2 |
|
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
4 |
|
/* |
5 |
+ |
* bsdf.c |
6 |
+ |
* |
7 |
+ |
* Definitions for bidirectional scattering distribution functions. |
8 |
+ |
* |
9 |
+ |
* Created by Greg Ward on 1/10/11. |
10 |
+ |
* |
11 |
+ |
*/ |
12 |
+ |
|
13 |
+ |
#define _USE_MATH_DEFINES |
14 |
+ |
#include <stdio.h> |
15 |
+ |
#include <stdlib.h> |
16 |
+ |
#include <string.h> |
17 |
+ |
#include <math.h> |
18 |
+ |
#include <ctype.h> |
19 |
+ |
#include "ezxml.h" |
20 |
+ |
#include "hilbert.h" |
21 |
+ |
#include "bsdf.h" |
22 |
+ |
#include "bsdf_m.h" |
23 |
+ |
#include "bsdf_t.h" |
24 |
+ |
|
25 |
+ |
/* English ASCII strings corresponding to ennumerated errors */ |
26 |
+ |
const char *SDerrorEnglish[] = { |
27 |
+ |
"No error", |
28 |
+ |
"Memory error", |
29 |
+ |
"File input/output error", |
30 |
+ |
"File format error", |
31 |
+ |
"Illegal argument", |
32 |
+ |
"Invalid data", |
33 |
+ |
"Unsupported feature", |
34 |
+ |
"Internal program error", |
35 |
+ |
"Unknown error" |
36 |
+ |
}; |
37 |
+ |
|
38 |
+ |
/* Additional information on last error (ASCII English) */ |
39 |
+ |
char SDerrorDetail[256]; |
40 |
+ |
|
41 |
+ |
/* Cache of loaded BSDFs */ |
42 |
+ |
struct SDCache_s *SDcacheList = NULL; |
43 |
+ |
|
44 |
+ |
/* Retain BSDFs in cache list */ |
45 |
+ |
int SDretainSet = SDretainNone; |
46 |
+ |
|
47 |
+ |
/* Report any error to the indicated stream (in English) */ |
48 |
+ |
SDError |
49 |
+ |
SDreportEnglish(SDError ec, FILE *fp) |
50 |
+ |
{ |
51 |
+ |
if (!ec) |
52 |
+ |
return SDEnone; |
53 |
+ |
if ((ec < SDEnone) | (ec > SDEunknown)) { |
54 |
+ |
SDerrorDetail[0] = '\0'; |
55 |
+ |
ec = SDEunknown; |
56 |
+ |
} |
57 |
+ |
if (fp == NULL) |
58 |
+ |
return ec; |
59 |
+ |
fputs(SDerrorEnglish[ec], fp); |
60 |
+ |
if (SDerrorDetail[0]) { |
61 |
+ |
fputs(": ", fp); |
62 |
+ |
fputs(SDerrorDetail, fp); |
63 |
+ |
} |
64 |
+ |
fputc('\n', fp); |
65 |
+ |
if (fp != stderr) |
66 |
+ |
fflush(fp); |
67 |
+ |
return ec; |
68 |
+ |
} |
69 |
+ |
|
70 |
+ |
static double |
71 |
+ |
to_meters( /* return factor to convert given unit to meters */ |
72 |
+ |
const char *unit |
73 |
+ |
) |
74 |
+ |
{ |
75 |
+ |
if (unit == NULL) return(1.); /* safe assumption? */ |
76 |
+ |
if (!strcasecmp(unit, "Meter")) return(1.); |
77 |
+ |
if (!strcasecmp(unit, "Foot")) return(.3048); |
78 |
+ |
if (!strcasecmp(unit, "Inch")) return(.0254); |
79 |
+ |
if (!strcasecmp(unit, "Centimeter")) return(.01); |
80 |
+ |
if (!strcasecmp(unit, "Millimeter")) return(.001); |
81 |
+ |
sprintf(SDerrorDetail, "Unknown dimensional unit '%s'", unit); |
82 |
+ |
return(-1.); |
83 |
+ |
} |
84 |
+ |
|
85 |
+ |
/* Load geometric dimensions and description (if any) */ |
86 |
+ |
static SDError |
87 |
+ |
SDloadGeometry(SDData *sd, ezxml_t wdb) |
88 |
+ |
{ |
89 |
+ |
ezxml_t geom; |
90 |
+ |
double cfact; |
91 |
+ |
const char *fmt, *mgfstr; |
92 |
+ |
|
93 |
+ |
if (wdb == NULL) /* no geometry section? */ |
94 |
+ |
return SDEnone; |
95 |
+ |
sd->dim[0] = sd->dim[1] = sd->dim[2] = .0; |
96 |
+ |
if ((geom = ezxml_child(wdb, "Width")) != NULL) |
97 |
+ |
sd->dim[0] = atof(ezxml_txt(geom)) * |
98 |
+ |
to_meters(ezxml_attr(geom, "unit")); |
99 |
+ |
if ((geom = ezxml_child(wdb, "Height")) != NULL) |
100 |
+ |
sd->dim[1] = atof(ezxml_txt(geom)) * |
101 |
+ |
to_meters(ezxml_attr(geom, "unit")); |
102 |
+ |
if ((geom = ezxml_child(wdb, "Thickness")) != NULL) |
103 |
+ |
sd->dim[2] = atof(ezxml_txt(geom)) * |
104 |
+ |
to_meters(ezxml_attr(geom, "unit")); |
105 |
+ |
if ((sd->dim[0] < 0) | (sd->dim[1] < 0) | (sd->dim[2] < 0)) { |
106 |
+ |
sprintf(SDerrorDetail, "Negative size in \"%s\"", sd->name); |
107 |
+ |
return SDEdata; |
108 |
+ |
} |
109 |
+ |
if ((geom = ezxml_child(wdb, "Geometry")) == NULL || |
110 |
+ |
(mgfstr = ezxml_txt(geom)) == NULL) |
111 |
+ |
return SDEnone; |
112 |
+ |
while (isspace(*mgfstr)) |
113 |
+ |
++mgfstr; |
114 |
+ |
if (!*mgfstr) |
115 |
+ |
return SDEnone; |
116 |
+ |
if ((fmt = ezxml_attr(geom, "format")) != NULL && |
117 |
+ |
strcasecmp(fmt, "MGF")) { |
118 |
+ |
sprintf(SDerrorDetail, |
119 |
+ |
"Unrecognized geometry format '%s' in \"%s\"", |
120 |
+ |
fmt, sd->name); |
121 |
+ |
return SDEsupport; |
122 |
+ |
} |
123 |
+ |
cfact = to_meters(ezxml_attr(geom, "unit")); |
124 |
+ |
sd->mgf = (char *)malloc(strlen(mgfstr)+32); |
125 |
+ |
if (sd->mgf == NULL) { |
126 |
+ |
strcpy(SDerrorDetail, "Out of memory in SDloadGeometry"); |
127 |
+ |
return SDEmemory; |
128 |
+ |
} |
129 |
+ |
if (cfact < 0.99 || cfact > 1.01) |
130 |
+ |
sprintf(sd->mgf, "xf -s %.5f\n%s\nxf\n", cfact, mgfstr); |
131 |
+ |
else |
132 |
+ |
strcpy(sd->mgf, mgfstr); |
133 |
+ |
return SDEnone; |
134 |
+ |
} |
135 |
+ |
|
136 |
+ |
/* Load a BSDF struct from the given file (free first and keep name) */ |
137 |
+ |
SDError |
138 |
+ |
SDloadFile(SDData *sd, const char *fname) |
139 |
+ |
{ |
140 |
+ |
SDError lastErr; |
141 |
+ |
ezxml_t fl, wtl; |
142 |
+ |
|
143 |
+ |
if ((sd == NULL) | (fname == NULL || !*fname)) |
144 |
+ |
return SDEargument; |
145 |
+ |
/* free old data, keeping name */ |
146 |
+ |
SDfreeBSDF(sd); |
147 |
+ |
/* parse XML file */ |
148 |
+ |
fl = ezxml_parse_file(fname); |
149 |
+ |
if (fl == NULL) { |
150 |
+ |
sprintf(SDerrorDetail, "Cannot open BSDF \"%s\"", fname); |
151 |
+ |
return SDEfile; |
152 |
+ |
} |
153 |
+ |
if (ezxml_error(fl)[0]) { |
154 |
+ |
sprintf(SDerrorDetail, "BSDF \"%s\" %s", fname, ezxml_error(fl)); |
155 |
+ |
ezxml_free(fl); |
156 |
+ |
return SDEformat; |
157 |
+ |
} |
158 |
+ |
if (strcmp(ezxml_name(fl), "WindowElement")) { |
159 |
+ |
sprintf(SDerrorDetail, |
160 |
+ |
"BSDF \"%s\": top level node not 'WindowElement'", |
161 |
+ |
sd->name); |
162 |
+ |
ezxml_free(fl); |
163 |
+ |
return SDEformat; |
164 |
+ |
} |
165 |
+ |
wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer"); |
166 |
+ |
