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/* |
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======================================================================= |
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Routines for building out-of-core octree data structure |
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|
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Adapted from: Kontkanen J., Tabellion E. and Overbeck R.S., |
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"Coherent Out-of-Core Point-Based Global Illumination", |
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EGSR 2011. |
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|
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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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Lucerne University of Applied Sciences & Arts |
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======================================================================= |
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|
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$Id: oocbuild.c,v 2.1 2015/02/24 19:39:26 greg Exp $ |
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*/ |
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|
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|
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#include "oococt.h" |
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#include "oocsort.h" |
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|
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|
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/* Test for empty/full input queue, return pointer to head/tail */ |
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#define QueueFull(q) ((q) -> len == (q) -> cap) |
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#define QueueEmpty(q) (!(q) -> len) |
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#define QueueHead(q) ((q) -> data + (q) -> head * (q) -> recSize) |
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#define QueueTail(q) ((q) -> data + \ |
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(q) -> head + (q) -> len - 1) * (q) -> recSize) |
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|
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|
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/* Input queue from heap */ |
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type struct { |
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void *data = NULL; |
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/* Queue head, length (from head), capacity and record size */ |
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unsigned head, len, cap, recSize; |
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} OOC_BuildQueue; |
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|
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|
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static OOC_BuildQueue *QueueInit (OOC_BuildQueue *q, unsigned recSize, |
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unsigned capacity) |
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/* Initialise queue of #capacity records of size recSize each; returns queue |
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* pointer or NULL if failed. */ |
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{ |
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if (!(q && (q -> data = calloc(capacity, recSize)))) |
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return NULL; |
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|
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q -> cap = capacity; |
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q -> recSize = recSize; |
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q -> head = q -> len = 0; |
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|
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return q; |
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} |
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|
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|
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static int QueuePush (OOC_BuildQueue *q, const void *rec) |
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/* Append record to queue tail; returns new queue length or -1 on failure */ |
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{ |
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int tail; |
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|
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if (!q || !rec) |
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return -1; |
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|
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if (q -> len >= q -> cap) |
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/* Queue full */ |
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return -1; |
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|
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tail = (q -> head + q-> len++) % q -> cap; |
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memcpy(q -> data + tail * q -> recSize, rec, q -> recSize); |
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|
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return q -> len; |
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} |
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|
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|
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static int QueuePop (OOC_BuildQueue *q, void *rec) |
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/* Remove record from queue head; returns new queue length or -1 on failure */ |
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{ |
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if (!q || !rec) |
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return -1; |
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|
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if (!q -> len) |
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/* Queue empty */ |
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return -1; |
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|
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memcpy(rev, q -> data + q -> head * q -> recSize, q -> recSize); |
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q -> head = (q -> head + 1) % q -> cap; |
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|
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return --q -> len; |
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} |
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|
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|
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static OOC_Idx *OOC_BuildRecurse (OOC_Octree *oct, OOC_Node *node, |
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FVECT org, RREAL size, unsigned depth, |
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OOC_Queue *queue, FILE *heapFile, |
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FILE *nodeFile, FILE *leafFile) |
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/* Recursive part of OOC_Build(); insert records from input queue into |
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* octree node and subdivide if necessary. Returns number of records in |
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* subtree. */ |
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{ |
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if (QueueEmpty(queue) || !InNode(QueueHead(queue))) |
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/* Input exhausted or queue head outside node */ |
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return 0; |
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|
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if (InNode(QueueTail(queue)) && QueueFull(queue) && |
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depth < oct -> maxDepth) { |
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|
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} |
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else { |
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|
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} |
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} |
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|
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|
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OOC_Octree *OOC_Build (OOC_Octree *oct, unsigned recSize, unsigned leafMax, |
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unsigned maxDepth, const char *heapFileName, |
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const char *nodeFileName, const char *leafFileName) |
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/* Build out-of-core octree from unsorted records of size recSize in |
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* heapFileName, such that leaves contain <= leafMax records, except those |
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* at maxDepth. Nodes and leaves are output separately to nodeFileName and leafFileName, |
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* respectively. Returns octree pointer on success, else NULL. */ |
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{ |
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OOC_BuildQueue queue; |
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void *rec = malloc(recSize); |
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FILE *heapFile = fopen(heapFileName, "rb"), |
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*nodeFile = fopen(nodeFileName, "wb"), |
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*leafFile = fopen(leafFileName, "wb"); |
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|
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if (OOC_Init(oct, recSize, leafMax, maxDepth) < 0) { |
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perror("OOC_Build: failed octree init"); |
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return NULL; |
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} |
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|
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if (!heapFile) { |
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perror("OOC_Build: failed opening heap file"); |
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return NULL; |
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} |
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|
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if (!nodeFile || !leafFile) { |
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perror("OOC_Build: failed opening node/leaf output file"); |
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return NULL; |
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} |
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|
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/* Init and fill queue from heap file */ |
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if (!rec || !QueueInit(&queue, recSize, leafMax + 1)) { |
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perror("OOC_Build: failed input queue init"); |
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return NULL; |
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} |
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|
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do { |
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if (feof(heapFile) || !fread(rec, recSize, 1, heapFile)) { |
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perror("OOC_Build: failed reading from heap file"); |
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|
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QueuePush(&queue, rec); |
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} while (!QueueFull(&queue)); |
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|
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if (!OOC_BuildRecurse(oct, oct -> root, queue, |
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heapFile, nodeFile, leafFile)) |
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return NULL; |
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|
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fclose(heapFile); |
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fclose(nodeFile); |
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fclose(leafFile); |
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|
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return oct; |
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} |
