add noise shader to laser graphics

objects/enemy/laser_wall.gd

@@ -6,6 +6,7 @@ export var laser_time = 0.5
 onready var line = $Laser
 onready var cast = $RayCast2D
 onready var timer = $Timer
+onready var sparks = $SparkParticles
 
 func _ready():
 	_disable_laser()
@@ -14,11 +15,15 @@ func _physics_process(delta):
 	if cast.is_colliding():
 		line.points[1].y = line.to_local(cast.get_collision_point()).y
 		line.visible = true
+		sparks.global_position.y = cast.get_collision_point().y
+		sparks.emitting = true
+		
 		var collider = cast.get_collider()
 		if collider.is_in_group("player"):
 			collider.get_parent().die()
 	else:
 		line.visible = false
+		sparks.emitting = false
 
 func _enable_laser():
 	cast.enabled = true