IABSD.fr/xenocara/lib/libGLU/src/libnurbs/internals/arcsorter.cc

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• Author : jsg
  Date : 2013-09-01 03:51:12
  Hash : 729f7da4
  Message : Update to GLU 9.0.0, GLU was previously part of Mesa but is now seperate. tested in a ports bulk build by landry@, ok matthieu@

• lib/libGLU/src/libnurbs/internals/arcsorter.cc

• /*
  ** 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++
   *
   */
  
  #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 * )
  {
      _glu_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_ */