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Adds src/util/ans.{h,cc}, a per-chunk-adaptive order-0 rANS entropy
coder. Decoder is always built; encoder is gated on ANS_ENABLE_ENCODER
(tools only). Both sides take an optional 256-entry initial_counts
table to seed the adaptive model.
The per-chunk initial state is (1 << kBits). Higher initial states
(e.g. with a signature packed into the upper bits) force a renorm-emit
at iter 0 that the decoder never consumes, corrupting multi-chunk
streams once stats become skewed.
Asset pipeline:
- AssetRecord gains 'compression' and 'uncompressed_size' fields.
- asset_packer scans every WGSL file to build a corpus-wide byte
histogram, then ANS-encodes each shader using that histogram as the
seed. Histogram and accessor are emitted alongside the asset table.
Round-trip verification runs at pack time for every compressed
asset; failures fall back to uncompressed storage.
- asset_manager decompresses on first GetAsset(), caches the
heap-allocated buffer, and DropAsset / ReloadAssetsFromFile free it
along with the procedural cache.
- Disk-load (dev) builds are unchanged: WGSL paths stay as filenames.
Tests:
- src/tests/util/test_ans.cc: roundtrip variants (empty, single byte,
single-symbol run, all-zeros, random uniform/skewed, repeated ASCII),
seeded-vs-uniform compression, rejection of mismatched counts /
corruption / truncation, PeekUncompressedSize.
- 37/37 dev, 36/36 STRIP_ALL.
Compression observed: WGSL shaders shrink to ~0.62-0.71x in the main
workspace (81 of 105 assets qualify).
Docs:
- doc/ANS.md (new): algorithm, bitstream, API, asset pipeline
integration, compression numbers, limitations, tests.
- doc/ASSET_SYSTEM.md: new Compression section + updated technical
guarantees for compressed assets.
- doc/COMPLETED.md: May 2026 entry.
- PROJECT_CONTEXT.md: Build status line mentions WGSL ANS compression.
- CLAUDE.md, GEMINI.md: tier-3 build doc list includes ANS.md.
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Add three new procedural texture generators:
- gen_plasma: classic sine-sum color texture (RGB output)
- gen_voronoi: Worley cellular noise (F1/F2/F2-F1 modes)
- gen_normalmap: post-process grayscale→RGB normal map
Remove gen_noise_256 (was an alias for gen_noise). Register new
generators in asset_manager and asset_packer. Add unit tests for
all three, and use them in test_3d_render (plasma sky, voronoi noise,
fBm normal map).
handoff(Gemini): plasma/voronoi/normalmap procedural generators added;
gen_noise_256 removed; tests + 3d_render usage wired up.
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Moved to to better organize test files.
Updated to reflect the new file location.
All tests pass after the move and build system update.
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Refactor duplicated test setup/teardown code into shared fixtures:
- test_math_helpers.h: Float comparison (test_near, test_near_vec3)
- AudioTestFixture: RAII wrapper for AudioEngine lifecycle
- EffectTestFixture: Combined WebGPU + AudioEngine + MainSequence
Migrated 9 test files (3 math, 6 audio) to use fixtures.
Net reduction: 54 LOC (178 insertions, 232 deletions).
All 34 tests passing.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Restructured test suite for better organization and targeted testing:
**Structure:**
- src/tests/audio/ - 15 audio system tests
- src/tests/gpu/ - 12 GPU/shader tests
- src/tests/3d/ - 6 3D rendering tests
- src/tests/assets/ - 2 asset system tests
- src/tests/util/ - 3 utility tests
- src/tests/common/ - 3 shared test helpers
- src/tests/scripts/ - 2 bash test scripts (moved conceptually, not physically)
**CMake changes:**
- Updated add_demo_test macro to accept LABEL parameter
- Applied CTest labels to all 36 tests for subsystem filtering
- Updated all test file paths in CMakeLists.txt
- Fixed common helper paths (webgpu_test_fixture, etc.)
- Added custom targets for subsystem testing:
- run_audio_tests, run_gpu_tests, run_3d_tests
- run_assets_tests, run_util_tests, run_all_tests
**Include path updates:**
- Fixed relative includes in GPU tests to reference ../common/
**Documentation:**
- Updated doc/HOWTO.md with subsystem test commands
- Updated doc/CONTRIBUTING.md with new test organization
- Updated scripts/check_all.sh to reflect new structure
**Verification:**
- All 36 tests passing (100%)
- ctest -L <subsystem> filters work correctly
- make run_<subsystem>_tests targets functional
- scripts/check_all.sh passes
Backward compatible: make test and ctest continue to work unchanged.
handoff(Gemini): Test reorganization complete. 36/36 tests passing.
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