Re: How I can do Double Buffer whether OpenGl Ext?

[Carlos Pereira <jose carlos pereira ist utl pt>]

And then you will have a expose callback similar to this:

int my_expose (GtkWidget *widget, GdkEventExpose *event, void *data)
{
GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable (widget);
GdkGLContext *glcontext = gtk_widget_get_gl_context (widget);
app_window *my_window = APP_CAST_WINDOW data;

/*
* draw only last expose
*/

if (event->count > 0) return TRUE;

if (gdk_gl_drawable_gl_begin (gldrawable, glcontext) == TRUE)
 {
 draw_my_window (my_window);

 if (gdk_gl_drawable_is_double_buffered (gldrawable) == TRUE)
   gdk_gl_drawable_swap_buffers (gldrawable);
 else
   glFlush ();

 glGetError ();

 gdk_gl_drawable_gl_end (gldrawable);
 }

return TRUE;
}

Regards,
Carlos
> >From the logo example:
>
>     
>     /*
>      * Configure OpenGL-capable visual.
>      */
>     
>     /* Try double-buffered visual */
>     glconfig = gdk_gl_config_new_by_mode (GDK_GL_MODE_RGB    |
>                                           GDK_GL_MODE_DEPTH  |
>                                           GDK_GL_MODE_DOUBLE);
>     if (glconfig == NULL)
>     {
>         g_print ("*** Cannot find the double-buffered visual.\n");
>         g_print ("*** Trying single-buffered visual.\n");
>         
>         /* Try single-buffered visual */
>         glconfig = gdk_gl_config_new_by_mode (GDK_GL_MODE_RGB   |
>                                               GDK_GL_MODE_DEPTH);
>         if (glconfig == NULL)
>         {
>             g_print ("*** No appropriate OpenGL-capable visual found.\n");
>             exit (1);
>         }
>     }
>     
> ......
>
>     /* Set OpenGL-capability to the widget. */
>     gtk_widget_set_gl_capability (drawing_area,
>                                   glconfig,
>                                   NULL,
>                                   TRUE,
>                                   GDK_GL_RGBA_TYPE);
>     
>
>
> This function first tries to create a glconfig using double buffered, if fails, uses single buffer). This works on OS X 10.6 Snow Leopard. 
>
>
>
>
>  EMAILING FOR THE GREATER GOOD
> Join me
>
>   
> > Date: Tue, 9 Feb 2010 04:41:12 -0300
> > Subject: How I can do Double Buffer whether OpenGl Ext?
> > From: grojas icc gmail com
> > To: gtk-app-devel-list gnome org
> >
> > Hi,
> >
> > I'm trying to do a double buffer with pixbuf and draw area, whether to use
> > OpenGL Ext, but i don't know if it is posible or not.
> >
> > Any idea?
> >
> > Thanks.
> >
> > Gustavo R.
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
> >     
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