build-emsdk.yml

name: Build WASM (Emscripten)

# Run CI only on changes to main branch, or any PR to main. Do not run CI on
# any other branch. Also, skip any non-source changes from running on CI
on:
  push:
    branches: main
    paths-ignore:
      - 'docs/**'
      - 'examples/**'
      - '.gitignore'
      - '*.rst'
      - '*.md'
      - '.github/workflows/*.yml'
      # re-include current file to not be excluded
      - '!.github/workflows/build-emsdk.yml'

  pull_request:
    branches: main
    paths-ignore:
      - 'docs/**'
      - 'examples/**'
      - '.gitignore'
      - '*.rst'
      - '*.md'
      - '.github/workflows/*.yml'
      # re-include current file to not be excluded
      - '!.github/workflows/build-emsdk.yml'

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}-emsdk
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-22.04
    env:
      # pin SDK version to the latest, update manually
      SDK_VERSION: 3.1.32.0
      SDK_ARCHIVE: python3.11-wasm-sdk-Ubuntu-22.04.tar.lz4
      SDKROOT: /opt/python-wasm-sdk

    steps:
    - uses: actions/checkout@v4.2.2

    - name: Regen with latest cython (using system python3)
      run: |
        pip3 install cython==3.0.10
        python3 setup.py cython_only

    - name: Install python-wasm-sdk
      run: |
        sudo apt-get install lz4
        echo https://github.com/pygame-web/python-wasm-sdk/releases/download/$SDK_VERSION/$SDK_ARCHIVE
        curl -sL --retry 5 https://github.com/pygame-web/python-wasm-sdk/releases/download/$SDK_VERSION/$SDK_ARCHIVE | tar xvP --use-compress-program=lz4
        # do not let SDL1 interfere
        rm -rf /opt/python-wasm-sdk/emsdk/upstream/emscripten/cache/sysroot/include/SDL
      working-directory: /opt

    - name: Build WASM with emsdk
      run: |
        ${SDKROOT}/python3-wasm setup.py build -j$(nproc)

    - name: Generate libpygame.a static binaries archive
      run: |
        mkdir -p dist
        SYS_PYTHON=python3 /opt/python-wasm-sdk/emsdk/upstream/emscripten/emar rcs dist/libpygame.a $(find build/temp.wasm32-*/ | grep o$)

    # Upload the generated files under github actions assets section
    - name: Upload dist
      uses: actions/upload-artifact@v4
      with:
        name: pygame-wasm-dist
        path: ./dist/*