function newShader(currentPixel, index, pixels, imgWidth, imgHeight) { newPixel[CHANNEL.RED] = currentPixel[CHANNEL.RED];
newPixel[CHANNEL.GREEN] = currentPixel[CHANNEL.GREEN];
newPixel[CHANNEL.BLUE] = currentPixel[CHANNEL.BLUE];
newPixel[CHANNEL.ALPHA] = currentPixel[CHANNEL.ALPHA];
} currentShader = newShader;