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/* RCSid $Id: rtmath.h,v 3.14 2021/12/03 16:51:44 greg Exp $ */ |
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/* |
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* Header for Radiance vector and math routines |
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*/ |
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|
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#ifndef _RAD_RTMATH_H_ |
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#define _RAD_RTMATH_H_ |
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|
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#include <math.h> |
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|
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#include "tiff.h" /* needed for int32, etc. */ |
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#include "mat4.h" |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/* regular transformation */ |
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typedef struct { |
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MAT4 xfm; /* transform matrix */ |
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RREAL sca; /* scalefactor */ |
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} XF; |
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/* complemetary tranformation */ |
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typedef struct { |
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XF f; /* forward */ |
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XF b; /* backward */ |
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} FULLXF; |
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|
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#ifndef PI |
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#ifdef M_PI |
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#define PI ((double)M_PI) |
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#else |
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#define PI 3.14159265358979323846 |
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#endif |
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#endif |
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/* defined in tcos.c */ |
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extern double tcos(double x); |
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extern double atan2a(double y, double x); |
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|
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#ifdef __FAST_MATH__ |
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#define tcos cos |
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#define tsin sin |
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#define ttan tan |
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#else |
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/* table-based approx in tcos.c */ |
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#define tsin(x) tcos((x)-(PI/2.)) |
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#define ttan(x) (tsin(x)/tcos(x)) |
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#endif |
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/* defined in xf.c */ |
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extern int xf(XF *ret, int ac, char *av[]); |
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extern int invxf(XF *ret, int ac, char *av[]); |
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extern int fullxf(FULLXF *fx, int ac, char *av[]); |
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/* defined in zeroes.c */ |
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extern int quadratic(double *r, double a, double b, double c); |
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/* defined in dircode.c */ |
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extern int32 encodedir(FVECT dv); |
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extern void decodedir(FVECT dv, int32 dc); |
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extern double dir2diff(int32 dc1, int32 dc2); |
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extern double fdir2diff(int32 dc1, FVECT v2); |
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|
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _RAD_RTMATH_H_ */ |
