extends Camera

# Turns an ARVRCamera node on when Virtual Reality is active
#
# As of Godot 3.0.2, using an ARVRCamera without VR fills you error log with this
#
#   Condition 'arvr_interface.is_null()' is true. returned: Vector<Plane>()
#
# This silly component turns of the ARVRCamera on only when virtual reality is active

# -------------------------------------------------------------------------------------------------

# Manager that controls initialization and shutdown of virtual reality
var virtualRealityManager

# -------------------------------------------------------------------------------------------------

# Initializes the script component when the node is added to the scene
func _ready():
	InitializeIfNotYetDone()
	
	if self.virtualRealityManager == null:
		onVirtualRealityToggled(false)
	else:
		onVirtualRealityToggled(self.virtualRealityManager.IsVirtualRealityActive())

# -------------------------------------------------------------------------------------------------

# Initializes virtual reality if this hasn't already happened
# @remarks
#   With this method, other components can avoid having to depend on an initialization
#   order that needs to be set up behind the scenes (and that would have no documentation
#   in an obvious place to indicate that)
func InitializeIfNotYetDone():
	if self.virtualRealityManager == null:
		self.virtualRealityManager = get_node("/root/Systems/VirtualRealityManager")
		
		if self.virtualRealityManager != null:
			self.virtualRealityManager.InitializeIfNotYetDone()
			self.virtualRealityManager.connect(
				"VirtualRealityToggled", self, "onVirtualRealityToggled"
			)

# -------------------------------------------------------------------------------------------------

# Called when virtual reality is activated or shut down
# @param  state  Whether virtual reality is now active or not
func onVirtualRealityToggled(var state):
	if state:
		self.make_current()
	else:
		self.clear_current()
	
	self.visible = state