21 |
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#include "hilbert.h" |
22 |
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|
23 |
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/* Callback function type for SDtraverseTre() */ |
24 |
< |
typedef int SDtreCallback(float val, const double *cmin, |
25 |
< |
double csiz, void *cptr); |
26 |
< |
|
24 |
> |
typedef int SDtreCallback(float val, const double *cmin, double csiz, |
25 |
> |
void *cptr); |
26 |
|
/* reference width maximum (1.0) */ |
27 |
|
static const unsigned iwbits = sizeof(unsigned)*4; |
28 |
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static const unsigned iwmax = 1<<(sizeof(unsigned)*4); |
32 |
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static const FVECT zvec = {.0, .0, 1.}; |
33 |
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/* quantization value */ |
34 |
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static double quantum = 1./256.; |
35 |
+ |
/* our RGB primaries */ |
36 |
+ |
static C_COLOR tt_RGB_prim[3]; |
37 |
+ |
static float tt_RGB_coef[3]; |
38 |
|
|
39 |
+ |
static const double czero[SD_MAXDIM]; |
40 |
+ |
|
41 |
+ |
enum {tt_Y, tt_u, tt_v}; /* tree components (tt_Y==0) */ |
42 |
+ |
|
43 |
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/* Struct used for our distribution-building callback */ |
44 |
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typedef struct { |
45 |
|
short nic; /* number of input coordinates */ |
114 |
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|
115 |
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if (sdt == NULL) |
116 |
|
return; |
117 |
< |
SDfreeTre(sdt->st); |
117 |
> |
SDfreeTre(sdt->stc[tt_Y]); |
118 |
> |
SDfreeTre(sdt->stc[tt_u]); |
119 |
> |
SDfreeTre(sdt->stc[tt_v]); |
120 |
|
free(sdt); |
121 |
|
} |
122 |
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|
179 |
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return st; |
180 |
|
} |
181 |
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|
182 |
+ |
/* Assign the given voxel in tree (produces no grid nodes) */ |
183 |
+ |
static SDNode * |
184 |
+ |
SDsetVoxel(SDNode *sroot, int nd, const double *tmin, const double tsiz, float val) |
185 |
+ |
{ |
186 |
+ |
double ctrk[SD_MAXDIM]; |
187 |
+ |
double csiz = 1.; |
188 |
+ |
SDNode *st; |
189 |
+ |
int i, n; |
190 |
+ |
/* check arguments */ |
191 |
+ |
for (i = nd; i-- > 0; ) |
192 |
+ |
if ((tmin[i] < .0) | (tmin[i] >= 1.-FTINY)) |
193 |
+ |
break; |
194 |
+ |
if ((i >= 0) | (nd <= 0) | (tsiz <= FTINY) | (tsiz > 1.+FTINY) | |
195 |
+ |
(sroot != NULL && sroot->ndim != nd)) { |
196 |
+ |
SDfreeTre(sroot); |
197 |
+ |
return NULL; |
198 |
+ |
} |
199 |
+ |
if (tsiz >= 1.-FTINY) { /* special case when tree is a leaf */ |
200 |
+ |
SDfreeTre(sroot); |
201 |
+ |
if ((sroot = SDnewNode(nd, 0)) != NULL) |
202 |
+ |
sroot->u.v[0] = val; |
203 |
+ |
return sroot; |
204 |
+ |
} |
205 |
+ |
/* make sure we have branching root */ |
206 |
+ |
if (sroot != NULL && sroot->log2GR >= 0) { |
207 |
+ |
SDfreeTre(sroot); sroot = NULL; |
208 |
+ |
} |
209 |
+ |
if (sroot == NULL && (sroot = SDnewNode(nd, -1)) == NULL) |
210 |
+ |
return NULL; |
211 |
+ |
st = sroot; /* climb/grow tree */ |
212 |
+ |
memset(ctrk, 0, sizeof(ctrk)); |
213 |
+ |
for ( ; ; ) { |
214 |
+ |
csiz *= .5; /* find appropriate branch */ |
215 |
+ |
n = 0; |
216 |
+ |
for (i = nd; i--; ) |
217 |
+ |
if (ctrk[i]+csiz <= tmin[i]+FTINY) { |
218 |
+ |
ctrk[i] += csiz; |
219 |
+ |
n |= 1 << i; |
220 |
+ |
} |
221 |
+ |
/* reached desired voxel? */ |
222 |
+ |
if (csiz <= tsiz+FTINY) { |
223 |
+ |
SDfreeTre(st->u.t[n]); |
224 |
+ |
st = st->u.t[n] = SDnewNode(nd, 0); |
225 |
+ |
break; |
226 |
+ |
} |
227 |
+ |
/* else grow tree as needed */ |
228 |
+ |
if (st->u.t[n] != NULL && st->u.t[n]->log2GR >= 0) { |
229 |
+ |
SDfreeTre(st->u.t[n]); st->u.t[n] = NULL; |
230 |
+ |
} |
231 |
+ |
