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