@animech-public/playcanvas/build/playcanvas.dbg/src/scene/batching/batch.js

PlayCanvas WebGL game engine

import { BoundingBox } from '../../core/shape/bounding-box.js';

/**
 * Holds information about batched mesh instances. Created in {@link BatchManager#create}.
 *
 * @category Graphics
 */
class Batch {
  /**
   * Create a new Batch instance.
   *
   * @param {import('../mesh-instance.js').MeshInstance[]} meshInstances - The mesh instances to
   * be batched.
   * @param {boolean} dynamic - Whether this batch is dynamic (supports transforming mesh
   * instances at runtime).
   * @param {number} batchGroupId - Link this batch to a specific batch group. This is done
   * automatically with default batches.
   */
  constructor(meshInstances, dynamic, batchGroupId) {
    /** @private */
    this._aabb = new BoundingBox();
    /**
     * An array of original mesh instances, from which this batch was generated.
     *
     * @type {import('../mesh-instance.js').MeshInstance[]}
     */
    this.origMeshInstances = void 0;
    /**
     * A single combined mesh instance, the result of batching.
     *
     * @type {import('../mesh-instance.js').MeshInstance}
     */
    this.meshInstance = null;
    /**
     * Whether this batch is dynamic (supports transforming mesh instances at runtime).
     *
     * @type {boolean}
     */
    this.dynamic = void 0;
    /**
     * Link this batch to a specific batch group. This is done automatically with default batches.
     *
     * @type {number}
     */
    this.batchGroupId = void 0;
    this.origMeshInstances = meshInstances;
    this.dynamic = dynamic;
    this.batchGroupId = batchGroupId;
  }

  // Removes the batch meshes from all layers and destroys it
  destroy(scene, layers) {
    if (this.meshInstance) {
      this.removeFromLayers(scene, layers);
      this.meshInstance.destroy();
      this.meshInstance = null;
    }
  }
  addToLayers(scene, layers) {
    for (let i = 0; i < layers.length; i++) {
      const layer = scene.layers.getLayerById(layers[i]);
      if (layer) {
        layer.addMeshInstances([this.meshInstance]);
      }
    }
  }
  removeFromLayers(scene, layers) {
    for (let i = 0; i < layers.length; i++) {
      const layer = scene.layers.getLayerById(layers[i]);
      if (layer) {
        layer.removeMeshInstances([this.meshInstance]);
      }
    }
  }

  // Updates bounding box for a batch
  updateBoundingBox() {
    this._aabb.copy(this.origMeshInstances[0].aabb);
    for (let i = 1; i < this.origMeshInstances.length; i++) {
      this._aabb.add(this.origMeshInstances[i].aabb);
    }
    this.meshInstance.aabb = this._aabb;
    this.meshInstance._aabbVer = 0;
  }
}

export { Batch };