Implement fast falling (#44)

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

src/input/buffer.rs

@@ -20,6 +20,8 @@ pub enum FighterCommands {
     Jump,
     Shield,
     Attack,
+    SmashMoveUp,
+    SmashMoveDown,
     SmashMoveLeft,
     SmashMoveRight,
 }
@@ -60,6 +62,8 @@ impl FighterAttackCommandType {
 pub struct FighterCommandLifetimes {
     smash_move_left: u8,
     smash_move_right: u8,
+    smash_move_down: u8,
+    smash_move_up: u8,
     jump: u8,
     shield: u8,
     attack: u8,
@@ -72,6 +76,8 @@ impl Index<FighterCommands> for FighterCommandLifetimes {
         match command {
             FighterCommands::SmashMoveLeft => &self.smash_move_left,
             FighterCommands::SmashMoveRight => &self.smash_move_right,
+            FighterCommands::SmashMoveDown => &self.smash_move_down,
+            FighterCommands::SmashMoveUp => &self.smash_move_up,
             FighterCommands::Jump => &self.jump,
             FighterCommands::Shield => &self.shield,
             FighterCommands::Attack => &self.attack,
@@ -84,6 +90,8 @@ impl IndexMut<FighterCommands> for FighterCommandLifetimes {
         match command {
             FighterCommands::SmashMoveLeft => &mut self.smash_move_left,
             FighterCommands::SmashMoveRight => &mut self.smash_move_right,
+            FighterCommands::SmashMoveDown => &mut self.smash_move_down,
+            FighterCommands::SmashMoveUp => &mut self.smash_move_up,
             FighterCommands::Jump => &mut self.jump,
             FighterCommands::Shield => &mut self.shield,
             FighterCommands::Attack => &mut self.attack,
@@ -221,6 +229,19 @@ pub fn postprocess_input(
         let mut x_flick_detected =
             x_abs >= axis_threshold && input.frames_in_x_flick_deadzone <= frame_threshold;
 
+        if y_flick_detected {
+            input.clear_command(FighterCommands::SmashMoveUp);
+            input.clear_command(FighterCommands::SmashMoveDown);
+
+            let command_to_set = if input.current_frame.movement.y > 0.0 {
+                FighterCommands::SmashMoveUp
+            } else {
+                FighterCommands::SmashMoveDown
+            };
+
+            input.set_lifetime(command_to_set, game_settings.input_common.input_buffer_size);
+        }
+
         // if both flicks are detected, only one wins
 
         if x_flick_detected && y_flick_detected {