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- particles: stagger respawn y by golden-ratio index offset to break
per-row synchronization (100 particles per row fell in lock-step)
- heptagon: fix swapped atan2(x,y)->atan2(y,x) and WGSL % truncation
for negative angles (broke SDF for entire lower half of shape)
handoff(Gemini): heptagon now correct; particles desynchronized
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- Extract shared NTSC logic into render/ntsc_common.wgsl snippet
- sample_ntsc_signal() hook decouples input format from processing
- ntsc_rgb.wgsl: RGB input (converts via rgba_to_luma_chroma_phase)
- ntsc_yiq.wgsl: YIQ passthrough for RotatingCube output
- Add NtscYiq WgslEffect thin wrapper; register both in tests
handoff(Claude): NTSC refactor complete; NtscYiq ready for timeline use with RotatingCube.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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- math/color.wgsl: add rgba_to_yiqa, yiqa_to_rgba, rgba_to_luma_chroma_phase
- math/color_c64.wgsl: new file with C64 palette, Bayer 8x8, Dither()
- ntsc.wgsl: include both, remove local duplicates; Dither() now takes xsize/ysize
handoff(Claude): YIQ/dither helpers now reusable by other effects
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- Replace _dbg_pixel() with _dbg_char(ascii, r, c) covering
printable ASCII 0x20-0x7E (95 glyphs, C64-style 8x8 bitmaps)
- Update debug_f32() to use ASCII codes directly
- Add debug_str(col, pos, origin, s: vec4u, len) for rendering
up to 16 chars packed 4-per-u32 big-endian
handoff(Claude): debug_print now supports full ASCII strings.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Renders a f32 value (±999.999, 3 decimal digits) at a given screen
position using authentic C64 8x8 bitmap glyphs in yellow.
Usage: col = debug_f32(col, pos.xy, vec2f(10.0, 10.0), value);
Include: #include "debug/debug_print"
handoff(Gemini): new snippet at src/shaders/debug/debug_print.wgsl
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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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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