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/*
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==================================================================
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Photon map interface to out-of-core octree
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Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
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(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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==================================================================
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$Id: pmapooc.h,v 1.2 2015/11/13 17:33:53 taschreg Exp taschreg $
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*/
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#ifndef PMAPOOC_H
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#define PMAPOOC_H
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#include "oocnn.h"
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/* Suffixes for octree filenames */
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/* #define PMAP_OOC_NODESUFFIX ".node"
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#define PMAP_OOC_HEAPSUFFIX ".heap" */
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#define PMAP_OOC_LEAFSUFFIX ".leaf"
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/* Out-of-core octree constants */
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#define PMAP_OOC_NUMBLK 32 /* Num blocks for external sort */
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#define PMAP_OOC_BLKSIZE 1e8 /* Block size for external sort */
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#define PMAP_OOC_LEAFMAX (OOC_OCTCNT_MAX) /* Max photons per leaf */
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#define PMAP_OOC_MAXDEPTH (OOC_MORTON_BITS) /* Max octree depth */
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typedef OOC_SearchQueueNode PhotonSearchQueueNode;
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typedef OOC_SearchQueue PhotonSearchQueue;
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typedef OOC_Octree PhotonStorage;
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typedef unsigned PhotonIdx;
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/* Forward declarations to break dependency loop with pmapdata.h */
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struct PhotonMap;
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void OOC_BuildPhotonMap (struct PhotonMap *pmap, unsigned numProc);
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/* Build out-of-core octree pmap -> store from photons in unsorted
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* heapfile pmap -> heap and generate nodes and leaf file with prefix
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* pmap -> fileName. Photon map construction may be parallelised if
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* numProc > 1, if supported. The heap is destroyed on return. */
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int OOC_SavePhotons (const struct PhotonMap *pmap, FILE *out);
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/* Save photons in out-of-core octree to file. Return -1 on error,
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* else 0 */
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int OOC_LoadPhotons (struct PhotonMap *pmap, FILE *in);
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/* Load photons in out-of-core octree from file. Return -1 on error,
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* else 0 */
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void OOC_InitFindPhotons (struct PhotonMap *pmap);
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/* Initialise NN search queue prior to calling kdT_FindPhotons() */
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void OOC_FindPhotons (struct PhotonMap* pmap, const FVECT pos,
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const FVECT norm);
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/* Locate pmap -> squeue.len nearest photons to pos with similar normal
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* (NULL for volume photons) and return in search queue pmap -> squeue,
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* starting with the further photon at pmap -> squeue.node */
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void OOC_Find1Photon (struct PhotonMap* pmap, const FVECT pos,
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const FVECT norm, Photon *photon);
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/* Locate single nearest photon to pos with similar normal */
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int OOC_GetPhoton (struct PhotonMap *pmap, PhotonIdx idx,
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Photon *photon);
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/* Retrieve photon referenced by idx from leaf file and return 0 on
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* success, else -1. */
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Photon *OOC_GetNearestPhoton (const PhotonSearchQueue *squeue,
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PhotonIdx idx);
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/* Retrieve photon from NN search queue after OOC_FindPhotons() */
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PhotonIdx OOC_FirstPhoton (const struct PhotonMap* pmap);
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/* Return index to first photon in octree */
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#endif
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