Method maybeUpdateSource

src/PackedSplats.ts:700–737

()

  // Check if source texture needs to be created/updated
  private maybeUpdateSource(): THREE.DataArrayTexture {
    if (!this.packedArray) {
      throw new Error("No packed splats");
    }

    if (this.needsUpdate || !this.source) {
      this.needsUpdate = false;

      if (this.source) {
        const { width, height, depth } = this.source.image;
        if (this.maxSplats !== width * height * depth) {
          // The existing source texture isn't the right size, so dispose it
          this.source.dispose();
          this.source = null;
        }
      }
      if (!this.source) {
        // Allocate a new source texture of the right size
        const { width, height, depth } = getTextureSize(this.maxSplats);
        this.source = new THREE.DataArrayTexture(
          this.packedArray as Uint32Array<ArrayBuffer>,
          width,
          height,
          depth,
        );
        this.source.format = THREE.RGBAIntegerFormat;
        this.source.type = THREE.UnsignedIntType;
        this.source.internalFormat = "RGBA32UI";
        this.source.needsUpdate = true;
      } else if (this.packedArray.buffer !== this.source.image.data.buffer) {
        // The source texture is the right size, update the data
        this.source.image.data = new Uint8Array(this.packedArray.buffer);
      }
      // Indicate to Three.js that the source texture needs to be uploaded to the GPU
      this.source.needsUpdate = true;
    }
    return this.source;
  }

  static getEmptyArray = (() => {
    const { width, height, depth, maxSplats } = getTextureSize(1);