| 1 |
/* |
| 2 |
======================================================================= |
| 3 |
Routines for building out-of-core octree data structure |
| 4 |
|
| 5 |
Adapted from: Kontkanen J., Tabellion E. and Overbeck R.S., |
| 6 |
"Coherent Out-of-Core Point-Based Global Illumination", |
| 7 |
EGSR 2011. |
| 8 |
|
| 9 |
Roland Schregle (roland.schregle@{hslu.ch, gmail.com}) |
| 10 |
(c) Fraunhofer Institute for Solar Energy Systems, |
| 11 |
Lucerne University of Applied Sciences & Arts |
| 12 |
======================================================================= |
| 13 |
|
| 14 |
$Id$ |
| 15 |
*/ |
| 16 |
|
| 17 |
|
| 18 |
#include "oococt.h" |
| 19 |
#include "oocsort.h" |
| 20 |
|
| 21 |
|
| 22 |
/* Test for empty/full input queue, return pointer to head/tail */ |
| 23 |
#define QueueFull(q) ((q) -> len == (q) -> cap) |
| 24 |
#define QueueEmpty(q) (!(q) -> len) |
| 25 |
#define QueueHead(q) ((q) -> data + (q) -> head * (q) -> recSize) |
| 26 |
#define QueueTail(q) ((q) -> data + \ |
| 27 |
(q) -> head + (q) -> len - 1) * (q) -> recSize) |
| 28 |
|
| 29 |
|
| 30 |
/* Input queue from heap */ |
| 31 |
type struct { |
| 32 |
void *data = NULL; |
| 33 |
/* Queue head, length (from head), capacity and record size */ |
| 34 |
unsigned head, len, cap, recSize; |
| 35 |
} OOC_BuildQueue; |
| 36 |
|
| 37 |
|
| 38 |
static OOC_BuildQueue *QueueInit (OOC_BuildQueue *q, unsigned recSize, |
| 39 |
unsigned capacity) |
| 40 |
/* Initialise queue of #capacity records of size recSize each; returns queue |
| 41 |
* pointer or NULL if failed. */ |
| 42 |
{ |
| 43 |
if (!(q && (q -> data = calloc(capacity, recSize)))) |
| 44 |
return NULL; |
| 45 |
|
| 46 |
q -> cap = capacity; |
| 47 |
q -> recSize = recSize; |
| 48 |
q -> head = q -> len = 0; |
| 49 |
|
| 50 |
return q; |
| 51 |
} |
| 52 |
|
| 53 |
|
| 54 |
static int QueuePush (OOC_BuildQueue *q, const void *rec) |
| 55 |
/* Append record to queue tail; returns new queue length or -1 on failure */ |
| 56 |
{ |
| 57 |
int tail; |
| 58 |
|
| 59 |
if (!q || !rec) |
| 60 |
return -1; |
| 61 |
|
| 62 |
if (q -> len >= q -> cap) |
| 63 |
/* Queue full */ |
| 64 |
return -1; |
| 65 |
|
| 66 |
tail = (q -> head + q-> len++) % q -> cap; |
| 67 |
memcpy(q -> data + tail * q -> recSize, rec, q -> recSize); |
| 68 |
|
| 69 |
return q -> len; |
| 70 |
} |
| 71 |
|
| 72 |
|
| 73 |
static int QueuePop (OOC_BuildQueue *q, void *rec) |
| 74 |
/* Remove record from queue head; returns new queue length or -1 on failure */ |
| 75 |
{ |
| 76 |
if (!q || !rec) |
| 77 |
return -1; |
| 78 |
|
| 79 |
if (!q -> len) |
| 80 |
/* Queue empty */ |
| 81 |
return -1; |
| 82 |
|
| 83 |
memcpy(rev, q -> data + q -> head * q -> recSize, q -> recSize); |
| 84 |
q -> head = (q -> head + 1) % q -> cap; |
