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Diffstat (limited to 'source/blender/freestyle/intern/geometry/matrix_util.h')
| -rw-r--r-- | source/blender/freestyle/intern/geometry/matrix_util.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/source/blender/freestyle/intern/geometry/matrix_util.h b/source/blender/freestyle/intern/geometry/matrix_util.h new file mode 100644 index 00000000000..1cf58a8e1fd --- /dev/null +++ b/source/blender/freestyle/intern/geometry/matrix_util.h @@ -0,0 +1,72 @@ +/* + * ***** 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. + * + * This Code is Copyright (C) 2010 Blender Foundation. + * All rights reserved. + * + * The Original Code is: + * GXML/Graphite: Geometry and Graphics Programming Library + Utilities + * Copyright (C) 2000 Bruno Levy + * Contact: Bruno Levy + * levy@loria.fr + * ISA Project + * LORIA, INRIA Lorraine, + * Campus Scientifique, BP 239 + * 54506 VANDOEUVRE LES NANCY CEDEX + * FRANCE + * + * Contributor(s): none yet. + * + * ***** END GPL LICENSE BLOCK ***** + */ + +#ifndef __MATRIX_UTIL__ +#define __MATRIX_UTIL__ + +/** \file blender/freestyle/intern/geometry/matrix_util.h + * \ingroup freestyle + * \author Bruno Levy + */ + +#include "../system/FreestyleConfig.h" + +namespace OGF { + +namespace MatrixUtil { + + /** + * computes the eigen values and eigen vectors of a semi definite symmetric matrix + * + * @param matrix is stored in column symmetric storage, i.e. + * matrix = { m11, m12, m22, m13, m23, m33, m14, m24, m34, m44 ... } + * size = n(n+1)/2 + * + * @param eigen_vectors (return) = { v1, v2, v3, ..., vn } + * where vk = vk0, vk1, ..., vkn + * size = n^2, must be allocated by caller + * + * @param eigen_values (return) are in decreasing order + * size = n, must be allocated by caller + */ + LIB_GEOMETRY_EXPORT + void semi_definite_symmetric_eigen(const double *mat, int n, double *eigen_vec, double *eigen_val); + +} // MatrixUtil namespace + +} // OGF namespace + +#endif // __MATRIX_UTIL__ |