Rework input buffer to match HDR closer (#79)

## Summary

- Preserve distinct same-action bindings in rollback input frames.
- Add independent command lifetimes with tap and state-scoped hold buffering.
- Detect second shield bindings and consume shield commands for air dodge.
- Fix duplicate keyboard mappings being overwritten.

Reviewed-on: #79
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/input/mod.rs

@@ -15,7 +15,7 @@ pub mod keyboard;
 pub mod map;
 
 pub use buffer::{FighterCommands, FighterInput};
-pub use frame::FighterInputFrame;
+pub use frame::{ActionBindingMask, DigitalAction, DigitalActionBindings, FighterInputFrame};
 pub use map::{
     BaseInputMap, GamepadBinding, GamepadInputMapElement, InputActionState, InputMapAction,
     KeyboardInputMapElement, MenuGamepadInputMapElement, MenuInputMap, MenuInputMapAction,
@@ -78,36 +78,43 @@ impl Plugin for FighterInputPlugin {
                 KeyboardInputMapElement {
                     key: KeyCode::KeyD,
                     action: InputMapAction::MovementXDir(1),
+                    binding_slot: 0,
                 },
                 // left
                 KeyboardInputMapElement {
                     key: KeyCode::KeyA,
                     action: InputMapAction::MovementXDir(-1),
+                    binding_slot: 0,
                 },
                 // up
                 KeyboardInputMapElement {
                     key: KeyCode::KeyW,
                     action: InputMapAction::MovementYDir(1),
+                    binding_slot: 0,
                 },
                 // down
                 KeyboardInputMapElement {
                     key: KeyCode::KeyS,
                     action: InputMapAction::MovementYDir(-1),
+                    binding_slot: 0,
                 },
                 // jump
                 KeyboardInputMapElement {
                     key: KeyCode::Space,
                     action: InputMapAction::Jump,
+                    binding_slot: 0,
                 },
                 // shield/airdodge
                 KeyboardInputMapElement {
                     key: KeyCode::ShiftLeft,
                     action: InputMapAction::Shield,
+                    binding_slot: 0,
                 },
                 // attack
                 KeyboardInputMapElement {
                     key: KeyCode::KeyJ,
                     action: InputMapAction::Attack,
+                    binding_slot: 0,
                 },
                 // Menu
             ],
@@ -116,28 +123,34 @@ impl Plugin for FighterInputPlugin {
                 GamepadInputMapElement {
                     binding: GamepadBinding::Axis(GamepadAxis::LeftStickX, 1),
                     action: InputMapAction::MovementXDir(1),
+                    binding_slot: 0,
                 },
                 GamepadInputMapElement {
                     binding: GamepadBinding::Axis(GamepadAxis::LeftStickY, 1),
                     action: InputMapAction::MovementYDir(1),
+                    binding_slot: 0,
                 },
                 // jump
                 GamepadInputMapElement {
                     binding: GamepadBinding::Button(GamepadButton::North),
                     action: InputMapAction::Jump,
+                    binding_slot: 0,
                 },
                 GamepadInputMapElement {
                     binding: GamepadBinding::Button(GamepadButton::LeftTrigger2),
                     action: InputMapAction::Shield,
+                    binding_slot: 0,
                 },
                 GamepadInputMapElement {
                     binding: GamepadBinding::Button(GamepadButton::RightTrigger2),
                     action: InputMapAction::Shield,
+                    binding_slot: 1,
                 },
                 // attack
                 GamepadInputMapElement {
                     binding: GamepadBinding::Button(GamepadButton::East),
                     action: InputMapAction::Attack,
+                    binding_slot: 0,
                 },
             ],
         })