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annotate libs/vmath/ray_c.c @ 15:2d48f65da357

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 07 Jun 2015 20:40:37 +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 "ray.h"
nuclear@10 20 #include "vector.h"
nuclear@10 21
nuclear@10 22 ray_t ray_transform(ray_t r, mat4_t xform)
nuclear@10 23 {
nuclear@10 24 mat4_t upper;
nuclear@10 25 vec3_t dir;
nuclear@10 26
nuclear@10 27 m4_copy(upper, xform);
nuclear@10 28 upper[0][3] = upper[1][3] = upper[2][3] = upper[3][0] = upper[3][1] = upper[3][2] = 0.0;
nuclear@10 29 upper[3][3] = 1.0;
nuclear@10 30
nuclear@10 31 dir = v3_sub(r.dir, r.origin);
nuclear@10 32 dir = v3_transform(dir, upper);
nuclear@10 33 r.origin = v3_transform(r.origin, xform);
nuclear@10 34 r.dir = v3_add(dir, r.origin);
nuclear@10 35 return r;
nuclear@10 36 }