if (st->u.t[n] == NULL) |
232 |
+ |
st->u.t[n] = SDnewNode(nd, -1); |
233 |
+ |
if ((st = st->u.t[n]) == NULL) |
234 |
+ |
break; |
235 |
+ |
} |
236 |
+ |
if (st == NULL) { |
237 |
+ |
SDfreeTre(sroot); |
238 |
+ |
return NULL; |
239 |
+ |
} |
240 |
+ |
st->u.v[0] = val; /* assign leaf and return root */ |
241 |
+ |
return sroot; |
242 |
+ |
} |
243 |
+ |
|
244 |
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/* Find smallest leaf in tree */ |
245 |
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static double |
246 |
|
SDsmallestLeaf(const SDNode *st) |
349 |
|
int rv, rval = 0; |
350 |
|
double bmin[SD_MAXDIM]; |
351 |
|
int i, n; |
352 |
+ |
/* paranoia */ |
353 |
+ |
if (st == NULL) |
354 |
+ |
return 0; |
355 |
|
/* in branches? */ |
356 |
|
if (st->log2GR < 0) { |
357 |
|
unsigned skipmask = 0; |
358 |
|
csiz *= .5; |
359 |
|
for (i = st->ndim; i--; ) |
360 |
< |
if (1<<i & cmask) |
360 |
> |
if (1<<i & cmask) { |
361 |
|
if (pos[i] < cmin[i] + csiz) |
362 |
|
for (n = 1 << st->ndim; n--; ) { |
363 |
|
if (n & 1<<i) |
368 |
|
if (!(n & 1<<i)) |
369 |
|
skipmask |= 1<<n; |
370 |
|
} |
371 |
+ |
} |
372 |
|
for (n = 1 << st->ndim; n--; ) { |
373 |
|
if (1<<n & skipmask) |
374 |
|
continue; |
450 |
|
SDtraverseTre(const SDNode *st, const double *pos, int cmask, |
451 |
|
SDtreCallback *cf, void *cptr) |
452 |
|
{ |
379 |
– |
static double czero[SD_MAXDIM]; |
453 |
|
int i; |
454 |
|
/* check arguments */ |
455 |
|
if ((st == NULL) | (cf == NULL)) |
474 |
|
hcube[i] = .0; |
475 |
|
} |
476 |
|
/* climb the tree */ |
477 |
< |
while (st->log2GR < 0) { |
477 |
> |
while (st != NULL && st->log2GR < 0) { |
478 |
|
n = 0; /* move to appropriate branch */ |
479 |
|
if (hcube) hcube[st->ndim] *= .5; |
480 |
|
for (i = st->ndim; i--; ) { |
487 |
|
st = st->u.t[n]; /* avoids tail recursion */ |
488 |
|
pos = spos; |
489 |
|
} |
490 |
+ |
if (st == NULL) /* should never happen? */ |
491 |
+ |
return .0; |
492 |
|
if (st->log2GR == 0) /* short cut */ |
493 |
|
return st->u.v[0]; |
494 |
|
n = t = 0; /* find grid array index */ |
504 |
|
return st->u.v[n]; /* no interpolation */ |
505 |
|
} |
506 |
|
|
507 |
+ |
/* Convert CIE (Y,u',v') color to our RGB */ |
508 |
+ |
static void |
509 |
+ |
SDyuv2rgb(double yval, double uprime, double vprime, float rgb[3]) |
510 |
+ |
{ |
511 |
+ |
const double dfact = 1./(6.*uprime - 16.*vprime + 12.); |
512 |
+ |
C_COLOR cxy; |
513 |
+ |
|
514 |
+ |
c_cset(&cxy, 9.*uprime*dfact, 4.*vprime*dfact); |
515 |
+ |
c_toSharpRGB(&cxy, yval, rgb); |
516 |
+ |
} |
517 |
+ |
|
518 |
|
/* Query BSDF value and sample hypercube for the given vectors */ |
519 |
< |
static float |
520 |
< |
SDqueryTre(const SDTre *sdt, const FVECT outVec, const FVECT inVec, double *hc) |
519 |
> |
static int |
520 |
> |
SDqueryTre(const SDTre *sdt, float *coef, |
521 |
> |
const FVECT outVec, const FVECT inVec, double *hc) |
522 |
|
{ |
523 |
|
const RREAL *vtmp; |
524 |
+ |
float yval; |
525 |
|
FVECT rOutVec; |
526 |
|
double gridPos[4]; |
527 |
|
|
528 |
+ |
if (sdt->stc[tt_Y] == NULL) /* paranoia, I hope */ |
529 |
+ |
return 0; |
530 |
+ |
|
531 |
|
switch (sdt->sidef) { /* whose side are you on? */ |
532 |
|
case SD_FREFL: |
533 |
|
if ((outVec[2] < 0) | (inVec[2] < 0)) |
534 |
< |
return -1.; |
534 |
> |
return 0; |
535 |
|
break; |
536 |
|
case SD_BREFL: |
537 |
|
if ((outVec[2] > 0) | (inVec[2] > 0)) |
538 |
< |
return -1.; |
538 |
> |
return 0; |
539 |
|
break; |
540 |
|
case SD_FXMIT: |
541 |
|
if (outVec[2] > 0) { |
542 |
|
if (inVec[2] > 0) |
543 |
< |
return -1.; |
543 |
> |
return 0; |
544 |
|
vtmp = outVec; outVec = inVec; inVec = vtmp; |
545 |
|
} else if (inVec[2] < 0) |
546 |
< |
return -1.; |
546 |
> |
return 0; |
547 |
|
break; |
548 |
|
case SD_BXMIT: |
549 |
|
if (inVec[2] > 0) { |
550 |
|
if (outVec[2] > 0) |
551 |
< |
return -1.; |
551 |
> |
return 0; |
552 |
|
vtmp = outVec; outVec = inVec; inVec = vtmp; |
