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Document SYS4 logical input bindings

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gamer147
2026-07-21 10:07:21 -04:00
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@@ -2152,3 +2152,21 @@ by this investigation.
storage backend, seed, or script-specific behavior.
Validation: opcode source regenerated; opcode tests/lint and `git diff --check` are clean.
### Slice B1 SYSTEM4 logical input bindings investigated (2026-07-21)
Native RE resolves SYSTEM4's adjacent `0xfe`/`0x107`/`0x10b`/`0x10c` block as the configuration layer for
the logical action mask consumed by `0xff`/`0x100`. `0xfe` sets a ten-action dispatch bound. Native default
arrows use 0=up, 1=right, 2=down, 3=left; keyboard mappings then assign Z/Enter, Space, C/LeftCtrl, X,
PageUp, and PageDown to actions 4 through 9. Joystick axes use the same directional actions, six physical
buttons map to actions 4 through 9, left mouse defaults to action 4, and SYSTEM4 remaps right mouse to 7.
The port presently sends six Godot UI actions directly to logical indices in a different directional
order and lets `0x100` scan all 32 slots. The next implementation should therefore be one generic,
engine-owned physical-to-logical binding service: model native defaults, implement all four setters, bound
callback polling/dispatch by the configured count, and route Godot key/mouse/joy events through the model.
It requires no save/profile decision, seed, or Himegari-specific branch. No runtime implementation is
claimed by this investigation.
**Next:** implement that input-binding service as one coherent slice with focused mapping, bounds, and
simultaneous-input regressions, then manually exercise TITLE/ROOM/ADV keyboard and mouse paths.