glClearIndex.3G - Man Page

specify the clear value for the color index buffers

C Specification

void glClearIndex( GLfloat 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 2m - 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.

Associated Gets

glGet with argument GL_INDEX_CLEAR_VALUE
glGet with argument GL_INDEX_BITS

See Also