osx man page for glclearindex

GLCLEARINDEX(3G)														  GLCLEARINDEX(3G)

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 2^m,  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

																  GLCLEARINDEX(3G)