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/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
*/
/*
* sorter.c++
*
*/
#include "glimports.h"
#include "sorter.h"
#include "mystdio.h"
Sorter::Sorter( int _es )
{
es = _es;
}
void
Sorter::qsort( void *a, int n )
{
qs1( (char *)a, ((char *)a)+n*es);
}
int
Sorter::qscmp( char *, char * )
{
_glu_dprintf( "Sorter::qscmp: pure virtual called\n" );
return 0;
}
void
Sorter::qsexc( char *, char * )
{
_glu_dprintf( "Sorter::qsexc: pure virtual called\n" );
}
void
Sorter::qstexc( char *, char *, char * )
{
_glu_dprintf( "Sorter::qstexc: pure virtual called\n" );
}
void
Sorter::qs1( char *a, char *l )
{
char *i, *j;
char *lp, *hp;
int c;
unsigned int n;
start:
if((n=l-a) <= (unsigned int)es)
return;
n = es * (n / (2*es));
hp = lp = a+n;
i = a;
j = l-es;
while(1) {
if(i < lp) {
if((c = qscmp(i, lp)) == 0) {
qsexc(i, lp -= es);
continue;
}
if(c < 0) {
i += es;
continue;
}
}
loop:
if(j > hp) {
if((c = qscmp(hp, j)) == 0) {
qsexc(hp += es, j);
goto loop;
}
if(c > 0) {
if(i == lp) {
qstexc(i, hp += es, j);
i = lp += es;
goto loop;
}
qsexc(i, j);
j -= es;
i += es;
continue;
}
j -= es;
goto loop;
}
if(i == lp) {
if(lp-a >= l-hp) {
qs1(hp+es, l);
l = lp;
} else {
qs1(a, lp);
a = hp+es;
}
goto start;
}
qstexc(j, lp -= es, i);
j = hp -= es;
}
}
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