| 1 |
#ifndef lint
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| 2 |
static const char RCSid[] = "$Id: pmapcontrib.c,v 4.30.1.12 2016/05/11 12:40:00 taschreg Exp taschreg $";
|
| 3 |
#endif
|
| 4 |
|
| 5 |
/*
|
| 6 |
======================================================================
|
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Photon map support for light source contributions
|
| 8 |
|
| 9 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(c) Lucerne University of Applied Sciences and Arts,
|
| 11 |
supported by the Swiss National Science Foundation (SNSF, #147053)
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======================================================================
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$Id: pmapcontrib.c,v 4.30.1.12 2016/05/11 12:40:00 taschreg Exp taschreg $
|
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*/
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| 17 |
|
| 18 |
#include "pmapcontrib.h"
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| 19 |
#include "pmapmat.h"
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| 20 |
#include "pmapsrc.h"
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| 21 |
#include "pmaprand.h"
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| 22 |
#include "pmapio.h"
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| 23 |
#include "pmapdiag.h"
|
| 24 |
#include "rcontrib.h"
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#include "otypes.h"
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| 26 |
#include <sys/mman.h>
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| 27 |
#include <sys/wait.h>
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| 31 |
static void setPmapContribParams (PhotonMap *pmap, LUTAB *srcContrib)
|
| 32 |
/* Set parameters for light source contributions */
|
| 33 |
{
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| 34 |
/* Set light source modifier list and appropriate callback to extract
|
| 35 |
* their contributions from the photon map */
|
| 36 |
if (pmap) {
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| 37 |
pmap -> srcContrib = srcContrib;
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| 38 |
pmap -> lookup = photonContrib;
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/* Ensure we get all requested photon contribs during lookups */
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pmap -> gatherTolerance = 1.0;
|
| 41 |
}
|
| 42 |
}
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|
| 44 |
|
| 45 |
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| 46 |
static void checkPmapContribs (const PhotonMap *pmap, LUTAB *srcContrib)
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/* Check modifiers for light source contributions */
|
| 48 |
{
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| 49 |
const PhotonPrimary *primary = pmap -> primaries;
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PhotonPrimaryIdx i, found = 0;
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OBJREC *srcMod;
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| 53 |
/* Make sure at least one of the modifiers is actually in the pmap,
|
| 54 |
* otherwise findPhotons() winds up in an infinite loop! */
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| 55 |
for (i = pmap -> numPrimary; i; --i, ++primary) {
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| 56 |
if (primary -> srcIdx < 0 || primary -> srcIdx >= nsources)
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| 57 |
error(INTERNAL, "invalid light source index in photon map");
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srcMod = findmaterial(source [primary -> srcIdx].so);
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| 60 |
if ((MODCONT*)lu_find(srcContrib, srcMod -> oname) -> data)
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| 61 |
++found;
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| 62 |
}
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| 63 |
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| 64 |
if (!found)
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| 65 |
error(USER, "modifiers not in photon map");
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}
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| 69 |
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void initPmapContrib (LUTAB *srcContrib, unsigned numSrcContrib)
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{
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unsigned t;
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| 74 |
for (t = 0; t < NUM_PMAP_TYPES; t++)
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| 75 |
if (photonMaps [t] && t != PMAP_TYPE_CONTRIB) {
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sprintf(errmsg, "%s photon map does not support contributions",
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pmapName [t]);
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error(USER, errmsg);
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}
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/* Get params */
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setPmapContribParams(contribPmap, srcContrib);
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if (contribPhotonMapping) {
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if (contribPmap -> maxGather < numSrcContrib) {
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/* Adjust density estimate bandwidth if lower than modifier
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* count, otherwise contributions are missing */
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error(WARNING, "contrib density estimate bandwidth too low, "
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| 89 |
"adjusting to modifier count");
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contribPmap -> maxGather = numSrcContrib;
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}
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/* Sanity check */
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checkPmapContribs(contribPmap, srcContrib);
