How do I wait for vertical retrace?

[Samuel Thibault]

Carsten Haitzler, le Wed 07 May 2008 00:50:46 +0800, a écrit :
> On Tue, 6 May 2008 18:43:52 +0200 Nicolas George
> <nicolas.george at normalesup.org> babbled:
> > L'octidi 18 floréal, an CCXVI, Johan Walles a écrit :
> > > I don't care about vertical retrace in itself, waiting for vertical
> > > retrace would only be a way for me to achieve flicker-free animation
> > > in a 2D application.
> > 
> > DOUBLE-BUFFER is no good for that: when used for continuous animation (such
> > as video), it causes exactly as much tearing as a simple bitmap copy. At
> > least it was true in November 2006.
> 
> it's been pretty much true as long as i have done anything with x (since about
> 1995...). i have yet to see is not tear...

He may be fine with tears, which are not like flickers.

Samuel