vrshoot
annotate libs/vmath/ray_c.c @ 0:b2f14e535253
initial commit
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sat, 01 Feb 2014 19:58:19 +0200 |
| parents | |
| children |
| rev | line source |
|---|---|
| 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 } |