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/* RCSid $Id: bsdf_t.h,v 3.12 2015/04/05 01:32:01 greg Exp $ */
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/*
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* bsdf_t.h
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*
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* Support for variable-resolution BSDF trees.
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* Assumes "bsdf.h" already included.
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* Include after "ezxml.h" for SDloadTre() 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_T_H_
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#define _BSDF_T_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define SD_MAXDIM 4 /* maximum expected # dimensions */
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/* Basic node structure for variable-resolution BSDF data */
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typedef struct SDNode_s {
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short ndim; /* number of dimensions */
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short log2GR; /* log(2) of grid resolution (< 0 for tree) */
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union {
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struct SDNode_s *t[1]; /* subtree pointers */
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float v[1]; /* scattering value(s) */
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} u; /* subtrees or values (extends struct) */
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} SDNode;
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#define SD_FREFL 1 /* component reflects off front side */
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#define SD_BREFL 2 /* component reflects off back side */
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#define SD_FXMIT 3 /* component transmits through front side */
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#define SD_BXMIT 4 /* component transmits through back side */
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/* Variable-resolution BSDF holder */
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typedef struct {
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int sidef; /* which component */
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SDNode *stc[3]; /* BSDF (Y,u,v) trees */
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} SDTre;
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/* Holder for cumulative distribution (sum of BSDF * projSA) */
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typedef struct SDTreCDst_s {
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/* base fields; must come first */
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SD_CDIST_BASE(SDTreCDst_s);
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double clim[2][2]; /* input coordinate limits */
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double max_psa; /* maximum projected solid angle */
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short sidef; /* which mode is in play */
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short isodist; /* isotropic distribution? */
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int calen; /* cumulative array length */
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struct {
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unsigned hndx; /* hilbert index */
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unsigned cuml; /* cumulative value */
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} carr[1]; /* cumulative array (extends struct) */
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} SDTreCDst;
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#ifdef _EZXML_H
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/* Load a variable-resolution BSDF tree from an open XML file */
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extern SDError SDloadTre(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 SDhandleTre;
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#ifdef __cplusplus
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}
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#endif
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#endif /* ! _BSDF_T_H_ */
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