553 |
|
} else if (outVec[2] < 0) |
554 |
< |
return -1.; |
554 |
> |
return 0; |
555 |
|
break; |
556 |
|
default: |
557 |
< |
return -1.; |
557 |
> |
return 0; |
558 |
|
} |
559 |
|
/* convert vector coordinates */ |
560 |
< |
if (sdt->st->ndim == 3) { |
560 |
> |
if (sdt->stc[tt_Y]->ndim == 3) { |
561 |
|
spinvector(rOutVec, outVec, zvec, -atan2(-inVec[1],-inVec[0])); |
562 |
< |
gridPos[0] = .5 - .5*sqrt(inVec[0]*inVec[0] + inVec[1]*inVec[1]); |
562 |
> |
gridPos[0] = (.5-FTINY) - |
563 |
> |
.5*sqrt(inVec[0]*inVec[0] + inVec[1]*inVec[1]); |
564 |
|
SDdisk2square(gridPos+1, rOutVec[0], rOutVec[1]); |
565 |
< |
} else if (sdt->st->ndim == 4) { |
565 |
> |
} else if (sdt->stc[tt_Y]->ndim == 4) { |
566 |
|
SDdisk2square(gridPos, -inVec[0], -inVec[1]); |
567 |
|
SDdisk2square(gridPos+2, outVec[0], outVec[1]); |
568 |
|
} else |
569 |
< |
return -1.; /* should be internal error */ |
570 |
< |
|
571 |
< |
return SDlookupTre(sdt->st, gridPos, hc); |
569 |
> |
return 0; /* should be internal error */ |
570 |
> |
/* get BSDF value */ |
571 |
> |
yval = SDlookupTre(sdt->stc[tt_Y], gridPos, hc); |
572 |
> |
if (coef == NULL) /* just getting hypercube? */ |
573 |
> |
return 1; |
574 |
> |
if (sdt->stc[tt_u] == NULL || sdt->stc[tt_v] == NULL) { |
575 |
> |
*coef = yval; |
576 |
> |
return 1; /* no color */ |
577 |
> |
} |
578 |
> |
/* else decode color */ |
579 |
> |
SDyuv2rgb(yval, SDlookupTre(sdt->stc[tt_u], gridPos, NULL), |
580 |
> |
SDlookupTre(sdt->stc[tt_v], gridPos, NULL), coef); |
581 |
> |
coef[0] *= tt_RGB_coef[0]; |
582 |
> |
coef[1] *= tt_RGB_coef[1]; |
583 |
> |
coef[2] *= tt_RGB_coef[2]; |
584 |
> |
return 3; |
585 |
|
} |
586 |
|
|
587 |
|
/* Compute non-diffuse component for variable-resolution BSDF */ |
594 |
|
|| sdc->dist == NULL) |
595 |
|
return 0; |
596 |
|
/* get nearest BSDF value */ |
597 |
< |
coef[0] = SDqueryTre((SDTre *)sdc->dist, outVec, inVec, NULL); |
493 |
< |
return (coef[0] >= 0); /* monochromatic for now */ |
597 |
> |
return SDqueryTre((SDTre *)sdc->dist, coef, outVec, inVec, NULL); |
598 |
|
} |
599 |
|
|
600 |
|
/* Callback to build cumulative distribution using SDtraverseTre() */ |
603 |
|
{ |
604 |
|
SDdistScaffold *sp = (SDdistScaffold *)cptr; |
605 |
|
int wid = csiz*(double)iwmax + .5; |
606 |
+ |
double revcmin[2]; |
607 |
|
bitmask_t bmin[2], bmax[2]; |
608 |
|
|
609 |
< |
cmin += sp->nic * !sp->rev; /* skip to output coords */ |
609 |
> |
if (sp->rev) { /* need to reverse sense? */ |
610 |
> |
revcmin[0] = 1. - cmin[0] - csiz; |
611 |
> |
revcmin[1] = 1. - cmin[1] - csiz; |
612 |
> |
cmin = revcmin; |
613 |
> |
} else { |
614 |
> |
cmin += sp->nic; /* else skip to output coords */ |
615 |
> |
} |
616 |
|
if (wid < sp->wmin) /* new minimum width? */ |
617 |
|
sp->wmin = wid; |
618 |
|
if (wid > sp->wmax) /* new maximum? */ |
619 |
|
sp->wmax = wid; |
620 |
|
if (sp->alen >= sp->nall) { /* need more space? */ |
621 |
|
struct outdir_s *ndarr; |
622 |
< |
sp->nall += 1024; |
622 |
> |
sp->nall = (int)(1.5*sp->nall) + 256; |
623 |
|
ndarr = (struct outdir_s *)realloc(sp->darr, |
624 |
|
sizeof(struct outdir_s)*sp->nall); |
625 |
|
if (ndarr == NULL) { |
670 |
|
/* initialize scaffold */ |
671 |
|
myScaffold.wmin = iwmax; |
672 |
|
myScaffold.wmax = 0; |
673 |
< |
myScaffold.nic = sdt->st->ndim - 2; |
673 |
> |
myScaffold.nic = sdt->stc[tt_Y]->ndim - 2; |
674 |
|
myScaffold.rev = rev; |
675 |
|
myScaffold.alen = 0; |
676 |
|
myScaffold.nall = 512; |
684 |
|
pos[i+2*rev] = invec[i]; |
685 |
|
cmask <<= 2*rev; |
686 |
|
/* grow the distribution */ |
687 |
< |
if (SDtraverseTre(sdt->st, pos, cmask, |
688 |
< |
&build_scaffold, &myScaffold) < 0) { |
687 |
> |
if (SDtraverseTre(sdt->stc[tt_Y], pos, cmask, |
688 |
> |
build_scaffold, &myScaffold) < 0) { |
689 |
|
free(myScaffold.darr); |
690 |
|
return NULL; |
691 |
|
} |
702 |
|
cd->isodist = (myScaffold.nic == 1); |
703 |
|
