1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/vmath/ray_c.c	Sun Sep 29 08:20:19 2013 +0300
     1.3 @@ -0,0 +1,36 @@
     1.4 +/*
     1.5 +libvmath - a vector math library
     1.6 +Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
     1.7 +
     1.8 +This program is free software: you can redistribute it and/or modify
     1.9 +it under the terms of the GNU Lesser General Public License as published
    1.10 +by the Free Software Foundation, either version 3 of the License, or
    1.11 +(at your option) any later version.
    1.12 +
    1.13 +This program is distributed in the hope that it will be useful,
    1.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.16 +GNU Lesser General Public License for more details.
    1.17 +
    1.18 +You should have received a copy of the GNU Lesser General Public License
    1.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    1.20 +*/
    1.21 +
    1.22 +#include "ray.h"
    1.23 +#include "vector.h"
    1.24 +
    1.25 +ray_t ray_transform(ray_t r, mat4_t xform)
    1.26 +{
    1.27 +	mat4_t upper;
    1.28 +	vec3_t dir;
    1.29 +
    1.30 +	m4_copy(upper, xform);
    1.31 +	upper[0][3] = upper[1][3] = upper[2][3] = upper[3][0] = upper[3][1] = upper[3][2] = 0.0;
    1.32 +	upper[3][3] = 1.0;
    1.33 +
    1.34 +	dir = v3_sub(r.dir, r.origin);
    1.35 +	dir = v3_transform(dir, upper);
    1.36 +	r.origin = v3_transform(r.origin, xform);
    1.37 +	r.dir = v3_add(dir, r.origin);
    1.38 +	return r;
    1.39 +}