You would need to texture sample the intermediate mip levels separately. All GPUs (that I know of) expect the mips to be power-2 reductions. You are also incre

You would need to texture sample the intermediate mip levels separately. All GPUs (that I know of) expect the mips to be power-2 reductions. You are also increasing texture memory usage (storage and bandwidth) by 50%. There is probably some quality improvement, but there is a fairly large cost. Would be interesting to see what the results look like.