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annotate libs/vmath/basis_c.c @ 11:ad49e1f9b627

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 31 May 2015 06:02:08 +0300
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nuclear@10 1 /*
nuclear@10 2 libvmath - a vector math library
nuclear@10 3 Copyright (C) 2004-2015 John Tsiombikas <nuclear@member.fsf.org>
nuclear@10 4
nuclear@10 5 This program is free software: you can redistribute it and/or modify
nuclear@10 6 it under the terms of the GNU Lesser General Public License as published
nuclear@10 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@10 8 (at your option) any later version.
nuclear@10 9
nuclear@10 10 This program is distributed in the hope that it will be useful,
nuclear@10 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@10 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@10 13 GNU Lesser General Public License for more details.
nuclear@10 14
nuclear@10 15 You should have received a copy of the GNU Lesser General Public License
nuclear@10 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@10 17 */
nuclear@10 18
nuclear@10 19 #include "basis.h"
nuclear@10 20 #include "matrix.h"
nuclear@10 21
nuclear@10 22 void basis_matrix(mat4_t res, vec3_t i, vec3_t j, vec3_t k)
nuclear@10 23 {
nuclear@10 24 m4_identity(res);
nuclear@10 25 m4_set_column(res, v4_cons(i.x, i.y, i.z, 1.0), 0);
nuclear@10 26 m4_set_column(res, v4_cons(j.x, j.y, j.z, 1.0), 1);
nuclear@10 27 m4_set_column(res, v4_cons(k.x, k.y, k.z, 1.0), 2);
nuclear@10 28 }
nuclear@10 29
nuclear@10 30 void basis_matrix_dir(mat4_t res, vec3_t dir)
nuclear@10 31 {
nuclear@10 32 vec3_t k = v3_normalize(dir);
nuclear@10 33 vec3_t j = {0, 1, 0};
nuclear@10 34 vec3_t i = v3_cross(j, k);
nuclear@10 35 j = v3_cross(k, i);
nuclear@10 36 basis_matrix(res, i, j, k);
nuclear@10 37 }