| 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 |
|
*/ |
| 33 |
|
#define SDnameLn 128 /* maximum BSDF name length */ |
| 34 |
|
#define SDmaxCh 3 /* maximum # spectral channels */ |
| 35 |
|
|
| 36 |
< |
/* Component flags for SDsampBSDF() and SDhemiScatter() */ |
| 36 |
> |
/* Component flags for SDsampBSDF() and SDdirectHemi() */ |
| 37 |
|
#define SDsampR 0x1 /* include reflection */ |
| 38 |
|
#define SDsampT 0x2 /* include transmission */ |
| 39 |
|
#define SDsampS 0x3 /* include scattering (R+T) */ |
| 44 |
|
#define SDsampSpS 0x7 /* include non-diffuse scattering */ |
| 45 |
|
#define SDsampAll 0xF /* include everything */ |
| 46 |
|
|
| 47 |
< |
/* Projected solid angle query flags fos SDsizeBSDF() */ |
| 48 |
< |
#define SDqueryInc 0x1 /* query incoming vector */ |
| 49 |
< |
#define SDqueryOut 0x2 /* query outgoing vector */ |
| 50 |
< |
#define SDqueryMin 0x4 /* query minimum proj. solid angle */ |
| 46 |
< |
#define SDqueryMax 0x8 /* query maximum proj. solid angle */ |
| 47 |
> |
/* Projected solid angle query flags for SDsizeBSDF() */ |
| 48 |
> |
#define SDqueryVal 0x0 /* query single value */ |
| 49 |
> |
#define SDqueryMin 0x1 /* query minimum proj. solid angle */ |
| 50 |
> |
#define SDqueryMax 0x2 /* query maximum proj. solid angle */ |
| 51 |
|
|
| 52 |
|
/* Error codes: normal return, out of memory, file i/o, file format, bad argument, |
| 53 |
|
bad data, unsupported feature, internal error, unknown error */ |
| 81 |
|
typedef const struct { |
| 82 |
|
/* return non-diffuse BSDF */ |
| 83 |
|
int (*getBSDFs)(float coef[SDmaxCh], const FVECT outVec, |
| 84 |
< |
const FVECT inVec, const void *dist); |
| 84 |
> |
const FVECT inVec, SDComponent *sdc); |
| 85 |
|
/* query non-diffuse PSA for vector */ |
| 86 |
< |
SDError (*queryProjSA)(double *psa, const FVECT vec, |
| 87 |
< |
int qflags, const void *dist); |
| 86 |
> |
SDError (*queryProjSA)(double *psa, const FVECT v1, |
| 87 |
> |
const RREAL *v2, int qflags, |
| 88 |
> |
SDComponent *sdc); |
| 89 |
|
/* get cumulative distribution */ |
| 90 |
|
const SDCDst *(*getCDist)(const FVECT inVec, SDComponent *sdc); |
| 91 |
|
/* sample cumulative distribution */ |
| 92 |
< |
SDError (*sampCDist)(FVECT outVec, double randX, |
| 92 |
> |
SDError (*sampCDist)(FVECT ioVec, double randX, |
| 93 |
|
const SDCDst *cdp); |
| 94 |
|
/* free a spectral BSDF component */ |
| 95 |
|
void (*freeSC)(void *dist); |
| 113 |
|
|
| 114 |
|
/* Loaded BSDF data */ |
| 115 |
|
typedef struct { |
| 116 |
< |
char name[SDnameLn]; /* BSDF name (derived from file) */ |
| 116 |
> |
char name[SDnameLn]; /* BSDF name (usu. derived from file) */ |
| 117 |
|
char *mgf; /* geometric description (if any) */ |
| 118 |
|
float dim[3]; /* width, height, thickness (meters) */ |
| 119 |
|
SDValue rLambFront; /* diffuse front reflectance */ |
| 130 |
|
*next; |
| 131 |
|
} *SDcacheList; /* Global BSDF cache */ |
| 132 |
|
|
| 133 |
< |
/* BSDF cache retention preference */ |
| 134 |
< |
#define SDretainNone 0 /* free unreferenced data (default) */ |
| 135 |
< |
#define SDretainBSDFs 1 /* keep loaded BSDFs in cache */ |
| 133 |
> |
/* BSDF cache retention policies */ |
| 134 |
> |
#define SDretainNone 0 /* free unreferenced BSDF data */ |
| 135 |
> |
#define SDretainBSDFs 1 /* keep loaded BSDFs in memory */ |
| 136 |
|
#define SDretainAll 2 /* also keep cumulative cache data */ |
| 137 |
|
|
| 138 |
< |
extern int SDretainSet; /* set to SDretainNone by default */ |
| 138 |
> |
extern int SDretainSet; /* =SDretainNone by default */ |
| 139 |
|
|
| 140 |
|
/***************************************************************** |
| 141 |
|
* The following routines are less commonly used by applications. |
| 142 |
|
*/ |
| 143 |
|
|
| 144 |
< |
#define SDisLoaded(sd) ((sd)->rLambFront.spec.clock != 0) |
| 144 |
> |
#define SDisLoaded(sd) ((sd)->rLambFront.spec.flags != 0) |
| 145 |
|
|
| 146 |
|
