wmpack(3G) wmpack(3G)
wmpack - specifies RGBA writemask with a single packed integer
void wmpack(pack)
unsigned long pack;
pack expects a packed integer containing the RGBA (red, green, blue,
alpha) values you want to assign as the current write mask.
Expressed in hexadecimal, the format of the packed integer is
0xaabbggrr, where:
aa is the alpha value,
bb is the blue value,
gg is the green value, and
rr is the red value.
RGBA component values range from 0 to 0xFF (255).
wmpack sets the red, green, blue, and alpha write mask components of the
currently active GL framebuffer, one of normal, popup, overlay, or
underlay as specified by drawmode. The current framebuffer must be in
RGB mode for the wmpack command to be applicable. All drawing into the
color bitplanes of the current framebuffer is masked by the current write
mask. Write mask components are retained in each draw mode, so when a
draw mode is re-entered, the red, green, blue, and alpha masks are reset
to the last values specified in that draw mode.
Each write mask component is an 8-bit mask, which allows changes only to
bitplanes corresponding to ones in the mask. For example,
wmpack(0xFF0000F0) allows changes only to the 4 most significant bits of
red, and to all the bits of alpha.
It is an error to call wmpack while the current framebuffer is in color
map mode.
The write mask components of all framebuffers in RGB mode are set to 0xFF
when gconfig is called.
cpack, drawmode, gRGBmask, RGBmode
Because only the normal framebuffer currently supports RGB mode, wmpack
should be called only while draw mode is NORMALDRAW. Use getgdesc to
determine whether RGB mode is available in draw mode NORMALDRAW.
On Impact and Infinite Reality only whole components can be masked. RGB
and A can be completely masked or not masked at all.
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