src/glu/sgi/libnurbs/internals/hull.h

   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  * hull.h
  37  *
  38  */
  39
  40 #ifndef __gluhull_h_
  41 #define __gluhull_h_
  42
  43 #include "trimline.h"
  44 #include "trimregion.h"
  45 #include "trimvertex.h"
  46 #include "gridtrimvertex.h"
  47
  48 struct Gridline;
  49 class Uarray;
  50
  51 class Hull : virtual public TrimRegion {
  52 public:
  53                         Hull( void );
  54                         ~Hull( void );
  55     void                init( void );
  56     GridTrimVertex *    nextlower( GridTrimVertex * );
  57     GridTrimVertex *    nextupper( GridTrimVertex * );
  58 private:
  59     struct Side {
  60         Trimline        *left;
  61         Gridline        *line;
  62         Trimline        *right;
  63         long            index;
  64     };
  65
  66     Side                lower;
  67     Side                upper;
  68     Trimline            fakeleft;
  69     Trimline            fakeright;
  70 };
  71
  72
  73 #endif /* __gluhull_h_ */