src/common/bsdf.h

/* RCSid $Id: bsdf.h,v 2.14 2011/06/08 15:37:46 greg Exp $ */
/*
 *  bsdf.h
 *  
 *  Declarations for bidirectional scattering distribution functions.
 *  Assumes <stdio.h> already included.
 *
 *  A material is oriented in right-hand coordinate system with X-axis
 *      in the surface plane pointed to the right as seen from the front.
 *      This means the Y-axis is "up" and the Z-axis is the surface normal.
 *
 *  Note that we reverse the identification of "front" and "back" from
 *      the conventions used in WINDOW 6.  "Front" in our library points
 *      in the +Z direction, towards the interior of the space rather
 *      than the exterior.
 *
 *  BSDF incident & exiting vectors are always oriented away from surface.
 *
 *  Created by Greg Ward on 1/10/11.
 *
 */

#ifndef _BSDF_H_
#define _BSDF_H_

#include "fvect.h"
#include "ccolor.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifdef _WIN32
#define strcasecmp      stricmp
#endif

#define SDnameLn        128             /* maximum BSDF name length */
#define SDmaxCh         3               /* maximum # spectral channels */

/* Component flags for SDsampBSDF() and SDdirectHemi() */
#define SDsampR         0x1             /* include reflection */
#define SDsampT         0x2             /* include transmission */
#define SDsampS         0x3             /* include scattering (R+T) */
#define SDsampSp        0x4             /* include non-diffuse portion */
#define SDsampDf        0x8             /* include diffuse portion */
#define SDsampSpR       0x5             /* include non-diffuse reflection */
#define SDsampSpT       0x6             /* include non-diffuse transmission */
#define SDsampSpS       0x7             /* include non-diffuse scattering */
#define SDsampAll       0xF             /* include everything */

/* Projected solid angle query flags for SDsizeBSDF() */
#define SDqueryVal      0x0             /* query single value */
#define SDqueryMin      0x1             /* query minimum proj. solid angle */
#define SDqueryMax      0x2             /* query maximum proj. solid angle */

/* Error codes: normal return, out of memory, file i/o, file format, bad argument,
                 bad data, unsupported feature, internal error, unknown error */
typedef enum {SDEnone=0, SDEmemory, SDEfile, SDEformat, SDEargument,
                SDEdata, SDEsupport, SDEinternal, SDEunknown} SDError;

/* English ASCII strings corresponding to ennumerated errors */
extern const char       *SDerrorEnglish[];

/* Additional information on last error (ASCII English) */
extern char             SDerrorDetail[];

/* Holder for BSDF value and spectral color */
typedef struct {
        double          cieY;           /* photopic BSDF (Y) value */
        C_COLOR         spec;           /* spectral and (x,y) color */
} SDValue;

/* Cached, encoded, cumulative distribution for one incident (solid) angle */
#define SD_CDIST_BASE   double          cTotal; \
                        struct SDCDst_s *next
typedef struct SDCDst_s {
        SD_CDIST_BASE;                  /* base fields first */
        /* ...encoded distribution extends struct */
} SDCDst;

/* Forward declaration of BSDF component */
typedef struct SDComp_s SDComponent;

/* Methods needed to handle BSDF components (nothing is optional) */
typedef const struct {
                                        /* return non-diffuse BSDF */
        int             (*getBSDFs)(float coef[SDmaxCh], const FVECT outVec,
                                    const FVECT inVec, SDComponent *sdc);
                                        /* query non-diffuse PSA for vector */
        SDError         (*queryProjSA)(double *psa, const FVECT v1,
                                                const RREAL *v2, int qflags,
                                                SDComponent *sdc);
                                        /* get cumulative distribution */
        const SDCDst    *(*getCDist)(const FVECT inVec, SDComponent *sdc);
                                        /* sample cumulative distribution */
        SDError         (*sampCDist)(FVECT ioVec, double randX,
                                                const SDCDst *cdp);
                                        /* free a spectral BSDF component */
        void            (*freeSC)(void *dist);
} SDFunc;

