1 files changed, 109 insertions, 0 deletions
diff --git a/source/blender/freestyle/intern/geometry/HashGrid.h b/source/blender/freestyle/intern/geometry/HashGrid.h
new file mode 100755
index 00000000000..f6605957676
--- /dev/null
+++ b/source/blender/freestyle/intern/geometry/HashGrid.h
@@ -0,0 +1,109 @@
+//
+//  Filename         : HashGrid.h
+//  Author(s)        : Stephane Grabli
+//  Purpose          : Class to define a cell grid surrounding the
+//                     bounding box of the scene
+//  Date of creation : 30/07/2002
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef  HASHGRID_H
+# define HASHGRID_H
+
+//# if defined(__GNUC__) && (__GNUC__ >= 3)
+// hash_map is not part of the C++ standard anymore;
+// hash_map.h has been kept though for backward compatibility
+//#  include <hash_map.h>
+//# else
+//#  include <hash_map>
+//# endif
+
+# include "Grid.h"
+# include <map>
+/*! Defines a hash table used for searching the Cells */
+struct GridHasher{
+#define _MUL 950706376UL
+#define _MOD 2147483647UL
+  inline size_t operator() (const Vec3u& p) const 
+  {
+    size_t res = ((unsigned long) (p[0] * _MUL)) % _MOD;
+    res = ((res + (unsigned long) (p[1]) * _MUL)) % _MOD;
+    return ((res +(unsigned long) (p[2]) * _MUL)) % _MOD;
+  }
+};
+
+/*! Class to define a regular grid used for ray
+  casting computations */
+
+class LIB_GEOMETRY_EXPORT HashGrid : public Grid
+{
+ public:
+
+  typedef map<Vec3u, Cell*> GridHashTable;
+  
+  HashGrid() : Grid() {}
+
+  virtual ~HashGrid() {
+    clear();
+  }
+
+  /*! clears the grid
+   *  Deletes all the cells, clears the hashtable,
+   *  resets size, size of cell, number of cells.
+   */
+  virtual void clear();
+
+  /*! Sets the different parameters of the grid
+   *    orig
+   *      The grid origin
+   *    size
+   *      The grid's dimensions
+   *    nb
+   *      The number of cells of the grid
+   */
+  virtual void configure(const Vec3r& orig, const Vec3r& size, unsigned nb);
+  
+  /*! returns the cell whose coordinates
+   *  are pased as argument
+   */
+  virtual Cell* getCell(const Vec3u& p) {
+    Cell* found_cell = NULL;
+    
+    GridHashTable::const_iterator found = _cells.find(p);
+    if (found != _cells.end())
+      found_cell = (*found).second;
+    return found_cell;
+  }
+  
+  /*! Fills the case p with the cell iCell */
+  virtual void fillCell(const Vec3u& p, Cell& cell) {
+    _cells[p] = &cell;
+  }
+
+protected:
+
+  GridHashTable _cells;
+};
+
+#endif // HASHGRID_H