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



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


C SPECIFICATION
     void glIndexMask( GLuint mask )


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


DESCRIPTION
     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.  Wherever a one appears in
     the mask, the corresponding bit in	the color index	buffer (or buffers) is
     made writable.  Where a zero appears, the 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
     GL_INVALID_OPERATION is generated if glIndexMask is executed between the
     execution of glBegin and the corresponding	execution of glEnd.

ASSOCIATED GETS
     glGet with	argument GL_INDEX_WRITEMASK


SEE ALSO
     glColorMask, glDepthMask, glDrawBuffer, glIndex, glStencilMask



















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