| Extracted from Pike v7.8 release 866 at 2018-02-09.

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GL

# Method GL.glPolygonMode()

Method glPolygonMode

  `void glPolygonMode(int face, int mode)`

Description

  glPolygonMode controls the interpretation of polygons for rasterization. face 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.

  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 rasterization of the polygon.

Parameter `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.

Parameter `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.

Throws

  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 .