Manual Reference Pages - GLINDEXMASK (3)
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 1s.
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,
its 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
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
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