1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id: pmapcontrib.c,v 2.18 2018/06/07 19:26:04 rschregle Exp $"; |
3 |
#endif |
4 |
|
5 |
/* |
6 |
====================================================================== |
7 |
Photon map for light source contributions |
8 |
|
9 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
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(c) Lucerne University of Applied Sciences and Arts, |
11 |
supported by the Swiss National Science Foundation (SNSF, #147053) |
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====================================================================== |
13 |
|
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$Id: pmapcontrib.c,v 2.18 2018/06/07 19:26:04 rschregle Exp $ |
15 |
*/ |
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|
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|
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#include "pmapcontrib.h" |
19 |
#include "pmapmat.h" |
20 |
#include "pmapsrc.h" |
21 |
#include "pmaprand.h" |
22 |
#include "pmapio.h" |
23 |
#include "pmapdiag.h" |
24 |
#include "rcontrib.h" |
25 |
#include "otypes.h" |
26 |
#include "otspecial.h" |
27 |
#if NIX |
28 |
#include <sys/mman.h> |
29 |
#include <sys/wait.h> |
30 |
#endif |
31 |
|
32 |
|
33 |
static PhotonPrimaryIdx newPhotonPrimary (PhotonMap *pmap, |
34 |
const RAY *primRay, |
35 |
FILE *primHeap) |
36 |
/* Add primary ray for emitted photon and save light source index, origin on |
37 |
* source, and emitted direction; used by contrib photons. The current |
38 |
* primary is stored in pmap -> lastPrimary. If the previous primary |
39 |
* contributed photons (has srcIdx >= 0), it's appended to primHeap. If |
40 |
* primRay == NULL, the current primary is still flushed, but no new primary |
41 |
* is set. Returns updated primary counter pmap -> numPrimary. */ |
42 |
{ |
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if (!pmap || !primHeap) |
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return 0; |
45 |
|
46 |
/* Check if last primary ray has spawned photons (srcIdx >= 0, see |
47 |
* newPhoton()), in which case we save it to the primary heap file |
48 |
* before clobbering it */ |
49 |
if (pmap -> lastPrimary.srcIdx >= 0) { |
50 |
if (!fwrite(&pmap -> lastPrimary, sizeof(PhotonPrimary), 1, primHeap)) |
51 |
error(SYSTEM, "failed writing photon primary in newPhotonPrimary"); |
52 |
|
53 |
pmap -> numPrimary++; |
54 |
if (pmap -> numPrimary > PMAP_MAXPRIMARY) |
55 |
error(INTERNAL, "photon primary overflow in newPhotonPrimary"); |
56 |
} |
57 |
|
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/* Mark unused with negative source index until path spawns a photon (see |
59 |
* newPhoton()) */ |
60 |
pmap -> lastPrimary.srcIdx = -1; |
61 |
|
62 |
if (primRay) { |
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FVECT dvec; |
64 |
|
65 |
#ifdef PMAP_PRIMARYDIR |
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/* Reverse incident direction to point to light source */ |
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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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#endif |
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#ifdef PMAP_PRIMARYPOS |
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VCOPY(pmap -> lastPrimary.pos, primRay -> rop); |
74 |
#endif |
75 |
} |
76 |
|
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return pmap -> numPrimary; |
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} |
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|
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|
