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feat(webgl): Add WebGL GAL test infrastructure (Phase 1)

Browse source 
Add complete test infrastructure for WebGL GAL visual regression testing:

- scripts/test-gal-regression.sh: Master script that builds both backends,
  runs tests, and performs two-level comparison (native vs baseline,
  webgl vs native)
- scripts/build-gal-webgl-test.sh: WASM build using Makefile with em++
- tests/gal-regression/wasm/: WebGL test harness (stub WEBGL_GAL)
- tests/e2e/gal-webgl.spec.ts: Playwright test for screenshot capture

Fix Homebrew Emscripten environment in scripts/common/env.sh:
- Set EMSDK_PYTHON for Python 3.10+ (em++ reads this, not $PYTHON)
- Add bundled LLVM to PATH (Emscripten needs its clang with WASM backend)

Verified: Native vs Baseline passes (28/28), WebGL generates blank
screenshots as expected (WEBGL_GAL implementation is Phase 2).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This commit is contained in:
Viktor Vaczi 2026-01-07 16:11:31 +01:00
commit a4f444fea8
10 changed files with 1401 additions and 0 deletions
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43
scripts/common/env.sh
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@ -36,6 +36,49 @@ export WX_BUILD="$BUILD_ROOT/wxwidgets-universal"
# Emscripten settings
export EMSDK_QUIET=1
# Homebrew Emscripten configuration
# The em++ script uses EMSDK_PYTHON (not PYTHON env var) for the Python interpreter
# and finds clang via PATH - Emscripten bundles its own LLVM with WebAssembly support
if [[ -d "/opt/homebrew/Cellar/emscripten" ]]; then
_EM_VERSION=$(ls /opt/homebrew/Cellar/emscripten/ | sort -V | tail -1)
_EM_LLVM_BIN="/opt/homebrew/Cellar/emscripten/$_EM_VERSION/libexec/llvm/bin"
if [[ -d "$_EM_LLVM_BIN" ]]; then
# Add bundled LLVM to PATH so Emscripten finds its clang (not /usr/bin/clang)
export PATH="$_EM_LLVM_BIN:$PATH"
fi
elif [[ -d "/usr/local/Cellar/emscripten" ]]; then
_EM_VERSION=$(ls /usr/local/Cellar/emscripten/ | sort -V | tail -1)
_EM_LLVM_BIN="/usr/local/Cellar/emscripten/$_EM_VERSION/libexec/llvm/bin"
if [[ -d "$_EM_LLVM_BIN" ]]; then
export PATH="$_EM_LLVM_BIN:$PATH"
fi
fi
# Emscripten 4.0.22+ requires Python 3.10+ (uses match statement and type union syntax)
# The em++ shell script checks EMSDK_PYTHON first, then falls back to `which python3`
# Set EMSDK_PYTHON to Homebrew's Python to ensure correct version is used
if [[ -d "/opt/homebrew/opt/python@3.14/bin" ]]; then
export EMSDK_PYTHON="/opt/homebrew/opt/python@3.14/bin/python3.14"
elif [[ -d "/opt/homebrew/opt/python@3.13/bin" ]]; then
export EMSDK_PYTHON="/opt/homebrew/opt/python@3.13/bin/python3.13"
elif [[ -d "/opt/homebrew/opt/python@3.12/bin" ]]; then
export EMSDK_PYTHON="/opt/homebrew/opt/python@3.12/bin/python3.12"
elif [[ -d "/opt/homebrew/opt/python@3.11/bin" ]]; then
export EMSDK_PYTHON="/opt/homebrew/opt/python@3.11/bin/python3.11"
elif [[ -d "/opt/homebrew/opt/python@3.10/bin" ]]; then
export EMSDK_PYTHON="/opt/homebrew/opt/python@3.10/bin/python3.10"
elif [[ -d "/usr/local/opt/python@3.14/bin" ]]; then
export EMSDK_PYTHON="/usr/local/opt/python@3.14/bin/python3.14"
elif [[ -d "/usr/local/opt/python@3.13/bin" ]]; then
export EMSDK_PYTHON="/usr/local/opt/python@3.13/bin/python3.13"
elif [[ -d "/usr/local/opt/python@3.12/bin" ]]; then
export EMSDK_PYTHON="/usr/local/opt/python@3.12/bin/python3.12"
elif [[ -d "/usr/local/opt/python@3.11/bin" ]]; then
export EMSDK_PYTHON="/usr/local/opt/python@3.11/bin/python3.11"
elif [[ -d "/usr/local/opt/python@3.10/bin" ]]; then
export EMSDK_PYTHON="/usr/local/opt/python@3.10/bin/python3.10"
fi
# Common compiler flags
export EMCC_CFLAGS="-fPIC -DEMSCRIPTEN"
export EMCC_CXXFLAGS="-fPIC -DEMSCRIPTEN -std=c++17"