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GLPOLYGONMODE(3G) [FIXME: manual] 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_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/.
05/30/2012 [FIXME: source]