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|
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#ifdef DEBUG_PMAP |
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static int checkPrimaryHeap (FILE *file) |
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/* Check heap for ordered primaries */ |
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{ |
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Photon p, lastp; |
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int i, dup; |
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|
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rewind(file); |
90 |
memset(&lastp, 0, sizeof(lastp)); |
91 |
|
92 |
while (fread(&p, sizeof(p), 1, file)) { |
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dup = 1; |
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|
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for (i = 0; i <= 2; i++) { |
96 |
if (p.pos [i] < thescene.cuorg [i] || |
97 |
p.pos [i] > thescene.cuorg [i] + thescene.cusize) { |
98 |
|
99 |
sprintf(errmsg, "corrupt photon in heap at [%f, %f, %f]\n", |
100 |
p.pos [0], p.pos [1], p.pos [2]); |
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error(WARNING, errmsg); |
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} |
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|
104 |
dup &= p.pos [i] == lastp.pos [i]; |
105 |
} |
106 |
|
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if (dup) { |
108 |
sprintf(errmsg, |
109 |
"consecutive duplicate photon in heap at [%f, %f, %f]\n", |
110 |
p.pos [0], p.pos [1], p.pos [2]); |
111 |
error(WARNING, errmsg); |
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} |
113 |
} |
114 |
|
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return 0; |
116 |
} |
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#endif |
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|
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|
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|
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static PhotonPrimaryIdx buildPrimaries (PhotonMap *pmap, FILE **primaryHeap, |
122 |
char **primaryHeapFname, |
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PhotonPrimaryIdx *primaryOfs, |
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unsigned numHeaps) |
125 |
/* Consolidate per-subprocess photon primary heaps into the primary array |
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* pmap -> primaries. Returns offset for primary index linearisation in |
127 |
* numPrimary. The heap files in primaryHeap are closed on return. */ |
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{ |
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PhotonPrimaryIdx heapLen; |
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unsigned heap; |
131 |
|
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if (!pmap || !primaryHeap || !primaryOfs || !numHeaps) |
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return 0; |
134 |
|
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pmap -> numPrimary = 0; |
136 |
|
137 |
for (heap = 0; heap < numHeaps; heap++) { |
138 |
primaryOfs [heap] = pmap -> numPrimary; |
139 |
|
140 |
if (fseek(primaryHeap [heap], 0, SEEK_END) < 0) |
141 |
error(SYSTEM, "failed photon primary seek in buildPrimaries"); |
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pmap -> numPrimary += heapLen = ftell(primaryHeap [heap]) / |
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sizeof(PhotonPrimary); |
144 |
|
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pmap -> primaries = realloc(pmap -> primaries, |
146 |
