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annotate libs/vmath/ray_c.c @ 43:73813c1176de

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better hgignore
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 14 Aug 2015 04:33:42 +0300
parents c0ae8e668447
children
rev   line source
nuclear@39 1 /*
nuclear@39 2 libvmath - a vector math library
nuclear@39 3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@39 4
nuclear@39 5 This program is free software: you can redistribute it and/or modify
nuclear@39 6 it under the terms of the GNU Lesser General Public License as published
nuclear@39 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@39 8 (at your option) any later version.
nuclear@39 9
nuclear@39 10 This program is distributed in the hope that it will be useful,
nuclear@39 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@39 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@39 13 GNU Lesser General Public License for more details.
nuclear@39 14
nuclear@39 15 You should have received a copy of the GNU Lesser General Public License
nuclear@39 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@39 17 */
nuclear@39 18
nuclear@28 19 #include "ray.h"
nuclear@28 20 #include "vector.h"
nuclear@28 21
nuclear@28 22 ray_t ray_transform(ray_t r, mat4_t xform)
nuclear@28 23 {
nuclear@28 24 mat4_t upper;
nuclear@28 25 vec3_t dir;
nuclear@28 26
nuclear@28 27 m4_copy(upper, xform);
nuclear@28 28 upper[0][3] = upper[1][3] = upper[2][3] = upper[3][0] = upper[3][1] = upper[3][2] = 0.0;
nuclear@28 29 upper[3][3] = 1.0;
nuclear@28 30
nuclear@28 31 dir = v3_sub(r.dir, r.origin);
nuclear@28 32 dir = v3_transform(dir, upper);
nuclear@28 33 r.origin = v3_transform(r.origin, xform);
nuclear@28 34 r.dir = v3_add(dir, r.origin);
nuclear@28 35 return r;
nuclear@28 36 }