[Mesa-dev] [Bug 54763] glCopyPixels dirties the context and all rendering is slower after that

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54763

--- Comment #6 from Michel Dänzer <michel at daenzer.net> 2012-09-12 09:29:28 UTC ---
(In reply to comment #3)
> Yes, the read buffer is GL_FRONT in this case. So I guess the slow-down is by
> design in Mesa.

Rather the X server / DRI2 protocol. It *might* be possible to make xserver not
enforce the fake front buffer for the Composite Overlay Window, not sure.


> I'm going to work around it in compiz anyway. glCopyPixels
> should never be touched at all really.

Out of curiosity, what are you using it for?

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