/* sort the distribution */ |
704 |
|
qsort(myScaffold.darr, cd->calen = myScaffold.alen, |
705 |
< |
sizeof(struct outdir_s), &sscmp); |
705 |
> |
sizeof(struct outdir_s), sscmp); |
706 |
|
|
707 |
|
/* record input range */ |
708 |
|
scale = myScaffold.wmin / (double)iwmax; |
709 |
|
for (i = myScaffold.nic; i--; ) { |
710 |
< |
cd->clim[i][0] = floor(pos[i]/scale) * scale; |
710 |
> |
cd->clim[i][0] = floor(pos[i+2*rev]/scale) * scale; |
711 |
|
cd->clim[i][1] = cd->clim[i][0] + scale; |
712 |
|
} |
713 |
|
if (cd->isodist) { /* avoid issue in SDqueryTreProjSA() */ |
773 |
|
default: |
774 |
|
return NULL; |
775 |
|
} |
776 |
< |
if (sdt->st->ndim == 3) { /* isotropic BSDF? */ |
776 |
> |
if (sdt->stc[tt_Y]->ndim == 3) { /* isotropic BSDF? */ |
777 |
|
if (mode != sdt->sidef) /* XXX unhandled reciprocity */ |
778 |
|
return &SDemptyCD; |
779 |
< |
inCoord[0] = .5 - .5*sqrt(inVec[0]*inVec[0] + inVec[1]*inVec[1]); |
780 |
< |
} else if (sdt->st->ndim == 4) { |
781 |
< |
SDdisk2square(inCoord, -inVec[0], -inVec[1]); |
779 |
> |
inCoord[0] = (.5-FTINY) - |
780 |
> |
.5*sqrt(inVec[0]*inVec[0] + inVec[1]*inVec[1]); |
781 |
> |
} else if (sdt->stc[tt_Y]->ndim == 4) { |
782 |
> |
if (mode != sdt->sidef) /* use reciprocity? */ |
783 |
> |
SDdisk2square(inCoord, inVec[0], inVec[1]); |
784 |
> |
else |
785 |
> |
SDdisk2square(inCoord, -inVec[0], -inVec[1]); |
786 |
|
} else |
787 |
|
return NULL; /* should be internal error */ |
788 |
|
/* quantize to avoid f.p. errors */ |
789 |
< |
for (i = sdt->st->ndim - 2; i--; ) |
789 |
> |
for (i = sdt->stc[tt_Y]->ndim - 2; i--; ) |
790 |
|
inCoord[i] = floor(inCoord[i]/quantum)*quantum + .5*quantum; |
791 |
|
cdlast = NULL; /* check for direction in cache list */ |
792 |
+ |
/* PLACE MUTEX LOCK HERE FOR THREAD-SAFE */ |
793 |
|
for (cd = (SDTreCDst *)sdc->cdList; cd != NULL; |
794 |
|
cdlast = cd, cd = cd->next) { |
795 |
|
if (cd->sidef != mode) |
796 |
|
continue; |
797 |
< |
for (i = sdt->st->ndim - 2; i--; ) |
797 |
> |
for (i = sdt->stc[tt_Y]->ndim - 2; i--; ) |
798 |
|
if ((cd->clim[i][0] > inCoord[i]) | |
799 |
|
(inCoord[i] >= cd->clim[i][1])) |
800 |
|
break; |
808 |
|
cd->next = (SDTreCDst *)sdc->cdList; |
809 |
|
sdc->cdList = (SDCDst *)cd; |
810 |
|
} |
811 |
+ |
/* END MUTEX LOCK */ |
812 |
|
return (SDCDst *)cd; /* ready to go */ |
813 |
|
} |
814 |
|
|
825 |
|
/* get projected solid angle(s) */ |
826 |
|
if (v2 != NULL) { |
827 |
|
const SDTre *sdt = (SDTre *)sdc->dist; |
828 |
< |
double hcube[SD_MAXDIM]; |
829 |
< |
if (SDqueryTre(sdt, v1, v2, hcube) < 0) { |
828 |
> |
double hcube[SD_MAXDIM+1]; |
829 |
> |
if (!SDqueryTre(sdt, NULL, v1, v2, hcube)) { |
830 |
|
strcpy(SDerrorDetail, "Bad call to SDqueryTreProjSA"); |
831 |
|
return SDEinternal; |
832 |
|
} |
833 |
< |
myPSA[0] = hcube[sdt->st->ndim]; |
833 |
> |
myPSA[0] = hcube[sdt->stc[tt_Y]->ndim]; |
834 |
|
myPSA[1] = myPSA[0] *= myPSA[0] * M_PI; |
835 |
|
} else { |
836 |
|
const SDTreCDst *cd = (const SDTreCDst *)SDgetTreCDist(v1, sdc); |
837 |
|
if (cd == NULL) |
838 |
< |
return SDEmemory; |
839 |
< |
myPSA[0] = M_PI * (cd->clim[0][1] - cd->clim[0][0]) * |
840 |
< |
(cd->clim[1][1] - cd->clim[1][0]); |
841 |
< |
myPSA[1] = cd->max_psa; |
838 |
> |
myPSA[0] = myPSA[1] = 0; |
839 |
> |
else { |
840 |
> |
myPSA[0] = M_PI * (cd->clim[0][1] - cd->clim[0][0]) * |
841 |
> |
(cd->clim[1][1] - cd->clim[1][0]); |
842 |
> |
myPSA[1] = cd->max_psa; |
843 |
> |
} |
844 |
|
} |
845 |
|
switch (qflags) { /* record based on flag settings */ |
846 |
|
case SDqueryVal: |
855 |
|
psa[1] = myPSA[1]; |
856 |
|
/* fall through */ |
857 |
|
case SDqueryMin: |
858 |
< |
if (myPSA[0] < psa[0]) |
858 |
> |
if ((myPSA[0] > 0) & (myPSA[0] < psa[0])) |
859 |
|
psa[0] = myPSA[0]; |
860 |
|
break; |
861 |
|
} |
904 |
|
SDsquare2disk(gpos, gpos[0], gpos[1]); |
905 |
|
/* compute Z-coordinate */ |
906 |
|
gpos[2] = 1. - gpos[0]*gpos[0] - gpos[1]*gpos[1]; |
907 |
< |