if (wtl == NULL) { |
167 |
+ |
sprintf(SDerrorDetail, "BSDF \"%s\": no optical layer'", |
168 |
+ |
sd->name); |
169 |
+ |
ezxml_free(fl); |
170 |
+ |
return SDEformat; |
171 |
+ |
} |
172 |
+ |
/* load geometry if present */ |
173 |
+ |
lastErr = SDloadGeometry(sd, ezxml_child(wtl, "Material")); |
174 |
+ |
if (lastErr) { |
175 |
+ |
ezxml_free(fl); |
176 |
+ |
return lastErr; |
177 |
+ |
} |
178 |
+ |
/* try loading variable resolution data */ |
179 |
+ |
lastErr = SDloadTre(sd, wtl); |
180 |
+ |
/* check our result */ |
181 |
+ |
if (lastErr == SDEsupport) /* try matrix BSDF if not tree data */ |
182 |
+ |
lastErr = SDloadMtx(sd, wtl); |
183 |
+ |
|
184 |
+ |
/* done with XML file */ |
185 |
+ |
ezxml_free(fl); |
186 |
+ |
|
187 |
+ |
if (lastErr) { /* was there a load error? */ |
188 |
+ |
SDfreeBSDF(sd); |
189 |
+ |
return lastErr; |
190 |
+ |
} |
191 |
+ |
/* remove any insignificant components */ |
192 |
+ |
if (sd->rf != NULL && sd->rf->maxHemi <= .001) { |
193 |
+ |
SDfreeSpectralDF(sd->rf); sd->rf = NULL; |
194 |
+ |
} |
195 |
+ |
if (sd->rb != NULL && sd->rb->maxHemi <= .001) { |
196 |
+ |
SDfreeSpectralDF(sd->rb); sd->rb = NULL; |
197 |
+ |
} |
198 |
+ |
if (sd->tf != NULL && sd->tf->maxHemi <= .001) { |
199 |
+ |
SDfreeSpectralDF(sd->tf); sd->tf = NULL; |
200 |
+ |
} |
201 |
+ |
/* return success */ |
202 |
+ |
return SDEnone; |
203 |
+ |
} |
204 |
+ |
|
205 |
+ |
/* Allocate new spectral distribution function */ |
206 |
+ |
SDSpectralDF * |
207 |
+ |
SDnewSpectralDF(int nc) |
208 |
+ |
{ |
209 |
+ |
SDSpectralDF *df; |
210 |
+ |
|
211 |
+ |
if (nc <= 0) { |
212 |
+ |
strcpy(SDerrorDetail, "Zero component spectral DF request"); |
213 |
+ |
return NULL; |
214 |
+ |
} |
215 |
+ |
df = (SDSpectralDF *)malloc(sizeof(SDSpectralDF) + |
216 |
+ |
(nc-1)*sizeof(SDComponent)); |
217 |
+ |
if (df == NULL) { |
218 |
+ |
sprintf(SDerrorDetail, |
219 |
+ |
"Cannot allocate %d component spectral DF", nc); |
220 |
+ |
return NULL; |
221 |
+ |
} |
222 |
+ |
df->minProjSA = .0; |
223 |
+ |
df->maxHemi = .0; |
224 |
+ |
df->ncomp = nc; |
225 |
+ |
memset(df->comp, 0, nc*sizeof(SDComponent)); |
226 |
+ |
return df; |
227 |
+ |
} |
228 |
+ |
|
229 |
+ |
/* Add component(s) to spectral distribution function */ |
230 |
+ |
SDSpectralDF * |
231 |
+ |
SDaddComponent(SDSpectralDF *odf, int nadd) |
232 |
+ |
{ |
233 |
+ |
SDSpectralDF *df; |
234 |
+ |
|
235 |
+ |
if (odf == NULL) |
236 |
+ |
return SDnewSpectralDF(nadd); |
237 |
+ |
if (nadd <= 0) |
238 |
+ |
return odf; |
239 |
+ |
df = (SDSpectralDF *)realloc(odf, sizeof(SDSpectralDF) + |
240 |
+ |
(odf->ncomp+nadd-1)*sizeof(SDComponent)); |
241 |
+ |
if (df == NULL) { |
242 |
+ |
sprintf(SDerrorDetail, |
243 |
+ |
"Cannot add %d component(s) to spectral DF", nadd); |
244 |
+ |
SDfreeSpectralDF(odf); |
245 |
+ |
return NULL; |
246 |
+ |
} |
247 |
+ |
memset(df->comp+df->ncomp, 0, nadd*sizeof(SDComponent)); |
248 |
+ |
df->ncomp += nadd; |
249 |
+ |
return df; |
250 |
+ |
} |
251 |
+ |
|
252 |
+ |
/* Free cached cumulative distributions for BSDF component */ |
253 |
+ |
void |
254 |
+ |
SDfreeCumulativeCache(SDSpectralDF *df) |
255 |
+ |
{ |
256 |
+ |
int n; |
257 |
+ |
SDCDst *cdp; |
258 |
+ |
|
259 |
+ |
if (df == NULL) |
260 |
+ |
return; |
261 |
+ |
for (n = df->ncomp; n-- > 0; ) |
262 |
+ |
while ((cdp = df->comp[n].cdList) != NULL) { |
263 |
+ |
df->comp[n].cdList = cdp->next; |
264 |
+ |
free(cdp); |
265 |
+ |
} |
266 |
+ |
} |
267 |
+ |
|
268 |
+ |
/* Free a spectral distribution function */ |
269 |
+ |
void |
270 |
+ |
SDfreeSpectralDF(SDSpectralDF *df) |
271 |
+ |
{ |
272 |
+ |
int n; |
273 |
+ |
|
274 |
+ |
if (df == NULL) |
275 |
+ |
return; |
276 |
+ |
SDfreeCumulativeCache(df); |
277 |
+ |
for (n = df->ncomp; n-- > 0; ) |
278 |
+ |
if (df->comp[n].dist != NULL) |
279 |
+ |
(*df->comp[n].func->freeSC)(df->comp[n].dist); |
280 |
+ |
free(df); |
281 |
+ |
} |
282 |
+ |
|
283 |
+ |
/* Shorten file path to useable BSDF name, removing suffix */ |
284 |
+ |
void |
285 |
+ |
SDclipName(char *res, const char *fname) |
286 |
+ |
{ |
287 |
+ |
const char *cp, *dot = NULL; |
288 |
+ |
|
289 |
+ |
for (cp = fname; *cp; cp++) |
290 |
+ |
if (*cp == '.') |
291 |
+ |
dot = cp; |
292 |
+ |
if ((dot == NULL) | (dot < fname+2)) |
293 |
+ |
dot = cp; |
294 |
+ |
if (dot - fname >= SDnameLn) |
295 |
+ |
fname = dot - SDnameLn + 1; |
296 |
+ |
while (fname < dot) |
297 |
+ |
*res++ = *fname++; |
298 |
+ |
*res = '\0'; |
299 |
+ |
} |
300 |
+ |
|
301 |
+ |
/* Initialize an unused BSDF struct (simply clears to zeroes) */ |
302 |
+ |
void |
303 |
+ |
SDclearBSDF(SDData *sd, const char *fname) |
304 |
+ |
{ |
305 |
+ |
if (sd == NULL) |
306 |
+ |
return; |
307 |
+ |
memset(sd, 0, sizeof(SDData)); |
308 |
+ |
if (fname == NULL) |
309 |
+ |
return; |
310 |
+ |
SDclipName(sd->name, fname); |
311 |
+ |
} |
312 |
+ |
|
313 |
+ |
/* Free data associated with BSDF struct */ |
314 |
+ |
void |
315 |
+ |
SDfreeBSDF(SDData *sd) |
316 |
+ |
{ |
317 |
+ |
if (sd == NULL) |
318 |
+ |
return; |
319 |
+ |
if (sd->mgf != NULL) { |
320 |
+ |
free(sd->mgf); |
321 |
+ |
sd->mgf = NULL; |
322 |
+ |
} |
323 |
+ |
if (sd->rf != NULL) { |
324 |
+ |
SDfreeSpectralDF(sd->rf); |
325 |
+ |
sd->rf = NULL; |
326 |
+ |
} |
327 |
+ |
if (sd->rb != NULL) { |
328 |
+ |
SDfreeSpectralDF(sd->rb); |
329 |
+ |
sd->rb = NULL; |
330 |
+ |
} |
331 |
+ |
if (sd->tf != NULL) { |
332 |
+ |
SDfreeSpectralDF(sd->tf); |
333 |
+ |
sd->tf = NULL; |
334 |
+ |
} |
335 |
+ |
sd->rLambFront.cieY = .0; |
336 |
+ |
sd->rLambFront.spec.flags = 0; |
337 |
+ |
sd->rLambBack.cieY = .0; |
338 |
+ |
sd->rLambBack.spec.flags = 0; |
339 |
+ |
sd->tLamb.cieY = .0; |
340 |
+ |
sd->tLamb.spec.flags = 0; |
341 |
+ |
} |
342 |
+ |
|
343 |
+ |
/* Find writeable BSDF by name, or allocate new cache entry if absent */ |
344 |
+ |
SDData * |
345 |
+ |
SDgetCache(const char *bname) |
346 |
+ |
{ |
347 |
