[HOpenGL] Re: HOpenGL on macs?

[Carlos Scheidegger]

Heh. interestingly enough, I didn't remember needing the glFlush()
call in Windows platforms (where I had used glut before), but now I
think I recall reading something about that. With flush :: IO() it
works. Sorry to bother you all with stupid things.

Maybe the HOpenGL tutorial should include flush in the calls, then. I
forgot that GLUT defaults to single-buffered.. My bad.

Thanks all,
-carlos

On Fri, 25 Jun 2004 08:55:27 +0200, Sven Panne <sven.panne at aedion.de> wrote:
> 
> Carlos Scheidegger wrote:
> > [...] What happens is that the window seems to be created ok (at least I get
> > a window entitled "APolygon"), but the contents of the window are just
> > plain white. It should be to a red background, and a white polygon
> > should be drawn.. [...]
> 
> I guess this is not Mac-specific at all: You don't use initialDisplayMode,
> so a single buffered window will be created by default. But you are using
> swapBuffers in your display callback, which is for double buffered windows.
> I'm not sure what exactly happens on Mac OS X then, but it is not correct
> on any platform. Two easy fixes: You can either request a double buffered
> window via "initializeDisplayMode [ ..., DoubleBuffered, ... ]" (before
> you create the window, of course), or you can use flush instead of swapBuffers.
> 
> Cheers,
>     S.
> 
>