pmap -> numPrimary * |
147 |
sizeof(PhotonPrimary)); |
148 |
if (!pmap -> primaries) |
149 |
error(SYSTEM, "failed photon primary alloc in buildPrimaries"); |
150 |
|
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rewind(primaryHeap [heap]); |
152 |
if (fread(pmap -> primaries + primaryOfs [heap], sizeof(PhotonPrimary), |
153 |
heapLen, primaryHeap [heap]) != heapLen) |
154 |
error(SYSTEM, "failed reading photon primaries in buildPrimaries"); |
155 |
|
156 |
fclose(primaryHeap [heap]); |
157 |
unlink(primaryHeapFname [heap]); |
158 |
} |
159 |
|
160 |
return pmap -> numPrimary; |
161 |
} |
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|
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|
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|
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/* Defs for photon emission counter array passed by sub-processes to parent |
166 |
* via shared memory */ |
167 |
typedef unsigned long PhotonContribCnt; |
168 |
|
169 |
/* Indices for photon emission counter array: num photons stored and num |
170 |
* emitted per source */ |
171 |
#define PHOTONCNT_NUMPHOT 0 |
172 |
#define PHOTONCNT_NUMEMIT(n) (1 + n) |
173 |
|
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|
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|
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|
177 |
|
178 |
|
179 |
void distribPhotonContrib (PhotonMap* pm, unsigned numProc) |
180 |
{ |
181 |
EmissionMap emap; |
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char errmsg2 [128], shmFname [PMAP_TMPFNLEN]; |
183 |
unsigned srcIdx, proc; |
184 |
int shmFile, stat, pid; |
185 |
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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unsigned photonCntSize = sizeof(PhotonContribCnt) * |
189 |
PHOTONCNT_NUMEMIT(nsources); |
190 |
FILE **primaryHeap = NULL; |
191 |
char **primaryHeapFname = NULL; |
192 |
PhotonPrimaryIdx *primaryOfs = NULL; |
193 |
|
194 |
if (!pm) |
195 |
error(USER, "no photon map defined in distribPhotonContrib"); |
196 |
|
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if (!nsources) |
198 |
error(USER, "no light sources in distribPhotonContrib"); |
199 |
|
200 |
if (nsources > MAXMODLIST) |
201 |
error(USER, "too many light sources in distribPhotonContrib"); |
202 |
|
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/* Allocate photon flux per light source; this differs for every |
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* source as all sources contribute the same number of distributed |
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* photons (srcDistribTarget), hence the number of photons emitted per |
206 |
* source does not correlate with its emitted flux. The resulting flux |
207 |
* per photon is therefore adjusted individually for each source. */ |
208 |
if (!(srcFlux = calloc(nsources, sizeof(double)))) |
209 |
error(SYSTEM, "can't allocate source flux in distribPhotonContrib"); |
210 |
|
211 |
/* =================================================================== |
212 |
* INITIALISATION - Set up emission and scattering funcs |
213 |
* =================================================================== */ |
214 |
emap.samples = NULL; |
215 |
emap.src = NULL; |
216 |
emap.maxPartitions = MAXSPART; |
217 |
emap.partitions = (unsigned char*)malloc(emap.maxPartitions >> 1); |
218 |
if (!emap.partitions) |
219 |
error(USER, "can't allocate source partitions in distribPhotonContrib"); |
220 |
|
221 |
/* Initialise contrib photon map */ |
222 |
initPhotonMap(pm, PMAP_TYPE_CONTRIB); |
223 |
initPhotonHeap(pm); |
224 |
initPhotonEmissionFuncs(); |
225 |
