extends ColorRect

# Feeds the lunar shader the camera's position split into a CELL INDEX plus
# a fraction within that cell, rather than a raw world position. See the
# long note in Starfield.gd for why - identical reasoning, identical split.

@onready var camera: Camera2D = get_node("../../Camera2D")


func _process(_delta: float) -> void:
	var viewport_size: Vector2 = get_viewport_rect().size
	var cell_size: float = material.get_shader_parameter("cell_size")
	var p: Vector2 = camera.global_position / cell_size
	var cell: Vector2 = Vector2(floor(p.x), floor(p.y))

	material.set_shader_parameter("camera_cell", cell)
	material.set_shader_parameter("camera_frac", p - cell)
	material.set_shader_parameter("camera_zoom", 1.0 / camera.zoom.x)
	material.set_shader_parameter("viewport_size", viewport_size)