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List:       kwin
Subject:    Why custom flushBuffer code?
From:       Martin =?utf-8?q?Gr=C3=A4=C3=9Flin?= <kde () martin-graesslin ! com>
Date:       2010-12-01 19:14:47
Message-ID: 201012012015.01092.kde () martin-graesslin ! com
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Hi,

can anyone explain me why we need the code in 
void SceneOpenGL::flushBuffer( int mask, QRegion damage )
for double buffering?

I just tried to implement it with ES and none of the used API calls is 
present. There is neither an equivialent to glxCopySubBuffer nor the 
glBitmap/glCopyPixel combo.

So my ES code is currently running without anything in paintBackground and 
without anything in flushBuffer except eglSwapBuffer. And it's working fine. I 
cannot notice any problems.

So if there is no reason for that code, I would dare to remove the flushBuffer 
and paintBackground code. This should improve the rendering quite a lot as 
it's many glScissor followed by single quad painting.

Cheers
Martin

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