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/*
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==================================================================
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Photon map main header
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(c) Fraunhofer Institute for Solar Energy Systems,
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Lucerne University of Applied Sciences & Arts
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==================================================================
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$Id: pmap.h,v 4.7 2014/12/01 17:28:40 taschreg Exp $
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*/
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#ifndef PMAP_H
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#define PMAP_H
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#include "pmapparm.h"
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#include "pmapdata.h"
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#define min(a, b) ((a) < (b) ? (a) : (b))
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#define max(a, b) ((a) > (b) ? (a) : (b))
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#define sqr(a) ((a) * (a))
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/* Average over colour channels */
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#define colorAvg(col) ((col [0] + col [1] + col [2]) / 3)
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/* Macros to test for enabled photon maps */
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#define photonMapping (globalPmap || preCompPmap || \
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causticPmap ||contribPmap)
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#define causticPhotonMapping (causticPmap)
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#define directPhotonMapping (directPmap)
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#define volumePhotonMapping (volumePmap)
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#define contribPhotonMapping (contribPmap && contribPmap -> srcContrib)
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extern void (*pmapLookup [])(PhotonMap*, RAY*, COLOR);
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/* Photon map lookup functions per type */
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void loadPmaps (PhotonMap **pmaps, const PhotonMapParams *params);
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/* Load photon and set their respective parameters, checking timestamps
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* relative to octree for possible staleness */
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void savePmaps (const PhotonMap **pmaps, int argc, char **argv);
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/* Save all defined photon maps with specified command line */
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void cleanUpPmaps (PhotonMap **pmaps);
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/* Trash all photon maps after processing is complete */
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void distribPhotons (PhotonMap **pmaps);
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/* Emit photons from light sources and build photon maps for non-NULL
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* entries in photon map array */
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void tracePhoton (RAY*);
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/* Follow photon as it bounces around the scene. Analogon to
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* raytrace(). */
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void photonDensity (PhotonMap*, RAY*, COLOR irrad);
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/* Perform surface density estimate from incoming photon flux at
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ray's intersection point. Returns irradiance from found photons. */
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void photonPreCompDensity (PhotonMap *pmap, RAY *r, COLOR irrad);
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/* Returns precomputed photon density estimate at ray -> rop. */
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void volumePhotonDensity (PhotonMap*, RAY*, COLOR);
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/* Perform volume density estimate from incoming photon flux at
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ray's intersection point. Returns irradiance. */
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void colorNorm (COLOR);
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/* Normalise colour channels to average of 1 */
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#endif
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