_true")?)?),
-                    on_false: Box::new(Self::decode(required(m, "on_false")?)?),
-                });
-            }
-        }
         Ok(match kind.as_str() {
             "minecraft:empty" => Self::Empty,
             "minecraft:model" => Self::Model(ModelLeaf {
@@ -463,21 +450,12 @@ impl ItemModelNode {
                     .collect::<Result<_>>()?,
                 transformation: optional_transformation(m)?,
             },
-            "minecraft:condition" if foreign::property_is_foreign(m)? => foreign::wrap(
-                Self::decode(required(m, "on_false")?)?,
-                optional_transformation(m)?,
-            ),
             "minecraft:condition" => Self::Condition {
                 transformation: optional_transformation(m)?,
                 property: ConditionProperty::decode(m)?,
                 on_true: Box::new(Self::decode(required(m, "on_true")?)?),
                 on_false: Box::new(Self::decode(required(m, "on_false")?)?),
             },
-            "minecraft:select" if foreign::property_is_foreign(m)? => {
-                // No case can match a property Horizon cannot read.
-                let fallback = get(m, "fallback").map(Self::decode).transpose()?;
-                foreign::wrap(fallback.unwrap_or(Self::Empty), optional_transformation(m)?)
-            }
             "minecraft:select" => {
                 let transformation = optional_transformation(m)?;
                 let property = SelectProperty::decode(m)?;
@@ -505,7 +483,6 @@ impl ItemModelNode {
                 }
             }
             "minecraft:range_dispatch" => {
-                let foreign_property = foreign::property_is_foreign(m)?;
                 let mut entries = list(required(m, "entries")?)?
                     .iter()
                     .map(|e| {
@@ -518,17 +495,6 @@ impl ItemModelNode {
                     .collect::<Result<Vec<_>>>()?;
                 // `Comparator.comparingDouble`: Double.compare, a total order.
                 entries.sort_by(|a, b| f64::from(a.0).total_cmp(&f64::from(b.0)));
-                if foreign_property {
-                    // A property Horizon cannot read is 0.
-                    let fallback = get(m, "fallback").map(Self::decode).transpose()?;
-                    let chosen = last_index_less_or_equal(&entries, 0.0)
-                        .map(|i| entries.swap_remove(i).1)
-                        .or(fallback);
-                    return Ok(foreign::wrap(
-                        chosen.unwrap_or(Self::Empty),
-                        optional_transformation(m)?,
-                    ));
-                }
                 Self::RangeDispatch {
                     transformation: optional_transformation(m)?,
                     property: NumericProperty::decode(m)?,
@@ -539,21 +505,12 @@ impl ItemModelNode {
                         .transpose()?,
                 }
             }
-            "minecraft:special" if SpecialModel::is_foreign(required(m, "model")?) => {
-                // The mod's own renderer is not run: the base model stands in.
-                Self::Model(ModelLeaf {
-                    model: ident(required(m, "base")?)?,
-                    transformation: optional_transformation(m)?,
-                    tints: Vec::new(),
-                })
-            }
             "minecraft:special" => Self::Special {
                 base: ident(required(m, "base")?)?,
                 transformation: optional_transformation(m)?,
                 model: SpecialModel::decode(required(m, "model")?)?,
             },
             "minecraft:bundle/selected_item" => Self::BundleSelectedItem,
-            other if foreign::is_foreign(other) => foreign::decode_node(other, m),
             _ => return Err(err("unknown item model type")),
         })
     }
@@ -645,8 +602,6 @@ impl TintSource {
             "minecraft:firework" => Self::Firework(default()?),
             "minecraft:potion" => Self::Potion(default()?),
             "minecraft:team" => Self::Team(default()?),
-            // A mod's own tint source, which its Java code computes: untinted here.
-            other if foreign::is_foreign(other) => Self::Constant(-1),
             _ => return Err(err("unknown item tint source")),
         })
     }
@@ -658,7 +613,6 @@ impl TintSource {
 
 #[derive(Clone, Debug, PartialEq)]
 pub enum ConditionProperty {
-    Custom(String),
     CustomModelData(i32),
     UsingItem,
     Broken,
@@ -674,7 +628,7 @@ pub enum ConditionProperty {
     ExtendedView,
     KeybindDown(String),
     ViewEntity,
-    /// A single `component` predicate; external predicate types use the host.
+    /// A `component` predicate, evaluated by the host.
     Component(Value),
 }
 impl ConditionProperty {
@@ -697,7 +651,13 @@ impl ConditionProperty {
             "minecraft:extended_view" => Self::ExtendedView,
             "minecraft:keybind_down" => Self::KeybindDown(string(required(m, "keybind")?)?),
             "minecraft:view_entity" => Self::ViewEntity,
-            "minecraft:component" => Self::Component(component_predicate::decode(m)?),
+            "minecraft:component" => {
+                let predicate = required(m, "predicate")?;
+                if object(predicate)?.len() != 1 {
+                    return Err(err("a single component predicate is expected"));
+                }
+                Self::Component(predicate.clone())
+            }
             _ => return Err(err("unknown condition property")),
         })
     }
@@ -991,10 +951,6 @@ pub struct Context<'a> {
 
 /// Host services the resolver cannot derive from data alone.
 pub trait ItemEnv {
-    /// A mod's namespaced conditional property, false when no mod supplies it.
-    fn item_model_property(&self, _property: &str, _stack: &StackView) -> bool {
-        false
-    }
     /// `PotionContents.getColorOr` for the potion/effects part: the mixed
     /// effect colour, or `None` when the contents have no visible effects.
     fn potion_effect_color(&self, _potion_contents: &Value) -> Option<i32> {
@@ -1008,14 +964,10 @@ pub trait ItemEnv {
     fn bundle_fullness(&self, _stack: &StackView, _components: &Components) -> f32 {
         0.0
     }
-    /// Additional component predicate types supplied by the host.
+    /// `ItemStack.getMaxStackSize` when the prototype has no component.
     fn component_matches(&self, _stack: &StackView, _predicate: &Value) -> bool {
         false
     }
-    /// Membership in the level's enchantment registry tags.
-    fn enchantment_in_tag(&self, _enchantment: &str, _tag: &str) -> bool {
-        false
-    }
     fn is_keybind_down(&self, _keybind: &str) -> bool {
         false
     }
@@ -1348,9 +1300,6 @@ impl Resolve<'_> {
     fn condition(&self, property: &ConditionProperty) -> bool {
         let owner = self.ctx.owner;
         match property {
-            ConditionProperty::Custom(property) => {
-                self.env.item_model_property(property, self.stack)
-            }
             ConditionProperty::CustomModelData(i) => {
                 self.component("minecraft:custom_model_data")
                     .and_then(|d| custom_data_at(d, "flags", *i))
@@ -1386,8 +1335,7 @@ impl Resolve<'_> {
             ConditionProperty::KeybindDown(key) => self.env.is_keybind_down(key),
             ConditionProperty::ViewEntity => owner.is_some_and(|o| o.is_view_entity),
             ConditionProperty::Component(predicate) => {
-                component_predicate::matches(predicate, self.components, self.env)
-                    .unwrap_or_else(|| self.env.component_matches(self.stack, predicate))
+                self.env.component_matches(self.stack, predicate)
             }
         }
     }
@@ -1769,7 +1717,5 @@ fn binary_search(a: &[f32], key: f32) -> std::result::Result<usize, usize> {
     Err(low as usize)
 }
 
-#[cfg(test)]
-mod foreign_tests;
 #[cfg(test)]
 mod tests;

crates/horizon-assets/src/item_model/component_predicate.rs

@@ -1,177 +0,0 @@
-//! Component conditions used by enchantment-dependent item models.
-use super::*;
-
-/// `DataComponentPredicate.singleCodec`: a single predicate's type discriminator
-/// (`predicate`) and its wrapped codec's separate `value` field.
-pub(super) fn decode(m: &Map<String, Value>) -> Result<Value> {
-    let id = component_type(required(m, "predicate")?)?;
-    let mut value = required(m, "value")?.clone();
-    if matches!(
-        id.as_str(),
-        "minecraft:enchantments" | "minecraft:stored_enchantments"
-    ) {
-        let mut entries = Vec::new();
-        for entry in list(&value)? {
-            let mut entry = object(entry)?.clone();
-            if let Some(selector) = get(&entry, "enchantments") {
-                let selector = match selector {
-                    Value::Array(ids) => Value::Array(
-                        ids.iter()
-                            .map(ident)
-                            .map(|r| r.map(Value::String))
-                            .collect::<Result<_>>()?,
-                    ),
-                    Value::String(name) if name.starts_with('#') => {
-                        Value::String(format!("#{}", identifier(&name[1..])?))
-                    }
-                    _ => Value::String(ident(selector)?),
-                };
-                entry.insert("enchantments".into(), selector);
-            }
-            if let Some(levels) = get(&entry, "levels") {
-                let levels = if levels.is_object() {
-                    let mut bounds = Map::new();
-                    for key in ["min", "max"] {
-                        if let Some(n) = get(object(levels)?, key) {
-                            bounds.insert(key.into(), Value::from(int(n)?));
-                        }
-                    }
-                    // MinMaxBounds.Bounds.validateSwappedBoundsInCodec.
-                    if bounds
-                        .get("min")
-                        .and_then(Value::as_i64)
-                        .zip(bounds.get("max").and_then(Value::as_i64))
-                        .is_some_and(|(min, max)| min > max)
-                    {
-                        return Err(err("minimum exceeds maximum"));
-                    }
-                    Value::Object(bounds)
-                } else {
-                    Value::from(int(levels)?)
-                };
-                entry.insert("levels".into(), levels);
-            }
-            entries.push(Value::Object(entry));
-        }
-        value = Value::Array(entries);
-    }
-    Ok(Value::Object(Map::from_iter([(id, value)])))
-}
-
-/// `EnchantmentsPredicate.matches` and `EnchantmentPredicate.containedIn`:
-/// all entries must match; each entry needs one selected, present enchantment
-/// with a matching level. An empty predicate list still needs the component.
-pub(super) fn matches(
-    predicate: &Value,
-    components: &Components,
-    env: &dyn ItemEnv,
-) -> Option<bool> {
-    let (id, expected) = predicate.as_object()?.iter().next()?;
-    if !matches!(
-        id.as_str(),
-        "minecraft:enchantments" | "minecraft:stored_enchantments"
-    ) {
-        return None;
-    }
-    let Some(have) = components.get(id).and_then(Value::as_object) else {
-        return Some(false);
-    };
-    Some(expected.as_array()?.iter().all(|entry| {
-        let Some(entry) = entry.as_object() else {
-            return false;
-        };
-        have.iter().any(|(id, level)| {
-            let level = level.as_i64().unwrap_or(0);
-            let selector = get(entry, "enchantments");
-            let selected = match selector {
-                None => true,
-                Some(Value::String(s)) => s
-                    .strip_prefix('#')
-                    .map_or(s == id, |tag| env.enchantment_in_tag(id, tag)),
-                Some(Value::Array(ids)) => ids.iter().any(|s| s.as_str() == Some(id)),
-                _ => false,
-            };
-            selected
-                && if selector.is_some() {
-                    matches_enchantment(level, get(entry, "levels"))
-                } else {
-                    level_matches(level, get(entry, "levels"))
-                }
-        })
-    }))
-}
-
-/// `EnchantmentPredicate.matchesEnchantment`: a named enchantment needs a
-/// nonzero level even when its bounds accept zero.
-fn matches_enchantment(level: i64, bounds: Option<&Value>) -> bool {
-    level != 0 && level_matches(level, bounds)
-}
-
-/// `MinMaxBounds.Ints.matches`: inclusive bounds, or an exact integer.
-fn level_matches(level: i64, bounds: Option<&Value>) -> bool {
-    match bounds {
-        None => true,
-        Some(Value::Number(n)) => n.as_i64() == Some(level),
-        Some(Value::Object(bounds)) => {
-            get(bounds, "min")
-                .and_then(Value::as_i64)
-                .is_none_or(|min| level >= min)
-                && get(bounds, "max")
-                    .and_then(Value::as_i64)
-                    .is_none_or(|max| level <= max)
-        }
-        _ => false,
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use serde_json::json;
-
-    struct Tags;
-    impl ItemEnv for Tags {
-        fn enchantment_in_tag(&self, enchantment: &str, tag: &str) -> bool {
-            enchantment == "minecraft:density" && tag == "horizon:mace"
-        }
-    }
-
-    #[test]
-    fn unnamed_predicates_inspect_entries_but_named_ones_require_a_nonzero_level() {
-        let components = Components::from_iter([(
-            "minecraft:enchantments".into(),
-            json!({"minecraft:density":0}),
-        )]);
-        assert_eq!(
-            matches(&json!({"minecraft:enchantments":[{}]}), &components, &NoEnv),
-            Some(true)
-        );
-        assert_eq!(
-            matches(
-                &json!({"minecraft:enchantments":[{"enchantments":"minecraft:density"}]}),
-                &components,
-                &NoEnv
-            ),
-            Some(false)
-        );
-    }
-
-    #[test]
-    fn enchantment_selectors_use_the_hosts_registry_tags() {
-        let condition = json!({"predicate":"enchantments", "value":[
-            {"enchantments":"#horizon:mace", "levels":{"min":3}}
-        ]});
-        let predicate = decode(condition.as_object().unwrap()).unwrap();
-        let mut components = Components::from_iter([(
-            "minecraft:enchantments".into(),
-            json!({"minecraft:density":3}),
-        )]);
-        assert_eq!(matches(&predicate, &components, &Tags), Some(true));
-        assert_eq!(matches(&predicate, &components, &NoEnv), Some(false));
-        components.insert(
-            "minecraft:enchantments".into(),
-            json!({"minecraft:density":2}),
-        );
-        assert_eq!(matches(&predicate, &components, &Tags), Some(false));
-    }
-}

