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pmapio.c
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Thu, May 16, 06:27

pmapio.c
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#ifndef lint
static const char RCSid[] = "$Id: pmapio.c,v 2.13 2021/02/18 17:08:50 rschregle Exp $";
#endif
/*
=========================================================================
Photon map portable file I/O
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
(c) Fraunhofer Institute for Solar Energy Systems,
supported by the German Research Foundation
(DFG LU-204/10-2, "Fassadenintegrierte Regelsysteme FARESYS")
(c) Lucerne University of Applied Sciences and Arts,
supported by the Swiss National Science Foundation
(SNSF #147053, "Daylight Redirecting Components",
SNSF #179067, "Light Fields for Spatio-Temporal Glare Assessment")
(c) Tokyo University of Science,
supported by the JSPS Grants-in-Aid for Scientific Research
(KAKENHI JP19KK0115, "Three-Dimensional Light Flow")
=========================================================================
$Id: pmapio.c,v 2.13 2021/02/18 17:08:50 rschregle Exp $
*/
#include "pmapio.h"
#include "pmapdiag.h"
#include "pmapcontrib.h"
#include "resolu.h"
#include <sys/stat.h>
extern char *octname;
void savePhotonMap (const PhotonMap *pmap, const char *fname,
int argc, char **argv
)
{
unsigned long i, j;
FILE *file;
if (!pmap || !pmap -> numPhotons || !validPmapType(pmap -> type)) {
error(INTERNAL, "attempt to save empty or invalid photon map");
return;
}
if (verbose) {
sprintf(errmsg, "Saving %s (%ld photons)\n",
fname, pmap -> numPhotons
);
eputs(errmsg);
fflush(stderr);
}
if (!(file = fopen(fname, "wb"))) {
sprintf(errmsg, "can't open photon map file %s", fname);
error(SYSTEM, errmsg);
}
/* Write header */
newheader("RADIANCE", file);
/* Write command line */
printargs(argc, argv, file);
/* Include statistics in info text */
fprintf(file,
"NumPhotons\t= %ld\n"
"AvgFlux\t\t= [%.2e, %.2e, %.2e]\n"
"Bbox\t\t= [%.3f, %.3f, %.3f] [%.3f, %.3f, %.3f]\n"
"CoG\t\t= [%.3f, %.3f, %.3f]\n"
"MaxDist^2\t= %.3f\n"
"Velocity\t= %g / sec\n"
"Timespan\t= [%e, %e] sec\n"
"AvgPathLen\t= %.3f\n",
pmap -> numPhotons,
pmap -> photonFlux [0], pmap -> photonFlux [1], pmap -> photonFlux [2],
pmap -> minPos [0], pmap -> minPos [1], pmap -> minPos [2],
pmap -> maxPos [0], pmap -> maxPos [1], pmap -> maxPos [2],
pmap -> CoG [0], pmap -> CoG [1], pmap -> CoG [2],
pmap -> CoGdist, pmap -> velocity,
pmap -> minPathLen / pmap -> velocity,
pmap -> maxPathLen / pmap -> velocity,
pmap -> avgPathLen
);
/* Write format, including human-readable file version */
fputformat((char *)pmapFormat [pmap -> type], file);
fprintf(file, "VERSION=%s\n", PMAP_FILEVER);
/* Empty line = end of header */
putc('\n', file);
/* Write machine-readable file format version */
putstr(PMAP_FILEVER, file);
/* Write number of photons as fixed size, which possibly results in
* padding of MSB with 0 on some platforms. Unlike sizeof() however,
* this ensures portability since this value may span 32 or 64 bits
* depending on platform. */
putint(pmap -> numPhotons, PMAP_LONGSIZE, file);
/* Write average photon flux */
for (j = 0; j < 3; j++)
putflt(pmap -> photonFlux [j], file);
/* Write max and min photon positions */
for (j = 0; j < 3; j++) {
putflt(pmap -> minPos [j], file);
putflt(pmap -> maxPos [j], file);
}
/* Write centre of gravity */
for (j = 0; j < 3; j++)
putflt(pmap -> CoG [j], file);
/* Write avg distance to centre of gravity */
putflt(pmap -> CoGdist, file);
/* Save photon's velocity (speed of light in units of scene geometry),
min/max/avg photon path length (= timespan and temporal CoG) */
putflt(pmap -> velocity, file);
putflt(pmap -> minPathLen, file);
putflt(pmap -> maxPathLen, file);
putflt(pmap -> avgPathLen, file);
/* Save photon storage */
#ifdef PMAP_OOC
if (isContribPmap(pmap) && pmap -> preCompContribTab)
/* Save constituent per-modifier precomputed contribution pmaps */
saveContribPhotonMap(pmap, argc, argv);
else if (OOC_SavePhotons(pmap, file)) {
#else
if (kdT_SavePhotons(pmap, file)) {
#endif
sprintf(errmsg, "error writing photon map file %s", fname);
error(SYSTEM, errmsg);
}
fclose(file);
}
PhotonMapType loadPhotonMap (PhotonMap *pmap, const char *fname)
{
PhotonMapType ptype = PMAP_TYPE_NONE;
char format [MAXFMTLEN];
unsigned long i, j;
FILE *file;
if (!pmap)
return PMAP_TYPE_NONE;