if (gpos[2] > 0) /* paranoia, I hope */ |
789 |
< |
gpos[2] = sqrt(gpos[2]); |
907 |
> |
gpos[2] = sqrt(gpos[2]*(gpos[2]>0)); |
908 |
|
/* emit from back? */ |
909 |
|
if ((cd->sidef == SD_BREFL) | (cd->sidef == SD_FXMIT)) |
910 |
|
gpos[2] = -gpos[2]; |
911 |
< |
if (cd->isodist) { /* rotate isotropic result */ |
911 |
> |
if (cd->isodist) { /* rotate isotropic sample */ |
912 |
|
rotangle = atan2(-ioVec[1],-ioVec[0]); |
913 |
< |
VCOPY(ioVec, gpos); |
796 |
< |
spinvector(ioVec, ioVec, zvec, rotangle); |
913 |
> |
spinvector(ioVec, gpos, zvec, rotangle); |
914 |
|
} else |
915 |
|
VCOPY(ioVec, gpos); |
916 |
|
return SDEnone; |
926 |
|
} |
927 |
|
|
928 |
|
/* Advance pointer past matching token (or any token if c==0) */ |
929 |
< |
#define eat_token(spp,c) (next_token(spp)==(c) ^ !(c) ? *(*(spp))++ : 0) |
929 |
> |
#define eat_token(spp,c) ((next_token(spp)==(c)) ^ !(c) ? *(*(spp))++ : 0) |
930 |
|
|
931 |
|
/* Count words from this point in string to '}' */ |
932 |
|
static int |
952 |
|
char *svnext; |
953 |
|
|
954 |
|
while (n-- > 0 && (svnext = fskip(*spp)) != NULL) { |
955 |
< |
*v++ = atof(*spp); |
955 |
> |
if ((*v++ = atof(*spp)) < 0) |
956 |
> |
v[-1] = 0; |
957 |
|
*spp = svnext; |
958 |
|
eat_token(spp, ','); |
959 |
|
} |
1012 |
|
static SDError |
1013 |
|
get_extrema(SDSpectralDF *df) |
1014 |
|
{ |
1015 |
< |
SDNode *st = (*(SDTre *)df->comp[0].dist).st; |
1015 |
> |
SDNode *st = (*(SDTre *)df->comp[0].dist).stc[tt_Y]; |
1016 |
|
double stepWidth, dhemi, bmin[4], bmax[4]; |
1017 |
|
|
1018 |
|
stepWidth = SDsmallestLeaf(st); |
1052 |
|
|
1053 |
|
/* Load BSDF distribution for this wavelength */ |
1054 |
|
static SDError |
1055 |
< |
load_bsdf_data(SDData *sd, ezxml_t wdb, int ndim) |
1055 |
> |
load_bsdf_data(SDData *sd, ezxml_t wdb, int ct, int ndim) |
1056 |
|
{ |
1057 |
|
SDSpectralDF *df; |
1058 |
|
SDTre *sdt; |
1065 |
|
* Remember that front and back are reversed from WINDOW 6 orientations |
1066 |
|
*/ |
1067 |
|
if (!strcasecmp(sdata, "Transmission Front")) { |
1068 |
< |
if (sd->tf != NULL) |
951 |
< |
SDfreeSpectralDF(sd->tf); |
952 |
< |
if ((sd->tf = SDnewSpectralDF(1)) == NULL) |
1068 |
> |
if (sd->tb == NULL && (sd->tb = SDnewSpectralDF(1)) == NULL) |
1069 |
|
return SDEmemory; |
1070 |
< |
df = sd->tf; |
1070 |
> |
df = sd->tb; |
1071 |
|
} else if (!strcasecmp(sdata, "Transmission Back")) { |
1072 |
< |
if (sd->tb != NULL) |
957 |
< |
SDfreeSpectralDF(sd->tb); |
958 |
< |
if ((sd->tb = SDnewSpectralDF(1)) == NULL) |
1072 |
> |
if (sd->tf == NULL && (sd->tf = SDnewSpectralDF(1)) == NULL) |
1073 |
|
return SDEmemory; |
1074 |
< |
df = sd->tb; |
1074 |
> |
df = sd->tf; |
1075 |
|
} else if (!strcasecmp(sdata, "Reflection Front")) { |
1076 |
< |
if (sd->rb != NULL) /* note back-front reversal */ |
963 |
< |
SDfreeSpectralDF(sd->rb); |
964 |
< |
if ((sd->rb = SDnewSpectralDF(1)) == NULL) |
1076 |
> |
if (sd->rb == NULL && (sd->rb = SDnewSpectralDF(1)) == NULL) |
1077 |
|
return SDEmemory; |
1078 |
|
df = sd->rb; |
1079 |
|
} else if (!strcasecmp(sdata, "Reflection Back")) { |
1080 |
< |
if (sd->rf != NULL) /* note front-back reversal */ |
969 |
< |
SDfreeSpectralDF(sd->rf); |
970 |
< |
if ((sd->rf = SDnewSpectralDF(1)) == NULL) |
1080 |
> |
if (sd->rf == NULL && (sd->rf = SDnewSpectralDF(1)) == NULL) |
1081 |
|
return SDEmemory; |
1082 |
|
df = sd->rf; |
1083 |
|
} else |
1084 |
|
return SDEnone; |
975 |
– |
/* XXX should also check "ScatteringDataType" for consistency? */ |
1085 |
|
/* get angle bases */ |
1086 |
|
sdata = ezxml_txt(ezxml_child(wdb,"AngleBasis")); |
1087 |
|
if (!sdata || strcasecmp(sdata, "LBNL/Shirley-Chiu")) { |
1089 |
|
!sdata ? "Missing" : "Unsupported", sd->name); |
1090 |
|
return !sdata ? SDEformat : SDEsupport; |
1091 |
|
} |
1092 |
< |
/* allocate BSDF tree */ |
1093 |
< |
sdt = (SDTre *)malloc(sizeof(SDTre)); |
1094 |
< |
if (sdt == NULL) |
1095 |
< |
return SDEmemory; |