crates/horizon-assets/src/item_model/foreign.rs

@@ -1,114 +0,0 @@
-//! Nodes and properties of other namespaces (a mod's, NeoForge's) decode to the closest vanilla behaviour.
-use super::{
-    ItemModelNode, ModelLeaf, Result, TintSource, get, ident, identifier, list, object,
-    optional_transformation,
-};
-use crate::{json::error as err, math::Mat4};
-use serde_json::{Map, Value};
-
-/// Keys a mod's node usually keeps its real model under, in order of preference.
-const MODEL_KEYS: [&str; 4] = ["model", "base_model", "base", "fallback"];
-
-pub fn is_foreign(id: &str) -> bool {
-    !id.starts_with("minecraft:")
-}
-
-/// A composite carries the transformation a collapsed node had.
-pub fn wrap(node: ItemModelNode, transformation: Option<Mat4>) -> ItemModelNode {
-    match transformation {
-        None => node,
-        Some(_) => ItemModelNode::Composite {
-            models: vec![node],
-            transformation,
-        },
-    }
-}
-
-pub fn property_is_foreign(m: &Map<String, Value>) -> Result<bool> {
-    let property = m
-        .get("property")
-        .ok_or_else(|| err("missing property"))
-        .and_then(ident)?;
-    Ok(is_foreign(&property))
-}
-
-fn leaf(model: String, m: &Map<String, Value>) -> ItemModelNode {
-    let tints = get(m, "tints")
-        .and_then(|t| list(t).ok())
-        .map(|t| {
-            t.iter()
-                .filter_map(|t| TintSource::decode(t).ok())
-                .collect()
-        })
-        .unwrap_or_default();
-    ItemModelNode::Model(ModelLeaf {
-        model,
-        transformation: optional_transformation(m).ok().flatten(),
-        tints,
-    })
-}
-
-/// A node of an unknown non-vanilla type: its nested node, else its model id, else nothing.
-pub fn decode_node(kind: &str, m: &Map<String, Value>) -> ItemModelNode {
-    if kind == "neoforge:fluid_container" {
-        return fluid_container(m);
-    }
-    for key in MODEL_KEYS {
-        match m.get(key) {
-            Some(nested @ Value::Object(_)) => {
-                if let Ok(node) = ItemModelNode::decode(nested) {
-                    return wrap(node, optional_transformation(m).ok().flatten());
-                }
-            }
-            Some(Value::String(id)) => {
-                if let Ok(id) = identifier(id) {
-                    return leaf(id, m);
-                }
-            }
-            _ => {}
-        }
-    }
-    let by_suffix = m
-        .iter()
-        .filter(|(k, _)| k.ends_with("_model"))
-        .find_map(|(_, v)| v.as_str().and_then(|id| identifier(id).ok()));
-    match by_suffix {
-        Some(id) => leaf(id, m),
-        None => ItemModelNode::Empty,
-    }
-}
-
-// The fluid is not drawn: only the base (and an unmasked cover) texture, taken as a model id (a bucket's).
-fn fluid_container(m: &Map<String, Value>) -> ItemModelNode {
-    let textures = m.get("textures").and_then(|t| object(t).ok());
-    let texture = |key: &str| {
-        textures
-            .and_then(|t| t.get(key))
-            .and_then(Value::as_str)
-            .and_then(|id| identifier(id).ok())
-    };
-    let mut layers = vec![texture("base")];
-    if m.get("cover_is_mask") == Some(&Value::Bool(false)) {
-        layers.push(texture("cover"));
-    }
-    let mut models: Vec<ItemModelNode> = layers
-        .into_iter()
-        .flatten()
-        .map(|model| {
-            ItemModelNode::Model(ModelLeaf {
-                model,
-                transformation: None,
-                tints: Vec::new(),
-            })
-        })
-        .collect();
-    let transformation = optional_transformation(m).ok().flatten();
-    match models.len() {
-        0 => ItemModelNode::Empty,
-        1 => wrap(models.remove(0), transformation),
-        _ => ItemModelNode::Composite {
-            models,
-            transformation,
-        },
-    }
-}

crates/horizon-assets/src/item_model/foreign_tests.rs

@@ -1,185 +0,0 @@
-use super::*;
-
-fn node(json: &str) -> Result<ItemModelNode> {
-    ItemModelNode::decode(&serde_json::from_str(json).unwrap())
-}
-fn model_id(n: &ItemModelNode) -> &str {
-    match n {
-        ItemModelNode::Model(leaf) => &leaf.model,
-        other => panic!("not a model: {other:?}"),
-    }
-}
-
-#[test]
-fn node_with_a_model_id_draws_that_model() {
-    let n = node(r#"{"type":"mod:thing","model":"mod:item/thing","tints":[{"type":"mod:tint"}]}"#)
-        .unwrap();
-    assert_eq!(model_id(&n), "mod:item/thing");
-    let ItemModelNode::Model(leaf) = n else {
-        unreachable!()
-    };
-    assert_eq!(leaf.tints, vec![TintSource::Constant(-1)]);
-    let n = node(r#"{"type":"mod:thing","base_model":"mod:item/base"}"#).unwrap();
-    assert_eq!(model_id(&n), "mod:item/base");
-    let n = node(r#"{"type":"mod:thing","on_model":"mod:item/a"}"#).unwrap();
-    assert_eq!(model_id(&n), "mod:item/a");
-}
-
-#[test]
-fn node_with_a_nested_node_decodes_it() {
-    let n = node(
-        r#"{"type":"neoforge:trimmed_armor","base_model":{"type":"minecraft:model","model":"mod:item/boots"}}"#,
-    )
-    .unwrap();
-    assert_eq!(model_id(&n), "mod:item/boots");
-    let n = node(
-        r#"{"type":"mod:x","model":{"type":"mod:y","model":"mod:item/inner"},"transformation":[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1]}"#,
-    )
-    .unwrap();
-    let ItemModelNode::Composite {
-        models,
-        transformation,
-    } = n
-    else {
-        panic!("a transformation wraps the nested node")
-    };
-    assert!(transformation.is_some());
-    assert_eq!(model_id(&models[0]), "mod:item/inner");
-}
-
-#[test]
-fn node_with_nothing_usable_is_empty() {
-    assert!(matches!(
-        node(r#"{"type":"mod:facade"}"#).unwrap(),
-        ItemModelNode::Empty
-    ));
-    assert!(matches!(
-        node(r#"{"type":"mod:x","model":7}"#).unwrap(),
-        ItemModelNode::Empty
-    ));
-    assert!(ClientItem::from_json(r#"{"model":{"type":"ae2:facade"}}"#).is_ok());
-}
-
-#[test]
-fn unknown_vanilla_names_still_fail() {
-    assert!(node(r#"{"type":"minecraft:nope"}"#).is_err());
-    assert!(node(r#"{"type":"nope","model":"a:b"}"#).is_err());
-    let leaf = r#"{"type":"minecraft:model","model":"a:b"}"#;
-    for json in [
-        format!(
-            r#"{{"type":"minecraft:condition","property":"minecraft:nope","on_true":{leaf},"on_false":{leaf}}}"#
-        ),
-        format!(
-            r#"{{"type":"minecraft:select","property":"minecraft:nope","cases":[],"fallback":{leaf}}}"#
-        ),
-        format!(
-            r#"{{"type":"minecraft:range_dispatch","property":"minecraft:nope","entries":[],"fallback":{leaf}}}"#
-        ),
-    ] {
-        assert!(node(&json).is_err(), "{json}");
-    }
-    assert!(
-        node(r#"{"type":"minecraft:special","base":"a:b","model":{"type":"minecraft:nope"}}"#)
-            .is_err()
-    );
-    assert!(ClientItem::from_json(r#"{"model":{"type":"minecraft:nope"}}"#).is_err());
-}
-
-#[test]
-fn condition_property_is_false() {
-    let n = node(
-        r#"{"type":"minecraft:condition","property":"mod:flag",
-            "on_true":{"type":"minecraft:model","model":"a:yes"},
-            "on_false":{"type":"minecraft:model","model":"a:no"}}"#,
-    )
-    .unwrap();
-    // A mod's property stays a condition its mod answers per stack
-    // (`item_model_property`); with no mod answering it, `on_false` is drawn.
-    let ItemModelNode::Condition {
-        property: ConditionProperty::Custom(property),
-        on_false,
-        ..
-    } = &n
-    else {
-        panic!("not a custom condition: {n:?}")
-    };
-    assert_eq!(property, "mod:flag");
-    assert_eq!(model_id(on_false), "a:no");
-}
-
-#[test]
-fn select_property_takes_the_fallback_or_nothing() {
-    let n = node(
-        r#"{"type":"minecraft:select","property":"mod:level",
-            "cases":[{"when":"low","model":{"type":"minecraft:model","model":"a:low"}}],
-            "fallback":{"type":"minecraft:model","model":"a:other"}}"#,
-    )
-    .unwrap();
-    assert_eq!(model_id(&n), "a:other");
-    let n = node(r#"{"type":"minecraft:select","property":"mod:level","cases":[]}"#).unwrap();
-    assert!(matches!(n, ItemModelNode::Empty));
-}
-
-#[test]
-fn range_property_reads_zero() {
-    let entry = |t: f32, m: &str| {
-        format!(r#"{{"threshold":{t},"model":{{"type":"minecraft:model","model":"{m}"}}}}"#)
-    };
-    let fallback = r#","fallback":{"type":"minecraft:model","model":"a:fb"}"#;
-    let make = |entries: &[String], fallback: &str| {
-        node(&format!(
-            r#"{{"type":"minecraft:range_dispatch","property":"mod:fill","entries":[{}]{fallback}}}"#,
-            entries.join(",")
-        ))
-        .unwrap()
-    };
-    let n = make(&[entry(0.2, "a:one"), entry(0.4, "a:two")], fallback);
-    assert_eq!(model_id(&n), "a:fb");
-    let n = make(
-        &[
-            entry(0.0, "a:zero"),
-            entry(-1.0, "a:neg"),
-            entry(0.5, "a:half"),
-        ],
-        fallback,
-    );
-    assert_eq!(model_id(&n), "a:zero");
-    let n = make(&[entry(0.2, "a:one")], "");
-    assert!(matches!(n, ItemModelNode::Empty));
-}
-
-#[test]
-fn special_type_keeps_its_base_model() {
-    let n = node(
-        r#"{"type":"minecraft:special","base":"mod:item/cube","model":{"type":"mod:energy_cube"}}"#,
-    )
-    .unwrap();
-    assert_eq!(model_id(&n), "mod:item/cube");
-    let n =
-        node(r#"{"type":"minecraft:special","base":"a:b","model":{"type":"minecraft:shield"}}"#)
-            .unwrap();
-    assert!(matches!(n, ItemModelNode::Special { .. }));
-}
-
-#[test]
-fn fluid_container_draws_its_base_without_the_fluid() {
-    let n = node(
-        r#"{"type":"neoforge:fluid_container","fluid":"mod:gas","cover_is_mask":false,"flip_gas":true,
-            "textures":{"base":"minecraft:item/bucket","fluid":"neoforge:item/mask/bucket_fluid"}}"#,
-    )
-    .unwrap();
-    assert_eq!(model_id(&n), "minecraft:item/bucket");
-    let n = node(
-        r#"{"type":"neoforge:fluid_container","cover_is_mask":false,
-            "textures":{"base":"a:item/flask","cover":"a:item/flask_cover"}}"#,
-    )
-    .unwrap();
-    let ItemModelNode::Composite { models, .. } = n else {
-        panic!("base and cover")
-    };
-    assert_eq!(models.len(), 2);
-    assert!(matches!(
-        node(r#"{"type":"neoforge:fluid_container"}"#).unwrap(),
-        ItemModelNode::Empty
-    ));
-}

