[directfb-dev] Re: v-retrace sync

[Denis Oliver Kropp <dok@directfb.org>]

Quoting Michel Dänzer:
> On Thu, 2003-11-20 at 13:43, micronuke wrote:
> > 
> > i'm quite new to DirectFB but i'm really excited about it since it's just 
> > what i've been searching for for a long time.. i want to develop using it. 
> > thanks a lot for it! :)
> > one of the features i really like is its ability to sync blitting to the 
> > vertical retrace of the monitor. but unfortunately that doesn't seem to 
> > work very well.. i've written a simple test program that just moves a 
> > horizontal line vertically over the screen, one pixel per frame, synced to 
> > the v-retrace. but the result isn't smooth at all.. the movement staggers 
> > a lot. i think there is no mistake in my (very simple) program, but who 
> > knows.. ;) if you want to take a look at it:
> > http://www.micronuke.net/code/test.c
> > 
> > i'm using an ATI Radeon 32MB DDR.. is it probably a problem with the 
> > radeon-driver that is still in development?
> 
> Possibly, radeonWaitVSync() uses usleep(), which IMHO is the better
> default than a busy loop, but you can easily change that to verify it's
> the problem.

BTW, my Radeon 9000 Pro has brilliant benchmark results ;)

I got ~2000 MPixel/sec for FillRectangle and ~1200 MPixel/sec for Blit.

Both tests were running at 16 bit.

-- 
Best regards,
  Denis Oliver Kropp

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