add palette size to room config

scenes/room/room_config.gd

@@ -22,6 +22,8 @@ class_name RoomConfig extends Resource
 @export var modulate_color: Color
 ## Color palette for the room.
 @export var room_palette: Texture2D = preload("uid://h5523ru86vrd")
+## Number of colors in palette.
+@export var palette_size: int = 120
 
 @export_group('Room Loop')
 ## Whether the room loops itself or not.

scenes/room/states/room_entering.gd

@@ -15,6 +15,7 @@ func _enter(_previous_state_path: String, _data: Dictionary = {}) -> void:
 	var ps_material: ShaderMaterial = room.palette_shader.material as ShaderMaterial
 	assert(ps_material != null, "palette shader is null")
 	ps_material.set_shader_parameter("palette", room.config.room_palette)
+	ps_material.set_shader_parameter("palette_size", room.config.palette_size)
 	
 	room.player.enable_point_light(true, 0.4)
 	room.player.point_light.texture_scale = 0