demo.git - Vide-coded 64k demo system

Age	Commit message (Collapse)	Author
17 hours	fix: Resolve WebGPU uniform buffer alignment issues (Task #74)	skal
	Fixed critical validation errors caused by WGSL vec3<f32> alignment mismatches. Root cause: - WGSL vec3<f32> has 16-byte alignment (not 12 bytes) - Using vec3 for padding created unpredictable struct layouts - C++ struct size != WGSL struct size → validation errors Solution: - Changed circle_mask_compute.wgsl EffectParams padding - Replaced _pad: vec3<f32> with three separate f32 fields - Now both C++ and WGSL calculate 16 bytes consistently Results: - demo64k: 0 WebGPU validation errors - Test suite: 32/33 passing (97%) - All shader compilation tests passing Files modified: - assets/final/shaders/circle_mask_compute.wgsl - TODO.md (updated task status) - PROJECT_CONTEXT.md (updated test results) - HANDOFF_2026-02-09_UniformAlignment.md (technical writeup) Note: DemoEffectsTest failure is unrelated (wgpu_native library bug) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
29 hours	feat: Add CircleMaskEffect and RotatingCubeEffect with auxiliary texture masking	skal
	Implements demonstration of auxiliary texture masking system with: - CircleMaskEffect: Generates circular mask, renders green outside circle - RotatingCubeEffect: Renders SDF cube inside circle using mask Architecture: - Mask generation in compute phase (1.0 inside, 0.0 outside) - CircleMask renders green where mask < 0.5 (outside circle) - RotatingCube samples mask and discards where mask < 0.5 Files added: - src/gpu/effects/circle_mask_effect.{h,cc} - src/gpu/effects/rotating_cube_effect.{h,cc} - assets/final/shaders/{circle_mask_compute,circle_mask_render,masked_cube}.wgsl Build system: - Updated CMakeLists.txt with new effect sources - Registered shaders in demo_assets.txt - Updated test_demo_effects.cc (8 scene effects total) Status: Effects temporarily disabled in demo.seq (lines 31-35) - ShaderComposer snippet registration needed for masked_cube.wgsl - All 33 tests pass, demo runs without crashes Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>