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* |
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*/ |
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+ |
#define _USE_MATH_DEFINES |
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#include "rtio.h" |
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#include <stdlib.h> |
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#include <math.h> |
26 |
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|
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/* reference width maximum (1.0) */ |
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static const unsigned iwbits = sizeof(unsigned)*4; |
29 |
< |
static const unsigned iwmax = (1<<(sizeof(unsigned)*4))-1; |
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> |
static const unsigned iwmax = 1<<(sizeof(unsigned)*4); |
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/* maximum cumulative value */ |
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static const unsigned cumlmax = ~0; |
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/* constant z-vector */ |
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static const FVECT zvec = {.0, .0, 1.}; |
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/* quantization value */ |
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static double quantum = 1./256.; |
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|
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/* Struct used for our distribution-building callback */ |
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typedef struct { |
610 |
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{ |
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const SDTre *sdt; |
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double inCoord[2]; |
610 |
– |
int vflags; |
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int i; |
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SDTreCDst *cd, *cdlast; |
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/* check arguments */ |
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if ((inVec == NULL) | (sdc == NULL) || |
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(sdt = (SDTre *)sdc->dist) == NULL) |
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return NULL; |
619 |
< |
if (sdt->st->ndim == 3) /* isotropic BSDF? */ |
619 |
> |
if (sdt->st->ndim == 3) { /* isotropic BSDF? */ |
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inCoord[0] = .5 - .5*sqrt(inVec[0]*inVec[0] + inVec[1]*inVec[1]); |
621 |
< |
else if (sdt->st->ndim == 4) |
621 |
> |
} else if (sdt->st->ndim == 4) { |
622 |
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SDdisk2square(inCoord, -inVec[0], -inVec[1]); |
623 |
< |
else |
623 |
> |
} else |
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return NULL; /* should be internal error */ |
625 |
+ |
/* quantize to avoid f.p. errors */ |
626 |
+ |
for (i = sdt->st->ndim - 2; i--; ) |
627 |
+ |
inCoord[i] = floor(inCoord[i]/quantum)*quantum + .5*quantum; |
628 |
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cdlast = NULL; /* check for direction in cache list */ |
629 |
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for (cd = (SDTreCDst *)sdc->cdList; cd != NULL; |
630 |
< |
cdlast = cd, cd = (SDTreCDst *)cd->next) { |
630 |
> |
cdlast = cd, cd = cd->next) { |
631 |
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for (i = sdt->st->ndim - 2; i--; ) |
632 |
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if ((cd->clim[i][0] > inCoord[i]) | |
633 |
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(inCoord[i] >= cd->clim[i][1])) |
639 |
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cdlast = cd = make_cdist(sdt, inCoord); |
640 |
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if (cdlast != NULL) { /* move entry to head of cache list */ |
641 |
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cdlast->next = cd->next; |
642 |
< |
cd->next = sdc->cdList; |
642 |
> |
cd->next = (SDTreCDst *)sdc->cdList; |
643 |
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sdc->cdList = (SDCDst *)cd; |
644 |
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} |
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return (SDCDst *)cd; /* ready to go */ |
715 |
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/* binary search to find position */ |
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ilower = 0; iupper = cd->calen; |
717 |
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while ((i = (iupper + ilower) >> 1) != ilower) |
718 |
< |
if ((long)target >= (long)cd->carr[i].cuml) |
718 |
> |
if (target >= cd->carr[i].cuml) |
719 |
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ilower = i; |
720 |
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else |
721 |
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iupper = i; |
846 |
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double stepWidth, dhemi, bmin[4], bmax[4]; |
847 |
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|
848 |
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stepWidth = SDsmallestLeaf(st); |
849 |
+ |
if (quantum > stepWidth) /* adjust quantization factor */ |
850 |
+ |
quantum = stepWidth; |
851 |
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df->minProjSA = M_PI*stepWidth*stepWidth; |
852 |
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if (stepWidth < .03125) |
853 |
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stepWidth = .03125; /* 1/32 resolution good enough */ |
887 |
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SDSpectralDF *df; |
888 |
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SDTre *sdt; |
889 |
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char *sdata; |
883 |
– |
int i; |
890 |
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/* allocate BSDF component */ |
891 |
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sdata = ezxml_txt(ezxml_child(wdb, "WavelengthDataDirection")); |
892 |
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if (!sdata) |