GLPOLYGONMODE

Section: [FIXME: manual] (3G)
Updated: 01/28/2020
Page Index
 

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  

VERSION SUPPORT

OpenGL Version
Function / Feature Name 2.0 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5
glPolygonMode

 

SEE ALSO

glLineWidth(), glPointSize()  

COPYRIGHT

Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see m[blue]http://oss.sgi.com/projects/FreeB/m[].  

COPYRIGHT


Copyright © 1991-2006 Silicon Graphics, Inc.
Copyright © 2010-2014 Khronos Group


 

Index

NAME
C SPECIFICATION
PARAMETERS
DESCRIPTION
EXAMPLES
NOTES
ERRORS
ASSOCIATED GETS
VERSION SUPPORT
SEE ALSO
COPYRIGHT
COPYRIGHT
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