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RadiancePmap/oocsort.h
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oocsort.h
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/*
======================================================================
Header for N-way out-of-core merge sort for records with 3D keys.
Roland Schregle (roland.schregle@{hslu.ch, gmail.com})
(c) Lucerne University of Applied Sciences and Arts,
supported by the Swiss National Science Foundation (SNSF, #147053)
======================================================================
$Id: oocsort.h,v 2.3 2016/05/17 17:39:47 rschregle Exp $
*/
#ifndef OOC_SORT_H
#define OOC_SORT_H
#include "fvect.h"
#include <stdio.h>
/* Sort records in inFile and append to outFile by subdividing inFile
* into small blocks, sorting these in-core, and merging them out-of-core
* via a priority queue.
*
* This is implemented as a recursive (numBlk)-way sort; the input is
* successively split into numBlk smaller blocks until these are of size
* <= blkSize, i.e. small enough for in-core sorting, then merging the
* sorted blocks as the stack unwinds. The in-core sort is parallelised
* over numProc processes.
*
* Parameters are as follows:
* inFile Opened input file containing unsorted records
* outFile Opened output file containing sorted records
* numBlk Number of blocks to divide into / merge from
* blkSize Max block size and size of in-core sort buffer, in bytes
* numProc Number of parallel processes for in-core sort
* recSize Size of input records in bytes
* bbOrg Origin of bounding box containing record keys for Morton code
* bbSize Extent of bounding box containing record keys for Morton code
* key Callback to access 3D coords from records for Morton code
*/
int OOC_Sort (FILE *inFile, FILE *outFile, unsigned numBlk,
unsigned long blkSize, unsigned numProc, unsigned recSize,
FVECT bbOrg, RREAL bbSize, RREAL *(*key)(const void*));
#endif
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