test2.js

         const gpuTexturize = graphics.gpu
            .createKernel(function(buffer, width) {
              var channel = buffer[((this.thread.y * width * 4) // calculate the index on the flat array buffer for the y index
                  + this.thread.x * 4) // add the x which is the current row
                  + this.thread.z] // add z which is the current channel
              return channel;
            })
            .setOutput([image.width, image.height, 4]);

// would expect this to output [[[255, 255, 255, 255], [255, 255, 255, 255], [255, 255, 255, 255], [255, 255, 255, 255], ... and so on for each width pixel ... ], [...], [...], [...], [...], [...], [...] ... and so on for each height pixel ... ]
// (it doesnt work this way, the output here would actually be [[], [], [], []] structured by the z axis which is the color channel