Adding generated sounds to car

game/scenes/Vehicles/car.gd

@@ -12,14 +12,28 @@ extends RigidBody3D
 @export var exit_path: NodePath
 @export var camera_path: NodePath
 @export var interact_area_path: NodePath
+@export var engine_audio_fade_speed: float = 8.0
+@export var hit_sound_cooldown: float = 0.25
 
 @onready var seat: Node3D = get_node(seat_path) if seat_path != NodePath("") else null
 @onready var exit_point: Node3D = get_node(exit_path) if exit_path != NodePath("") else null
 @onready var car_camera: Camera3D = get_node(camera_path) if camera_path != NodePath("") else null
 @onready var interact_area: Area3D = get_node(interact_area_path) if interact_area_path != NodePath("") else null
+@onready var engine_idle_audio: AudioStreamPlayer3D = get_node_or_null("Audio/EngineIdle")
+@onready var engine_drive_audio: AudioStreamPlayer3D = get_node_or_null("Audio/EngineDrive")
+@onready var engine_accel_audio: AudioStreamPlayer3D = get_node_or_null("Audio/EngineAccel")
+@onready var enter_audio: AudioStreamPlayer3D = get_node_or_null("Audio/Enter")
+@onready var exit_audio: AudioStreamPlayer3D = get_node_or_null("Audio/Exit")
+@onready var brake_audio: AudioStreamPlayer3D = get_node_or_null("Audio/Brake")
+@onready var hit_audio: AudioStreamPlayer3D = get_node_or_null("Audio/Hit")
 
 var _nearby_driver: Node = null
 var _driver: Node = null
+var _speed_factor: float = 0.0
+var _throttle_input: float = 0.0
+var _braking: bool = false
+var _was_braking: bool = false
+var _hit_sound_time_left: float = 0.0
 
 func _ready() -> void:
 	add_to_group("vehicle")
@@ -33,17 +47,23 @@ func _ready() -> void:
 	contact_monitor = true
 	max_contacts_reported = 8
 
-func _process(_delta: float) -> void:
+func _process(delta: float) -> void:
 	if _driver == null and _nearby_driver != null and Input.is_action_just_pressed("interact"):
 		_enter_vehicle(_nearby_driver)
 	elif _driver != null and Input.is_action_just_pressed("interact"):
 		_exit_vehicle()
+	_update_audio(delta)
+	_hit_sound_time_left = maxf(0.0, _hit_sound_time_left - delta)
 
 func _integrate_forces(state: PhysicsDirectBodyState3D) -> void:
 	if _driver == null:
+		_speed_factor = 0.0
+		_throttle_input = 0.0
+		_braking = false
 		return
 
 	var input2v := Input.get_vector("ui_left", "ui_right", "ui_up", "ui_down")
+	_throttle_input = input2v.y
 	var forward := global_transform.basis.z
 	forward.y = 0.0
 	forward = forward.normalized()
@@ -51,6 +71,9 @@ func _integrate_forces(state: PhysicsDirectBodyState3D) -> void:
 	var current_speed := linear_velocity.dot(forward)
 	var target_speed := input2v.y * drive_speed
 	var accel := drive_accel if abs(input2v.y) > 0.01 else brake_strength
+	var is_coasting_brake: bool = abs(input2v.y) <= 0.01 and abs(current_speed) > drive_speed * 0.35
+	var is_reverse_brake: bool = abs(input2v.y) > 0.01 and signf(input2v.y) != signf(current_speed) and abs(current_speed) > drive_speed * 0.25
+	_braking = is_coasting_brake or is_reverse_brake
 	var new_forward_speed := move_toward(current_speed, target_speed, accel * state.step)
 	var forward_vel := forward * new_forward_speed
 	var lateral_vel := linear_velocity - (forward * current_speed)
@@ -58,6 +81,7 @@ func _integrate_forces(state: PhysicsDirectBodyState3D) -> void:
 	linear_velocity = forward_vel + lateral_vel
 
