			#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 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
			);

			#ifdef PMAP_OOC
			if (isContribChildPmap(pmap) && pmap -> preCompContrib) {
			/* Child contrib pmap containing precomputed contributions;
			append binning params to header */
			const PreComputedContrib preCompContrib = (PreComputedContrib)(
			pmap -> preCompContrib
			);
			const unsigned long nBins = (unsigned long)preCompContrib -> scDim *
			preCompContrib -> scDim;

			fprintf(file,
			"Bin resolution\t= %u\n"
			"Num bins\t= %u x %u\n"
			"Num compressed\t= %u/%lu\n"
			"Compression\t= %.1f%%\n",
			preCompContrib -> l,
			preCompContrib -> scDim, preCompContrib -> scDim,
			preCompContrib -> nCompressedBins, nBins,
			100 * (1 - (float)preCompContrib -> nCompressedBins / nBins)
			);
			}
			#endif

			/* 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);

			#ifdef PMAP_OOC
			if (isContribChildPmap(pmap) && pmap -> preCompContrib) {
			/* Child contrib photon map containing per-modifier precomputed
			contributions; save bin resolution and num compressed bins */
			const PreComputedContrib preCompContrib = (PreComputedContrib)(
			pmap -> preCompContrib
			);

			putint(preCompContrib -> l, sizeof(preCompContrib -> l), file);
			putint(preCompContrib -> nCompressedBins,
			sizeof(preCompContrib -> nCompressedBins), file
			);
			}
			else if (isContribPmap(pmap) && pmap -> preCompContribTab)
			/* Parent contrib photon map; save child photon maps containing
			per-modifier precomputed contributions */
			saveContribPhotonMap(pmap, fname, argc, argv);

			/* Save photon storage (except if parent contribution photon map, which
			* just acts as a container for its children) */
			if (!isContribPmap(pmap) && 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);
			}

			/* Init empty photon map of found type */
			initPhotonMap(pmap, ptype);

			/* Set filename (prefixed by contrib pmap for per-modifier files) */
			pmap -> fileName = (char*)fname;

			/* 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);

			#ifdef PMAP_OOC
			if (isContribChildPmap(pmap)) {
			/* Per-modifier precomputed contribution (child) photon map;
			allocate precomputed contributions, get bin resolution and
			number of bins */
			PreComputedContrib preCompContrib = (PreComputedContrib)(
			pmap -> preCompContrib = malloc(sizeof(PreComputedContrib))
			);

			if (!preCompContrib)
			error(SYSTEM, "out of memory allocating precomputed contributions"
			" in loadPhotonMap()"
			);

			preCompContrib -> l = getint(sizeof(preCompContrib -> l), file);
			preCompContrib -> scDim = PMAP_CONTRIB_SCDIM(preCompContrib -> l);
			preCompContrib -> nBins =
			preCompContrib -> scDim * preCompContrib -> scDim;
			preCompContrib -> nCompressedBins = getint(
			sizeof(preCompContrib -> nCompressedBins), file
			);
			}
			else if (isContribPmap(pmap))
			/* Parent contrib photon map; load child photon maps containing
			per-modifier precomputed contributions */
			loadContribPhotonMap(pmap, fname);

			/* Load photon storage (except if parent contribution photon map, which
			* just acts as a container for its children) */
			if (!isContribPmap(pmap) && 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 load all photon maps and set their parameters */
			{
			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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