Hi Dominc,
The best way to do a single GL test at startup is to attach a custom
osg::GraphicsOperation as a RealizeOperation to the viewer, and this
gets called once the viewer's graphics contexts get realized.
Have a look at the osgcatch, osgshaderterrrain and osgvolume examples
to see examples of the above in action.
Robert.
On Fri, Jan 8, 2010 at 8:50 PM, Dominic Stalder
<dominic.stal...@bluewin.ch> wrote:
> Hi there
>
> I would like to read the OpenGL extensions with isGLExtensionSupported(),
> but for this I need a draw context. I registred a DrawCallback Class, see
> below. I need to call the operator() method only once, but because this
> method is const, I cannot write to the member variable bool first. How can I
> resolve this problem?
>
> class GameViewOSGDrawCallback : public osg::Camera::DrawCallback
> {
> private:
> GameViewOSG *parent;
> bool first;
>
> public:
> GameViewOSGDrawCallback(GameViewOSG* parent=0);
>
> virtual void operator()(const osg::Camera&) const;
> };
>
> Thanks a lot
> Dominic
> _______________________________________________
> osg-users mailing list
> osg-users@lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
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