glCopyPixels on Radeon?

[heppe]

Does anyone know what the performance expectations of glCopyPixels to and from pbuffers would be on Radeon?

We are looking for a replacement for wgl_arb_buffer_region/ktx_buffer_region, which ATI chose to reserve as a "maintain the profit margins of FireGL" feature.

[NitroGL]

Which Radeon? It's pretty fast on my 9800 and 9700.

[heppe]

9700 or 9800 is what I had in mind. How is the performance relative to reading stuff back into system memory with glReadPixels?

[noisecrime]

Try this http://www.opengl.org/discussion_boards/ubb/Forum3/HTML/010964.html

and
http://www.chez.com/dedebuffer/

4 different sources to download and test - so you can form your own opinion.

Don't forget to post your results so others can learn from it.

[NitroGL]

Originally posted by heppe:
9700 or 9800 is what I had in mind. How is the performance relative to reading stuff back into system memory with glReadPixels?

ReadPixels is below average, unfortantly.