reactos/dll/win32/glu32/libtess/tessmono.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 ** Author: Eric Veach, July 1994.
  37 **
  38 ** $Date$ $Revision: 1.1 $
  39 ** $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libtess/tessmono.h,v 1.1 2004/02/02 16:39:15 navaraf Exp $
  40 */
  41
  42 #ifndef __tessmono_h_
  43 #define __tessmono_h_
  44
  45 /* __gl_meshTessellateMonoRegion( face ) tessellates a monotone region
  46  * (what else would it do??)  The region must consist of a single
  47  * loop of half-edges (see mesh.h) oriented CCW.  "Monotone" in this
  48  * case means that any vertical line intersects the interior of the
  49  * region in a single interval.
  50  *
  51  * Tessellation consists of adding interior edges (actually pairs of
  52  * half-edges), to split the region into non-overlapping triangles.
  53  *
  54  * __gl_meshTessellateInterior( mesh ) tessellates each region of
  55  * the mesh which is marked "inside" the polygon.  Each such region
  56  * must be monotone.
  57  *
  58  * __gl_meshDiscardExterior( mesh ) zaps (ie. sets to NULL) all faces
  59  * which are not marked "inside" the polygon.  Since further mesh operations
  60  * on NULL faces are not allowed, the main purpose is to clean up the
  61  * mesh so that exterior loops are not represented in the data structure.
  62  *
  63  * __gl_meshSetWindingNumber( mesh, value, keepOnlyBoundary ) resets the
  64  * winding numbers on all edges so that regions marked "inside" the
  65  * polygon have a winding number of "value", and regions outside
  66  * have a winding number of 0.
  67  *
  68  * If keepOnlyBoundary is TRUE, it also deletes all edges which do not
  69  * separate an interior region from an exterior one.
  70  */
  71
  72 int __gl_meshTessellateMonoRegion( GLUface *face );
  73 int __gl_meshTessellateInterior( GLUmesh *mesh );
  74 void __gl_meshDiscardExterior( GLUmesh *mesh );
  75 int __gl_meshSetWindingNumber( GLUmesh *mesh, int value,
  76                                 GLboolean keepOnlyBoundary );
  77
  78 #endif