/*
 * ***** 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.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef __FASTGRID_H__
#define __FASTGRID_H__

/** \file blender/freestyle/intern/geometry/FastGrid.h
 *  \ingroup freestyle
 *  \brief Class to define a cell grid surrounding the bounding box of the scene
 *  \author Stephane Grabli
 *  \date 30/07/2002
 */

#include <cassert>

#include "Grid.h"

namespace Freestyle {

/*! Class to define a regular grid used for ray casting computations 
 *  We don't use a hashtable here. The grid is explicitly stored for faster computations.
 *  However, this might result in significant increase in memory usage (compared to the regular grid)
 */
class LIB_GEOMETRY_EXPORT FastGrid : public Grid
{
public:
	FastGrid() : Grid()
	{
		_cells = NULL;
		_cells_size = 0;
	}

	virtual ~FastGrid()
	{
		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 */
	Cell *getCell(const Vec3u& p);

	/*! Fills the case p with the cell iCell */
	virtual void fillCell(const Vec3u& p, Cell& cell);

protected:
	Cell **_cells;
	unsigned _cells_size;
};

} /* namespace Freestyle */

#endif // __FASTGRID_H__
