Hey all,

I have an application where there is a timeline that updates some texture positions. In the new-frame callback I also calculate the FPS. This showed a nice ~60FPS with occasional drops to 45FPS. These drops where visible in the movement of the textures, you could notice it was not smooth. So i hacked the glx backend to use a swap interval of 2 instead of one. This caused the FPS to drop to a stable 30 , as expected and wanted.

Now I have moved to clutter 1.6.6, and it seems the new-frame is not in sync with the VBLANK. I see FPS as high as 80 and it doesn't seem to matter if i set CLUTTER_VBLANK to dri, glx or none.

Is new-frame supposed to by in sync with VBLANK or was I just lucky it worked like that?

Any hints on how I can debug this in case it is a bug ?

TIA,

Erwin
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