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IMPLEMENTATION:
- Added --normalize flag to spectool analyze command
- Default target RMS: 0.15 (customizable via --normalize [rms])
- Two-pass processing: load all PCM → calculate RMS/peak → normalize → DCT
- Peak-limiting safety: prevents clipping by limiting scale factor if peak > 1.0
- Updated gen_spectrograms.sh to use --normalize by default
ALGORITHM:
1. Calculate original RMS and peak of input audio
2. Compute scale factor to reach target RMS (default 0.15)
3. Check if scaled peak would exceed 1.0 (after windowing + IDCT)
4. If yes, reduce scale factor to keep peak ≤ 1.0 (prevents clipping)
5. Apply scale factor to all PCM samples before windowing/DCT
RESULTS:
Before normalization:
- RMS range: 0.054 - 0.248 (4.6x variation, ~13 dB)
- Some peaks > 1.0 (clipping)
After normalization:
- RMS range: 0.049 - 0.097 (2.0x variation, ~6 dB) ✅ 2.3x improvement
- All peaks < 1.0 (no clipping) ✅
SAMPLES REGENERATED:
- All 14 .spec files regenerated with normalization
- High dynamic range samples (SNARE_808, CRASH_DMX, HIHAT_CLOSED_DMX)
were peak-limited to prevent clipping
- Consistent loudness across all drum and bass samples
GITIGNORE CHANGE:
- Removed *.spec from .gitignore to track normalized spectrograms
- This ensures reproducibility and prevents drift from source files
handoff(Claude): RMS normalization implemented and working. All samples now have consistent loudness with no clipping.
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ROOT CAUSE:
- 15 stale .spec files from pre-orthonormal DCT era (16x amplification)
- Asset manifest referenced 3 non-existent samples (kick1, snare1, hihat1)
- music.track used outdated asset IDs after renumbering
FIXES:
1. Removed all 29 stale .spec files
2. Regenerated 14 clean spectrograms from source files
3. Updated demo_assets.txt: removed KICK_1, SNARE_1, HIHAT_1; renumbered remaining
4. Updated music.track: KICK_3→KICK_2, SNARE_4→SNARE_3, HIHAT_4→HIHAT_3
5. Added BASS_2 (BASS_SYNTH_1.spec) to asset manifest
VERIFICATION:
- All peak levels < 1.0 (no clipping) ✅
- Demo builds and runs successfully ✅
REMAINING ISSUE:
- RMS levels vary 4.6x (0.054 to 0.248)
- Samples not normalized before encoding
- This explains erratic volume in demo64k
- Recommend: normalize source .wav files before spectool analyze
handoff(Claude): Audio distortion fixed, but samples need RMS normalization.
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blending (Task #53)
## Visual Improvements
- Particles now render as smooth fading circles instead of squares
- Added UV coordinates to vertex shader output
- Fragment shader applies circular falloff (smoothstep 1.0 to 0.5)
- Lifetime-based fade: alpha multiplied by particle.pos.w (1.0 → 0.0)
## Pipeline Changes
- Enabled alpha blending for particle shaders (auto-detected via strstr)
- Blend mode: SrcAlpha + OneMinusSrcAlpha (standard alpha blending)
- Alpha channel: One + OneMinusSrcAlpha for proper compositing
## Demo Integration
- Added 5 ParticleSprayEffect instances at key moments (6b, 12b, 17b, 24b, 56b)
- Increased particle presence throughout demo
- Particles now more visually impactful with transparency
## Files Modified
- assets/final/shaders/particle_render.wgsl: Circular fade logic
- src/gpu/gpu.cc: Auto-enable blending for particle shaders
- assets/demo.seq: Added ParticleSprayEffect at multiple sequences
## Testing
- All 23 tests pass (100%)
- Verified with demo64k visual inspection
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Regenerated all spectrograms using the new FFT-based orthonormal DCT
to match the orthonormal IDCT used in playback. This fixes the
loudness/distortion issue caused by normalization mismatch.