/* Structure to hold a spectral BSDF component (typedef SDComponent above) */
struct SDComp_s {
        C_COLOR         cspec[SDmaxCh]; /* component spectral bases */
        SDFunc          *func;          /* methods for this component */
        void            *dist;          /* loaded distribution data */
        SDCDst          *cdList;        /* cumulative distribution cache */
};

/* Container for non-diffuse BSDF components */
typedef struct {
        double          minProjSA;      /* minimum projected solid angle */
        double          maxHemi;        /* maximum directional hemispherical */
        int             ncomp;          /* number of separate components */
        SDComponent     comp[1];        /* BSDF components (extends struct) */
} SDSpectralDF;

/* Loaded BSDF data */
typedef struct {
        char            name[SDnameLn]; /* BSDF name (usu. derived from file) */
        char            *mgf;           /* geometric description (if any) */
        float           dim[3];         /* width, height, thickness (meters) */
        SDValue         rLambFront;     /* diffuse front reflectance */
        SDValue         rLambBack;      /* diffuse rear reflectance */
        SDValue         tLamb;          /* diffuse transmission */
        SDSpectralDF    *rf, *rb, *tf;  /* non-diffuse BSDF components */
} SDData;

/* List of loaded BSDFs */
extern struct SDCache_s {
        SDData          bsdf;           /* BSDF data */
        unsigned        refcnt;         /* how many callers are using us? */
        struct SDCache_s                /* next in cache list */
                        *next;
} *SDcacheList;         /* Global BSDF cache */

/* BSDF cache retention policies */
#define SDretainNone    0               /* free unreferenced BSDF data */
#define SDretainBSDFs   1               /* keep loaded BSDFs in memory */
#define SDretainAll     2               /* also keep cumulative cache data */

extern int              SDretainSet;    /* =SDretainNone by default */

/*****************************************************************
 * The following routines are less commonly used by applications.
 */

#define SDisLoaded(sd)  ((sd)->rLambFront.spec.flags != 0)

/* Report an error to the indicated stream (in English) */
extern SDError          SDreportEnglish(SDError ec, FILE *fp);

/* Shorten file path to useable BSDF name, removing suffix */
extern void             SDclipName(char res[SDnameLn], const char *fname);

/* Allocate new spectral distribution function */
extern SDSpectralDF     *SDnewSpectralDF(int nc);

/* Free a spectral distribution function */
extern void             SDfreeSpectralDF(SDSpectralDF *df);

/* Initialize an unused BSDF struct and assign name (calls SDclipName) */
extern void             SDclearBSDF(SDData *sd, const char *fname);

/* Load a BSDF struct from the given file (keeps name unchanged) */
extern SDError          SDloadFile(SDData *sd, const char *fname);

/* Free data associated with BSDF struct */
extern void             SDfreeBSDF(SDData *sd);

/* Find writeable BSDF by name, or allocate new cache entry if absent */
extern SDData           *SDgetCache(const char *bname);

/* Free cached cumulative distributions for BSDF component */
extern void             SDfreeCumulativeCache(SDSpectralDF *df);

/* Sample an individual BSDF component */
extern SDError          SDsampComponent(SDValue *sv, FVECT ioVec,
                                        double randX, SDComponent *sdc);

/* Convert 1-dimensional random variable to N-dimensional */
extern void             SDmultiSamp(double t[], int n, double randX);

/* Map a [0,1]^2 square to a unit radius disk */
void                    SDsquare2disk(double ds[2], double seedx, double seedy);

/* Map point on unit disk to a unit square in [0,1]^2 range */
void                    SDdisk2square(double sq[2], double diskx, double disky);

/*****************************************************************
 * The calls below are the ones most applications require.
 * All directions are assumed to be unit vectors.
 */

/* Get BSDF from cache (or load and cache it on first call) */
/* Report any problems to stderr (in English), return NULL on failure */
extern const SDData     *SDcacheFile(const char *fname);

