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Old 07-17-09, 09:53 AM   #1
madmax43v3r
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Join Date: Jul 2009
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Default glDrawBuffer with FBO, high CPU usage

Hi,

in my GPGPU application i do a lot color buffer changes while an FBO is bound, which results in a 100% CPU usage.
to be exact im doing about 40000 switches per second.

does someone know why switching color buffers is so expensive on the CPU side?

my CPU is a XEON Conroe @ 3.6GHZ
and the GPU is a GTX260.

I also posted this on the nvidia forums:
http://forums.nvidia.com/index.php?showtopic=102123
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