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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 #ifndef VMATH_RAY_H_
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20 #define VMATH_RAY_H_
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21
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22 #include "matrix.h"
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23 #include "vector.h"
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24
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25 typedef struct {
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26 vec3_t origin, dir;
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27 } ray_t;
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28
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29 #ifdef __cplusplus
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30 extern "C" {
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31 #endif /* __cplusplus */
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32
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33 static inline ray_t ray_cons(vec3_t origin, vec3_t dir);
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34 ray_t ray_transform(ray_t r, mat4_t m);
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35
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36 #ifdef __cplusplus
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37 } /* __cplusplus */
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38
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39 #include <stack>
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40
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41 class Ray {
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42 private:
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43 std::stack<scalar_t> ior_stack;
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44
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45 public:
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46 /* enviornmental index of refraction, normally 1.0 */
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47 static scalar_t env_ior;
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48
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49 Vector3 origin, dir;
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50 scalar_t energy;
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51 int iter;
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52 scalar_t ior;
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53 long time;
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54
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55 Ray();
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56 Ray(const Vector3 &origin, const Vector3 &dir);
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57
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58 void transform(const Matrix4x4 &xform);
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59 Ray transformed(const Matrix4x4 &xform) const;
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60
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61 void enter(scalar_t new_ior);
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62 void leave();
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63
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64 scalar_t calc_ior(bool entering, scalar_t mat_ior = 1.0) const;
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65 };
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66
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67 inline Ray reflect_ray(const Ray &inray, const Vector3 &norm);
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68 inline Ray refract_ray(const Ray &inray, const Vector3 &norm, scalar_t ior, bool entering, scalar_t ray_mag = -1.0);
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69 #endif /* __cplusplus */
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70
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71 #include "ray.inl"
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72
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73 #endif /* VMATH_RAY_H_ */
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