Open Source Tomb Raider Engine
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math.h 2.1KB

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  1. /*!
  2. *
  3. * \file include/math/math.h
  4. * \brief Vector and Matrix math
  5. *
  6. * \author Mongoose
  7. * \author xythobuz
  8. */
  9. #include <math.h>
  10. #ifndef _MATH_MATH_H
  11. #define _MATH_MATH_H
  12. #ifndef M_PI
  13. #define M_PI 3.14159265358979323846
  14. #endif
  15. #define OR_PI ((float)M_PI) //!< pi
  16. #define OR_2_PI (OR_PI * 2.0f) //!< pi*2
  17. #define OR_PI_OVER_4 (OR_PI / 4.0f) //!< pi/4
  18. #define OR_PI_OVER_180 (OR_PI / 180.0f) //!< pi/180
  19. #define OR_180_OVER_PI (180.0f / OR_PI) //!< 180/pi
  20. #define OR_RAD_TO_DEG(x) ((x) * OR_180_OVER_PI) //!< Convert radians to degrees
  21. #define OR_DEG_TO_RAD(x) ((x) * OR_PI_OVER_180) //!< Convert degrees to radians
  22. typedef float vec_t; //!< 1D Vector, aka float
  23. typedef float vec2_t[2]; //!< 2D Vector
  24. typedef float vec3_t[3]; //!< 3D Vector
  25. typedef float vec4_t[4]; //!< 4D Vector
  26. typedef vec_t matrix_t[16]; //!< Used as _Column_major_ in every class now!
  27. /*!
  28. * \brief Compare two floats with an Epsilon.
  29. * \param a first float
  30. * \param b second float
  31. * \returns true if a and b are probably the same.
  32. */
  33. bool equalEpsilon(vec_t a, vec_t b);
  34. /*!
  35. * \brief Calculate Intersection of a line and a polygon
  36. * \param intersect Where the intersection is stored, if it exists
  37. * \param p1 First point of line segment
  38. * \param p2 Second point of line segment
  39. * \param polygon polygon vertex array (0 to 2 are used)
  40. * \returns 0 if there is no intersection
  41. */
  42. int intersectionLinePolygon(vec3_t intersect, vec3_t p1, vec3_t p2, vec3_t *polygon);
  43. /*!
  44. * \brief Calculate the length of a line segment / the distance between two points
  45. * \param a First point
  46. * \param b Second point
  47. * \returns distance/length
  48. */
  49. vec_t distance(const vec3_t a, const vec3_t b);
  50. /*!
  51. * \brief Calculates the midpoint between two points / of a line segment
  52. * \param a First point
  53. * \param b Second point
  54. * \param mid Midpoint will be stored here
  55. */
  56. void midpoint(const vec3_t a, const vec3_t b, vec3_t mid);
  57. /*!
  58. * \brief Calculates a pseudo-random number
  59. * \param from Lower bound of resulting number
  60. * \param to Upper bound
  61. * \returns random number
  62. */
  63. vec_t randomNum(vec_t from, vec_t to);
  64. #endif