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xfang11790
04-09-2003, 05:28 PM
Hi, does anybody encounter the same problem as mine? I am trying to render a float volume in a float pbuffer and I found the frequent CTT (glCopyTexSubImage) killed me, which will take near half a second every time creating a 512 size texture. My program is run on Geforce 5800 Ultra, driver version 43.45

thanks...

gking
04-10-2003, 12:23 AM
If performance is important (or desirable), do not use CopyToTexture with floating-point textures/pbuffers. Use render-to-texture instead.

nutball
04-10-2003, 02:06 AM
I see similarly poor performance on Linux (under the 43.49 drivers). Unfortunately, AFAIK I have no fall-back to render-to-texture (which is Windows only at the moment). http://www.opengl.org/discussion_boards/ubb/frown.gif