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greg |
3.14 |
/* RCSid $Id: rtmath.h,v 3.13 2021/12/03 16:50:05 greg Exp $ */
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greg |
3.1 |
/*
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* Header for Radiance vector and math routines
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*/
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#ifndef _RAD_RTMATH_H_
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#define _RAD_RTMATH_H_
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#include <math.h>
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greg |
3.4 |
#include "tiff.h" /* needed for int32, etc. */
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schorsch |
3.3 |
#include "mat4.h"
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greg |
3.1 |
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schorsch |
3.3 |
#ifdef __cplusplus
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extern "C" {
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#endif
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greg |
3.1 |
/* 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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#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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greg |
3.6 |
/* 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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greg |
3.1 |
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greg |
3.7 |
#ifdef __FAST_MATH__
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greg |
3.1 |
#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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greg |
3.14 |
/* table-based approx in tcos.c */
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greg |
3.1 |
#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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schorsch |
3.2 |
extern int quadratic(double *r, double a, double b, double c);
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greg |
3.1 |
/* 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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greg |
3.14 |
/* defined in disk2square.c */
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extern void SDsquare2disk(double ds[2], double seedx, double seedy);
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extern void SDdisk2square(double sq[2], double diskx, double disky);
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greg |
3.1 |
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#ifdef __cplusplus
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}
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#endif
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#endif /* _RAD_RTMATH_H_ */
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