dungeon_crawler
annotate prototype/vmath/ray.inl @ 20:48cfd351a9be
mrt going on nicely
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Tue, 21 Aug 2012 04:57:33 +0300 |
| parents | |
| children |
| rev | line source |
|---|---|
| nuclear@1 | 1 /* |
| nuclear@1 | 2 libvmath - a vector math library |
| nuclear@1 | 3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org> |
| nuclear@1 | 4 |
| nuclear@1 | 5 This program is free software: you can redistribute it and/or modify |
| nuclear@1 | 6 it under the terms of the GNU Lesser General Public License as published |
| nuclear@1 | 7 by the Free Software Foundation, either version 3 of the License, or |
| nuclear@1 | 8 (at your option) any later version. |
| nuclear@1 | 9 |
| nuclear@1 | 10 This program is distributed in the hope that it will be useful, |
| nuclear@1 | 11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| nuclear@1 | 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| nuclear@1 | 13 GNU Lesser General Public License for more details. |
| nuclear@1 | 14 |
| nuclear@1 | 15 You should have received a copy of the GNU Lesser General Public License |
| nuclear@1 | 16 along with this program. If not, see <http://www.gnu.org/licenses/>. |
| nuclear@1 | 17 */ |
| nuclear@1 | 18 |
| nuclear@1 | 19 #ifdef __cplusplus |
| nuclear@1 | 20 extern "C" { |
| nuclear@1 | 21 #endif /* __cplusplus */ |
| nuclear@1 | 22 |
| nuclear@1 | 23 static inline ray_t ray_cons(vec3_t origin, vec3_t dir) |
| nuclear@1 | 24 { |
| nuclear@1 | 25 ray_t r; |
| nuclear@1 | 26 r.origin = origin; |
| nuclear@1 | 27 r.dir = dir; |
| nuclear@1 | 28 return r; |
| nuclear@1 | 29 } |
| nuclear@1 | 30 |
| nuclear@1 | 31 #ifdef __cplusplus |
| nuclear@1 | 32 } |
| nuclear@1 | 33 |
| nuclear@1 | 34 inline Ray reflect_ray(const Ray &inray, const Vector3 &norm) |
| nuclear@1 | 35 { |
| nuclear@1 | 36 Ray ray = inray; |
| nuclear@1 | 37 ray.iter--; |
| nuclear@1 | 38 ray.dir = ray.dir.reflection(norm); |
| nuclear@1 | 39 return ray; |
| nuclear@1 | 40 } |
| nuclear@1 | 41 |
| nuclear@1 | 42 inline Ray refract_ray(const Ray &inray, const Vector3 &norm, scalar_t mat_ior, bool entering, scalar_t ray_mag) |
| nuclear@1 | 43 { |
| nuclear@1 | 44 Ray ray = inray; |
| nuclear@1 | 45 ray.iter--; |
| nuclear@1 | 46 |
| nuclear@1 | 47 scalar_t ior = ray.calc_ior(entering, mat_ior); |
| nuclear@1 | 48 |
| nuclear@1 | 49 if(entering) { |
| nuclear@1 | 50 ray.enter(mat_ior); |
| nuclear@1 | 51 } else { |
| nuclear@1 | 52 ray.leave(); |
| nuclear@1 | 53 } |
| nuclear@1 | 54 |
| nuclear@1 | 55 if(ray_mag < 0.0) { |
| nuclear@1 | 56 ray_mag = ray.dir.length(); |
| nuclear@1 | 57 } |
| nuclear@1 | 58 ray.dir = (ray.dir / ray_mag).refraction(norm, ior) * ray_mag; |
| nuclear@1 | 59 |
| nuclear@1 | 60 /* check TIR */ |
| nuclear@1 | 61 if(dot_product(ray.dir, norm) > 0.0) { |
| nuclear@1 | 62 if(entering) { |
| nuclear@1 | 63 ray.leave(); |
| nuclear@1 | 64 } else { |
| nuclear@1 | 65 ray.enter(mat_ior); |
| nuclear@1 | 66 } |
| nuclear@1 | 67 } |
| nuclear@1 | 68 return ray; |
| nuclear@1 | 69 } |
| nuclear@1 | 70 #endif /* __cplusplus */ |