I would like to run some game on windowed mode, but its hard to see the game when my desktop resolution is huge. One solution could be to change my desktop resolution every time i play the game. But the bad thing is that my screen automatically smoothes the pixels when im using non-native resolutions, and the blurred pixels really makes it ugly and hard to look at.

Is there some program to double the pixel size of any opengl/directx window without smoothing the pixels?

I've tried multiple magnifying glass programs, but they all seem to make it blurred...