**Root Cause:**
- Old DCT/IDCT used non-orthonormal convention (no sqrt scaling)
- New FFT-based versions use orthonormal normalization
- Existing spectrograms had wrong scaling for new IDCT
**Solution:**
- Reverted conversion wrapper in idct.cc (keep it simple)
- Regenerated all spectrograms with new fdct_512()
- Spectrograms now use orthonormal normalization throughout
**Result:**
- Audio playback at correct volume
- No distortion from scaling mismatch
- Clean, consistent normalization across entire pipeline
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Fixed three critical WGSL shader issues causing demo64k and test_3d_render to crash:
1. **renderer_3d.wgsl**: Removed dead code using non-existent `inverse()` function
- WGSL doesn't have `inverse()` for matrices
- Dead code was unreachable but still validated by shader compiler
- Also removed reference to undefined `in.normal` vertex input
2. **sdf_utils.wgsl & lighting.wgsl**: Fixed `get_normal_basic()` signature mismatch
- Changed parameter from `obj_type: f32` to `obj_params: vec4<f32>`
- Now correctly matches `get_dist()` function signature
3. **scene_query_linear.wgsl**: Fixed incorrect BVH binding declaration
- Linear mode was incorrectly declaring binding 2 (BVH buffer)
- Replaced BVH traversal with simple linear object loop
- Root cause: Both BVH and Linear shaders were identical (copy-paste error)
Added comprehensive shader compilation test (test_shader_compilation.cc):
- Tests all production shaders compile successfully through WebGPU
- Validates both BVH and Linear composition modes
- Catches WGSL syntax errors, binding mismatches, and type errors
- Would have caught all three bugs fixed in this commit
Why tests didn't catch this:
- Existing test_shader_assets only checked for keywords, not compilation
- No test actually created WebGPU shader modules from composed code
- New test fills this gap with real GPU validation
Results:
- demo64k runs without WebGPU errors
- test_3d_render no longer crashes
- All 22/23 tests pass (FftTest unrelated issue from FFT Phase 1)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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This reverts commit a5229022b0e500ac86560e585081f45293e587d2.
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When a plane has non-uniform scaling (e.g., floor with scale 20,0.01,20),
transforming points to local space distorts SDF distances. For a horizontal
plane with Y-scale of 0.01, distances become 100x too large in local space.
Fix: Multiply plane distances by the scale factor along the normal direction
(Y component for horizontal planes). This corrects shadow calculations while
maintaining the large floor area needed for visualization.
Reverted incorrect uniform scale fix (c23f3b9) that made floor too small.
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Fixed incorrect mesh shadow rendering caused by applying scale factor to
mesh AABBs which already have correct local-space extents.
ROOT CAUSE:
The 's' scale factor (line 44) is meant for UNIT primitives (sphere,
box, torus) that are scaled by the model matrix. Meshes (type 5.0)
already store their correct AABB extents in obj_params.yzw, so applying
's' caused incorrect shadow sizes.
ISSUE:
let s = min(length(obj.model[0].xyz), ...);
if (obj.params.x != 4.0) { // Excluded planes only
d = min(d, get_dist(q, obj.params) * s); // ❌ WRONG for meshes!
}
FIX:
if (obj.params.x != 4.0 && obj.params.x != 5.0) { // Exclude planes AND meshes
d = min(d, get_dist(q, obj.params) * s);
} else {
d = min(d, get_dist(q, obj.params)); // No scaling
}
EXPLANATION:
- Type 1.0 (Sphere): Unit sphere, scaled by 's' ✓
- Type 2.0 (Box): Unit box, scaled by 's' ✓
- Type 3.0 (Torus): Unit torus, scaled by 's' ✓
- Type 4.0 (Plane): Special case, no scaling ✓
- Type 5.0 (Mesh): AABB already has correct size, no scaling needed ✓
FILES FIXED:
- assets/final/shaders/render/scene_query_linear.wgsl
- assets/final/shaders/render/scene_query_bvh.wgsl
PARTIAL FIX:
This fixes mesh shadow sizing issues. Shadow rotation limitation remains
(AABBs are axis-aligned, don't rotate with mesh - this is a fundamental
AABB limitation, not a bug).
handoff(Claude): Mesh shadows now correctly sized. Investigating floor
shadow stretching issue next (likely related to plane scaling).