+ |
struct SDCache_s *sdl; |
348 |
+ |
char sdnam[SDnameLn]; |
349 |
+ |
|
350 |
+ |
if (bname == NULL) |
351 |
+ |
return NULL; |
352 |
+ |
|
353 |
+ |
SDclipName(sdnam, bname); |
354 |
+ |
for (sdl = SDcacheList; sdl != NULL; sdl = sdl->next) |
355 |
+ |
if (!strcmp(sdl->bsdf.name, sdnam)) { |
356 |
+ |
sdl->refcnt++; |
357 |
+ |
return &sdl->bsdf; |
358 |
+ |
} |
359 |
+ |
|
360 |
+ |
sdl = (struct SDCache_s *)calloc(1, sizeof(struct SDCache_s)); |
361 |
+ |
if (sdl == NULL) |
362 |
+ |
return NULL; |
363 |
+ |
|
364 |
+ |
strcpy(sdl->bsdf.name, sdnam); |
365 |
+ |
sdl->next = SDcacheList; |
366 |
+ |
SDcacheList = sdl; |
367 |
+ |
|
368 |
+ |
sdl->refcnt = 1; |
369 |
+ |
return &sdl->bsdf; |
370 |
+ |
} |
371 |
+ |
|
372 |
+ |
/* Get loaded BSDF from cache (or load and cache it on first call) */ |
373 |
+ |
/* Report any problem to stderr and return NULL on failure */ |
374 |
+ |
const SDData * |
375 |
+ |
SDcacheFile(const char *fname) |
376 |
+ |
{ |
377 |
+ |
SDData *sd; |
378 |
+ |
SDError ec; |
379 |
+ |
|
380 |
+ |
if (fname == NULL || !*fname) |
381 |
+ |
return NULL; |
382 |
+ |
SDerrorDetail[0] = '\0'; |
383 |
+ |
if ((sd = SDgetCache(fname)) == NULL) { |
384 |
+ |
SDreportEnglish(SDEmemory, stderr); |
385 |
+ |
return NULL; |
386 |
+ |
} |
387 |
+ |
if (!SDisLoaded(sd) && (ec = SDloadFile(sd, fname))) { |
388 |
+ |
SDreportEnglish(ec, stderr); |
389 |
+ |
SDfreeCache(sd); |
390 |
+ |
return NULL; |
391 |
+ |
} |
392 |
+ |
return sd; |
393 |
+ |
} |
394 |
+ |
|
395 |
+ |
/* Free a BSDF from our cache (clear all if NULL) */ |
396 |
+ |
void |
397 |
+ |
SDfreeCache(const SDData *sd) |
398 |
+ |
{ |
399 |
+ |
struct SDCache_s *sdl, *sdLast = NULL; |
400 |
+ |
|
401 |
+ |
if (sd == NULL) { /* free entire list */ |
402 |
+ |
while ((sdl = SDcacheList) != NULL) { |
403 |
+ |
SDcacheList = sdl->next; |
404 |
+ |
SDfreeBSDF(&sdl->bsdf); |
405 |
+ |
free(sdl); |
406 |
+ |
} |
407 |
+ |
return; |
408 |
+ |
} |
409 |
+ |
for (sdl = SDcacheList; sdl != NULL; sdl = (sdLast=sdl)->next) |
410 |
+ |
if (&sdl->bsdf == sd) |
411 |
+ |
break; |
412 |
+ |
if (sdl == NULL || (sdl->refcnt -= (sdl->refcnt > 0))) |
413 |
+ |
return; /* missing or still in use */ |
414 |
+ |
/* keep unreferenced data? */ |
415 |
+ |
if (SDisLoaded(sd) && SDretainSet) { |
416 |
+ |
if (SDretainSet == SDretainAll) |
417 |
+ |
return; /* keep everything */ |
418 |
+ |
/* else free cumulative data */ |
419 |
+ |
SDfreeCumulativeCache(sd->rf); |
420 |
+ |
SDfreeCumulativeCache(sd->rb); |
421 |
+ |
SDfreeCumulativeCache(sd->tf); |
422 |
+ |
return; |
423 |
+ |
} |
424 |
+ |
/* remove from list and free */ |
425 |
+ |
if (sdLast == NULL) |
426 |
+ |
SDcacheList = sdl->next; |
427 |
+ |
else |
428 |
+ |
sdLast->next = sdl->next; |
429 |
+ |
SDfreeBSDF(&sdl->bsdf); |
430 |
+ |
free(sdl); |
431 |
+ |
} |
432 |
+ |
|
433 |
+ |
/* Sample an individual BSDF component */ |
434 |
+ |
SDError |
435 |
+ |
SDsampComponent(SDValue *sv, FVECT ioVec, double randX, SDComponent *sdc) |
436 |
+ |
{ |
437 |
+ |
float coef[SDmaxCh]; |
438 |
+ |
SDError ec; |
439 |
+ |
FVECT inVec; |
440 |
+ |
const SDCDst *cd; |
441 |
+ |
double d; |
442 |
+ |
int n; |
443 |
+ |
/* check arguments */ |
444 |
+ |
if ((sv == NULL) | (ioVec == NULL) | (sdc == NULL)) |
445 |
+ |
return SDEargument; |
446 |
+ |
/* get cumulative distribution */ |
447 |
+ |
VCOPY(inVec, ioVec); |
448 |
+ |
cd = (*sdc->func->getCDist)(inVec, sdc); |
449 |
+ |
if (cd == NULL) |
450 |
+ |
return SDEmemory; |
451 |
+ |
if (cd->cTotal <= 1e-6) { /* anything to sample? */ |
452 |
+ |
sv->spec = c_dfcolor; |
453 |
+ |
sv->cieY = .0; |
454 |
+ |
memset(ioVec, 0, 3*sizeof(double)); |
455 |
+ |
return SDEnone; |
456 |
+ |
} |
457 |
+ |
sv->cieY = cd->cTotal; |
458 |
+ |
/* compute sample direction */ |
459 |
+ |
ec = (*sdc->func->sampCDist)(ioVec, randX, cd); |
460 |
+ |
if (ec) |
461 |
+ |
return ec; |
462 |
+ |
/* get BSDF color */ |
463 |
+ |
n = (*sdc->func->getBSDFs)(coef, ioVec, inVec, sdc); |
464 |
+ |
if (n <= 0) { |
465 |
+ |
strcpy(SDerrorDetail, "BSDF sample value error"); |
466 |
+ |
return SDEinternal; |
467 |
+ |
} |
468 |
+ |
sv->spec = sdc->cspec[0]; |
469 |
+ |
d = coef[0]; |
470 |
+ |
while (--n) { |
471 |
+ |
c_cmix(&sv->spec, d, &sv->spec, coef[n], &sdc->cspec[n]); |
472 |
+ |
d += coef[n]; |
473 |
+ |
} |
474 |
+ |
/* make sure everything is set */ |
475 |
+ |
c_ccvt(&sv->spec, C_CSXY+C_CSSPEC); |
476 |
+ |
return SDEnone; |
477 |
+ |
} |
478 |
+ |
|
479 |
+ |
#define MS_MAXDIM 15 |
480 |
+ |
|
481 |
+ |
/* Convert 1-dimensional random variable to N-dimensional */ |
482 |
+ |
void |
483 |
+ |
SDmultiSamp(double t[], int n, double randX) |
484 |
+ |
{ |
485 |
+ |
unsigned nBits; |
486 |
+ |
double scale; |
487 |
+ |
bitmask_t ndx, coord[MS_MAXDIM]; |
488 |
+ |
|
489 |
+ |
while (n > MS_MAXDIM) /* punt for higher dimensions */ |
490 |
+ |
t[--n] = rand()*(1./(RAND_MAX+.5)); |
491 |
+ |
nBits = (8*sizeof(bitmask_t) - 1) / n; |
492 |
+ |
ndx = randX * (double)((bitmask_t)1 << (nBits*n)); |
493 |
+ |
/* get coordinate on Hilbert curve */ |
494 |
+ |
hilbert_i2c(n, nBits, ndx, coord); |
495 |
+ |
/* convert back to [0,1) range */ |
496 |
+ |
scale = 1. / (double)((bitmask_t)1 << nBits); |
497 |
+ |
while (n--) |
498 |
+ |
t[n] = scale * ((double)coord[n] + rand()*(1./(RAND_MAX+.5))); |
499 |
+ |
} |
500 |
+ |
|
501 |
+ |
#undef MS_MAXDIM |
502 |
+ |
|
503 |
+ |
/* Generate diffuse hemispherical sample */ |
504 |
+ |
static void |
505 |
+ |
SDdiffuseSamp(FVECT outVec, int outFront, double randX) |
506 |
+ |
{ |
507 |
+ |
/* convert to position on hemisphere */ |
508 |
+ |
SDmultiSamp(outVec, 2, randX); |
509 |
+ |
SDsquare2disk(outVec, outVec[0], outVec[1]); |
510 |
+ |
outVec[2] = 1. - outVec[0]*outVec[0] - outVec[1]*outVec[1]; |
511 |
+ |
if (outVec[2] > 0) /* a bit of paranoia */ |
512 |
+ |
outVec[2] = sqrt(outVec[2]); |
513 |
+ |
