OpenGL pixel doubling on an NSOpenGLView

Question

I have a 480x320 NSOpenGLView that I'd like to scale up to 960x640, but in a way that pixels appear as twice the size (and sharp).

If I call

[myglview setFrame:CGRectMake(0,0,960,640)];

the view scales up to the desired size, but the pixels rendered by OpenGL calls are still at the native resolution.

How can I scale up the GL view, pixels' size included?

Answer 1

You render into a 480x320 FBO, and use this FBO as a texture on a screen-aligned quad with NEAREST filtering in a second pass.