initPhotonScatterFuncs(); |
226 |
|
227 |
/* Per-subprocess / per-source target counts */ |
228 |
pm -> distribTarget /= numProc; |
229 |
srcDistribTarget = nsources ? (double)pm -> distribTarget / nsources : 0; |
230 |
|
231 |
if (!pm -> distribTarget) |
232 |
error(INTERNAL, "no photons to distribute in distribPhotonContrib"); |
233 |
|
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/* Get photon ports from modifier list */ |
235 |
getPhotonPorts(photonPortList); |
236 |
|
237 |
/* Get photon sensor modifiers */ |
238 |
getPhotonSensors(photonSensorList); |
239 |
|
240 |
#if NIX |
241 |
/* Set up shared mem for photon counters (zeroed by ftruncate) */ |
242 |
strcpy(shmFname, PMAP_TMPFNAME); |
243 |
shmFile = mkstemp(shmFname); |
244 |
|
245 |
if (shmFile < 0 || ftruncate(shmFile, photonCntSize) < 0) |
246 |
error(SYSTEM, "failed shared mem init in distribPhotonContrib"); |
247 |
|
248 |
photonCnt = mmap(NULL, photonCntSize, PROT_READ | PROT_WRITE, |
249 |
MAP_SHARED, shmFile, 0); |
250 |
|
251 |
if (photonCnt == MAP_FAILED) |
252 |
error(SYSTEM, "failed shared mem mapping in distribPhotonContrib"); |
253 |
#else |
254 |
/* Allocate photon counters statically on Windoze */ |
255 |
if (!(photonCnt = malloc(photonCntSize))) |
256 |
error(SYSTEM, "failed trivial malloc in distribPhotonContrib"); |
257 |
|
258 |
for (srcIdx = 0; srcIdx < PHOTONCNT_NUMEMIT(nsources); srcIdx++) |
259 |
photonCnt [srcIdx] = 0; |
260 |
#endif /* NIX */ |
261 |
|
262 |
if (verbose) { |
263 |
sprintf(errmsg, "\nIntegrating flux from %d sources", nsources); |
264 |
|
265 |
if (photonPorts) { |
266 |
sprintf(errmsg2, " via %d ports", numPhotonPorts); |
267 |
strcat(errmsg, errmsg2); |
268 |
} |
269 |
|
270 |
strcat(errmsg, "\n"); |
271 |
eputs(errmsg); |
272 |
} |
273 |
|
274 |
/* ============================================================= |
275 |
* FLUX INTEGRATION - Get total flux emitted from sources/ports |
276 |
* ============================================================= */ |
277 |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
278 |
unsigned portCnt = 0; |
279 |
srcFlux [srcIdx] = 0; |
280 |
emap.src = source + srcIdx; |
281 |
|
282 |
do { /* Need at least one iteration if no ports! */ |
283 |
emap.port = emap.src -> sflags & SDISTANT ? photonPorts + portCnt |
284 |
: NULL; |
285 |
photonPartition [emap.src -> so -> otype] (&emap); |
286 |
|
287 |
if (verbose) { |
288 |
sprintf(errmsg, "\tIntegrating flux from source %s ", |
289 |
source [srcIdx].so -> oname); |
290 |
|
291 |
if (emap.port) { |
292 |
sprintf(errmsg2, "via port %s ", |
293 |
photonPorts [portCnt].so -> oname); |
294 |
strcat(errmsg, errmsg2); |
295 |
} |
296 |
|
297 |
sprintf(errmsg2, "(%lu partitions)\n", emap.numPartitions); |
298 |
strcat(errmsg, errmsg2); |
299 |
eputs(errmsg); |
300 |
#if NIX |
301 |
fflush(stderr); |
302 |
#endif |
303 |
} |
304 |
|
305 |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
306 |
emap.partitionCnt++) { |
307 |
initPhotonEmission(&emap, pdfSamples); |
308 |
srcFlux [srcIdx] += colorAvg(emap.partFlux); |
309 |
} |
310 |
|
311 |
portCnt++; |
312 |
} while (portCnt < numPhotonPorts); |
313 |
|
314 |
if (srcFlux [srcIdx] < FTINY) { |
315 |
sprintf(errmsg, "source %s has zero emission", |
316 |
source [srcIdx].so -> oname); |
317 |
error(WARNING, errmsg); |
318 |
} |
319 |
} |
320 |
|
321 |
/* Allocate & init per-subprocess primary heap files */ |
322 |
primaryHeap = calloc(numProc, sizeof(FILE*)); |
323 |
primaryHeapFname = calloc(numProc, sizeof(char*)); |
324 |
primaryOfs = calloc(numProc, sizeof(PhotonPrimaryIdx)); |
325 |
if (!primaryHeap || !primaryHeapFname || !primaryOfs) |
326 |