crates/horizon-assets/src/item_model/special.rs

@@ -77,13 +77,6 @@ fn one_of(v: &Value, names: &[&str]) -> Result<String> {
 }
 
 impl SpecialModel {
-    /// A special model type of another namespace, which Horizon has no renderer for.
-    pub fn is_foreign(v: &Value) -> bool {
-        v.get("type")
-            .and_then(Value::as_str)
-            .and_then(|t| super::identifier(t).ok())
-            .is_some_and(|t| super::foreign::is_foreign(&t))
-    }
     pub fn decode(v: &Value) -> Result<Self> {
         let m = object(v)?;
         let float_or = |key: &str, default: f32| get(m, key).map_or(Ok(default), float);

crates/horizon-assets/src/item_model/tests.rs

@@ -18,96 +18,3 @@ fn display_context_names_round_trip() {
         assert_eq!(DisplayContext::by_name(name).unwrap().name(), name);
     }
 }
-
-#[test]
-fn a_mods_tint_source_is_untinted_and_an_unknown_vanilla_one_fails() {
-    let tint = |json: &str| TintSource::decode(&serde_json::from_str(json).unwrap());
-    assert_eq!(
-        tint(r#"{"type":"ae2:storage_cell_state"}"#).unwrap(),
-        TintSource::Constant(-1)
-    );
-    assert!(tint(r#"{"type":"minecraft:nonsense"}"#).is_err());
-}
-
-#[test]
-fn custom_condition_is_evaluated_per_stack_at_branch_selection() {
-    struct Env;
-    impl ItemEnv for Env {
-        fn item_model_property(&self, property: &str, stack: &StackView) -> bool {
-            assert_eq!(property, "example:charged");
-            stack.count > 1 && stack.patch.get("example:charged") == Some(&Some(Value::Bool(true)))
-        }
-    }
-    let definition = ClientItem::from_json(
-        r#"{"model":{
-        "type":"minecraft:condition", "property":"example:charged",
-        "on_true":{"type":"minecraft:model","model":"example:item/charged"},
-        "on_false":{"type":"minecraft:model","model":"example:item/idle"}
-    }}"#,
-    )
-    .unwrap();
-    let mut models = ItemModels::default();
-    models.definitions.insert("example:tool".into(), definition);
-    models.prototypes.insert(
-        "example:tool".into(),
-        BTreeMap::from([(
-            "minecraft:item_model".into(),
-            Value::String("example:tool".into()),
-        )]),
-    );
-    let context = Context {
-        display: DisplayContext::Gui,
-        owner: None,
-        level: None,
-        seed: 0,
-    };
-    let mut stack = StackView::new("example:tool", 1);
-    let chosen = |stack: &StackView, env: &dyn ItemEnv| {
-        let resolved = models.resolve(stack, &context, env);
-        assert_eq!(resolved.layers.len(), 1);
-        let LayerContent::Model { model } = &resolved.layers[0].content else {
-            panic!("expected model leaf")
-        };
-        model.clone()
-    };
-    assert_eq!(chosen(&stack, &NoEnv), "example:item/idle");
-    assert_eq!(chosen(&stack, &Env), "example:item/idle");
-    stack
-        .patch
-        .insert("example:charged".into(), Some(Value::Bool(true)));
-    assert_eq!(chosen(&stack, &Env), "example:item/idle");
-    stack.count = 2;
-    assert_eq!(chosen(&stack, &Env), "example:item/charged");
-    assert_eq!(chosen(&stack, &NoEnv), "example:item/idle");
-    stack.patch.insert("example:charged".into(), None);
-    assert_eq!(chosen(&stack, &Env), "example:item/idle");
-}
-
-#[test]
-fn custom_condition_validates_its_name_and_both_branches() {
-    let node = |property: &str, on_true: Value| {
-        ItemModelNode::decode(&serde_json::json!({
-            "type": "minecraft:condition", "property": property,
-            "on_true": on_true, "on_false": {"type": "minecraft:empty"}
-        }))
-    };
-    let empty = serde_json::json!({"type": "minecraft:empty"});
-    for name in [
-        "minecraft:unknown",
-        "unknown",
-        "example:Bad",
-        "bad name:charged",
-    ] {
-        assert!(node(name, empty.clone()).is_err(), "{name}");
-    }
-    assert!(node("example:charged", Value::Null).is_err());
-    assert!(matches!(
-        node("minecraft:damaged", empty.clone()).unwrap(),
-        ItemModelNode::Condition {
-            property: ConditionProperty::Damaged,
-            ..
-        }
-    ));
-    assert!(matches!(node("example:charged", empty).unwrap(),
-        ItemModelNode::Condition { property: ConditionProperty::Custom(name), .. } if name == "example:charged"));
-}

crates/horizon-assets/src/json.rs

@@ -87,39 +87,6 @@ pub(crate) fn object(raw: &RawValue) -> Result<Object<'_>> {
     }
     Ok(serde_json::from_str(raw.get())?)
 }
-/// The members of an object in document order, which `object` loses.
-pub(crate) fn ordered_object(raw: &RawValue) -> Result<Vec<(String, &RawValue)>> {
-    struct Members<'a>(Vec<(String, &'a RawValue)>);
-    impl<'de> serde::Deserialize<'de> for Members<'de> {
-        fn deserialize<D: serde::Deserializer<'de>>(
-            deserializer: D,
-        ) -> std::result::Result<Self, D::Error> {
-            struct Visitor;
-            impl<'de> serde::de::Visitor<'de> for Visitor {
-                type Value = Members<'de>;
-                fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result {
-                    f.write_str("an object")
-                }
-                fn visit_map<A: serde::de::MapAccess<'de>>(
-                    self,
-                    mut map: A,
-                ) -> std::result::Result<Self::Value, A::Error> {
-                    let mut members: Vec<(String, &'de RawValue)> = Vec::new();
-                    while let Some(entry) = map.next_entry::<String, &'de RawValue>()? {
-                        members.retain(|(name, _)| *name != entry.0);
-                        members.push(entry);
-                    }
-                    Ok(Members(members))
-                }
-            }
-            deserializer.deserialize_map(Visitor)
-        }
-    }
-    if !raw.get().starts_with('{') {
-        return Err(error("expected object"));
-    }
-    Ok(serde_json::from_str::<Members>(raw.get())?.0)
-}
 pub(crate) fn array(raw: &RawValue) -> Result<Vec<&RawValue>> {
     Ok(serde_json::from_str(raw.get())?)
 }

crates/horizon-assets/src/lib.rs

@@ -9,7 +9,6 @@ pub mod item_model;
 mod json;
 pub mod math;
 pub mod model;
-pub mod obj;
 pub mod palette;
 pub mod resolve;
 

crates/horizon-assets/src/math.rs

@@ -335,177 +335,6 @@ pub fn quaternion_from_axis_angle(angle: f32, axis: [f32; 3]) -> [f32; 4] {
     [axis[0] * sin, axis[1] * sin, axis[2] * sin, cos]
 }
 
