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glClearIndex - specify the clear value for the color index buffers
void glClearIndex( GLfloat c )
eqn not supported
- c
- 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 $2 sup m^-^1$, where $m$ 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(3G)
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