glClearIndex

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 $2^{\mathit{m}}-1$ , where $\mathit{m}$ is the number of bits in a color index stored in the frame buffer.

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

glClear

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