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. 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 , where is the number of bits in a color index stored in the frame buffer.
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