IABSD.fr/xenocara/lib/libGLU/src/libnurbs/internals/curvesub.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/curvesub.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.
  */
  
  /*
   * curvesub.c++
   *
   */
  
  #include "glimports.h"
  #include "myassert.h"
  #include "mystdio.h"
  #include "subdivider.h"
  #include "renderhints.h"
  #include "backend.h"
  #include "quilt.h"
  #include "curvelist.h"
  #include "nurbsconsts.h"
  
  /*--------------------------------------------------------------------------
   * drawCurves - main curve rendering entry point
   *--------------------------------------------------------------------------
   */
  
  void
  Subdivider::drawCurves( void )
  {
      REAL 	from[1], to[1];
      Flist	bpts;
      qlist->getRange( from, to, bpts );
  
      renderhints.init( );
  
      backend.bgncurv();
      for( int i=bpts.start; i<bpts.end-1; i++ ) {
          REAL pta, ptb;
  	pta = bpts.pts[i];
  	ptb = bpts.pts[i+1];
  
  	qlist->downloadAll( &pta, &ptb, backend );
  
  	Curvelist curvelist( qlist, pta, ptb );
  	samplingSplit( curvelist, renderhints.maxsubdivisions );
      }
      backend.endcurv();
  }
  
  
  /*--------------------------------------------------------------------------
   * samplingSplit - recursively subdivide patch, cull check each subpatch  
   *--------------------------------------------------------------------------
   */
  
  void
  Subdivider::samplingSplit( Curvelist& curvelist, int subdivisions )
  {
      if( curvelist.cullCheck() == CULL_TRIVIAL_REJECT )  return;
  
      curvelist.getstepsize();
  
      if( curvelist.needsSamplingSubdivision() && (subdivisions > 0) ) {
  	REAL mid = ( curvelist.range[0] + curvelist.range[1] ) * 0.5;
  	Curvelist lowerlist( curvelist, mid );
  	samplingSplit( lowerlist, subdivisions-1 ); // lower
  	samplingSplit( curvelist, subdivisions-1 ); // upper
      } else {
  	long nu = 1 + ((long) (curvelist.range[2] / curvelist.stepsize));
  	backend.curvgrid( curvelist.range[0], curvelist.range[1], nu );
  	backend.curvmesh( 0, nu );
      }
  }