nuclear@27: /*
nuclear@27: libvmath - a vector math library
nuclear@27: Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>
nuclear@27: 
nuclear@27: This program is free software: you can redistribute it and/or modify
nuclear@27: it under the terms of the GNU Lesser General Public License as published
nuclear@27: by the Free Software Foundation, either version 3 of the License, or
nuclear@27: (at your option) any later version.
nuclear@27: 
nuclear@27: This program is distributed in the hope that it will be useful,
nuclear@27: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@27: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@27: GNU Lesser General Public License for more details.
nuclear@27: 
nuclear@27: You should have received a copy of the GNU Lesser General Public License
nuclear@27: along with this program.  If not, see <http://www.gnu.org/licenses/>.
nuclear@27: */
nuclear@27: 
nuclear@27: #ifdef __cplusplus
nuclear@27: extern "C" {
nuclear@27: #endif	/* __cplusplus */
nuclear@27: 
nuclear@28: static VMATH_INLINE ray_t ray_cons(vec3_t origin, vec3_t dir)
nuclear@27: {
nuclear@27: 	ray_t r;
nuclear@27: 	r.origin = origin;
nuclear@27: 	r.dir = dir;
nuclear@27: 	return r;
nuclear@27: }
nuclear@27: 
nuclear@27: #ifdef __cplusplus
nuclear@27: }
nuclear@27: 
nuclear@28: VMATH_INLINE Ray reflect_ray(const Ray &inray, const Vector3 &norm)
nuclear@27: {
nuclear@27: 	Ray ray = inray;
nuclear@27: 	ray.dir = ray.dir.reflection(norm);
nuclear@27: 	return ray;
nuclear@27: }
nuclear@27: 
nuclear@28: VMATH_INLINE Ray refract_ray(const Ray &inray, const Vector3 &norm, scalar_t from_ior, scalar_t to_ior)
nuclear@27: {
nuclear@27: 	Ray ray = inray;
nuclear@27: 	ray.dir = ray.dir.refraction(norm, from_ior, to_ior);
nuclear@27: 
nuclear@27: 	/* check TIR */
nuclear@27: 	if(dot_product(ray.dir, norm) > 0.0) {
nuclear@27: 		return reflect_ray(inray, norm);
nuclear@27: 	}
nuclear@27: 	return ray;
nuclear@27: }
nuclear@27: #endif	/* __cplusplus */