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troxtril

Question before starting FBO

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when I use glCopyTexSubImage2D and render to a fullscreen quad, an example scene's framerate goes down from 150 to 105 fps. does FBO make a big performance difference for RTT or is it gonna be something like 110 fps instead of 105?

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Impossible to say. Depends on the context, and on how well you use it.

Generally speaking, glCopyTexSubImage2D will actively copy data around, while FBOs will not. If memory bandwidth is a bottleneck in your application, then using FBOs may yield very significant speedups. If your bottlenecks are elsewhere, you might not see a difference at all.

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