glClearIndex — specify the clear value for the color index buffers
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.
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
is the number of bits in a color index stored in the frame buffer.
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