if (!outFront) /* going out back? */ |
514 |
+ |
outVec[2] = -outVec[2]; |
515 |
+ |
} |
516 |
+ |
|
517 |
+ |
/* Query projected solid angle coverage for non-diffuse BSDF direction */ |
518 |
+ |
SDError |
519 |
+ |
SDsizeBSDF(double *projSA, const FVECT v1, const RREAL *v2, |
520 |
+ |
int qflags, const SDData *sd) |
521 |
+ |
{ |
522 |
+ |
SDSpectralDF *rdf, *tdf; |
523 |
+ |
SDError ec; |
524 |
+ |
int i; |
525 |
+ |
/* check arguments */ |
526 |
+ |
if ((projSA == NULL) | (v1 == NULL) | (sd == NULL)) |
527 |
+ |
return SDEargument; |
528 |
+ |
/* initialize extrema */ |
529 |
+ |
switch (qflags) { |
530 |
+ |
case SDqueryMax: |
531 |
+ |
projSA[0] = .0; |
532 |
+ |
break; |
533 |
+ |
case SDqueryMin+SDqueryMax: |
534 |
+ |
projSA[1] = .0; |
535 |
+ |
/* fall through */ |
536 |
+ |
case SDqueryMin: |
537 |
+ |
projSA[0] = 10.; |
538 |
+ |
break; |
539 |
+ |
case 0: |
540 |
+ |
return SDEargument; |
541 |
+ |
} |
542 |
+ |
if (v1[2] > 0) /* front surface query? */ |
543 |
+ |
rdf = sd->rf; |
544 |
+ |
else |
545 |
+ |
rdf = sd->rb; |
546 |
+ |
tdf = sd->tf; |
547 |
+ |
if (v2 != NULL) /* bidirectional? */ |
548 |
+ |
if (v1[2] > 0 ^ v2[2] > 0) |
549 |
+ |
rdf = NULL; |
550 |
+ |
else |
551 |
+ |
tdf = NULL; |
552 |
+ |
ec = SDEdata; /* run through components */ |
553 |
+ |
for (i = (rdf==NULL) ? 0 : rdf->ncomp; i--; ) { |
554 |
+ |
ec = (*rdf->comp[i].func->queryProjSA)(projSA, v1, v2, |
555 |
+ |
qflags, &rdf->comp[i]); |
556 |
+ |
if (ec) |
557 |
+ |
return ec; |
558 |
+ |
} |
559 |
+ |
for (i = (tdf==NULL) ? 0 : tdf->ncomp; i--; ) { |
560 |
+ |
ec = (*tdf->comp[i].func->queryProjSA)(projSA, v1, v2, |
561 |
+ |
qflags, &tdf->comp[i]); |
562 |
+ |
if (ec) |
563 |
+ |
return ec; |
564 |
+ |
} |
565 |
+ |
if (ec) { /* all diffuse? */ |
566 |
+ |
projSA[0] = M_PI; |
567 |
+ |
if (qflags == SDqueryMin+SDqueryMax) |
568 |
+ |
projSA[1] = M_PI; |
569 |
+ |
} |
570 |
+ |
return SDEnone; |
571 |
+ |
} |
572 |
+ |
|
573 |
+ |
/* Return BSDF for the given incident and scattered ray vectors */ |
574 |
+ |
SDError |
575 |
+ |
SDevalBSDF(SDValue *sv, const FVECT outVec, const FVECT inVec, const SDData *sd) |
576 |
+ |
{ |
577 |
+ |
int inFront, outFront; |
578 |
+ |
SDSpectralDF *sdf; |
579 |
+ |
float coef[SDmaxCh]; |
580 |
+ |
int nch, i; |
581 |
+ |
/* check arguments */ |
582 |
+ |
if ((sv == NULL) | (outVec == NULL) | (inVec == NULL) | (sd == NULL)) |
583 |
+ |
return SDEargument; |
584 |
+ |
/* whose side are we on? */ |
585 |
+ |
inFront = (inVec[2] > 0); |
586 |
+ |
outFront = (outVec[2] > 0); |
587 |
+ |
/* start with diffuse portion */ |
588 |
+ |
if (inFront & outFront) { |
589 |
+ |
*sv = sd->rLambFront; |
590 |
+ |
sdf = sd->rf; |
591 |
+ |
} else if (!(inFront | outFront)) { |
592 |
+ |
*sv = sd->rLambBack; |
593 |
+ |
sdf = sd->rb; |
594 |
+ |
} else /* inFront ^ outFront */ { |
595 |
+ |
*sv = sd->tLamb; |
596 |
+ |
sdf = sd->tf; |
597 |
+ |
} |
598 |
+ |
sv->cieY *= 1./M_PI; |
599 |
+ |
/* add non-diffuse components */ |
600 |
+ |
i = (sdf != NULL) ? sdf->ncomp : 0; |
601 |
+ |
while (i-- > 0) { |
602 |
+ |
nch = (*sdf->comp[i].func->getBSDFs)(coef, outVec, inVec, |
603 |
+ |
&sdf->comp[i]); |
604 |
+ |
while (nch-- > 0) { |
605 |
+ |
c_cmix(&sv->spec, sv->cieY, &sv->spec, |
606 |
+ |
coef[nch], &sdf->comp[i].cspec[nch]); |
607 |
+ |
sv->cieY += coef[nch]; |
608 |
+ |
} |
609 |
+ |
} |
610 |
+ |
/* make sure everything is set */ |
611 |
+ |
c_ccvt(&sv->spec, C_CSXY+C_CSSPEC); |
612 |
+ |
return SDEnone; |
613 |
+ |
} |
614 |
+ |
|
615 |
+ |
/* Compute directional hemispherical scattering at this incident angle */ |
616 |
+ |
double |
617 |
+ |
SDdirectHemi(const FVECT inVec, int sflags, const SDData *sd) |
618 |
+ |
{ |
619 |
+ |
double hsum; |
620 |
+ |
SDSpectralDF *rdf; |
621 |
+ |
const SDCDst *cd; |
622 |
+ |
int i; |
623 |
+ |
/* check arguments */ |
624 |
+ |
if ((inVec == NULL) | (sd == NULL)) |
625 |
+ |
return .0; |
626 |
+ |
/* gather diffuse components */ |
627 |
+ |
if (inVec[2] > 0) { |
628 |
+ |
hsum = sd->rLambFront.cieY; |
629 |
+ |
rdf = sd->rf; |
630 |
+ |
} else /* !inFront */ { |
631 |
+ |
hsum = sd->rLambBack.cieY; |
632 |
+ |
rdf = sd->rb; |
633 |
+ |
} |
634 |
+ |
if ((sflags & SDsampDf+SDsampR) != SDsampDf+SDsampR) |
635 |
+ |
hsum = .0; |
636 |
+ |
if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT) |
637 |
+ |
hsum += sd->tLamb.cieY; |
638 |
+ |
/* gather non-diffuse components */ |
639 |
+ |
i = ((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR && |
640 |
+ |
rdf != NULL) ? rdf->ncomp : 0; |
641 |
+ |
while (i-- > 0) { /* non-diffuse reflection */ |
642 |
+ |
cd = (*rdf->comp[i].func->getCDist)(inVec, &rdf->comp[i]); |
643 |
+ |
if (cd != NULL) |
644 |
+ |
hsum += cd->cTotal; |
645 |
+ |
} |
646 |
+ |
i = ((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT && |
647 |
+ |
sd->tf != NULL) ? sd->tf->ncomp : 0; |
648 |
+ |
while (i-- > 0) { /* non-diffuse transmission */ |
649 |
+ |
cd = (*sd->tf->comp[i].func->getCDist)(inVec, &sd->tf->comp[i]); |
650 |
+ |
if (cd != NULL) |
651 |
+ |
hsum += cd->cTotal; |
652 |
+ |
} |
653 |
+ |
return hsum; |
654 |
+ |
} |
655 |
+ |
|
656 |
+ |
/* Sample BSDF direction based on the given random variable */ |
657 |
+ |
SDError |
658 |
+ |
SDsampBSDF(SDValue *sv, FVECT ioVec, double randX, int sflags, const SDData *sd) |
659 |
+ |
{ |
660 |
+ |
SDError ec; |
661 |
+ |
FVECT inVec; |
662 |
+ |
int inFront; |
663 |
+ |
SDSpectralDF *rdf; |
664 |
+ |
double rdiff; |
665 |
+ |
float coef[SDmaxCh]; |
666 |
+ |
int i, j, n, nr; |
667 |
+ |
SDComponent *sdc; |
668 |
+ |
const SDCDst **cdarr = NULL; |
669 |
+ |
/* check arguments */ |
670 |
+ |
if ((sv == NULL) | (ioVec == NULL) | (sd == NULL) | |
671 |
+ |
(randX < 0) | (randX >= 1.)) |
672 |
+ |
return SDEargument; |
673 |
+ |
/* whose side are we on? */ |
674 |
+ |
VCOPY(inVec, ioVec); |
675 |
+ |
inFront = (inVec[2] > 0); |
676 |
