117 lines
3.3 KiB
JavaScript
117 lines
3.3 KiB
JavaScript
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/**
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* ShapeSeq session state serialization.
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*
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* Captures and restores the complete ShapeSeq state:
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* - Chain configuration (which primitives, in what order)
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* - Primitive states (e.g., PitchWalker position)
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* - Generator combine mode
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* - Projection config (3 knobs)
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* - Voice mode (mono/poly)
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* - Sequence MLP weights (if in dual mode)
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* - Freeze state (mode, frozen params, live flags, seeds)
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* - Clock config (BPM, step count)
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*
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* @module shapeseq/session
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*/
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import { PRIMITIVE_REGISTRY } from './primitives.js';
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/**
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* Serialize ShapeSeq engine state to a plain object (JSON-safe).
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* @param {import('./sequencer.js').ShapeSeqEngine} engine
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* @returns {Object}
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*/
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export function serializeShapeSeqState(engine) {
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const chain = engine.getChain();
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const prims = chain.getPrimitives();
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return {
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version: 1,
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chain: {
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primitives: prims.map(p => ({
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name: p.name,
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})),
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states: chain.getState(),
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generatorCombineMode: chain.generatorCombineMode,
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},
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projection: engine.getProjection(),
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voiceMode: engine.voiceMode,
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clock: {
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bpm: engine.getClock().bpm,
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},
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// Sequence MLP weights (for dual mode restoration)
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sequenceWeights: engine.getSequenceIML()?.getWeights?.() ?? null,
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// Freeze state
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freeze: serializeFreezeState(engine.freezeManager),
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};
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}
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/**
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* Serialize freeze manager state to a JSON-safe object.
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* Returns null when not frozen.
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*
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* @param {import('./freeze.js').FreezeManager} fm
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* @returns {Object|null}
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*/
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function serializeFreezeState(fm) {
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if (!fm.isFrozen) return null;
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return {
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mode: fm.freezeMode,
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frozenParams: fm.getFrozenParams() ? Array.from(fm.getFrozenParams()) : null,
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liveFlags: fm.getLiveFlags() ? Array.from(fm.getLiveFlags()) : null,
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seeds: fm.getFrozenSeeds(),
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states: fm.getFrozenStates(),
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masterSeed: fm.getMasterSeed(),
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// For pattern mode:
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frozenPattern: fm.getFrozenPattern() ?? null,
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};
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}
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/**
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* Restore ShapeSeq engine state from a serialized object.
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* @param {import('./sequencer.js').ShapeSeqEngine} engine
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* @param {Object} state - from serializeShapeSeqState
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*/
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export function restoreShapeSeqState(engine, state) {
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if (!state || state.version !== 1) return;
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const chain = engine.getChain();
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// Rebuild chain from primitive names
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if (state.chain?.primitives) {
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// Clear existing
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const existing = chain.getPrimitives();
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for (let i = existing.length - 1; i >= 0; i--) {
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chain.removePrimitive(i);
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}
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// Add from state
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for (const p of state.chain.primitives) {
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const Ctor = PRIMITIVE_REGISTRY[p.name];
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if (Ctor) chain.addPrimitive(new Ctor());
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}
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// Restore states
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if (state.chain.states) chain.setState(state.chain.states);
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if (state.chain.generatorCombineMode) {
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chain.generatorCombineMode = state.chain.generatorCombineMode;
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}
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}
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// Projection
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if (state.projection) engine.setProjection(state.projection);
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// Voice mode
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if (state.voiceMode) engine.setVoiceMode(state.voiceMode);
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// Clock
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if (state.clock?.bpm) engine.setTempo(state.clock.bpm);
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// Sequence MLP weights
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if (state.sequenceWeights) {
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const iml = engine.getSequenceIML();
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if (iml?.setWeights) iml.setWeights(state.sequenceWeights);
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}
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// Freeze state restoration is complex — skip for now, just ensure unfrozen on load
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// TODO: restore freeze state properly
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}
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