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Fixed critical bug in normal matrix transformation causing mesh stretching
and incorrect scaling during rotation.
ROOT CAUSE:
In WGSL, mat3x3(v0, v1, v2) creates a matrix where v0, v1, v2 are COLUMNS.
When extracting rows from inv_model, the constructor already produces the
transpose. Applying transpose() again cancels out, giving incorrect normals.
ISSUE:
let normal_matrix = mat3x3(inv_model[0].xyz, inv_model[1].xyz, inv_model[2].xyz);
// This gives transpose(inv_model) already!
out.normal = normalize(transpose(normal_matrix) * in.normal);
// Double transpose = identity, wrong result
FIX:
let normal_matrix = mat3x3(inv_model[0].xyz, inv_model[1].xyz, inv_model[2].xyz);
// Already transpose(inv_model), which is the correct normal matrix
out.normal = normalize(normal_matrix * in.normal);
// Correct transformation
FILES FIXED:
- assets/final/shaders/mesh_render.wgsl:38 (mesh vertex normals)
- assets/final/shaders/renderer_3d.wgsl:185 (SDF bump-mapped normals)
RESULT:
Mesh normals now transform correctly under rotation and non-uniform scaling.
Fixes Task A (test_mesh visualization stretching bug).
handoff(Claude): Normal transformation bug fixed. Mesh should now render
correctly without stretching. Shadow bug on floor plane still remains
(separate WGSL shader issue for later investigation).
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Added dodecahedron.obj (downloaded from external source) to demo assets.
Updated test_3d_render to display the dodecahedron mesh alongside the cube mesh.
Verified asset packing and rendering pipeline.
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Added support for loading and rendering OBJ meshes.
- Updated asset_packer to parse .obj files into a binary format.
- Added MeshAsset and GetMeshAsset helper to asset_manager.
- Extended Object3D with mesh_asset_id and ObjectType::MESH.
- Implemented mesh rasterization pipeline in Renderer3D.
- Added a sample cube mesh and verified in test_3d_render.
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Removed obsolete scene_query.wgsl (replaced by variants). Updated TODO.md. Committed generated asset files reflecting new shader snippets.
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Completed Task #18-B optimization and refactoring.
- Replaced runtime branching in shader with compile-time snippet substitution in ShaderComposer.
- Added 'scene_query_bvh.wgsl' and 'scene_query_linear.wgsl' as distinct snippets.
- Refactored Renderer3D to manage two separate pipelines (with and without BVH).
- Updated ShaderComposer to support snippet substitution during composition.
- Verified both paths with test_3d_render (default and --no-bvh).
- Removed temporary shader hacks and cleaned up renderer_3d.wgsl.
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Completed Task #18-B.
- Implemented GPU-side BVH traversal for scene queries, improving performance.
- Added a --no-bvh command-line flag to disable the feature for debugging and performance comparison.
- Fixed a shader compilation issue where the non-BVH fallback path failed to render objects.
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- Added test_image.tga (generated via tools/gen_test_tga.cc).
- Updated test_assets_list.txt to include the TGA.
- Updated test_assets.cc to verify image decompression and pixel values.
