getzbuffer - returns whether z-buffering is on or off
FUNCTION RETURN VALUE
The returned value of this function is either TRUE or FALSE.
TRUE indicates that z-buffering is on.
FALSE indicates that z-buffering is off. (FALSE is the default.) For
systems without the zbuffer option, this function always returns FALSE.
getzbuffer returns the current value of the z-buffer flag.
lsetdepth zbuffer, zclear,
This routine is available only in immediate mode.
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