Re: NSOpenGLView

[Enrico Sersale]

On 2006-11-08 15:26:35 +0200 Renaud Molla <renaud.molla@wanadoo.fr> wrote:

> Enrico:
> What do you mean by [[self openGLContext] flushBuffer] does the trick?

I mean that an implementation of -drawRect: like this:

- (void)drawRect:(NSRect)rect
{
  glClearColor(0, 0, 0, 0);
  glClear(GL_COLOR_BUFFER_BIT);
  glColor3f(1.0f, 0.85f, 0.35f);
  glBegin(GL_TRIANGLES);
  glVertex3f(0.0,  0.6, 0.0);
  glVertex3f(-0.2, -0.3, 0.0);
  glVertex3f(0.2, -0.3 ,0.0);
  glEnd();
  glFlush();

  /* add this line */
  [[self openGLContext] flushBuffer];
}

will work without the need of a timer.

> Will it solve the problem if i remove these calls?
> Or do you mean that these make the drawRect: called repeatedly?
> And what does the timer if it is created and scheduled, set to  repeat, is 
> never invalidated in the code and calls pulseColor which  in turn calls 
> setNeedsDisplay: that will then call drawRect:
> ?
>
> If anybody still thinks about something, let me know
>
> Renaud
>
> On Nov 8, 2006, at 12:27 PM, Enrico Sersale wrote:
>
> > On 2006-11-08 12:41:52 +0200 Renaud Molla <renaud.molla@wanadoo.fr>  wrote:
> >
> > > Hi,
> > > 	I'm trying to write an NSOpenGLView application (actually i'm  using  an 
> > > example from Stefan Urbanek
> > >         http://lists.gnu.org/archive/html/discuss-gnustep/2004-11/ msg00191.html
> > >         and corrected the things so it launches and run),
> > > 	but the NSOpenGLView doesn't display anything although the  drawRect 
> > > method is called regularly
> > >         through the use of a timer.
> >
> > It seems that, in the Stefan's example, is the "[[self  openGLContext] 
> > flushBuffer]" at the end of -drawRect: that does the  trick, not the timer.
> >
> > > 	The view 'contains' what was in the background before the window 
> > > appeared.
> > >         Moving the window don't make it display anything either.
> > > 	Making the NSOpenGLView the window contentView does not change   anything 
> > > equally.
> > >         The same code works 100% when compiled with cocoa.
> > >         Any help would be appreciated !-)
> > > Renaud Molla
> >
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