| 1 |
/* RCSid $Id: bsdf.h,v 2.2 2010/06/14 22:02:22 greg Exp $ */ |
| 2 |
/* |
| 3 |
* Header for BSDF i/o and access routines |
| 4 |
*/ |
| 5 |
|
| 6 |
#ifndef _RAD_BSDF_H_ |
| 7 |
#define _RAD_BSDF_H_ |
| 8 |
/* up directions */ |
| 9 |
typedef enum { |
| 10 |
UDzneg=-3, |
| 11 |
UDyneg=-2, |
| 12 |
UDxneg=-1, |
| 13 |
UDunknown=0, |
| 14 |
UDxpos=1, |
| 15 |
UDypos=2, |
| 16 |
UDzpos=3 |
| 17 |
} UpDir; |
| 18 |
/* BSDF coordinate calculation routines */ |
| 19 |
/* vectors always point away from surface */ |
| 20 |
typedef int b_vecf(FVECT, int, void *); |
| 21 |
typedef int b_ndxf(FVECT, void *); |
| 22 |
typedef double b_radf(int, void *); |
| 23 |
|
| 24 |
/* Bidirectional Scattering Distribution Function */ |
| 25 |
struct BSDF_data { |
| 26 |
int ninc; /* number of incoming directions */ |
| 27 |
int nout; /* number of outgoing directions */ |
| 28 |
float dim[3]; /* width, height, thickness (meters) */ |
| 29 |
char *mgf; /* geometric description (if any) */ |
| 30 |
void *ib_priv; /* input basis private data */ |
| 31 |
b_vecf *ib_vec; /* get input vector from index */ |
| 32 |
b_ndxf *ib_ndx; /* get input index from vector */ |
| 33 |
b_radf *ib_ohm; /* get input radius for index */ |
| 34 |
void *ob_priv; /* output basis private data */ |
| 35 |
b_vecf *ob_vec; /* get output vector from index */ |
| 36 |
b_ndxf *ob_ndx; /* get output index from vector */ |
| 37 |
b_radf *ob_ohm; /* get output radius for index */ |
| 38 |
float *bsdf; /* scattering distribution data */ |
| 39 |
}; /* bidirectional scattering distrib. func. */ |
| 40 |
|
| 41 |
#define getBSDF_incvec(v,b,i) (*(b)->ib_vec)(v,i,(b)->ib_priv) |
| 42 |
#define getBSDF_incndx(b,v) (*(b)->ib_ndx)(v,(b)->ib_priv) |
| 43 |
#define getBSDF_incohm(b,i) (*(b)->ib_ohm)(i,(b)->ib_priv) |
| 44 |
#define getBSDF_outvec(v,b,o) (*(b)->ob_vec)(v,o,(b)->ob_priv) |
| 45 |
#define getBSDF_outndx(b,v) (*(b)->ob_ndx)(v,(b)->ob_priv) |
| 46 |
#define getBSDF_outohm(b,o) (*(b)->ob_ohm)(o,(b)->ob_priv) |
| 47 |
#define BSDF_value(b,i,o) (b)->bsdf[(o)*(b)->ninc + (i)] |
| 48 |
|
| 49 |
extern struct BSDF_data *load_BSDF(char *fname); |
| 50 |
extern void free_BSDF(struct BSDF_data *b); |
| 51 |
extern int r_BSDF_incvec(FVECT v, struct BSDF_data *b, int i, |
| 52 |
double rv, MAT4 xm); |
| 53 |
extern int r_BSDF_outvec(FVECT v, struct BSDF_data *b, int o, |
| 54 |
double rv, MAT4 xm); |
| 55 |
extern int getBSDF_xfm(MAT4 xm, FVECT nrm, UpDir ud, char *xfbuf); |
| 56 |
|
| 57 |
#endif /* ! _RAD_BSDF_H_ */ |