if ((file = fopen(fname, "rb")) == NULL) {
sprintf(errmsg, "can't open photon map file %s", fname);
error(SYSTEM, errmsg);
}
/* Get format string */
strcpy(format, PMAP_FORMAT_GLOB);
if (checkheader(file, format, NULL) != 1) {
sprintf(errmsg, "photon map file %s has an unknown format", fname);
error(USER, errmsg);
}
/* Identify photon map type from format string */
for (ptype = 0;
ptype < NUM_PMAP_TYPES && strcmp(pmapFormat [ptype], format);
ptype++
);
if (!validPmapType(ptype)) {
sprintf(errmsg, "file %s contains an unknown photon map type", fname);
error(USER, errmsg);
}
initPhotonMap(pmap, ptype);
/* Get file format version and check for compatibility */
if (strcmp(getstr(format, file), PMAP_FILEVER))
error(USER, "incompatible photon map file format");
/* Get number of photons as fixed size, which possibly results in
* padding of MSB with 0 on some platforms. Unlike sizeof() however,
* this ensures portability since this value may span 32 or 64 bits
* depending on platform. */
pmap -> numPhotons = getint(PMAP_LONGSIZE, file);
/* Get average photon flux */
for (j = 0; j < 3; j++)
pmap -> photonFlux [j] = getflt(file);
/* Get max and min photon positions */
for (j = 0; j < 3; j++) {
pmap -> minPos [j] = getflt(file);
pmap -> maxPos [j] = getflt(file);
}
/* Get centre of gravity */
for (j = 0; j < 3; j++)
pmap -> CoG [j] = getflt(file);
/* Get avg distance to centre of gravity */
pmap -> CoGdist = getflt(file);
/* Get photon's velocity (speed of light in units of scene geometry),
min/max/avg photon path length (= timespan) and temporal CoG */
pmap -> velocity = getflt(file);
pmap -> minPathLen = getflt(file);
pmap -> maxPathLen = getflt(file);
pmap -> avgPathLen = getflt(file);
/* Load photon storage */
#ifdef PMAP_OOC
if (OOC_LoadPhotons(pmap, file)) {
#else
if (kdT_LoadPhotons(pmap, file)) {
#endif
sprintf(errmsg, "error reading photon map file %s", fname);
error(SYSTEM, errmsg);
}
fclose(file);
return ptype;
}
void savePmaps (const PhotonMap **pmaps, int argc, char **argv)
/* Wrapper to save all defined photon maps with specified command line */
{
unsigned t;
for (t = 0; t < NUM_PMAP_TYPES; t++) {
if (pmaps [t])
savePhotonMap(pmaps [t], pmaps [t] -> fileName, argc, argv);
}
}
void loadPmaps (PhotonMap **pmaps, const PhotonMapParams *parm)
/* Wrapper to save all defined photon maps with specified command line */
{
unsigned t;
struct stat octstat, pmstat;
PhotonMap *pm;
PhotonMapType type;
for (t = 0; t < NUM_PMAP_TYPES; t++)
if (setPmapParam(&pm, parm + t)) {
/* Check if photon map newer than octree */
if (
pm -> fileName && octname &&
!stat(pm -> fileName, &pmstat) && !stat(octname, &octstat) &&
octstat.st_mtime > pmstat.st_mtime
) {
sprintf(
errmsg, "photon map in file %s may be stale", pm -> fileName
);
error(USER, errmsg);
}
/* Load photon map from file and get its type */
if ((type = loadPhotonMap(pm, pm -> fileName)) == PMAP_TYPE_NONE)
error(USER, "failed loading photon map");
/* Assign to appropriate photon map type (deleting previously
* loaded photon map of same type if necessary) */
if (pmaps [type]) {
sprintf(
errmsg, "multiple %s photon maps, dropping previous",
pmapName [type]
);
error(WARNING, errmsg);
deletePhotons(pmaps [type]);
free(pmaps [type]);
}
pmaps [type] = pm;
/* Check for valid density estimate bandwidths */
if (
(pm -> minGather > 1 || pm -> maxGather > 1) &&
(type == PMAP_TYPE_PRECOMP)
) {
/* Force bwidth to 1 for precomputed pmap */
error(WARNING, "ignoring bandwidth for precomp photon map");
pm -> minGather = pm -> maxGather = 1;
}
if (
(pm -> maxGather > pm -> minGather) && (type == PMAP_TYPE_VOLUME)
) {
/* Biascomp for volume pmaps (see volumePhotonDensity() below)
is considered redundant, and there's probably no point in
recovering by using the lower bandwidth, since it's probably
not what the user wants, so bail out. */
sprintf(
errmsg,
"bias compensation is not available with %s photon maps",
pmapName [type]
);
error(USER, errmsg);
}
if (pm -> maxGather > pm -> numPhotons) {
/* Clamp lookup bandwidth to total number of photons (minus one,
since density estimate gets extra photon to obtain averaged
radius) */
sprintf(
errmsg, "clamping density estimate bandwidth to %ld",
pm -> numPhotons
);
error(WARNING, errmsg);
pm -> minGather = pm -> maxGather = pm -> numPhotons - 1;
}
}
}

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