1096 |
< |
if (df == sd->rf) |
1097 |
< |
sdt->sidef = SD_FREFL; |
1098 |
< |
else if (df == sd->rb) |
1099 |
< |
sdt->sidef = SD_BREFL; |
1100 |
< |
else if (df == sd->tf) |
1101 |
< |
sdt->sidef = SD_FXMIT; |
1102 |
< |
else /* df == sd->tb */ |
1103 |
< |
sdt->sidef = SD_BXMIT; |
1104 |
< |
sdt->st = NULL; |
1105 |
< |
df->comp[0].cspec[0] = c_dfcolor; /* XXX monochrome for now */ |
1106 |
< |
df->comp[0].dist = sdt; |
1107 |
< |
df->comp[0].func = &SDhandleTre; |
1092 |
> |
if (df->comp[0].dist == NULL) { /* need to allocate BSDF tree? */ |
1093 |
> |
sdt = (SDTre *)malloc(sizeof(SDTre)); |
1094 |
> |
if (sdt == NULL) |
1095 |
> |
return SDEmemory; |
1096 |
> |
if (df == sd->rf) |
1097 |
> |
sdt->sidef = SD_FREFL; |
1098 |
> |
else if (df == sd->rb) |
1099 |
> |
sdt->sidef = SD_BREFL; |
1100 |
> |
else if (df == sd->tf) |
1101 |
> |
sdt->sidef = SD_FXMIT; |
1102 |
> |
else /* df == sd->tb */ |
1103 |
> |
sdt->sidef = SD_BXMIT; |
1104 |
> |
sdt->stc[tt_Y] = sdt->stc[tt_u] = sdt->stc[tt_v] = NULL; |
1105 |
> |
df->comp[0].dist = sdt; |
1106 |
> |
df->comp[0].func = &SDhandleTre; |
1107 |
> |
} else { |
1108 |
> |
sdt = (SDTre *)df->comp[0].dist; |
1109 |
> |
if (sdt->stc[ct] != NULL) { |
1110 |
> |
SDfreeTre(sdt->stc[ct]); |
1111 |
> |
sdt->stc[ct] = NULL; |
1112 |
> |
} |
1113 |
> |
} |
1114 |
|
/* read BSDF data */ |
1115 |
|
sdata = ezxml_txt(ezxml_child(wdb, "ScatteringData")); |
1116 |
|
if (!sdata || !next_token(&sdata)) { |
1118 |
|
sd->name); |
1119 |
|
return SDEformat; |
1120 |
|
} |
1121 |
< |
sdt->st = load_tree_data(&sdata, ndim); |
1122 |
< |
if (sdt->st == NULL) |
1121 |
> |
sdt->stc[ct] = load_tree_data(&sdata, ndim); |
1122 |
> |
if (sdt->stc[ct] == NULL) |
1123 |
|
return SDEformat; |
1124 |
|
if (next_token(&sdata)) { /* check for unconsumed characters */ |
1125 |
|
sprintf(SDerrorDetail, |
1128 |
|
return SDEformat; |
1129 |
|
} |
1130 |
|
/* flatten branches where possible */ |
1131 |
< |
sdt->st = SDsimplifyTre(sdt->st); |
1132 |
< |
if (sdt->st == NULL) |
1131 |
> |
sdt->stc[ct] = SDsimplifyTre(sdt->stc[ct]); |
1132 |
> |
if (sdt->stc[ct] == NULL) |
1133 |
|
return SDEinternal; |
1134 |
< |
return get_extrema(df); /* compute global quantities */ |
1134 |
> |
/* compute global quantities for Y */ |
1135 |
> |
return (ct == tt_Y) ? get_extrema(df) : SDEnone; |
1136 |
|
} |
1137 |
|
|
1138 |
|
/* Find minimum value in tree */ |
1172 |
|
} |
1173 |
|
} |
1174 |
|
|
1175 |
< |
/* Subtract minimum value from BSDF */ |
1175 |
> |
/* Subtract minimum Y value from BSDF */ |
1176 |
|
static double |
1177 |
< |
subtract_min(SDNode *st) |
1177 |
> |
subtract_min_Y(SDNode *st) |
1178 |
|
{ |
1179 |
|
float vmin; |
1180 |
|
/* be sure to skip unused portion */ |
1196 |
|
} else /* anisotropic covers entire tree */ |
1197 |
|
vmin = SDgetTreMin(st); |
1198 |
|
|
1199 |
< |
if (vmin <= FTINY) |
1200 |
< |
return .0; |
1199 |
> |
if (vmin <= .01/M_PI) |
1200 |
> |
return .0; /* not worth bothering about */ |
1201 |
|
|
1202 |
|
SDsubtractTreVal(st, vmin); |
1203 |
|
|
1204 |
|
return M_PI * vmin; /* return hemispherical value */ |
1205 |
|
} |
1206 |
|
|
1207 |
+ |
/* Struct used in callback to find RGB extrema */ |
1208 |
+ |
typedef struct { |
1209 |
+ |
SDNode **stc; /* original Y, u' & v' trees */ |
1210 |
+ |
float rgb[3]; /* RGB value */ |
1211 |
+ |
SDNode *new_stu, *new_stv; /* replacement u' & v' trees */ |
1212 |
+ |
} SDextRGBs; |
1213 |
+ |
|
1214 |
+ |
/* Callback to find minimum RGB from Y value plus CIE (u',v') trees */ |
1215 |
+ |
static int |
1216 |
+ |
get_min_RGB(float yval, const double *cmin, double csiz, void *cptr) |
1217 |
+ |
{ |
1218 |
+ |
SDextRGBs *mp = (SDextRGBs *)cptr; |
1219 |
+ |
double cmax[SD_MAXDIM]; |
1220 |
+ |
float rgb[3]; |
1221 |
+ |
|
1222 |
+ |
if (mp->stc[tt_Y]->ndim == 3) { |
1223 |
+ |
if (cmin[0] + .5*csiz >= .5) |
1224 |
+ |
return 0; /* ignore dead half of isotropic */ |
