gl.FrontFace(mode)
#GL_CULL_FACE.
The projection of a polygon to window coordinates is said to have clockwise winding if an imaginary object following the
path from its first vertex, its second vertex, and so on, to its last vertex, and finally back to its first vertex, moves
in a clockwise direction about the interior of the polygon. The polygon's winding is said to be counterclockwise if the
imaginary object following the same path moves in a counterclockwise direction about the interior of the polygon.
gl.FrontFace() specifies whether polygons with clockwise winding in window coordinates, or counterclockwise winding in
window coordinates, are taken to be front-facing. Passing #GL_CCW to mode selects counterclockwise polygons as front-facing;
#GL_CW selects clockwise polygons as front-facing. By default, counterclockwise polygons are taken to be front-facing.
Please consult an OpenGL reference manual for more information.
#GL_CW and #GL_CCW are accepted; the initial value is #GL_CCW#GL_INVALID_ENUM is generated if mode is not an accepted value.
#GL_INVALID_OPERATION is generated if gl.FrontFace() is executed between the execution of gl.Begin() and the corresponding execution of gl.End() .
#GL_FRONT_FACE