[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 #10 from Pierre Ossman <pierre-bugzilla at ossman.eu> ---
Ok, some kind of progress. The call that is causing the delay now is
glUseProgram(0);. It grows gradually from no latency up to 17 ms (i.e. one
frame @ 60 Hz). Then it goes back down again and the cycle repeats.

Ideas?

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