 	var speed_factor: float = clamp(abs(new_forward_speed) / drive_speed, 0.0, 1.0)
+	_speed_factor = speed_factor
 	var turn_input := input2v.x
 	if new_forward_speed < -0.1:
 		turn_input = -turn_input
@@ -80,12 +104,15 @@ func _integrate_forces(state: PhysicsDirectBodyState3D) -> void:
 					launch_dir = normal_world if normal_world.length() > 0.001 else forward.normalized()
 				var impulse := launch_dir * (launch_impulse * speed_factor) + Vector3.UP * launch_up_impulse
 				(collider as RigidBody3D).apply_central_impulse(impulse)
+				_play_hit_audio(speed_factor)
 
 func _enter_vehicle(player: Node) -> void:
 	if seat == null:
 		return
 	_driver = player
 	player.call("enter_vehicle", self, seat, car_camera)
+	_play_one_shot(enter_audio)
+	_start_engine_audio()
 	if car_camera:
 		car_camera.current = true
 
@@ -94,6 +121,10 @@ func _exit_vehicle() -> void:
 		return
 	_driver.call("exit_vehicle", exit_point, car_camera)
 	_driver = null
+	_speed_factor = 0.0
+	_throttle_input = 0.0
+	_braking = false
+	_play_one_shot(exit_audio)
 	if car_camera:
 		car_camera.current = false
 
@@ -104,3 +135,55 @@ func _on_interact_body_entered(body: Node) -> void:
 func _on_interact_body_exited(body: Node) -> void:
 	if body == _nearby_driver:
 		_nearby_driver = null
+
+func _start_engine_audio() -> void:
+	_start_engine_player(engine_idle_audio)
+	_start_engine_player(engine_drive_audio)
+	_start_engine_player(engine_accel_audio)
+
+func _update_audio(delta: float) -> void:
+	if _driver != null:
+		_start_engine_audio()
+
+	var active: bool = _driver != null
+	var throttle_weight: float = clamp(abs(_throttle_input), 0.0, 1.0)
+	var accel_weight: float = throttle_weight * clamp(_speed_factor * 1.25, 0.0, 1.0)
+	var drive_weight: float = clamp(_speed_factor * 1.25, 0.0, 1.0) * (1.0 - accel_weight * 0.45)
+	var idle_weight: float = 0.9 - clamp(_speed_factor * 1.35, 0.0, 0.72)
+
+	_set_engine_player(engine_idle_audio, idle_weight if active else 0.0, 0.86 + _speed_factor * 0.18, delta)
+	_set_engine_player(engine_drive_audio, drive_weight if active else 0.0, 0.92 + _speed_factor * 0.35, delta)
+	_set_engine_player(engine_accel_audio, accel_weight if active else 0.0, 0.96 + _speed_factor * 0.5, delta)
+
+	if _braking and not _was_braking:
+		_play_one_shot(brake_audio)
+	_was_braking = _braking
+
+func _set_engine_player(player: AudioStreamPlayer3D, weight: float, pitch: float, delta: float) -> void:
+	if player == null:
+		return
+	var target_volume: float = linear_to_db(maxf(weight, 0.0001)) - 2.0
+	if weight <= 0.001:
+		target_volume = -80.0
+	player.volume_db = move_toward(player.volume_db, target_volume, engine_audio_fade_speed * 10.0 * delta)
+	player.pitch_scale = move_toward(player.pitch_scale, pitch, engine_audio_fade_speed * delta)
+
+func _start_engine_player(player: AudioStreamPlayer3D) -> void:
+	if player == null or player.playing:
+		return
+	player.play()
+
+func _play_one_shot(player: AudioStreamPlayer3D) -> void:
+	if player == null:
+		return
+	player.stop()
+	player.play()
+
+func _play_hit_audio(speed_factor: float) -> void:
+	if hit_audio == null or _hit_sound_time_left > 0.0:
+		return
+	hit_audio.pitch_scale = randf_range(0.92, 1.08)
+	var hit_volume: float = clamp(speed_factor, 0.25, 1.0)
+	hit_audio.volume_db = linear_to_db(hit_volume) - 3.0
+	hit_audio.play()
+	_hit_sound_time_left = hit_sound_cooldown

