#ifndef OSG_POLYGONOFFSET
#define OSG_POLYGONOFFSET 1

#include <osg/Export>
#include <osg/Object>
#include <osg/Vec3>

namespace osg {

class Input;
class Output;

class SG_EXPORT PolygonOffset : public Object
{
    public :

        PolygonOffset();
        static PolygonOffset* instance();
        virtual Object* clone() const { return new PolygonOffset(); }
        virtual bool isSameKindAs(Object* obj) { return dynamic_cast<PolygonOffset*>(obj)!=NULL; }
        virtual const char* className() const { return "PolygonOffset"; }

        void setOffset(float factor,float units);

        static void enable( void );
        static void disable( void );

        void apply( void );

    protected :

        virtual ~PolygonOffset();

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

        float       _factor;
        float       _units;

};

};

#endif