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Diffstat (limited to 'src/glu/sgi/libnurbs/internals/arcsorter.cc')
| -rw-r--r-- | src/glu/sgi/libnurbs/internals/arcsorter.cc | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/glu/sgi/libnurbs/internals/arcsorter.cc b/src/glu/sgi/libnurbs/internals/arcsorter.cc new file mode 100644 index 00000000000..0737569a0dc --- /dev/null +++ b/src/glu/sgi/libnurbs/internals/arcsorter.cc @@ -0,0 +1,174 @@ +/* +** 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. +*/ + +/* + * arcsorter.c++ + * + * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $ + * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/arcsorter.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $ + */ + +#ifndef __gluarcsorter_c_ +#define __gluarcsorter_c_ + +#include "glimports.h" +#include "arc.h" +#include "arcsorter.h" +#include "subdivider.h" + +ArcSorter::ArcSorter(Subdivider &s) : Sorter( sizeof( Arc ** ) ), subdivider(s) +{ +} + +int +ArcSorter::qscmp( char *, char * ) +{ + dprintf( "ArcSorter::qscmp: pure virtual called\n" ); + return 0; +} + +void +ArcSorter::qsort( Arc **a, int n ) +{ + Sorter::qsort( (void *) a, n ); +} + +void +ArcSorter::qsexc( char *i, char *j )// i<-j, j<-i +{ + Arc **jarc1 = (Arc **) i; + Arc **jarc2 = (Arc **) j; + Arc *tmp = *jarc1; + *jarc1 = *jarc2; + *jarc2 = tmp; +} + +void +ArcSorter::qstexc( char *i, char *j, char *k )// i<-k, k<-j, j<-i +{ + Arc **jarc1 = (Arc **) i; + Arc **jarc2 = (Arc **) j; + Arc **jarc3 = (Arc **) k; + Arc *tmp = *jarc1; + *jarc1 = *jarc3; + *jarc3 = *jarc2; + *jarc2 = tmp; +} + + +ArcSdirSorter::ArcSdirSorter( Subdivider &s ) : ArcSorter(s) +{ +} + +int +ArcSdirSorter::qscmp( char *i, char *j ) +{ + Arc *jarc1 = *(Arc **) i; + Arc *jarc2 = *(Arc **) j; + + int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1)); + int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1)); + + REAL diff = jarc1->pwlArc->pts[v1].param[1] - + jarc2->pwlArc->pts[v2].param[1]; + + if( diff < 0.0) + return -1; + else if( diff > 0.0) + return 1; + else { + if( v1 == 0 ) { + if( jarc2->tail()[0] < jarc1->tail()[0] ) { + return subdivider.ccwTurn_sl( jarc2, jarc1 ) ? 1 : -1; + } else { + return subdivider.ccwTurn_sr( jarc2, jarc1 ) ? -1 : 1; + } + } else { + if( jarc2->head()[0] < jarc1->head()[0] ) { + return subdivider.ccwTurn_sl( jarc1, jarc2 ) ? -1 : 1; + } else { + return subdivider.ccwTurn_sr( jarc1, jarc2 ) ? 1 : -1; + } + } + } +} + +ArcTdirSorter::ArcTdirSorter( Subdivider &s ) : ArcSorter(s) +{ +} + +/*---------------------------------------------------------------------------- + * ArcTdirSorter::qscmp - + * compare two axis monotone arcs that are incident + * to the line T == compare_value. Determine which of the + * two intersects that line with a LESSER S value. If + * jarc1 does, return 1. If jarc2 does, return -1. + *---------------------------------------------------------------------------- + */ +int +ArcTdirSorter::qscmp( char *i, char *j ) +{ + Arc *jarc1 = *(Arc **) i; + Arc *jarc2 = *(Arc **) j; + + int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1)); + int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1)); + + REAL diff = jarc1->pwlArc->pts[v1].param[0] - + jarc2->pwlArc->pts[v2].param[0]; + + if( diff < 0.0) + return 1; + else if( diff > 0.0) + return -1; + else { + if( v1 == 0 ) { + if (jarc2->tail()[1] < jarc1->tail()[1]) { + return subdivider.ccwTurn_tl( jarc2, jarc1 ) ? 1 : -1; + } else { + return subdivider.ccwTurn_tr( jarc2, jarc1 ) ? -1 : 1; + } + } else { + if( jarc2->head()[1] < jarc1->head()[1] ) { + return subdivider.ccwTurn_tl( jarc1, jarc2 ) ? -1 : 1; + } else { + return subdivider.ccwTurn_tr( jarc1, jarc2 ) ? 1 : -1; + } + } + } +} + + + +#endif /* __gluarcsorter_c_ */ |