/* Free a BSDF from our cache (clear all if sd==NULL) */
extern void             SDfreeCache(const SDData *sd);

/* Query projected solid angle resolution for non-diffuse BSDF direction(s) */
extern SDError          SDsizeBSDF(double *projSA, const FVECT v1,
                                        const RREAL *v2, int qflags,
                                        const SDData *sd);

/* Return BSDF for the given incident and scattered ray vectors */
extern SDError          SDevalBSDF(SDValue *sv, const FVECT outVec,
                                        const FVECT inVec, const SDData *sd);

/* Compute directional hemispherical scattering at given incident angle */
extern double           SDdirectHemi(const FVECT inVec,
                                        int sflags, const SDData *sd);

/* Sample BSDF direction based on the given random variable */
extern SDError          SDsampBSDF(SDValue *sv, FVECT ioVec, double randX,
                                        int sflags, const SDData *sd);

/*****************************************************************
 * Vector math for getting between world and local BSDF coordinates.
 * Directions may be passed unnormalized to these routines.
 */

/* Compute World->BSDF transform from surface normal and BSDF up vector */
extern SDError          SDcompXform(RREAL vMtx[3][3], const FVECT sNrm,
                                        const FVECT uVec);

/* Compute inverse transform */
extern SDError          SDinvXform(RREAL iMtx[3][3], RREAL vMtx[3][3]);

/* Transform and normalize direction (column) vector */
extern SDError          SDmapDir(FVECT resVec, RREAL vMtx[3][3],
                                        const FVECT inpVec);

/* Application-specific BSDF loading routine (not part of our library) */
extern SDData           *loadBSDF(char *name);

/* Application-specific BSDF error translator (not part of our library) */
extern char             *transSDError(SDError ec);

/*################################################################*/
/*######### DEPRECATED DEFINITIONS AWAITING PERMANENT REMOVAL #######*/
/*
 * Header for BSDF i/o and access routines
 */

#include "mat4.h"
                                /* up directions */
typedef enum {
        UDzneg=-3,
        UDyneg=-2,
        UDxneg=-1,
        UDunknown=0,
        UDxpos=1,
        UDypos=2,
        UDzpos=3
} UpDir;
                                /* BSDF coordinate calculation routines */
                                /* vectors always point away from surface */

typedef int     b_vecf2(FVECT v, int n, void *cd);
typedef int     b_ndxf2(FVECT v, void *cd);
typedef double  b_radf2(int n, void *cd);

/* Bidirectional Scattering Distribution Function */
struct BSDF_data {
        int     ninc;                   /* number of incoming directions */
        int     nout;                   /* number of outgoing directions */
        float   dim[3];                 /* width, height, thickness (meters) */
        char    *mgf;                   /* geometric description (if any) */
        void    *ib_priv;               /* input basis private data */
        b_vecf2 *ib_vec;                /* get input vector from index */
        b_ndxf2 *ib_ndx;                /* get input index from vector */
        b_radf2 *ib_ohm;                /* get input radius for index */
        void    *ob_priv;               /* output basis private data */
        b_vecf2 *ob_vec;                /* get output vector from index */
        b_ndxf2 *ob_ndx;                /* get output index from vector */
        b_radf2 *ob_ohm;                /* get output radius for index */
        float   *bsdf;                  /* scattering distribution data */
};                              /* bidirectional scattering distrib. func. */