+ |
/* remember diffuse portions */ |
677 |
+ |
if (inFront) { |
678 |
+ |
*sv = sd->rLambFront; |
679 |
+ |
rdf = sd->rf; |
680 |
+ |
} else /* !inFront */ { |
681 |
+ |
*sv = sd->rLambBack; |
682 |
+ |
rdf = sd->rb; |
683 |
+ |
} |
684 |
+ |
if ((sflags & SDsampDf+SDsampR) != SDsampDf+SDsampR) |
685 |
+ |
sv->cieY = .0; |
686 |
+ |
rdiff = sv->cieY; |
687 |
+ |
if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT) |
688 |
+ |
sv->cieY += sd->tLamb.cieY; |
689 |
+ |
/* gather non-diffuse components */ |
690 |
+ |
i = nr = ((sflags & SDsampSp+SDsampR) == SDsampSp+SDsampR && |
691 |
+ |
rdf != NULL) ? rdf->ncomp : 0; |
692 |
+ |
j = ((sflags & SDsampSp+SDsampT) == SDsampSp+SDsampT && |
693 |
+ |
sd->tf != NULL) ? sd->tf->ncomp : 0; |
694 |
+ |
n = i + j; |
695 |
+ |
if (n > 0 && (cdarr = (const SDCDst **)malloc(n*sizeof(SDCDst *))) == NULL) |
696 |
+ |
return SDEmemory; |
697 |
+ |
while (j-- > 0) { /* non-diffuse transmission */ |
698 |
+ |
cdarr[i+j] = (*sd->tf->comp[j].func->getCDist)(inVec, &sd->tf->comp[j]); |
699 |
+ |
if (cdarr[i+j] == NULL) { |
700 |
+ |
free(cdarr); |
701 |
+ |
return SDEmemory; |
702 |
+ |
} |
703 |
+ |
sv->cieY += cdarr[i+j]->cTotal; |
704 |
+ |
} |
705 |
+ |
while (i-- > 0) { /* non-diffuse reflection */ |
706 |
+ |
cdarr[i] = (*rdf->comp[i].func->getCDist)(inVec, &rdf->comp[i]); |
707 |
+ |
if (cdarr[i] == NULL) { |
708 |
+ |
free(cdarr); |
709 |
+ |
return SDEmemory; |
710 |
+ |
} |
711 |
+ |
sv->cieY += cdarr[i]->cTotal; |
712 |
+ |
} |
713 |
+ |
if (sv->cieY <= 1e-6) { /* anything to sample? */ |
714 |
+ |
sv->cieY = .0; |
715 |
+ |
memset(ioVec, 0, 3*sizeof(double)); |
716 |
+ |
return SDEnone; |
717 |
+ |
} |
718 |
+ |
/* scale random variable */ |
719 |
+ |
randX *= sv->cieY; |
720 |
+ |
/* diffuse reflection? */ |
721 |
+ |
if (randX < rdiff) { |
722 |
+ |
SDdiffuseSamp(ioVec, inFront, randX/rdiff); |
723 |
+ |
goto done; |
724 |
+ |
} |
725 |
+ |
randX -= rdiff; |
726 |
+ |
/* diffuse transmission? */ |
727 |
+ |
if ((sflags & SDsampDf+SDsampT) == SDsampDf+SDsampT) { |
728 |
+ |
if (randX < sd->tLamb.cieY) { |
729 |
+ |
sv->spec = sd->tLamb.spec; |
730 |
+ |
SDdiffuseSamp(ioVec, !inFront, randX/sd->tLamb.cieY); |
731 |
+ |
goto done; |
732 |
+ |
} |
733 |
+ |
randX -= sd->tLamb.cieY; |
734 |
+ |
} |
735 |
+ |
/* else one of cumulative dist. */ |
736 |
+ |
for (i = 0; i < n && randX < cdarr[i]->cTotal; i++) |
737 |
+ |
randX -= cdarr[i]->cTotal; |
738 |
+ |
if (i >= n) |
739 |
+ |
return SDEinternal; |
740 |
+ |
/* compute sample direction */ |
741 |
+ |
sdc = (i < nr) ? &rdf->comp[i] : &sd->tf->comp[i-nr]; |
742 |
+ |
ec = (*sdc->func->sampCDist)(ioVec, randX/cdarr[i]->cTotal, cdarr[i]); |
743 |
+ |
if (ec) |
744 |
+ |
return ec; |
745 |
+ |
/* compute color */ |
746 |
+ |
j = (*sdc->func->getBSDFs)(coef, ioVec, inVec, sdc); |
747 |
+ |
if (j <= 0) { |
748 |
+ |
sprintf(SDerrorDetail, "BSDF \"%s\" sampling value error", |
749 |
+ |
sd->name); |
750 |
+ |
return SDEinternal; |
751 |
+ |
} |
752 |
+ |
sv->spec = sdc->cspec[0]; |
753 |
+ |
rdiff = coef[0]; |
754 |
+ |
while (--j) { |
755 |
+ |
c_cmix(&sv->spec, rdiff, &sv->spec, coef[j], &sdc->cspec[j]); |
756 |
+ |
rdiff += coef[j]; |
757 |
+ |
} |
758 |
+ |
done: |
759 |
+ |
if (cdarr != NULL) |
760 |
+ |
free(cdarr); |
761 |
+ |
/* make sure everything is set */ |
762 |
+ |
c_ccvt(&sv->spec, C_CSXY+C_CSSPEC); |
763 |
+ |
return SDEnone; |
764 |
+ |
} |
765 |
+ |
|
766 |
+ |
/* Compute World->BSDF transform from surface normal and up (Y) vector */ |
767 |
+ |
SDError |
768 |
+ |
SDcompXform(RREAL vMtx[3][3], const FVECT sNrm, const FVECT uVec) |
769 |
+ |
{ |
770 |
+ |
if ((vMtx == NULL) | (sNrm == NULL) | (uVec == NULL)) |
771 |
+ |
return SDEargument; |
772 |
+ |
VCOPY(vMtx[2], sNrm); |
773 |
+ |
if (normalize(vMtx[2]) == 0) |
774 |
+ |
return SDEargument; |
775 |
+ |
fcross(vMtx[0], uVec, vMtx[2]); |
776 |
+ |
if (normalize(vMtx[0]) == 0) |
777 |
+ |
return SDEargument; |
778 |
+ |
fcross(vMtx[1], vMtx[2], vMtx[0]); |
779 |
+ |
return SDEnone; |
780 |
+ |
} |
781 |
+ |
|
782 |
+ |
/* Compute inverse transform */ |
783 |
+ |
SDError |
784 |
+ |
SDinvXform(RREAL iMtx[3][3], RREAL vMtx[3][3]) |
785 |
+ |
{ |
786 |
+ |
RREAL mTmp[3][3]; |
787 |
+ |
double d; |
788 |
+ |
|
789 |
+ |
if ((iMtx == NULL) | (vMtx == NULL)) |
790 |
+ |
return SDEargument; |
791 |
+ |
/* compute determinant */ |
792 |
+ |
mTmp[0][0] = vMtx[2][2]*vMtx[1][1] - vMtx[2][1]*vMtx[1][2]; |
793 |
+ |
mTmp[0][1] = vMtx[2][1]*vMtx[0][2] - vMtx[2][2]*vMtx[0][1]; |
794 |
+ |
mTmp[0][2] = vMtx[1][2]*vMtx[0][1] - vMtx[1][1]*vMtx[0][2]; |
795 |
+ |
d = vMtx[0][0]*mTmp[0][0] + vMtx[1][0]*mTmp[0][1] + vMtx[2][0]*mTmp[0][2]; |
796 |
+ |
if (d == 0) { |
797 |
+ |
strcpy(SDerrorDetail, "Zero determinant in matrix inversion"); |
798 |
+ |
return SDEargument; |
799 |
+ |
} |
800 |
+ |
d = 1./d; /* invert matrix */ |
801 |
+ |
mTmp[0][0] *= d; mTmp[0][1] *= d; mTmp[0][2] *= d; |
802 |
+ |
mTmp[1][0] = d*(vMtx[2][0]*vMtx[1][2] - vMtx[2][2]*vMtx[1][0]); |
803 |
+ |
mTmp[1][1] = d*(vMtx[2][2]*vMtx[0][0] - vMtx[2][0]*vMtx[0][2]); |
804 |
+ |
mTmp[1][2] = d*(vMtx[1][0]*vMtx[0][2] - vMtx[1][2]*vMtx[0][0]); |
805 |
+ |
mTmp[2][0] = d*(vMtx[2][1]*vMtx[1][0] - vMtx[2][0]*vMtx[1][1]); |
806 |
+ |
mTmp[2][1] = d*(vMtx[2][0]*vMtx[0][1] - vMtx[2][1]*vMtx[0][0]); |
807 |
+ |
mTmp[2][2] = d*(vMtx[1][1]*vMtx[0][0] - vMtx[1][0]*vMtx[0][1]); |
808 |
+ |
memcpy(iMtx, mTmp, sizeof(mTmp)); |
809 |
+ |
return SDEnone; |
810 |
+ |
} |
811 |
+ |
|
812 |
+ |
/* Transform and normalize direction (column) vector */ |
813 |
+ |
SDError |
814 |
+ |
SDmapDir(FVECT resVec, RREAL vMtx[3][3], const FVECT inpVec) |
815 |
+ |
{ |
816 |
+ |
FVECT vTmp; |
817 |
+ |
|
818 |
+ |
if ((resVec == NULL) | (inpVec == NULL)) |
819 |
+ |
return SDEargument; |
820 |
+ |
if (vMtx == NULL) { /* assume they just want to normalize */ |
821 |
+ |
if (resVec != inpVec) |
