bugged-racing/vehicles/vehicle.gd

262 lines
7.7 KiB
GDScript

class_name BuggedVehicle
extends VehicleBody
signal speed_updated(speed_kph, speed_percent)
signal rpm_updated(rpm, rpm_percent)
signal throttle_updated(throttle_percent)
signal brake_updated(brake_percent)
signal clutch_updated(clutch_percent)
signal gear_updated(gear)
signal steering_updated(steering_angle, steering_percent)
export(float) var max_steer_angle = 25
export(float) var speed_steer_angle = 10
export(float) var max_steer_speed = 100.0
export(float) var max_steer_input = 80.0
export(float) var max_engine_force = 85.0
export(float) var max_brake_force = 50.0
export(float) var throttle_power = 6000.0
export(float) var max_rpm_loss_ps = 3000.0
export(float) var base_engine_pitch = 0.5
export(float) var expected_max_speed = 200
export(Array) var gear_ratios = [3.4, 2.5, 2.0, 1.5, 1.25]
export(float) var reverse_ratio = -3
export(float) var final_drive = 3.45
export(float) var max_rpm = 3500
export(float) var min_rpm = 900
export(float) var gear_switch_time = 0.2
export(Curve) var power_curve = null
export(Curve) var sound_curve = null
export(float) var automatic_gear_up_threshold = 0.8
export(float) var automatic_gear_down_threshold = 0.3
var clutch_position: float = 0.0
var rpm = 0
var gear = 1
var gear_timer = 0
var traction_wheels: Array
var reset_transform: Transform = Transform.IDENTITY
onready var frwheel: VehicleWheel = $front_right
onready var flwheel: VehicleWheel = $front_left
onready var rrwheel: VehicleWheel = $rear_right
onready var rlwheel: VehicleWheel = $rear_left
onready var frsmoke: TireSmoke = $fr_tire_smoke
onready var flsmoke: TireSmoke = $fl_tire_smoke
onready var rrsmoke: TireSmoke = $rr_tire_smoke
onready var rlsmoke: TireSmoke = $rl_tire_smoke
onready var cockpit: Position3D = $cockpit
onready var hood: Position3D = $hood
onready var bumper: Position3D = $bumper
onready var static_follow: Position3D = $static_follow
onready var engine_sound_player: AudioStreamPlayer3D = $engine_sound_player
onready var engine_sound_playback: AudioStreamPlayback = $engine_sound_player.get_stream_playback()
onready var max_steer_angle_rad: float = deg2rad(max_steer_angle)
onready var speed_steer_angle_rad: float = deg2rad(speed_steer_angle)
onready var max_steer_input_rad: float = deg2rad(max_steer_input)
onready var auto_clutch_rpm_limit = max_rpm * automatic_gear_down_threshold
func _ready():
for wheel in [frwheel, flwheel, rrwheel, rlwheel]:
if wheel.use_as_traction:
traction_wheels.append(wheel)
_generate_engine_sound(0)
engine_sound_player.play()
func get_cockpit_position() -> Node:
return cockpit
func get_hood_position() -> Node:
return hood
func get_bumper_position() -> Node:
return bumper
func get_static_follow_position() -> Node:
return static_follow
func _integrate_forces(state: PhysicsDirectBodyState) -> void:
if reset_transform != Transform.IDENTITY:
state.linear_velocity = Vector3.ZERO
state.angular_velocity = Vector3.ZERO
state.set_transform(reset_transform)
reset_transform = Transform.IDENTITY
func _get_gear_ratio():
if gear == 0:
return 0
elif gear == -1:
return reverse_ratio
else:
return gear_ratios[gear - 1]
func _handle_gear_switch(delta: float):
if gear_timer > 0:
gear_timer = max(0, gear_timer - delta)
if clutch_position > 0.8 or GlobalSettings.auto_clutch or GlobalSettings.automatic_transmission:
if Input.is_action_just_pressed("gear_up"):
_gear_up()
if Input.is_action_just_pressed("gear_down"):
_gear_down()
func _gear_up():
if gear + 1 <= gear_ratios.size():
gear += 1
gear_timer = gear_switch_time * (2 - clutch_position)
emit_signal("gear_updated", gear)
func _gear_down():
if gear - 1 >= -1:
gear -= 1
gear_timer = gear_switch_time * (2 - clutch_position)
emit_signal("gear_updated", gear)
func _has_traction():
for wheel in traction_wheels:
