goat3d
view libs/vmath/basis_c.c @ 46:9d911100935b
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| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 08 Dec 2013 03:00:25 +0200 |
| parents | |
| children |
line source
1 /*
2 libvmath - a vector math library
3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published
7 by the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
19 #include "basis.h"
20 #include "matrix.h"
22 void basis_matrix(mat4_t res, vec3_t i, vec3_t j, vec3_t k)
23 {
24 m4_identity(res);
25 m4_set_column(res, v4_cons(i.x, i.y, i.z, 1.0), 0);
26 m4_set_column(res, v4_cons(j.x, j.y, j.z, 1.0), 1);
27 m4_set_column(res, v4_cons(k.x, k.y, k.z, 1.0), 2);
28 }
30 void basis_matrix_dir(mat4_t res, vec3_t dir)
31 {
32 vec3_t k = v3_normalize(dir);
33 vec3_t j = {0, 1, 0};
34 vec3_t i = v3_cross(j, k);
35 j = v3_cross(k, i);
36 basis_matrix(res, i, j, k);
37 }