| 1 |
rschregle |
1.1 |
/*
|
| 2 |
|
|
==================================================================
|
| 3 |
|
|
In-core kd-tree for photon map
|
| 4 |
|
|
|
| 5 |
|
|
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
|
| 6 |
|
|
(c) Fraunhofer Institute for Solar Energy Systems,
|
| 7 |
|
|
(c) Lucerne University of Applied Sciences and Arts,
|
| 8 |
|
|
supported by the Swiss National Science Foundation (SNSF, #147053)
|
| 9 |
|
|
==================================================================
|
| 10 |
|
|
|
| 11 |
|
|
$Id: pmapkdt.h,v 1.2 2015/11/13 17:31:25 taschreg Exp taschreg $
|
| 12 |
|
|
*/
|
| 13 |
|
|
|
| 14 |
|
|
|
| 15 |
|
|
#ifndef PMAPKDT_H
|
| 16 |
|
|
#define PMAPKDT_H
|
| 17 |
|
|
|
| 18 |
|
|
/* #include <stdio.h>
|
| 19 |
|
|
#include "fvect.h" */
|
| 20 |
|
|
#include "pmapdata.h"
|
| 21 |
|
|
|
| 22 |
|
|
|
| 23 |
|
|
/* Forward declarations to break dependency loop with pmapdata.h */
|
| 24 |
|
|
struct PhotonMap;
|
| 25 |
|
|
|
| 26 |
|
|
|
| 27 |
|
|
/* k-d tree as linear array of photons */
|
| 28 |
|
|
typedef struct {
|
| 29 |
|
|
Photon *nodes; /* k-d tree as linear array */
|
| 30 |
|
|
} PhotonKdTree;
|
| 31 |
|
|
|
| 32 |
|
|
typedef PhotonKdTree PhotonStorage;
|
| 33 |
|
|
typedef Photon* PhotonIdx;
|
| 34 |
|
|
|
| 35 |
|
|
/* Priority queue node for kd-tree lookups */
|
| 36 |
|
|
typedef struct {
|
| 37 |
|
|
PhotonIdx idx; /* Pointer to photon */
|
| 38 |
|
|
float dist2; /* Photon's SQUARED distance to query point */
|
| 39 |
|
|
} kdT_SearchQueueNode;
|
| 40 |
|
|
|
| 41 |
|
|
typedef struct {
|
| 42 |
|
|
kdT_SearchQueueNode *node;
|
| 43 |
|
|
unsigned len, tail;
|
| 44 |
|
|
} kdT_SearchQueue;
|
| 45 |
|
|
|
| 46 |
|
|
typedef kdT_SearchQueueNode PhotonSearchQueueNode;
|
| 47 |
|
|
typedef kdT_SearchQueue PhotonSearchQueue;
|
| 48 |
|
|
|
| 49 |
|
|
|
| 50 |
|
|
|
| 51 |
|
|
void kdT_Null (PhotonKdTree *kdt);
|
| 52 |
|
|
/* Initialise kd-tree prior to storing photons */
|
| 53 |
|
|
|
| 54 |
|
|
void kdT_BuildPhotonMap (struct PhotonMap *pmap);
|
| 55 |
|
|
/* Build a balanced kd-tree pmap -> store from photons in unsorted
|
| 56 |
|
|
* heapfile pmap -> heap to guarantee logarithmic search times. The heap
|
| 57 |
|
|
* is destroyed on return. */
|
| 58 |
|
|
|
| 59 |
|
|
int kdT_SavePhotons (const struct PhotonMap *pmap, FILE *out);
|
| 60 |
|
|
/* Save photons in kd-tree to file. Return -1 on error, else 0 */
|
| 61 |
|
|
|
| 62 |
|
|
int kdT_LoadPhotons (struct PhotonMap *pmap, FILE *in);
|
| 63 |
|
|
/* Load photons in kd-tree from file. Return -1 on error, else 0 */
|
| 64 |
|
|
|
| 65 |
|
|
void kdT_InitFindPhotons (struct PhotonMap *pmap);
|
| 66 |
|
|
/* Initialise NN search queue prior to calling kdT_FindPhotons() */
|
| 67 |
|
|
|
| 68 |
|
|
void kdT_FindPhotons (struct PhotonMap* pmap, const FVECT pos,
|
| 69 |
|
|
const FVECT norm);
|
| 70 |
|
|
/* Locate pmap -> squeue.len nearest photons to pos with similar normal
|
| 71 |
|
|
* (NULL for volume photons) and return in search queue pmap -> squeue,
|
| 72 |
|
|
* starting with the further photon at pmap -> squeue.node */
|
| 73 |
|
|
|
| 74 |
|
|
void kdT_Find1Photon (struct PhotonMap* pmap, const FVECT pos,
|
| 75 |
|
|
const FVECT norm, Photon *photon);
|
| 76 |
|
|
/* Locate single nearest photon to pos with similar normal */
|
| 77 |
|
|
|
| 78 |
|
|
int kdT_GetPhoton (const struct PhotonMap *pmap, PhotonIdx idx,
|
| 79 |
|
|
Photon *photon);
|
| 80 |
|
|
/* Retrieve photon referenced by idx from kd-tree and return 0 on
|
| 81 |
|
|
* success, else -1. */
|
| 82 |
|
|
|
| 83 |
|
|
Photon *kdT_GetNearestPhoton (const PhotonSearchQueue *squeue,
|
| 84 |
|
|
PhotonIdx idx);
|
| 85 |
|
|
/* Retrieve photon from NN search queue after OOC_FindPhotons() */
|
| 86 |
|
|
|
| 87 |
|
|
PhotonIdx kdT_FirstPhoton (const struct PhotonMap* pmap);
|
| 88 |
|
|
/* Return pointer to first photon in kd-Tree */
|
| 89 |
|
|
|
| 90 |
|
|
void kdT_Delete (PhotonKdTree *kdt);
|
| 91 |
|
|
/* Self-destruct */
|
| 92 |
|
|
|
| 93 |
|
|
#endif
|
