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openspec/changes/enterprise-gaming-r3f-audio/proposal.md
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openspec/changes/enterprise-gaming-r3f-audio/proposal.md
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# OpenSpec Change: enterprise-gaming-r3f-audio
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- **Change ID**: enterprise-gaming-r3f-audio
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- **Package**: `@suaveplan/r3f-audio`
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- **Category**: gaming
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- **Target path**: `packages/gaming/r3f-audio`
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- **Status**: PROPOSED
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- **Date**: 2026-05-15
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- **Design**: `./design.md`
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- **Spec delta**: `./specs/r3f-audio/spec.md`
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> Replaces the prior 2026-04-24 draft that was flagged `NEEDS-REWRITE`. See `../REACT_AUDIO_WAVE_REWRITE_COMPLETE.md`.
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---
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## Summary
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Deliver `@suaveplan/r3f-audio` on genesis from scratch at enterprise quality. The package is the React-Three-Fiber surface for the unified audio architecture: it composes the four game-audio building blocks shipped by `@suaveplan/audio-plugins-fx` (`SpatialPositionalPlugin`, `ProximityVoicePlugin`, `MusicLayerMixerPlugin`, `VoiceTransformPlugin`) into R3F components that bridge the Three.js scene graph to the universal `AmbientState` system:
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1. **`<AudioListener>`** — attaches to a Three.js camera (or any `Object3D`) and pushes its world-space position / orientation / velocity into the active `PluginChain`'s `AmbientState.listener` every frame, so every plugin in every chain reads consistent listener state.
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2. **`<PositionalAudio>`** — wraps a `SpatialPositionalPlugin` instance and syncs its `position` parameter to a Three.js `Object3D`'s world-space transform; HRTF on browsers that support it, amplitude panning + distance attenuation universally.
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3. **`<ProximityVoiceChat>`** — wraps a `ProximityVoicePlugin` instance; routes a participant's voice stream through it with distance-based attenuation against the active listener.
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4. **`<MusicLayerMixer>`** — wraps a `MusicLayerMixerPlugin`; binds the layer-weight map to a React-controlled `gameState` prop (e.g. `{ tension, exploration, combat, stealth }`) that updates `AmbientState.extension.gameState` on every change with smooth crossfade.
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5. **`<VoiceTransform>`** — wraps a `VoiceTransformPlugin` for character voice morphing on NPC dialogue lines.
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6. **`<OcclusionProvider>`** — uses `Raycaster` against scene meshes to compute per-source attenuation when geometry sits between source and listener; pushes occlusion factor into the spatial plugin via its `occlusionDb` parameter.
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7. **A typed hook layer** — `useAudioListener()`, `usePositionalAudio(ref)`, `useMusicLayerWeights(weights)`, `useProximityVoice(participantId)`, `useOcclusion(source, target)`.
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The package contains **no DSP, no audio context, no plugin instance state** — every audio surface is delegated to `@suaveplan/audio-plugins-fx`. R3F components own the scene-graph-to-ambient-state bridge and React lifecycle; the plugins own the audio.
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---
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## Current-state audit (genesis)
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The package does not exist on genesis yet — fresh build replacing the obsolete pre-tier 2026-04-24 draft. The prior upstream `packages/gaming/effects/r3f-audio/` is built on raw Web Audio `PannerNode` and `AudioListener`, with no integration into the universal `AmbientState` system or the game-audio building blocks; this rewrite consumes the building blocks instead so all audio behaviours are universal and the R3F surface is purely the scene-graph bridge.
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---
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## Parity Checklist (vs upstream)
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| Capability | Upstream | Migrated | Notes |
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|---|:---:|:---:|---|
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| `AudioListener` component | ✅ | ⬆️ | Now pushes listener pose into `AmbientState.listener` for every chain in the active provider, not just one panner. |
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| `PositionalAudio` component | ✅ | ⬆️ | Now wraps `SpatialPositionalPlugin` (which supports both HRTF and universal amplitude panning). |
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| Pool of `AudioSource` objects | ✅ | ✅ | Internal voice pooling; instance reuse across mount/unmount. |
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| Occlusion estimator | ✅ | ⬆️ | Now writes into the plugin's declared `occlusionDb` parameter via `setParameterCurve` for smooth transitions. |
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| Dynamic music layers | – | ⬆️ | NEW: `<MusicLayerMixer>` over `MusicLayerMixerPlugin` with React-controlled `gameState`. |
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| Proximity voice chat | – | ⬆️ | NEW: `<ProximityVoiceChat>` over `ProximityVoicePlugin`. |
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| Character voice transformation | – | ⬆️ | NEW: `<VoiceTransform>` over `VoiceTransformPlugin`. |
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| OTel active-source gauge | ✅ | ✅ | Preserved from upstream additions. |
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| Structured errors | ⚠ partial | ✅ | `R3F_AUDIO.*` codes via `defineCodes`. |
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| Coverage | ~78 % | ✅ | 100/100/100/100. |
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No 🚫 rows.
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---
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## Available workspace deps on genesis
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| Package | Role |
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|---|---|
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| `@suaveplan/audio-plugins-fx` (`workspace:^`) | Four game-audio building blocks consumed as plugins |
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| `@suaveplan/react-audio` (`workspace:^`) | `AudioProvider` + hooks for chain / plugin / transport access |
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| `@suaveplan/audio-transport` (`workspace:^`) | Transport reference for tempo-synced music layers |
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| `@suaveplan/error` (`workspace:^`) | `defineCodes` + `AudioError` |
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| `@suaveplan/types` (`workspace:^`) | `LoggerLike`, `Vec3`, `Quat` |
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| `@suaveplan/opentelemetry` (`workspace:^`) | OTel gauges |
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| `react` (`peerDependency`) | React 19 peer |
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| `@react-three/fiber` (`peerDependency`) | R3F peer |
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| `three` (`peerDependency`) | Three.js peer |
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| `zod` (`catalog:forms`) | Options validation |
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---
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## File layout
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```text
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packages/gaming/r3f-audio/
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src/
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index.ts
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error-codes.ts (+ .test.ts .md)
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components/
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audio-listener/ (.tsx .md .types.ts .test.tsx .stories.tsx)
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positional-audio/ ...
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proximity-voice-chat/ ...
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music-layer-mixer/ ...
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voice-transform/ ...
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occlusion-provider/ ...
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hooks/
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use-audio-listener/ (.ts .md .test.tsx)
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use-positional-audio/ ...
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use-music-layer-weights/ ...
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use-proximity-voice/ ...
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use-occlusion/ ...
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util/
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pose-to-ambient/ (.ts .md .types.ts .test.ts)
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raycaster-pool/ ...
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__benchmarks__/
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pose-sync.bench.ts
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occlusion.bench.ts
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tests/
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integration.test.tsx
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purity.test.ts
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exports.test.ts
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e2e/
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spatial.spec.ts
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```
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---
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## Impact
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**Breaking changes**: none — fresh build.
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**Prerequisites**: `audio-plugins-fx`, `react-audio`, `audio-transport`, `error`, `types`, `opentelemetry`.
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### Affected dependents
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No dependents in this batch (verified by `bunx turbo ls --filter=...@suaveplan/r3f-audio`). Future game packages will consume this surface and SHALL run its tests on change per `openspec/AGENTS.md` §13 step 10.
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