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2026-06-09 21:06:27 +01:00
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plugins/document-navigator/docs/media/audio-fx/audio-fx-plugin-game-audio/src/game-audio/game-audio.md
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@@ -72,12 +72,12 @@ game.cullDistantSources(80);
## Implementation Notes
The audio path is silent by design. Implementing the full mix of spatial sources + music layers + voice chat into a single mono output stream would require this plugin to embed three sibling-plugin engines (`SpatialAudioPlugin`, `MixerPlugin`, plus a voice-chat router) — which would either duplicate code or pull every plugin into this one's import graph. Instead, the plugin owns the *registry* of game-audio state; the browser engine reads that state via `createAudioNode()` and renders it into a Web Audio graph in a future revision. The universal block path produces silence but advances the internal sample clock so `isCrossfading` / `isBlending` work correctly under any renderer.
The audio path is silent by design. Implementing the full mix of spatial sources + music layers + voice chat into a single mono output stream would require this plugin to embed three sibling-plugin engines (`SpatialAudioPlugin`, `MixerPlugin`, plus a voice-chat router) — which would either duplicate code or pull every plugin into this one's import graph. Instead, the plugin owns the _registry_ of game-audio state; the browser engine reads that state via `createAudioNode()` and renders it into a Web Audio graph in a future revision. The universal block path produces silence but advances the internal sample clock so `isCrossfading` / `isBlending` work correctly under any renderer.
Crossfade scheduling stores the start sample (`processedSamples` at the time of the call) plus the duration in samples. `isCrossfading` is `elapsed < durationSamples`. The check is exact at the sample level — the test "isCrossfading true immediately; false after enough samples processed" exercises that by processing exactly the configured number of samples.
`cullDistantSources` walks the spatial-source map and deletes entries whose distance to the listener exceeds the threshold. The cost is `O(numSources)` per call; for the typical game-audio case (under 100 sources) this is below 1 ms even at 60 fps cull frequency. A spatial-hash variant would amortise this to `O(log n)` but adds bookkeeping that the MVP does not need.
`optimizeVoiceChatBandwidth` returns a coarse 0..3 tier rather than per-participant codec parameters because the actual codec selection lives in the transport layer (WebRTC / similar). The plugin's job is to *advise*; the transport applies the advice. Currently the heuristic is just a participant-count threshold (>8 ⇒ level 3, otherwise level 1) — a future revision can layer on signal-strength and ping data.
`optimizeVoiceChatBandwidth` returns a coarse 0..3 tier rather than per-participant codec parameters because the actual codec selection lives in the transport layer (WebRTC / similar). The plugin's job is to _advise_; the transport applies the advice. Currently the heuristic is just a participant-count threshold (>8 ⇒ level 3, otherwise level 1) — a future revision can layer on signal-strength and ping data.
The plugin maintains an internal `processedSamples` counter incremented by `output.length` each `processBlock`. This is the same clock crossfade and effect-blend countdowns reference — using `BlockContext.blockOffsetSamples` directly would not work because the chain may slice or align blocks differently, and the consumer expects clock advancement per actual rendered sample. The counter resets on `setup`/`reset`.