dll/opengl/glu32/src/libnurbs/internals/patch.h

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  21  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Except as contained in this notice, the name of Silicon Graphics, Inc.
  26  * shall not be used in advertising or otherwise to promote the sale, use or
  27  * other dealings in this Software without prior written authorization from
  28  * Silicon Graphics, Inc.
  29  */
  30
  31 /*
  32  * patch.h
  33  *
  34  */
  35
  36 #ifndef __glupatch_h_
  37 #define __glupatch_h_
  38
  39 #include "types.h"
  40 #include "defines.h"
  41
  42 class Quilt;
  43 class Mapdesc;
  44
  45
  46 struct Pspec {
  47     REAL                range[3];
  48     REAL                sidestep[2];
  49     REAL                stepsize;
  50     REAL                minstepsize;
  51     int                 needsSubdivision;
  52 };
  53
  54 struct Patchspec : public Pspec {
  55     int                 order;
  56     int                 stride;
  57     void                clamp( REAL );
  58     void                getstepsize( REAL );
  59     void                singleStep( void );
  60 };
  61
  62 class Patch {
  63 public:
  64 friend class Subdivider;
  65 friend class Quilt;
  66 friend class Patchlist;
  67                         Patch( Quilt *, REAL*, REAL *, Patch * );
  68                         Patch( Patch &, int, REAL, Patch * );
  69     void                bbox( void );
  70     void                clamp( void );
  71     void                getstepsize( void );
  72     int                 cullCheck( void );
  73     int                 needsSubdivision( int );
  74     int                 needsSamplingSubdivision( void );
  75     int                 needsNonSamplingSubdivision( void );
  76
  77     int                 get_uorder() {return pspec[0].order;}
  78     int                 get_vorder() {return pspec[1].order;}
  79
  80 private:
  81
  82     Mapdesc*            mapdesc;
  83     Patch*              next;
  84     int                 cullval;
  85     int                 notInBbox;
  86     int                 needsSampling;
  87     REAL                cpts[MAXORDER*MAXORDER*MAXCOORDS]; //culling pts
  88     REAL                spts[MAXORDER*MAXORDER*MAXCOORDS]; //sampling pts
  89     REAL                bpts[MAXORDER*MAXORDER*MAXCOORDS]; //bbox pts
  90     Patchspec           pspec[2];
  91     void                checkBboxConstraint( void );
  92     REAL                bb[2][MAXCOORDS];
  93 };
  94 #endif /* __glupatch_h_ */