1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/vmath/ray.inl	Sun Sep 29 08:20:19 2013 +0300
     1.3 @@ -0,0 +1,52 @@
     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 +#ifdef __cplusplus
    1.23 +extern "C" {
    1.24 +#endif	/* __cplusplus */
    1.25 +
    1.26 +static inline ray_t ray_cons(vec3_t origin, vec3_t dir)
    1.27 +{
    1.28 +	ray_t r;
    1.29 +	r.origin = origin;
    1.30 +	r.dir = dir;
    1.31 +	return r;
    1.32 +}
    1.33 +
    1.34 +#ifdef __cplusplus
    1.35 +}
    1.36 +
    1.37 +inline Ray reflect_ray(const Ray &inray, const Vector3 &norm)
    1.38 +{
    1.39 +	Ray ray = inray;
    1.40 +	ray.dir = ray.dir.reflection(norm);
    1.41 +	return ray;
    1.42 +}
    1.43 +
    1.44 +inline Ray refract_ray(const Ray &inray, const Vector3 &norm, scalar_t from_ior, scalar_t to_ior)
    1.45 +{
    1.46 +	Ray ray = inray;
    1.47 +	ray.dir = ray.dir.refraction(norm, from_ior, to_ior);
    1.48 +
    1.49 +	/* check TIR */
    1.50 +	if(dot_product(ray.dir, norm) > 0.0) {
    1.51 +		return reflect_ray(inray, norm);
    1.52 +	}
    1.53 +	return ray;
    1.54 +}
    1.55 +#endif	/* __cplusplus */