View Full Version : ATI pbuffer slowdown

05-25-2004, 10:11 AM
Hi all;
Im doing a glow fx using pbuffers, and in NVIDIA hw no problems, but in ATI the fps goes down from 60 to 0.05 ...im doing this way:

before loading any texture:
1. Create a pbuffer_blur 256x256
2. Create a pbuffer_glow 256x256
3. Initialize the VBOs and other texures
4. Render everything to pbuffer_glow, with tex env set to rgb*alpha
5. Bind pbuffer_glow (as texture_2d) and render it with radial blur to pbuffer_blur
6. Render the scene
7. Draw a quad over the whole screen with pbuffer_blur

Im clearing only the depth_buffer_bit of the pbuffer_glow (im rendering a black retangle on the viewport to clear it), and the slowdown is on the step 7...using Visual Studio and debugging, pressing ctrl-f10 (to go to next instruction) last about 3 seconds just for the glEnd() command of the quad rendering...is something wrong with the order oc pbuffer creation, or size of them?

05-26-2004, 12:24 AM
Hi !

I think the advanced forum would be better place for this subject....