/vr/ - Retro Games

In many cases (eg. NES, SNES) you can't have pixel perfect output, because the original device had non-square pixels (yes anonymous who always shits on pixel aspect discussions, they are called non-square pixels when they're intended to be displayed as non-squares).

In that case the best option is to scale to an integer ratio using nearest neighbor, and then scale down to final size with bicubic or similar. Or use Retroarch's pixelate shader. Sometimes you can keep one axis at an integer ratio and use pure nearest neighbor for that axis only (see image, note subtle blurring/ringing in x-axis only).