[SDL] Incremental updates and hardware/double buffered surfaces

[David Olofson]

On Wednesday 24 August 2005 06.30, Sam Lantinga wrote:
> > Problem is, when I switch to fullscreen mode, the screen flickers
> > because the next update is a dirty update.  The only way I've been
> > able to fix it is basically force a full update each frame,
> > eliminating the incremental/dirty update code.  But in this case,
> > now performance drops again.  Is there a way of combining
> > incremental updates with hardware/double-buffered surfaces in such
> > as way that I don't have to redraw the whole frame every frame?      
> 
> It's pretty simple, you just have to maintain two dirty lists, one
> for each back buffer.  There are some pretty good descriptions on
> the mailing list if you use the search option at www.libsdl.org

My Pig example/game includes this feature, along with a small "engine" 
that combines dirty rectangles for efficiency - though it's not 
exactly a simple, minimal example. ;-)

	http://olofson.net/examples.html


//David Olofson - Programmer, Composer, Open Source Advocate

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