#ifndef OSG_CULLFACE
#define OSG_CULLFACE 1

#include <osg/Export>
#include <osg/Object>
#include <osg/GL>

namespace osg {

/** Class to globally enable/disable OpenGL's polygon culling mode
    (GL_CULL_FACE).
*/     
class SG_EXPORT CullFace : public Object
{
    public :
    
        enum Mode {
            FRONT = GL_FRONT,
            BACK = GL_BACK,
            FRONT_AND_BACK = GL_FRONT_AND_BACK
        };
    
        CullFace();
        static CullFace* instance();
        virtual bool isSameKindAs(Object* obj) { return dynamic_cast<CullFace*>(obj)!=NULL; }
        virtual Object* clone() const { return new CullFace(); }
        virtual const char* className() const { return "CullFace"; }
    
        void setMode(Mode mode) { _mode = mode; }
    
	/** Enable the polygon culling mode.*/
        static void enable();
	/** Disable the polygon culling mode.*/
        static void disable();

        void apply();
        
    protected:
    
        virtual ~CullFace();

        virtual bool readLocalData(Input& fr);
        virtual bool writeLocalData(Output& fw);
        
        Mode _mode;

};

};

#endif