[Bug 79223] extra vsync when reading back pixels in xbmc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79223

--- Comment #13 from Michel Dänzer <michel at daenzer.net> ---
(In reply to comment #9)
> No effect I'm afraid. Since this is a full screen application I assume it
> was already using flipping and not blitting anyway?

Probably. For the sake of testing, have you tried disabling page flipping in
addition to SwapBuffersWait?


(In reply to comment #12)
> Down to dri2_drawable_get_buffers() now. I assume I'll be hitting a point
> where I'll have to switch over to looking in the X server soon...

Yep, it's waiting for DRI2 buffer information from the X server, which is
delayed until the previous buffer swap actually finishes.


FWIW, you might get somewhat less confusing timings if you call glFinish()
before glXSwapBuffers().

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