fglIndexMask(3G) OpenGL Reference fglIndexMask(3G)NAME
fglIndexMask - control the writing of individual bits in the color index
buffers
FORTRAN SPECIFICATION
SUBROUTINE fglIndexMask( INTEGER*4 mask )
PARAMETERS
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.
DESCRIPTION
fglIndexMask 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 fglDrawBuffer). Initially,
all bits are enabled for writing.
ERRORS
GL_INVALID_OPERATION is generated if fglIndexMask is executed between the
execution of fglBegin and the corresponding execution of fglEnd.
ASSOCIATED GETS
fglGet with argument GL_INDEX_WRITEMASK
SEE ALSO
fglColorMask, fglDepthMask, fglDrawBuffer, fglIndex, fglIndexPointer,
fglStencilMask
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