glClearIndex

then the the

glClearIndex
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 default value is zero.
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 called between a call to glBegin and the corresponding call to glEnd.
ASSOCIATED GETS
glGet with argument GL_INDEX_CLEAR_VALUE
glGet with argument GL_INDEX_BITS
SEE ALSO
"glClear"

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