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}
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| 96 |
}
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|
| 98 |
|
| 99 |
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| 100 |
static PhotonPrimaryIdx newPhotonPrimary (PhotonMap *pmap,
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| 101 |
const RAY *primRay,
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| 102 |
FILE *primHeap)
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/* Add primary ray for emitted photon and save light source index, origin on
|
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* source, and emitted direction; used by contrib photons. The current
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* primary is stored in pmap -> lastPrimary. If the previous primary
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* contributed photons (has srcIdx >= 0), it's appended to primHeap. If
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* primRay == NULL, the current primary is still flushed, but no new primary
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* is set. Returns updated primary counter pmap -> numPrimary. */
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{
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| 110 |
if (!pmap || !primHeap)
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return 0;
|
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/* Check if last primary ray has spawned photons (srcIdx >= 0, see
|
| 114 |
* newPhoton()), in which case we write it to the primary heap file
|
| 115 |
* before overwriting it */
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| 116 |
if (pmap -> lastPrimary.srcIdx >= 0) {
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| 117 |
if (!fwrite(&pmap -> lastPrimary, sizeof(PhotonPrimary), 1, primHeap))
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| 118 |
error(SYSTEM, "failed writing photon primary in newPhotonPrimary");
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| 119 |
|
| 120 |
pmap -> numPrimary++;
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| 121 |
if (pmap -> numPrimary > PMAP_MAXPRIMARY)
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| 122 |
error(INTERNAL, "photon primary overflow in newPhotonPrimary");
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}
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| 124 |
|
| 125 |
/* Mark unused with negative source index until path spawns a photon (see
|
| 126 |
* newPhoton()) */
|
| 127 |
pmap -> lastPrimary.srcIdx = -1;
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if (primRay) {
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| 130 |
FVECT dvec;
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| 132 |
/* Reverse incident direction to point to light source */
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| 133 |
dvec [0] = -primRay -> rdir [0];
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dvec [1] = -primRay -> rdir [1];
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dvec [2] = -primRay -> rdir [2];
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pmap -> lastPrimary.dir = encodedir(dvec);
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#ifdef PMAP_PRIMARYPOS
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| 138 |
VCOPY(pmap -> lastPrimary.pos, primRay -> rop);
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#endif
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}
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| 142 |
return pmap -> numPrimary;
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}
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| 145 |
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| 147 |
#ifdef DEBUG_PMAP_CONTRIB
|
| 148 |
static int checkPrimaryHeap (FILE *file)
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| 149 |
/* Check heap for ordered primaries */
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| 150 |
{
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| 151 |
Photon p, lastp;
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| 152 |
int i, dup;
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| 154 |
rewind(file);
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| 155 |
memset(&lastp, 0, sizeof(lastp));
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| 156 |
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| 157 |
while (fread(&p, sizeof(p), 1, file)) {
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dup = 1;
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| 160 |
for (i = 0; i <= 2; i++) {
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| 161 |
if (p.pos [i] < thescene.cuorg [i] ||
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| 162 |
p.pos [i] > thescene.cuorg [i] + thescene.cusize) {
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| 164 |
sprintf(errmsg, "corrupt photon in heap at [%f, %f, %f]\n",
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| 165 |
p.pos [0], p.pos [1], p.pos [2]);
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error(WARNING, errmsg);
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}
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| 169 |
dup &= p.pos [i] == lastp.pos [i];
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| 170 |
}
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| 172 |
if (dup) {
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| 173 |
sprintf(errmsg,
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| 174 |
"consecutive duplicate photon in heap at [%f, %f, %f]\n",
|
| 175 |
p.pos [0], p.pos [1], p.pos [2]);
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| 176 |
error(WARNING, errmsg);
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| 177 |
}
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}
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| 180 |
return 0;
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}
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#endif
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static PhotonPrimaryIdx buildPrimaries (PhotonMap *pmap, FILE **primaryHeap,
