GLPOLYGONMODE(3G)														 GLPOLYGONMODE(3G)

NAME

       glPolygonMode - select a polygon rasterization mode

C SPECIFICATION

       void glPolygonMode( GLenum face,
			   GLenum mode )

PARAMETERS

       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.

DESCRIPTION

       glPolygonMode controls the interpretation of polygons for rasterization.  face describes which polygons mode applies to: front-facing poly-
       gons (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  ras-
		     terization of the polygon.

EXAMPLES

       To draw a surface with filled back-facing polygons and outlined front-facing polygons, call glPolygonMode(GL_FRONT, GL_LINE);

NOTES

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

ERRORS

       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.

ASSOCIATED GETS

       glGet with argument GL_POLYGON_MODE

SEE ALSO

       glBegin(3G), glEdgeFlag(3G), glLineStipple(3G), glLineWidth(3G), glPointSize(3G), glPolygonStipple(3G)

																 GLPOLYGONMODE(3G)