glIndexMask man page on OSF1

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glIndexMask(3G)						       glIndexMask(3G)

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

SYNOPSIS
       void glIndexMask(
	       GLuint mask );

PARAMETERS
       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
       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 cor‐
       responding 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()).  Ini‐
       tially, 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(3),	glDepthMask(3),	 glDrawBuffer(3), glIndex(3), glIndex‐
       Pointer(3), glStencilMask(3)

							       glIndexMask(3G)
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