dll/opengl/glu32/src/libnurbs/internals/arcsorter.cc

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 */
  34
  35 /*
  36  * arcsorter.c++
  37  *
  38  */
  39
  40 #ifndef __gluarcsorter_c_
  41 #define __gluarcsorter_c_
  42
  43 #include "glimports.h"
  44 #include "arc.h"
  45 #include "arcsorter.h"
  46 #include "subdivider.h"
  47
  48 ArcSorter::ArcSorter(Subdivider &s) : Sorter( sizeof( Arc ** ) ), subdivider(s)
  49 {
  50 }
  51
  52 int
  53 ArcSorter::qscmp( char *, char * )
  54 {
  55     _glu_dprintf( "ArcSorter::qscmp: pure virtual called\n" );
  56     return 0;
  57 }
  58
  59 void
  60 ArcSorter::qsort( Arc **a, int n )
  61 {
  62     Sorter::qsort( (void *) a, n );
  63 }
  64
  65 void
  66 ArcSorter::qsexc( char *i, char *j )// i<-j, j<-i
  67 {
  68     Arc **jarc1 = (Arc **) i;
  69     Arc **jarc2 = (Arc **) j;
  70     Arc *tmp = *jarc1;
  71     *jarc1 = *jarc2;
  72     *jarc2 = tmp;
  73 }
  74
  75 void
  76 ArcSorter::qstexc( char *i, char *j, char *k )// i<-k, k<-j, j<-i
  77 {
  78     Arc **jarc1 = (Arc **) i;
  79     Arc **jarc2 = (Arc **) j;
  80     Arc **jarc3 = (Arc **) k;
  81     Arc *tmp = *jarc1;
  82     *jarc1 = *jarc3;
  83     *jarc3 = *jarc2;
  84     *jarc2 = tmp;
  85 }
  86
  87
  88 ArcSdirSorter::ArcSdirSorter( Subdivider &s ) : ArcSorter(s)
  89 {
  90 }
  91
  92 int
  93 ArcSdirSorter::qscmp( char *i, char *j )
  94 {
  95     Arc *jarc1 = *(Arc **) i;
  96     Arc *jarc2 = *(Arc **) j;
  97
  98     int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
  99     int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
 100
 101     REAL diff =  jarc1->pwlArc->pts[v1].param[1] -
 102                  jarc2->pwlArc->pts[v2].param[1];
 103
 104     if( diff < 0.0)
 105         return -1;
 106     else if( diff > 0.0)
 107         return 1;
 108     else {
 109         if( v1 == 0 ) {
 110             if( jarc2->tail()[0] < jarc1->tail()[0] ) {
 111                 return subdivider.ccwTurn_sl( jarc2, jarc1 ) ? 1 : -1;
 112             } else {
 113                 return subdivider.ccwTurn_sr( jarc2, jarc1 ) ? -1 : 1;
 114             }
 115         } else {
 116             if( jarc2->head()[0] < jarc1->head()[0] ) {
 117                 return subdivider.ccwTurn_sl( jarc1, jarc2 ) ? -1 : 1;
 118             } else {
 119                 return subdivider.ccwTurn_sr( jarc1, jarc2 ) ? 1 : -1;
 120             }
 121         }
 122     }
 123 }
 124
 125 ArcTdirSorter::ArcTdirSorter( Subdivider &s ) : ArcSorter(s)
 126 {
 127 }
 128
 129 /*----------------------------------------------------------------------------
 130  * ArcTdirSorter::qscmp -
 131   *                compare two axis monotone arcs that are incident
 132  *                 to the line T == compare_value. Determine which of the
 133  *                 two intersects that line with a LESSER S value.  If
 134  *                 jarc1 does, return 1.  If jarc2 does, return -1.
 135  *----------------------------------------------------------------------------
 136  */
 137 int
 138 ArcTdirSorter::qscmp( char *i, char *j )
 139 {
 140     Arc *jarc1 = *(Arc **) i;
 141     Arc *jarc2 = *(Arc **) j;
 142
 143     int v1 = (jarc1->getitail() ? 0 : (jarc1->pwlArc->npts - 1));
 144     int v2 = (jarc2->getitail() ? 0 : (jarc2->pwlArc->npts - 1));
 145
 146     REAL diff =  jarc1->pwlArc->pts[v1].param[0] -
 147                  jarc2->pwlArc->pts[v2].param[0];
 148
 149     if( diff < 0.0)
 150         return 1;
 151     else if( diff > 0.0)
 152         return -1;
 153     else {
 154         if( v1 == 0 ) {
 155             if (jarc2->tail()[1] < jarc1->tail()[1]) {
 156                 return subdivider.ccwTurn_tl( jarc2, jarc1 ) ? 1 : -1;
 157             } else {
 158                 return subdivider.ccwTurn_tr( jarc2, jarc1 ) ? -1 : 1;
 159             }
 160         } else {
 161             if( jarc2->head()[1] < jarc1->head()[1] )  {
 162                 return subdivider.ccwTurn_tl( jarc1, jarc2 ) ? -1 : 1;
 163             } else {
 164                 return subdivider.ccwTurn_tr( jarc1, jarc2 ) ? 1 : -1;
 165             }
 166         }
 167     }
 168 }
 169
 170
 171
 172 #endif /* __gluarcsorter_c_ */