| 85 |
|
| 86 |
return --q -> len; |
| 87 |
} |
| 88 |
|
| 89 |
|
| 90 |
static OOC_Idx *OOC_BuildRecurse (OOC_Octree *oct, OOC_Node *node, |
| 91 |
FVECT org, RREAL size, unsigned depth, |
| 92 |
OOC_Queue *queue, FILE *heapFile, |
| 93 |
FILE *nodeFile, FILE *leafFile) |
| 94 |
/* Recursive part of OOC_Build(); insert records from input queue into |
| 95 |
* octree node and subdivide if necessary. Returns number of records in |
| 96 |
* subtree. */ |
| 97 |
{ |
| 98 |
if (QueueEmpty(queue) || !InNode(QueueHead(queue))) |
| 99 |
/* Input exhausted or queue head outside node */ |
| 100 |
return 0; |
| 101 |
|
| 102 |
if (InNode(QueueTail(queue)) && QueueFull(queue) && |
| 103 |
depth < oct -> maxDepth) { |
| 104 |
|
| 105 |
} |
| 106 |
else { |
| 107 |
|
| 108 |
} |
| 109 |
} |
| 110 |
|
| 111 |
|
| 112 |
OOC_Octree *OOC_Build (OOC_Octree *oct, unsigned recSize, unsigned leafMax, |
| 113 |
unsigned maxDepth, const char *heapFileName, |
| 114 |
const char *nodeFileName, const char *leafFileName) |
| 115 |
/* Build out-of-core octree from unsorted records of size recSize in |
| 116 |
* heapFileName, such that leaves contain <= leafMax records, except those |
| 117 |
* at maxDepth. Nodes and leaves are output separately to nodeFileName and leafFileName, |
| 118 |
* respectively. Returns octree pointer on success, else NULL. */ |
| 119 |
{ |
| 120 |
OOC_BuildQueue queue; |
| 121 |
void *rec = malloc(recSize); |
| 122 |
FILE *heapFile = fopen(heapFileName, "rb"), |
| 123 |
*nodeFile = fopen(nodeFileName, "wb"), |
| 124 |
*leafFile = fopen(leafFileName, "wb"); |
| 125 |
|
| 126 |
if (OOC_Init(oct, recSize, leafMax, maxDepth) < 0) { |
| 127 |
perror("OOC_Build: failed octree init"); |
| 128 |
return NULL; |
| 129 |
} |
| 130 |
|
| 131 |
if (!heapFile) { |
| 132 |
perror("OOC_Build: failed opening heap file"); |
| 133 |
return NULL; |
| 134 |
} |
| 135 |
|
| 136 |
if (!nodeFile || !leafFile) { |
| 137 |
perror("OOC_Build: failed opening node/leaf output file"); |
| 138 |
return NULL; |
| 139 |
} |
| 140 |
|
| 141 |
/* Init and fill queue from heap file */ |
| 142 |
if (!rec || !QueueInit(&queue, recSize, leafMax + 1)) { |
| 143 |
perror("OOC_Build: failed input queue init"); |
| 144 |
return NULL; |
| 145 |
} |
| 146 |
|
| 147 |
do { |
| 148 |
if (feof(heapFile) || !fread(rec, recSize, 1, heapFile)) { |
| 149 |
perror("OOC_Build: failed reading from heap file"); |
| 150 |
|
| 151 |
QueuePush(&queue, rec); |
| 152 |
} while (!QueueFull(&queue)); |
| 153 |
|
| 154 |
if (!OOC_BuildRecurse(oct, oct -> root, queue, |
| 155 |
heapFile, nodeFile, leafFile)) |
| 156 |
return NULL; |
| 157 |
|
| 158 |
fclose(heapFile); |
| 159 |
fclose(nodeFile); |
| 160 |
fclose(leafFile); |
| 161 |
|
| 162 |
return oct; |
| 163 |
} |