#define getBSDF_incvec(v,b,i)   (*(b)->ib_vec)(v,i,(b)->ib_priv)
#define getBSDF_incndx(b,v)     (*(b)->ib_ndx)(v,(b)->ib_priv)
#define getBSDF_incohm(b,i)     (*(b)->ib_ohm)(i,(b)->ib_priv)
#define getBSDF_outvec(v,b,o)   (*(b)->ob_vec)(v,o,(b)->ob_priv)
#define getBSDF_outndx(b,v)     (*(b)->ob_ndx)(v,(b)->ob_priv)
#define getBSDF_outohm(b,o)     (*(b)->ob_ohm)(o,(b)->ob_priv)
#define BSDF_value(b,i,o)       (b)->bsdf[(o)*(b)->ninc + (i)]

extern struct BSDF_data *load_BSDF(char *fname);
extern void free_BSDF(struct BSDF_data *b);
extern int r_BSDF_incvec(FVECT v, struct BSDF_data *b, int i,
                                double rv, MAT4 xm);
extern int r_BSDF_outvec(FVECT v, struct BSDF_data *b, int o,
                                double rv, MAT4 xm);
extern int getBSDF_xfm(MAT4 xm, FVECT nrm, UpDir ud, char *xfbuf);

/*######### END DEPRECATED DEFINITIONS #######*/
/*################################################################*/

#ifdef __cplusplus
}
#endif
#endif  /* ! _BSDF_H_ */
Revision:	2.15
Committed:	Thu Jun 9 17:09:39 2011 UTC (12 years, 11 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.14:	+5 -1 lines
Log Message:	Fixes for Windows and bug fix in bsdf_m.c
#	User	Rev	Content
1	greg	2.15	/* RCSid $Id: bsdf.h,v 2.14 2011/06/08 15:37:46 greg Exp $ */
2	greg	2.4	/*
3			* bsdf.h
4			*
5			* Declarations for bidirectional scattering distribution functions.
6			* Assumes <stdio.h> already included.
7			*
8			* A material is oriented in right-hand coordinate system with X-axis
9			* in the surface plane pointed to the right as seen from the front.
10			* This means the Y-axis is "up" and the Z-axis is the surface normal.
11			*
12	greg	2.8	* Note that we reverse the identification of "front" and "back" from
13			* the conventions used in WINDOW 6. "Front" in our library points
14			* in the +Z direction, towards the interior of the space rather
15			* than the exterior.
16			*
17	greg	2.13	* BSDF incident & exiting vectors are always oriented away from surface.
18	greg	2.4	*
19			* Created by Greg Ward on 1/10/11.
20			*
21			*/
22
23			#ifndef _BSDF_H_
24			#define _BSDF_H_
25
26			#include "fvect.h"
27			#include "ccolor.h"
28
29			#ifdef __cplusplus
30			extern "C" {
31			#endif
32
33	greg	2.15	#ifdef _WIN32
34			#define strcasecmp stricmp
35			#endif
36
37	greg	2.4	#define SDnameLn 128 /* maximum BSDF name length */
38			#define SDmaxCh 3 /* maximum # spectral channels */
39
40	greg	2.9	/* Component flags for SDsampBSDF() and SDdirectHemi() */
41	greg	2.4	#define SDsampR 0x1 /* include reflection */
42			#define SDsampT 0x2 /* include transmission */
43			#define SDsampS 0x3 /* include scattering (R+T) */
44			#define SDsampSp 0x4 /* include non-diffuse portion */
45			#define SDsampDf 0x8 /* include diffuse portion */
46			#define SDsampSpR 0x5 /* include non-diffuse reflection */
47			#define SDsampSpT 0x6 /* include non-diffuse transmission */
48			#define SDsampSpS 0x7 /* include non-diffuse scattering */
49			#define SDsampAll 0xF /* include everything */
50
51	greg	2.9	/* Projected solid angle query flags for SDsizeBSDF() */
52	greg	2.7	#define SDqueryVal 0x0 /* query single value */
53			#define SDqueryMin 0x1 /* query minimum proj. solid angle */
54			#define SDqueryMax 0x2 /* query maximum proj. solid angle */
55	greg	2.4
56			/* Error codes: normal return, out of memory, file i/o, file format, bad argument,
57			bad data, unsupported feature, internal error, unknown error */
