| 23 |  | }       lat[MAXLATS+1];         /* latitudes */ | 
| 24 |  | } ANGLE_BASIS; | 
| 25 |  |  | 
| 26 | < | #define MAXABASES       5               /* limit on defined bases */ | 
| 26 | > | #define MAXABASES       7               /* limit on defined bases */ | 
| 27 |  |  | 
| 28 |  | static ANGLE_BASIS      abase_list[MAXABASES] = { | 
| 29 |  | { | 
| 61 |  |  | 
| 62 |  | static int      nabases = 3;    /* current number of defined bases */ | 
| 63 |  |  | 
| 64 | < | #define  FEQ(a,b)       ((a)-(b) <= 1e-7 && (b)-(a) <= 1e-7) | 
| 64 | > | #define  FEQ(a,b)       ((a)-(b) <= 1e-6 && (b)-(a) <= 1e-6) | 
| 65 |  |  | 
| 66 | + | static int | 
| 67 | + | fequal(double a, double b) | 
| 68 | + | { | 
| 69 | + | if (b != .0) | 
| 70 | + | a = a/b - 1.; | 
| 71 | + | return((a <= 1e-6) & (a >= -1e-6)); | 
| 72 | + | } | 
| 73 | + |  | 
| 74 |  | // returns the name of the given tag | 
| 75 |  | #ifdef ezxml_name | 
| 76 |  | #undef ezxml_name | 
| 208 |  |  | 
| 209 |  |  | 
| 210 |  | static void | 
| 211 | < | load_angle_basis(       /* load BSDF angle basis */ | 
| 211 | > | load_angle_basis(       /* load custom BSDF angle basis */ | 
| 212 |  | ezxml_t wab | 
| 213 |  | ) | 
| 214 |  | { | 
| 216 |  | ezxml_t wbb; | 
| 217 |  | int     i; | 
| 218 |  |  | 
| 219 | < | if (abname == NULL || !*abname) | 
| 219 | > | if (!abname || !*abname) | 
| 220 |  | return; | 
| 221 |  | for (i = nabases; i--; ) | 
| 222 | < | if (!strcmp(abname, abase_list[i].name)) | 
| 223 | < | return;         /* XXX assume it's the same */ | 
| 222 | > | if (!strcasecmp(abname, abase_list[i].name)) | 
| 223 | > | return;         /* assume it's the same */ | 
| 224 |  | if (nabases >= MAXABASES) | 
| 225 |  | error(INTERNAL, "too many angle bases"); | 
| 226 |  | strcpy(abase_list[nabases].name, abname); | 
| 235 |  | if (!i) | 
| 236 |  | abase_list[nabases].lat[i].tmin = | 
| 237 |  | -abase_list[nabases].lat[i+1].tmin; | 
| 238 | < | else if (!FEQ(atof(ezxml_txt(ezxml_child(ezxml_child(wbb, | 
| 238 | > | else if (!fequal(atof(ezxml_txt(ezxml_child(ezxml_child(wbb, | 
| 239 |  | "ThetaBounds"), "LowerTheta"))), | 
| 240 |  | abase_list[nabases].lat[i].tmin)) | 
| 241 |  | error(WARNING, "theta values disagree in custom basis"); | 
| 247 |  | } | 
| 248 |  |  | 
| 249 |  |  | 
| 250 | + | static double | 
| 251 | + | to_meters(              /* return factor to convert given unit to meters */ | 
| 252 | + | const char *unit | 
| 253 | + | ) | 
| 254 | + | { | 
| 255 | + | if (unit == NULL) return(1.);           /* safe assumption? */ | 
| 256 | + | if (!strcasecmp(unit, "Meter")) return(1.); | 
| 257 | + | if (!strcasecmp(unit, "Foot")) return(.3048); | 
| 258 | + | if (!strcasecmp(unit, "Inch")) return(.0254); | 
| 259 | + | if (!strcasecmp(unit, "Centimeter")) return(.01); | 
| 260 | + | if (!strcasecmp(unit, "Millimeter")) return(.001); | 