822 |
+ |
VCOPY(resVec, inpVec); |
823 |
+ |
return (normalize(resVec) > 0) ? SDEnone : SDEargument; |
824 |
+ |
} |
825 |
+ |
vTmp[0] = DOT(vMtx[0], inpVec); |
826 |
+ |
vTmp[1] = DOT(vMtx[1], inpVec); |
827 |
+ |
vTmp[2] = DOT(vMtx[2], inpVec); |
828 |
+ |
if (normalize(vTmp) == 0) |
829 |
+ |
return SDEargument; |
830 |
+ |
VCOPY(resVec, vTmp); |
831 |
+ |
return SDEnone; |
832 |
+ |
} |
833 |
+ |
|
834 |
+ |
/*################################################################*/ |
835 |
+ |
/*######### DEPRECATED ROUTINES AWAITING PERMANENT REMOVAL #######*/ |
836 |
+ |
|
837 |
+ |
/* |
838 |
|
* Routines for handling BSDF data |
839 |
|
*/ |
840 |
|
|
841 |
|
#include "standard.h" |
9 |
– |
#include "bsdf.h" |
842 |
|
#include "paths.h" |
11 |
– |
#include "ezxml.h" |
12 |
– |
#include <ctype.h> |
843 |
|
|
844 |
|
#define MAXLATS 46 /* maximum number of latitudes */ |
845 |
|
|
853 |
|
} lat[MAXLATS+1]; /* latitudes */ |
854 |
|
} ANGLE_BASIS; |
855 |
|
|
856 |
< |
#define MAXABASES 3 /* limit on defined bases */ |
856 |
> |
#define MAXABASES 7 /* limit on defined bases */ |
857 |
|
|
858 |
|
static ANGLE_BASIS abase_list[MAXABASES] = { |
859 |
|
{ |
891 |
|
|
892 |
|
static int nabases = 3; /* current number of defined bases */ |
893 |
|
|
894 |
+ |
#define FEQ(a,b) ((a)-(b) <= 1e-6 && (b)-(a) <= 1e-6) |
895 |
|
|
896 |
|
static int |
897 |
+ |
fequal(double a, double b) |
898 |
+ |
{ |
899 |
+ |
if (b != 0) |
900 |
+ |
a = a/b - 1.; |
901 |
+ |
return((a <= 1e-6) & (a >= -1e-6)); |
902 |
+ |
} |
903 |
+ |
|
904 |
+ |
/* Returns the name of the given tag */ |
905 |
+ |
#ifdef ezxml_name |
906 |
+ |
#undef ezxml_name |
907 |
+ |
static char * |
908 |
+ |
ezxml_name(ezxml_t xml) |
909 |
+ |
{ |
910 |
+ |
if (xml == NULL) |
911 |
+ |
return(NULL); |
912 |
+ |
return(xml->name); |
913 |
+ |
} |
914 |
+ |
#endif |
915 |
+ |
|
916 |
+ |
/* Returns the given tag's character content or empty string if none */ |
917 |
+ |
#ifdef ezxml_txt |
918 |
+ |
#undef ezxml_txt |
919 |
+ |
static char * |
920 |
+ |
ezxml_txt(ezxml_t xml) |
921 |
+ |
{ |
922 |
+ |
if (xml == NULL) |
923 |
+ |
return(""); |
924 |
+ |
return(xml->txt); |
925 |
+ |
} |
926 |
+ |
#endif |
927 |
+ |
|
928 |
+ |
|
929 |
+ |
static int |
930 |
|
ab_getvec( /* get vector for this angle basis index */ |
931 |
|
FVECT v, |
932 |
|
int ndx, |
935 |
|
{ |
936 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
937 |
|
int li; |
938 |
< |
double alt, azi, d; |
938 |
> |
double pol, azi, d; |
939 |
|
|
940 |
|
if ((ndx < 0) | (ndx >= ab->nangles)) |
941 |
|
return(0); |
942 |
|
for (li = 0; ndx >= ab->lat[li].nphis; li++) |
943 |
|
ndx -= ab->lat[li].nphis; |
944 |
< |
alt = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
944 |
> |
pol = PI/180.*0.5*(ab->lat[li].tmin + ab->lat[li+1].tmin); |
945 |
|
azi = 2.*PI*ndx/ab->lat[li].nphis; |
946 |
< |
v[2] = d = cos(alt); |
947 |
< |
d = sqrt(1. - d*d); /* sin(alt) */ |
946 |
> |
v[2] = d = cos(pol); |
947 |
> |
d = sqrt(1. - d*d); /* sin(pol) */ |
948 |
|
v[0] = cos(azi)*d; |
949 |
|
v[1] = sin(azi)*d; |
950 |
|
return(1); |
959 |
|
{ |
960 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
961 |
|
int li, ndx; |
962 |
< |
double alt, azi, d; |
962 |
> |
double pol, azi; |
963 |
|
|
964 |
|
if ((v[2] < -1.0) | (v[2] > 1.0)) |
965 |
|
return(-1); |
966 |
< |
alt = 180.0/PI*acos(v[2]); |
966 |
> |
pol = 180.0/PI*acos(v[2]); |
967 |
|
azi = 180.0/PI*atan2(v[1], v[0]); |
968 |
|
if (azi < 0.0) azi += 360.0; |
969 |
< |
for (li = 1; ab->lat[li].tmin <= alt; li++) |
969 |
> |
for (li = 1; ab->lat[li].tmin <= pol; li++) |
970 |
|
if (!ab->lat[li].nphis) |
971 |
|
return(-1); |
972 |
|
--li; |
1038 |
|
|
1039 |
|
|
1040 |
|
static void |
1041 |
+ |
load_angle_basis( /* load custom BSDF angle basis */ |
1042 |
+ |
ezxml_t wab |
1043 |
+ |
) |
1044 |
+ |
{ |
1045 |
+ |
char *abname = ezxml_txt(ezxml_child(wab, "AngleBasisName")); |
1046 |
+ |
ezxml_t wbb; |
1047 |
+ |
int i; |
1048 |
+ |
|
1049 |
+ |
if (!abname || !*abname) |
1050 |
+ |
return; |
1051 |
+ |
for (i = nabases; i--; ) |
1052 |
+ |
if (!strcasecmp(abname, abase_list[i].name)) |
1053 |
+ |
return; /* assume it's the same */ |
1054 |
+ |
if (nabases >= MAXABASES) |
1055 |
+ |
error(INTERNAL, "too many angle bases"); |
1056 |
+ |
strcpy(abase_list[nabases].name, abname); |
1057 |
+ |
abase_list[nabases].nangles = 0; |
1058 |
+ |
for (i = 0, wbb = ezxml_child(wab, "AngleBasisBlock"); |
1059 |
+ |
wbb != NULL; i++, wbb = wbb->next) { |
1060 |
+ |
if (i >= MAXLATS) |
1061 |
+ |
error(INTERNAL, "too many latitudes in custom basis"); |
1062 |
+ |
abase_list[nabases].lat[i+1].tmin = atof(ezxml_txt( |
1063 |
+ |
ezxml_child(ezxml_child(wbb, |
1064 |
+ |
"ThetaBounds"), "UpperTheta"))); |
1065 |
+ |
if (!i) |
1066 |
+ |
abase_list[nabases].lat[i].tmin = |
1067 |
+ |
-abase_list[nabases].lat[i+1].tmin; |
1068 |
+ |
else if (!fequal(atof(ezxml_txt(ezxml_child(ezxml_child(wbb, |
1069 |
+ |
"ThetaBounds"), "LowerTheta"))), |
1070 |
+ |
abase_list[nabases].lat[i].tmin)) |
1071 |
+ |
error(WARNING, "theta values disagree in custom basis"); |
1072 |
+ |
abase_list[nabases].nangles += |
1073 |
+ |
abase_list[nabases].lat[i].nphis = |
1074 |
+ |
atoi(ezxml_txt(ezxml_child(wbb, "nPhis"))); |
1075 |
+ |
} |
1076 |
+ |
abase_list[nabases++].lat[i].nphis = 0; |
1077 |
+ |
} |
1078 |
+ |
|
1079 |
+ |
|
1080 |
+ |
static void |
1081 |
+ |
load_geometry( /* load geometric dimensions and description (if any) */ |
1082 |
+ |
struct BSDF_data *dp, |
1083 |
+ |
ezxml_t wdb |
1084 |
+ |
) |
1085 |
+ |
{ |
1086 |
+ |
ezxml_t geom; |
1087 |
+ |
double cfact; |
1088 |
+ |
const char *fmt, *mgfstr; |
1089 |
+ |
|
1090 |
+ |
dp->dim[0] = dp->dim[1] = dp->dim[2] = 0; |
1091 |
+ |
dp->mgf = NULL; |
1092 |
+ |
if ((geom = ezxml_child(wdb, "Width")) != NULL) |
1093 |
+ |
dp->dim[0] = atof(ezxml_txt(geom)) * |
1094 |
+ |
