Commit Graph

9 Commits

Author SHA1 Message Date
nmlgc 042b7802bf [Reverse-engineering] [th04/th05] Resident structure
And yes, you can get it in your own tool by simply #including
th04/th04.hpp or th05/th05.hpp.

Completes P0065, funded by Touhou Patch Center.
2020-01-03 21:43:43 +01:00
nmlgc 765eae82e8 [Maintenance] [th05] Minimize #includes for the shot type translation units
Since a few annoying alignment bytes suggested more translation units
than previously expected, using many small headers has proved to be
better than one big shared TH04/TH05 header file. Or should we *really*
pepper the code with lots of `#pragma codestring`? 😛

And in case we have multiple translation units which all #include the
same set of headers, we'll just go with situational shared headers,
using a common prefix.

Part of P0062, funded by Touhou Patch Center.
2019-12-22 15:32:44 +01:00
nmlgc e7e1cbcaaf [Decompilation] [th05] Marisa's shot control functions
Yeah… such fun pretending that the original code wasn't copy-pasted.
And yes, Reimu will have to wait until the next one.

Completes P0037, funded by zorg.
2019-10-14 23:54:37 +02:00
nmlgc db4de240e9 [Decompilation] Prepare the C side for the shot type control functions
That should make this convoluted copypasta a bit easier to read. And
sure, I could have done something about the loop as well, but
SHOT_FUNC_INIT already hides enough control flow behind a macro…

Part of P0037, funded by zorg.
2019-10-14 23:42:20 +02:00
nmlgc 82b0e1db24 [Reverse-engineering] [th05] Player shot cycle bitflags
A TH05 innovation that actually makes the game code easier to read?!
Although it was quite hard to actually reverse-engineer it, with the
confusing flag ordering pointing to some deeper meaning behind the
flags, which really doesn't exist.

Completes P0036, funded by zorg.
2019-10-14 23:42:09 +02:00
nmlgc 3383a4558b [Decompilation] [th05] Resetting boss-related variables
Part of P0031, funded by zorg.
2019-09-21 13:01:30 +02:00
nmlgc b0c2122eec [Decompilation] [th05] Stage-related .BB file loading boilerplate
Yay for alignment, allowing us once again to only move unrelated
variable declarations over to C…

Part of P0031, funded by zorg.
2019-09-21 12:59:22 +02:00
nmlgc dea40ad770 [Decompilation] [th05] Stage setup
"Yeah, let's do this real quick, how can this possibly be hard, it's
just MOVs and a few function calls"…

…except that these MOVs access quite a lot of data, which we now all
have to declare in the C world, hooray.
Once it came to midbosses and bosses, I just turned them into C structs
after all. Despite what I said in 260edd8… after all, the ASM world
doesn't care about the representation in the C world, so they don't
necessarily have to be the same.

Since these structs can't contain everything related to midbosses and
bosses (really, why did all those variables have to be spread out like
this, ZUN?), it also made for a nice occasion to continue the "stuff"
naming scheme, describing "an obviously incomplete collection of
variables related to a thing", first seen in 160d4eb.

Also, PROCDESC apparently is the only syntactically correct option to
declare an extern near proc?

Also, that `boss_phase_timed_out` variable only needs to be here
already because TCC enforces word alignment for the .data segment…
yeah, it's technically not related to this commit, but why waste time
working around it if we can just include that one variable.

Completes P0030, funded by zorg.
2019-09-15 20:35:15 +02:00
nmlgc 9d121c7cce [Decompilation] [th04/th05] Handle subpixels at the C++ type level
I've had the idea to hide this implementation detail and improve code
readability for some time now, but it obviously must still all inline,
to be indistinguishable from a direct assignment of the correct value…

… which, amazingly, it does! Even the static_cast from float to int.
The latter allows us to exclusively implement this for float, since we
do have to express the occasional value smaller than 16.

Who needs macros anyway. Yay, C++ in TH04 and TH05 after all!

Part of P0030, funded by zorg.
2019-09-15 20:30:35 +02:00