I'm working on an effect that uses a really low resolution to speed up things.
But when I draw the final image, which is drawn from, say... at the lowest size, an RT of 320x200, onto a 1280x720 RT, some pixels are intermitent due to the size reduced and not always being interpolated correctly.
How to deal with that ? If I use a 4x smaller size, do I need to do many textures fetches around the current pixel to keep the max of them ? 16 texture sampling to sample the square around the current pixel +1 for the pixel ?
Is it better to sample in square ? Diamond ?