NAME
	  glClearIndex - specify the clear value for the color index
	  buffers


     C SPECIFICATION
	  void glClearIndex( GLfloat c )


     PARAMETERS
	  c  Specifies the index used when the color index buffers are
	     cleared.  The initial value is 0.

     DESCRIPTION
	  glClearIndex specifies the index used	by glClear to clear
	  the color index buffers.  c is not clamped.  Rather, c is
	  converted to a fixed-point value with	unspecified precision
	  to the right of the binary point.  The integer part of this
	  value	is then	masked with 2m-1, where	m is the number	of
	  bits in a color index	stored in the frame buffer.

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

     ASSOCIATED	GETS
	  glGet	with argument GL_INDEX_CLEAR_VALUE
	  glGet	with argument GL_INDEX_BITS

     SEE ALSO
	  glClear