58			typedef enum {SDEnone=0, SDEmemory, SDEfile, SDEformat, SDEargument,
59			SDEdata, SDEsupport, SDEinternal, SDEunknown} SDError;
60
61			/* English ASCII strings corresponding to ennumerated errors */
62			extern const char *SDerrorEnglish[];
63
64			/* Additional information on last error (ASCII English) */
65			extern char SDerrorDetail[];
66
67			/* Holder for BSDF value and spectral color */
68			typedef struct {
69			double cieY; /* photopic BSDF (Y) value */
70			C_COLOR spec; /* spectral and (x,y) color */
71			} SDValue;
72
73			/* Cached, encoded, cumulative distribution for one incident (solid) angle */
74			#define SD_CDIST_BASE double cTotal; \
75			struct SDCDst_s *next
76			typedef struct SDCDst_s {
77			SD_CDIST_BASE; /* base fields first */
78			/* ...encoded distribution extends struct */
79			} SDCDst;
80
81			/* Forward declaration of BSDF component */
82			typedef struct SDComp_s SDComponent;
83
84			/* Methods needed to handle BSDF components (nothing is optional) */
85			typedef const struct {
86			/* return non-diffuse BSDF */
87			int (*getBSDFs)(float coef[SDmaxCh], const FVECT outVec,
88	greg	2.12	const FVECT inVec, SDComponent *sdc);
89	greg	2.4	/* query non-diffuse PSA for vector */
90	greg	2.11	SDError (queryProjSA)(double psa, const FVECT v1,
91			const RREAL *v2, int qflags,
92	greg	2.12	SDComponent *sdc);
93	greg	2.4	/* get cumulative distribution */
94			const SDCDst (getCDist)(const FVECT inVec, SDComponent *sdc);
95			/* sample cumulative distribution */
96	greg	2.12	SDError (*sampCDist)(FVECT ioVec, double randX,
97	greg	2.4	const SDCDst *cdp);
98			/* free a spectral BSDF component */
99			void (freeSC)(void dist);
100			} SDFunc;
101
102			/* Structure to hold a spectral BSDF component (typedef SDComponent above) */
103			struct SDComp_s {
104			C_COLOR cspec[SDmaxCh]; /* component spectral bases */
105			SDFunc func; / methods for this component */
106			void dist; / loaded distribution data */
107			SDCDst cdList; / cumulative distribution cache */
108			};
109
110			/* Container for non-diffuse BSDF components */
111			typedef struct {
112			double minProjSA; /* minimum projected solid angle */
113			double maxHemi; /* maximum directional hemispherical */
114			int ncomp; /* number of separate components */
115			SDComponent comp[1]; /* BSDF components (extends struct) */
116			} SDSpectralDF;
117
118			/* Loaded BSDF data */
119			typedef struct {
120	greg	2.13	char name[SDnameLn]; /* BSDF name (usu. derived from file) */
121	greg	2.4	char mgf; / geometric description (if any) */
122			float dim[3]; /* width, height, thickness (meters) */
123			SDValue rLambFront; /* diffuse front reflectance */
124			SDValue rLambBack; /* diffuse rear reflectance */
125			SDValue tLamb; /* diffuse transmission */
126			SDSpectralDF rf, rb, tf; / non-diffuse BSDF components */
127			} SDData;
128
129			/* List of loaded BSDFs */
130			extern struct SDCache_s {
131			SDData bsdf; /* BSDF data */
132			unsigned refcnt; /* how many callers are using us? */
133			struct SDCache_s /* next in cache list */
134			*next;
135			} SDcacheList; / Global BSDF cache */
136
137	greg	2.14	/* BSDF cache retention policies */
138			#define SDretainNone 0 /* free unreferenced BSDF data */
139			#define SDretainBSDFs 1 /* keep loaded BSDFs in memory */
140	greg	2.4	#define SDretainAll 2 /* also keep cumulative cache data */
141
142	greg	2.13	extern int SDretainSet; /* =SDretainNone by default */
143	greg	2.4