-/// A JOML `Matrix3f`: `m[column][row]`.
-type Mat3 = [[f32; 3]; 3];
-
-/// `Matrix3f.mul`: `a * b`.
-fn mul3(a: &Mat3, b: &Mat3) -> Mat3 {
-    std::array::from_fn(|c| {
-        std::array::from_fn(|r| fma(a[0][r], b[c][0], fma(a[1][r], b[c][1], a[2][r] * b[c][2])))
-    })
-}
-/// `Matrix3f.transpose`.
-fn transpose3(m: &Mat3) -> Mat3 {
-    std::array::from_fn(|c| std::array::from_fn(|r| m[r][c]))
-}
-/// `Matrix3f.rotate(Quaternionfc)`: `m * R(q)`, without fma.
-fn rotate3(m: &Mat3, q: [f32; 4]) -> Mat3 {
-    let [x, y, z, w] = q;
-    let (w2, x2, y2, z2) = (w * w, x * x, y * y, z * z);
-    let (zw, xy, xz, yw, yz, xw) = (z * w, x * y, x * z, y * w, y * z, x * w);
-    let (zw, xy, xz, yw, yz, xw) = (zw + zw, xy + xy, xz + xz, yw + yw, yz + yz, xw + xw);
-    let rotation = [
-        [w2 + x2 - z2 - y2, xy + zw, xz - yw],
-        [xy - zw, y2 - z2 + w2 - x2, yz + xw],
-        [yw + xz, yz - xw, z2 - y2 - x2 + w2],
-    ];
-    std::array::from_fn(|c| {
-        let rc = rotation[c];
-        std::array::from_fn(|r| m[0][r] * rc[0] + m[1][r] * rc[1] + m[2][r] * rc[2])
-    })
-}
-/// `Quaternionf.mul`: `a * b`.
-fn quaternion_mul(a: [f32; 4], b: [f32; 4]) -> [f32; 4] {
-    let ([x, y, z, w], [qx, qy, qz, qw]) = (a, b);
-    [
-        fma(w, qx, fma(x, qw, fma(y, qz, -z * qy))),
-        fma(w, qy, fma(-x, qz, fma(y, qw, z * qx))),
-        fma(w, qz, fma(x, qy, fma(-y, qx, z * qw))),
-        fma(w, qw, fma(-x, qx, fma(-y, qy, -z * qz))),
-    ]
-}
-
-/// `GivensParameters`: the half angle's sine and cosine.
-#[derive(Clone, Copy)]
-struct Givens(f32, f32);
-
-impl Givens {
-    /// `GivensParameters.fromUnnormalized`.
-    fn unnormalized(sin_half: f32, cos_half: f32) -> Self {
-        let inv = 1.0 / (sin_half * sin_half + cos_half * cos_half).sqrt();
-        Self(inv * sin_half, inv * cos_half)
-    }
-    /// `MatrixUtil.PI_4`: `fromPositiveAngle(π / 4)`.
-    fn quarter_pi() -> Self {
-        let half = std::f32::consts::FRAC_PI_4 / 2.0;
-        let sin = joml_sin(half);
-        Self(sin, cos_from_sin(sin, half))
-    }
-    fn inverse(self) -> Self {
-        Self(-self.0, self.1)
-    }
-    fn cos(self) -> f32 {
-        self.1 * self.1 - self.0 * self.0
-    }
-    fn sin(self) -> f32 {
-        2.0 * self.0 * self.1
-    }
-    /// `aroundX/Y/Z(Quaternionf)` (axis 0, 1, 2).
-    fn quaternion(self, axis: usize) -> [f32; 4] {
-        let mut q = [0.0, 0.0, 0.0, self.1];
-        q[axis] = self.0;
-        q
-    }
-    /// `aroundX/Y/Z(Matrix3f)` (axis 0, 1, 2).
-    fn matrix(self, axis: usize) -> Mat3 {
-        let (cos, sin) = (self.cos(), self.sin());
-        let (a, b) = ((axis + 1) % 3, (axis + 2) % 3);
-        let mut m = [[0.0; 3]; 3];
-        m[axis][axis] = 1.0;
-        m[a][a] = cos;
-        m[b][b] = cos;
-        m[a][b] = sin;
-        m[b][a] = -sin;
-        m
-    }
-}
-
-/// `MatrixUtil.approxGivensQuat`.
-fn approx_givens(a11: f32, a12: f32, a22: f32) -> Givens {
-    let g = 3.0 + 2.0 * 2.0f32.sqrt();
-    let (cos_half, sin_half) = (2.0 * (a11 - a22), a12);
-    if g * sin_half * sin_half < cos_half * cos_half {
-        Givens::unnormalized(sin_half, cos_half)
-    } else {
-        Givens::quarter_pi()
-    }
-}
-/// `MatrixUtil.qrGivensQuat`.
-fn qr_givens(a1: f32, a2: f32) -> Givens {
-    let p = f64::from(a1).hypot(f64::from(a2)) as f32;
-    let mut sin_half = if p > 1.0e-6 { a2 } else { 0.0 };
-    let mut cos_half = a1.abs() + if p > 1.0e-6 { p } else { 1.0e-6 };
-    if a1 < 0.0 {
-        std::mem::swap(&mut sin_half, &mut cos_half);
-    }
-    Givens::unnormalized(sin_half, cos_half)
-}
-/// `MatrixUtil.stepJacobi`: the xy, xz then yz pairs, each by
-/// `similarityTransform` (`R^T * m * R`).
-fn step_jacobi(m: &mut Mat3, q: &mut [f32; 4]) {
-    let mut rotate = |m: &mut Mat3, g: Givens, axis: usize| {
-        *q = quaternion_mul(*q, g.quaternion(axis));
-        let r = g.matrix(axis);
-        *m = mul3(&transpose3(&r), &mul3(m, &r));
-    };
-    if m[0][1] * m[0][1] + m[1][0] * m[1][0] > 1.0e-6 {
-        let g = approx_givens(m[0][0], 0.5 * (m[0][1] + m[1][0]), m[1][1]);
-        rotate(m, g, 2);
-    }
-    if m[0][2] * m[0][2] + m[2][0] * m[2][0] > 1.0e-6 {
-        let g = approx_givens(m[0][0], 0.5 * (m[0][2] + m[2][0]), m[2][2]).inverse();
-        rotate(m, g, 1);
-    }
-    if m[1][2] * m[1][2] + m[2][1] * m[2][1] > 1.0e-6 {
-        let g = approx_givens(m[1][1], 0.5 * (m[1][2] + m[2][1]), m[2][2]);
-        rotate(m, g, 0);
-    }
-}
-
-/// `MatrixUtil.svdDecompose(Matrix4fc, ...)`, how `new Transformation(matrix)`
-/// splits a matrix: translation, left rotation, scale, right rotation. The
-/// right rotation diagonalizes `a^T * a` (`eigenvalueJacobi`, 5 steps), then
-/// QR Givens rotations about z, y and x bring `a * R(right)` to the scale.
-pub fn svd_decompose(m: &Mat4) -> ([f32; 3], [f32; 4], [f32; 3], [f32; 4]) {
-    let inv = 1.0 / m.0[3][3];
-    let a: Mat3 = std::array::from_fn(|c| std::array::from_fn(|r| m.0[c][r] * inv));
-    let mut b = mul3(&transpose3(&a), &a);
-    let mut right = [0.0, 0.0, 0.0, 1.0];
-    for _ in 0..5 {
-        step_jacobi(&mut b, &mut right);
-    }
-    right = normalize_quaternion(right);
-    let (x_small, y_small) = (f64::from(b[0][0]) < 1.0e-6, f64::from(b[1][1]) < 1.0e-6);
-    let mut left = [0.0, 0.0, 0.0, 1.0];
-    let mut r = rotate3(&a, right);
-    let mut qr = |r: &mut Mat3, g: Givens, axis: usize| {
-        left = quaternion_mul(left, g.quaternion(axis));
-        *r = mul3(&transpose3(&g.matrix(axis)), r);
-    };
-    let g = if x_small {
-        qr_givens(r[1][1], -r[1][0])
-    } else {
-        qr_givens(r[0][0], r[0][1])
-    };
-    qr(&mut r, g, 2);
-    let g = if x_small {
-        qr_givens(r[2][2], -r[2][0])
-    } else {
-        qr_givens(r[0][0], r[0][2])
-    };
-    qr(&mut r, g.inverse(), 1);
-    let g = if y_small {
-        qr_givens(r[2][2], -r[2][1])
-    } else {
-        qr_givens(r[1][1], r[1][2])
-    };
-    qr(&mut r, g, 0);
-    let scale = [r[0][0], r[1][1], r[2][2]];
-    let translation = std::array::from_fn(|i| m.0[3][i] * inv);
-    let [x, y, z, w] = right;
-    (translation, left, scale, [-x, -y, -z, w])
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -526,51 +355,6 @@ mod tests {
         assert!((m.0[0][1] - 1.0).abs() < 1e-6 && m.0[0][0].abs() < 1e-6);
     }
     #[test]
-    fn svd_decomposes_like_matrix_util() {
-        let bits = |v: &[f32]| v.iter().map(|f| f.to_bits()).collect::<Vec<_>>();
-        let parts = |m: [f32; 16]| {
-            let (t, l, s, r) = svd_decompose(&Mat4::from_row_major(m));
-            [bits(&t), bits(&l), bits(&s), bits(&r)]
-        };
-        // Values from MatrixUtil.svdDecompose on the 26.3 jar.
-        let scaled = [
-            2.0, 0.0, 0.0, 1.0, 0.0, 3.0, 0.0, -2.0, 0.0, 0.0, 0.5, 0.25, 0.0, 0.0, 0.0, 1.0,
-        ];
-        assert_eq!(
-            parts(scaled),
-            [
-                vec![0x3f80_0000u32, 0xc000_0000, 0x3e80_0000],
-                vec![0u32, 0, 0, 0x3f80_0000],
-                vec![0x4000_0000u32, 0x4040_0000, 0x3f00_0000],
-                vec![0x8000_0000u32, 0x8000_0000, 0x8000_0000, 0x3f80_0000],
-            ]
-        );
-        let quarter_turn = [
-            0.0, -1.0, 0.0, 0.5, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0,
-        ];
-        assert_eq!(
-            parts(quarter_turn),
-            [
-                vec![0x3f00_0000u32, 0, 0],
-                vec![0u32, 0, 0x3f35_04f3, 0x3f35_04f3],
-                vec![0x3f7f_ffffu32, 0x3f7f_ffff, 0x3f80_0000],
-                vec![0x8000_0000u32, 0x8000_0000, 0x8000_0000, 0x3f80_0000],
-            ]
-        );
-        let sheared = [
-            1.0, 0.5, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.25, 0.0, 2.0, 3.0, 0.0, 0.0, 0.0, 2.0,
-        ];
-        assert_eq!(
-            parts(sheared),
-            [
-                vec![0u32, 0, 0x3fc0_0000],
-                vec![0x3c03_7010u32, 0x3d38_d722, 0x3ea8_ef95, 0x3f71_60d9],
-                vec![0x3f23_2630u32, 0x3ec6_bdde, 0x3f81_5b1f],
-                vec![0xbcc5_7e11u32, 0xbda8_1e36, 0xbee2_916d, 0x3f64_860a],
-            ]
-        );
-    }
-    #[test]
     fn half_turn_has_exact_zeros_like_joml() {
         let half_turn = 180.0 * (std::f64::consts::PI / 180.0) as f32;
         assert_eq!(quaternion_xyz(0.0, half_turn, 0.0), [0.0, 1.0, 0.0, 0.0]);

