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/* RCSid $Id$ */
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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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*
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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, int ndx, double randX, 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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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,i) (*(b)->ib_vec)(v,i,(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,o) (*(b)->ob_vec)(v,o,(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,i,o) (b)->bsdf[(o)*(b)->ninc + (i)]
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/* Holder for cumulative distribution (sum of BSDF * projSA) */
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typedef struct {
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SD_CDIST_BASE; /* 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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/* Load a set of BSDF matrices from an open XML file */
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extern SDError SDloadMtx(SDData *sd, ezxml_t fl);
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/* Our matrix handling routines */
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extern SDFunc SDhandleMtx;
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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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