glCullFace - specify whether front- or back-facing facets
can be culled

glCullFace
	glCullFace(mode) -> None

void glCullFace( GLenum mode )

mode	Specifies whether front- or back-facing	facets are
      candidates for culling.	 Symbolic constants GL_FRONT,
      GL_BACK, and GL_FRONT_AND_BACK are accepted.  The
      initial	value is GL_BACK.

glCullFace specifies whether front- or back-facing facets
are culled (as specified by mode) when facet culling is
enabled. Facet culling is initially disabled.	 To enable and
disable facet	culling, call the glEnable and glDisable
commands with	the argument GL_CULL_FACE.  Facets include
triangles, quadrilaterals, polygons, and rectangles.

glFrontFace specifies	which of the clockwise and
counterclockwise facets are front-facing and back-facing.
See glFrontFace.

If  mode is GL_FRONT_AND_BACK, no facets are drawn, but
other	primitives such	as points and lines are	drawn.

GL_INVALID_ENUM is generated if mode is not an accepted
value.

GL_INVALID_OPERATION is generated if glCullFace is executed
between the execution	of glBegin and the corresponding
execution of glEnd.

glIsEnabled with argument GL_CULL_FACE
glGet	with argument GL_CULL_FACE_MODE

glEnable, glFrontFace