LÖVE

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bitser = require 'bitser'

drawReg = {}
regIndex = 1

function love.load()
	love.filesystem.setIdentity('megaAttackGame');
end

function love.update(dt)
	if love.keyboard.isDown("escape") then
		success = bitser.dumpLoveFile('replay.dat', drawReg )
		love.event.quit()
	elseif love.keyboard.isDown("r") then
		replayData = bitser.loadLoveFile('replaySave2.dat')
	end
end

function love.draw(dt)
	for i=1,500 do
		registerVisible( 1, 1, "thing")
	end
end

function registerVisible( xPos, yPos, thingToDraw )
	drawReg[regIndex] = {
		timeStamp = os.clock(),
		x = xPos,
		y = yPos,
		t = thingToDraw
	}
	regIndex = regIndex + 1
	--Full version of function draws the thing as well
end

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success = bitser.dumpLoveFile('replay.dat', drawReg )

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function save(path, events)
local s = { "return {" }
for i,v in ipairs(events) do
-- You'd handle different types of vars differently, like saving "true" or "false" strings for bools, enclosing strings with ', etc...
table.insert(s,('%16.16g'):format(v)) -- for numbers, for example.
end
-- close off the table.
table.insert("}")
-- then write it out into a file, using table.concat or not; with will waste a bit of memory, without will maybe take a bit longer (writing things at once vs. everything sequentially, depends on buffers and stuff, not that important)
end