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Table of Contents
glIndexMask - control the writing of individual bits in the color index buffers
void glIndexMask( GLuint mask )
eqn not supported
- 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(3G)
, glDepthMask(3G)
, glDrawBuffer(3G)
,
glIndex(3G)
, glIndexPointer(3G)
, glStencilMask(3G)
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