Could this be done in a opengl shader? That way it could be run on the GPU and improve performance a lot. Shadertoy has [1] a dithering example that runs at 60

Could this be done in a opengl shader? That way it could be run on the GPU and improve performance a lot. Shadertoy has [1] a dithering example that runs at 60fps, might be the same effect you have though [1] https://www.shadertoy.com/view/NdsyD7 https://www.shadertoy.com/view/NdsyD7