/* -*-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 OSGTERRAIN_HEIGHTFIELDNODE
#define OSGTERRAIN_HEIGHTFIELDNODE 1

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

#include <osgTerrain/HeightFieldRenderer>

namespace osgTerrain {

/** Terrain provides a framework for loosly coupling height field data with height rendering algorithms.
  * This allows renderer's to be pluged in at runtime.*/
class OSGTERRAIN_EXPORT HeightFieldNode : public osg::Group
{
    public:

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

        META_Node(osgTerrain, HeightFieldNode);

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


        /** Set the HeightField for this HeightFieldNode.
          * If a Renderer is attached then this will be notified.*/
        void setHeightField(osg::HeightField* heightField);

        /** Get the HeightField.*/
        osg::HeightField* getHeightField() { return _heightField.get(); }
        
        /** Get the const HeightField.*/
        const osg::HeightField* getHeightField() const { return _heightField.get(); }
        
        /** Tell the Renderer that the height field has been modified, so
          * that any cached data will need updating*/
        void heightFieldHasBeenModified();
        
        /** Set the Renderer*/
        void setRenderer(osgTerrain::HeightFieldRenderer* renderer);

        /** Get the Renderer*/
        HeightFieldRenderer* getRenderer() { return _renderer.get(); }
        
        /** Get the const Renderer*/
        const HeightFieldRenderer* getRenderer() const { return _renderer.get(); }

        
        void setBaseTextureImage(osg::Image* image) { _baseTextureImage = image; }
        osg::Image* getBaseTextureImage() { return _baseTextureImage.get(); }
        const osg::Image* getBaseTextureImage() const { return _baseTextureImage.get(); }

        void setDetailTextureImage(osg::Image* image) { _detailTextureImage = image; }
        osg::Image* getDetailTextureImage() { return _detailTextureImage.get(); }
        const osg::Image* getDetailTextureImage() const { return _detailTextureImage.get(); }

        void setCloudShadowTextureImage(osg::Image* image) { _cloudShadowTextureImage = image; }
        osg::Image* getCloudShadowTextureImage() { return _cloudShadowTextureImage.get(); }
        const osg::Image* getCloudShadowTextureImage() const { return _cloudShadowTextureImage.get(); }

        void setNormalMapImage(osg::Image* image) { _normalMapImage = image ; }
        osg::Image* getNormalMapImage() { return _normalMapImage.get(); }
        const osg::Image* getNormalMapImage() const { return _normalMapImage.get(); }
        
        void computeNormalMap();
        

    protected:

        virtual ~HeightFieldNode();


        osg::ref_ptr<osg::HeightField>      _heightField;
        osg::ref_ptr<HeightFieldRenderer>   _renderer;
        
        osg::ref_ptr<osg::Image>            _baseTextureImage;
        osg::ref_ptr<osg::Image>            _detailTextureImage;
        osg::ref_ptr<osg::Image>            _cloudShadowTextureImage;
        osg::ref_ptr<osg::Image>            _normalMapImage;

};

}

#endif