implementing jump input buffering on grounded

player_controller/PlayerController.tscn

@@ -69,6 +69,7 @@ Weight = 4.0
 MantleTime = 0.3
 MantlePath = ExtResource("2_6lejt")
 CoyoteTime = 0.3
+InputBufferFrames = 5
 SimpleJumpStartVelocity = 6.0
 SimpleJumpHangTimeInFrames = 1
 SimpleJumpGravityLesseningFactor = 2.0

player_controller/Scripts/PlayerController.cs

@@ -89,6 +89,8 @@ public partial class PlayerController : CharacterBody3D
 	[ExportGroup("Jump")] 
 	[Export(PropertyHint.Range, "0,1,0.01")]
 	public float CoyoteTime { get; set; } = 0.2f;
+	[Export(PropertyHint.Range, "0,10,1,or_greater")]
+	public int InputBufferFrames { get; set; } = 3;
 	
 	// Simple jump
 	[ExportSubgroup("Simple jump")]
@@ -229,6 +231,8 @@ public partial class PlayerController : CharacterBody3D
 	private Transition       _onLeaveWallFromRunCoyote;
 	private Transition       _onLeaveWallFromRun;
 
+	private int _currentJumpBufferFrames = 0;
+
 	private float            _playerHeight;
 	private float            _playerRadius;
 	private bool _isJumpInputPressed;
@@ -466,6 +470,12 @@ public partial class PlayerController : CharacterBody3D
 		
 		if (_simpleDashCooldownTimer.IsStopped())
 			_simpleDashCooldownTimer.Start();
+
+		if (_currentJumpBufferFrames > 0)
+		{
+			_currentJumpBufferFrames = 0;
+			PerformJump();
+		}
 	}
 
 	public void DashCooldownTimeout()
@@ -639,7 +649,13 @@ public partial class PlayerController : CharacterBody3D
 	// Jump
 	public void OnInputJumpStarted()
 	{
+		_currentJumpBufferFrames = InputBufferFrames;
 		_isJumpInputPressed = true;
+		PerformJump();
+	}
+
+	public void PerformJump()
+	{
 		if (MantleSystem.IsMantlePossible)
 		{
 			_playerState.SendEvent("mantle");
@@ -870,8 +886,8 @@ public partial class PlayerController : CharacterBody3D
 			SetVerticalVelocity(Velocity.Y - 2.0f);
 		}
 		
-		// Move back to Airborne state management when starting to go down again
-		if (_framesSinceJumpAtApex > hangFrames)
+		// Move back to Airborne state when starting to go down again or if input isn't held anymore (buffered jump) 
+		if (_framesSinceJumpAtApex > hangFrames || !_isJumpInputPressed)
 			_playerState.SendEvent("jump_ended");
 	}
 	public void HandleSimpleJump(float delta)
@@ -1395,6 +1411,8 @@ public partial class PlayerController : CharacterBody3D
 	///////////////////////////
 	public override void _PhysicsProcess(double delta)
 	{
+		if (_currentJumpBufferFrames > 0) _currentJumpBufferFrames -= 1;
+		
 		LookAround(delta);
 		CameraModifications((float) delta);
 		HandleStairs((float) delta);