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_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: both front and back-facing polygons (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. 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_SMOOTH
           control the rasterization of the polygon.

EXAMPLES

       To draw a surface with outlined polygons, call

           glPolygonMode(GL_FRONT_AND_BACK, 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 triangle stips and fans.

ERRORS

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

ASSOCIATED GETS

       glGet() with argument GL_POLYGON_MODE

SEE ALSO

       glLineWidth(), glPointSize()

COPYRIGHT

       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free
       Software B License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS

       opengl.org