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# csgeom/bsptree.h

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    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_CSGEOM_BSPTREE_H__
    00020 #define __CS_CSGEOM_BSPTREE_H__
    00021
    00022 #include "csextern.h"
    00023
    00024 #include "csgeom/plane3.h"
    00025 #include "csutil/array.h"
    00026 #include "csutil/blockallocator.h"
    00027 #include "csutil/dirtyaccessarray.h"
    00028
    00035 struct iGraphics3D;
    00036
    00037 template<class T>
    00038 class csSet;
    00039 struct csTriangle;
    00040
    00046 class CS_CRYSTALSPACE_EXPORT csBSPTree
    00047 {
    00048 private:
    00049   static csBlockAllocator<csBSPTree> tree_nodes;
    00050   static csDirtyAccessArray<int> b2f_array;
    00051
    00052   csBSPTree* child1;            // If child1 is not 0 then child2 will
    00053   csBSPTree* child2;            // also be not 0.
    00054
    00055   csPlane3 split_plane;
    00056   csArray<int> splitters;
    00057
    00058   size_t FindBestSplitter (csTriangle* triangles, csPlane3* planes,
    00059         int num_triangles, csVector3* vertices,
    00060         const csArray<int>& triidx);
    00061   void Build (csTriangle* triangles, csPlane3* planes,
    00062         int num_triangles, csVector3* vertices,
    00063         const csArray<int>& triidx);
    00064   void Back2Front (const csVector3& pos, csDirtyAccessArray<int>& arr,
    00065         csSet<int>& used_indices);
    00066 public:
    00068   csBSPTree ();
    00070   ~csBSPTree ();
    00071
    00073   void Clear ();
    00074
    00078   void Build (csTriangle* triangles, int num_triangles,
    00079         csVector3* vertices);
    00080
    00086   const csDirtyAccessArray<int>& Back2Front (const csVector3& pos);
    00087 };
    00088
    00091 #endif // __CS_CSGEOM_BSPTREE_H__
    00092