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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 2020/04/08 15:14:21 rschregle Exp $
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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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#ifdef __cplusplus
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extern "C" {
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#endif
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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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int 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. Return -1
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* if none found, else 0. */
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int 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. Return -1
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* if none found, else 0. */
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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 -1 on
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* error, else 0. */
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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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#ifdef __cplusplus
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}
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#endif
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#endif
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