to_meters(ezxml_attr(geom, "unit")); |
1095 |
+ |
if ((geom = ezxml_child(wdb, "Height")) != NULL) |
1096 |
+ |
dp->dim[1] = atof(ezxml_txt(geom)) * |
1097 |
+ |
to_meters(ezxml_attr(geom, "unit")); |
1098 |
+ |
if ((geom = ezxml_child(wdb, "Thickness")) != NULL) |
1099 |
+ |
dp->dim[2] = atof(ezxml_txt(geom)) * |
1100 |
+ |
to_meters(ezxml_attr(geom, "unit")); |
1101 |
+ |
if ((geom = ezxml_child(wdb, "Geometry")) == NULL || |
1102 |
+ |
(mgfstr = ezxml_txt(geom)) == NULL) |
1103 |
+ |
return; |
1104 |
+ |
if ((fmt = ezxml_attr(geom, "format")) != NULL && |
1105 |
+ |
strcasecmp(fmt, "MGF")) { |
1106 |
+ |
sprintf(errmsg, "unrecognized geometry format '%s'", fmt); |
1107 |
+ |
error(WARNING, errmsg); |
1108 |
+ |
return; |
1109 |
+ |
} |
1110 |
+ |
cfact = to_meters(ezxml_attr(geom, "unit")); |
1111 |
+ |
dp->mgf = (char *)malloc(strlen(mgfstr)+32); |
1112 |
+ |
if (dp->mgf == NULL) |
1113 |
+ |
error(SYSTEM, "out of memory in load_geometry"); |
1114 |
+ |
if (cfact < 0.99 || cfact > 1.01) |
1115 |
+ |
sprintf(dp->mgf, "xf -s %.5f\n%s\nxf\n", cfact, mgfstr); |
1116 |
+ |
else |
1117 |
+ |
strcpy(dp->mgf, mgfstr); |
1118 |
+ |
} |
1119 |
+ |
|
1120 |
+ |
|
1121 |
+ |
static void |
1122 |
|
load_bsdf_data( /* load BSDF distribution for this wavelength */ |
1123 |
|
struct BSDF_data *dp, |
1124 |
|
ezxml_t wdb |
1129 |
|
char *sdata; |
1130 |
|
int i; |
1131 |
|
|
1132 |
< |
if ((cbasis == NULL) | (rbasis == NULL)) { |
1132 |
> |
if ((!cbasis || !*cbasis) | (!rbasis || !*rbasis)) { |
1133 |
|
error(WARNING, "missing column/row basis for BSDF"); |
1134 |
|
return; |
1135 |
|
} |
191 |
– |
/* XXX need to add routines for loading in foreign bases */ |
1136 |
|
for (i = nabases; i--; ) |
1137 |
< |
if (!strcmp(cbasis, abase_list[i].name)) { |
1137 |
> |
if (!strcasecmp(cbasis, abase_list[i].name)) { |
1138 |
|
dp->ninc = abase_list[i].nangles; |
1139 |
|
dp->ib_priv = (void *)&abase_list[i]; |
1140 |
|
dp->ib_vec = ab_getvecR; |
1143 |
|
break; |
1144 |
|
} |
1145 |
|
if (i < 0) { |
1146 |
< |
sprintf(errmsg, "unsupported ColumnAngleBasis '%s'", cbasis); |
1146 |
> |
sprintf(errmsg, "undefined ColumnAngleBasis '%s'", cbasis); |
1147 |
|
error(WARNING, errmsg); |
1148 |
|
return; |
1149 |
|
} |
1150 |
|
for (i = nabases; i--; ) |
1151 |
< |
if (!strcmp(rbasis, abase_list[i].name)) { |
1151 |
> |
if (!strcasecmp(rbasis, abase_list[i].name)) { |
1152 |
|
dp->nout = abase_list[i].nangles; |
1153 |
|
dp->ob_priv = (void *)&abase_list[i]; |
1154 |
|
dp->ob_vec = ab_getvec; |
1157 |
|
break; |
1158 |
|
} |
1159 |
|
if (i < 0) { |
1160 |
< |
sprintf(errmsg, "unsupported RowAngleBasis '%s'", cbasis); |
1160 |
> |
sprintf(errmsg, "undefined RowAngleBasis '%s'", rbasis); |
1161 |
|
error(WARNING, errmsg); |
1162 |
|
return; |
1163 |
|
} |
1164 |
|
/* read BSDF data */ |
1165 |
|
sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData")); |
1166 |
< |
if (sdata == NULL) { |
1166 |
> |
if (!sdata || !*sdata) { |
1167 |
|
error(WARNING, "missing BSDF ScatteringData"); |
1168 |
|
return; |
1169 |
|
} |
1187 |
|
sdata++; |
1188 |
|
if (*sdata) { |
1189 |
|
sprintf(errmsg, "%d extra characters after BSDF ScatteringData", |
1190 |
< |
strlen(sdata)); |
1190 |
> |
(int)strlen(sdata)); |
1191 |
|
error(WARNING, errmsg); |
1192 |
|
} |
1193 |
|
} |
1198 |
|
struct BSDF_data *dp |
1199 |
|
) |
1200 |
|
{ |
1201 |
< |
double * omega_arr; |
1202 |
< |
double dom, hemi_total; |
1201 |
> |
double *omega_iarr, *omega_oarr; |
1202 |
> |
double dom, hemi_total, full_total; |
1203 |
|
int nneg; |
1204 |
+ |
FVECT v; |
1205 |
|
int i, o; |
1206 |
|
|
1207 |
|
if (dp == NULL || dp->bsdf == NULL) |
1208 |
|
return(0); |
1209 |
< |
omega_arr = (double *)calloc(dp->nout, sizeof(double)); |
1210 |
< |
if (omega_arr == NULL) |
1209 |
> |
omega_iarr = (double *)calloc(dp->ninc, sizeof(double)); |
1210 |
> |
omega_oarr = (double *)calloc(dp->nout, sizeof(double)); |
1211 |
> |
if ((omega_iarr == NULL) | (omega_oarr == NULL)) |
1212 |
|
error(SYSTEM, "out of memory in check_bsdf_data"); |
1213 |
+ |
/* incoming projected solid angles */ |
1214 |
|
hemi_total = .0; |
1215 |
+ |
for (i = dp->ninc; i--; ) { |
1216 |
+ |
dom = getBSDF_incohm(dp,i); |
1217 |
+ |
if (dom <= 0) { |
1218 |
+ |
error(WARNING, "zero/negative incoming solid angle"); |
1219 |
+ |
continue; |
1220 |
+ |
} |
1221 |
+ |
if (!getBSDF_incvec(v,dp,i) || v[2] > FTINY) { |
1222 |
+ |
error(WARNING, "illegal incoming BSDF direction"); |
1223 |
+ |
free(omega_iarr); free(omega_oarr); |
1224 |
+ |
return(0); |
1225 |
+ |
} |
1226 |
+ |
hemi_total += omega_iarr[i] = dom * -v[2]; |
1227 |
+ |
} |
1228 |
+ |
if ((hemi_total > 1.02*PI) | (hemi_total < 0.98*PI)) { |
1229 |
+ |
sprintf(errmsg, "incoming BSDF hemisphere off by %.1f%%", |
1230 |
+ |
100.*(hemi_total/PI - 1.)); |
1231 |
+ |
error(WARNING, errmsg); |
1232 |
+ |
} |
1233 |
+ |
dom = PI / hemi_total; /* fix normalization */ |
1234 |
+ |
for (i = dp->ninc; i--; ) |
1235 |
+ |
omega_iarr[i] *= dom; |
1236 |
+ |
/* outgoing projected solid angles */ |
1237 |
+ |
hemi_total = .0; |
1238 |
|
for (o = dp->nout; o--; ) { |
269 |
– |
FVECT v; |
1239 |
|
dom = getBSDF_outohm(dp,o); |
1240 |
< |
if (dom <= .0) { |
1241 |
< |
error(WARNING, "zero/negative solid angle"); |
1240 |
> |
if (dom <= 0) { |
1241 |
> |
error(WARNING, "zero/negative outgoing solid angle"); |
1242 |
|
continue; |
1243 |
|
} |
1244 |
|
if (!getBSDF_outvec(v,dp,o) || v[2] < -FTINY) { |
1245 |
|
error(WARNING, "illegal outgoing BSDF direction"); |
1246 |
< |
free(omega_arr); |
1246 |
> |
free(omega_iarr); free(omega_oarr); |
1247 |
|
return(0); |
1248 |
|
} |
1249 |
< |
hemi_total += omega_arr[o] = dom*v[2]; |
1249 |
> |
hemi_total += omega_oarr[o] = dom * v[2]; |
1250 |
|
} |
1251 |
|
if ((hemi_total > 1.02*PI) | (hemi_total < 0.98*PI)) { |
1252 |
|
sprintf(errmsg, "outgoing BSDF hemisphere off by %.1f%%", |
1253 |
|
