#ifndef OSG_POLYGONOFFSET
#define OSG_POLYGONOFFSET 1

#include <osg/StateAttribute>
#include <osg/StateSet>

namespace osg {

/** PolygonOffset - encapsulates the OpenGL glPolygonOffset state.*/
class SG_EXPORT PolygonOffset : public StateAttribute
{
    public :

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

        virtual const Type getType() const { return POLYGONOFFSET; }

        virtual void setStateSetModes(StateSet& ds,const GLModeValue value) const
        {
            ds.setMode(GL_POLYGON_OFFSET_FILL,value);
            ds.setMode(GL_POLYGON_OFFSET_LINE,value);
            ds.setMode(GL_POLYGON_OFFSET_POINT,value);
        }

        inline void setFactor(const float factor) { _factor = factor; }
        inline const float getFactor() const { return _factor; }
        
        inline void setUnits(const float units) { _units = units; }
        inline const float getUnits() const { return _units; }

        virtual void apply(State& state) const;

    protected :

        virtual ~PolygonOffset();

        float       _factor;
        float       _units;

};

};

#endif