glheightfield.h

/***************************************************************************
                          glheightfield.h  -  description
                             -------------------
    begin                : Wed Nov 19 2003
    copyright            : (C) 2003 by Jacques Gasselin de Richebourg
    email                : jacquesgasselin@hotmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Lesser General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   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 GNU     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the Free Software   *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA *
 *                                                                         *
 ***************************************************************************/


#ifndef GLHEIGHTFIELD_H
#define GLHEIGHTFIELD_H

#include "glscene.h"
#include "glgeometricobject.h"
#include "glsurface.h"
#include "glimage.h"
#include "smltgl.h"

namespace GLScene
{

   class GLHeightField: public GLGeometricObject, public GLSurfaceGenerator, public GLFieldHolder
   {
      float* heightMap; //range from -1.00f to 1.00f
      bool generated;
      GLSurface surface;
      GLsizei imageWidth, imageHeight;

   public:
      static std::string refvalName;
      static std::string imageName;
      static std::string widthName;
      static std::string lengthName;
      static std::string heightName;

      SML_TAG(heightfield)
      
      GLField<GLuint> referenceValue;
      GLField<GLImage> image;
      GLField<GLfloat> width;
      GLField<GLfloat> length;
      GLField<GLfloat> height;

      GLHeightField();
    virtual ~GLHeightField();

      virtual bool intersection( GLGeometricObject* ){ return false; };
      virtual bool inclusion( GLGeometricObject* ){ return false; };

      virtual FieldBasePtr getFieldByIndex( short index );

      void getVertecies(const GLfloat u, const GLuint nOfV, GLfloat* const verts3) const;
      void getNormals(const GLfloat u, const GLuint nOfN, GLfloat* const normals3) const;

      virtual void render();

      private:
      
      void generate();

      float getHeightAt(const float& u, const float& v) const;
   
   };

};//eo namespace
#endif

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