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Diffstat (limited to 'source/blender/freestyle/intern/geometry/HashGrid.h')
-rwxr-xr-x | source/blender/freestyle/intern/geometry/HashGrid.h | 109 |
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 |