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greg |
2.3 |
/* RCSid $Id: bsdf.h,v 2.2 2010/06/14 22:02:22 greg Exp $ */ |
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greg |
2.1 |
/* |
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* Header for BSDF i/o and access routines |
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*/ |
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greg |
2.2 |
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#ifndef _RAD_BSDF_H_ |
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#define _RAD_BSDF_H_ |
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greg |
2.1 |
/* up directions */ |
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typedef enum { |
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UDzneg=-3, |
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UDyneg=-2, |
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UDxneg=-1, |
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UDunknown=0, |
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UDxpos=1, |
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UDypos=2, |
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UDzpos=3 |
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} UpDir; |
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/* BSDF coordinate calculation routines */ |
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/* vectors always point away from surface */ |
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typedef int b_vecf(FVECT, int, void *); |
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typedef int b_ndxf(FVECT, void *); |
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typedef double b_radf(int, void *); |
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/* Bidirectional Scattering Distribution Function */ |
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struct BSDF_data { |
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int ninc; /* number of incoming directions */ |
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int nout; /* number of outgoing directions */ |
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greg |
2.3 |
float dim[3]; /* width, height, thickness (meters) */ |
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char *mgf; /* geometric description (if any) */ |
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greg |
2.1 |
void *ib_priv; /* input basis private data */ |
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b_vecf *ib_vec; /* get input vector from index */ |
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b_ndxf *ib_ndx; /* get input index from vector */ |
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b_radf *ib_ohm; /* get input radius for index */ |
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void *ob_priv; /* output basis private data */ |
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b_vecf *ob_vec; /* get output vector from index */ |
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b_ndxf *ob_ndx; /* get output index from vector */ |
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b_radf *ob_ohm; /* get output radius for index */ |
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float *bsdf; /* scattering distribution data */ |
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}; /* bidirectional scattering distrib. func. */ |
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#define getBSDF_incvec(v,b,i) (*(b)->ib_vec)(v,i,(b)->ib_priv) |
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#define getBSDF_incndx(b,v) (*(b)->ib_ndx)(v,(b)->ib_priv) |
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#define getBSDF_incohm(b,i) (*(b)->ib_ohm)(i,(b)->ib_priv) |
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#define getBSDF_outvec(v,b,o) (*(b)->ob_vec)(v,o,(b)->ob_priv) |
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#define getBSDF_outndx(b,v) (*(b)->ob_ndx)(v,(b)->ob_priv) |
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#define getBSDF_outohm(b,o) (*(b)->ob_ohm)(o,(b)->ob_priv) |
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#define BSDF_value(b,i,o) (b)->bsdf[(o)*(b)->ninc + (i)] |
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extern struct BSDF_data *load_BSDF(char *fname); |
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extern void free_BSDF(struct BSDF_data *b); |
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extern int r_BSDF_incvec(FVECT v, struct BSDF_data *b, int i, |
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double rv, MAT4 xm); |
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extern int r_BSDF_outvec(FVECT v, struct BSDF_data *b, int o, |
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double rv, MAT4 xm); |
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greg |
2.3 |
extern int getBSDF_xfm(MAT4 xm, FVECT nrm, UpDir ud, char *xfbuf); |
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greg |
2.2 |
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#endif /* ! _RAD_BSDF_H_ */ |
