_c Specifies the index used when the color index buffers are cleared.
The initial value is 0.
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
ggggllllCCCClllleeeeaaaarrrrIIIInnnnddddeeeexxxx specifies the index used by ggggllllCCCClllleeeeaaaarrrr 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
m
integer part of this value is then masked with 2 -1, where m is the
number of bits in a color index stored in the frame buffer.
EEEERRRRRRRROOOORRRRSSSS
GGGGLLLL____IIIINNNNVVVVAAAALLLLIIIIDDDD____OOOOPPPPEEEERRRRAAAATTTTIIIIOOOONNNN is generated if ggggllllCCCClllleeeeaaaarrrrIIIInnnnddddeeeexxxx is executed between the
execution of ggggllllBBBBeeeeggggiiiinnnn and the corresponding execution of ggggllllEEEEnnnndddd.