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| 187 |
PhotonPrimaryIdx *primaryOfs,
|
| 188 |
unsigned numHeaps)
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/* Consolidate per-subprocess photon primary heaps into the primary array
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| 190 |
* pmap -> primaries. Returns offset for primary index linearisation in
|
| 191 |
* numPrimary. The heap files in primaryHeap are closed on return. */
|
| 192 |
{
|
| 193 |
PhotonPrimaryIdx heapLen;
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| 194 |
unsigned heap;
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| 195 |
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| 196 |
if (!pmap || !primaryHeap || !primaryOfs || !numHeaps)
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return 0;
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pmap -> numPrimary = 0;
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for (heap = 0; heap < numHeaps; heap++) {
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primaryOfs [heap] = pmap -> numPrimary;
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if (fseek(primaryHeap [heap], 0, SEEK_END))
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error(SYSTEM, "failed photon primary seek in buildPrimaries");
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pmap -> numPrimary += heapLen = ftell(primaryHeap [heap]) /
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sizeof(PhotonPrimary);
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pmap -> primaries = realloc(pmap -> primaries,
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pmap -> numPrimary *
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sizeof(PhotonPrimary));
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if (!pmap -> primaries)
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error(SYSTEM, "failed photon primary alloc in buildPrimaries");
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rewind(primaryHeap [heap]);
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if (fread(pmap -> primaries + primaryOfs [heap], sizeof(PhotonPrimary),
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heapLen, primaryHeap [heap]) != heapLen)
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error(SYSTEM, "failed reading photon primaries in buildPrimaries");
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fclose(primaryHeap [heap]);
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}
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return pmap -> numPrimary;
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}
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/* Defs for photon emission counter array passed by sub-processes to parent
|
| 229 |
* via shared memory */
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typedef unsigned long PhotonContribCnt;
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/* Indices for photon emission counter array: num photons stored and num
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* emitted per source */
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#define PHOTONCNT_NUMPHOT 0
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| 235 |
#define PHOTONCNT_NUMEMIT(n) (1 + n)
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| 237 |
|
| 238 |
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void distribPhotonContrib (PhotonMap* pm, unsigned numProc)
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{
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EmissionMap emap;
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char errmsg2 [128], shmFname [255];
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| 243 |
unsigned srcIdx, proc;
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| 244 |
int shmFile, stat, pid;
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double *srcFlux, /* Emitted flux per light source */
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srcDistribTarget; /* Target photon count per source */
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PhotonContribCnt *photonCnt; /* Photon emission counter array */
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| 248 |
const unsigned photonCntSize = sizeof(PhotonContribCnt) *
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| 249 |
PHOTONCNT_NUMEMIT(nsources);
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| 250 |
FILE *primaryHeap [numProc];
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PhotonPrimaryIdx primaryOfs [numProc];
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| 253 |
if (!pm)
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error(USER, "no photon map defined in distribPhotonContrib");
|
| 255 |
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| 256 |
if (!nsources)
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| 257 |
error(USER, "no light sources in distribPhotonContrib");
|
| 258 |
|
| 259 |
if (nsources > MAXMODLIST)
|
| 260 |
error(USER, "too many light sources in distribPhotonContrib");
|
| 261 |
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| 262 |
/* Allocate photon flux per light source; this differs for every
|
| 263 |
* source as all sources contribute the same number of distributed
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| 264 |
* photons (srcDistribTarget), hence the number of photons emitted per
|
| 265 |
* source does not correlate with its emitted flux. The resulting flux
|
| 266 |
* per photon is therefore adjusted individually for each source. */
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| 267 |
if (!(srcFlux = calloc(nsources, sizeof(double))))
|
| 268 |
error(SYSTEM, "can't allocate source flux in distribPhotonContrib");
|
| 269 |
|
| 270 |
/* ===================================================================
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| 271 |
* INITIALISATION - Set up emission and scattering funcs
|
| 272 |
* =================================================================== */
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| 273 |
emap.samples = NULL;
|
| 274 |
emap.src = NULL;
|
| 275 |
emap.maxPartitions = MAXSPART;
|
| 276 |
