glPolygonStipple - set the polygon stippling pattern

	  void glPolygonStipple( const GLubyte *mask )

	  mask	Specifies a pointer to a 32x32 stipple pattern that
		will be	unpacked from memory in	the same way that
		glDrawPixels unpacks pixels.

	  Polygon stippling, like line stippling (see glLineStipple),
	  masks	out certain fragments produced by rasterization,
	  creating a pattern.  Stippling is independent	of polygon

	  mask is a pointer to a 32x32 stipple pattern that is stored
	  in memory just like the pixel	data supplied to a
	  glDrawPixels call with height	and width both equal to	32, a
	  pixel	format of GL_COLOR_INDEX, and data type	of GL_BITMAP.
	  That is, the stipple pattern is represented as a 32x32 array
	  of 1-bit color indices packed	in unsigned bytes.
	  glPixelStore parameters like GL_UNPACK_SWAP_BYTES and
	  GL_UNPACK_LSB_FIRST affect the assembling of the bits	into a
	  stipple pattern.  Pixel transfer operations (shift, offset,
	  pixel	map) are not applied to	the stipple image, however.

	  To enable and	disable	polygon	stippling, call	glEnable and
	  glDisable with argument GL_POLYGON_STIPPLE. Polygon
	  stippling is initially disabled. If it's enabled, a
	  rasterized polygon fragment with window coordinates x	 and
	  y  is	sent to	the next stage of the GL if and	only ifwthe
	  (x  mod 32)th	bit in the (y  mod 32)th row of	the stipple
	  pattern is 1 (one).  When polygon stippling is disabled, it
	  is as	if the stipple pattern consists	of all 1's.

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

	  glIsEnabled with argument GL_POLYGON_STIPPLE

	  glDrawPixels,	glLineStipple, glPixelStore, glPixelTransfer