IABSD.fr/xenocara/lib/libGLU/src/libnurbs/internals/curvelist.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/curvelist.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.
  */
  
  /*
   * curvelist.c++
   *
   */
  
  #include "glimports.h"
  #include "myassert.h"
  #include "mystdio.h"
  #include "quilt.h"
  #include "curvelist.h"
  #include "curve.h"
  #include "types.h"
  
  Curvelist::Curvelist( Quilt *quilts, REAL pta, REAL ptb )
  {
      curve = 0;
      for( Quilt *q = quilts; q; q = q->next ) 
  	curve = new Curve( q, pta, ptb, curve );
      range[0] = pta;
      range[1] = ptb;
      range[2] = ptb - pta;
      needsSubdivision = 0;
      stepsize = 0;
  }
  
  Curvelist::Curvelist( Curvelist &upper, REAL value )
  {
      curve = 0;
      for( Curve *c = upper.curve; c; c = c->next )
  	curve = new Curve( *c, value, curve );
  
      range[0] = upper.range[0];
      range[1] = value;
      range[2] = value - upper.range[0];
      upper.range[0] = value;
      upper.range[2] = upper.range[1] - value;
      needsSubdivision = 0;
      stepsize = 0;
  }
  
  Curvelist::~Curvelist()
  {
      while( curve ) {
  	Curve *c = curve;
  	curve = curve->next;
  	delete c;
      }
  }
  
  int
  Curvelist::cullCheck( void )
  {
      for( Curve *c = curve; c; c = c->next )
  	if( c->cullCheck() == CULL_TRIVIAL_REJECT )
  	    return CULL_TRIVIAL_REJECT;
      return CULL_ACCEPT;
  }
  
  void
  Curvelist::getstepsize( void )
  {
      stepsize = range[2];
      Curve *c;
      for( c = curve; c; c = c->next ) {
  	c->getstepsize();
  	c->clamp();
  	stepsize =  ((c->stepsize < stepsize) ? c->stepsize : stepsize);
  	if( c->needsSamplingSubdivision() ) break;
      }
      needsSubdivision = ( c ) ? 1 : 0;
  }
  
  int
  Curvelist::needsSamplingSubdivision( void )
  {
      return needsSubdivision;
  }