glClearIndex — specify the clear value for the color index buffers
void glClearIndex( | GLfloat | c) ; |
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 , where 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.
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