What I do when drawing full screen effects, is normally to sample a full screen quad, but at the native resolution. After a while I realized that it was becoming quite slow, with multiple full screen effects.
How do other people accomplish a steady performance when doing these full screen effects, multiple of them?
Could you decrease the resolution when performing these effects, so as an example, scaling down the screen when applying the bloom effect, or when blurring something?
Thanks, as usual.