Question before starting FBO
Author
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?
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.
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.
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