error(SYSTEM, "failed primary heap allocation in " |
327 |
"distribPhotonContrib"); |
328 |
|
329 |
for (proc = 0; proc < numProc; proc++) { |
330 |
primaryHeapFname [proc] = malloc(PMAP_TMPFNLEN); |
331 |
if (!primaryHeapFname [proc]) |
332 |
error(SYSTEM, "failed primary heap file allocation in " |
333 |
"distribPhotonContrib"); |
334 |
|
335 |
mktemp(strcpy(primaryHeapFname [proc], PMAP_TMPFNAME)); |
336 |
if (!(primaryHeap [proc] = fopen(primaryHeapFname [proc], "w+b"))) |
337 |
error(SYSTEM, "failed opening primary heap file in " |
338 |
"distribPhotonContrib"); |
339 |
} |
340 |
|
341 |
/* Record start time for progress reports */ |
342 |
repStartTime = time(NULL); |
343 |
|
344 |
if (verbose) { |
345 |
sprintf(errmsg, "\nPhoton distribution @ %d procs\n", numProc); |
346 |
eputs(errmsg); |
347 |
} |
348 |
|
349 |
/* MAIN LOOP */ |
350 |
for (proc = 0; proc < numProc; proc++) { |
351 |
#if NIX |
352 |
if (!(pid = fork())) { |
353 |
/* SUBPROCESS ENTERS HERE; opened and mmapped files inherited */ |
354 |
#else |
355 |
if (1) { |
356 |
/* No subprocess under Windoze */ |
357 |
#endif |
358 |
/* Local photon counters for this subprocess */ |
359 |
unsigned long lastNumPhotons = 0, localNumEmitted = 0; |
360 |
double photonFluxSum = 0; /* Accum. photon flux */ |
361 |
|
362 |
/* Seed RNGs from PID for decorellated photon distribution */ |
363 |
pmapSeed(randSeed + proc, partState); |
364 |
pmapSeed(randSeed + (proc + 1) % numProc, emitState); |
365 |
pmapSeed(randSeed + (proc + 2) % numProc, cntState); |
366 |
pmapSeed(randSeed + (proc + 3) % numProc, mediumState); |
367 |
pmapSeed(randSeed + (proc + 4) % numProc, scatterState); |
368 |
pmapSeed(randSeed + (proc + 5) % numProc, rouletteState); |
369 |
|
370 |
#ifdef PMAP_SIGUSR |
371 |
double partNumEmit; |
372 |
unsigned long partEmitCnt; |
373 |
double srcPhotonFlux, avgPhotonFlux; |
374 |
unsigned portCnt, passCnt, prePassCnt; |
375 |
float srcPreDistrib; |
376 |
double srcNumEmit; /* # to emit from source */ |
377 |
unsigned long srcNumDistrib; /* # stored */ |
378 |
|
379 |
void sigUsrDiags() |
380 |
/* Loop diags via SIGUSR1 */ |
381 |
{ |
382 |
sprintf(errmsg, |
383 |
"********************* Proc %d Diags *********************\n" |
384 |
"srcIdx = %d (%s)\nportCnt = %d (%s)\npassCnt = %d\n" |
385 |
"srcFlux = %f\nsrcPhotonFlux = %f\navgPhotonFlux = %f\n" |
386 |
"partNumEmit = %f\npartEmitCnt = %lu\n\n", |
387 |
proc, srcIdx, findmaterial(source [srcIdx].so) -> oname, |
388 |
portCnt, photonPorts [portCnt].so -> oname, |
389 |
passCnt, srcFlux [srcIdx], srcPhotonFlux, avgPhotonFlux, |
390 |
partNumEmit, partEmitCnt); |
391 |
eputs(errmsg); |
392 |
fflush(stderr); |
393 |
} |
394 |
#endif |
395 |
|
396 |
#ifdef PMAP_SIGUSR |
397 |
signal(SIGUSR1, sigUsrDiags); |
398 |
#endif |
399 |
|
400 |
#ifdef DEBUG_PMAP |
401 |
/* Output child process PID after random delay to prevent corrupted |
402 |
* console output due to race condition */ |
403 |
usleep(1e6 * pmapRandom(rouletteState)); |
404 |
fprintf(stderr, "Proc %d: PID = %d " |
405 |
"(waiting 10 sec to attach debugger...)\n", |
406 |
proc, getpid()); |
407 |
/* Allow time for debugger to attach to child process */ |
408 |
sleep(10); |
409 |
#endif |
410 |
|
411 |
/* ============================================================= |
412 |
* 2-PASS PHOTON DISTRIBUTION |
413 |
* Pass 1 (pre): emit fraction of target photon count |
414 |
* Pass 2 (main): based on outcome of pass 1, estimate remaining |
415 |
* number of photons to emit to approximate target |
416 |
* count |
417 |
* ============================================================= */ |
418 |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) { |
