14 |
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* in the +Z direction, towards the interior of the space rather |
15 |
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* than the exterior. |
16 |
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* |
17 |
< |
* BSDF vectors always oriented away from surface, even when "incident." |
17 |
> |
* BSDF incident & exiting vectors are always oriented away from surface. |
18 |
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* |
19 |
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* Created by Greg Ward on 1/10/11. |
20 |
|
* |
30 |
|
extern "C" { |
31 |
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#endif |
32 |
|
|
33 |
+ |
#ifdef _WIN32 |
34 |
+ |
#define strcasecmp stricmp |
35 |
+ |
#endif |
36 |
+ |
|
37 |
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#define SDnameLn 128 /* maximum BSDF name length */ |
38 |
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#define SDmaxCh 3 /* maximum # spectral channels */ |
39 |
|
|
71 |
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} SDValue; |
72 |
|
|
73 |
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/* Cached, encoded, cumulative distribution for one incident (solid) angle */ |
74 |
< |
#define SD_CDIST_BASE double cTotal; \ |
75 |
< |
struct SDCDst_s *next |
74 |
> |
#define SD_CDIST_BASE(styp) double cTotal; \ |
75 |
> |
struct styp *next |
76 |
|
typedef struct SDCDst_s { |
77 |
< |
SD_CDIST_BASE; /* base fields first */ |
77 |
> |
SD_CDIST_BASE(SDCDst_s); /* base fields first */ |
78 |
|
/* ...encoded distribution extends struct */ |
79 |
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} SDCDst; |
80 |
|
|
81 |
+ |
extern const SDCDst SDemptyCD; /* empty distribution */ |
82 |
+ |
|
83 |
|
/* Forward declaration of BSDF component */ |
84 |
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typedef struct SDComp_s SDComponent; |
85 |
|
|
87 |
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typedef const struct { |
88 |
|
/* return non-diffuse BSDF */ |
89 |
|
int (*getBSDFs)(float coef[SDmaxCh], const FVECT outVec, |
90 |
< |
const FVECT inVec, const void *dist); |
90 |
> |
const FVECT inVec, SDComponent *sdc); |
91 |
|
/* query non-diffuse PSA for vector */ |
92 |
< |
SDError (*queryProjSA)(double *psa, const FVECT vec, |
93 |
< |
int qflags, const void *dist); |
92 |
> |
SDError (*queryProjSA)(double *psa, const FVECT v1, |
93 |
> |
const RREAL *v2, int qflags, |
94 |
> |
SDComponent *sdc); |
95 |
|
/* get cumulative distribution */ |
96 |
|
const SDCDst *(*getCDist)(const FVECT inVec, SDComponent *sdc); |
97 |
|
/* sample cumulative distribution */ |
98 |
< |
SDError (*sampCDist)(FVECT outVec, double randX, |
98 |
> |
SDError (*sampCDist)(FVECT ioVec, double randX, |
99 |
|
const SDCDst *cdp); |
100 |
|
/* free a spectral BSDF component */ |
101 |
|
void (*freeSC)(void *dist); |
119 |
|
|
120 |
|
/* Loaded BSDF data */ |
121 |
|
typedef struct { |
122 |
< |
char name[SDnameLn]; /* BSDF name (derived from file) */ |
122 |
> |
char name[SDnameLn]; /* BSDF name (usu. derived from file) */ |
123 |
> |
char matn[SDnameLn]; /* material name */ |
124 |
> |
char makr[SDnameLn]; /* manufacturer */ |
125 |
|
char *mgf; /* geometric description (if any) */ |
126 |
|
float dim[3]; /* width, height, thickness (meters) */ |
127 |
|
SDValue rLambFront; /* diffuse front reflectance */ |
128 |
|
SDValue rLambBack; /* diffuse rear reflectance */ |
129 |
|
SDValue tLamb; /* diffuse transmission */ |
130 |
< |
SDSpectralDF *rf, *rb, *tf; /* non-diffuse BSDF components */ |
130 |
> |
SDSpectralDF *rf, *rb; /* non-diffuse BRDF components */ |
131 |
> |
SDSpectralDF *tf, *tb; /* non-diffuse BTDF components */ |
132 |
|
} SDData; |
133 |
|
|
134 |
|
/* List of loaded BSDFs */ |
139 |
|
*next; |
140 |
|
} *SDcacheList; /* Global BSDF cache */ |
141 |
|
|
142 |
< |
/* BSDF cache retention preference */ |
143 |
< |
#define SDretainNone 0 /* free unreferenced data (default) */ |
144 |
< |
#define SDretainBSDFs 1 /* keep loaded BSDFs in cache */ |
142 |
> |
