GlutDrawer.h

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#ifndef NAN_INCLUDED_GlutDrawer
#define NAN_INCLUDED_GlutDrawer

#include "MEM_NonCopyable.h"
#include "MEM_SmartPtr.h"

// So pissed off with Glut callback stuff
// that is impossible to call objects unless they are global

// inherit from GlutDrawer and installl the drawer in the singleton
// class GlutDrawManager.

class GlutDrawer {
public :

        virtual 
                void
        Draw(
        )= 0;

        virtual 
        ~GlutDrawer(
        ){};            
};

class GlutDrawManager : public MEM_NonCopyable{

public :

        static
                GlutDrawManager *
        Instance(
        );

        // this is the function you should pass to glut

        static
                void
        Draw(
        );

                void
        InstallDrawer(
                GlutDrawer *
        );

                void
        ReleaseDrawer(
        );

        ~GlutDrawManager(
        );

private :

        GlutDrawManager (
        ) :
                m_drawer (0)
        {
        };
        
        GlutDrawer * m_drawer;

        static MEM_SmartPtr<GlutDrawManager> m_s_instance;
};      

#endif