419 |
#ifndef PMAP_SIGUSR |
420 |
unsigned portCnt, passCnt = 0, prePassCnt = 0; |
421 |
float srcPreDistrib = preDistrib; |
422 |
double srcNumEmit = 0; /* # to emit from source */ |
423 |
unsigned long srcNumDistrib = pm -> numPhotons; /* # stored */ |
424 |
#else |
425 |
passCnt = prePassCnt = 0; |
426 |
srcPreDistrib = preDistrib; |
427 |
srcNumEmit = 0; /* # to emit from source */ |
428 |
srcNumDistrib = pm -> numPhotons; /* # stored */ |
429 |
#endif |
430 |
|
431 |
if (srcFlux [srcIdx] < FTINY) |
432 |
continue; |
433 |
|
434 |
while (passCnt < 2) { |
435 |
if (!passCnt) { |
436 |
/* INIT PASS 1 */ |
437 |
if (++prePassCnt > maxPreDistrib) { |
438 |
/* Warn if no photons contributed after sufficient |
439 |
* iterations; only output from subprocess 0 to reduce |
440 |
* console clutter */ |
441 |
if (!proc) { |
442 |
sprintf(errmsg, |
443 |
"source %s: too many prepasses, skipped", |
444 |
source [srcIdx].so -> oname); |
445 |
error(WARNING, errmsg); |
446 |
} |
447 |
|
448 |
break; |
449 |
} |
450 |
|
451 |
/* Num to emit is fraction of target count */ |
452 |
srcNumEmit = srcPreDistrib * srcDistribTarget; |
453 |
} |
454 |
else { |
455 |
/* INIT PASS 2 */ |
456 |
#ifndef PMAP_SIGUSR |
457 |
double srcPhotonFlux, avgPhotonFlux; |
458 |
#endif |
459 |
|
460 |
/* Based on the outcome of the predistribution we can now |
461 |
* figure out how many more photons we have to emit from |
462 |
* the current source to meet the target count, |
463 |
* srcDistribTarget. This value is clamped to 0 in case |
464 |
* the target has already been exceeded in pass 1. |
465 |
* srcNumEmit and srcNumDistrib is the number of photons |
466 |
* emitted and distributed (stored) from the current |
467 |
* source in pass 1, respectively. */ |
468 |
srcNumDistrib = pm -> numPhotons - srcNumDistrib; |
469 |
srcNumEmit *= srcNumDistrib |
470 |
? max(srcDistribTarget/srcNumDistrib, 1) - 1 |
471 |
: 0; |
472 |
|
473 |
if (!srcNumEmit) |
474 |
/* No photons left to distribute in main pass */ |
475 |
break; |
476 |
|
477 |
srcPhotonFlux = srcFlux [srcIdx] / srcNumEmit; |
478 |
avgPhotonFlux = photonFluxSum / (srcIdx + 1); |
479 |
|
480 |
if (avgPhotonFlux > FTINY && |
481 |
srcPhotonFlux / avgPhotonFlux < FTINY) { |
482 |
/* Skip source if its photon flux is grossly below the |
483 |
* running average, indicating negligible contributions |
484 |
* at the expense of excessive distribution time; only |
485 |
* output from subproc 0 to reduce console clutter */ |
486 |
if (!proc) { |
487 |
sprintf(errmsg, |
488 |
"source %s: itsy bitsy photon flux, skipped", |
489 |
source [srcIdx].so -> oname); |
490 |
error(WARNING, errmsg); |
491 |
} |
492 |
|
493 |
srcNumEmit = 0; /* Or just break??? */ |
494 |
} |
495 |
|
496 |
/* Update sum of photon flux per light source */ |
497 |
photonFluxSum += srcPhotonFlux; |
498 |
} |
499 |
|
500 |
portCnt = 0; |
501 |
do { /* Need at least one iteration if no ports! */ |
502 |
emap.src = source + srcIdx; |
503 |
emap.port = emap.src -> sflags & SDISTANT |
504 |
? photonPorts + portCnt : NULL; |
505 |
photonPartition [emap.src -> so -> otype] (&emap); |
506 |
|
507 |
if (verbose && !proc) { |
508 |
/* Output from subproc 0 only to avoid race condition |
509 |
* on console I/O */ |
510 |
if (!passCnt) |
511 |
sprintf(errmsg, "\tPREPASS %d on source %s ", |
512 |
prePassCnt, source [srcIdx].so -> oname); |
513 |
else |
514 |
sprintf(errmsg, "\tMAIN PASS on source %s ", |
515 |
source [srcIdx].so -> oname); |
516 |
|
517 |
if (emap.port) { |
518 |
sprintf(errmsg2, "via port %s ", |
519 |
photonPorts [portCnt].so -> oname); |
520 |
strcat(errmsg, errmsg2); |
521 |
} |
522 |
|
523 |