| 261 | + | sprintf(errmsg, "unknown dimensional unit '%s'", unit); | 
| 262 | + | error(USER, errmsg); | 
| 263 | + | } | 
| 264 | + |  | 
| 265 | + |  | 
| 266 |  | static void | 
| 267 | + | load_geometry(          /* load geometric dimensions and description (if any) */ | 
| 268 | + | struct BSDF_data *dp, | 
| 269 | + | ezxml_t wdb | 
| 270 | + | ) | 
| 271 | + | { | 
| 272 | + | ezxml_t         geom; | 
| 273 | + | double          cfact; | 
| 274 | + | const char      *fmt, *mgfstr; | 
| 275 | + |  | 
| 276 | + | dp->dim[0] = dp->dim[1] = dp->dim[2] = 0; | 
| 277 | + | dp->mgf = NULL; | 
| 278 | + | if ((geom = ezxml_child(wdb, "Width")) != NULL) | 
| 279 | + | dp->dim[0] = atof(ezxml_txt(geom)) * | 
| 280 | + | to_meters(ezxml_attr(geom, "unit")); | 
| 281 | + | if ((geom = ezxml_child(wdb, "Height")) != NULL) | 
| 282 | + | dp->dim[1] = atof(ezxml_txt(geom)) * | 
| 283 | + | to_meters(ezxml_attr(geom, "unit")); | 
| 284 | + | if ((geom = ezxml_child(wdb, "Thickness")) != NULL) | 
| 285 | + | dp->dim[2] = atof(ezxml_txt(geom)) * | 
| 286 | + | to_meters(ezxml_attr(geom, "unit")); | 
| 287 | + | if ((geom = ezxml_child(wdb, "Geometry")) == NULL || | 
| 288 | + | (mgfstr = ezxml_txt(geom)) == NULL) | 
| 289 | + | return; | 
| 290 | + | if ((fmt = ezxml_attr(geom, "format")) != NULL && | 
| 291 | + | strcasecmp(fmt, "MGF")) { | 
| 292 | + | sprintf(errmsg, "unrecognized geometry format '%s'", fmt); | 
| 293 | + | error(WARNING, errmsg); | 
| 294 | + | return; | 
| 295 | + | } | 
| 296 | + | cfact = to_meters(ezxml_attr(geom, "unit")); | 
| 297 | + | dp->mgf = (char *)malloc(strlen(mgfstr)+32); | 
| 298 | + | if (dp->mgf == NULL) | 
| 299 | + | error(SYSTEM, "out of memory in load_geometry"); | 
| 300 | + | if (cfact < 0.99 || cfact > 1.01) | 
| 301 | + | sprintf(dp->mgf, "xf -s %.5f\n%s\nxf\n", cfact, mgfstr); | 
| 302 | + | else | 
| 303 | + | strcpy(dp->mgf, mgfstr); | 
| 304 | + | } | 
| 305 | + |  | 
| 306 | + |  | 
| 307 | + | static void | 
| 308 |  | load_bsdf_data(         /* load BSDF distribution for this wavelength */ | 
| 309 |  | struct BSDF_data *dp, | 
| 310 |  | ezxml_t wdb | 
| 315 |  | char  *sdata; | 
| 316 |  | int  i; | 
| 317 |  |  | 
| 318 | < | if ((cbasis == NULL || !*cbasis) | (rbasis == NULL || !*rbasis)) { | 
| 318 | > | if ((!cbasis || !*cbasis) | (!rbasis || !*rbasis)) { | 
| 319 |  | error(WARNING, "missing column/row basis for BSDF"); | 
| 320 |  | return; | 
| 321 |  | } | 
| 257 | – | /* XXX need to add routines for loading in foreign bases */ | 
| 322 |  | for (i = nabases; i--; ) | 
| 323 | < | if (!strcmp(cbasis, abase_list[i].name)) { | 
| 323 | > | if (!strcasecmp(cbasis, abase_list[i].name)) { | 
| 324 |  | dp->ninc = abase_list[i].nangles; | 
| 325 |  | dp->ib_priv = (void *)&abase_list[i]; | 
| 326 |  | dp->ib_vec = ab_getvecR; | 
| 329 |  | break; | 
| 330 |  | } | 
| 331 |  | if (i < 0) { | 
| 332 | < | sprintf(errmsg, "unsupported ColumnAngleBasis '%s'", cbasis); | 
