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/* RCSid $Id: bsdf_m.h,v 3.9 2018/01/05 21:00:24 greg Exp $ */
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/*
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* bsdf_m.h
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*
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* Support for BSDF matrices.
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* Assumes "bsdf.h" already included.
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* Include after "ezxml.h" for SDloadMtx() declaration.
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*
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* Created by Greg Ward on 2/2/11.
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*
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*/
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#ifndef _BSDF_M_H_
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#define _BSDF_M_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Fixed-position coordinate functions */
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typedef int b_vecf(FVECT vec, double ndxr, void *c_data);
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typedef int b_ndxf(const FVECT vec, void *c_data);
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typedef double b_ohmf(int ndx, void *c_data);
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/* Rectangular matrix format BSDF */
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typedef struct {
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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_ohmf *ib_ohm; /* get input proj. SA 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_ohmf *ob_ohm; /* get output proj. SA for index */
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C_CHROMA *chroma; /* chromaticity data */
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float bsdf[1]; /* scattering data (extends struct) */
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} SDMat;
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/* Matrix BSDF accessors */
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#define mBSDF_incvec(v,b,ix) (*(b)->ib_vec)(v,ix,(b)->ib_priv)
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#define mBSDF_incndx(b,v) (*(b)->ib_ndx)(v,(b)->ib_priv)
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#define mBSDF_incohm(b,i) (*(b)->ib_ohm)(i,(b)->ib_priv)
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#define mBSDF_outvec(v,b,ox) (*(b)->ob_vec)(v,ox,(b)->ob_priv)
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#define mBSDF_outndx(b,v) (*(b)->ob_ndx)(v,(b)->ob_priv)
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#define mBSDF_outohm(b,o) (*(b)->ob_ohm)(o,(b)->ob_priv)
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#define mBSDF_value(b,o,i) (b)->bsdf[(o)*(b)->ninc + (i)]
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#define mBSDF_chroma(b,o,i) (b)->chroma[(o)*(b)->ninc + (i)]
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/* Holder for cumulative distribution (sum of BSDF * projSA) */
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typedef struct SDMatCDst_s {
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SD_CDIST_BASE(SDMatCDst_s); /* base fields; must come first */
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int indx; /* incident angle index */
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void *ob_priv; /* private data for generator */
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b_vecf *ob_vec; /* outbound vector generator */
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int calen; /* cumulative array length */
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unsigned carr[1]; /* cumulative array (extends struct) */
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} SDMatCDst;
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#ifdef _EZXML_H
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/* Load a set of BSDF matrices from an open XML file */
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extern SDError SDloadMtx(SDData *sd, ezxml_t wtl);
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#endif
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/* Our matrix handling routines */
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extern const SDFunc SDhandleMtx;
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/******** Klems basis declarations for more intimate access ********/
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#define MAXLATS 46 /* maximum number of latitudes */
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/* BSDF angle specification */
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typedef struct {
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char name[64]; /* basis name */
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int nangles; /* total number of directions */
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struct {
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float tmin; /* starting theta */
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int nphis; /* number of phis (0 term) */
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} lat[MAXLATS+1]; /* latitudes */
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} ANGLE_BASIS;
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#define MAXABASES 7 /* limit on defined bases */
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extern ANGLE_BASIS abase_list[MAXABASES];
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extern int nabases; /* current number of defined bases */
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extern C_COLOR mtx_RGB_prim[3]; /* matrix RGB primaries */
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extern float mtx_RGB_coef[3]; /* corresponding Y coefficients */
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/* Get color or grayscale value for BSDF in the given directions */
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extern int mBSDF_color(float coef[], const SDMat *b, int i, int o);
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/* Get vector for this angle basis index (front exiting) */
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extern b_vecf fo_getvec;
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/* Get index corresponding to the given vector (front exiting) */
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extern b_ndxf fo_getndx;
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/* Get projected solid angle for this angle basis index (universal) */
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extern b_ohmf io_getohm;
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/* Get vector for this angle basis index (back incident) */
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extern b_vecf bi_getvec;
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/* Get index corresponding to the vector (back incident) */
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extern b_ndxf bi_getndx;
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/* Get vector for this angle basis index (back exiting) */
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extern b_vecf bo_getvec;
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/* Get index corresponding to the vector (back exiting) */
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extern b_ndxf bo_getndx;
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/* Get vector for this angle basis index (front incident) */
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extern b_vecf fi_getvec;
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/* Get index corresponding to the vector (front incident) */
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extern b_ndxf fi_getndx;
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#ifdef __cplusplus
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}
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#endif
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#endif /* ! _BSDF_M_H_ */
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