/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 * OpenSceneGraph Public License for more details.
*/

#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.*/
        bool addClipPlane(ClipPlane* clipplane);

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

        /** return the number of ClipPlanes.*/
        inline 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&,StateAttribute::GLModeValue) const;

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

    protected:

        virtual ~ClipNode();

        virtual bool computeBound() const;

        StateAttribute::GLModeValue _value;
        ClipPlaneList _planes;
};

}

#endif
