src/glu/sgi/libnurbs/internals/trimregion.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  * trimregion.h
  37  *
  38  */
  39
  40 #ifndef __glutrimregion_h_
  41 #define __glutrimregion_h_
  42
  43 #include "trimline.h"
  44 #include "gridline.h"
  45 #include "uarray.h"
  46
  47 class Arc;
  48 class Backend;
  49
  50 class TrimRegion {
  51 public:
  52                         TrimRegion();
  53     Trimline            left;
  54     Trimline            right;
  55     Gridline            top;
  56     Gridline            bot;
  57     Uarray              uarray;
  58
  59     void                init( REAL );
  60     void                advance( REAL, REAL, REAL );
  61     void                setDu( REAL );
  62     void                init( long, Arc_ptr );
  63     void                getPts( Arc_ptr );
  64     void                getPts( Backend & );
  65     void                getGridExtent( TrimVertex *, TrimVertex * );
  66     void                getGridExtent( void );
  67     int                 canTile( void );
  68 private:
  69     REAL                oneOverDu;
  70 };
  71
  72 inline void
  73 TrimRegion::init( REAL vval )
  74 {
  75     bot.vval = vval;
  76 }
  77
  78 inline void
  79 TrimRegion::advance( REAL topVindex, REAL botVindex, REAL botVval )
  80 {
  81     top.vindex  = (long) topVindex;
  82     bot.vindex  = (long) botVindex;
  83     top.vval    = bot.vval;
  84     bot.vval    = botVval;
  85     top.ustart  = bot.ustart;
  86     top.uend    = bot.uend;
  87 }
  88 #endif /* __glutrimregion_h_ */