glPolygonStipple(3G)	       OpenGL Reference		  glPolygonStipple(3G)



NAME
     glPolygonStipple -	set the	polygon	stippling pattern


C SPECIFICATION
     void glPolygonStipple( const GLubyte *mask	)


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


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

     mask is a pointer to a 32x32 stipple pattern that is stored in memory
     just like the pixel data supplied to a glDrawPixels 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.

     Polygon stippling is enabled and disabled with glEnable and glDisable,
     using argument GL_POLYGON_STIPPLE.	 If enabled, a rasterized polygon
     fragment with window coordinates x	 and y	is sent	to the next stage of
     the GL if and only	if the (x  mod 32)th bit in the	(y  mod	32)th row of
     the stipple pattern is one. wWhen polygon stippling is disabled, it is as
     if	the stipple pattern were all ones.

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

ASSOCIATED GETS
     glGetPolygonStipple
     glIsEnabled with argument GL_POLYGON_STIPPLE


SEE ALSO
     glDrawPixels, glLineStipple, glPixelStore,	glPixelTransfer









									Page 1