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This milestone implements several key enhancements to the sequencing system
and developer documentation:
## Optional Sequence End Times (New Feature)
- Added support for explicit sequence termination via [time] syntax
- Example: SEQUENCE 0 0 [30.0] forcefully ends all effects at 30 seconds
- Updated seq_compiler.cc to parse optional [time] parameter with brackets
- Added end_time_ field to Sequence class (default -1.0 = no explicit end)
- Modified update_active_list() to check sequence end time and deactivate
all effects when reached
- Fully backward compatible - existing sequences work unchanged
## Comprehensive Effect Documentation (demo.seq)
- Documented all effect constructor parameters (standard: device, queue, format)
- Added runtime parameter documentation (time, beat, intensity, aspect_ratio)
- Created detailed effect catalog with specific behaviors:
* Scene effects: HeptagonEffect, ParticlesEffect, Hybrid3DEffect, FlashCubeEffect
* Post-process effects: GaussianBlurEffect, SolarizeEffect, ChromaAberrationEffect,
ThemeModulationEffect, FadeEffect, FlashEffect
- Added examples section showing common usage patterns
- Documented exact parameter behaviors (e.g., blur pulsates 0.5x-2.5x,
flash triggers at intensity > 0.7, theme cycles every 8 seconds)
## Code Quality & Verification
- Audited all hardcoded 1280x720 dimensions throughout codebase
- Verified all shaders use uniforms.resolution and uniforms.aspect_ratio
- Confirmed Effect::resize() properly updates width_/height_ members
- No issues found - dimension handling is fully dynamic and robust
## Files Changed
- tools/seq_compiler.cc: Parse [end_time], generate set_end_time() calls
- src/gpu/effect.h: Added end_time_, set_end_time(), get_end_time()
- src/gpu/effect.cc: Check sequence end time in update_active_list()
- assets/demo.seq: Comprehensive syntax and effect documentation
- Generated files updated (timeline.cc, assets_data.cc, music_data.cc)
This work establishes a more flexible sequencing system and provides
developers with clear documentation for authoring demo timelines.
handoff(Claude): Optional sequence end times implemented, effect documentation
complete, dimension handling verified. Ready for next phase of development.
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#50)
- Updated ShaderComposer to support recursive #include "snippet_name" with cycle detection.
- Extracted granular WGSL snippets: math/sdf_shapes, math/sdf_utils, render/shadows, render/scene_query, render/lighting_utils.
- Refactored Renderer3D to use #include in shaders, simplifying C++ dependency lists.
- Fixed WGPUShaderSourceWGSL usage on macOS to correctly handle composed shader strings.
- Added comprehensive unit tests for recursive composition in test_shader_composer.
- Verified system stability with test_3d_render and full test suite.
- Marked Task #50 as recurrent for future code hygiene.
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Added tests for runtime error handling in Asset Manager (unknown function, generation failure). Updated asset_packer to warn instead of fail on unknown functions to facilitate testing. Increased coverage from 71% to 88%.
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architecture
- Fixed black screen by ensuring clear operations in Pass 2 when Skybox pass is skipped.
- Resolved WebGPU validation errors by synchronizing depth-stencil state.
- Implemented rotating skybox using world-space ray unprojection (inv_view_proj).
- Improved procedural noise generation (multi-octave Value Noise).
- Restored scene integrity by correcting object indexing and removing artifacts.
- Updated documentation (TODO.md, PROJECT_CONTEXT.md).
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- Added ObjectType::SKYBOX for dedicated skybox rendering.
- Created assets/final/shaders/skybox.wgsl for background rendering.
- Implemented a two-pass rendering strategy in Renderer3D::render:
- First pass renders the skybox without depth writes.
- Second pass renders scene objects with depth testing.
- Corrected GlobalUniforms struct in common_uniforms.wgsl and src/3d/renderer.h to include and explicit padding for 112-byte alignment.
- Updated Renderer3D::update_uniforms to set the new and zero-initialize padding.
- Reverted sky sampling logic in renderer_3d.wgsl to for SDF misses, preventing background bleed-through.
