/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2005 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 OSGTERRAIN_HEIGHTFIELDHeightFieldRenderer
#define OSGTERRAIN_HEIGHTFIELDHeightFieldRenderer 1

#include <osg/Object>

#include <osgUtil/UpdateVisitor>
#include <osgUtil/CullVisitor>

#include <osgTerrain/Export>

namespace osgTerrain {

class HeightFieldNode;

class OSGTERRAIN_EXPORT HeightFieldRenderer : public osg::Object
{
    public:

        HeightFieldRenderer();

        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        HeightFieldRenderer(const HeightFieldRenderer&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
        
        HeightFieldNode* getHeightFieldNode() { return _heightFieldNode; }
        const HeightFieldNode* getHeightFieldNode() const { return _heightFieldNode; }

        virtual void initialize() = 0;

        virtual void heightFieldHasBeenModified() = 0;

        virtual void update(osgUtil::UpdateVisitor* nv) = 0;

        virtual void cull(osgUtil::CullVisitor* nv) = 0;

    protected:

        virtual ~HeightFieldRenderer();
        
        friend class osgTerrain::HeightFieldNode;

        HeightFieldNode* _heightFieldNode;

};

}

#endif
