Method constructor

tfjs-backend-webgl/src/pack_gpu.ts:31–66

(
      outputShape:
          number[])

  rank: number;

  constructor(
      outputShape:
          number[]) {  // TODO(https://github.com/tensorflow/tfjs/issues/893):
                       // Only input / output 3D tensors.
    this.outputShape = outputShape;
    this.rank = outputShape.length;
    this.enableShapeUniforms = useShapeUniforms(this.outputShape.length);

    if (this.rank === 0) {
      this.userCode = `
        void main() {
          setOutput(vec4(getA(), 0., 0., 0.));
        }
      `;
    } else {
      const channels = getChannels('rc', this.rank);
      const dtype = getCoordsDataType(this.rank);
      const outOfBoundsCondition = this.getOutOfBoundsCondition(channels);
      const setup = this.getSetup(channels);
      const output = this.getOutput(channels);

      this.userCode = `
        void main() {
          ${dtype} rc = getOutputCoords();

          if(${outOfBoundsCondition}) {
            setOutput(vec4(0));
          } else {
            ${setup}

            setOutput(vec4(${output}));
          }
        }
      `;
    }
  }

  private getSourceCoordsArr(dims: string[]): string[] {
    const coords = [];