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/* RCSid $Id: bsdf.h,v 2.1 2009/06/12 17:37:37 greg Exp $ */
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/*
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* Header for BSDF i/o and access routines
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*/
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/* 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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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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extern int getBSDF_xfm(MAT4 xm, FVECT nrm, UpDir ud);
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