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annotate libs/vmath/ray_c.c @ 34:8471225a460c

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author John Tsiombikas <nuclear@member.fsf.org>
date Sat, 05 Oct 2013 03:08:22 +0300
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nuclear@27 1 /*
nuclear@27 2 libvmath - a vector math library
nuclear@27 3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@27 4
nuclear@27 5 This program is free software: you can redistribute it and/or modify
nuclear@27 6 it under the terms of the GNU Lesser General Public License as published
nuclear@27 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@27 8 (at your option) any later version.
nuclear@27 9
nuclear@27 10 This program is distributed in the hope that it will be useful,
nuclear@27 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@27 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@27 13 GNU Lesser General Public License for more details.
nuclear@27 14
nuclear@27 15 You should have received a copy of the GNU Lesser General Public License
nuclear@27 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@27 17 */
nuclear@27 18
nuclear@27 19 #include "ray.h"
nuclear@27 20 #include "vector.h"
nuclear@27 21
nuclear@27 22 ray_t ray_transform(ray_t r, mat4_t xform)
nuclear@27 23 {
nuclear@27 24 mat4_t upper;
nuclear@27 25 vec3_t dir;
nuclear@27 26
nuclear@27 27 m4_copy(upper, xform);
nuclear@27 28 upper[0][3] = upper[1][3] = upper[2][3] = upper[3][0] = upper[3][1] = upper[3][2] = 0.0;
nuclear@27 29 upper[3][3] = 1.0;
nuclear@27 30
nuclear@27 31 dir = v3_sub(r.dir, r.origin);
nuclear@27 32 dir = v3_transform(dir, upper);
nuclear@27 33 r.origin = v3_transform(r.origin, xform);
nuclear@27 34 r.dir = v3_add(dir, r.origin);
nuclear@27 35 return r;
nuclear@27 36 }