vrshoot

annotate libs/vmath/ray_c.c @ 3:c179c72369be

rename candy->vr
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 03 Feb 2014 08:52:13 +0200
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nuclear@0 1 /*
nuclear@0 2 libvmath - a vector math library
nuclear@0 3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@0 4
nuclear@0 5 This program is free software: you can redistribute it and/or modify
nuclear@0 6 it under the terms of the GNU Lesser General Public License as published
nuclear@0 7 by the Free Software Foundation, either version 3 of the License, or
nuclear@0 8 (at your option) any later version.
nuclear@0 9
nuclear@0 10 This program is distributed in the hope that it will be useful,
nuclear@0 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
nuclear@0 13 GNU Lesser General Public License for more details.
nuclear@0 14
nuclear@0 15 You should have received a copy of the GNU Lesser General Public License
nuclear@0 16 along with this program. If not, see <http://www.gnu.org/licenses/>.
nuclear@0 17 */
nuclear@0 18
nuclear@0 19 #include "ray.h"
nuclear@0 20 #include "vector.h"
nuclear@0 21
nuclear@0 22 ray_t ray_transform(ray_t r, mat4_t xform)
nuclear@0 23 {
nuclear@0 24 mat4_t upper;
nuclear@0 25 vec3_t dir;
nuclear@0 26
nuclear@0 27 m4_copy(upper, xform);
nuclear@0 28 upper[0][3] = upper[1][3] = upper[2][3] = upper[3][0] = upper[3][1] = upper[3][2] = 0.0;
nuclear@0 29 upper[3][3] = 1.0;
nuclear@0 30
nuclear@0 31 dir = v3_sub(r.dir, r.origin);
nuclear@0 32 dir = v3_transform(dir, upper);
nuclear@0 33 r.origin = v3_transform(r.origin, xform);
nuclear@0 34 r.dir = v3_add(dir, r.origin);
nuclear@0 35 return r;
nuclear@0 36 }