src/glu/sgi/libnurbs/internals/bin.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  * bin.c++
  37  *
  38  */
  39
  40 #include "glimports.h"
  41 #include "mystdio.h"
  42 #include "myassert.h"
  43 #include "bin.h"
  44
  45 /*----------------------------------------------------------------------------
  46  * Constructor and destructor
  47  *----------------------------------------------------------------------------
  48  */
  49 Bin::Bin()
  50 {
  51     head = NULL;
  52     current = NULL;
  53 }
  54
  55 Bin::~Bin()
  56 {
  57     assert( head == NULL);
  58 }
  59
  60 /*----------------------------------------------------------------------------
  61  * remove_this_arc - remove given Arc_ptr from bin
  62  *----------------------------------------------------------------------------
  63  */
  64
  65 void
  66 Bin::remove_this_arc( Arc_ptr arc )
  67 {
  68     Arc_ptr *j;
  69     for( j = &(head); (*j != 0) && (*j != arc); j = &((*j)->link) );
  70
  71     if( *j != 0 ) {
  72         if( *j == current )
  73             current = (*j)->link;
  74         *j = (*j)->link;
  75     }
  76 }
  77
  78 /*----------------------------------------------------------------------------
  79  * numarcs - count number of arcs in bin
  80  *----------------------------------------------------------------------------
  81  */
  82
  83 int
  84 Bin::numarcs()
  85 {
  86     long count = 0;
  87     for( Arc_ptr jarc = firstarc(); jarc; jarc = nextarc() )
  88         count++;
  89     return count;
  90 }
  91
  92 /*----------------------------------------------------------------------------
  93  * adopt - place an orphaned arcs into their new parents bin
  94  *----------------------------------------------------------------------------
  95  */
  96
  97 void
  98 Bin::adopt()
  99 {
 100     markall();
 101
 102     Arc_ptr orphan;
 103     while( (orphan = removearc()) != NULL ) {
 104         for( Arc_ptr parent = orphan->next; parent != orphan; parent = parent->next ) {
 105             if (! parent->ismarked() ) {
 106                 orphan->link = parent->link;
 107                 parent->link = orphan;
 108                 orphan->clearmark();
 109                 break;
 110             }
 111         }
 112     }
 113 }
 114
 115
 116 /*----------------------------------------------------------------------------
 117  * show - print out descriptions of the arcs in the bin
 118  *----------------------------------------------------------------------------
 119  */
 120
 121 void
 122 Bin::show( const char *name )
 123 {
 124 #ifndef NDEBUG
 125     _glu_dprintf( "%s\n", name );
 126     for( Arc_ptr jarc = firstarc(); jarc; jarc = nextarc() )
 127         jarc->show( );
 128 #endif
 129 }
 130
 131
 132
 133 /*----------------------------------------------------------------------------
 134  * markall - mark all arcs with an identifying tag
 135  *----------------------------------------------------------------------------
 136  */
 137
 138 void
 139 Bin::markall()
 140 {
 141     for( Arc_ptr jarc=firstarc(); jarc; jarc=nextarc() )
 142         jarc->setmark();
 143 }
 144
 145 /*----------------------------------------------------------------------------
 146  * listBezier - print out all arcs that are untessellated border arcs
 147  *----------------------------------------------------------------------------
 148  */
 149
 150 void
 151 Bin::listBezier( void )
 152 {
 153     for( Arc_ptr jarc=firstarc(); jarc; jarc=nextarc() ) {
 154         if( jarc->isbezier( ) ) {
 155             assert( jarc->pwlArc->npts == 2 );
 156 #ifndef NDEBUG
 157             TrimVertex  *pts = jarc->pwlArc->pts;
 158             REAL s1 = pts[0].param[0];
 159             REAL t1 = pts[0].param[1];
 160             REAL s2 = pts[1].param[0];
 161             REAL t2 = pts[1].param[1];
 162            _glu_dprintf( "arc (%g,%g) (%g,%g)\n", s1, t1, s2, t2 );
 163 #endif
 164         }
 165     }
 166 }
 167