if wheel.is_in_contact():
return true
return false
func _update_wheels_smoke():
for wheelnsmoke in [
[frwheel, frsmoke], [flwheel, flsmoke], [rrwheel, rrsmoke], [rlwheel, rlsmoke]
]:
wheelnsmoke[1].update(wheelnsmoke[0].get_skidinfo())
func _lerp_rpm(from, to, delta, factor):
var new_val = lerp(from, to, factor)
if abs(from - new_val) > max_rpm_loss_ps * delta:
var new_factor = inverse_lerp(
from, to, from - sign(from - new_val) * max_rpm_loss_ps * delta
)
new_val = lerp(from, to, new_factor)
return new_val
func _physics_process(delta: float):
_update_wheels_smoke()
clutch_position = Input.get_action_strength("clutch")
_handle_gear_switch(delta)
var throttle = Input.get_action_strength("throttle")
var brake_input = Input.get_action_strength("brake")
var wheel_rpm = traction_wheels[0].get_rpm()
var speed = wheel_rpm * 2.0 * PI * rrwheel.wheel_radius / 60.0 * 3600.0 / 1000.0
if GlobalSettings.automatic_transmission and speed < 1 and gear == 1 and brake_input > 0.1:
_gear_down()
_gear_down()
if GlobalSettings.automatic_transmission and speed > -1 and gear == -1 and throttle > 0.1:
_gear_up()
_gear_up()
if GlobalSettings.automatic_transmission and gear == -1:
var swap = throttle
throttle = brake_input
brake_input = swap
if GlobalSettings.auto_clutch or GlobalSettings.automatic_transmission:
clutch_position = 1 - min(rpm, auto_clutch_rpm_limit) / auto_clutch_rpm_limit
if gear_timer > 0:
clutch_position = 1
throttle = 0
var final_rpm = abs(wheel_rpm) * final_drive
var transmission_rpm = final_rpm * abs(_get_gear_ratio())
if gear != 0:
rpm = lerp(rpm, transmission_rpm, delta * 10 * (1 - clutch_position))
rpm = _lerp_rpm(rpm, min_rpm, delta, delta * clutch_position)
else:
rpm = _lerp_rpm(rpm, min_rpm, delta, delta)
if _has_traction():
rpm += throttle * delta * (max(clutch_position, 1 if gear == 0 else 0)) * throttle_power
else:
rpm += throttle * delta * throttle_power
rpm = clamp(rpm, 0, max_rpm)
var rpm_factor = clamp(rpm / max_rpm, 0.0, 1.0)
var power_factor = power_curve.interpolate_baked(rpm_factor)
_generate_engine_sound(rpm_factor)
# Transfer to transmission
var transmission_input = power_factor * (1 - clutch_position) * _get_gear_ratio()
var final_input = transmission_input * final_drive
emit_signal("throttle_updated", throttle)
emit_signal("brake_updated", brake_input)
emit_signal("clutch_updated", clutch_position)
brake = brake_input * max_brake_force
engine_force = throttle * final_input * max_engine_force
var handbrake = Input.get_action_strength("handbrake")
rrwheel.brake = handbrake * max_brake_force
rlwheel.brake = handbrake * max_brake_force
if GlobalSettings.automatic_transmission and rpm_factor > automatic_gear_up_threshold:
_gear_up()
elif GlobalSettings.automatic_transmission and rpm_factor < automatic_gear_down_threshold:
if gear > 1:
_gear_down()
emit_signal("speed_updated", speed, speed / expected_max_speed)
emit_signal("rpm_updated", rpm, rpm_factor)
var steering_input = (
Input.get_action_strength("steer_left")
- Input.get_action_strength("steer_right")
)
if abs(steering_input) < 0.05:
steering_input = 0.0
var steer_speed_factor = clamp(speed / max_steer_speed, 0.0, 1.0)
steering = steering_input * lerp(max_steer_angle_rad, speed_steer_angle_rad, steer_speed_factor)
emit_signal("steering_updated", steering, steering / max_steer_angle_rad)
func _generate_engine_sound(rpm_factor):
engine_sound_player.pitch_scale = base_engine_pitch + 2 * rpm_factor
var to_fill = engine_sound_playback.get_frames_available()
var factor = rpm_factor
if to_fill <= 0:
return
var fill_segment = 1.0 / to_fill
var fill_percent = 0.0
while to_fill > 0:
engine_sound_playback.push_frame(Vector2(1.0, 1.0) * factor)
factor += (
cos(factor)
* sin(factor)
* (1 + to_fill % 2)
* ((sound_curve.interpolate_baked(fill_percent) - 0.5) * 2)
)
to_fill -= 1
fill_percent += fill_segment