glClearIndex - specify the clear value for the color index
GLfloat c );
Specifies the index used when the color index buffers are
cleared. The initial value is 0.
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 sup m-1, where m
is the number of bits in a color index stored in the frame
GL_INVALID_OPERATION is generated if glClearIndex() is
executed between the execution of glBegin() and the corresponding
execution of glEnd().
glGet() with argument GL_INDEX_CLEAR_VALUE
glGet() with argument GL_INDEX_BITS
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