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conventions
- Add textureSampleYUp() helper to fullscreen_uv_vs.wgsl to correct
y-flip when sampling WebGPU textures with y-up UV coordinates
- Use textureSampleYUp() in passthrough, gaussian_blur, combined_postprocess
- Fix skybox.wgsl: remove erroneous (1.0 - uv.y) flip (double-flip bug)
- Document world/view/screen conventions in doc/3D.md, camera_common.wgsl,
and fullscreen_uv_vs.wgsl
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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snippet
- src/shaders/render/scratch_lines.wgsl: reusable WGSL snippet registered as
"render/scratch_lines"; call scratch_lines(uv, resolution, time)->f32 from
any effect. Uses hash_1f from math/noise; 8 lines/frame, ~24fps flicker.
- src/effects/scratch.{wgsl,h,cc}: thin Scratch effect wrapping the snippet.
- Applied to "intro" and "rotating_cube" sequences as the final step.
- 35/35 tests passing.
handoff(Gemini): Scratch effect added. render/scratch_lines snippet is reusable.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Relocates shared WGSL shaders under src/ where all source code lives,
eliminating the top-level common/ directory.
- Update asset references in workspaces/main/assets.txt and workspaces/test/assets.txt
- Update docs: PROJECT_CONTEXT.md, ARCHITECTURE.md, WORKSPACE_SYSTEM.md, SHADER_REUSE_INVESTIGATION.md
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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