.github/workflows/build-wasm.yml

name: CI (wasm)

on:
  workflow_dispatch: # allows manual triggering
  push:
    branches:
      - master
    paths: [
      '.github/workflows/build-wasm.yml',
      '**/CMakeLists.txt',
      '**/.cmake',
      '**/*.h',
      '**/*.hpp',
      '**/*.c',
      '**/*.cpp',
      '**/*.wgsl',
      '**/*.tmpl',
      'ggml/src/ggml-webgpu/wgsl-shaders/embed_wgsl.py'
    ]

  pull_request:
    types: [opened, synchronize, reopened]
    paths: [
      '.github/workflows/build-wasm.yml',
      '**/CMakeLists.txt',
      '**/.cmake',
      '**/*.h',
      '**/*.hpp',
      '**/*.c',
      '**/*.cpp',
      '**/*.wgsl',
      '**/*.tmpl',
      'ggml/src/ggml-webgpu/wgsl-shaders/embed_wgsl.py'
    ]

concurrency:
  group: ${{ github.workflow }}-${{ github.head_ref && github.ref || github.run_id }}
  cancel-in-progress: true

env:
  GGML_NLOOP: 3
  GGML_N_THREADS: 1
  LLAMA_ARG_LOG_COLORS: 1
  LLAMA_ARG_LOG_PREFIX: 1
  LLAMA_ARG_LOG_TIMESTAMPS: 1

jobs:
  ubuntu-webgpu:
    runs-on: ubuntu-24.04-arm

    steps:
      - name: Clone
        id: checkout
        uses: actions/checkout@v6

      - name: ccache
        uses: ggml-org/ccache-action@v1.2.21
        with:
          key: webgpu-ubuntu-24.04-arm-wasm
          evict-old-files: 1d
          save: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}

      - name: Install Emscripten
        run: |
          git clone https://github.com/emscripten-core/emsdk.git
          cd emsdk
          ./emsdk install latest
          ./emsdk activate latest

      - name: Fetch emdawnwebgpu
        run: |
          DAWN_TAG="v20260317.182325"
          EMDAWN_PKG="emdawnwebgpu_pkg-${DAWN_TAG}.zip"
          echo "Downloading ${EMDAWN_PKG}"
          curl -L -o emdawn.zip \
            "https://github.com/google/dawn/releases/download/${DAWN_TAG}/${EMDAWN_PKG}"
          unzip emdawn.zip

      - name: Build WASM WebGPU
        run: |
          source emsdk/emsdk_env.sh
          emcmake cmake -B build-wasm \
            -G "Ninja" \
            -DCMAKE_BUILD_TYPE=Release \
            -DGGML_WEBGPU=ON \
            -DGGML_OPENMP=OFF \
            -DLLAMA_OPENSSL=OFF \
            -DEMDAWNWEBGPU_DIR=emdawnwebgpu_pkg

          time cmake --build build-wasm --config Release --target test-backend-ops -j $(nproc)