- Add comprehensive README documenting all 28 GAL test scenarios
- Document known limitation: DrawBitmap uses legacy OpenGL immediate
mode (glBegin/glEnd) incompatible with shader-based test harness
- Add shader accessor for DrawBitmap workaround attempt
- Clean up debug code from bitmap scenario
The DrawBitmap limitation is acceptable because:
- It's primarily used for reference images in schematics
- WebGL port will need its own bitmap rendering implementation
- All other 69 GAL methods are fully tested
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
