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Diffstat (limited to 'source/blender/freestyle/intern/geometry/HashGrid.h')
-rw-r--r-- | source/blender/freestyle/intern/geometry/HashGrid.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/source/blender/freestyle/intern/geometry/HashGrid.h b/source/blender/freestyle/intern/geometry/HashGrid.h new file mode 100644 index 00000000000..ca6edb258a9 --- /dev/null +++ b/source/blender/freestyle/intern/geometry/HashGrid.h @@ -0,0 +1,116 @@ +/* + * ***** BEGIN GPL LICENSE BLOCK ***** + * + * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + * The Original Code is Copyright (C) 2010 Blender Foundation. + * All rights reserved. + * + * The Original Code is: all of this file. + * + * Contributor(s): none yet. + * + * ***** END GPL LICENSE BLOCK ***** + */ + +#ifndef __HASHGRID_H__ +#define __HASHGRID_H__ + +/** \file blender/freestyle/intern/geometry/HashGrid.h + * \ingroup freestyle + * \brief Class to define a cell grid surrounding the bounding box of the scene + * \author Stephane Grabli + * \date 30/07/2002 + */ + +#if 0 +# 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 +#endif + +#include <map> + +#include "Grid.h" + +/*! 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; + } +#undef _MUL +#undef _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__ |