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RadiancePmap/pmapio.c
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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 "resolu.h"
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 (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;
}
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