game/scenes/Vehicles/car.tscn

@@ -3,6 +3,13 @@
 [ext_resource type="Script" uid="uid://4qf5yinepytc" path="res://scenes/Vehicles/car.gd" id="1_kbd20"]
 [ext_resource type="PackedScene" uid="uid://dvgiooankbnw3" path="res://assets/models/vehicles/doge/doge-body.glb" id="2_doge_body"]
 [ext_resource type="PackedScene" uid="uid://civr7hlbf2kqb" path="res://assets/models/vehicles/doge/Wheel.glb" id="3_doge_wheel"]
+[ext_resource type="AudioStream" path="res://assets/audio/vehicles/car/car_engine_idle_loop.wav" id="4_engine_idle"]
+[ext_resource type="AudioStream" path="res://assets/audio/vehicles/car/car_engine_drive_loop.wav" id="5_engine_drive"]
+[ext_resource type="AudioStream" path="res://assets/audio/vehicles/car/car_engine_accel_loop.wav" id="6_engine_accel"]
+[ext_resource type="AudioStream" path="res://assets/audio/vehicles/car/car_enter.wav" id="7_enter"]
+[ext_resource type="AudioStream" path="res://assets/audio/vehicles/car/car_exit.wav" id="8_exit"]
+[ext_resource type="AudioStream" path="res://assets/audio/vehicles/car/car_brake.wav" id="9_brake"]
+[ext_resource type="AudioStream" path="res://assets/audio/vehicles/car/car_hit.wav" id="10_hit"]
 
 [sub_resource type="BoxShape3D" id="BoxShape3D_body_center"]
 size = Vector3(1.9717, 1, 2.08592)
@@ -71,3 +78,54 @@ transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 1.3, 0, 0)
 
 [node name="CarCamera" type="Camera3D" parent="." unique_id=1783366397]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 2, 4.2)
+
+[node name="Audio" type="Node3D" parent="."]
+
+[node name="EngineIdle" type="AudioStreamPlayer3D" parent="Audio"]
+stream = ExtResource("4_engine_idle")
+volume_db = -80.0
+bus = &"SFX"
+unit_size = 6.0
+max_distance = 45.0
+
+[node name="EngineDrive" type="AudioStreamPlayer3D" parent="Audio"]
+stream = ExtResource("5_engine_drive")
+volume_db = -80.0
+bus = &"SFX"
+unit_size = 6.0
+max_distance = 55.0
+
+[node name="EngineAccel" type="AudioStreamPlayer3D" parent="Audio"]
+stream = ExtResource("6_engine_accel")
+volume_db = -80.0
+bus = &"SFX"
+unit_size = 6.0
+max_distance = 60.0
+
+[node name="Enter" type="AudioStreamPlayer3D" parent="Audio"]
+stream = ExtResource("7_enter")
+volume_db = -7.0
+bus = &"SFX"
+unit_size = 5.0
+max_distance = 25.0
+
+[node name="Exit" type="AudioStreamPlayer3D" parent="Audio"]
+stream = ExtResource("8_exit")
+volume_db = -7.0
+bus = &"SFX"
+unit_size = 5.0
+max_distance = 25.0
+
+[node name="Brake" type="AudioStreamPlayer3D" parent="Audio"]
+stream = ExtResource("9_brake")
+volume_db = -5.0
+bus = &"SFX"
+unit_size = 5.0
+max_distance = 35.0
+
+[node name="Hit" type="AudioStreamPlayer3D" parent="Audio"]
+stream = ExtResource("10_hit")
+volume_db = -6.0
+bus = &"SFX"
+unit_size = 7.0
+max_distance = 45.0