1 /*

2 libvmath - a vector math library

3 Copyright (C) 2004-2011 John Tsiombikas <nuclear@member.fsf.org>

4

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU Lesser General Public License as published

7 by the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

9

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU Lesser General Public License for more details.

14

15 You should have received a copy of the GNU Lesser General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18

19 #ifndef VMATH_RAY_H_

20 #define VMATH_RAY_H_

21

22 #include "matrix.h"

23 #include "vector.h"

24

25 typedef struct {

26 vec3_t origin, dir;

27 } ray_t;

28

29 #ifdef __cplusplus

30 extern "C" {

31 #endif /* __cplusplus */

32

33 static inline ray_t ray_cons(vec3_t origin, vec3_t dir);

34 ray_t ray_transform(ray_t r, mat4_t m);

35

36 #ifdef __cplusplus

37 } /* __cplusplus */

38

39 #include <stack>

40

41 class Ray {

42 private:

43 std::stack<scalar_t> ior_stack;

44

45 public:

46 /* enviornmental index of refraction, normally 1.0 */

47 static scalar_t env_ior;

48

49 Vector3 origin, dir;

50 scalar_t energy;

51 int iter;

52 scalar_t ior;

53 long time;

54

55 Ray();

56 Ray(const Vector3 &origin, const Vector3 &dir);

57

58 void transform(const Matrix4x4 &xform);

59 Ray transformed(const Matrix4x4 &xform) const;

60

61 void enter(scalar_t new_ior);

62 void leave();

63

64 scalar_t calc_ior(bool entering, scalar_t mat_ior = 1.0) const;

65 };

66

67 inline Ray reflect_ray(const Ray &inray, const Vector3 &norm);

68 inline Ray refract_ray(const Ray &inray, const Vector3 &norm, scalar_t ior, bool entering, scalar_t ray_mag = -1.0);

69 #endif /* __cplusplus */

70

71 #include "ray.inl"

72

73 #endif /* VMATH_RAY_H_ */