Implement fast falling (#44)

Reviewed-on: #44
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/fighter/state/fall.rs

@@ -1,12 +1,24 @@
 use super::{CollisionContext, EnterContext, FighterStateImpl, InterruptContext, UpdateContext};
 use crate::fighter::animation::AnimKind;
+use crate::fighter::state::air::AirborneStateCommon;
 use crate::fighter::state::{FighterState, air, jump};
 
-#[derive(Debug, Clone, Copy, Hash)]
-pub struct FallState;
+#[derive(Debug, Clone, Copy, Hash, Default)]
+pub struct FallState {
+    airborne_state_common: AirborneStateCommon
+}
+
+impl FallState {
+    pub fn new(airborne_state_common: AirborneStateCommon) -> Self {
+        Self {
+            airborne_state_common
+        }
+    }
+}
 
 impl FighterStateImpl for FallState {
     const NAME: &'static str = "Fall";
+    
     fn check_interrupt(&self, state_context: &mut InterruptContext) -> Option<FighterState> {
         jump::check_input_double_jump(state_context)
     }
@@ -16,7 +28,7 @@ impl FighterStateImpl for FallState {
     }
 
     fn update(&mut self, state_context: &mut UpdateContext) {
-        air::update_standard_motion(state_context);
+        air::update_standard_motion(state_context, &mut self.airborne_state_common);
     }
 
     fn check_collision_interrupt(
@@ -36,11 +48,3 @@ impl FighterStateImpl for FallState {
     }
 }
 
-pub fn check_input(state_context: &InterruptContext) -> Option<FighterState> {
-    let input_frame = state_context.input.get_last_frame();
-
-    if input_frame.movement.x.abs() < state_context.game_settings.input_common.stick_deadzone {
-        return Some(FighterState::Fall(FallState));
-    }
-    None
-}