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glPolygonMode function

Applies to: desktop apps only

The glPolygonMode function selects a polygon rasterization mode.

Syntax

void WINAPI glPolygonMode(
  GLenum face,
  GLenum mode
);

Parameters

face

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

The way polygons will be rasterized. The following modes are defined and can be specified in mode. The default is GL_FILL for both front- and back-facing polygons.

ValueMeaning
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.

 

Return value

This function does not return a value.

Error codes

The following error codes can be retrieved by the glGetError function.

NameMeaning
GL_INVALID_ENUM

Either face or mode was not an accepted value.

GL_INVALID_OPERATION

The function was called between a call to glBegin and the corresponding call to glEnd.

Remarks

The glPolygonMode function controls the interpretation of polygons for rasterization. The face parameter 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.

To draw a surface with filled back-facing polygons and outlined front-facing polygons, call

glPolygonMode(GL_FRONT, GL_LINE);

Vertices are marked as boundary or nonboundary with an edge flag. Edge flags are generated internally by OpenGL when it decomposes polygons, and they can be set explicitly using glEdgeFlag.

The following function retrieves information related to glPolygonMode:

glGet with argument GL_POLYGON_MODE

Requirements

Minimum supported client

Windows 2000 Professional

Minimum supported server

Windows 2000 Server

Header

Gl.h

Library

Opengl32.lib

DLL

Opengl32.dll

See also

glBegin
glEdgeFlag
glEnd
glLineStipple
glLineWidth
glPointSize
glPolygonStipple

 

 

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Build date: 3/6/2012

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