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

[From: Hämäläinen Kimmo]

On Tue, 2010-08-17 at 19:00 +0200, ext Alberto Mardegan wrote:
> Hi!
>    I'm experiencing a horrible performance of the QGraphics 
> "accelerated" rendering when using the attached test program.
> 
> The program uses QGLWidget as a viewport when any command line parameter 
> is passed, and normal Qt rendering (software only?) otherwise.
> 
> When I run the application in my N900, it seems that the software 
> rendering is much smoother than the GL one.
> 
> Am I doing something wrong? I would expect much better performances, 
> with such a simple test application.
> 
> 
> Any help is much appreciated (I'm trying to port Mappero to Qt :-) ).

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...)

-Kimmo

> 
> Ciao,
>    Alberto
>