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