extends SceneTree

# Not a test - a stopwatch. Splits the fixed cost every scene-based test pays
# before it can assert anything, so tuning aims at the part that is actually
# expensive.
#   godot --headless -s res://tests/_profile_startup.gd

var scene: Node
var t0: int = 0
var frames: int = 0
var frame_start: int = 0


func _initialize() -> void:
	var boot: int = Time.get_ticks_msec()
	print("engine boot to _initialize: %d ms" % boot)

	t0 = Time.get_ticks_msec()
	var packed: PackedScene = load("res://Main.tscn")
	print("load(Main.tscn):          %d ms" % (Time.get_ticks_msec() - t0))

	t0 = Time.get_ticks_msec()
	scene = packed.instantiate()
	print("instantiate():            %d ms" % (Time.get_ticks_msec() - t0))

	t0 = Time.get_ticks_msec()
	root.add_child(scene)
	print("add_child() (_ready):     %d ms" % (Time.get_ticks_msec() - t0))

	frame_start = Time.get_ticks_msec()


func _process(_delta: float) -> bool:
	frames += 1
	if frames < 60:
		return false
	var span: int = Time.get_ticks_msec() - frame_start
	print("60 frames:                %d ms (%.1f fps)" % [span, 60000.0 / maxf(span, 1)])
	quit(0)
	return true