sprintf(errmsg2, "(%lu partitions)\n", |
524 |
emap.numPartitions); |
525 |
strcat(errmsg, errmsg2); |
526 |
eputs(errmsg); |
527 |
#if NIX |
528 |
fflush(stderr); |
529 |
#endif |
530 |
} |
531 |
|
532 |
for (emap.partitionCnt = 0; emap.partitionCnt < emap.numPartitions; |
533 |
emap.partitionCnt++) { |
534 |
#ifndef PMAP_SIGUSR |
535 |
double partNumEmit; |
536 |
unsigned long partEmitCnt; |
537 |
#endif |
538 |
|
539 |
/* Get photon origin within current source partishunn |
540 |
* and build emission map */ |
541 |
photonOrigin [emap.src -> so -> otype] (&emap); |
542 |
initPhotonEmission(&emap, pdfSamples); |
543 |
|
544 |
/* Number of photons to emit from ziss partishunn; |
545 |
* scale according to its normalised contribushunn to |
546 |
* the emitted source flux */ |
547 |
partNumEmit = srcNumEmit * colorAvg(emap.partFlux) / |
548 |
srcFlux [srcIdx]; |
549 |
partEmitCnt = (unsigned long)partNumEmit; |
550 |
|
551 |
/* Probabilistically account for fractional photons */ |
552 |
if (pmapRandom(cntState) < partNumEmit - partEmitCnt) |
553 |
partEmitCnt++; |
554 |
|
555 |
/* Update local and shared global emission counter */ |
556 |
photonCnt [PHOTONCNT_NUMEMIT(srcIdx)] += partEmitCnt; |
557 |
localNumEmitted += partEmitCnt; |
558 |
|
559 |
/* Integer counter avoids FP rounding errors during |
560 |
* iteration */ |
561 |
while (partEmitCnt--) { |
562 |
RAY photonRay; |
563 |
|
564 |
/* Emit photon according to PDF (if any), allocate |
565 |
* associated primary ray, and trace through scene |
566 |
* until absorbed/leaked; emitPhoton() sets the |
567 |
* emitting light source index in photonRay */ |
568 |
emitPhoton(&emap, &photonRay); |
569 |
#if 1 |
570 |
if (emap.port) |
571 |
/* !!! PHOTON PORT REJECTION SAMPLING HACK: set |
572 |
* !!! photon port as fake hit object for |
573 |
* !!! primary ray to check for intersection in |
574 |
* !!! tracePhoton() */ |
575 |
photonRay.ro = emap.port -> so; |
576 |
#endif |
577 |
newPhotonPrimary(pm, &photonRay, primaryHeap[proc]); |
578 |
/* Set subprocess index in photonRay for post- |
579 |
* distrib primary index linearisation; this is |
580 |
* propagated with the primary index in photonRay |
581 |
* and set for photon hits by newPhoton() */ |
582 |
PMAP_SETRAYPROC(&photonRay, proc); |
583 |
tracePhoton(&photonRay); |
584 |
} |
585 |
|
586 |
/* Update shared global photon count */ |
587 |
photonCnt [PHOTONCNT_NUMPHOT] += pm -> numPhotons - |
588 |
lastNumPhotons; |
589 |
lastNumPhotons = pm -> numPhotons; |
590 |
#if !NIX |
591 |
/* Synchronous progress report on Windoze */ |
592 |
if (!proc && photonRepTime > 0 && |
593 |
time(NULL) >= repLastTime + photonRepTime) { |
594 |
unsigned s; |
595 |
repComplete = pm -> distribTarget * numProc; |
596 |
repProgress = photonCnt [PHOTONCNT_NUMPHOT]; |
597 |
|
598 |
for (repEmitted = 0, s = 0; s < nsources; s++) |
599 |
repEmitted += photonCnt [PHOTONCNT_NUMEMIT(s)]; |
600 |
|
601 |
pmapDistribReport(); |
602 |
} |
603 |
#endif |
604 |
} |
605 |
|
606 |
portCnt++; |
607 |
} while (portCnt < numPhotonPorts); |
608 |
|
609 |
if (pm -> numPhotons == srcNumDistrib) { |
610 |
/* Double predistrib factor in case no photons were stored |
611 |
* for this source and redo pass 1 */ |
612 |
srcPreDistrib *= 2; |
613 |
} |
614 |
else { |
615 |
/* Now do pass 2 */ |
616 |
passCnt++; |
617 |
} |
618 |
} |
619 |
} |
620 |
|
621 |
/* Flush heap buffa one final time to prevent data corruption */ |
622 |
flushPhotonHeap(pm); |
623 |
/* Flush final photon primary to primary heap file */ |
624 |
newPhotonPrimary(pm, NULL, primaryHeap [proc]); |
625 |
/* Heap files closed automatically on exit |
626 |
fclose(pm -> heap); |
627 |