crates/horizon-assets/src/model.rs

@@ -5,7 +5,7 @@
 //! does; render preparation must diagnose these before baking.
 use crate::json::*;
 use serde_json::value::RawValue;
-use std::{collections::BTreeMap, sync::Arc};
+use std::collections::BTreeMap;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
 pub enum Direction {
@@ -59,92 +59,11 @@ pub enum TextureSlot {
 #[derive(Clone, Debug, PartialEq)]
 pub struct CuboidModel {
     pub parent: Option<String>,
-    pub loader: Option<Loader>,
     pub ambient_occlusion: Option<bool>,
     pub gui_light: Option<GuiLight>,
     pub textures: BTreeMap<String, TextureSlot>,
     pub elements: Option<Vec<Option<Element>>>,
     pub display: Option<ItemTransforms>,
-    /// NeoForge's `render_type`, without a `minecraft:` prefix.
-    pub render_type: Option<String>,
-    /// A model's `visibility`: an obj object or composite child name to shown; absent is shown.
-    pub visibility: BTreeMap<String, bool>,
-}
-/// A custom model loader's payload; a model inherits its parent's loader unless it names its own.
-#[derive(Clone, Debug, PartialEq)]
-pub enum Loader {
-    /// `neoforge:composite`: children in document order.
-    Composite {
-        children: Vec<(String, Arc<CuboidModel>)>,
-        /// Child name to shown; a child absent from the map is shown.
-        visibility: BTreeMap<String, bool>,
-    },
-    /// `neoforge:obj`: `model` and `mtl_override` are asset locations.
-    Obj {
-        model: String,
-        flip_v: bool,
-        shade_quads: Option<bool>,
-        mtl_override: Option<String>,
-    },
-    /// A loader this decoder does not know: it adds no geometry.
-    Unknown(String),
-}
-/// NeoForge's `neoforge_data` of an element or a face; a face's keys win.
-#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
-pub struct NeoforgeData {
-    pub block_light: Option<u8>,
-    pub sky_light: Option<u8>,
-    /// ARGB.
-    pub color: Option<i32>,
-    pub ambient_occlusion: Option<bool>,
-}
-impl NeoforgeData {
-    /// `self` over `base`, key by key.
-    pub fn over(self, base: Self) -> Self {
-        Self {
-            block_light: self.block_light.or(base.block_light),
-            sky_light: self.sky_light.or(base.sky_light),
-            color: self.color.or(base.color),
-            ambient_occlusion: self.ambient_occlusion.or(base.ambient_occlusion),
-        }
-    }
-    fn decode(raw: &RawValue) -> Result<Self> {
-        let obj = object(raw)?;
-        let light = |key: &str| -> Result<Option<u8>> {
-            Ok(obj
-                .get(key)
-                .map(|r| integer(r))
-                .transpose()?
-                .map(|v| v.clamp(0, 15) as u8))
-        };
-        // Some mods spell both lights as one `light_emission`.
-        let emission = light("light_emission")?;
-        let color = match obj.get("color") {
-            Some(raw) if raw.get().starts_with('"') => {
-                let text = string(raw)?;
-                let text = text.trim();
-                let hex = text
-                    .strip_prefix('#')
-                    .or_else(|| text.strip_prefix("0x"))
-                    .or_else(|| text.strip_prefix("0X"));
-                match hex {
-                    Some(hex) => u32::from_str_radix(hex, 16).ok().map(|v| v as i32),
-                    None => text.parse::<u32>().ok().map(|v| v as i32),
-                }
-            }
-            Some(raw) => Some(integer(raw)?),
-            None => None,
-        };
-        Ok(Self {
-            block_light: light("block_light")?.or(emission),
-            sky_light: light("sky_light")?.or(emission),
-            color,
-            ambient_occlusion: obj
-                .get("ambient_occlusion")
-                .map(|r| boolean(r))
-                .transpose()?,
-        })
-    }
 }
 #[derive(Clone, Debug, PartialEq)]
 pub struct Element {
@@ -154,7 +73,6 @@ pub struct Element {
     pub rotation: Option<ElementRotation>,
     pub shade_direction_override: Option<Direction>,
     pub light_emission: u8,
-    pub neoforge_data: Option<NeoforgeData>,
 }
 #[derive(Clone, Debug, PartialEq)]
 pub struct Face {
@@ -164,9 +82,6 @@ pub struct Face {
     pub uv: Option<[f32; 4]>,
     /// Normalized counterclockwise quadrants, in the range 0..4.
     pub rotation: u8,
-    /// A face-level `light_emission`, which wins over its element's.
-    pub light_emission: Option<u8>,
-    pub neoforge_data: Option<NeoforgeData>,
 }
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum Axis {
@@ -239,11 +154,6 @@ impl CuboidModel {
         } else {
             Some(identifier(&parent)?)
         };
-        let loader = obj
-            .get("loader")
-            .filter(|raw| raw.get() != "null")
-            .map(|raw| Loader::decode(raw, &obj))
-            .transpose()?;
         let ambient_occlusion = obj
             .get("ambientocclusion")
             .map(|r| boolean(r))
@@ -275,83 +185,15 @@ impl CuboidModel {
             .get("display")
             .map(|r| ItemTransforms::decode(r))
             .transpose()?;
-        let render_type = obj
-            .get("render_type")
-            .filter(|raw| raw.get().starts_with('"'))
-            .map(|raw| string(raw))
-            .transpose()?
-            .map(|name| name.strip_prefix("minecraft:").unwrap_or(&name).to_owned());
         Ok(Self {
             parent,
-            loader,
             ambient_occlusion,
             gui_light,
             textures,
             elements,
             display,
-            render_type,
-            visibility: visibility(&obj)?,
         })
     }
-    /// The models this one needs besides itself: its parent and its composite children's parents.
-    pub fn referenced_models(&self) -> Vec<String> {
-        let mut names: Vec<String> = self.parent.iter().cloned().collect();
-        if let Some(Loader::Composite { children, .. }) = &self.loader {
-            for (_, child) in children {
-                names.extend(child.referenced_models());
-            }
-        }
-        names
-    }
-}
-fn visibility(obj: &Object<'_>) -> Result<BTreeMap<String, bool>> {
-    let mut visibility = BTreeMap::new();
-    if let Some(raw) = obj.get("visibility") {
-        for (key, raw) in object(raw)? {
-            visibility.insert(key, boolean(raw)?);
-        }
-    }
-    Ok(visibility)
-}
-impl Loader {
-    fn decode(raw: &RawValue, obj: &Object<'_>) -> Result<Self> {
-        let name = primitive_string(raw)?;
-        match name.as_str() {
-            "neoforge:composite" => {
-                let mut children = Vec::new();
-                if let Some(raw) = obj.get("children") {
-                    for (name, raw) in ordered_object(raw)? {
-                        children.push((name, Arc::new(CuboidModel::decode(raw)?)));
-                    }
-                }
-                Ok(Self::Composite {
-                    children,
-                    visibility: visibility(obj)?,
-                })
-            }
-            "neoforge:obj" => {
-                let optional = |key: &str| {
-                    obj.get(key)
-                        .filter(|raw| raw.get() != "null")
-                        .map(|raw| primitive_string(raw))
-                        .transpose()
-                };
-                Ok(Self::Obj {
-                    model: identifier(&optional("model")?.ok_or_else(|| error("missing model"))?)?,
-                    flip_v: obj
-                        .get("flip_v")
-                        .map(|r| boolean(r))
-                        .transpose()?
-                        .unwrap_or(false),
-                    shade_quads: obj.get("shade_quads").map(|r| boolean(r)).transpose()?,
-                    mtl_override: optional("mtl_override")?
-                        .map(|name| identifier(&name))
-                        .transpose()?,
-                })
-            }
-            _ => Ok(Self::Unknown(name)),
-        }
-    }
 }
 fn nullable<T>(raw: &RawValue, decode: impl FnOnce(&RawValue) -> Result<T>) -> Result<Option<T>> {
     if raw.get() == "null" {
@@ -431,10 +273,6 @@ impl Element {
             rotation,
             shade_direction_override,
             light_emission: light_emission as u8,
-            neoforge_data: obj
-                .get("neoforge_data")
-                .map(|r| NeoforgeData::decode(r))
-                .transpose()?,
         })
     }
 }
@@ -468,15 +306,6 @@ impl Face {
             texture,
             uv,
             rotation: (rotation / 90) as u8,
-            light_emission: obj
-                .get("light_emission")
-                .map(|r| integer(r))
-                .transpose()?
-                .map(|v| v.clamp(0, 15) as u8),
-            neoforge_data: obj
-                .get("neoforge_data")
-                .map(|r| NeoforgeData::decode(r))
-                .transpose()?,
         })
     }
 }

