code: function getPixelArray() {
    var gl = store.get('gl')
    var w = this._.texture.width;
    var h = this._.texture.height;
    var array = new Uint8Array(w * h * 4);
    this._.texture.drawTo(function() {
      gl.readPixels(0, 0, w, h, gl.RGBA, gl.UNSIGNED_BYTE, array);
    });
    return array;
  }
docs: /*
  Get a Uint8 array of pixel values: [r, g, b, a, r, g, b, a, ...]
  Length of the array will be width * height * 4.