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/* |
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================================================================== |
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In-core kd-tree for photon map |
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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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(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: pmapkdt.h,v 1.2 2015/11/13 17:31:25 taschreg Exp taschreg $ |
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*/ |
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#ifndef PMAPKDT_H |
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#define PMAPKDT_H |
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/* #include <stdio.h> |
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#include "fvect.h" */ |
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#include "pmapdata.h" |
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/* Forward declarations to break dependency loop with pmapdata.h */ |
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struct PhotonMap; |
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/* k-d tree as linear array of photons */ |
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typedef struct { |
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Photon *nodes; /* k-d tree as linear array */ |
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} PhotonKdTree; |
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typedef PhotonKdTree PhotonStorage; |
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typedef Photon* PhotonIdx; |
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/* Priority queue node for kd-tree lookups */ |
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typedef struct { |
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PhotonIdx idx; /* Pointer to photon */ |
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float dist2; /* Photon's SQUARED distance to query point */ |
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} kdT_SearchQueueNode; |
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typedef struct { |
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kdT_SearchQueueNode *node; |
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unsigned len, tail; |
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} kdT_SearchQueue; |
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typedef kdT_SearchQueueNode PhotonSearchQueueNode; |
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typedef kdT_SearchQueue PhotonSearchQueue; |
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void kdT_Null (PhotonKdTree *kdt); |
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/* Initialise kd-tree prior to storing photons */ |
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void kdT_BuildPhotonMap (struct PhotonMap *pmap); |
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/* Build a balanced kd-tree pmap -> store from photons in unsorted |
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* heapfile pmap -> heap to guarantee logarithmic search times. The heap |
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* is destroyed on return. */ |
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int kdT_SavePhotons (const struct PhotonMap *pmap, FILE *out); |
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/* Save photons in kd-tree to file. Return -1 on error, else 0 */ |
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int kdT_LoadPhotons (struct PhotonMap *pmap, FILE *in); |
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/* Load photons in kd-tree from file. Return -1 on error, else 0 */ |
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void kdT_InitFindPhotons (struct PhotonMap *pmap); |
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/* Initialise NN search queue prior to calling kdT_FindPhotons() */ |
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void kdT_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 kdT_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 kdT_GetPhoton (const struct PhotonMap *pmap, PhotonIdx idx, |
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Photon *photon); |
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/* Retrieve photon referenced by idx from kd-tree and return 0 on |
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* success, else -1. */ |
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Photon *kdT_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 kdT_FirstPhoton (const struct PhotonMap* pmap); |
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/* Return pointer to first photon in kd-Tree */ |
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void kdT_Delete (PhotonKdTree *kdt); |
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/* Self-destruct */ |
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#endif |