| 332 | > | sprintf(errmsg, "undefined ColumnAngleBasis '%s'", cbasis); | 
| 333 |  | error(WARNING, errmsg); | 
| 334 |  | return; | 
| 335 |  | } | 
| 336 |  | for (i = nabases; i--; ) | 
| 337 | < | if (!strcmp(rbasis, abase_list[i].name)) { | 
| 337 | > | if (!strcasecmp(rbasis, abase_list[i].name)) { | 
| 338 |  | dp->nout = abase_list[i].nangles; | 
| 339 |  | dp->ob_priv = (void *)&abase_list[i]; | 
| 340 |  | dp->ob_vec = ab_getvec; | 
| 343 |  | break; | 
| 344 |  | } | 
| 345 |  | if (i < 0) { | 
| 346 | < | sprintf(errmsg, "unsupported RowAngleBasis '%s'", cbasis); | 
| 346 | > | sprintf(errmsg, "undefined RowAngleBasis '%s'", cbasis); | 
| 347 |  | error(WARNING, errmsg); | 
| 348 |  | return; | 
| 349 |  | } | 
| 350 |  | /* read BSDF data */ | 
| 351 |  | sdata  = ezxml_txt(ezxml_child(wdb,"ScatteringData")); | 
| 352 | < | if (sdata == NULL || !*sdata) { | 
| 352 | > | if (!sdata || !*sdata) { | 
| 353 |  | error(WARNING, "missing BSDF ScatteringData"); | 
| 354 |  | return; | 
| 355 |  | } | 
| 373 |  | sdata++; | 
| 374 |  | if (*sdata) { | 
| 375 |  | sprintf(errmsg, "%d extra characters after BSDF ScatteringData", | 
| 376 | < | strlen(sdata)); | 
| 376 | > | (int)strlen(sdata)); | 
| 377 |  | error(WARNING, errmsg); | 
| 378 |  | } | 
| 379 |  | } | 
| 385 |  | ) | 
| 386 |  | { | 
| 387 |  | double          *omega_iarr, *omega_oarr; | 
| 388 | < | double          dom, contrib, hemi_total; | 
| 388 | > | double          dom, contrib, hemi_total, full_total; | 
| 389 |  | int             nneg; | 
| 390 |  | FVECT           v; | 
| 391 |  | int             i, o; | 
| 454 |  | BSDF_value(dp,i,o) = .0f; | 
| 455 |  | } | 
| 456 |  | } | 
| 457 | < | if (hemi_total > 1.02) { | 
| 457 | > | if (hemi_total > 1.01) { | 
| 458 |  | sprintf(errmsg, | 
| 459 |  | "incoming BSDF direction %d passes %.1f%% of light", | 
| 460 |  | i, 100.*hemi_total); | 
| 465 |  | sprintf(errmsg, "%d negative BSDF values (ignored)", nneg); | 
| 466 |  | error(WARNING, errmsg); | 
| 467 |  | } | 
| 468 | < | /* reverse roles and check again */ | 
| 468 | > | full_total = .0;                /* reverse roles and check again */ | 
| 469 |  | for (o = 0; o < dp->nout; o++) { | 
| 470 |  | hemi_total = .0; | 
| 471 |  | for (i = dp->ninc; i--; ) | 
| 472 |  | hemi_total += BSDF_value(dp,i,o) * omega_iarr[i]; | 
| 473 |  |  | 
| 474 | < | if (hemi_total > 1.02) { | 
| 474 | > | if (hemi_total > 1.01) { | 
| 475 |  | sprintf(errmsg, | 
| 476 |  | "outgoing BSDF direction %d collects %.1f%% of light", | 
| 477 |  | o, 100.*hemi_total); | 
| 478 |  | error(WARNING, errmsg); | 
| 479 |  | } | 
| 480 | + | full_total += hemi_total*omega_oarr[o]; | 
| 481 |  | } | 
| 482 | + | full_total /= PI; | 
| 483 | + | if (full_total > 1.00001) { | 
| 484 | + | sprintf(errmsg, "BSDF transfers %.4f%% of light", | 
| 485 | + | 100.*full_total); | 