100.*(hemi_total/PI - 1.)); |
1254 |
|
error(WARNING, errmsg); |
1255 |
|
} |
1256 |
< |
dom = PI / hemi_total; /* normalize solid angles */ |
1256 |
> |
dom = PI / hemi_total; /* fix normalization */ |
1257 |
|
for (o = dp->nout; o--; ) |
1258 |
< |
omega_arr[o] *= dom; |
1259 |
< |
nneg = 0; |
1260 |
< |
for (i = dp->ninc; i--; ) { |
1258 |
> |
omega_oarr[o] *= dom; |
1259 |
> |
nneg = 0; /* check outgoing totals */ |
1260 |
> |
for (i = 0; i < dp->ninc; i++) { |
1261 |
|
hemi_total = .0; |
1262 |
|
for (o = dp->nout; o--; ) { |
1263 |
|
double f = BSDF_value(dp,i,o); |
1264 |
< |
if (f > .0) |
1265 |
< |
hemi_total += f*omega_arr[o]; |
1266 |
< |
else if (f < -FTINY) |
1267 |
< |
++nneg; |
1264 |
> |
if (f >= 0) |
1265 |
> |
hemi_total += f*omega_oarr[o]; |
1266 |
> |
else { |
1267 |
> |
nneg += (f < -FTINY); |
1268 |
> |
BSDF_value(dp,i,o) = .0f; |
1269 |
> |
} |
1270 |
|
} |
1271 |
< |
if (hemi_total > 1.02) { |
1272 |
< |
sprintf(errmsg, "BSDF direction passes %.1f%% of light", |
1273 |
< |
100.*hemi_total); |
1271 |
> |
if (hemi_total > 1.01) { |
1272 |
> |
sprintf(errmsg, |
1273 |
> |
"incoming BSDF direction %d passes %.1f%% of light", |
1274 |
> |
i, 100.*hemi_total); |
1275 |
|
error(WARNING, errmsg); |
1276 |
|
} |
1277 |
|
} |
1278 |
< |
free(omega_arr); |
1279 |
< |
if (nneg > 0) { |
308 |
< |
sprintf(errmsg, "%d negative BSDF values", nneg); |
1278 |
> |
if (nneg) { |
1279 |
> |
sprintf(errmsg, "%d negative BSDF values (ignored)", nneg); |
1280 |
|
error(WARNING, errmsg); |
310 |
– |
return(0); |
1281 |
|
} |
1282 |
+ |
full_total = .0; /* reverse roles and check again */ |
1283 |
+ |
for (o = 0; o < dp->nout; o++) { |
1284 |
+ |
hemi_total = .0; |
1285 |
+ |
for (i = dp->ninc; i--; ) |
1286 |
+ |
hemi_total += BSDF_value(dp,i,o) * omega_iarr[i]; |
1287 |
+ |
|
1288 |
+ |
if (hemi_total > 1.01) { |
1289 |
+ |
sprintf(errmsg, |
1290 |
+ |
"outgoing BSDF direction %d collects %.1f%% of light", |
1291 |
+ |
o, 100.*hemi_total); |
1292 |
+ |
error(WARNING, errmsg); |
1293 |
+ |
} |
1294 |
+ |
full_total += hemi_total*omega_oarr[o]; |
1295 |
+ |
} |
1296 |
+ |
full_total /= PI; |
1297 |
+ |
if (full_total > 1.00001) { |
1298 |
+ |
sprintf(errmsg, "BSDF transfers %.4f%% of light", |
1299 |
+ |
100.*full_total); |
1300 |
+ |
error(WARNING, errmsg); |
1301 |
+ |
} |
1302 |
+ |
free(omega_iarr); free(omega_oarr); |
1303 |
|
return(1); |
1304 |
|
} |
1305 |
|
|
1306 |
+ |
|
1307 |
|
struct BSDF_data * |
1308 |
|
load_BSDF( /* load BSDF data from file */ |
1309 |
|
char *fname |
1340 |
|
return(NULL); |
1341 |
|
} |
1342 |
|
wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer"); |
1343 |
+ |
if (strcasecmp(ezxml_txt(ezxml_child(ezxml_child(wtl, |
1344 |
+ |
"DataDefinition"), "IncidentDataStructure")), |
1345 |
+ |
"Columns")) { |
1346 |
+ |
sprintf(errmsg, |
1347 |
+ |
"BSDF \"%s\": unsupported IncidentDataStructure", |
1348 |
+ |
path); |
1349 |
+ |
error(WARNING, errmsg); |
1350 |
+ |
ezxml_free(fl); |
1351 |
+ |
return(NULL); |
1352 |
+ |
} |
1353 |
+ |
for (wld = ezxml_child(ezxml_child(wtl, |
1354 |
+ |
"DataDefinition"), "AngleBasis"); |
1355 |
+ |
wld != NULL; wld = wld->next) |
1356 |
+ |
load_angle_basis(wld); |
1357 |
|
dp = (struct BSDF_data *)calloc(1, sizeof(struct BSDF_data)); |
1358 |
+ |
load_geometry(dp, ezxml_child(wtl, "Material")); |
1359 |
|
for (wld = ezxml_child(wtl, "WavelengthData"); |
1360 |
|
wld != NULL; wld = wld->next) { |
1361 |
< |
if (strcmp(ezxml_txt(ezxml_child(wld,"Wavelength")), "Visible")) |
1361 |
> |
if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")), |
1362 |
> |
"Visible")) |
1363 |
|
continue; |
1364 |
< |
wdb = ezxml_child(wld, "WavelengthDataBlock"); |
1365 |
< |
if (wdb == NULL) continue; |
1366 |
< |
if (strcmp(ezxml_txt(ezxml_child(wdb,"WavelengthDataDirection")), |
1364 |
> |
for (wdb = ezxml_child(wld, "WavelengthDataBlock"); |
1365 |
> |
wdb != NULL; wdb = wdb->next) |
1366 |
> |
if (!strcasecmp(ezxml_txt(ezxml_child(wdb, |
1367 |
> |
"WavelengthDataDirection")), |
1368 |
|
"Transmission Front")) |
1369 |
< |
continue; |
1370 |
< |
load_bsdf_data(dp, wdb); /* load front BTDF */ |
1371 |
< |
break; /* ignore the rest */ |
1369 |
> |
break; |
1370 |
> |
if (wdb != NULL) { /* load front BTDF */ |
1371 |
> |
load_bsdf_data(dp, wdb); |
1372 |
> |
break; /* ignore the rest */ |
1373 |
> |
} |
1374 |
|
} |
1375 |
|
ezxml_free(fl); /* done with XML file */ |
1376 |
|
if (!check_bsdf_data(dp)) { |
1390 |
|
{ |
1391 |
|
if (b == NULL) |
1392 |
|
return; |
1393 |
+ |
if (b->mgf != NULL) |
1394 |
+ |
free(b->mgf); |
1395 |
|
if (b->bsdf != NULL) |
1396 |
|
free(b->bsdf); |
1397 |
|
free(b); |
1448 |
|
} |
1449 |
|
|
1450 |
|
|
438 |
– |
#define FEQ(a,b) ((a)-(b) <= 1e-7 && (b)-(a) <= 1e-7) |
439 |
– |
|
1451 |
|
static int |
1452 |
|
addrot( /* compute rotation (x,y,z) => (xp,yp,zp) */ |
1453 |
|
char *xfarg[], |
1498 |
|
getBSDF_xfm( /* compute BSDF orient. -> world orient. transform */ |
1499 |
|
MAT4 xm, |
1500 |
|
FVECT nrm, |
1501 |
< |
UpDir ud |
1501 |
> |
UpDir ud, |
1502 |
> |
char *xfbuf |
1503 |
|
) |
1504 |
|
{ |
1505 |
|
char *xfargs[7]; |
1506 |
|
XF myxf; |
1507 |
|
FVECT updir, xdest, ydest; |
1508 |
+ |
int i; |
1509 |
|
|
1510 |
|
updir[0] = updir[1] = updir[2] = 0.; |
1511 |
|
switch (ud) { |
1536 |
|
fcross(ydest, nrm, xdest); |
1537 |
|
xf(&myxf, addrot(xfargs, xdest, ydest, nrm), xfargs); |
1538 |
|
copymat4(xm, myxf.xfm); |
1539 |
+ |
if (xfbuf == NULL) |
1540 |
+ |
return(1); |
1541 |
+ |
/* return xf arguments as well */ |
1542 |
+ |
for (i = 0; xfargs[i] != NULL; i++) { |
1543 |
+ |
*xfbuf++ = ' '; |
1544 |
+ |
strcpy(xfbuf, xfargs[i]); |
1545 |
+ |
while (*xfbuf) ++xfbuf; |
1546 |
+ |
} |
1547 |
|
return(1); |
1548 |
|
} |
1549 |
+ |
|
1550 |
+ |
/*######### END DEPRECATED ROUTINES #######*/ |
1551 |
+ |
/*################################################################*/ |