glIndexMask.3gl

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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Last Edited: Mon, May 22, 1995

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