class_name GunkDust extends GPUParticles3D

@export var emit_scale := 0.1

var _last_clear_total := 0.0
var _emitting_this_frame := false


func _on_gunkable_clear_total_updated(clear_total: float) -> void:
	var delta := maxf(clear_total - _last_clear_total, 0)

	amount_ratio = clampf(delta * emit_scale, 0, 1)
	if delta > 0:
		_emitting_this_frame = true

	_last_clear_total = clear_total


func _on_gunkable_painted_at_point(point: Vector3, normal: Vector3) -> void:
	look_at_from_position(point, point + normal, global_basis.y)


func _process(_delta: float) -> void:
	emitting = _emitting_this_frame
	_emitting_this_frame = false