main.lua

local sdl = require 'sdl2'
local ffi = require 'ffi' 

local SCREEN_WIDTH = 640
local SCREEN_HEIGHT = 480

local gWindow = nil
local gScreenSurface = nil
local gHelloWorld = nil

function initSDLWindow()
	gWindow = sdl.createWindow(
		"SDL Tutorial", 
		sdl.WINDOWPOS_CENTERED, 
		sdl.WINDOWPOS_CENTERED, 
		SCREEN_WIDTH, 
		SCREEN_HEIGHT,
		sdl.WINDOW_SHOWN
	)
	if gWindow then
		return true
	else
		print('teste')
		return false
	end
end

function init()
	if sdl.init(sdl.INIT_VIDEO) < 0 then
		print 'SDL_INIT mau sucedido'
		return false
	end
	if not initSDLWindow() then
		return false
	end
	gScreenSurface = sdl.getWindowSurface( gWindow )
	return true
end

function loadMedia()
	gHelloWorld = sdl.loadBMP('example_merged.bmp')
	if not gHelloWorld then
		print('Unable to load File')
		return false
	end
	return true
end

function close()
	sdl.freeSurface( gHelloWorld )
	gHelloWorld = nil
	
	sdl.destroyWindow(gWindow)
	gWindow = nil
	
	sdl.quit()
end

function main()
	if not init() then
		print 'failed to initialize'
		return
	end
	if not loadMedia() then
		print 'failed to load media'
		return
	end
	local quit = false
	local e = ffi.new('SDL_Event')
	sdl.blitSurface(gHelloWorld, nil, gScreenSurface, nil)
	sdl.updateWindowSurface(gWindow)
	
	while not quit do
		while sdl.pollEvent(e) ~= 0 do
			if e.type == sdl.QUIT then
				quit = true
			end
		end
	end
	close()
end
main()