#ifndef OSG_CLIPPLANE
#define OSG_CLIPPLANE 1

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

namespace osg {

/** ClipPlane state class which encapsulates OpenGL glClipPlane() functionality.*/
class SG_EXPORT ClipPlane : public StateAttribute
{
    public :

        ClipPlane();
        
        /** return a shallow copy of a node, with Object* return type.*/
        virtual Object* clone() const { return new ClipPlane(); }

        /** return true if this and obj are of the same kind of object.*/
        virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const ClipPlane*>(obj)!=NULL; }

        /** return the name of the node's class type.*/
        virtual const char* className() const { return "ClipPlane"; }

        virtual const Type getType() const { return (Type)(CLIPPLANE+_clipPlaneNum); }
        
        virtual void setStateSetModes(StateSet& ds,const GLModeValue value) const
        {
            ds.setMode((GLMode)(GL_CLIP_PLANE0+_clipPlaneNum),value);
        }


	/** Set the clip plane, using a Vec4 to define plane. */
        void setClipPlane(const Vec4& plane);

	/** Set the clip plane, using a Plane to define plane. */
        void setClipPlane(const Plane& plane);

	/** Set the clip plane, using a double[4] to define plane. */
        void setClipPlane(const double* plane);

	/** Get the clip plane, values entered into a Vec4 passed to the getClipPlane. */
        void getClipPlane(Vec4& plane) const;

	/** Get the clip plane, values entered into a Plane passed to the getClipPlane. */
        void getClipPlane(Plane& plane) const;

	/** Get the clip plane, values entered into a double[4] passed to the getClipPlane. */
        void getClipPlane(double* plane) const;

	/** Set the clip plane number. */
        void setClipPlaneNum(const unsigned int num);

	/** Get the clip plane number. */
        const unsigned int getClipPlaneNum() const;

	/** Apply the clip plane's state to the OpenGL state machine. */
        virtual void apply(State& state) const;

    protected :
    
        virtual ~ClipPlane();
        
        double*             _clipPlane;
        unsigned int        _clipPlaneNum;

};

};

#endif