/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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 OSGTERRAINSYSTEM
#define OSGTERRAINSYSTEM 1

#include <osg/Group>
#include <osg/CoordinateSystemNode>

#include <osgTerrain/TerrainTile>

namespace osgTerrain {

/** TerrainSystem provides a framework for loosely coupling height field data with height rendering algorithms.
  * This allows TerrainTechnique's to be plugged in at runtime.*/
class OSGTERRAIN_EXPORT TerrainSystem : public osg::Group
{
    public:

        TerrainSystem();
        
        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        TerrainSystem(const TerrainSystem&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);

        META_Node(osgTerrain, TerrainSystem);

        virtual void traverse(osg::NodeVisitor& nv);
        

        /** Set the TerrainTechnique that is used as the prototype for all Terrain below the TerrainSystem. */
        void setTerrainTechnique(osgTerrain::TerrainTechnique* TerrainTechnique);

        /** Get the TerrainTechnique*/
        TerrainTechnique* getTerrainTechnique() { return _terrainTechnique.get(); }
        
        /** Get the const TerrainTechnique*/
        const TerrainTechnique* getTerrainTechnique() const { return _terrainTechnique.get(); }

    protected:

        virtual ~TerrainSystem();

        osg::ref_ptr<TerrainTechnique>      _terrainTechnique;
        

       
};

}

#endif