[maemo-developers] Horrible performance of GL rendering; why? (Qt, N900)

[From: Alberto Mardegan]

Hämäläinen Kimmo wrote:
>>    I'm experiencing a horrible performance of the QGraphics 
>> "accelerated" rendering when using the attached test program.
[...]
> If you can see hildon-desktop taking more than 7% of CPU, try using a
> fullscreen window so it's not composited.  (You may need to provide a
> Switcher and close button yourself...)

I don't think it's the compositor's fault. I found this yesterday: 
http://bugreports.qt.nokia.com/browse/QTBUG-10420

It seems that Qt 4.6 is not using OpenGL ES operations for drawing textures, so 
this might be the reason.
I'll try with 4.7 from extras devel, and let you know.

Ciao,
   Alberto

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