for the ones who use software renderer, using a small sized FrameBuffer and then scaling it to screen may be a better alternative to under sampling.
i didnt make any comprehensive tests but it seems this way peforms better than under sampling. furthermore one can use any sampling ratio. i remember i read something like sun graphics engineers suggest scaling images on the fly (i dont know why)
btw, assuming all others the same, can we say rendering time is proportional to FrameBuffer's area ?
r a f t