emap.partitions = (unsigned char*)malloc(emap.maxPartitions >> 1);
|
| 277 |
if (!emap.partitions)
|
| 278 |
error(USER, "can't allocate source partitions in distribPhotonContrib");
|
| 279 |
|
| 280 |
/* Initialise contrib photon map */
|
| 281 |
initPhotonMap(pm, PMAP_TYPE_CONTRIB);
|
| 282 |
initPhotonHeap(pm);
|
| 283 |
initPhotonEmissionFuncs();
|
| 284 |
initPhotonScatterFuncs();
|
| 285 |
|
| 286 |
/* Per-subprocess / per-source target counts */
|
| 287 |
pm -> distribTarget /= numProc;
|
| 288 |
srcDistribTarget = nsources ? (double)pm -> distribTarget / nsources : 0;
|
| 289 |
|
| 290 |
/* Get photon ports if specified */
|
| 291 |
if (ambincl == 1)
|
| 292 |
getPhotonPorts();
|
| 293 |
|
| 294 |
/* Get photon sensor modifiers */
|
| 295 |
getPhotonSensors(photonSensorList);
|
| 296 |
|
| 297 |
/* Set up shared mem for photon counters (zeroed by ftruncate) */
|
| 298 |
#if 0
|
| 299 |
snprintf(shmFname, 255, PMAP_SHMFNAME, getpid());
|
| 300 |
shmFile = shm_open(shmFname, O_CREAT | O_RDWR, S_IRUSR | S_IWUSR);
|
| 301 |
#else
|
| 302 |
strcpy(shmFname, PMAP_SHMFNAME);
|
| 303 |
shmFile = mkstemp(shmFname);
|
| 304 |
#endif
|
| 305 |
|
| 306 |
if (shmFile < 0 || ftruncate(shmFile, photonCntSize) < 0)
|
| 307 |
error(SYSTEM, "failed shared mem init in distribPhotonContrib");
|
| 308 |
|
| 309 |
photonCnt = mmap(NULL, photonCntSize, PROT_READ | PROT_WRITE,
|
| 310 |
MAP_SHARED, shmFile, 0);
|
| 311 |
|
| 312 |
if (photonCnt == MAP_FAILED)
|
| 313 |
error(SYSTEM, "failed shared mem mapping in distribPhotonContrib");
|
| 314 |
|
| 315 |
/* =============================================================
|
| 316 |
* FLUX INTEGRATION - Get total flux emitted from light source
|
| 317 |
* ============================================================= */
|
| 318 |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) {
|
| 319 |
unsigned portCnt = 0;
|
| 320 |
|
| 321 |
srcFlux [srcIdx] = 0;
|
| 322 |
emap.src = source + srcIdx;
|
| 323 |
|
| 324 |
if (photonRepTime)
|
| 325 |
eputs("\n");
|
| 326 |
|
| 327 |
do { /* Need at least one iteration if no ports! */
|
| 328 |
emap.port = emap.src -> sflags & SDISTANT ? photonPorts + portCnt
|
| 329 |
: NULL;
|
| 330 |
photonPartition [emap.src -> so -> otype] (&emap);
|
| 331 |
|
| 332 |
if (photonRepTime) {
|
| 333 |
sprintf(errmsg, "Integrating flux from source %s (mod %s) ",
|
| 334 |
source [srcIdx].so -> oname,
|
| 335 |
objptr(source [srcIdx].so -> omod) -> oname);
|
| 336 |
|
| 337 |
if (emap.port) {
|
| 338 |
sprintf(errmsg2, "via port %s ",
|
| 339 |
photonPorts [portCnt].so -> oname);
|
| 340 |
strcat(errmsg, errmsg2);
|
| 341 |
}
|
| 342 |
|
| 343 |
sprintf(errmsg2, "(%lu partitions)...\n", emap.numPartitions);
|
| 344 |
strcat(errmsg, errmsg2);
|
| 345 |
eputs(errmsg);
|
| 346 |
fflush(stderr);
|
| 347 |
}
|
| 348 |
|
| 349 |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions;
|
| 350 |
emap.partitionCnt++) {
|
| 351 |
initPhotonEmission(&emap, pdfSamples);
|
| 352 |
srcFlux [srcIdx] += colorAvg(emap.partFlux);
|
| 353 |
}
|
| 354 |
|
| 355 |
portCnt++;
|
| 356 |
} while (portCnt < numPhotonPorts);
|
| 357 |
|
| 358 |
if (srcFlux [srcIdx] < FTINY) {
|
| 359 |
sprintf(errmsg, "source %s has zero emission",
|
| 360 |
source [srcIdx].so -> oname);
|
| 361 |
error(WARNING, errmsg);
|
| 362 |
}
|
| 363 |
}
|
| 364 |
|
| 365 |
if (photonRepTime)
|
| 366 |
eputs("\n");
|
| 367 |
|
| 368 |
/* Init per-subprocess primary heap files */
|
| 369 |
for (proc = 0; proc < numProc; proc++)
|
| 370 |
if (!(primaryHeap [proc] = tmpfile()))
|
| 371 |
error(SYSTEM, "failed opening primary heap file in "
|
| 372 |
"distribPhotonContrib");
|
| 373 |
|
| 374 |
/* MAIN LOOP */
|
| 375 |
for (proc = 0; proc < numProc; proc++) {
|
| 376 |
if (!(pid = fork())) {
|
| 377 |
/* SUBPROCESS ENTERS HERE;
|
| 378 |
* all opened and memory mapped files are inherited */
|
| 379 |
|
| 380 |
/* Local photon counters for this subprocess */
|
| 381 |
unsigned long lastNumPhotons = 0, localNumEmitted = 0;
|
| 382 |
double photonFluxSum = 0; /* Running photon flux sum */
|
| 383 |
|
| 384 |
/* Seed RNGs from PID for decorellated photon distribution */
|
| 385 |
pmapSeed(randSeed + proc, partState);
|
| 386 |
pmapSeed(randSeed + proc, emitState);
|
| 387 |
pmapSeed(randSeed + proc, cntState);
|
| 388 |
pmapSeed(randSeed + proc, mediumState);
|
| 389 |
pmapSeed(randSeed + proc, scatterState);
|
| 390 |
pmapSeed(randSeed + proc, rouletteState);
|
| 391 |
|
| 392 |
/* =============================================================
|
| 393 |
* 2-PASS PHOTON DISTRIBUTION
|
| 394 |
* Pass 1 (pre): emit fraction of target photon count
|
| 395 |
* Pass 2 (main): based on outcome of pass 1, estimate remaining
|
| 396 |
* number of photons to emit to approximate target
|
| 397 |
* count
|
| 398 |
* ============================================================= */
|
| 399 |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) {
|
| 400 |
unsigned portCnt, passCnt = 0, prePassCnt = 0;
|
| 401 |
float srcPreDistrib = preDistrib;
|
| 402 |
double srcNumEmit = 0; /* # to emit from source */
|
| 403 |
unsigned long srcNumDistrib = pm -> numPhotons; /* # stored */
|
| 404 |
|
| 405 |
if (srcFlux [srcIdx] < FTINY)
|
| 406 |
continue;
|
| 407 |
|
| 408 |
while (passCnt < 2) {
|
| 409 |
if (!passCnt) {
|
| 410 |
/* INIT PASS 1 */
|
| 411 |
if (++prePassCnt > maxPreDistrib) {
|
| 412 |
/* Warn if no photons contributed after sufficient
|
| 413 |
* iterations */
|
| 414 |
sprintf(errmsg, "proc %d, source %s: "
|
| 415 |
"too many prepasses, skipped",
|
| 416 |
proc, source [srcIdx].so -> oname);
|
| 417 |
error(WARNING, errmsg);
|
| 418 |
break;
|
| 419 |
}
|
| 420 |
|
| 421 |
/* Num to emit is fraction of target count */
|
| 422 |
srcNumEmit = srcPreDistrib * srcDistribTarget;
|
| 423 |
}
|
| 424 |
else {
|
| 425 |
/* INIT PASS 2 */
|
| 426 |
double srcPhotonFlux, avgPhotonFlux;
|
| 427 |
|
| 428 |
/* Based on the outcome of the predistribution we can now
|
| 429 |
* figure out how many more photons we have to emit from
|
| 430 |
* the current source to meet the target count,
|
| 431 |
* srcDistribTarget. This value is clamped to 0 in case
|
| 432 |
* the target has already been exceeded in pass 1.
