114 lines
3.3 KiB
GDScript
114 lines
3.3 KiB
GDScript
extends Camera3D
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# Modifier keys' speed multiplier
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const SHIFT_MULTIPLIER = 2.5
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const ALT_MULTIPLIER = 1.0 / SHIFT_MULTIPLIER
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@export var sensitivity : float = 0.25
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# Mouse state
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var _mouse_position = Vector2(0.0, 0.0)
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var _total_pitch = 0.0
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# Movement state
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var _direction = Vector3(0.0, 0.0, 0.0)
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var _velocity = Vector3(0.0, 0.0, 0.0)
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var _acceleration = 30
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var _deceleration = -10
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var _vel_multiplier = 4
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# Keyboard state
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var _w = false
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var _s = false
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var _a = false
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var _d = false
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var _q = false
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var _e = false
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var _shift = false
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var _alt = false
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func _input(event):
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# Receives mouse motion
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if event is InputEventMouseMotion:
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_mouse_position = event.relative
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# Receives mouse button input
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if event is InputEventMouseButton:
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match event.button_index:
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MOUSE_BUTTON_RIGHT: # Only allows rotation if right click down
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Input.set_mouse_mode(Input.MOUSE_MODE_CAPTURED if event.pressed else Input.MOUSE_MODE_VISIBLE)
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MOUSE_BUTTON_WHEEL_UP: # Increases max velocity
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_vel_multiplier = clamp(_vel_multiplier * 1.1, 0.2, 20)
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MOUSE_BUTTON_WHEEL_DOWN: # Decereases max velocity
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_vel_multiplier = clamp(_vel_multiplier / 1.1, 0.2, 20)
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# Receives key input
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if event is InputEventKey:
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match event.keycode:
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KEY_W:
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_w = event.pressed
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KEY_S:
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_s = event.pressed
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KEY_A:
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_a = event.pressed
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KEY_D:
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_d = event.pressed
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KEY_Q:
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_q = event.pressed
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KEY_E:
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_e = event.pressed
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KEY_SHIFT:
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_shift = event.pressed
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KEY_ALT:
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_alt = event.pressed
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# Updates mouselook and movement every frame
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func _physics_process(delta):
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_update_mouselook()
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_update_movement(delta)
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# Updates camera movement
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func _update_movement(delta):
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# Computes desired direction from key states
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_direction = Vector3(float(_d) - float(_a),
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float(_e) - float(_q),
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float(_s) - float(_w))
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# Computes the change in velocity due to desired direction and "drag"
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# The "drag" is a constant acceleration on the camera to bring it's velocity to 0
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var offset = _direction.normalized() * _acceleration * _vel_multiplier * delta \
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+ _velocity.normalized() * _deceleration * _vel_multiplier * delta
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# Compute modifiers' speed multiplier
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var speed_multi = 1
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if _shift: speed_multi *= SHIFT_MULTIPLIER
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if _alt: speed_multi *= ALT_MULTIPLIER
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# Checks if we should bother translating the camera
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if _direction == Vector3.ZERO and offset.length_squared() > _velocity.length_squared():
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# Sets the velocity to 0 to prevent jittering due to imperfect deceleration
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_velocity = Vector3.ZERO
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else:
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# Clamps speed to stay within maximum value (_vel_multiplier)
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_velocity.x = clamp(_velocity.x + offset.x, -_vel_multiplier, _vel_multiplier)
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_velocity.y = clamp(_velocity.y + offset.y, -_vel_multiplier, _vel_multiplier)
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_velocity.z = clamp(_velocity.z + offset.z, -_vel_multiplier, _vel_multiplier)
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translate(_velocity * delta * speed_multi)
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# Updates mouse look
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func _update_mouselook():
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# Only rotates mouse if the mouse is captured
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if Input.get_mouse_mode() == Input.MOUSE_MODE_CAPTURED:
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_mouse_position *= sensitivity
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var yaw = _mouse_position.x
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var pitch = _mouse_position.y
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_mouse_position = Vector2(0, 0)
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# Prevents looking up/down too far
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pitch = clamp(pitch, -90 - _total_pitch, 90 - _total_pitch)
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_total_pitch += pitch
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rotate_y(deg_to_rad(-yaw))
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rotate_object_local(Vector3(1,0,0), deg_to_rad(-pitch))
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