GLINDEXMASK(3G) GLINDEXMASK(3G)

glIndexMask - control the writing of individual bits in the color index buffers

void glIndexMask( GLuint mask )












  

  
Specifies a bit mask to enable and disable the writing of individual bits
      in the color index buffers. Initially, the mask is all 1's.










glIndexMask controls the writing of individual bits in the
    color index buffers. The least significant n bits of mask, where n is
    the number of bits in a color index buffer, specify a mask. Where a 1 (one)
    appears in the mask, it's possible to write to the corresponding bit in the
    color index buffer (or buffers). Where a 0 (zero) appears, the corresponding
    bit is write-protected.


This mask is used only in color index mode, and it affects only
    the buffers currently selected for writing (see glDrawBuffer).
    Initially, all bits are enabled for writing.








GL_INVALID_OPERATION is generated if glIndexMask is
    executed between the execution of glBegin and the corresponding
    execution of glEnd.








glGet with argument GL_INDEX_WRITEMASK








glColorMask, glDepthMask, glDrawBuffer,
    glIndex, glIndexPointer, glStencilMask