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Old 10-27-09, 06:44 AM   #1
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Join Date: Feb 2007
Posts: 25
Default VSYNC Frame Counter

Who mantains the VSYNC Frame Counter? Is it determined in the driver alone or is it maintained on the video card?

I'm trying to use glXWaitVideoSyncSGI(..,..,&count). I'm running at 60Hz, but when I look at "count" at 100ms since the last time I checked it, it simply is one more than last time.

During this 100ms, I'm either retrieving a texture from the GPU (and pulling to the CPU) or storing a texture on the GPU (from the CPU).

I would have expected the GPU to still increment this frame count (multiple times) even if I'm keeping the driver busy with something.

I have a G-SYNC card and tried glXQueryFrameCountNV() but it seems to be returning garbage for the frame count.

Am I missing something?

I'm using a Quadro FX 5600 with 185.18.14. I see 185.18.31 fixes some other glXWaitVideoSyncSGI problem. I'll get a sys-admin to install this driver but will it fix this problem?
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