| 486 | + | error(WARNING, errmsg); | 
| 487 | + | } | 
| 488 |  | free(omega_iarr); free(omega_oarr); | 
| 489 |  | return(1); | 
| 490 |  | } | 
| 491 |  |  | 
| 492 | + |  | 
| 493 |  | struct BSDF_data * | 
| 494 |  | load_BSDF(              /* load BSDF data from file */ | 
| 495 |  | char *fname | 
| 526 |  | return(NULL); | 
| 527 |  | } | 
| 528 |  | wtl = ezxml_child(ezxml_child(fl, "Optical"), "Layer"); | 
| 529 | + | if (strcasecmp(ezxml_txt(ezxml_child(ezxml_child(wtl, | 
| 530 | + | "DataDefinition"), "IncidentDataStructure")), | 
| 531 | + | "Columns")) { | 
| 532 | + | sprintf(errmsg, | 
| 533 | + | "BSDF \"%s\": unsupported IncidentDataStructure", | 
| 534 | + | path); | 
| 535 | + | error(WARNING, errmsg); | 
| 536 | + | ezxml_free(fl); | 
| 537 | + | return(NULL); | 
| 538 | + | } | 
| 539 |  | load_angle_basis(ezxml_child(ezxml_child(wtl, | 
| 540 |  | "DataDefinition"), "AngleBasis")); | 
| 541 |  | dp = (struct BSDF_data *)calloc(1, sizeof(struct BSDF_data)); | 
| 542 | + | load_geometry(dp, ezxml_child(wtl, "Material")); | 
| 543 |  | for (wld = ezxml_child(wtl, "WavelengthData"); | 
| 544 |  | wld != NULL; wld = wld->next) { | 
| 545 | < | if (strcmp(ezxml_txt(ezxml_child(wld,"Wavelength")), "Visible")) | 
| 545 | > | if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")), "Visible")) | 
| 546 |  | continue; | 
| 547 |  | wdb = ezxml_child(wld, "WavelengthDataBlock"); | 
| 548 |  | if (wdb == NULL) continue; | 
| 549 | < | if (strcmp(ezxml_txt(ezxml_child(wdb,"WavelengthDataDirection")), | 
| 549 | > | if (strcasecmp(ezxml_txt(ezxml_child(wdb,"WavelengthDataDirection")), | 
| 550 |  | "Transmission Front")) | 
| 551 |  | continue; | 
| 552 |  | load_bsdf_data(dp, wdb);        /* load front BTDF */ | 
| 570 |  | { | 
| 571 |  | if (b == NULL) | 
| 572 |  | return; | 
| 573 | + | if (b->mgf != NULL) | 
| 574 | + | free(b->mgf); | 
| 575 |  | if (b->bsdf != NULL) | 
| 576 |  | free(b->bsdf); | 
| 577 |  | free(b); | 
| 678 |  | getBSDF_xfm(            /* compute BSDF orient. -> world orient. transform */ | 
| 679 |  | MAT4 xm, | 
| 680 |  | FVECT nrm, | 
| 681 | < | UpDir ud | 
| 681 | > | UpDir ud, | 
| 682 | > | char *xfbuf | 
| 683 |  | ) | 
| 684 |  | { | 
| 685 |  | char    *xfargs[7]; | 
| 686 |  | XF      myxf; | 
| 687 |  | FVECT   updir, xdest, ydest; | 
| 688 | + | int     i; | 
| 689 |  |  | 
| 690 |  | updir[0] = updir[1] = updir[2] = 0.; | 
| 691 |  | switch (ud) { | 
| 716 |  | fcross(ydest, nrm, xdest); | 
| 717 |  | xf(&myxf, addrot(xfargs, xdest, ydest, nrm), xfargs); | 
| 718 |  | copymat4(xm, myxf.xfm); | 
| 719 | + | if (xfbuf == NULL) | 
| 720 | + | return(1); | 
| 721 | + | /* return xf arguments as well */ | 
| 722 | + | for (i = 0; xfargs[i] != NULL; i++) { | 
| 723 | + | *xfbuf++ = ' '; | 
| 724 | + | strcpy(xfbuf, xfargs[i]); | 
| 725 | + | while (*xfbuf) ++xfbuf; | 
| 726 | + | } | 
| 727 |  | return(1); | 
| 728 |  | } |