144			/*****************************************************************
145			* The following routines are less commonly used by applications.
146			*/
147
148	greg	2.6	#define SDisLoaded(sd) ((sd)->rLambFront.spec.flags != 0)
149	greg	2.4
150			/* Report an error to the indicated stream (in English) */
151			extern SDError SDreportEnglish(SDError ec, FILE *fp);
152
153			/* Shorten file path to useable BSDF name, removing suffix */
154			extern void SDclipName(char res[SDnameLn], const char *fname);
155
156			/* Allocate new spectral distribution function */
157			extern SDSpectralDF *SDnewSpectralDF(int nc);
158
159			/* Free a spectral distribution function */
160			extern void SDfreeSpectralDF(SDSpectralDF *df);
161
162	greg	2.10	/* Initialize an unused BSDF struct and assign name (calls SDclipName) */
163			extern void SDclearBSDF(SDData sd, const char fname);
164	greg	2.4
165			/* Load a BSDF struct from the given file (keeps name unchanged) */
166			extern SDError SDloadFile(SDData sd, const char fname);
167
168			/* Free data associated with BSDF struct */
169			extern void SDfreeBSDF(SDData *sd);
170
171			/* Find writeable BSDF by name, or allocate new cache entry if absent */
172			extern SDData SDgetCache(const char bname);
173
174			/* Free cached cumulative distributions for BSDF component */
175			extern void SDfreeCumulativeCache(SDSpectralDF *df);
176
177			/* Sample an individual BSDF component */
178	greg	2.12	extern SDError SDsampComponent(SDValue *sv, FVECT ioVec,
179			double randX, SDComponent *sdc);
180	greg	2.4
181			/* Convert 1-dimensional random variable to N-dimensional */
182			extern void SDmultiSamp(double t[], int n, double randX);
183
184			/* Map a [0,1]^2 square to a unit radius disk */
185			void SDsquare2disk(double ds[2], double seedx, double seedy);
186
187			/* Map point on unit disk to a unit square in [0,1]^2 range */
188			void SDdisk2square(double sq[2], double diskx, double disky);
189
190			/*****************************************************************
191			* The calls below are the ones most applications require.
192			* All directions are assumed to be unit vectors.
193			*/
194
195			/* Get BSDF from cache (or load and cache it on first call) */
196	greg	2.13	/* Report any problems to stderr (in English), return NULL on failure */
197	greg	2.4	extern const SDData SDcacheFile(const char fname);
198
199	greg	2.13	/* Free a BSDF from our cache (clear all if sd==NULL) */
200	greg	2.4	extern void SDfreeCache(const SDData *sd);
201
202	greg	2.11	/* Query projected solid angle resolution for non-diffuse BSDF direction(s) */
203			extern SDError SDsizeBSDF(double *projSA, const FVECT v1,
204			const RREAL *v2, int qflags,
205			const SDData *sd);
206	greg	2.4
207			/* Return BSDF for the given incident and scattered ray vectors */
208			extern SDError SDevalBSDF(SDValue *sv, const FVECT outVec,
209			const FVECT inVec, const SDData *sd);
210
211			/* Compute directional hemispherical scattering at given incident angle */
212			extern double SDdirectHemi(const FVECT inVec,
213			int sflags, const SDData *sd);
214
215			/* Sample BSDF direction based on the given random variable */
216	greg	2.12	extern SDError SDsampBSDF(SDValue *sv, FVECT ioVec, double randX,
217	greg	2.4	int sflags, const SDData *sd);
218
219			/*****************************************************************
220			* Vector math for getting between world and local BSDF coordinates.