crates/horizon-assets/src/obj.rs

@@ -1,183 +0,0 @@
-//! Wavefront OBJ and MTL text, as obj-loader models use them.
-use std::collections::BTreeMap;
-
-#[derive(Clone, Copy, Debug, PartialEq)]
-pub struct ObjVertex {
-    /// Block units.
-    pub position: [f32; 3],
-    /// Texture coordinates as written, 0..1 across the sprite.
-    pub uv: [f32; 2],
-}
-/// One quad; a triangle repeats its last vertex.
-#[derive(Clone, Debug, PartialEq)]
-pub struct ObjFace {
-    /// Empty before any `usemtl`.
-    pub material: String,
-    /// The `o` (else `g`) it belongs to, which a model's `visibility` names.
-    pub object: String,
-    pub vertices: [ObjVertex; 4],
-}
-#[derive(Clone, Debug, Default, PartialEq)]
-pub struct ParsedObj {
-    pub mtllib: Option<String>,
-    pub faces: Vec<ObjFace>,
-}
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub enum MtlTexture {
-    /// `map_Kd #name`: a texture slot of the model.
-    Slot(String),
-    /// `map_Kd namespace:path`: a sprite.
-    Sprite(String),
-}
-/// A parsed OBJ with its materials.
-#[derive(Clone, Debug, Default, PartialEq)]
-pub struct ObjModel {
-    pub faces: Vec<ObjFace>,
-    pub materials: BTreeMap<String, MtlTexture>,
-}
-
-pub fn parse_obj(text: &str) -> Result<ParsedObj, String> {
-    let mut positions: Vec<[f32; 3]> = Vec::new();
-    let mut uvs: Vec<[f32; 2]> = Vec::new();
-    let mut parsed = ParsedObj::default();
-    let mut material = String::new();
-    let mut object = String::new();
-    for (number, line) in text.lines().enumerate() {
-        let mut words = line.split_whitespace();
-        let Some(keyword) = words.next() else {
-            continue;
-        };
-        let at = |message: &str| format!("line {}: {message}", number + 1);
-        match keyword {
-            _ if keyword.starts_with('#') => {}
-            "v" => positions.push(floats::<3>(words).ok_or_else(|| at("bad vertex"))?),
-            "vt" => {
-                let mut words = words;
-                let u = words.next().and_then(|w| w.parse().ok());
-                let v = words.next().map_or(Some(0.0), |w| w.parse().ok());
-                let (Some(u), Some(v)) = (u, v) else {
-                    return Err(at("bad texture coordinate"));
-                };
-                uvs.push([u, v]);
-            }
-            "mtllib" => parsed.mtllib = words.next().map(str::to_owned),
-            "usemtl" => material = words.next().unwrap_or("").to_owned(),
-            "o" | "g" => object = words.next().unwrap_or("").to_owned(),
-            "f" => {
-                let mut corners = Vec::new();
-                for word in words {
-                    let mut parts = word.split('/');
-                    let position = index(parts.next(), positions.len())
-                        .ok_or_else(|| at("bad vertex index"))?;
-                    let uv = match parts.next() {
-                        None | Some("") => [0.0; 2],
-                        some => {
-                            uvs[index(some, uvs.len()).ok_or_else(|| at("bad texture index"))?]
-                        }
-                    };
-                    corners.push(ObjVertex {
-                        position: positions[position],
-                        uv,
-                    });
-                }
-                if corners.len() < 3 {
-                    return Err(at("face needs three vertices"));
-                }
-                let mut push = |vertices: [ObjVertex; 4]| {
-                    parsed.faces.push(ObjFace {
-                        material: material.clone(),
-                        object: object.clone(),
-                        vertices,
-                    });
-                };
-                if corners.len() <= 4 {
-                    let last = corners[corners.len() - 1];
-                    push(std::array::from_fn(|i| {
-                        corners.get(i).copied().unwrap_or(last)
-                    }));
-                } else {
-                    for i in 1..corners.len() - 1 {
-                        push([corners[0], corners[i], corners[i + 1], corners[i + 1]]);
-                    }
-                }
-            }
-            _ => {}
-        }
-    }
-    Ok(parsed)
-}
-fn floats<'a, const N: usize>(mut words: impl Iterator<Item = &'a str>) -> Option<[f32; N]> {
-    let mut result = [0.0; N];
-    for value in &mut result {
-        *value = words.next()?.parse().ok()?;
-    }
-    Some(result)
-}
-/// A 1-based index, or a negative one counted from the end.
-fn index(word: Option<&str>, len: usize) -> Option<usize> {
-    let value: i64 = word?.parse().ok()?;
-    let index = if value < 0 {
-        len as i64 + value
-    } else {
-        value - 1
-    };
-    (0..len as i64).contains(&index).then_some(index as usize)
-}
-
-/// Material name to its `map_Kd`; other statements are ignored.
-pub fn parse_mtl(text: &str) -> BTreeMap<String, MtlTexture> {
-    let mut materials = BTreeMap::new();
-    let mut current = None;
-    for line in text.lines() {
-        let mut words = line.split_whitespace();
-        match words.next() {
-            Some("newmtl") => current = words.next().map(str::to_owned),
-            Some("map_Kd") => {
-                let (Some(name), Some(value)) = (&current, words.last()) else {
-                    continue;
-                };
-                let texture = match value.strip_prefix('#') {
-                    Some(slot) => MtlTexture::Slot(slot.to_owned()),
-                    None => MtlTexture::Sprite(value.to_owned()),
-                };
-                materials.insert(name.clone(), texture);
-            }
-            _ => {}
-        }
-    }
-    materials
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn quads_triangles_and_negative_indices() {
-        let text = "mtllib a.mtl\nv 0 0 0\nv 1 0 0\nv 1 1 0\nv 0 1 0\nvt 0 0\nvt 1 0\nvt 1 1\nvt 0 1\n\
-                    usemtl first\nf 1/1/1 2/2/1 3/3/1 4/4/1\nusemtl second\nf -4//1 -3//1 -2//1\n";
-        let parsed = parse_obj(text).unwrap();
-        assert_eq!(parsed.mtllib.as_deref(), Some("a.mtl"));
-        assert_eq!(parsed.faces.len(), 2);
-        assert_eq!(parsed.faces[0].material, "first");
-        assert_eq!(parsed.faces[0].vertices[2].uv, [1.0, 1.0]);
-        let triangle = &parsed.faces[1];
-        assert_eq!(triangle.material, "second");
-        assert_eq!(triangle.vertices[0].position, [0.0, 0.0, 0.0]);
-        assert_eq!(triangle.vertices[3], triangle.vertices[2]);
-        assert_eq!(triangle.vertices[2].position, [1.0, 1.0, 0.0]);
-    }
-    #[test]
-    fn bad_indices_are_errors() {
-        assert!(parse_obj("v 0 0 0\nf 1 2 3\n").is_err());
-        assert!(parse_obj("v 0 0 0\nv 1 0 0\nf 1 2\n").is_err());
-    }
-    #[test]
-    fn mtl_maps_slots_and_sprites() {
-        let materials =
-            parse_mtl("newmtl a\nKd 1 1 1\nmap_Kd #top\nnewmtl b\nmap_Kd mod:block/x\nnewmtl c\n");
-        assert_eq!(materials["a"], MtlTexture::Slot("top".into()));
-        assert_eq!(materials["b"], MtlTexture::Sprite("mod:block/x".into()));
-        assert!(!materials.contains_key("c"));
-    }
-}

crates/horizon-assets/src/resolve.rs

@@ -1,45 +1,18 @@
 //! Cuboid parent inheritance and texture-slot resolution.
-use crate::{
-    json::*,
-    model::*,
-    obj::{ObjModel, parse_mtl, parse_obj},
-};
+use crate::{json::*, model::*};
 use std::{
     collections::{BTreeMap, BTreeSet},
-    sync::{Arc, Mutex},
+    sync::Arc,
 };
 
 pub const MISSING_MODEL: &str = "minecraft:builtin/missing";
 /// `ItemModelGenerator.GENERATED_ITEM_MODEL_ID`.
 pub const GENERATED_MODEL: &str = "minecraft:builtin/generated";
-/// Composite children nest through parents that may name the composite again.
-const MAX_LOADER_DEPTH: u8 = 8;
 
