| 1 |
/* RCSid $Id: rtmath.h,v 3.6 2013/02/08 16:10:07 greg Exp $ */ |
| 2 |
/* |
| 3 |
* Header for Radiance vector and math routines |
| 4 |
*/ |
| 5 |
|
| 6 |
#ifndef _RAD_RTMATH_H_ |
| 7 |
#define _RAD_RTMATH_H_ |
| 8 |
|
| 9 |
#include <math.h> |
| 10 |
|
| 11 |
#include "tiff.h" /* needed for int32, etc. */ |
| 12 |
#include "mat4.h" |
| 13 |
|
| 14 |
#ifdef __cplusplus |
| 15 |
extern "C" { |
| 16 |
#endif |
| 17 |
|
| 18 |
/* regular transformation */ |
| 19 |
typedef struct { |
| 20 |
MAT4 xfm; /* transform matrix */ |
| 21 |
RREAL sca; /* scalefactor */ |
| 22 |
} XF; |
| 23 |
/* complemetary tranformation */ |
| 24 |
typedef struct { |
| 25 |
XF f; /* forward */ |
| 26 |
XF b; /* backward */ |
| 27 |
} FULLXF; |
| 28 |
|
| 29 |
#ifndef PI |
| 30 |
#ifdef M_PI |
| 31 |
#define PI ((double)M_PI) |
| 32 |
#else |
| 33 |
#define PI 3.14159265358979323846 |
| 34 |
#endif |
| 35 |
#endif |
| 36 |
/* defined in tcos.c */ |
| 37 |
extern double tcos(double x); |
| 38 |
extern double atan2a(double y, double x); |
| 39 |
|
| 40 |
#ifdef __FAST_MATH__ |
| 41 |
#define tcos cos |
| 42 |
#define tsin sin |
| 43 |
#define ttan tan |
| 44 |
#else |
| 45 |
/* table-based cosine approximation */ |
| 46 |
#define tsin(x) tcos((x)-(PI/2.)) |
| 47 |
#define ttan(x) (tsin(x)/tcos(x)) |
| 48 |
#endif |
| 49 |
/* defined in xf.c */ |
| 50 |
extern int xf(XF *ret, int ac, char *av[]); |
| 51 |
extern int invxf(XF *ret, int ac, char *av[]); |
| 52 |
extern int fullxf(FULLXF *fx, int ac, char *av[]); |
| 53 |
/* defined in zeroes.c */ |
| 54 |
extern int quadratic(double *r, double a, double b, double c); |
| 55 |
/* defined in dircode.c */ |
| 56 |
extern int32 encodedir(FVECT dv); |
| 57 |
extern void decodedir(FVECT dv, int32 dc); |
| 58 |
extern double dir2diff(int32 dc1, int32 dc2); |
| 59 |
extern double fdir2diff(int32 dc1, FVECT v2); |
| 60 |
|
| 61 |
#ifdef __cplusplus |
| 62 |
} |
| 63 |
#endif |
| 64 |
#endif /* _RAD_RTMATH_H_ */ |
| 65 |
|
