glPolygonMode	- select a polygon rasterization mode

	  void glPolygonMode( GLenum face,
			      GLenum mode )

	  face	Specifies the polygons that mode applies to.  Must be
		GL_FRONT for front-facing polygons, GL_BACK for	back-
		facing polygons, or GL_FRONT_AND_BACK for front- and
		back-facing polygons.

	  mode	Specifies how polygons will be rasterized.  Accepted
		values are GL_POINT, GL_LINE, and GL_FILL.  The
		initial	value is GL_FILL for both front- and back-
		facing polygons.

	  glPolygonMode	controls the interpretation of polygons	for
	  rasterization.  face describes which polygons	mode applies
	  to:  front-facing polygons (GL_FRONT), back-facing polygons
	  (GL_BACK), or	both (GL_FRONT_AND_BACK).  The polygon mode
	  affects only the final rasterization of polygons.  In
	  particular, a	polygon's vertices are lit and the polygon is
	  clipped and possibly culled before these modes are applied.

	  Three	modes are defined and can be specified in mode:

	  GL_POINT	Polygon	vertices that are marked as the	start
			of a boundary edge are drawn as	points.	 Point
			attributes such	as GL_POINT_SIZE and
			GL_POINT_SMOOTH	control	the rasterization of
			the points.  Polygon rasterization attributes
			other than GL_POLYGON_MODE have	no effect.

	  GL_LINE	Boundary edges of the polygon are drawn	as
			line segments.	They are treated as connected
			line segments for line stippling; the line
			stipple	counter	and pattern are	not reset
			between	segments (see glLineStipple).  Line
			attributes such	as GL_LINE_WIDTH and
			GL_LINE_SMOOTH control the rasterization of
			the lines.  Polygon rasterization attributes
			other than GL_POLYGON_MODE have	no effect.

	  GL_FILL	The interior of	the polygon is filled.
			Polygon	attributes such	as GL_POLYGON_STIPPLE
			and GL_POLYGON_SMOOTH control the
			rasterization of the polygon.
	  To draw a surface with filled	back-facing polygons and
	  outlined front-facing	polygons, call glPolygonMode(GL_FRONT,

	  Vertices are marked as boundary or nonboundary with an edge
	  flag.	 Edge flags are	generated internally by	the GL when it
	  decomposes polygons; they can	be set explicitly using

	  GL_INVALID_ENUM is generated if either face or mode is not
	  an accepted value.

	  GL_INVALID_OPERATION is generated if glPolygonMode is
	  executed between the execution of glBegin and	the
	  corresponding	execution of glEnd.

	  glGet	with argument GL_POLYGON_MODE

	  glBegin, glEdgeFlag, glLineStipple, glLineWidth,
	  glPointSize, glPolygonStipple