RadiancePmap/pmutil.c
eda1af4994b7fixSpecular

pmutil.c
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			#ifndef lint
			static const char RCSid[] = "$Id: pmutil.c,v 2.5 2020/04/08 15:14:21 rschregle Exp $";
			#endif

			/*
			======================================================================
			Auxiliary photon map utilities

			Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
			(c) Fraunhofer Institute for Solar Energy Systems,
			(c) Lucerne University of Applied Sciences and Arts,
			supported by the Swiss National Science Foundation (SNSF, #147053)
			======================================================================

			$Id: pmutil.c,v 2.5 2020/04/08 15:14:21 rschregle Exp $
			*/

			#include "pmutil.h"
			#if NIX
			#include <fcntl.h>
			#endif



			void colorNorm (COLOR c)
			/* Normalise colour channels to average of 1 */
			{
			const float avg = colorAvg(c);

			if (!avg)
			return;

			c [0] /= avg;
			c [1] /= avg;
			c [2] /= avg;
			}



			void cleanUpPmaps (PhotonMap **pmaps)
			{
			unsigned t;

			for (t = 0; t < NUM_PMAP_TYPES; t++) {
			if (pmaps [t]) {
			deletePhotons(pmaps [t]);
			free(pmaps [t]);
			}
			}
			}



			#if NIX
			void shmLock (int shmFile, int type)
			/* Set/release record lock on shared memory file,
			where type is either F_RDLCK, F_WRLCK or F_UNLCK*/
			{
			struct flock lock;

			lock.l_type = type;
			lock.l_whence = SEEK_SET;
			lock.l_start = lock.l_len = 0;

			/* F_SETLKW waits until file is released by other process. A loop
			* handles interrupt by a signal (error EINTR). */
			do
			if (fcntl(shmFile, F_SETLKW, &lock) >= 0)
			/* Okie dokie */
			return;
			while (errno == EINTR);

			error(SYSTEM,
			"failed to (un)lock shared memory in distribPhotonContrib()"
			);
			}
			#endif