dll/opengl/glu32/src/libtess/tessmono.h

   1 /*
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  30 /*
  31 ** Author: Eric Veach, July 1994.
  32 **
  33 */
  34
  35 #ifndef __tessmono_h_
  36 #define __tessmono_h_
  37
  38 /* __gl_meshTessellateMonoRegion( face ) tessellates a monotone region
  39  * (what else would it do??)  The region must consist of a single
  40  * loop of half-edges (see mesh.h) oriented CCW.  "Monotone" in this
  41  * case means that any vertical line intersects the interior of the
  42  * region in a single interval.
  43  *
  44  * Tessellation consists of adding interior edges (actually pairs of
  45  * half-edges), to split the region into non-overlapping triangles.
  46  *
  47  * __gl_meshTessellateInterior( mesh ) tessellates each region of
  48  * the mesh which is marked "inside" the polygon.  Each such region
  49  * must be monotone.
  50  *
  51  * __gl_meshDiscardExterior( mesh ) zaps (ie. sets to NULL) all faces
  52  * which are not marked "inside" the polygon.  Since further mesh operations
  53  * on NULL faces are not allowed, the main purpose is to clean up the
  54  * mesh so that exterior loops are not represented in the data structure.
  55  *
  56  * __gl_meshSetWindingNumber( mesh, value, keepOnlyBoundary ) resets the
  57  * winding numbers on all edges so that regions marked "inside" the
  58  * polygon have a winding number of "value", and regions outside
  59  * have a winding number of 0.
  60  *
  61  * If keepOnlyBoundary is TRUE, it also deletes all edges which do not
  62  * separate an interior region from an exterior one.
  63  */
  64
  65 int __gl_meshTessellateMonoRegion( GLUface *face );
  66 int __gl_meshTessellateInterior( GLUmesh *mesh );
  67 void __gl_meshDiscardExterior( GLUmesh *mesh );
  68 int __gl_meshSetWindingNumber( GLUmesh *mesh, int value,
  69                                 GLboolean keepOnlyBoundary );
  70
  71 #endif