Short, sweet, fits more nicely into 8.3 filenames than "curve bullets"
does, and 76.7% of fans agree:
https://twitter.com/ReC98Project/status/1500256959785746434
OMAKE.TXT calls them "homing lasers", but… eh, nah.
Part of P0190, funded by nrook.
This is the function that causes Marisa's `Divide Error` crash when
called during a 4-frame window during the end of certain patterns.
Just like with Kurumi's division by zero, it's just as undefined here
what should happen instead, and any possible fix can only ever be a
fan-fiction interpretation of the code. And since the community will
have an easier time understanding and debating a C++-level hack instead
of an ASM-level one, it makes sense to first decompile this function…
…and document it, which is actually much harder!
Part of P0189, funded by Arandui and Lmocinemod.
Wait, wouldn't it be cool if we could keep the render, spawn, and
update functions in the same translation unit, by switching code
segments in the middle of the file? Let's hope this works out, and give
the source file an all-encompassing generic name.
Part of P0188, funded by [Anonymous] and nrook.
With TH04's version hardcoding not only Gengetsu's dialog and
initialization, but also the Bad Ending after having clearing Stage 5
with continues or on Easy difficulty.
Part of P0188, funded by [Anonymous] and nrook.
Given how close the string literals of TH04's boss defeat sequence
function are to the end of its data segment, it makes sense to figure
out the three values after it right now.
Part of P0187, funded by [Anonymous] and Blue Bolt.
This term encompasses both the event popups, the Stage and BGM titles
(which have nothing to do with the former), and the upcoming transition
effect.
Part of P0186, funded by [Anonymous] and Blue Bolt.
The algorithm for gradually rotating these clockwise or counterclockwise
towards the player could have been 5 lines long. ZUN blows it up to 26
lines.
Also, a 16×16 killbox for the head node, and a 12×12 one for trail
nodes.
Part of P0185, funded by [Anonymous], -Tom-, and Blue Bolt.
Too bad that alignment constraints do in fact force us to compile
th04/bullet_u.cpp and th04/bullet_a.cpp separately. 😕
Part of P0184, funded by -Tom-.
Very helpful at this small scale, as it allows us to directly decompile
floating-point literals. These will be added to Sariel's regular
translation unit in the same order, so we merely have to remove them
from this temporary translation unit then.
Part of P0174, funded by Ember2528.
"I don't need the return value in MAINL.EXE? Let's copy-paste the
function and remove all of its `return` statements then!" :zunpet:
Completes P0172, funded by [Anonymous] and Blue Bolt.
Featuring inline assembly for a single ROR instruction. Turbo C++ 4.0J
unfortunately only offers intrinsics for 16-bit rotations.
Part of P0172, funded by [Anonymous] and Blue Bolt.
Aha! TH05 actually loads every single rendered dialog image
individually before rendering it, either from the EMS area or disk.
That's one way to save memory, I guess?
Part of P0169, funded by Blue Bolt.
No, I'm not copying exactly what was on ZUN's monitor during the 2010
MAG・ネット documentary. Also, this one was very lucky not to receive
a stupid function name.
Part of P0168, funded by Blue Bolt and rosenrose.
I've long moved to a convention of putting every .OBJ compiled from ZUN
code into the subdirectory of the game that introduced it. These four
are the last remaining inconsistencies from earlier in development.
Part of P0162, funded by Ember2528.
Only seen in Mima's fight, but initialized for all non-final boss
fights. Also with explicit support for all 8 origin edges, not just the
top-right one used in Mima's fight… and an off-by-one error?!
Completes P0160, funded by Yanga.
There might only be three functions between the second and new third
split, but these seem to depend on the entire rest of the code for
card-flipping stages…
Part of P0160, funded by Yanga.
Third longest function in all of PC-98 Touhou, and it's even more of a
copy-pasta than the patterns we've seen earlier. Certainly didn't feel
that long.
Part of P0156, funded by Ember2528.
Reason: That switch statement. How should we even?
Well, the code *is* fairly good. After looking very deep into it, and
spending 35% of that function on blank lines (for logical grouping) and
explanatory comments, that is…
Part of P0152, funded by -Tom- and [Anonymous].
… (24 + (difficulty * 8) + rank) in TH04, and (42 + (difficulty * 8))
in TH05. Also, TH05 only doesn't have TH04's bullet zap animation
because ZUN didn't consistently use constants…
Completes P0151, funded by Blue Bolt and -Tom-.
Slow Mode only does one thing: It looks at how many 8×8 pellets or
16×16 bullets are alive, and reduces the frame rate by 33% (i.e., turns
every second frame into two frames) if that number is…
Part of P0151, funded by Blue Bolt and -Tom-.
… Wait, we *can* decompile functions with both parameters, no stack
frame, and a Pascal calling convention?! Good that I already forgot how
impossible it was to decompile the first function I looked at that fell
into this category!
Part of P0148, funded by [Anonymous].
Including the pointless DOS I/O variation in TH05's MAIN.EXE.
I'm slowly running out of characters to remove from the first segment
name in that file, though…
Part of P0148, funded by [Anonymous].
Last one! Done with the SHARED segment for the forseeable future! 🎉
Sure, not the best C++ code either, but still by far the sanest
implementation of this function in any of the 4 games.
Completes P0139, funded by [Anonymous].
nmlgc