[wxperl-users] Creating OpenGL Tesselation (Concave Polygon) on GL Canvas

[Vaughn S. <vau...@in...>]

All,

I am seeking a way to construct a concave polygon on a glCanvas window.  =
I understand that it is mandatory to describe concave polygons as a =
"tessellation" ... and I cannot locate any information in this regard.

At a macro level I'm thinking that I should be able to implement a =
subroutine as shown below; any information would be greatly appreciated.

Vaughn

########################################
sub drawConcaveOutline
########################################
{
   ## Create the tesselator object
   my $pTess =3D gluNewTess();

   ## Set callback functions
   gluTessCallback($pTess, GLU_BEGIN,  \&glBegin);
   gluTessCallback($pTess, GLU_VERTEX, \&glVertex2fv);
   gluTessCallback($pTess, GLU_END,    \&glEnd);

   ## Smooth minimizes seeing tessellation
   glShadeModel(GL_SMOOTH);=20
  =20
   ## Begin the polygon
   gluBeginPolygon($pTess);

   ## Begin the one and only contour
   gluBeginContour($pTess);

   ## Feed in the list of vertices
   ##
   ## << Not sure the syntax here >>
   =20
   ## Close contour and polygon
   gluEndContour($pTess);
   gluEndPolygon($pTess);

   ## All done with tesselator object
   gluDeleteTess($pTess);
}