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

[From: Robin Burchell]

Hi,

Excerpts from Alberto Mardegan's message of Tue Aug 17 18:00:34 +0100 2010:
> Am I doing something wrong? I would expect much better performances, 
> with such a simple test application.

Graphics isn't really my strong area, but a few things to think about:

Is the result any smoother if you disable antialiasing? It's a stab in the dark,
but worth a try.

Another possibility is that the underlying rotation isn't able to be
accelerated, meaning a fallback to software, which I don't imagine being fast.

Also note that pushing rotation updates every 10ms means you're trying to push 100fps
(1000ms in a second, 1000/10 = 100), which is faster than the eye can percieve,
and also faster than hardware can usually manage. 60fps is usually the upper
bound, and anything over that is generally not going to be noticed except as
additional burden on the system.

--
Robin Burchell
http://rburchell.com