| 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 |
< |
* BSDF vectors always oriented away from surface, even when "incident." |
| 12 |
> |
* 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 |
+ |
* BSDF incident & exiting vectors are always oriented away from surface. |
| 18 |
+ |
* |
| 19 |
|
* Created by Greg Ward on 1/10/11. |
| 20 |
|
* |
| 21 |
|
*/ |
| 30 |
|
extern "C" { |
| 31 |
|
#endif |
| 32 |
|
|
| 33 |
+ |
#ifdef _WIN32 |
| 34 |
+ |
#define strcasecmp stricmp |
| 35 |
+ |
#endif |
| 36 |
+ |
|
| 37 |
|
#define SDnameLn 128 /* maximum BSDF name length */ |
| 38 |
|
#define SDmaxCh 3 /* maximum # spectral channels */ |
| 39 |
|
|
| 40 |
< |
/* Component flags for SDsampBSDF() and SDhemiScatter() */ |
| 40 |
> |
/* Component flags for SDsampBSDF() and SDdirectHemi() */ |
| 41 |
|
#define SDsampR 0x1 /* include reflection */ |
| 42 |
|
#define SDsampT 0x2 /* include transmission */ |
| 43 |
|
#define SDsampS 0x3 /* include scattering (R+T) */ |
| 48 |
|
#define SDsampSpS 0x7 /* include non-diffuse scattering */ |
| 49 |
|
#define SDsampAll 0xF /* include everything */ |
| 50 |
|
|
| 51 |
< |
/* Projected solid angle query flags fos SDsizeBSDF() */ |
| 52 |
< |
#define SDqueryInc 0x1 /* query incoming vector */ |
| 53 |
< |
#define SDqueryOut 0x2 /* query outgoing vector */ |
| 54 |
< |
#define SDqueryMin 0x4 /* query minimum proj. solid angle */ |
| 46 |
< |
#define SDqueryMax 0x8 /* query maximum proj. solid angle */ |
| 51 |
> |
/* Projected solid angle query flags for SDsizeBSDF() */ |
| 52 |
> |
#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 |
|
|
| 56 |
|
/* Error codes: normal return, out of memory, file i/o, file format, bad argument, |
| 57 |
|
bad data, unsupported feature, internal error, unknown error */ |
| 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 |
| 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 |
|
} SDCDst; |
| 80 |
|
|
| 81 |
+ |
extern const SDCDst SDemptyCD; /* empty distribution */ |
| 82 |
+ |
|
| 83 |
|
/* Forward declaration of BSDF component */ |
| 84 |
|
typedef struct SDComp_s SDComponent; |
| 85 |
|
|
| 87 |
|
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 |
|
|
| 170 |
< |
/* Initialize an unused BSDF struct (clears to zeroes) */ |
| 171 |
< |
extern void SDclearBSDF(SDData *sd); |
| 170 |
> |
/* Initialize an unused BSDF struct and assign name (calls SDclipName) */ |
| 171 |
> |
extern void SDclearBSDF(SDData *sd, const char *fname); |
| 172 |
|
|
| 173 |
|
/* Load a BSDF struct from the given file (keeps name unchanged) */ |
| 174 |
|
extern SDError SDloadFile(SDData *sd, const char *fname); |
| 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, |
| 171 |
< |
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, |
| 208 |
< |
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 |
|
/*################################################################*/ |
