glIndexMask - control the writing of individual bits in
the color index buffers
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
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(3), glDepthMask(3), glDrawBuffer(3), glIndex(3), glIndexPointer(3), glStencilMask(3)
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