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

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

--- Comment #6 from Pierre Ossman pierre-bugzilla@ossman.eu --- (In reply to comment #5)

(In reply to comment #4)

...

I'm also seeing something else waiting for vsync. With glReadPixels() out of the picture, and glXSwapIntervalMESA(0), I'm still getting 60 fps and no tearing. Possibly related?

Either

Option "SwapbuffersWait" "off"

and/or

Option "EnablePageFlip" "off"

should avoid that.

I see. In the interest of being honest to applications, shouldn't glXGetSwapIntervalMESA() return 1 when those settings are on?