sf::RenderWindow vs sfml/qt

[cfrankb]

Situation:

I'm using OpenSuse 11.3 with the opensource "radeon" driver for my ATI X1200 (RS690). Performance is worse than it was under 11.2. Funny thing is that qt/SFML app gives me better framerate (within tolerance) than the solo SFML window (way too slow).

Questions

What is the difference in implementation between a sf::RenderWindow and SFML/qt view? Is the former using overlay? If that is the case, it is possible to disable the use of overlay as the "radeon" driver doesn't seem to support them?

Regards,
Frank B.

[Laurent]

SFML doesn't use overlays at all. I have no idea why the native window is slower than the Qt one. Which source code do you use to test the native window?

[cfrankb]

I've reduced the code to simpliest expression.
http://www.sassociations.net/cfrankb/lgck/files/main.cpp

Windows performance
very acceptable and steady

time: 0.003021
time: 0.002736
time: 0.002969
time: 0.002785
time: 0.003455
time: 0.002951
time: 0.003027
time: 0.002904
time: 0.002792
time: 0.002776
time: 0.003016
time: 0.003111
time: 0.002905
time: 0.003325
time: 0.002804
time: 0.002825

Linux performance
linux timing is very erratic.

time: 0.033695
time: 0.008993
time: 0.009385
time: 0.029248
time: 0.009420
time: 0.033759
time: 0.028335
time: 0.008597
time: 0.009402
time: 0.019659
time: 0.009232
time: 0.026068
time: 0.026345
time: 0.008113
time: 0.009443
time: 0.015783
time: 0.020896
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[Antidote]

It could be the OGL backend for SFML or your drivers ;P