|
| 433 |
* srcNumEmit and srcNumDistrib is the number of photons
|
| 434 |
* emitted and distributed (stored) from the current
|
| 435 |
* source in pass 1, respectively. */
|
| 436 |
srcNumDistrib = pm -> numPhotons - srcNumDistrib;
|
| 437 |
srcNumEmit *= srcNumDistrib
|
| 438 |
? max(srcDistribTarget/srcNumDistrib, 1) - 1
|
| 439 |
: 0;
|
| 440 |
|
| 441 |
if (!srcNumEmit)
|
| 442 |
/* No photons left to distribute in main pass */
|
| 443 |
break;
|
| 444 |
|
| 445 |
srcPhotonFlux = srcFlux [srcIdx] / srcNumEmit;
|
| 446 |
avgPhotonFlux = photonFluxSum / (srcIdx + 1);
|
| 447 |
|
| 448 |
if (avgPhotonFlux > 0 &&
|
| 449 |
srcPhotonFlux / avgPhotonFlux < FTINY) {
|
| 450 |
/* Skip source if its photon flux is grossly below the
|
| 451 |
* running average, indicating negligible contribs at
|
| 452 |
* the expense of excessive distribution time */
|
| 453 |
sprintf(errmsg, "proc %d, source %s: "
|
| 454 |
"itsy bitsy photon flux, skipped",
|
| 455 |
proc, source [srcIdx].so -> oname);
|
| 456 |
error(WARNING, errmsg);
|
| 457 |
srcNumEmit = 0;
|
| 458 |
}
|
| 459 |
|
| 460 |
/* Update sum of photon flux per light source */
|
| 461 |
photonFluxSum += srcPhotonFlux;
|
| 462 |
}
|
| 463 |
|
| 464 |
portCnt = 0;
|
| 465 |
do { /* Need at least one iteration if no ports! */
|
| 466 |
emap.src = source + srcIdx;
|
| 467 |
emap.port = emap.src -> sflags & SDISTANT
|
| 468 |
? photonPorts + portCnt : NULL;
|
| 469 |
photonPartition [emap.src -> so -> otype] (&emap);
|
| 470 |
|
| 471 |
if (photonRepTime && !proc) {
|
| 472 |
if (!passCnt)
|
| 473 |
sprintf(errmsg, "PREPASS %d on source %s (mod %s) ",
|
| 474 |
prePassCnt, source [srcIdx].so -> oname,
|
| 475 |
objptr(source[srcIdx].so->omod) -> oname);
|
| 476 |
else
|
| 477 |
sprintf(errmsg, "MAIN PASS on source %s (mod %s) ",
|
| 478 |
source [srcIdx].so -> oname,
|
| 479 |
objptr(source[srcIdx].so->omod) -> oname);
|
| 480 |
|
| 481 |
if (emap.port) {
|
| 482 |
sprintf(errmsg2, "via port %s ",
|
| 483 |
photonPorts [portCnt].so -> oname);
|
| 484 |
strcat(errmsg, errmsg2);
|
| 485 |
}
|
| 486 |
|
| 487 |
sprintf(errmsg2, "(%lu partitions)\n",
|
| 488 |
emap.numPartitions);
|
| 489 |
strcat(errmsg, errmsg2);
|
| 490 |
eputs(errmsg);
|
| 491 |
fflush(stderr);
|
| 492 |
}
|
| 493 |
|
| 494 |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions;
|
| 495 |
emap.partitionCnt++) {
|
| 496 |
double partNumEmit;
|
| 497 |
unsigned long partEmitCnt;
|
| 498 |
|
| 499 |
/* Get photon origin within current source partishunn
|
| 500 |
* and build emission map */
|
| 501 |
photonOrigin [emap.src -> so -> otype] (&emap);
|
| 502 |
initPhotonEmission(&emap, pdfSamples);
|
| 503 |
|
| 504 |
/* Number of photons to emit from ziss partishunn;
|
| 505 |
* scale according to its normalised contribushunn to
|
| 506 |
* the emitted source flux */
|
| 507 |
partNumEmit = srcNumEmit * colorAvg(emap.partFlux) /
|
| 508 |
srcFlux [srcIdx];
|
| 509 |
partEmitCnt = (unsigned long)partNumEmit;
|
| 510 |
|
| 511 |
/* Probabilistically account for fractional photons */
|
| 512 |
if (pmapRandom(cntState) < partNumEmit - partEmitCnt)
|
| 513 |
partEmitCnt++;
|
| 514 |
|
| 515 |
/* Update local and shared global emission counter */
|
| 516 |
localNumEmitted += partEmitCnt;
|
| 517 |
photonCnt [PHOTONCNT_NUMEMIT(srcIdx)] += partEmitCnt;
|
| 518 |
|
| 519 |
/* Integer counter avoids FP rounding errors */
|
| 520 |
while (partEmitCnt--) {
|
| 521 |
RAY photonRay;
|
| 522 |
|
| 523 |
/* Emit photon according to PDF (if any), allocate
|
| 524 |
