163 lines
5.5 KiB
GDScript
163 lines
5.5 KiB
GDScript
extends VehicleBody
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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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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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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 (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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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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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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var traction_wheels: Array
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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 _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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elif clutch_position > 0.8:
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if Input.is_action_just_pressed("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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if Input.is_action_just_pressed("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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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 [[frwheel, frsmoke], [flwheel, flsmoke], [rrwheel, rrsmoke], [rlwheel, rlsmoke]]:
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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(from, to, from - sign(from - new_val) * MAX_RPM_LOSS_PS * delta)
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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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if gear_timer > 0:
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clutch_position = 1
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throttle = 0
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var wheel_rpm = traction_wheels[0].get_rpm()
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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 = Input.get_action_strength("brake") * 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 / 2
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rlwheel.brake = handbrake * MAX_BRAKE_FORCE / 2
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var speed = wheel_rpm * 2.0 * PI * rrwheel.wheel_radius / 60.0 * 3600.0 / 1000.0
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$Info.text = "Gear: %d, KPH: %.0f, RPM: %.0f, WheelRPM: %.0f, FinalRPM: %.0f, TRPM: %.0f, Engine force: %.0f" % [ gear, speed, rpm, wheel_rpm, final_rpm, transmission_rpm, engine_force ]
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var steering_input = Input.get_action_strength("steer_left") - Input.get_action_strength("steer_right")
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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 += cos(factor) * sin(factor) * (1 + to_fill % 2) * ((sound_curve.interpolate_baked(fill_percent) - 0.5) * 2)
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to_fill -= 1
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fill_percent += fill_segment
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