glIndexMask(3G) OpenGL Reference glIndexMask(3G)
glIndexMask - control the writing of individual bits in the color index
void glIndexMask( GLuint mask )
mask Specifies a bit mask to enable and disable the writing of
individual bits in the color index buffers. Initially, the mask is
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,
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