/* -*-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 OSGTERRAIN_GEOMETRYTECHNIQUE
#define OSGTERRAIN_GEOMETRYTECHNIQUE 1

#include <osg/MatrixTransform>
#include <osg/Geode>
#include <osg/Geometry>

#include <osgTerrain/TerrainTechnique>

namespace osgTerrain {

class OSGTERRAIN_EXPORT TerrainGeometry : public osg::Drawable
{
    public:
        TerrainGeometry();

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

        virtual osg::Object* cloneType() const { return new TerrainGeometry(); }
        virtual osg::Object* clone(const osg::CopyOp& copyop) const { return new TerrainGeometry(*this,copyop); }        
        virtual bool isSameKindAs(const osg::Object* obj) const { return dynamic_cast<const TerrainGeometry*>(obj)!=NULL; }
        virtual const char* libraryName() const { return "osgTerrain"; }
        virtual const char* className() const { return "TerrainGeometry"; }
    
        void setVertices(osg::Vec3Array* vertices) { _vertices.first = vertices; }
        osg::Vec3Array* getVertices() { return _vertices.first.get(); }
        const osg::Vec3Array* getVertices() const { return _vertices.first.get(); }

        void setNormals(osg::Vec3Array* normals) { _normals.first = normals; }
        osg::Vec3Array* getNormals() { return _normals.first.get(); }
        const osg::Vec3Array* getNormals() const { return _normals.first.get(); }

        void setColors(osg::Vec4Array* colors) { _colors.first = colors; }
        osg::Vec4Array* getColors() { return _colors.first.get(); }
        const osg::Vec4Array* getColors() const { return _colors.first.get(); }

        void setTexCoords(unsigned int unit, osg::Array* array) { _texcoords.resize(unit+1); _texcoords[unit].first = array; }
        osg::Array* getTexCoords(unsigned int unit) { return _texcoords[unit].first.get(); }
        const osg::Array* getTexCoords(unsigned int unit) const { return _texcoords[unit].first.get(); }

        void addPrimitiveSet(osg::PrimitiveSet* primitiveSet) { _primitiveSets.push_back(primitiveSet); }
        
        osg::PrimitiveSet* getPrimtitiveSet(unsigned int i) { return _primitiveSets[i].get(); }
        const osg::PrimitiveSet* getPrimtitiveSet(unsigned int i) const { return _primitiveSets[i].get(); }
        unsigned int getNumPrimitiveSets() const { return _primitiveSets.size(); }


        virtual osg::BoundingBox computeBound() const;

        /** Draw Geometry directly ignoring an OpenGL display list which could be attached.
          * This is the internal draw method which does the drawing itself,
          * and is the method to override when deriving from Geometry for user-drawn objects.
        */
        virtual void drawImplementation(osg::RenderInfo& renderInfo) const;

    protected:
    
        typedef osg::Geometry::PrimitiveSetList PrimitiveSetList;

        typedef std::pair< osg::ref_ptr<osg::Array>, GLvoid*>       ArrayData;
        typedef std::pair< osg::ref_ptr<osg::FloatArray>, GLvoid*>  FloatArrayData;
        typedef std::pair< osg::ref_ptr<osg::Vec2Array>, GLvoid*>   Vec2ArrayData;
        typedef std::pair< osg::ref_ptr<osg::Vec3Array>, GLvoid*>   Vec3ArrayData;
        typedef std::pair< osg::ref_ptr<osg::Vec4Array>, GLvoid*>   Vec4ArrayData;
        
        typedef std::vector< ArrayData >                            TexCoordsList;

        Vec3ArrayData       _vertices;
        Vec3ArrayData       _normals;
        Vec4ArrayData       _colors;
        TexCoordsList       _texcoords;
        
        PrimitiveSetList    _primitiveSets;

};

class OSGTERRAIN_EXPORT GeometryTechnique : public TerrainTechnique
{
    public:

        GeometryTechnique();

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

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

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

        virtual void cleanSceneGraph();

        virtual void dirty();
        
        
        
        void setFilterBias(float filterBias);
        float getFilterBias() const { return _filterBias; }
        
        void setFilterWidth(float filterWidth);
        float getFilterWidth() const { return _filterWidth; }

        void setFilterMatrix(const osg::Matrix3& matrix);
        osg::Matrix3& getFilterMatrix() { return _filterMatrix; }
        const osg::Matrix3& getFilterMatrix() const { return _filterMatrix; }
        
        enum FilterType
        {
            GAUSSIAN,
            SMOOTH,
            SHARPEN
        };
        
        void setFilterMatrixAs(FilterType filterType);


    protected:

        virtual ~GeometryTechnique();

        osg::ref_ptr<osg::MatrixTransform>  _transform;
        osg::ref_ptr<osg::Geode>            _geode;
        
        osg::ref_ptr<TerrainGeometry>       _terrainGeometry;
        osg::ref_ptr<osg::Geometry>         _geometry;
        
        float                               _filterBias;
        osg::ref_ptr<osg::Uniform>          _filterBiasUniform;
        float                               _filterWidth;
        osg::ref_ptr<osg::Uniform>          _filterWidthUniform;
        osg::Matrix3                        _filterMatrix;
        osg::ref_ptr<osg::Uniform>          _filterMatrixUniform;
};

}

#endif