Only one code segment left in both OP and FUUIN! its-happening.gif
Yeah, that commit is way larger than I'm comfortable with, but none of these
functions is particularly large or difficult to decompile (with the exception
of graph_putsa_fx(), which I actually did weeks ago), and OP and MAIN have
their own unique functions in between the shared ones, so…
I've looked at every openly available piece of PC-98 documentation, and there
don't seem to be any official names for the individual planes. The closest
thing I could find was the description at
http://island.geocities.jp/cklouch/column/pc98bas/pc98disphw2.htm
explaining that they represent the blue, red, green, and brightness component
when using the default PC-98 palette. However, these planes correspond to
nothing else but the 4 individual bits of the final index into the color
palette, and you can assign any color to every single palette slot. Therefore,
it's merely a convention that your own palettes don't have to follow (and in
Touhou, they don't).
Nevertheless, there doesn't seem to be an alternative, and the Neko Project II
source code uses the same B/R/G/E convention, so I'll go with that as well.
nmlgc