love_run.lua

function love.run()
	if love.load then love.load(love.arg.parseGameArguments(arg), arg) end
 
	-- We don't want the first frame's dt to include time taken by love.load.
	if love.timer then love.timer.step() end
 
	local dt = 0
 
	-- Main loop time.
    return function()
        local start_time = love.timer.getTime()
		-- Process events.
		if love.event then
			love.event.pump()
			for name, a,b,c,d,e,f in love.event.poll() do
				if name == "quit" then
					if not love.quit or not love.quit() then
						return a or 0
					end
				end
				love.handlers[name](a,b,c,d,e,f)
			end
		end
 
		-- Update dt, as we'll be passing it to update
		if love.timer then dt = love.timer.step() end
 
		-- Call update and draw
		if love.update then love.update(dt) end -- will pass 0 if love.timer is disabled
 
		if love.graphics and love.graphics.isActive() then
			love.graphics.origin()
			love.graphics.clear(love.graphics.getBackgroundColor())
 
			if love.draw then love.draw() end
 
			love.graphics.present()
		end
		
        local end_time = love.timer.getTime()
        local frame_time = end_time - start_time

		if love.timer then
			if dbg.fps_cap then
				love.timer.sleep(1/60-frame_time)
			else
				love.timer.sleep(0.001)
			end
        end
	end
end