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csgeom/bsptree.h

00001 /*
00002     Copyright (C) 2004 by Jorrit Tyberghein
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public
00015     License along with this library; if not, write to the Free
00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00019 #ifndef __CS_BSPTREE_H__
00020 #define __CS_BSPTREE_H__
00021 
00022 #include "csextern.h"
00023 #include "csutil/array.h"
00024 #include "csutil/garray.h"
00025 #include "csutil/hash.h"
00026 #include "csutil/blockallocator.h"
00027 
00028 struct iGraphics3D;
00029 class csBSPTree;
00030 
00036 class CS_CSGEOM_EXPORT csBSPTree
00037 {
00038 private:
00039   static csBlockAllocator<csBSPTree> tree_nodes;
00040   static csDirtyAccessArray<int> b2f_array;
00041 
00042   csBSPTree* child1;            // If child1 is not 0 then child2 will
00043   csBSPTree* child2;            // also be not 0.
00044 
00045   csPlane3 split_plane;
00046   csArray<int> splitters;
00047 
00048   int FindBestSplitter (csTriangle* triangles, csPlane3* planes,
00049         int num_triangles, csVector3* vertices,
00050         const csArray<int>& triidx);
00051   void Build (csTriangle* triangles, csPlane3* planes,
00052         int num_triangles, csVector3* vertices,
00053         const csArray<int>& triidx);
00054   void Back2Front (const csVector3& pos, csDirtyAccessArray<int>& arr,
00055         csSet<int>& used_indices);
00056 public:
00058   csBSPTree ();
00060   ~csBSPTree ();
00061 
00063   void Clear ();
00064 
00068   void Build (csTriangle* triangles, int num_triangles,
00069         csVector3* vertices);
00070 
00076   const csDirtyAccessArray<int>& Back2Front (const csVector3& pos);
00077 };
00078 
00079 #endif // __CS_BSPTREE_H__
00080 

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