@openhps/core/dist/esm/three/renderers/common/RenderLists.js

Open Hybrid Positioning System - Core component

import ChainMap from './ChainMap.js';
import RenderList from './RenderList.js';
const _chainKeys = [];

/**
 * This renderer module manages the render lists which are unique
 * per scene and camera combination.
 *
 * @private
 */
class RenderLists {
  /**
   * Constructs a render lists management component.
   *
   * @param {Lighting} lighting - The lighting management component.
   */
  constructor(lighting) {
    /**
     * The lighting management component.
     *
     * @type {Lighting}
     */
    this.lighting = lighting;

    /**
     * The internal chain map which holds the render lists.
     *
     * @type {ChainMap}
     */
    this.lists = new ChainMap();
  }

  /**
   * Returns a render list for the given scene and camera.
   *
   * @param {Scene} scene - The scene.
   * @param {Camera} camera - The camera.
   * @return {RenderList} The render list.
   */
  get(scene, camera) {
    const lists = this.lists;
    _chainKeys[0] = scene;
    _chainKeys[1] = camera;
    let list = lists.get(_chainKeys);
    if (list === undefined) {
      list = new RenderList(this.lighting, scene, camera);
      lists.set(_chainKeys, list);
    }
    _chainKeys.length = 0;
    return list;
  }

  /**
   * Frees all internal resources.
   */
  dispose() {
    this.lists = new ChainMap();
  }
}
export default RenderLists;