annotate libs/vmath/ray_c.c @ 1:c3f5c32cb210
barfed all the libraries in the source tree to make porting easier
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John Tsiombikas <nuclear@member.fsf.org> |
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Sun, 01 Nov 2015 00:36:56 +0200 |
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1 /*
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2 libvmath - a vector math library
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3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU Lesser General Public License as published
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7 by the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 #include "ray.h"
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20 #include "vector.h"
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21
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22 ray_t ray_transform(ray_t r, mat4_t xform)
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23 {
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24 mat4_t upper;
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25 vec3_t dir;
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26
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27 m4_copy(upper, xform);
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28 upper[0][3] = upper[1][3] = upper[2][3] = upper[3][0] = upper[3][1] = upper[3][2] = 0.0;
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29 upper[3][3] = 1.0;
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30
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31 dir = v3_sub(r.dir, r.origin);
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32 dir = v3_transform(dir, upper);
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33 r.origin = v3_transform(r.origin, xform);
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34 r.dir = v3_add(dir, r.origin);
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35 return r;
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36 }
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