//C++ header - Open Scene Graph - Copyright (C) 1998-2001 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_CLIPNODE
#define OSG_CLIPNODE 1

#include <osg/Group>
#include <osg/ClipPlane>

namespace osg {

/** Leaf Node for defining the position of ClipPlanes in the scene.*/
class SG_EXPORT ClipNode : public Group
{

    public:

        typedef std::vector<ref_ptr<ClipPlane> > ClipPlaneList;


        ClipNode();

        ClipNode(const ClipNode& es, const CopyOp& copyop=CopyOp::SHALLOW_COPY);

        META_Node(osg, ClipNode);
	
	/** Create a 6 clip planes to create a clip box.*/
	void createClipBox(const BoundingBox& bb,unsigned int clipPlaneNumberBase=0);


        /** Add a ClipPlane to a ClipNode. Return true if plane is added, 
          * return false if plane already exists in ClipNode, or clipplane is false.*/
        const bool addClipPlane(ClipPlane* clipplane);

        /** Remove ClipPlane from a ClipNode. Return true if plane is removed, 
          * return false if plane does not exists in ClipNode.*/
        const bool removeClipPlane(ClipPlane* clipplane);

        /** Remove ClipPlane, at specified index, from a ClipNode. Return true if plane is removed, 
          * return false if plane does not exists in ClipNode.*/
        const bool removeClipPlane(unsigned int pos);

        /** return the number of ClipPlanes.*/
        inline const unsigned  int getNumClipPlanes() const { return _planes.size(); }


        /** Get ClipPlane at specificed index position.*/
        inline ClipPlane* getClipPlane(unsigned int pos) { return _planes[pos].get(); }

        /** Get const ClipPlane at specificed index position.*/
        inline const ClipPlane* getClipPlane(unsigned int pos) const { return _planes[pos].get(); }

        /** Get the ClipPlaneList.*/
        inline ClipPlaneList& getClipPlaneList() { return _planes; }

        /** Get the const ClipPlaneList.*/
        inline const ClipPlaneList& getClipPlaneList() const { return _planes; }

        /** Set the GLModes on StateSet associated with the ClipPlanes.*/
        void setStateSetModes(StateSet&,const StateAttribute::GLModeValue) const;

        /** Set up the local StateSet */
        void setLocalStateSetModes(const StateAttribute::GLModeValue=StateAttribute::ON);

    protected:

        virtual ~ClipNode();

        virtual const bool computeBound() const;

        StateAttribute::GLModeValue _value;
        ClipPlaneList _planes;
};

}

#endif