fclose(primaryHeap [proc]); */ |
628 |
|
629 |
#ifdef DEBUG_PMAP |
630 |
sprintf(errmsg, "Proc %d total %ld photons\n", proc, |
631 |
pm -> numPhotons); |
632 |
eputs(errmsg); |
633 |
fflush(stderr); |
634 |
#endif |
635 |
|
636 |
#ifdef PMAP_SIGUSR |
637 |
signal(SIGUSR1, SIG_DFL); |
638 |
#endif |
639 |
|
640 |
#if NIX |
641 |
/* Terminate subprocess */ |
642 |
exit(0); |
643 |
#endif |
644 |
} |
645 |
else if (pid < 0) |
646 |
error(SYSTEM, "failed to fork subprocess in distribPhotonContrib"); |
647 |
} |
648 |
|
649 |
#if NIX |
650 |
/* PARENT PROCESS CONTINUES HERE */ |
651 |
#ifdef SIGCONT |
652 |
/* Enable progress report signal handler */ |
653 |
signal(SIGCONT, pmapDistribReport); |
654 |
#endif |
655 |
/* Wait for subprocesses to complete while reporting progress */ |
656 |
proc = numProc; |
657 |
while (proc) { |
658 |
while (waitpid(-1, &stat, WNOHANG) > 0) { |
659 |
/* Subprocess exited; check status */ |
660 |
if (!WIFEXITED(stat) || WEXITSTATUS(stat)) |
661 |
error(USER, "failed photon distribution"); |
662 |
|
663 |
--proc; |
664 |
} |
665 |
|
666 |
/* Nod off for a bit and update progress */ |
667 |
sleep(1); |
668 |
|
669 |
/* Asynchronous progress report from shared subprocess counters */ |
670 |
repComplete = pm -> distribTarget * numProc; |
671 |
repProgress = photonCnt [PHOTONCNT_NUMPHOT]; |
672 |
|
673 |
for (repEmitted = 0, srcIdx = 0; srcIdx < nsources; srcIdx++) |
674 |
repEmitted += photonCnt [PHOTONCNT_NUMEMIT(srcIdx)]; |
675 |
|
676 |
/* Get global photon count from shmem updated by subprocs */ |
677 |
pm -> numPhotons = photonCnt [PHOTONCNT_NUMPHOT]; |
678 |
|
679 |
if (photonRepTime > 0 && time(NULL) >= repLastTime + photonRepTime) |
680 |
pmapDistribReport(); |
681 |
#ifdef SIGCONT |
682 |
else signal(SIGCONT, pmapDistribReport); |
683 |
#endif |
684 |
} |
685 |
#endif /* NIX */ |
686 |
|
687 |
/* ================================================================ |
688 |
* POST-DISTRIBUTION - Set photon flux and build kd-tree, etc. |
689 |
* ================================================================ */ |
690 |
#ifdef SIGCONT |
691 |
/* Reset signal handler */ |
692 |
signal(SIGCONT, SIG_DFL); |
693 |
#endif |
694 |
free(emap.samples); |
695 |
|
696 |
if (!pm -> numPhotons) |
697 |
error(USER, "empty contribution photon map"); |
698 |
|
699 |
/* Load per-subprocess primary rays into pm -> primary array */ |
700 |
/* Dumb compilers apparently need the char** cast */ |
701 |
pm -> numPrimary = buildPrimaries(pm, primaryHeap, |
702 |
(char**)primaryHeapFname, |
703 |
primaryOfs, numProc); |
704 |
if (!pm -> numPrimary) |
705 |
error(INTERNAL, "no primary rays in contribution photon map"); |
706 |
|
707 |
/* Set photon flux per source */ |
708 |
for (srcIdx = 0; srcIdx < nsources; srcIdx++) |
709 |
srcFlux [srcIdx] /= photonCnt [PHOTONCNT_NUMEMIT(srcIdx)]; |
710 |
#if NIX |
711 |
/* Photon counters no longer needed, unmap shared memory */ |
712 |
munmap(photonCnt, sizeof(*photonCnt)); |
713 |
close(shmFile); |
714 |
unlink(shmFname); |
715 |
#else |
716 |
free(photonCnt); |
717 |
#endif |
718 |
|
719 |
if (verbose) { |
720 |
eputs("\nBuilding contribution photon map...\n"); |
721 |
#if NIX |
722 |
fflush(stderr); |
723 |
#endif |
724 |
} |
725 |
|
726 |
/* Build underlying data structure; heap is destroyed */ |
727 |
buildPhotonMap(pm, srcFlux, primaryOfs, numProc); |
728 |
|
729 |
/* Free per-subprocess primary heap files */ |
730 |
for (proc = 0; proc < numProc; proc++) |
731 |
free(primaryHeapFname [proc]); |
732 |
|
733 |
free(primaryHeapFname); |
734 |
free(primaryHeap); |
735 |
free(primaryOfs); |
736 |
|
737 |
if (verbose) |
738 |
eputs("\n"); |
739 |
} |