local BGs={
	none={
		draw=function()
			love.graphics.clear(.15,.15,.15)
		end
	}
}
local BGlist={"none"}
local BG={
	cur="none",
	default="none",
	init=false,
	resize=false,
	update=NULL,
	draw=BGs.none.draw,
	event=false,
	discard=NULL,
}

function BG.add(name,bg)
	BGs[name]=bg
	BGlist[#BGlist+1]=name
end
function BG.getList()
	return BGlist
end
function BG.send(...)
	if BG.event then
		BG.event(...)
	end
end
function BG.setDefault(bg)
	BG.default=bg
end
function BG.set(background)
	if not background then background=BG.default end
	if not BGs[background]or not SETTING.bg then return end
	if background~=BG.cur then
		BG.discard()
		BG.cur=background
		background=BGs[background]

		BG.init=	background.init or NULL
		BG.resize=	background.resize or NULL
		BG.update=	background.update or NULL
		BG.draw=	background.draw or NULL
		BG.event=	background.event or NULL
		BG.discard=	background.discard or NULL
		BG.init()
	end
	return true
end
return BG