-/// Reads asset files that models point at (`namespace:path` is `assets/namespace/path`).
-pub trait AssetReader: Send + Sync {
-    fn read_text(&self, location: &str) -> Option<String>;
-}
 /// Decoded models are immutable and their inherited geometry is shared.
 pub struct ModelLibrary {
     models: BTreeMap<String, Arc<CuboidModel>>,
     missing: Arc<CuboidModel>,
-    assets: Option<Arc<dyn AssetReader>>,
-    /// Keyed by obj and mtl override; `None` is a file that failed, already warned about.
-    objs: Mutex<BTreeMap<(String, Option<String>), Option<Arc<ObjModel>>>>,
-}
-/// What a model's loader adds to its own elements.
-#[derive(Clone, Debug)]
-pub enum ResolvedLoader {
-    /// The shown children, resolved on their own, in order.
-    Composite(Vec<ResolvedCuboidModel>),
-    Obj {
-        /// `None` when the file failed to load.
-        model: Option<Arc<ObjModel>>,
-        flip_v: bool,
-        shade: bool,
-        /// Objects the model chain's `visibility` hides.
-        hidden: BTreeSet<String>,
-    },
 }
 #[derive(Clone, Debug)]
 pub struct ResolvedCuboidModel {
@@ -49,17 +22,10 @@ pub struct ResolvedCuboidModel {
     pub textures: BTreeMap<String, Material>,
     /// Cyclic and dangling aliases are absent from `textures`.
     pub unresolved_textures: BTreeSet<String>,
-    /// NeoForge's `render_type`; the leaf-most model that sets one wins.
-    pub render_type: Option<String>,
     geometry: Option<Arc<CuboidModel>>,
     generated: bool,
-    loader: Option<ResolvedLoader>,
 }
 impl ResolvedCuboidModel {
-    /// Geometry from a custom loader, baked after the elements.
-    pub fn loader(&self) -> Option<&ResolvedLoader> {
-        self.loader.as_ref()
-    }
     /// Whether the top geometry is `builtin/generated`'s layer extrusion
     /// (no model closer to the leaf has elements of its own).
     pub fn uses_item_generator(&self) -> bool {
@@ -100,7 +66,6 @@ impl ModelLibrary {
     fn item_generator_model() -> CuboidModel {
         CuboidModel {
             parent: None,
-            loader: None,
             ambient_occlusion: None,
             gui_light: Some(GuiLight::Front),
             textures: BTreeMap::from([(
@@ -109,8 +74,6 @@ impl ModelLibrary {
             )]),
             elements: None,
             display: None,
-            render_type: None,
-            visibility: BTreeMap::new(),
         }
     }
     pub fn new(models: BTreeMap<String, CuboidModel>) -> Result<Self> {
@@ -137,112 +100,27 @@ impl ModelLibrary {
         Ok(Self {
             models: decoded,
             missing,
-            assets: None,
-            objs: Mutex::default(),
-        })
-    }
-    /// Where `neoforge:obj` models find their files.
-    pub fn with_assets(mut self, assets: Arc<dyn AssetReader>) -> Self {
-        self.assets = Some(assets);
-        self
-    }
-    /// This library plus `extra` models; an `extra` model replaces a
-    /// same-named one, but not the built-in missing and generated models.
-    /// Every existing model is shared, not copied.
-    pub fn overlaid(&self, extra: BTreeMap<String, CuboidModel>) -> Result<Self> {
-        let mut models = self.models.clone();
-        let mut added = BTreeSet::new();
-        for (name, model) in extra {
-            let name = identifier(&name)?;
-            if !added.insert(name.clone()) {
-                return Err(error("duplicate normalized model identifier"));
-            }
-            // The built-ins win, as `from_models` keeps `missing` and
-            // `with_item_generator` keeps `generated`.
-            if name != MISSING_MODEL && name != GENERATED_MODEL {
-                models.insert(name, Arc::new(model));
-            }
-        }
-        Ok(Self {
-            models,
-            missing: Arc::clone(&self.missing),
-            assets: self.assets.clone(),
-            objs: Mutex::default(),
         })
     }
     /// Follow the complete parent chain. A missing resource uses the built-in
     /// model; a cyclic chain is rejected, as native discovery excludes it.
     /// The returned model can outlive this library without copying its elements.
     pub fn resolve(&self, name: &str) -> Result<ResolvedCuboidModel> {
-        self.resolve_name(name, None)
-    }
-    /// Whether `name` and every parent it reaches are models of this library,
-    /// with no cycle: `resolve` puts the missing model in for any other.
-    pub fn resolves(&self, name: &str) -> bool {
-        let Ok(mut name) = identifier(name) else {
-            return false;
-        };
+        let mut name = identifier(name)?;
         let mut visited = BTreeSet::new();
+        let mut chain = Vec::new();
+        let mut names = Vec::new();
         loop {
-            let Some(model) = self.models.get(&name) else {
-                return false;
-            };
-            if !visited.insert(name.clone()) {
-                return false;
-            }
-            match &model.parent {
-                Some(parent) => name = parent.clone(),
-                None => return true,
-            }
-        }
-    }
-    /// `name`'s resolved model with a virtual child in front of it that has
-    /// only `textures`: the child's slots win, and `#references` anywhere in
-    /// the chain re-bind through them (so `builtin/generated`'s
-    /// `particle: #layer0` follows a replaced `layer0`). The child's slots are
-    /// taken as given: sprites namespaced, references without their `#`, as
-    /// the JSON decoder leaves them. A cyclic chain is an
-    /// error, as for `resolve`: a caller wanting the missing model falls
-    /// back to it.
-    pub fn resolve_with_textures(
-        &self,
-        name: &str,
-        child: &BTreeMap<String, TextureSlot>,
-    ) -> Result<ResolvedCuboidModel> {
-        self.resolve_name(name, Some(child))
-    }
-    fn resolve_name(
-        &self,
-        name: &str,
-        child: Option<&BTreeMap<String, TextureSlot>>,
-    ) -> Result<ResolvedCuboidModel> {
-        let next = Some(identifier(name)?);
-        self.resolve_chain(Vec::new(), Vec::new(), next, &BTreeMap::new(), child, 0)
-    }
-    /// `chain` and `names` start with models that are not in the library (a
-    /// composite child); `next` is the parent to follow. `fallback` slots lose
-    /// to any slot the chain defines.
-    fn resolve_chain(
-        &self,
-        mut chain: Vec<Arc<CuboidModel>>,
-        mut names: Vec<String>,
-        mut next: Option<String>,
-        fallback: &BTreeMap<String, TextureSlot>,
-        child: Option<&BTreeMap<String, TextureSlot>>,
-        depth: u8,
-    ) -> Result<ResolvedCuboidModel> {
-        if depth > MAX_LOADER_DEPTH {
-            return Err(error("composite models nest too deeply"));
-        }
-        let mut visited = BTreeSet::new();
-        while let Some(name) = next.take() {
             if !visited.insert(name.clone()) {
                 return Err(error("cyclic model parent"));
             }
             let model = self.models.get(&name).unwrap_or(&self.missing);
-            chain.push(Arc::clone(model));
-            names.push(name);
-            next = model.parent.clone();
+            chain.push(model);
+            names.push(name.clone());
+            match &model.parent {
+                Some(parent) => name = parent.clone(),
+                None => break,
+            }
         }
         let ambient_occlusion = chain
             .iter()
@@ -252,8 +130,10 @@ impl ModelLibrary {
             .iter()
             .find_map(|m| m.gui_light)
             .unwrap_or(GuiLight::Side);
-        let render_type = chain.iter().find_map(|m| m.render_type.clone());
-        let geometry = chain.iter().find(|m| m.elements.is_some()).map(Arc::clone);
+        let geometry = chain
+            .iter()
+            .find(|m| m.elements.is_some())
+            .map(|m| Arc::clone(m));
         let generated = chain
             .iter()
             .zip(&names)
@@ -272,68 +152,10 @@ impl ModelLibrary {
         };
         // Resolve aliases only after applying every child override. A reference
         // inherited from a parent binds to the child's final slot definition.
-        let mut slots: BTreeMap<String, &TextureSlot> =
-            fallback.iter().map(|(k, v)| (k.clone(), v)).collect();
-        for model in chain.iter().rev() {
+        let mut slots = BTreeMap::new();
+        for model in chain.into_iter().rev() {
             slots.extend(model.textures.iter().map(|(k, v)| (k.clone(), v)));
         }
-        if let Some(child) = child {
-            slots.extend(child.iter().map(|(k, v)| (k.clone(), v)));
-        }
-        let loader = match chain.iter().find_map(|m| m.loader.as_ref()) {
-            Some(Loader::Composite {
-                children,
-                visibility,
-            }) => {
-                let inherited: BTreeMap<String, TextureSlot> = slots
-                    .iter()
-                    .map(|(k, v)| (k.clone(), (*v).clone()))
-                    .collect();
-                // A model closer to the leaf overrides the loader's own map.
-                let mut visibility = visibility.clone();
-                for model in chain.iter().rev() {
-                    visibility.extend(model.visibility.iter().map(|(k, v)| (k.clone(), *v)));
-                }
-                let mut resolved = Vec::new();
-                for (child_name, child_model) in children {
-                    if visibility.get(child_name) == Some(&false) {
-                        continue;
-                    }
-                    resolved.push(self.resolve_chain(
-                        vec![Arc::clone(child_model)],
-                        vec![format!("{}#{child_name}", names[0])],
-                        child_model.parent.clone(),
-                        &inherited,
-                        None,
-                        depth + 1,
-                    )?);
-                }
-                Some(ResolvedLoader::Composite(resolved))
-            }
-            Some(Loader::Obj {
-                model,
-                flip_v,
-                shade_quads,
-                mtl_override,
-            }) => {
-                // Leaf wins: a model closer to the leaf overrides its parents' entries.
-                let mut visibility = BTreeMap::new();
-                for model in chain.iter().rev() {
-                    visibility.extend(model.visibility.iter().map(|(k, v)| (k.clone(), *v)));
-                }
-                Some(ResolvedLoader::Obj {
-                    model: self.load_obj(&names[0], model, mtl_override.as_deref()),
-                    flip_v: *flip_v,
-                    shade: shade_quads.unwrap_or(true),
-                    hidden: visibility
-                        .into_iter()
-                        .filter(|(_, shown)| !shown)
-                        .map(|(name, _)| name)
-                        .collect(),
-                })
-            }
-            Some(Loader::Unknown(_)) | None => None,
-        };
         let mut textures = BTreeMap::<String, Material>::new();
         let mut unresolved_textures = BTreeSet::<String>::new();
         for start in slots.keys() {
@@ -375,61 +197,12 @@ impl ModelLibrary {
             display,
             textures,
             unresolved_textures,
-            render_type,
             geometry,
             generated,
-            loader,
-        })
-    }
-    /// Parse an obj and its materials once; a failure warns once and yields no geometry.
-    fn load_obj(&self, label: &str, model: &str, mtl: Option<&str>) -> Option<Arc<ObjModel>> {
-        let key = (model.to_owned(), mtl.map(str::to_owned));
-        let mut cache = self.objs.lock().unwrap_or_else(|e| e.into_inner());
-        if let Some(found) = cache.get(&key) {
-            return found.clone();
-        }
-        let loaded = self.read_obj(model, mtl);
-        if let Err(message) = &loaded {
-            log::warn!("Horizon: obj model {label} ({model}): {message}");
-        }
-        let loaded = loaded.ok().map(Arc::new);
-        cache.insert(key, loaded.clone());
-        loaded
-    }
-    fn read_obj(&self, model: &str, mtl: Option<&str>) -> std::result::Result<ObjModel, String> {
-        let assets = self.assets.as_ref().ok_or("no asset source")?;
-        let text = assets.read_text(model).ok_or("file not found")?;
-        let parsed = parse_obj(&text)?;
-        let mtl = match (mtl, &parsed.mtllib) {
-            (Some(location), _) => Some(location.to_owned()),
-            (None, Some(file)) if file.contains(':') => Some(file.clone()),
-            (None, Some(file)) => {
-                let (namespace, path) = model.split_once(':').unwrap_or(("minecraft", model));
-                let directory = path.rsplit_once('/').map_or("", |(dir, _)| dir);
-                Some(if directory.is_empty() {
-                    format!("{namespace}:{file}")
-                } else {
-                    format!("{namespace}:{directory}/{file}")
-                })
-            }
-            (None, None) => None,
-        };
-        let materials = match mtl {
-            Some(location) => match assets.read_text(&location) {
-                Some(text) => parse_mtl(&text),
-                None => {
-                    log::warn!("Horizon: obj material file {location} not found");
-                    BTreeMap::new()
-                }
-            },
-            None => BTreeMap::new(),
-        };
-        Ok(ObjModel {
-            faces: parsed.faces,
-            materials,
         })
     }
 }
+
 /// The native missing-model cube uses slot names without a leading '#'.
 pub fn missing_model() -> CuboidModel {
     let faces = Direction::ALL
@@ -443,15 +216,12 @@ pub fn missing_model() -> CuboidModel {
                     texture: "missingno".to_owned(),
                     uv: Some([0.0, 0.0, 16.0, 16.0]),
                     rotation: 0,
-                    light_emission: None,
-                    neoforge_data: None,
                 }),
             )
         })
         .collect();
     CuboidModel {
         parent: None,
-        loader: None,
         ambient_occlusion: None,
         gui_light: None,
         elements: Some(vec![Some(Element {
@@ -461,12 +231,10 @@ pub fn missing_model() -> CuboidModel {
             rotation: None,
             shade_direction_override: None,
             light_emission: 0,
-            neoforge_data: None,
         })]),
         display: Some(ItemTransforms {
             contexts: std::array::from_fn(|_| DisplayTransform::Inherit),
         }),
-        render_type: None,
         textures: BTreeMap::from([
             (
                 "particle".to_owned(),
@@ -480,7 +248,6 @@ pub fn missing_model() -> CuboidModel {
                 }),
             ),
         ]),
-        visibility: BTreeMap::new(),
     }
 }
 
