title: How to achieve downsampling AA/filtering in OpenGL
body: <p>I'm working on a game that uses pixelart and a camera that will not match the size of the pixel art one to one. To keep the pixels looking like pixels, I want to render the entire game at a higher resolution then downsample it to the actual window resolution (similar to what the GeDoSaTo mod does in Dark Souls 2) and simply use nearest filtering on the in-game textures as mag filter. How can I do this downsampling in code?</p>