glIndexMask

GLINDEXMASK(3G)						      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	indi-
	     vidual  bits in the color index buffers.  Initially, the mask is
	     all 1’s.

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.   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
       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(3G),	  glDepthMask(3G),   glDrawBuffer(3G),	 glIndex(3G),
       glIndexPointer(3G), glStencilMask(3G)



							      GLINDEXMASK(3G)