glIndexMask(3G)		       OpenGL Reference		       glIndexMask(3G)

NAME    [Toc]    [Back]

     glIndexMask - control the writing of individual bits in the color index
     buffers

C SPECIFICATION    [Toc]    [Back]

     void glIndexMask( GLuint mask )

PARAMETERS    [Toc]    [Back]

     mask  Specifies a bit mask	to enable and disable the writing of
	   individual bits in the color	index buffers.	Initially, the mask is
	   all 1's.

DESCRIPTION    [Toc]    [Back]

     glIndexMask controls the writing of individual bits in the	color index
     buffers.  The least significant n bits of mask, where n is	the number of
     bits in a color index buffer, specify a mask.  Where a 1 (one) appears in
     the mask, it's possible to	write to the corresponding bit in the color
     index buffer (or buffers).	Where a	0 (zero) appears, the corresponding
     bit is write-protected.

     This mask is used only in color index mode, and it	affects	only the
     buffers currently selected	for writing (see glDrawBuffer).	 Initially,
     all bits are enabled for writing.

ERRORS    [Toc]    [Back]

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

ASSOCIATED GETS    [Toc]    [Back]

     glGet with	argument GL_INDEX_WRITEMASK

SEE ALSO    [Toc]    [Back]

     glColorMask, glDepthMask, glDrawBuffer, glIndex, glIndexPointer,
     glStencilMask


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