1225 |
+ |
} else |
1226 |
+ |
cmax[3] = cmin[3] + csiz; |
1227 |
+ |
cmax[0] = cmin[0] + csiz; |
1228 |
+ |
cmax[1] = cmin[1] + csiz; |
1229 |
+ |
cmax[2] = cmin[2] + csiz; |
1230 |
+ |
/* average RGB color over voxel */ |
1231 |
+ |
SDyuv2rgb(yval, SDavgTreBox(mp->stc[tt_u], cmin, cmax), |
1232 |
+ |
SDavgTreBox(mp->stc[tt_v], cmin, cmax), rgb); |
1233 |
+ |
/* track smallest components */ |
1234 |
+ |
if (rgb[0] < mp->rgb[0]) mp->rgb[0] = rgb[0]; |
1235 |
+ |
if (rgb[1] < mp->rgb[1]) mp->rgb[1] = rgb[1]; |
1236 |
+ |
if (rgb[2] < mp->rgb[2]) mp->rgb[2] = rgb[2]; |
1237 |
+ |
return 0; |
1238 |
+ |
} |
1239 |
+ |
|
1240 |
+ |
/* Callback to build adjusted u' tree */ |
1241 |
+ |
static int |
1242 |
+ |
adjust_utree(float uprime, const double *cmin, double csiz, void *cptr) |
1243 |
+ |
{ |
1244 |
+ |
SDextRGBs *mp = (SDextRGBs *)cptr; |
1245 |
+ |
double cmax[SD_MAXDIM]; |
1246 |
+ |
double yval; |
1247 |
+ |
float rgb[3]; |
1248 |
+ |
C_COLOR clr; |
1249 |
+ |
|
1250 |
+ |
if (mp->stc[tt_Y]->ndim == 3) { |
1251 |
+ |
if (cmin[0] + .5*csiz >= .5) |
1252 |
+ |
return 0; /* ignore dead half of isotropic */ |
1253 |
+ |
} else |
1254 |
+ |
cmax[3] = cmin[3] + csiz; |
1255 |
+ |
cmax[0] = cmin[0] + csiz; |
1256 |
+ |
cmax[1] = cmin[1] + csiz; |
1257 |
+ |
cmax[2] = cmin[2] + csiz; |
1258 |
+ |
/* average RGB color over voxel */ |
1259 |
+ |
SDyuv2rgb(yval=SDavgTreBox(mp->stc[tt_Y], cmin, cmax), uprime, |
1260 |
+ |
SDavgTreBox(mp->stc[tt_v], cmin, cmax), rgb); |
1261 |
+ |
/* subtract minimum (& clamp) */ |
1262 |
+ |
if ((rgb[0] -= mp->rgb[0]) < 1e-5*yval) rgb[0] = 1e-5*yval; |
1263 |
+ |
if ((rgb[1] -= mp->rgb[1]) < 1e-5*yval) rgb[1] = 1e-5*yval; |
1264 |
+ |
if ((rgb[2] -= mp->rgb[2]) < 1e-5*yval) rgb[2] = 1e-5*yval; |
1265 |
+ |
c_fromSharpRGB(rgb, &clr); /* compute new u' for adj. RGB */ |
1266 |
+ |
uprime = 4.*clr.cx/(-2.*clr.cx + 12.*clr.cy + 3.); |
1267 |
+ |
/* assign in new u' tree */ |
1268 |
+ |
mp->new_stu = SDsetVoxel(mp->new_stu, mp->stc[tt_Y]->ndim, |
1269 |
+ |
cmin, csiz, uprime); |
1270 |
+ |
return -(mp->new_stu == NULL); |
1271 |
+ |
} |
1272 |
+ |
|
1273 |
+ |
/* Callback to build adjusted v' tree */ |
1274 |
+ |
static int |
1275 |
+ |
adjust_vtree(float vprime, const double *cmin, double csiz, void *cptr) |
1276 |
+ |
{ |
1277 |
+ |
SDextRGBs *mp = (SDextRGBs *)cptr; |
1278 |
+ |
double cmax[SD_MAXDIM]; |
1279 |
+ |
double yval; |
1280 |
+ |
float rgb[3]; |
1281 |
+ |
C_COLOR clr; |
1282 |
+ |
|
1283 |
+ |
if (mp->stc[tt_Y]->ndim == 3) { |
1284 |
+ |
if (cmin[0] + .5*csiz >= .5) |
1285 |
+ |
return 0; /* ignore dead half of isotropic */ |
1286 |
+ |
} else |
1287 |
+ |
cmax[3] = cmin[3] + csiz; |
1288 |
+ |
cmax[0] = cmin[0] + csiz; |
1289 |
+ |
cmax[1] = cmin[1] + csiz; |
1290 |
+ |
cmax[2] = cmin[2] + csiz; |
1291 |
+ |
/* average RGB color over voxel */ |
1292 |
+ |
SDyuv2rgb(yval=SDavgTreBox(mp->stc[tt_Y], cmin, cmax), |
1293 |
+ |
SDavgTreBox(mp->stc[tt_u], cmin, cmax), |
1294 |
+ |
vprime, rgb); |
1295 |
+ |
/* subtract minimum (& clamp) */ |
1296 |
+ |
if ((rgb[0] -= mp->rgb[0]) < 1e-5*yval) rgb[0] = 1e-5*yval; |
1297 |
+ |
if ((rgb[1] -= mp->rgb[1]) < 1e-5*yval) rgb[1] = 1e-5*yval; |
1298 |
+ |
if ((rgb[2] -= mp->rgb[2]) < 1e-5*yval) rgb[2] = 1e-5*yval; |
1299 |
+ |
c_fromSharpRGB(rgb, &clr); /* compute new v' for adj. RGB */ |
1300 |
+ |
vprime = 9.*clr.cy/(-2.*clr.cx + 12.*clr.cy + 3.); |
1301 |
+ |
/* assign in new v' tree */ |
1302 |
+ |
mp->new_stv = SDsetVoxel(mp->new_stv, mp->stc[tt_Y]->ndim, |
1303 |
+ |
cmin, csiz, vprime); |
1304 |
+ |
return -(mp->new_stv == NULL); |
1305 |
+ |
} |
1306 |
+ |
|
1307 |
+ |
/* Subtract minimum (diffuse) color and return luminance & CIE (x,y) */ |
1308 |
+ |
static double |
1309 |
+ |
subtract_min_RGB(C_COLOR *cs, SDNode *stc[]) |
1310 |
+ |
{ |
1311 |
+ |
SDextRGBs my_min; |
1312 |
+ |
double ymin; |
1313 |
+ |
|
1314 |
+ |
my_min.stc = stc; |
1315 |
+ |
