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greg |
2.4 |
/* RCSid $Id: pmapsrc.h,v 2.3 2015/08/18 18:45:55 greg Exp $ */
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rschregle |
2.5 |
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greg |
2.1 |
/*
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==================================================================
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Photon map support routines for emission from light sources
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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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rschregle |
2.2 |
(c) Lucerne University of Applied Sciences and Arts,
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supported by the Swiss National Science Foundation (SNSF, #147053)
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greg |
2.1 |
==================================================================
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rschregle |
2.5 |
$Id: pmapsrc.h,v 2.2 2015/05/08 13:20:23 rschregle Exp $
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greg |
2.1 |
*/
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#ifndef PMAPSRC_H
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#define PMAPSRC_H
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#include "ray.h"
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#include "source.h"
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/* Data structures for photon emission */
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typedef struct {
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unsigned theta, phi; /* Direction indices */
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COLOR pdf; /* Probability of emission in this
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direction per RGB */
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float cdf; /* Cumulative probability up to
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this sample */
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} EmissionSample;
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typedef struct {
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unsigned numTheta, numPhi; /* Num divisions in theta & phi */
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RREAL cosThetaMax; /* cos(source aperture) */
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FVECT uh, vh, wh; /* Emission aperture axes at origin,
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w is normal*/
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FVECT us, vs, ws; /* Source surface axes at origin,
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w is normal */
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FVECT photonOrg; /* Current photon origin */
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EmissionSample *samples; /* PDF samples for photon emission
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directions */
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unsigned long numPartitions; /* Number of surface partitions */
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RREAL partArea; /* Area covered by each partition */
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SRCREC *src, *port; /* Current source and port */
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unsigned long partitionCnt, /* Current surface partition */
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maxPartitions, /* Max allocated partitions */
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numSamples; /* Number of PDF samples */
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unsigned char* partitions; /* Source surface partitions */
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COLOR partFlux; /* Total flux emitted by partition */
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float cdf; /* Cumulative probability */
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} EmissionMap;
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/* Photon port list for emission from geometry en lieu of light sources */
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extern SRCREC *photonPorts;
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extern unsigned numPhotonPorts;
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/* Dispatch tables for partitioning light source surfaces and generating
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an origin for photon emission */
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extern void (*photonPartition []) (EmissionMap*);
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extern void (*photonOrigin []) (EmissionMap*);
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void getPhotonPorts ();
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/* Find geometry declared as photon ports */
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void initPhotonEmissionFuncs ();
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/* Init photonPartition[] and photonOrigin[] dispatch tables with source
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specific emission routines */
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void initPhotonEmission (EmissionMap *emap, float numPdfSamples);
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/* Initialize photon emission from partitioned light source emap -> src;
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* this involves integrating the flux emitted from the current photon
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* origin emap -> photonOrg and setting up a PDF to sample the emission
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* distribution with numPdfSamples samples */
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void emitPhoton (const EmissionMap*, RAY* ray);
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/* Emit photon from current source partition based on emission
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distribution and return new photon ray */
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void multDirectPmap (RAY *r);
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/* Factor irradiance from direct photons into r -> rcol; interface to
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* direct() */
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void inscatterVolumePmap (RAY *r, COLOR inscatter);
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/* Add inscattering from volume photon map; interface to srcscatter() */
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#endif
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