gpu.js: Error compiling fragment shader

What is wrong?

• After I play the video (which I process and put into another canvas) I get the Error Compiling Fragment Shader error.

Uncaught (in promise) Error: Error compiling fragment shader: ERROR: 0:471: 'assign' : l-value required
ERROR: 0:474: 'assign' : l-value required
�
    at WebGL2Kernel.build (gpu-browser.min.js:14)
    at WebGL2Kernel.t (gpu-browser.min.js:14)
    at n (gpu-browser.min.js:14)
    at Object.predictModel (processor.js:174)

Where does it happen?

When I try to run the following kernel:

      const gpu = new GPU();
      const kernel_normalize = gpu.createKernel(function (y_buffer,u_buffer,v_buffer,pixels) {
        for(let i=0; i<pixels; i++){
          if(y_buffer[this.thread.x] < 0 ) y_buffer[this.thread.x]=0;
          if(y_buffer[this.thread.x] > 1 ) y_buffer[this.thread.x]=1;
          this.color(y_buffer[this.thread.x],u_buffer[this.thread.x],v_buffer[this.thread.x]);
        }
      })
      .setOutput([this.orig_cols * this.scale_factor , this.orig_rows * this.scale_factor])
      .setGraphical(true);

      const canvas_gpu = kernel_normalize.canvas;
      document.getElementsByTagName('body')[0].appendChild(canvas_gpu);

How do we replicate the issue?

Running the above function on video tag data obtained using the getImageData.

How important is this (1-5)?

5

Expected behavior (i.e. solution)

It should show the same video data on a canvas, but is giving me a black canvas (repeatedly appending to the body tag).

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