* associated primary ray, and trace through scene
|
| 525 |
* until absorbed/leaked; emitPhoton() sets the
|
| 526 |
* emitting light source index in photonRay */
|
| 527 |
emitPhoton(&emap, &photonRay);
|
| 528 |
newPhotonPrimary(pm, &photonRay, primaryHeap[proc]);
|
| 529 |
/* Set subprocess index in photonRay for post-
|
| 530 |
* distrib primary index linearisation; this is
|
| 531 |
* propagated with the primary index in photonRay
|
| 532 |
* and set for photon hits by newPhoton() */
|
| 533 |
PMAP_SETRAYPROC(&photonRay, proc);
|
| 534 |
tracePhoton(&photonRay);
|
| 535 |
}
|
| 536 |
|
| 537 |
/* Update shared global photon count */
|
| 538 |
photonCnt [PHOTONCNT_NUMPHOT] += pm -> numPhotons -
|
| 539 |
lastNumPhotons;
|
| 540 |
lastNumPhotons = pm -> numPhotons;
|
| 541 |
}
|
| 542 |
|
| 543 |
portCnt++;
|
| 544 |
} while (portCnt < numPhotonPorts);
|
| 545 |
|
| 546 |
if (pm -> numPhotons == srcNumDistrib)
|
| 547 |
/* Double predistrib factor in case no photons were stored
|
| 548 |
* for this source and redo pass 1 */
|
| 549 |
srcPreDistrib *= 2;
|
| 550 |
else {
|
| 551 |
/* Now do pass 2 */
|
| 552 |
passCnt++;
|
| 553 |
/* if (photonRepTime)
|
| 554 |
eputs("\n"); */
|
| 555 |
}
|
| 556 |
}
|
| 557 |
}
|
| 558 |
|
| 559 |
/* Flush heap buffa one final time to prevent data corruption */
|
| 560 |
flushPhotonHeap(pm);
|
| 561 |
fclose(pm -> heap);
|
| 562 |
|
| 563 |
/* Flush final photon primary to primary heap file */
|
| 564 |
newPhotonPrimary(pm, NULL, primaryHeap [proc]);
|
| 565 |
fclose(primaryHeap [proc]);
|
| 566 |
|
| 567 |
#ifdef DEBUG_PMAP
|
| 568 |
sprintf(errmsg, "Proc %d exited with total %ld photons\n", proc,
|
| 569 |
pm -> numPhotons);
|
| 570 |
eputs(errmsg);
|
| 571 |
#endif
|
| 572 |
|
| 573 |
exit(0);
|
| 574 |
}
|
| 575 |
else if (pid < 0)
|
| 576 |
error(SYSTEM, "failed to fork subprocess in distribPhotonContrib");
|
| 577 |
}
|
| 578 |
|
| 579 |
/* PARENT PROCESS CONTINUES HERE */
|
| 580 |
/* Record start time and enable progress report signal handler */
|
| 581 |
repStartTime = time(NULL);
|
| 582 |
#ifdef SIGCONT
|
| 583 |
signal(SIGCONT, pmapDistribReport);
|
| 584 |
#endif
|
| 585 |
/*
|
| 586 |
if (photonRepTime)
|
| 587 |
eputs("\n"); */
|
| 588 |
|
| 589 |
/* Wait for subprocesses to complete while reporting progress */
|
| 590 |
proc = numProc;
|
| 591 |
while (proc) {
|
| 592 |
while (waitpid(-1, &stat, WNOHANG) > 0) {
|
| 593 |
/* Subprocess exited; check status */
|
| 594 |
if (!WIFEXITED(stat) || WEXITSTATUS(stat))
|
| 595 |
error(USER, "failed photon distribution");
|
| 596 |
|
| 597 |
--proc;
|
| 598 |
}
|
| 599 |
|
| 600 |
/* Nod off for a bit and update progress */
|
| 601 |
sleep(1);
|
| 602 |
|
| 603 |
/* Update progress report from shared subprocess counters */
|
| 604 |
repComplete = pm -> distribTarget * numProc;
|
| 605 |
repProgress = photonCnt [PHOTONCNT_NUMPHOT];
|
| 606 |
for (repEmitted = 0, srcIdx = 0; srcIdx < nsources; srcIdx++)
|
| 607 |
repEmitted += photonCnt [PHOTONCNT_NUMEMIT(srcIdx)];
|
| 608 |
|
| 609 |
/* Get global photon count from shmem updated by subprocs */
|
| 610 |
pm -> numPhotons = photonCnt [PHOTONCNT_NUMPHOT];
|
| 611 |
|
| 612 |
if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime)
|
| 613 |
pmapDistribReport();
|
| 614 |
#ifdef SIGCONT
|
| 615 |
else signal(SIGCONT, pmapDistribReport);
|
| 616 |
#endif
|
| 617 |
}
|
| 618 |
|
| 619 |
/* ================================================================
|
| 620 |
* POST-DISTRIBUTION - Set photon flux and build kd-tree, etc.
