GLCLEARINDEX(3G) GLCLEARINDEX(3G)

glClearIndex - specify the clear value for the color index buffers

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 2^m,
    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