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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - extra vsync when reading back pixels in xbmc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79223#c13">Comment # 13</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - extra vsync when reading back pixels in xbmc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79223">bug 79223</a>
from <span class="vcard"><a class="email" href="mailto:michel@daenzer.net" title="Michel Dänzer <michel@daenzer.net>"> <span class="fn">Michel Dänzer</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=79223#c9">comment #9</a>)
<span class="quote">> No effect I'm afraid. Since this is a full screen application I assume it
> was already using flipping and not blitting anyway?</span >
Probably. For the sake of testing, have you tried disabling page flipping in
addition to SwapBuffersWait?
(In reply to <a href="show_bug.cgi?id=79223#c12">comment #12</a>)
<span class="quote">> 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...</span >
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().</pre>
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