|
| 621 |
* ================================================================ */
|
| 622 |
#ifdef SIGCONT
|
| 623 |
signal(SIGCONT, SIG_DFL);
|
| 624 |
#endif
|
| 625 |
free(emap.samples);
|
| 626 |
|
| 627 |
if (!pm -> numPhotons)
|
| 628 |
error(USER, "empty photon map");
|
| 629 |
|
| 630 |
/* Load per-subprocess primary rays into pm -> primary array */
|
| 631 |
pm -> numPrimary = buildPrimaries(pm, primaryHeap, primaryOfs, numProc);
|
| 632 |
if (!pm -> numPrimary)
|
| 633 |
error(INTERNAL, "no primary rays in contribution photon map");
|
| 634 |
|
| 635 |
/* Set photon flux per source */
|
| 636 |
for (srcIdx = 0; srcIdx < nsources; srcIdx++)
|
| 637 |
srcFlux [srcIdx] /= photonCnt [PHOTONCNT_NUMEMIT(srcIdx)];
|
| 638 |
|
| 639 |
/* Photon counters no longer needed, unmap shared memory */
|
| 640 |
munmap(photonCnt, sizeof(*photonCnt));
|
| 641 |
close(shmFile);
|
| 642 |
#if 0
|
| 643 |
shm_unlink(shmFname);
|
| 644 |
#else
|
| 645 |
unlink(shmFname);
|
| 646 |
#endif
|
| 647 |
|
| 648 |
if (photonRepTime) {
|
| 649 |
eputs("\nBuilding contrib photon map...\n");
|
| 650 |
fflush(stderr);
|
| 651 |
}
|
| 652 |
|
| 653 |
/* Build underlying data structure; heap is destroyed */
|
| 654 |
buildPhotonMap(pm, srcFlux, primaryOfs, numProc);
|
| 655 |
}
|
| 656 |
|
| 657 |
|
| 658 |
|
| 659 |
void photonContrib (PhotonMap *pmap, RAY *ray, COLOR irrad)
|
| 660 |
/* Sum up light source contributions from photons in pmap->srcContrib */
|
| 661 |
{
|
| 662 |
unsigned i;
|
| 663 |
PhotonSearchQueueNode *sqn;
|
| 664 |
float r, invArea;
|
| 665 |
RREAL rayCoeff [3];
|
| 666 |
Photon *photon;
|
| 667 |
static char warn = 1;
|
| 668 |
|
| 669 |
setcolor(irrad, 0, 0, 0);
|
| 670 |
|
| 671 |
if (!pmap -> maxGather)
|
| 672 |
return;
|
| 673 |
|
| 674 |
/* Ignore sources */
|
| 675 |
if (ray -> ro && islight(objptr(ray -> ro -> omod) -> otype))
|
| 676 |
return;
|
| 677 |
|
| 678 |
/* Get cumulative path coefficient up to photon lookup point */
|
| 679 |
raycontrib(rayCoeff, ray, PRIMARY);
|
| 680 |
|
| 681 |
/* Lookup photons */
|
| 682 |
pmap -> squeue.tail = 0;
|
| 683 |
findPhotons(pmap, ray);
|
| 684 |
|
| 685 |
/* Need at least 2 photons */
|
| 686 |
if (pmap -> squeue.tail < 2) {
|
| 687 |
#ifdef PMAP_NONEFOUND
|
| 688 |
sprintf(errmsg, "no photons found on %s at (%.3f, %.3f, %.3f)",
|
| 689 |
ray -> ro ? ray -> ro -> oname : "<null>",
|
| 690 |
ray -> rop [0], ray -> rop [1], ray -> rop [2]);
|
| 691 |
error(WARNING, errmsg);
|
| 692 |
#endif
|
| 693 |
|
| 694 |
return;
|
| 695 |
}
|
| 696 |
|
| 697 |
/* Average (squared) radius between furthest two photons to improve
|
| 698 |
* accuracy and get inverse search area 1 / (PI * r^2), with extra
|
| 699 |
* normalisation factor 1 / PI for ambient calculation */
|
| 700 |
sqn = pmap -> squeue.node + 1;
|
| 701 |
r = max(sqn -> dist2, (sqn + 1) -> dist2);
|
| 702 |
r = 0.25 * (pmap -> maxDist2 + r + 2 * sqrt(pmap -> maxDist2 * r));
|
| 703 |
invArea = 1 / (PI * PI * r);
|
| 704 |
|
| 705 |
/* Skip the extra photon */
|
| 706 |
for (i = 1 ; i < pmap -> squeue.tail; i++, sqn++) {