/* Report an error to the indicated stream (in English) */ |
| 147 |
|
extern SDError SDreportEnglish(SDError ec, FILE *fp); |
| 155 |
|
/* Free a spectral distribution function */ |
| 156 |
|
extern void SDfreeSpectralDF(SDSpectralDF *df); |
| 157 |
|
|
| 158 |
< |
/* Initialize an unused BSDF struct (clears to zeroes) */ |
| 159 |
< |
extern void SDclearBSDF(SDData *sd); |
| 158 |
> |
/* Initialize an unused BSDF struct and assign name (calls SDclipName) */ |
| 159 |
> |
extern void SDclearBSDF(SDData *sd, const char *fname); |
| 160 |
|
|
| 161 |
|
/* Load a BSDF struct from the given file (keeps name unchanged) */ |
| 162 |
|
extern SDError SDloadFile(SDData *sd, const char *fname); |
| 171 |
|
extern void SDfreeCumulativeCache(SDSpectralDF *df); |
| 172 |
|
|
| 173 |
|
/* Sample an individual BSDF component */ |
| 174 |
< |
extern SDError SDsampComponent(SDValue *sv, FVECT outVec, |
| 175 |
< |
const FVECT inVec, double randX, |
| 171 |
< |
SDComponent *sdc); |
| 174 |
> |
extern SDError SDsampComponent(SDValue *sv, FVECT ioVec, |
| 175 |
> |
double randX, SDComponent *sdc); |
| 176 |
|
|
| 177 |
|
/* Convert 1-dimensional random variable to N-dimensional */ |
| 178 |
|
extern void SDmultiSamp(double t[], int n, double randX); |
| 189 |
|
*/ |
| 190 |
|
|
| 191 |
|
/* Get BSDF from cache (or load and cache it on first call) */ |
| 192 |
< |
/* Report any problems to stderr and return NULL on failure */ |
| 192 |
> |
/* Report any problems to stderr (in English), return NULL on failure */ |
| 193 |
|
extern const SDData *SDcacheFile(const char *fname); |
| 194 |
|
|
| 195 |
< |
/* Free a BSDF from our cache (clear all if NULL) */ |
| 195 |
> |
/* Free a BSDF from our cache (clear all if sd==NULL) */ |
| 196 |
|
extern void SDfreeCache(const SDData *sd); |
| 197 |
|
|
| 198 |
< |
/* Query projected solid angle resolution for non-diffuse BSDF direction */ |
| 199 |
< |
extern SDError SDsizeBSDF(double *projSA, const FVECT vec, |
| 200 |
< |
int qflags, const SDData *sd); |
| 198 |
> |
/* Query projected solid angle resolution for non-diffuse BSDF direction(s) */ |
| 199 |
> |
extern SDError SDsizeBSDF(double *projSA, const FVECT v1, |
| 200 |
> |
const RREAL *v2, int qflags, |
| 201 |
> |
const SDData *sd); |
| 202 |
|
|
| 203 |
|
/* Return BSDF for the given incident and scattered ray vectors */ |
| 204 |
|
extern SDError SDevalBSDF(SDValue *sv, const FVECT outVec, |
| 209 |
|
int sflags, const SDData *sd); |
| 210 |
|
|
| 211 |
|
/* Sample BSDF direction based on the given random variable */ |
| 212 |
< |
extern SDError SDsampBSDF(SDValue *sv, FVECT outVec, |
| 208 |
< |
const FVECT inVec, double randX, |
| 212 |
> |
extern SDError SDsampBSDF(SDValue *sv, FVECT ioVec, double randX, |
| 213 |
|
int sflags, const SDData *sd); |
| 214 |
|
|
| 215 |
|
/***************************************************************** |
| 217 |
|
* Directions may be passed unnormalized to these routines. |
| 218 |
|
*/ |
| 219 |
|
|
| 220 |
< |
/* Compute World->BSDF transform from surface normal and up (Y) vector */ |
| 220 |
> |
/* Compute World->BSDF transform from surface normal and BSDF up vector */ |
| 221 |
|
extern SDError SDcompXform(RREAL vMtx[3][3], const FVECT sNrm, |
| 222 |
|
const FVECT uVec); |
| 223 |
|
|
| 228 |
|
extern SDError SDmapDir(FVECT resVec, RREAL vMtx[3][3], |
| 229 |
|
const FVECT inpVec); |
| 230 |
|
|
| 231 |
< |
/* System-specific BSDF loading routine (not part of our library) */ |
| 231 |
> |
/* Application-specific BSDF loading routine (not part of our library) */ |
| 232 |
|
extern SDData *loadBSDF(char *name); |
| 233 |
|
|
| 234 |
< |
/* System-specific BSDF error translator (not part of our library) */ |
| 234 |
> |
/* Application-specific BSDF error translator (not part of our library) */ |
| 235 |
|
extern char *transSDError(SDError ec); |
| 236 |
|
|
| 237 |
|
/*################################################################*/ |
