etindexhandler.h

etm2.2是基于Ogre引擎开发的地形库

#ifndef __ETINDEXHANDLER_H__
#define __ETINDEXHANDLER_H__

/*
EDITABLE TERRAIN MANAGER for Ogre
Copyright (C) 2007  Holger Frydrych <[e-mail]>

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

As a special exception, you may use this file as part of a free software
library without restriction.  Specifically, if other files instantiate
templates or use macros or inline functions from this file, or you compile
this file and link it with other files to produce an executable, this
file does not by itself cause the resulting executable to be covered by
the GNU General Public License.  This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/

#include <OgreVertexIndexData.h>

#include <vector>
#include <map>

namespace ET
{
  namespace Impl
  {

    /** Manages the vertex LOD index buffers shared among the tiles */
    class IndexHandler
    {
    public:
      IndexHandler(size_t tileSize, unsigned int maxLOD);
      ~IndexHandler();

      Ogre::IndexData* requestIndexData(unsigned int lod, unsigned int neighbourState);

    private:
      Ogre::IndexData* createIndexes(unsigned int lod, unsigned int neighbourState);
      int stitchEdge(int direction, unsigned int hiLOD, unsigned int loLOD, bool omitFirstTri,
        bool omitLastTri, unsigned short** ppIdx);
      unsigned short index(size_t x, size_t z) const;

      enum
      {
        NORTH = 0,
        EAST = 1,
        SOUTH = 2,
        WEST = 3
      };


      typedef std::map<unsigned int, Ogre::IndexData*> IndexMap;
      typedef std::vector<IndexMap> LODArray;
      LODArray mIndexes;
      size_t mTileSize;
    };

  }
}

#endif