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/* RCSid $Id: bsdf_t.h,v 3.7 2011/04/27 20:03:25 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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|
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#ifndef _BSDF_T_H_ |
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#define _BSDF_T_H_ |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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#define SD_MAXDIM 4 /* maximum expected # dimensions */ |
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|
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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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|
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#define SD_UFRONT 0x1 /* flag for BSDF uses front side */ |
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#define SD_UBACK 0x2 /* flag for BSDF uses back side */ |
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#define SD_XMIT 0x3 /* combine the two for transmission */ |
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|
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/* Variable-resolution BSDF holder */ |
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typedef struct { |
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int sidef; /* transmitted component? */ |
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SDNode *st; /* BSDF tree */ |
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} SDTre; |
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|
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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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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 side(s) to use */ |
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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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|
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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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|
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/* Our matrix handling routines */ |
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extern SDFunc SDhandleTre; |
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|
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* ! _BSDF_T_H_ */ |