|
| 707 |
COLOR flux;
|
| 708 |
|
| 709 |
/* Get photon's contribution to density estimate */
|
| 710 |
photon = getNearestPhoton(&pmap -> squeue, sqn -> idx);
|
| 711 |
getPhotonFlux(photon, flux);
|
| 712 |
scalecolor(flux, invArea);
|
| 713 |
#ifdef PMAP_EPANECHNIKOV
|
| 714 |
/* Apply Epanechnikov kernel to photon flux based on photon distance */
|
| 715 |
scalecolor(flux, 2 * (1 - sqn -> dist2 / r));
|
| 716 |
#endif
|
| 717 |
addcolor(irrad, flux);
|
| 718 |
|
| 719 |
if (pmap -> srcContrib) {
|
| 720 |
const PhotonPrimary *primary = pmap -> primaries +
|
| 721 |
photon -> primary;
|
| 722 |
const SRCREC *sp = &source [primary -> srcIdx];
|
| 723 |
OBJREC *srcMod = findmaterial(sp -> so);
|
| 724 |
MODCONT *srcContrib = (MODCONT*)lu_find(pmap -> srcContrib,
|
| 725 |
srcMod -> oname) -> data;
|
| 726 |
double srcBinReal;
|
| 727 |
int srcBin;
|
| 728 |
RAY srcRay;
|
| 729 |
|
| 730 |
if (!srcContrib)
|
| 731 |
continue;
|
| 732 |
|
| 733 |
/* Photon's emitting light source has modifier whose contributions
|
| 734 |
* are sought */
|
| 735 |
if (srcContrib -> binv -> type != NUM) {
|
| 736 |
/* Use intersection function to set shadow ray parameters if
|
| 737 |
* it's not simply a constant */
|
| 738 |
rayorigin(&srcRay, SHADOW, NULL, NULL);
|
| 739 |
srcRay.rsrc = primary -> srcIdx;
|
| 740 |
#ifdef PMAP_PRIMARYPOS
|
| 741 |
VCOPY(srcRay.rorg, primary -> pos);
|
| 742 |
#else
|
| 743 |
/* No primary hitpoints; set dummy ray origin and warn once */
|
| 744 |
srcRay.rorg [0] = srcRay.rorg [1] = srcRay.rorg [2] = 0;
|
| 745 |
if (warn) {
|
| 746 |
error(WARNING, "no photon primary hitpoints for bin evaluation;"
|
| 747 |
" using dummy (0,0,0) !");
|
| 748 |
warn = 0;
|
| 749 |
}
|
| 750 |
#endif
|
| 751 |
decodedir(srcRay.rdir, primary -> dir);
|
| 752 |
|
| 753 |
if (!(sp->sflags & SDISTANT
|
| 754 |
? sourcehit(&srcRay)
|
| 755 |
: (*ofun[sp -> so -> otype].funp)(sp -> so, &srcRay)))
|
| 756 |
continue; /* XXX shouldn't happen! */
|
| 757 |
|
| 758 |
worldfunc(RCCONTEXT, &srcRay);
|
| 759 |
set_eparams((char *)srcContrib -> params);
|
| 760 |
}
|
| 761 |
|
| 762 |
if ((srcBinReal = evalue(srcContrib -> binv)) < -.5)
|
| 763 |
continue; /* silently ignore negative bins */
|
| 764 |
|
| 765 |
if ((srcBin = srcBinReal + .5) >= srcContrib -> nbins) {
|
| 766 |
error(WARNING, "bad bin number (ignored)");
|
| 767 |
continue;
|
| 768 |
}
|
| 769 |
|
| 770 |
if (!contrib) {
|
| 771 |
/* Ray coefficient mode; normalise by light source radiance
|
| 772 |
* after applying distrib pattern */
|
| 773 |
int j;
|
| 774 |
|
| 775 |
raytexture(ray, srcMod -> omod);
|
| 776 |
setcolor(ray -> rcol, srcMod -> oargs.farg [0],
|
| 777 |
srcMod -> oargs.farg [1], srcMod -> oargs.farg [2]);
|
| 778 |
multcolor(ray -> rcol, ray -> pcol);
|
| 779 |
for (j = 0; j < 3; j++)
|
| 780 |
flux [j] = ray -> rcol [j] ? flux [j] / ray -> rcol [j] : 0;
|
| 781 |
}
|
| 782 |
|
| 783 |
multcolor(flux, rayCoeff);
|
| 784 |
addcolor(srcContrib -> cbin [srcBin], flux);
|
| 785 |
}
|
| 786 |
}
|
| 787 |
|
| 788 |
return;
|
| 789 |
}
|