221			* Directions may be passed unnormalized to these routines.
222			*/
223
224	greg	2.13	/* Compute World->BSDF transform from surface normal and BSDF up vector */
225	greg	2.4	extern SDError SDcompXform(RREAL vMtx[3][3], const FVECT sNrm,
226			const FVECT uVec);
227
228			/* Compute inverse transform */
229			extern SDError SDinvXform(RREAL iMtx[3][3], RREAL vMtx[3][3]);
230
231			/* Transform and normalize direction (column) vector */
232			extern SDError SDmapDir(FVECT resVec, RREAL vMtx[3][3],
233			const FVECT inpVec);
234
235	greg	2.13	/* Application-specific BSDF loading routine (not part of our library) */
236	greg	2.5	extern SDData loadBSDF(char name);
237
238	greg	2.13	/* Application-specific BSDF error translator (not part of our library) */
239	greg	2.5	extern char *transSDError(SDError ec);
240
241	greg	2.4	/################################################################/
242			/######### DEPRECATED DEFINITIONS AWAITING PERMANENT REMOVAL #######/
243	greg	2.1	/*
244			* Header for BSDF i/o and access routines
245			*/
246	greg	2.2
247	greg	2.4	#include "mat4.h"
248	greg	2.1	/* up directions */
249			typedef enum {
250			UDzneg=-3,
251			UDyneg=-2,
252			UDxneg=-1,
253			UDunknown=0,
254			UDxpos=1,
255			UDypos=2,
256			UDzpos=3
257			} UpDir;
258			/* BSDF coordinate calculation routines */
259			/* vectors always point away from surface */
260	greg	2.4
261			typedef int b_vecf2(FVECT v, int n, void *cd);
262			typedef int b_ndxf2(FVECT v, void *cd);
263			typedef double b_radf2(int n, void *cd);
264	greg	2.1
265			/* Bidirectional Scattering Distribution Function */
266			struct BSDF_data {
267			int ninc; /* number of incoming directions */
268			int nout; /* number of outgoing directions */
269	greg	2.3	float dim[3]; /* width, height, thickness (meters) */
270			char mgf; / geometric description (if any) */
271	greg	2.1	void ib_priv; / input basis private data */
272	greg	2.4	b_vecf2 ib_vec; / get input vector from index */
273			b_ndxf2 ib_ndx; / get input index from vector */
274			b_radf2 ib_ohm; / get input radius for index */
275	greg	2.1	void ob_priv; / output basis private data */
276	greg	2.4	b_vecf2 ob_vec; / get output vector from index */
277			b_ndxf2 ob_ndx; / get output index from vector */
278			b_radf2 ob_ohm; / get output radius for index */
279	greg	2.1	float bsdf; / scattering distribution data */
280			}; /* bidirectional scattering distrib. func. */
281
282			#define getBSDF_incvec(v,b,i) (*(b)->ib_vec)(v,i,(b)->ib_priv)
283			#define getBSDF_incndx(b,v) (*(b)->ib_ndx)(v,(b)->ib_priv)
284			#define getBSDF_incohm(b,i) (*(b)->ib_ohm)(i,(b)->ib_priv)
285			#define getBSDF_outvec(v,b,o) (*(b)->ob_vec)(v,o,(b)->ob_priv)
286			#define getBSDF_outndx(b,v) (*(b)->ob_ndx)(v,(b)->ob_priv)
287			#define getBSDF_outohm(b,o) (*(b)->ob_ohm)(o,(b)->ob_priv)
288			#define BSDF_value(b,i,o) (b)->bsdf[(o)*(b)->ninc + (i)]
289
290			extern struct BSDF_data load_BSDF(char fname);
291			extern void free_BSDF(struct BSDF_data *b);
292			extern int r_BSDF_incvec(FVECT v, struct BSDF_data *b, int i,
293			double rv, MAT4 xm);
294			extern int r_BSDF_outvec(FVECT v, struct BSDF_data *b, int o,
295			double rv, MAT4 xm);
296	greg	2.3	extern int getBSDF_xfm(MAT4 xm, FVECT nrm, UpDir ud, char *xfbuf);
297	greg	2.2
298	greg	2.4	/######### END DEPRECATED DEFINITIONS #######/
299			/################################################################/
300
301			#ifdef __cplusplus
302			}
303			#endif
304			#endif /* ! _BSDF_H_ */