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Add SoundBuffer type: procedural audio, sfxr synthesis, DSP effects

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New SoundBuffer Python type enables procedural audio generation:
- Tone synthesis (sine, square, saw, triangle, noise) with ADSR envelopes
- sfxr retro sound effect engine (7 presets, 24 params, mutation, seeding)
- DSP effects chain: pitch_shift, low/high pass, echo, reverb,
  distortion, bit_crush, normalize, reverse, slice
- Composition: concat (with crossfade overlap) and mix
- Sound() now accepts SoundBuffer or filename string
- Sound gains pitch property and play_varied() method
- Platform stubs for HeadlessTypes and SDL2Types (loadFromSamples, pitch)
- Interactive demo: sfxr clone UI + Animalese speech synthesizer
- 62 unit tests across 6 test files (all passing)

Refs #251

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
John McCardle 2026-02-19 18:57:20 -05:00
commit 97dbec9106
20 changed files with 4793 additions and 197 deletions
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1
CMakeLists.txt
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@ -57,6 +57,7 @@ include_directories(${CMAKE_SOURCE_DIR}/src/3d)
include_directories(${CMAKE_SOURCE_DIR}/src/platform)
include_directories(${CMAKE_SOURCE_DIR}/src/tiled)
include_directories(${CMAKE_SOURCE_DIR}/src/ldtk)
include_directories(${CMAKE_SOURCE_DIR}/src/audio)
include_directories(${CMAKE_SOURCE_DIR}/modules/RapidXML)
include_directories(${CMAKE_SOURCE_DIR}/modules/json/single_include)