my_min.rgb[0] = my_min.rgb[1] = my_min.rgb[2] = FHUGE; |
1316 |
+ |
my_min.new_stu = my_min.new_stv = NULL; |
1317 |
+ |
/* get minimum RGB value */ |
1318 |
+ |
SDtraverseTre(stc[tt_Y], NULL, 0, get_min_RGB, &my_min); |
1319 |
+ |
/* convert to C_COLOR */ |
1320 |
+ |
ymin = c_fromSharpRGB(my_min.rgb, cs); |
1321 |
+ |
if (ymin <= .01/M_PI) /* not worth bothering about? */ |
1322 |
+ |
return .0; |
1323 |
+ |
/* adjust u' & v' trees */ |
1324 |
+ |
SDtraverseTre(stc[tt_u], NULL, 0, adjust_utree, &my_min); |
1325 |
+ |
SDtraverseTre(stc[tt_v], NULL, 0, adjust_vtree, &my_min); |
1326 |
+ |
SDfreeTre(stc[tt_u]); SDfreeTre(stc[tt_v]); |
1327 |
+ |
stc[tt_u] = SDsimplifyTre(my_min.new_stu); |
1328 |
+ |
stc[tt_v] = SDsimplifyTre(my_min.new_stv); |
1329 |
+ |
/* subtract Y & return hemispherical */ |
1330 |
+ |
SDsubtractTreVal(stc[tt_Y], ymin); |
1331 |
+ |
|
1332 |
+ |
return M_PI * ymin; |
1333 |
+ |
} |
1334 |
+ |
|
1335 |
|
/* Extract and separate diffuse portion of BSDF */ |
1336 |
|
static void |
1337 |
|
extract_diffuse(SDValue *dv, SDSpectralDF *df) |
1338 |
|
{ |
1339 |
|
int n; |
1340 |
+ |
SDTre *sdt; |
1341 |
|
|
1342 |
|
if (df == NULL || df->ncomp <= 0) { |
1343 |
|
dv->spec = c_dfcolor; |
1344 |
|
dv->cieY = .0; |
1345 |
|
return; |
1346 |
|
} |
1347 |
< |
dv->spec = df->comp[0].cspec[0]; |
1348 |
< |
dv->cieY = subtract_min((*(SDTre *)df->comp[0].dist).st); |
1349 |
< |
/* in case of multiple components */ |
1350 |
< |
for (n = df->ncomp; --n; ) { |
1351 |
< |
double ymin = subtract_min((*(SDTre *)df->comp[n].dist).st); |
1352 |
< |
c_cmix(&dv->spec, dv->cieY, &dv->spec, ymin, &df->comp[n].cspec[0]); |
1353 |
< |
dv->cieY += ymin; |
1347 |
> |
sdt = (SDTre *)df->comp[0].dist; |
1348 |
> |
/* subtract minimum color/grayscale */ |
1349 |
> |
if (sdt->stc[tt_u] != NULL && sdt->stc[tt_v] != NULL) { |
1350 |
> |
int i = 3*(tt_RGB_coef[1] < .001); |
1351 |
> |
while (i--) { /* initialize on first call */ |
1352 |
> |
float rgb[3]; |
1353 |
> |
rgb[0] = rgb[1] = rgb[2] = .0f; rgb[i] = 1.f; |
1354 |
> |
tt_RGB_coef[i] = c_fromSharpRGB(rgb, &tt_RGB_prim[i]); |
1355 |
> |
} |
1356 |
> |
memcpy(df->comp[0].cspec, tt_RGB_prim, sizeof(tt_RGB_prim)); |
1357 |
> |
dv->cieY = subtract_min_RGB(&dv->spec, sdt->stc); |
1358 |
> |
} else { |
1359 |
> |
df->comp[0].cspec[0] = dv->spec = c_dfcolor; |
1360 |
> |
dv->cieY = subtract_min_Y(sdt->stc[tt_Y]); |
1361 |
|
} |
1362 |
|
df->maxHemi -= dv->cieY; /* adjust maximum hemispherical */ |
1363 |
|
/* make sure everything is set */ |
1394 |
|
/* load BSDF components */ |
1395 |
|
for (wld = ezxml_child(wtl, "WavelengthData"); |
1396 |
|
wld != NULL; wld = wld->next) { |
1397 |
< |
if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")), |
1398 |
< |
"Visible")) |
1399 |
< |
continue; /* just visible for now */ |
1397 |
> |
const char *cnm = ezxml_txt(ezxml_child(wld,"Wavelength")); |
1398 |
> |
int ct = -1; |
1399 |
> |
if (!strcasecmp(cnm, "Visible")) |
1400 |
> |
ct = tt_Y; |
1401 |
> |
else if (!strcasecmp(cnm, "CIE-u")) |
1402 |
> |
ct = tt_u; |
1403 |
> |
else if (!strcasecmp(cnm, "CIE-v")) |
1404 |
> |
ct = tt_v; |
1405 |
> |
else |
1406 |
> |
continue; |
1407 |
|
for (wdb = ezxml_child(wld, "WavelengthDataBlock"); |
1408 |
|
wdb != NULL; wdb = wdb->next) |
1409 |
< |
if ((ec = load_bsdf_data(sd, wdb, rank)) != SDEnone) |
1409 |
> |
if ((ec = load_bsdf_data(sd, wdb, ct, rank)) != SDEnone) |
1410 |
|
return ec; |
1411 |
|
} |
1412 |
|
/* separate diffuse components */ |
1413 |
|
extract_diffuse(&sd->rLambFront, sd->rf); |
1414 |
|
extract_diffuse(&sd->rLambBack, sd->rb); |
1415 |
< |
extract_diffuse(&sd->tLamb, (sd->tf != NULL) ? sd->tf : sd->tb); |
1415 |
> |
if (sd->tf != NULL) |
1416 |
> |
extract_diffuse(&sd->tLamb, sd->tf); |
1417 |
> |
if (sd->tb != NULL) |
1418 |
> |
extract_diffuse(&sd->tLamb, sd->tb); |
1419 |
|
/* return success */ |
1420 |
|
return SDEnone; |
1421 |
|
} |