#ifndef OSG_FRONTFACE
#define OSG_FRONTFACE 1

#include <osg/StateAttribute>
#include <osg/GL>

namespace osg {

/** Class to specifies the orientation of front-facing polygons.
*/     
class SG_EXPORT FrontFace : public StateAttribute
{
    public :
    
        FrontFace();

        META_StateAttribute(FrontFace, FRONTFACE);
        
        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
        virtual int compare(const StateAttribute& sa) const
        {
            // check the types are equal and then create the rhs variable
            // used by the COMPARE_StateAttribute_Paramter macro's below.
            COMPARE_StateAttribute_Types(FrontFace,sa)

            // compare each paramter in turn against the rhs.
            COMPARE_StateAttribute_Parameter(_mode)

            return 0; // passed all the above comparison macro's, must be equal.
        }

        enum Mode {
            CLOCKWISE = GL_CW,
            COUNTER_CLOCKWISE = GL_CCW
        };
    
        inline void setMode(const Mode mode) { _mode = mode; }
        inline const Mode getMode() const    { return _mode; }
    
        virtual void apply(State& state) const;
        
    protected:
    
        virtual ~FrontFace();
        
        Mode _mode;

};

};

#endif