@animech-public/playcanvas/build/playcanvas.dbg/src/framework/anim/evaluator/anim-snapshot.js

PlayCanvas WebGL game engine

import { AnimCache } from './anim-cache.js';

/**
 * AnimSnapshot stores the state of an animation track at a particular time.
 *
 * @ignore
 */
class AnimSnapshot {
  /**
   * Create a new animation snapshot.
   *
   * @param {import('./anim-track.js').AnimTrack} animTrack - The source track.
   */
  constructor(animTrack) {
    this._name = `${animTrack.name}Snapshot`;
    this._time = -1;

    // per-curve input cache
    this._cache = [];

    // per-curve evaluation results
    this._results = [];

    // pre-allocate input caches
    for (let i = 0; i < animTrack._inputs.length; ++i) {
      this._cache[i] = new AnimCache();
    }

    // pre-allocate storage for evaluation results
    const curves = animTrack._curves;
    const outputs = animTrack._outputs;
    for (let i = 0; i < curves.length; ++i) {
      const curve = curves[i];
      const output = outputs[curve._output];
      const storage = [];
      for (let j = 0; j < output._components; ++j) {
        storage[j] = 0;
      }
      this._results[i] = storage;
    }
  }
}

export { AnimSnapshot };