Commit Graph

8 Commits

Author SHA1 Message Date
nmlgc 4d24ca53bd [Decompilation] [th04/th05] Bullets: Update function
… (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-.
2021-07-31 20:19:33 +02:00
nmlgc 18e755d99b [Decompilation] [th04] Bullets: Regular spawn function
Part of P0150, funded by Blue Bolt.
2021-07-31 20:19:32 +02:00
nmlgc d876eeb7bd [Decompilation] [th04] Bullets: Clipping and pre-spawn hit test
First place to confirm the hitbox of both the 8×8 pellets and the 16×16
sprite bullets!

Well, "hitbox". It's really more of a kill delta of 8×8 pixels between
the center points of a bullet and the player. You can distribute these
pixels to any combination of bullet and player "hitboxes" that make up
8×8. 4×4 around both the player and bullets? 1×1 for bullets, and 8×8
for the player? All equally valid… or perhaps none of them, once you
keep in mind that other entity types might have different kill deltas,
which turns the concept of a "hitbox" into just a confusing abstraction.

Part of P0150, funded by Blue Bolt.
2021-07-31 20:19:26 +02:00
nmlgc 2c52bb5ef3 [Decompilation] [th04] Bullets: Velocity and angle calculation
`switch` statements compiling to binary searches if the range of values
is nasty enough? That's so cool. Apart from a few places in TH02,
this is the only place in PC-98 Touhou to show off that Turbo C++
optimization.

That code's still unexpectedly janky for what you'd expect from the 4th
game in the series, though.

Part of P0150, funded by Blue Bolt.
2021-07-31 16:15:32 +02:00
nmlgc 0eb7e38543 [Naming] [th04/th05] Bullets: Low-level spawn functions
Part of P0149, funded by Blue Bolt, Ember2528, and -Tom-.
2021-07-31 09:33:51 +02:00
nmlgc db05bffca3 [Maintenance] Turn motion_t into a template
motion_t is also used for certain animations in MAINE.EXE, so not all
instances refer to entities in playfield space. Explicitly specifying
the latter now allows us to gain…

Part of P0149, funded by Blue Bolt, Ember2528, and -Tom-.
2021-07-31 09:33:50 +02:00
nmlgc 1244bd74e7 [Maintenance] Prefer the -zC and -zP options over `#pragma codeseg`
Might look uglier, but has the advantage of not generating an empty
segment with the default name… *and* the default padding, which will
really come in handy with the following breakthrough.

Part of P0137, funded by [Anonymous].
2021-04-03 20:12:09 +02:00
nmlgc 829946a29e [Decompilation] [th04] Difficulty- and rank-based bullet pattern tuning
Because it's at least *possible* to decompile TH04's version of these
functions.

Part of P0109, funded by [Anonymous] and Blue Bolt.
2020-08-16 21:40:32 +02:00