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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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spectool was missing from DemoTools.cmake; scripts/gen_spectrograms.sh
could not find build/spectool. Document the regeneration workflow in HOWTO.md.
handoff(Claude): spectool now builds with -DDEMO_BUILD_TOOLS=ON
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- Remove tools/seq_compiler.cc (replaced by seq_compiler.py)
- Remove C++ seq_compiler build target from cmake/DemoTools.cmake
- Update documentation to remove Gantt chart mentions
- Keep seq_compiler.py (active Python compiler)
- All tests passing (34/34)
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Complete v1→v2 migration cleanup: rename 29 files (sequence_v2→sequence, effect_v2→effect, 14 effect files, 8 shaders, compiler, docs), update all class names and references across 54 files. Archive v1 timeline. System now uses standard naming with all versioning removed. 30/34 tests passing.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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- Update main workspace to use timeline_v2.seq
- Add SEQ_COMPILER_V2 using Python script (seq_compiler_v2.py)
- Update DemoCodegen to use v2 compiler for main timeline
- Add v1 compatibility stubs (LoadTimeline, GetDemoDuration)
- Demo builds and links successfully
- All tests passing (36/36)
V2 timeline now integrated into build pipeline. Stub functions allow
linking while proper MainSequence v2 integration is pending.
handoff(Claude): V2 timeline integrated, ready for effect ports
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Refactor monolithic 866-line CMakeLists.txt into 54-line orchestrator + 10 modules:
- DemoOptions.cmake - Build option declarations
- DemoConfig.cmake - Option implications and platform detection
- DemoCommon.cmake - Shared macros (conditional sources, size opts, linking)
- DemoDependencies.cmake - External library discovery (WGPU, GLFW)
- DemoSourceLists.cmake - Conditional source file lists
- DemoLibraries.cmake - Subsystem library targets
- DemoTools.cmake - Build tools (asset_packer, compilers)
- DemoCodegen.cmake - Code generation (assets, timeline, music)
- DemoExecutables.cmake - Main binaries (demo64k, test_demo)
- DemoTests.cmake - Test infrastructure (36 tests)
- Validation.cmake - Uniform buffer validation
Benefits:
- 94% reduction in main file size (866 → 54 lines)
- Conditional module inclusion (tests only parsed if DEMO_BUILD_TESTS=ON)
- Shared macros eliminate 200+ lines of repetition
- Clear separation of concerns
All 36 tests passing. All build modes verified.
Documentation: Created doc/CMAKE_MODULES.md with module architecture.
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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