/*
 * ***** 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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Laurence Bourn, Campbell Barton
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef __BLI_QUADRIC_H__
#define __BLI_QUADRIC_H__

/** \file BLI_quadric.h
 *  \ingroup bli
 */

typedef struct Quadric {
	double a2, ab, ac, ad,
	           b2, bc, bd,
	               c2, cd,
	                   d2;
} Quadric;

/* conversion */
void  BLI_quadric_from_plane(Quadric *q, const double v[4]);
void  BLI_quadric_to_tensor_m3(const Quadric *q, float m[3][3]);
void  BLI_quadric_to_vector_v3(const Quadric *q, float v[3]);

void  BLI_quadric_clear(Quadric *q);

/* math */
void  BLI_quadric_add_qu_qu(Quadric *a, const Quadric *b);
void  BLI_quadric_add_qu_ququ(Quadric *r, const Quadric *a, const Quadric *b);
void  BLI_quadric_mul(Quadric *a, const double scalar);

/* solve */
double BLI_quadric_evaluate(const Quadric *q, const float v_fl[3]);
bool  BLI_quadric_optimize(const Quadric *q, float v[3], const float epsilon);

#endif /* __BLI_QUADRIC_H__ */