/****************************************************************************

 Copyright (C) 2002-2008 Gilles Debunne. All rights reserved.

 This file is part of the QGLViewer library version 2.3.1.

 http://www.libqglviewer.com - contact@libqglviewer.com

 This file may be used under the terms of the GNU General Public License 
 versions 2.0 or 3.0 as published by the Free Software Foundation and
 appearing in the LICENSE file included in the packaging of this file.
 In addition, as a special exception, Gilles Debunne gives you certain 
 additional rights, described in the file GPL_EXCEPTION in this package.

 libQGLViewer uses dual licensing. Commercial/proprietary software must
 purchase a libQGLViewer Commercial License.

 This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

*****************************************************************************/

// TP OpenGL: Joerg Liebelt, Serigne Sow
// classe derivee de terrain pour implementer un terrain optimise dynamiquement par Quadtrees
#ifndef __QUADTREE_H__
#define __QUADTREE_H__

#include "terrain.h"
#include <qgl.h>

#define QT_LR_NODE 0
#define QT_LL_NODE 1
#define QT_UL_NODE 2
#define QT_UR_NODE 3


//codes decrivant le type de suite de triangles a creer, selon la presence d'enfants recursives
#define QT_COMPLETE_FAN 0
#define QT_LL_UR	5
#define QT_LR_UL	10
#define QT_NO_FAN       15

#define VIEW_RIGHT  0
#define VIEW_LEFT   1
#define VIEW_BOTTOM 2
#define VIEW_TOP    3
#define VIEW_FAR    4
#define VIEW_NEAR   5



struct SQT_VERTEX
{
  float height;
};


class QUADTREE : public TERRAIN
{
private:
  //matrice quadtree
  unsigned char* quadMatrix;

  //matrice decrivant la region vue par la camera
  float viewMatrix[6][4];

  float pX,pY,pZ;	//camera position; parametres de SimpleViewer-Object

  //niveau de detail
  float detailLevel;	//souhaite
  float minResolution;	//minimum

  void PropagateRoughness( void );
  void RefineNode( float x, float z, int edgeLength );
  void RenderNode( float x, float z, int edgeLength, bool multiTextures= true, bool detail= true );
  void RenderVertex( float x, float z, float u, float v, bool multiTextures );

  inline int GetMatrixIndex( int X, int Z )
  {	return ( ( Z*sizeHeightMap )+X );	}

public:

  bool Init( void );
  void Shutdown( void );

  void Update(float x, float y, float z );
  void Render( void );

  void ComputeView( void );
  bool CubeViewTest( float x, float y, float z, float size );

  inline void setCameraPosition(float x, float y, float z)
  {        	pX=x; pY=y; pZ=z;	}

  inline void SetDetailLevel( float detail )
  {	detailLevel= detail;	}


  inline void SetMinResolution( float res )
  {	minResolution= res;	}

  inline unsigned char GetQuadMatrixData( int X, int Z )
  {
    if ((X>sizeHeightMap) || (X<0) || (Z>sizeHeightMap) || (Z<0))
      {
	printf("Matrix limits exceeded: %d,%d\n",X,Z);
	return 255;
      }
    return quadMatrix[ ( Z*sizeHeightMap )+X];
  }

  QUADTREE( void )
  {
    detailLevel=	2.5f;	//50.0f;
    minResolution = 1.2f;	//10.0f;
  }

  ~QUADTREE( void )
  {	}
};

#endif	//__QUADTREE_H__