lingua-engine/.github/workflows/build.yml

name: Build

# M4's "done when": the build runs on both platforms with no editor
# plugins in the shipped binary. Neither half of that is verifiable from
# a single Linux dev machine — this workflow is what actually proves it,
# real builds on real ubuntu-latest and windows-latest runners, not just
# a cross-platform-looking csproj and hope.

on:
  push:
    branches: [master]
  pull_request:
  workflow_dispatch:

jobs:
  build:
    strategy:
      fail-fast: false
      matrix:
        include:
          - os: ubuntu-latest
            rid: linux-x64
          - os: windows-latest
            rid: win-x64
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-dotnet@v4
        with:
          dotnet-version: 9.0.x

      - name: Build native physics shim (Box3D, pinned commit — see native/physics-native/CMakeLists.txt)
        shell: bash
        run: |
          cmake -S native/physics-native -B native/physics-native/build -DCMAKE_BUILD_TYPE=Release
          cmake --build native/physics-native/build --config Release

      - name: Build native audio shim (miniaudio)
        shell: bash
        run: |
          cmake -S native/audio-native -B native/audio-native/build -DCMAKE_BUILD_TYPE=Release
          cmake --build native/audio-native/build --config Release

      # win-x64's .dll can only ever be produced here — nothing else in
      # this project can build or run one to check it. linux-x64's .so
      # IS also committed (for scripts/run-sample.sh's convenience on a
      # dev machine), but CI rebuilds and overwrites it fresh too, every
      # run: a real failure found by this exact workflow, not a
      # hypothetical one — the committed .so, built locally against a
      # newer glibc than ubuntu-latest ships, loaded fine here and threw
      # DllNotFoundException on the runner. Only a binary built on the
      # actual target platform is trustworthy there.
      - name: Place native libraries
        shell: bash
        run: |
          mkdir -p "plugins/engine.physics/Engine.Physics/native/${{ matrix.rid }}"
          mkdir -p "plugins/engine.audio/Engine.Audio/native/${{ matrix.rid }}"
          find native/physics-native/build -iname "liblingua_physics.so" -o -iname "lingua_physics.dll" \
            | xargs -I{} cp {} "plugins/engine.physics/Engine.Physics/native/${{ matrix.rid }}/"
          find native/audio-native/build -iname "liblingua_audio.so" -o -iname "lingua_audio.dll" \
            | xargs -I{} cp {} "plugins/engine.audio/Engine.Audio/native/${{ matrix.rid }}/"
          ls "plugins/engine.physics/Engine.Physics/native/${{ matrix.rid }}"
          ls "plugins/engine.audio/Engine.Audio/native/${{ matrix.rid }}"

      - name: Build
        run: dotnet build LinguaEngine.sln -c Release

      # Nothing in the suite opens a real GL window or a real audio device
      # (Engine.Audio.Tests forces miniaudio's null backend specifically so
      # this works) — the whole thing runs headless on both runners.
      - name: Test
        run: dotnet test LinguaEngine.sln -c Release --no-build

      - name: Stage the shippable build (engine.editor deliberately excluded)
        shell: bash
        run: |
          set -euo pipefail
          DIST="dist/${{ matrix.rid }}"
          STAGE="$DIST/plugins"
          mkdir -p "$STAGE"

          for id in engine.windowing engine.assets engine.render engine.input engine.physics engine.audio; do
            impl="$(awk -F. '{for(i=1;i<=NF;i++){$i=toupper(substr($i,1,1)) substr($i,2)}}1' OFS=. <<<"$id")"
            src="plugins/$id/$impl/bin/Release/net9.0"
            mkdir -p "$STAGE/$id"
            cp -r "$src/." "$STAGE/$id/"
            cp "plugins/$id/plugin.json" "$STAGE/$id/"
          done

          mkdir -p "$DIST/engine"
          cp -r src/Engine.Host/bin/Release/net9.0/. "$DIST/engine/"

          GAME_DST="$DIST/samples/PhysicsDemo/GamePlugins/physics-demo-game"
          mkdir -p "$GAME_DST"
          cp -r samples/PhysicsDemo/GamePlugins/physics-demo-game/bin/Release/net9.0/. "$GAME_DST/"
          cp samples/PhysicsDemo/GamePlugins/physics-demo-game/plugin.json "$GAME_DST/"

          cp -r samples/PhysicsDemo/assets "$DIST/samples/PhysicsDemo/assets"
          cp samples/PhysicsDemo/project.json samples/PhysicsDemo/scene.json "$DIST/samples/PhysicsDemo/"

      # A deliberately minimal, engine.windowing/engine.render-free stage,
      # separate from the full one above: found the hard way that --headless
      # only controls whether Engine.Host's own loop pumps a window — it
      # does nothing to stop a *loaded* engine.windowing/engine.render from
      # creating a real window and GL context regardless, which the full
      # PhysicsDemo project always does. That's fine on a real desktop; on
      # windows-latest's GPU-less runner it's "WGL: The driver does not
      # appear to support OpenGL," failing before physics ever got to run.
      # engine.physics needs no display at all, so this checks only that.
      - name: Stage a minimal headless-safe build for verification
        shell: bash
        run: |
          set -euo pipefail
          VERIFY="verify/${{ matrix.rid }}"
          mkdir -p "$VERIFY/plugins/engine.physics"
          cp -r plugins/engine.physics/Engine.Physics/bin/Release/net9.0/. "$VERIFY/plugins/engine.physics/"
          cp plugins/engine.physics/plugin.json "$VERIFY/plugins/engine.physics/"

          mkdir -p "$VERIFY/engine"
          cp -r src/Engine.Host/bin/Release/net9.0/. "$VERIFY/engine/"

          mkdir -p "$VERIFY/samples/PhysicsDemo"
          cp samples/PhysicsDemo/project.ci-headless.json "$VERIFY/samples/PhysicsDemo/project.json"
          cp samples/PhysicsDemo/scene.ci-headless.json "$VERIFY/samples/PhysicsDemo/scene.json"

      - name: Verify the shippable build actually runs (headless, real physics + real scene load, real P/Invoke)
        shell: bash
        run: |
          set -euo pipefail
          # Absolute paths only: Assembly.LoadFromAssemblyPath (which
          # PluginHost.Load uses) throws on a relative one — found by
          # hand running this exact staging locally before trusting it to
          # a workflow run at all.
          VERIFY="$(pwd)/verify/${{ matrix.rid }}"
          cd "$VERIFY/samples/PhysicsDemo"
          dotnet "$VERIFY/engine/Engine.Host.dll" run --headless \
            --plugins "$VERIFY/plugins" --project project.json --scene scene.json \
            --frames 200 --dump dump.json
          cat dump.json
          python3 -c "
          import json
          data = json.load(open('dump.json'))
          box = next(o for o in data if o['name'] == 'DemoBox')
          y = box['transform']['position'][1]
          assert 0.9 < y < 1.1, f'DemoBox should have settled near y=1.0, got y={y}'
          print(f'DemoBox settled at y={y:.4f} — physics ran for real on ${{ matrix.rid }}')
          "

      - uses: actions/upload-artifact@v4
        with:
          name: lingua-engine-${{ matrix.rid }}
          path: dist/${{ matrix.rid }}