MipMapPatchIndexs.h

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#if !defined(__INCLUDE_MipMapPatchIndexsh_INCLUDE__)
#define __INCLUDE_MipMapPatchIndexsh_INCLUDE__

#include <geomipmap/MipMapPatchIndex.h>
#include <common/DefinesAssert.h>
#include <common/DefinesMath.h>
#include <vector>

class GLVertexBufferObject;
class MipMapPatchIndexs
{
protected:

        class IndexLevel // One per LOD
        {
        public:
                IndexLevel();
                ~IndexLevel();

                std::vector<MipMapPatchIndex *> borderIndexs_;
        };

public:
        MipMapPatchIndexs();
        ~MipMapPatchIndexs();

        MipMapPatchIndex *getIndex(int lod, int leftLod, int rightLod, int topLod, int bottomLod, int addLod = 0)
        {
                lod = MIN(lod + addLod, getNoLevels() - 1);
                leftLod = MIN(leftLod + addLod, getNoLevels() - 1);
                rightLod = MIN(rightLod + addLod, getNoLevels() - 1);
                topLod = MIN(topLod + addLod, getNoLevels() - 1);
                bottomLod = MIN(bottomLod + addLod, getNoLevels() - 1);

                unsigned int borders = 0;
                if (leftLod != -1 && leftLod > lod) 
                {
                        borders |= (leftLod - lod);
                }
                if (rightLod != -1 && rightLod > lod)
                {
                        borders |= (rightLod - lod) << 3;
                }
                if (topLod != -1 && topLod > lod) 
                {
                        borders |= (topLod - lod) << 9;
                }
                if (bottomLod != -1 && bottomLod > lod) 
                {
                        borders |= (bottomLod - lod) << 6;
                }

                return getIndex(lod, borders);
        }

        MipMapPatchIndex *getIndex(int lod, int border) 
        { 
                if (lod<0) lod=0;
                else if (lod >= getNoLevels()) lod = getNoLevels()-1;

                DIALOG_ASSERT(border < 4096);

                IndexLevel *level = levels_[lod];
                MipMapPatchIndex *index = level->borderIndexs_[border];
                if (!index->getIndices()) return 0;

                return index;
        }
        int getNoLevels() { return (int) levels_.size(); }

        void generate(int size, int totalsize, unsigned int totallods = 99);

        GLVertexBufferObject *getBufferObject() { return bufferObject_; }

protected:
        std::vector<IndexLevel *> levels_;
        GLVertexBufferObject *bufferObject_;
};

#endif // __INCLUDE_MipMapPatchIndexsh_INCLUDE__

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