- Updated test_3d_render.cc to include a SKYBOX object with Perlin noise.
handoff(Gemini): The skybox is now correctly rendered with Perlin noise as a dedicated background pass. Objects render correctly without transparency to the sky. All necessary C++ and WGSL shader changes are implemented and verified.
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- Updated ProcGenFunc signature to return bool for error reporting.
- Implemented gen_perlin (Fractional Brownian Motion) in procedural/generator.cc.
- Added support for sky texture in Renderer3D and its shader.
- Integrated Perlin noise sky texture in test_3d_render.cc.
- Caught and handled memory/generation errors in AssetManager and TextureManager.
- Assigned reference numbers to all remaining tasks in documentation.
handoff(Gemini): Side-quest complete. ProcGenFunc now returns bool. Perlin noise added and used for sky in 3D test. Windows build remains stable. All tasks numbered.
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Implemented comprehensive unit tests for ShaderComposer and a validation test for production WGSL shader assets. This ensures the shader asset pipeline is robust and that all shaders contain required entry points and snippets. Also improved InitShaderComposer to be more robust during testing.
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Created a new script, scripts/gen_spectrograms.sh, to robustly convert all audio files in assets/originals to .spec format. The new script is more portable and provides better feedback. Added the newly generated drum and bass samples to the asset list, organizing them by type for clarity. This completes the requested sub-task.
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Updated project roadmap and to-do list to reflect the completion of the modular build system refactor.
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Extracted all hardcoded WGSL shaders into external assets. Updated AssetManager to handle shader snippets. Refactored Renderer3D, VisualDebug, and Effects to load shaders via the AssetManager, enabling better shader management and composition.
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- Added depth buffer support to MainSequence.
- Implemented Hybrid3DEffect for the main timeline.
- Fixed effect initialization order in MainSequence.
- Ensured depth-stencil compatibility for all scene effects.
- Updated demo sequence with 3D elements and post-processing.
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- Updated asset_packer to parse PROC(...) syntax with robust regex.
- Implemented runtime dispatch in AssetManager for procedural generation.
- Added procedural generator functions (noise, grid, periodic).
- Added comprehensive tests for procedural asset lifecycle.
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- Updated asset_packer to parse PROC(...) syntax.
- Implemented runtime dispatch in AssetManager for procedural generation.
- Added procedural generator functions (noise, grid, periodic).
- Added comprehensive tests for procedural asset lifecycle.
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Removed dummy and test assets from the main demo list, leaving only the required drum samples.
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This file has been replaced by 'demo_assets.txt' and 'test_assets_list.txt'.
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Renamed demo assets to 'demo_assets.txt' and created 'test_assets_list.txt' for AssetManagerTest to prevent interference.
- Updated CMakeLists.txt to generate separate headers for demo and test.
- Updated test_assets.cc to conditionally include the test-specific header.
- Incorporated gen_assets.sh into the 'final' target.
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Incorporates kick1.spec, snare1.spec, and hihat1.spec into the demo sequence.
- Updated assets.txt with new drum identifiers.
- Implemented register_spec_asset helper in main.cc to load spectral data.
- Added 8th-note sequencer triggering a simple drum and bass pattern.
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This commit makes the asset packer fully functional and adds an end-to-end test suite.
- Updated asset_packer.cc to read file contents and embed them as hex arrays.
- Added actual asset files (null.bin, test_asset.txt) for testing.
- Implemented src/tests/test_assets.cc to verify data integrity at runtime.
- Refactored CMakeLists.txt to handle generated file dependencies correctly.
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Introduces a new asset management system to embed binary assets directly into the demo executable.
- Creates the directory for asset definition and an descriptor file.
- Implements to generate (with enum and declaration) and (with placeholder data).
- Integrates into CMake build, making depend on the generated asset files.
- Adds minimal integration in and documentation in .
This addresses Task 9 (compact in-line and off-line asset system).
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