@@ -507,195 +274,6 @@ mod tests {
             }
         );
     }
-    fn library(models: &[(&str, &str)]) -> ModelLibrary {
-        ModelLibrary::with_item_generator(
-            models
-                .iter()
-                .map(|(name, json)| (name.to_string(), CuboidModel::from_json(json).unwrap()))
-                .collect(),
-        )
-        .unwrap()
-    }
-    const GENERATED: &str = r#"{"parent":"builtin/generated","display":{"ground":{"translation":[0,2,0],"scale":[0.5,0.5,0.5]}}}"#;
-    const CIT: &str = "horizon_cit:minecraft/optifine/cit/x";
-    #[test]
-    fn child_textures_replace_slots_and_rebind_the_generated_particle() {
-        let library = library(&[
-            ("item/generated", GENERATED),
-            (
-                "item/stick",
-                r#"{"parent":"item/generated","textures":{"layer0":"item/stick"}}"#,
-            ),
-        ]);
-        let child = BTreeMap::from([(
-            "layer0".to_owned(),
-            TextureSlot::Material(Material {
-                sprite: CIT.to_owned(),
-                force_translucent: false,
-            }),
-        )]);
-        let model = library.resolve_with_textures("item/stick", &child).unwrap();
-        assert!(model.uses_item_generator());
-        assert_eq!(model.material("layer0").unwrap().unwrap().sprite, CIT);
-        assert_eq!(model.material("particle").unwrap().unwrap().sprite, CIT);
-        assert_eq!(
-            model.display.contexts[6],
-            DisplayTransform::Explicit(Some(ItemTransform {
-                rotation: [0.0; 3],
-                translation: [0.0, 0.125, 0.0],
-                scale: [0.5; 3],
-            }))
-        );
-        // The library itself is untouched.
-        let plain = library.resolve("item/stick").unwrap();
-        assert_eq!(
-            plain.material("particle").unwrap().unwrap().sprite,
-            "minecraft:item/stick"
-        );
-    }
-    #[test]
-    fn overlaid_models_inherit_from_the_library_and_share_the_rest() {
-        let base = library(&[
-            ("item/generated", GENERATED),
-            (
-                "item/handheld",
-                r#"{"parent":"item/generated","display":{"thirdperson_righthand":{"rotation":[0,-90,55]}}}"#,
-            ),
-            (
-                "item/stick",
-                r#"{"parent":"item/generated","textures":{"layer0":"item/stick"}}"#,
-            ),
-            (
-                "item/apple",
-                r#"{"parent":"item/generated","textures":{"layer0":"item/apple"}}"#,
-            ),
-        ]);
-        let cit = format!(r#"{{"parent":"item/handheld","textures":{{"layer0":"{CIT}"}}}}"#);
-        let over = base
-            .overlaid(BTreeMap::from([
-                (CIT.to_owned(), CuboidModel::from_json(&cit).unwrap()),
-                (
-                    "item/stick".to_owned(),
-                    CuboidModel::from_json(
-                        r#"{"parent":"item/generated","textures":{"layer0":"item/bone"}}"#,
-                    )
-                    .unwrap(),
-                ),
-            ]))
-            .unwrap();
-        let model = over.resolve(CIT).unwrap();
-        assert!(model.uses_item_generator());
-        assert_eq!(model.material("particle").unwrap().unwrap().sprite, CIT);
-        let DisplayTransform::Explicit(Some(right)) = &model.display.contexts[1] else {
-            panic!("handheld's right-hand transform is inherited");
-        };
-        assert_eq!(right.rotation, [0.0, -90.0, 55.0]);
-        let sprite = |l: &ModelLibrary| {
-            l.resolve("item/stick").unwrap().textures["layer0"]
-                .sprite
-                .clone()
-        };
-        assert_eq!(sprite(&over), "minecraft:item/bone");
-        assert_eq!(sprite(&base), "minecraft:item/stick");
-        assert!(!base.resolve(CIT).unwrap().uses_item_generator());
-        assert!(Arc::ptr_eq(
-            &base.models["minecraft:item/apple"],
-            &over.models["minecraft:item/apple"]
-        ));
-    }
-    fn material(sprite: &str) -> TextureSlot {
-        TextureSlot::Material(Material {
-            sprite: sprite.to_owned(),
-            force_translucent: false,
-        })
-    }
-    #[test]
-    fn child_slots_take_part_in_reference_chains() {
-        let library = library(&[
-            (
-                "item/two",
-                r##"{"textures":{"layer0":"#tex","layer1":"item/b","tex":"item/a"}}"##,
-            ),
-            ("horizon:loop", r#"{"parent":"horizon:loop2"}"#),
-            ("horizon:loop2", r#"{"parent":"horizon:loop"}"#),
-        ]);
-        let child = BTreeMap::from([
-            // A base alias binds through a slot only the child sets...
-            ("tex".to_owned(), material(CIT)),
-            // ...and a child alias through the base's slots.
-            (
-                "particle".to_owned(),
-                TextureSlot::Reference("layer1".to_owned()),
-            ),
-            // A child alias to itself resolves to nothing, without looping.
-            ("self".to_owned(), TextureSlot::Reference("self".to_owned())),
-        ]);
-        let model = library.resolve_with_textures("item/two", &child).unwrap();
-        assert_eq!(model.material("layer0").unwrap().unwrap().sprite, CIT);
-        assert_eq!(
-            model.material("particle").unwrap().unwrap().sprite,
-            "minecraft:item/b"
-        );
-        assert_eq!(model.material("self").unwrap(), None);
-        assert!(model.unresolved_textures.contains("self"));
-        // An absent base is the missing cube under the child; a cyclic one an error.
-        let absent = library
-            .resolve_with_textures("item/absent", &child)
-            .unwrap();
-        assert_eq!(absent.elements().len(), 1);
-        assert!(
-            library
-                .resolve_with_textures("horizon:loop", &child)
-                .is_err()
-        );
-    }
-    #[test]
-    fn an_overlay_replaces_parents_but_not_the_built_ins_and_refuses_twins() {
-        let base = library(&[
-            ("item/generated", GENERATED),
-            ("item/handheld", r#"{"parent":"item/generated"}"#),
-            (
-                "item/sword",
-                r#"{"parent":"item/handheld","textures":{"layer0":"item/sword"}}"#,
-            ),
-        ]);
-        let model = |json: &str| CuboidModel::from_json(json).unwrap();
-        let over = base
-            .overlaid(BTreeMap::from([
-                (
-                    "item/handheld".to_owned(),
-                    model(
-                        r#"{"parent":"item/generated","display":{"head":{"rotation":[0,45,0]}}}"#,
-                    ),
-                ),
-                // Neither built-in can be replaced.
-                ("builtin/missing".to_owned(), model(r#"{"elements":[]}"#)),
-                ("builtin/generated".to_owned(), model("{}")),
-            ]))
-            .unwrap();
-        // The base's sword sees the overlay's parent; the base library does not.
-        let head = |l: &ModelLibrary| l.resolve("item/sword").unwrap().display.contexts[4].clone();
-        let DisplayTransform::Explicit(Some(rotated)) = head(&over) else {
-            panic!("the replaced parent's head transform");
-        };
-        assert_eq!(rotated.rotation, [0.0, 45.0, 0.0]);
-        assert_ne!(head(&base), head(&over));
-        // The generator kept: its `particle: #layer0`, which `{}` would drop.
-        let sword = over.resolve("item/sword").unwrap();
-        assert_eq!(
-            sword.material("particle").unwrap().unwrap().sprite,
-            "minecraft:item/sword"
-        );
-        // The missing cube kept, looked up by its own name, not as a fallback.
-        let missing = over.resolve("builtin/missing").unwrap();
-        assert_eq!(missing.elements().len(), 1);
-        // Two spellings of one id.
-        let twins = BTreeMap::from([
-            ("item/x".to_owned(), model("{}")),
-            ("minecraft:item/x".to_owned(), model("{}")),
-        ]);
-        assert!(base.overlaid(twins).is_err());
-    }
     #[test]
     fn absent_parents_fall_back_but_cycles_invalidate_descendants() {
         let a = CuboidModel::from_json(r#"{"parent":"horizon:b"}"#).unwrap();
@@ -715,115 +293,4 @@ mod tests {
             "minecraft:missingno"
         );
     }
-    #[test]
-    fn a_model_resolves_only_with_its_whole_parent_chain() {
-        let library = library(&[
-            ("item/generated", GENERATED),
-            (
-                "item/stick",
-                r#"{"parent":"item/generated","textures":{"layer0":"item/stick"}}"#,
-            ),
-            ("item/orphan", r#"{"parent":"item/gone"}"#),
-            ("item/a", r#"{"parent":"item/b"}"#),
-            ("item/b", r#"{"parent":"item/a"}"#),
-        ]);
-        assert!(library.resolves("item/stick"));
-        assert!(library.resolves("minecraft:item/stick"));
-        assert!(!library.resolves("item/absent"));
-        assert!(!library.resolves("item/orphan"));
-        assert!(!library.resolves("item/a"));
-        assert!(!library.resolves("Item/Stick"));
-    }
-    const LIGHTS: &str = r##"{"textures":{"a":"block/a"},"render_type":"minecraft:cutout","elements":[
-        {"from":[0,0,0],"to":[16,16,16],"light_emission":4,"neoforge_data":{"block_light":9,"color":-65536,"ambient_occlusion":false},
-         "faces":{"north":{"texture":"#a","neoforge_data":{"block_light":2,"sky_light":15,"unknown":1}},
-                  "south":{"texture":"#a","light_emission":11},
-                  "up":{"texture":"#a"}}}]}"##;
-    #[test]
-    fn neoforge_data_of_a_face_overrides_its_element_key_by_key() {
-        use crate::bake::bake_block_model;
-        let library = library(&[("block/lights", LIGHTS)]);
-        let model = library.resolve("block/lights").unwrap();
-        let quads =
-            bake_block_model(&model, crate::bake::BlockModelTransform::new([0; 3], false)).unwrap();
-        let by = |d| quads.iter().find(|q| q.facing == d).unwrap();
-        let north = by(Direction::North);
-        assert_eq!(north.light, [4, 15]);
-        assert_eq!(north.color, Some(-65536));
-        assert_eq!(north.ambient_occlusion, Some(false));
-        assert_eq!(by(Direction::South).light, [11, 11]);
-        assert_eq!(by(Direction::South).light_emission, 11);
-        assert_eq!(by(Direction::Up).light, [9, 4]);
-        assert!(
-            quads
-                .iter()
-                .all(|q| q.render_type == Some(crate::bake::RenderType::Cutout))
-        );
-    }
-    #[test]
-    fn vanilla_models_bake_without_extra_face_data() {
-        use crate::bake::bake_block_model;
-        let library = library(&[(
-            "block/plain",
-            r##"{"textures":{"a":"block/a"},"elements":[{"from":[0,0,0],"to":[16,16,16],"light_emission":6,"faces":{"up":{"texture":"#a"}}}]}"##,
-        )]);
-        let model = library.resolve("block/plain").unwrap();
-        let quad = &bake_block_model(&model, crate::bake::BlockModelTransform::new([0; 3], false))
-            .unwrap()[0];
-        assert_eq!((quad.light, quad.light_emission), ([6, 6], 6));
-        assert_eq!(
-            (quad.color, quad.ambient_occlusion, quad.render_type),
-            (None, None, None)
-        );
-    }
-    #[test]
-    fn render_type_comes_from_the_leaf_most_model_and_loses_its_prefix() {
-        let library = library(&[
-            ("block/base", r#"{"render_type":"translucent"}"#),
-            ("block/mid", r#"{"parent":"block/base"}"#),
-            (
-                "block/leaf",
-                r#"{"parent":"block/mid","render_type":"minecraft:cutout_mipped"}"#,
-            ),
-            ("block/bare", r#"{"parent":"block/mid"}"#),
-        ]);
-        let render = |name| library.resolve(name).unwrap().render_type;
-        assert_eq!(render("block/leaf").as_deref(), Some("cutout_mipped"));
-        assert_eq!(render("block/bare").as_deref(), Some("translucent"));
-        assert_eq!(render("block/absent"), None);
-        assert_eq!(
-            crate::bake::RenderType::by_name("minecraft:tripwire"),
-            Some(crate::bake::RenderType::Tripwire)
-        );
-        assert_eq!(crate::bake::RenderType::by_name("mod:glow"), None);
-    }
-    #[test]
-    fn neoforge_data_colour_and_legacy_emission_spellings() {
-        let model = CuboidModel::from_json(
-            r##"{"elements":[{"from":[0,0,0],"to":[1,1,1],"faces":{
-                "up":{"texture":"#a","neoforge_data":{"color":"#80FF0000","light_emission":7}},
-                "down":{"texture":"#a","neoforge_data":{"color":4294967295,"block_light":99}}}}]}"##,
-        )
-        .unwrap();
-        let elements = model.elements.unwrap();
-        let faces = &elements[0].as_ref().unwrap().faces;
-        let up = faces[&Direction::Up]
-            .as_ref()
-            .unwrap()
-            .neoforge_data
-            .unwrap();
-        assert_eq!(
-            (up.color, up.block_light, up.sky_light),
-            (Some(0x80FF0000u32 as i32), Some(7), Some(7))
-        );
-        let down = faces[&Direction::Down]
-            .as_ref()
-            .unwrap()
-            .neoforge_data
-            .unwrap();
-        assert_eq!(
-            (down.color, down.block_light, down.sky_light),
-            (Some(-1), Some(15), None)
-        );
-    }
 }