			/* RCSid $Id: pmap.h,v 2.9 2018/01/24 19:39:05 rschregle Exp $ */

			/*
			======================================================================
			Photon map main header

			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")
			(c) Tokyo University of Science,
			supported by the JSPS Grants-in-Aid for Scientific Research
			(KAKENHI JP19KK0115, "Three-Dimensional Light Flow")
			======================================================================

			$Id: pmap.h,v 2.9 2018/01/24 19:39:05 rschregle Exp $

			TODO:
			-- Precomp. contrib photons
			*/


			#ifndef PMAP_H
			#define PMAP_H

			#ifndef NIX
			#if defined(_WIN32) \|\| defined(_WIN64)
			#define NIX 0
			#else
			#define NIX 1
			#endif
			#endif

			#include "pmapparm.h"
			#include "pmapdata.h"


			#ifndef min
			#define min(a, b) ((a) < (b) ? (a) : (b))
			#endif

			#ifndef max
			#define max(a, b) ((a) > (b) ? (a) : (b))
			#endif

			#define sqr(a) ((a) * (a))

			/* Average over colour channels */
			#define colorAvg(col) ((col [0] + col [1] + col [2]) / 3)

			/* Macros to test for enabled photon maps */
			#define photonMapping (\
			globalPmap \|\| preCompPmap \|\| causticPmap \|\| contribPmap\
			)
			#define causticPhotonMapping (causticPmap)
			#ifdef PMAP_PHOTONFLOW
			/* Photon flow also accounts for direct component */
			#define directPhotonMapping (directPmap \|\| lightFlowPhotonMapping)
			#else
			#define directPhotonMapping (directPmap)
			#endif
			#define volumePhotonMapping (volumePmap)
			/* #define contribPhotonMapping (contribPmap && contribPmap -> srcContrib)
			*/
			#define contribPhotonMapping (contribPmap)
			#define lightFlowPhotonMapping (lightFlowPmap)


			extern void (pmapLookup [])(PhotonMap, RAY*, COLOR);
			/* Photon map lookup functions per type */

			void loadPmaps (PhotonMap *pmaps, const PhotonMapParams params);
			/* Load photon and set their respective parameters, checking timestamps
			* relative to octree for possible staleness */

			void savePmaps (const PhotonMap pmaps, int argc, char argv);
			/* Save all defined photon maps with specified command line */

			void cleanUpPmaps (PhotonMap **pmaps);
			/* Trash all photon maps after processing is complete */

			void distribPhotons (PhotonMap **pmaps, unsigned numProc);
			/* Emit photons from light sources and build photon maps for non-NULL
			* entries in photon map array */

			void tracePhoton (RAY*);
			/* Follow photon as it bounces around the scene. Analogon to
			* raytrace(). */

			void photonDensity (PhotonMap, RAY, COLOR irrad);
			/* Perform surface density estimate from incoming photon flux at
			ray's intersection point. Returns irradiance from found photons. */

			void photonPreCompDensity (PhotonMap pmap, RAY r, COLOR irrad);
			/* Returns precomputed photon density estimate at ray -> rop. */

			void volumePhotonDensity (PhotonMap, RAY, COLOR);
			/* Perform volume density estimate from incoming photon flux at
			ray's intersection point. Returns irradiance. */

			void colorNorm (COLOR);
			/* Normalise colour channels to average of 1 */

			#endif

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