feat: implement WeaponManager with viewport-based viewmodel rendering and procedural animation support

weapons/base_hitscan_weapon.gd

@@ -47,7 +47,7 @@ func _process(delta: float) -> void:
 		fire_cooldown -= delta
 		
 	if reloading:
-		var spin_speed = PI * 4.0
+		var spin_speed = PI * 8.0
 		model_root.rotation.x += spin_speed * delta
 		
 		if reload_timer > 0.0:

weapons/base_projectile_weapon.gd

@@ -46,7 +46,7 @@ func _process(delta: float) -> void:
 		fire_cooldown -= delta
 		
 	if reloading:
-		var spin_speed = PI * 4.0
+		var spin_speed = PI * 8.0
 		model_root.rotation.x += spin_speed * delta
 		
 		if reload_timer > 0.0:

weapons/weapon_manager.gd

@@ -58,6 +58,9 @@ func _setup_viewmodel_viewport() -> void:
 var _bob_timer: float = 0.0
 var _recoil_pitch: float = 0.0
 var _recoil_yaw: float = 0.0
+var _target_drift_offset: Vector3 = Vector3.ZERO
+var _current_drift_offset: Vector3 = Vector3.ZERO
+var _swap_pitch: float = 0.0
 
 func add_recoil(pitch: float, yaw: float) -> void:
 	_recoil_pitch += pitch * 20.0 # Scale up for visual model recoil
@@ -86,22 +89,24 @@ func _process(_delta: float) -> void:
 				vm_camera.translate_object_local(Vector3(bob_x, bob_y, 0))
 			else:
 				_bob_timer = 0.0
+				
 			if not player.is_on_floor():
 				# Airborne Drift
 				# Convert player velocity into camera's local space
 				var local_vel = camera.global_transform.basis.inverse() * player.velocity
-					# We want the weapon to lag behind movement.
-					# If player moves left (-x), weapon should drift right (+x relative to camera, which means vm_camera shifts left -x to make weapon appear right)
-					# Wait, if vm_camera shifts left, the weapon (which is rendered by it) appears to shift RIGHT on the screen!
-					# So vm_camera shifts in the SAME direction as local velocity.
-					var drift_offset = Vector3(local_vel.x * 0.01, local_vel.y * 0.01, 0)
+				_target_drift_offset = Vector3(local_vel.x * 0.01, local_vel.y * 0.01, 0)
 				# Clamp the drift
-					drift_offset.x = clampf(drift_offset.x, -0.1, 0.1)
-					drift_offset.y = clampf(drift_offset.y, -0.1, 0.1)
-					vm_camera.translate_object_local(drift_offset)
-					# Slight rotation tilt as well
-					vm_camera.rotate_object_local(Vector3.UP, deg_to_rad(-local_vel.x * 0.5))
-					vm_camera.rotate_object_local(Vector3.RIGHT, deg_to_rad(local_vel.y * 0.5))
+				_target_drift_offset.x = clampf(_target_drift_offset.x, -0.1, 0.1)
+				_target_drift_offset.y = clampf(_target_drift_offset.y, -0.1, 0.1)
+			else:
+				_target_drift_offset = Vector3.ZERO
+				
+			# Smoothly apply drift so jumping/landing doesn't snap
+			_current_drift_offset = _current_drift_offset.lerp(_target_drift_offset, 15.0 * _delta)
+			
+			vm_camera.translate_object_local(_current_drift_offset)
+			vm_camera.rotate_object_local(Vector3.UP, deg_to_rad(-_current_drift_offset.x * 50.0))
+			vm_camera.rotate_object_local(Vector3.RIGHT, deg_to_rad(_current_drift_offset.y * 50.0))
 					
 			# Visual Recoil
 			_recoil_pitch = lerpf(_recoil_pitch, 0.0, 15.0 * _delta)
@@ -112,6 +117,12 @@ func _process(_delta: float) -> void:
 			# Add a slight backward kick along the local Z axis
 			vm_camera.translate_object_local(Vector3(0, 0, _recoil_pitch * 0.01))
 			
+			# Swap Animation
+			_swap_pitch = lerpf(_swap_pitch, 0.0, 15.0 * _delta)
+			if _swap_pitch > 0.1:
+				vm_camera.rotate_object_local(Vector3.RIGHT, deg_to_rad(_swap_pitch))
+				vm_camera.translate_object_local(Vector3(0, -_swap_pitch * 0.005, 0))
+			
 		vm_camera.fov = lerpf(vm_camera.fov, target_fov, 10.0 * _delta)
 
 func _build_loadout() -> void:
@@ -265,6 +276,9 @@ func _equip_slot(slot: int) -> void:
 		if w.has_method("unequip"):
 			w.unequip()
 		
+	if active_slot != slot:
+		_swap_pitch = 60.0
+		
 	active_slot = slot
 	
 	if weapons.has(active_slot):