kernel.js

this.gpuRender = this.gpu
      .createKernel(
        function(scene, sceneLength, bufferWidth) {
          var channel = this.thread.x % 4;
          if (channel === 3) {
            return 255;
          }
          var x = this.thread.x % bufferWidth;
          var y = this.thread.x / bufferWidth;

          for (let i1 = 0; i1 < sceneLength; i1 += 7) {
            var id1 = scene[i1 + 1];
            var x1 = scene[i1 + 2];
            var y1 = scene[i1 + 3];
            var w1 = scene[i1 + 4];
            var h1 = scene[i1 + 5];
            var r1 = scene[i1 + 6];
            var offsetX1 = x1 - x;

            if (offsetX1 > 0 && offsetX1 < w1) {

              var offsetY1 = y1 - y;
              if (offsetY1 > 0 && offsetY1 < h1) {
                if (
                  this.constants[id1][offsetX1][offsetY1][3] !== 0 &&
                  z1 > z

                ) {
                  return this.constants[id1][offsetX1][offsetY1][channel];
                }
              }

            }
          }
          return 0;
        },
        {
          constants: storageObj
        }
      )
      .setOutput([this.smallWidth * this.smallHeight * 4])
      .setOutputToTexture(true);