/* BSDF cache retention policies */ |
143 |
> |
#define SDretainNone 0 /* free unreferenced BSDF data */ |
144 |
> |
#define SDretainBSDFs 1 /* keep loaded BSDFs in memory */ |
145 |
|
#define SDretainAll 2 /* also keep cumulative cache data */ |
146 |
|
|
147 |
< |
extern int SDretainSet; /* set to SDretainNone by default */ |
147 |
> |
extern int SDretainSet; /* =SDretainNone by default */ |
148 |
|
|
149 |
|
/***************************************************************** |
150 |
|
* The following routines are less commonly used by applications. |
161 |
|
/* Allocate new spectral distribution function */ |
162 |
|
extern SDSpectralDF *SDnewSpectralDF(int nc); |
163 |
|
|
164 |
+ |
/* Add component(s) to spectral distribution function */ |
165 |
+ |
extern SDSpectralDF *SDaddComponent(SDSpectralDF *odf, int nadd); |
166 |
+ |
|
167 |
|
/* Free a spectral distribution function */ |
168 |
|
extern void SDfreeSpectralDF(SDSpectralDF *df); |
169 |
|
|
183 |
|
extern void SDfreeCumulativeCache(SDSpectralDF *df); |
184 |
|
|
185 |
|
/* Sample an individual BSDF component */ |
186 |
< |
extern SDError SDsampComponent(SDValue *sv, FVECT outVec, |
187 |
< |
const FVECT inVec, double randX, |
175 |
< |
SDComponent *sdc); |
186 |
> |
extern SDError SDsampComponent(SDValue *sv, FVECT ioVec, |
187 |
> |
double randX, SDComponent *sdc); |
188 |
|
|
189 |
|
/* Convert 1-dimensional random variable to N-dimensional */ |
190 |
|
extern void SDmultiSamp(double t[], int n, double randX); |
201 |
|
*/ |
202 |
|
|
203 |
|
/* Get BSDF from cache (or load and cache it on first call) */ |
204 |
< |
/* Report any problems to stderr and return NULL on failure */ |
204 |
> |
/* Report any problems to stderr (in English), return NULL on failure */ |
205 |
|
extern const SDData *SDcacheFile(const char *fname); |
206 |
|
|
207 |
< |
/* Free a BSDF from our cache (clear all if NULL) */ |
207 |
> |
/* Free a BSDF from our cache (clear all if sd==NULL) */ |
208 |
|
extern void SDfreeCache(const SDData *sd); |
209 |
|
|
210 |
< |
/* Query projected solid angle resolution for non-diffuse BSDF direction */ |
211 |
< |
extern SDError SDsizeBSDF(double *projSA, const FVECT vec, |
212 |
< |
int qflags, const SDData *sd); |
210 |
> |
/* Query projected solid angle resolution for non-diffuse BSDF direction(s) */ |
211 |
> |
extern SDError SDsizeBSDF(double *projSA, const FVECT v1, |
212 |
> |
const RREAL *v2, int qflags, |
213 |
> |
const SDData *sd); |
214 |
|
|
215 |
|
/* Return BSDF for the given incident and scattered ray vectors */ |
216 |
|
extern SDError SDevalBSDF(SDValue *sv, const FVECT outVec, |
221 |
|
int sflags, const SDData *sd); |
222 |
|
|
223 |
|
/* Sample BSDF direction based on the given random variable */ |
224 |
< |
extern SDError SDsampBSDF(SDValue *sv, FVECT outVec, |
212 |
< |
const FVECT inVec, double randX, |
224 |
> |
extern SDError SDsampBSDF(SDValue *sv, FVECT ioVec, double randX, |
225 |
|
int sflags, const SDData *sd); |
226 |
|
|
227 |
|
/***************************************************************** |
229 |
|
* Directions may be passed unnormalized to these routines. |
230 |
|
*/ |
231 |
|
|
232 |
< |
/* Compute World->BSDF transform from surface normal and up (Y) vector */ |
232 |
> |
/* Compute World->BSDF transform from surface normal and BSDF up vector */ |
233 |
|
extern SDError SDcompXform(RREAL vMtx[3][3], const FVECT sNrm, |
234 |
|
const FVECT uVec); |
235 |
|
|
240 |
|
extern SDError SDmapDir(FVECT resVec, RREAL vMtx[3][3], |
241 |
|
const FVECT inpVec); |
242 |
|
|
243 |
< |
/* System-specific BSDF loading routine (not part of our library) */ |
243 |
> |
/* Application-specific BSDF loading routine (not part of our library) */ |
244 |
|
extern SDData *loadBSDF(char *name); |
245 |
|
|
246 |
< |
/* System-specific BSDF error translator (not part of our library) */ |
246 |
> |
/* Application-specific BSDF error translator (not part of our library) */ |
247 |
|
extern char *transSDError(SDError ec); |
248 |
|
|
249 |
|
/*################################################################*/ |