[osg-users] DrawCallback only once

[Dominic Stalder]

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