src/glu/sgi/libnurbs/internals/patch.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  * patch.h
  37  *
  38  * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
  39  * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/patch.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
  40  */
  41
  42 #ifndef __glupatch_h_
  43 #define __glupatch_h_
  44
  45 #include "types.h"
  46 #include "defines.h"
  47
  48 class Quilt;
  49 class Mapdesc;
  50
  51
  52 struct Pspec {
  53     REAL                range[3];
  54     REAL                sidestep[2];
  55     REAL                stepsize;
  56     REAL                minstepsize;
  57     int                 needsSubdivision;
  58 };
  59
  60 struct Patchspec : public Pspec {
  61     int                 order;
  62     int                 stride;
  63     void                clamp( REAL );
  64     void                getstepsize( REAL );
  65     void                singleStep( void );
  66 };
  67
  68 class Patch {
  69 public:
  70 friend class Subdivider;
  71 friend class Quilt;
  72 friend class Patchlist;
  73                         Patch( Quilt *, REAL*, REAL *, Patch * );
  74                         Patch( Patch &, int, REAL, Patch * );
  75     void                bbox( void );
  76     void                clamp( void );
  77     void                getstepsize( void );
  78     int                 cullCheck( void );
  79     int                 needsSubdivision( int );
  80     int                 needsSamplingSubdivision( void );
  81     int                 needsNonSamplingSubdivision( void );
  82
  83     int                 get_uorder() {return pspec[0].order;}
  84     int                 get_vorder() {return pspec[1].order;}
  85
  86 private:
  87
  88     Mapdesc*            mapdesc;
  89     Patch*              next;
  90     int                 cullval;
  91     int                 notInBbox;
  92     int                 needsSampling;
  93     REAL                cpts[MAXORDER*MAXORDER*MAXCOORDS]; //culling pts
  94     REAL                spts[MAXORDER*MAXORDER*MAXCOORDS]; //sampling pts
  95     REAL                bpts[MAXORDER*MAXORDER*MAXCOORDS]; //bbox pts
  96     Patchspec           pspec[2];
  97     void                checkBboxConstraint( void );
  98     REAL                bb[2][MAXCOORDS];
  99 };
 100 #endif /* __glupatch_h_ */