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

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• Author : jsg
  Date : 2019-11-27 10:26:12
  Hash : f42e66cb
  Message : update to GLU 9.0.1 Among other minor changes this adds a stddef.h include for NULL required to build with Mesa 19.2 headers.

• lib/libGLU/src/libnurbs/internals/hull.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.
  */
  
  /*
   * hull.c++
   *
   */
  
  #include "glimports.h"
  #include "myassert.h"
  #include "mystdio.h"
  #include "hull.h"
  #include "gridvertex.h"
  #include "gridtrimvertex.h"
  #include "gridline.h"
  #include "trimline.h"
  #include "uarray.h"
  #include "trimregion.h"
  
  Hull::Hull( void )
  {}
  
  Hull::~Hull( void )
  {}
  
  /*----------------------------------------------------------------------
   * Hull:init - this routine does the initialization needed before any
   *	 	calls to nextupper or nextlower can be made.
   *----------------------------------------------------------------------
   */
  void
  Hull::init( void )
  {
      TrimVertex *lfirst = left.first();
      TrimVertex *llast = left.last();
      if( lfirst->param[0] <= llast->param[0] ) {
  	fakeleft.init( left.first() );
  	upper.left = &fakeleft;
  	lower.left = &left;
      } else {
  	fakeleft.init( left.last() );
  	lower.left = &fakeleft;
   	upper.left = &left;
      }
      upper.left->last();
      lower.left->first();
  
      if( top.ustart <= top.uend ) {
  	upper.line = &top;
  	upper.index = top.ustart;
      } else
  	upper.line = 0;
  
      if( bot.ustart <= bot.uend ) {
  	lower.line = &bot;
  	lower.index = bot.ustart;
      } else
  	lower.line = 0;
  
      TrimVertex *rfirst = right.first();
      TrimVertex *rlast = right.last();
      if( rfirst->param[0] <= rlast->param[0] ) {
  	fakeright.init( right.last() );
  	lower.right = &fakeright;
  	upper.right = &right;
      } else {
  	fakeright.init( right.first() );
  	upper.right = &fakeright;
  	lower.right = &right;
      }
      upper.right->first();
      lower.right->last();
  }
  
  /*----------------------------------------------------------------------
   * nextupper - find next vertex on upper hull of trim region.
   *		 - if vertex is on trim curve, set vtop point to 
   *		   that vertex.  if vertex is on grid, set vtop to
   *		   point to temporary area and stuff coordinants into
   *		   temporary vertex.  Also, place grid coords in temporary
   *		   grid vertex.
   *----------------------------------------------------------------------
   */
  GridTrimVertex *
  Hull::nextupper( GridTrimVertex *gv )
  {
      if( upper.left ) {
  	gv->set( upper.left->prev() );
  	if( gv->isTrimVert() ) return gv;
  	upper.left = 0;
      } 
  
      if( upper.line ) {
  	assert( upper.index <= upper.line->uend );
  	gv->set( uarray.uarray[upper.index], upper.line->vval );
  	gv->set( upper.index, upper.line->vindex );
  	if( upper.index++ == upper.line->uend ) upper.line = 0;
  	return gv; 
      } 
  
      if( upper.right ) {
  	gv->set( upper.right->next() );
  	if( gv->isTrimVert() ) return gv;
  	upper.right = 0;
      } 
  
      return 0; 
  }
  
  GridTrimVertex *
  Hull::nextlower( GridTrimVertex *gv )
  {
      if( lower.left ) {
  	gv->set( lower.left->next() );
  	if( gv->isTrimVert() ) return gv;
  	lower.left = 0;
      } 
  
      if( lower.line ) {
  	gv->set( uarray.uarray[lower.index], lower.line->vval );
  	gv->set( lower.index, lower.line->vindex );
  	if( lower.index++ == lower.line->uend ) lower.line = 0;
  	return gv;
      } 
  
      if( lower.right ) {
  	gv->set( lower.right->prev() );
  	if( gv->isTrimVert() ) return gv;
  	lower.right = 0;
      } 
  
      return 0;
  }