NAME
glIndexMask
- control the writing of individual bits in the color index buffers
C SPECIFICATION
void ggllIInnddeexxMMaasskk(
GLuint _m_a_s_k )
delim $$
PARAMETERS
-
_m_a_s_k
-
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
ggllIInnddeexxMMaasskk controls the writing of individual bits in the color index buffers.
The least significant $n$ bits of _m_a_s_k,
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 ggllDDrraawwBBuuffffeerr).
Initially, all bits are enabled for writing.
ERRORS
GGLL__IINNVVAALLIIDD__OOPPEERRAATTIIOONN is generated if ggllIInnddeexxMMaasskk
is executed between the execution of ggllBBeeggiinn
and the corresponding execution of ggllEEnndd.
ASSOCIATED GETS
ggllGGeett with argument GGLL__IINNDDEEXX__WWRRIITTEEMMAASSKK
SEE ALSO
ggllCCoolloorrMMaasskk((33GG)),
ggllDDeepptthhMMaasskk((33GG)),
ggllDDrraawwBBuuffffeerr((33GG)),
ggllIInnddeexx((33GG)),
ggllIInnddeexxPPooiinntteerr((33GG)),
ggllSStteenncciillMMaasskk((33GG))