Re: [GtkGLExt] GdkGLPixmap troubles

[Lindley M French <lfrench1 gmu edu>]

Well, the "right" way to do it is to to EXT_framebuffer_object, which most graphics cards support these days. However, I'm trying to avoid introducing a GLEW or GLee dependency, and I hate dealing with OpenGL extensions manually. It's the principal of the thing.

----- Original Message -----
From: Stephane Popinet <s popinet niwa co nz>
Date: Wednesday, August 26, 2009 5:20 pm
Subject: Re: [GtkGLExt] GdkGLPixmap troubles

> Hi Lindley, Jean,
> 
> > Exporting a GL view is just a nightmare. Things seem to depend 
> upon the
> > used driver. The solutioin I use can be seen at
> > 
> http://svn.savannah.gnu.org/viewvc/trunk/gchemutils/libs/gcu/glview.cc?annotate=1098&root=gchemutils> starting from line 368. Not sure it works in all cases.
> 
> Yes, I can confirm that doing offscreen openGL rendering in a portable
> way truly is a nightmare. It depends on the openGL driver and some
> drivers are so dodgy that they even tell you that they support
> offscreen openGL rendering when they don't.
> 
> OSMesa is a good alternative, however it is not that well 
> supported either...
> 
> I would imagine offscreen openGL rendering to be something many people
> want to do but I am puzzled by the lack of ressources on the topic on
> the web. Are people using some other mechanism we are not aware of?
> 
> Thanks for your code Jean, I will have a look and see if I can use it
> to improve mine (http://gfs.sf.net).
> 
> cheers
> 
> Stephane
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