func main() {

	if !glfw.Init() {
		log.Fatal("glfw failed to initialize")
	}
	defer glfw.Terminate()

	window, err := glfw.CreateWindow(640, 480, "Deformable", nil, nil)
	if err != nil {
		log.Fatal(err.Error())
	}

	window.MakeContextCurrent()
	glfw.SwapInterval(1)
	window.SetMouseButtonCallback(handleMouseButton)
	window.SetKeyCallback(handleKeyDown)
	window.SetInputMode(glfw.Cursor, glfw.CursorHidden)

	gl.Init()
	initGL()

	i := 16
	m = GenerateMap(1600/i, 1200/i, i)
	for running && !window.ShouldClose() {

		x, y := window.GetCursorPosition()

		if drawing != 0 {
			m.Add(int(x)+int(camera[0]), int(y)+int(camera[1]), drawing, brushSizes[currentBrushSize])
		}

		gl.Clear(gl.COLOR_BUFFER_BIT)
		gl.LoadIdentity()

		gl.PushMatrix()
		gl.PushAttrib(gl.CURRENT_BIT | gl.ENABLE_BIT | gl.LIGHTING_BIT | gl.POLYGON_BIT | gl.LINE_BIT)
		gl.Translatef(-camera[0], -camera[1], 0)
		m.Draw()
		gl.PopAttrib()
		gl.PopMatrix()

		gl.PushAttrib(gl.COLOR_BUFFER_BIT)
		gl.LineWidth(2)
		gl.Enable(gl.BLEND)
		gl.BlendFunc(gl.ONE_MINUS_DST_COLOR, gl.ZERO)
		// gl.Enable(gl.LINE_SMOOTH)
		// gl.Hint(gl.LINE_SMOOTH_HINT, gl.NICEST)

		gl.Translatef(float32(x), float32(y), 0)

		gl.EnableClientState(gl.VERTEX_ARRAY)
		gl.VertexPointer(2, gl.DOUBLE, 0, cursorVerts)
		gl.DrawArrays(gl.LINE_LOOP, 0, 24)
		gl.PopAttrib()

		window.SwapBuffers()
		glfw.PollEvents()
	}

}

func main() {
	glfw.SetErrorCallback(errorCallback)

	if !glfw.Init() {
		panic("Can't init glfw!")
	}
	defer glfw.Terminate()

	window, err := glfw.CreateWindow(800, 640, "MyGui", nil, nil)
	if err != nil {
		panic(err)
	}
	window.MakeContextCurrent()

	glfw.SwapInterval(1)
	gl.Init()

	mvp := prepareModelViewProjection(800, 640)

	prepareScene()
	dt := float64(0)
	glfw.SetTime(dt)

	for !window.ShouldClose() {
		dt = glfw.GetTime()
		glfw.SetTime(0)
		updateScene(dt)
		drawScene(mvp, dt)
		window.SwapBuffers()
		glfw.PollEvents()
	}
}

// Run should be called by your main function, and will block
// indefinitely. This is necessary because some platforms expect calls
// from the main thread.
func Run() {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()
	// ensure we have at least 2 procs, due to the thread conditions we
	// have to work with.
	procs := runtime.GOMAXPROCS(0)
	if procs < 2 {
		runtime.GOMAXPROCS(2)
	}

	glfw.Init()
	defer glfw.Terminate()
	setupGlfw()

	mainchan := make(chan func(), 32)
	mainc = mainchan

	for {
		select {
		case fn := <-mainchan:
			fn()
		default:
			glfw.WaitEvents()
		}
	}
}

func OpenWindow(width, height int, caption string) *glfw.Window {
	// OpenGL haluaa että sitä käytetään aina samasta threadista
	// muuten tulee satunnaisia segfaultteja
	runtime.LockOSThread()

	glfw.Init()

	// luodaan ikkuna
	w, err := glfw.CreateWindow(width, height, caption, nil, nil)
	if err != nil {
		log.Fatal(err)
	}
	w.MakeContextCurrent()

	gl.Init()

	// Jotta painalluksista kerrottaisiin vaikka ne olisivat jo päättyneet
	w.SetInputMode(glfw.StickyKeys, glfw.True)
	w.SetInputMode(glfw.StickyMouseButtons, glfw.True)

	// läpinäkyvyys päälle (non-premultiplied alpha)
	gl.Enable(gl.BLEND)
	gl.BlendEquationSeparate(gl.FUNC_ADD, gl.FUNC_ADD)
	gl.BlendFuncSeparate(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ZERO)

	return w
}

func main() {
	glfw.SetErrorCallback(glfwErrorCallback)
	if !glfw.Init() {
		panic("failed to initialize glfw")
	}
	defer glfw.Terminate()

	glfw.WindowHint(glfw.Resizable, glfw.False)
	glfw.WindowHint(glfw.ContextVersionMajor, 2)
	glfw.WindowHint(glfw.ContextVersionMinor, 1)
	window, err := glfw.CreateWindow(800, 600, "Cube", nil, nil)
	if err != nil {
		panic(err)
	}
	window.MakeContextCurrent()

	if err := gl.Init(); err != nil {
		panic(err)
	}

	texture = newTexture("square.png")
	defer gl.DeleteTextures(1, &texture)

	setupScene()
	for !window.ShouldClose() {
		drawScene()
		window.SwapBuffers()
		glfw.PollEvents()
	}
}

func main() {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()
	defer glfw.Terminate()

	gorgasm.Verbose = true

	if !glfw.Init() {
		panic("Can't init glfw!")
	}

	// Enable OpenGL ES 2.0.
	glfw.WindowHint(glfw.ClientApi, glfw.OpenglEsApi)
	glfw.WindowHint(glfw.ContextVersionMajor, 2)
	window, err := glfw.CreateWindow(testlib.Width, testlib.Height, "Gorgasm Test", nil, nil)
	if err != nil {
		panic(err)
	}

	gorgasm.Init(window)

	go prettytest.Run(new(testing.T), testlib.NewTestSuite())

	for !window.ShouldClose() {
		glfw.WaitEvents()
	}
}

func main() {
	runtime.LockOSThread()
	defer runtime.UnlockOSThread()
	defer glfw.Terminate()

	mandala.Verbose = true

	if !glfw.Init() {
		panic("Can't init glfw!")
	}

	// Enable OpenGL ES 2.0.
	glfw.WindowHint(glfw.ClientApi, glfw.OpenglEsApi)
	glfw.WindowHint(glfw.ContextVersionMajor, 2)
	window, err := glfw.CreateWindow(Width, Height, "gltext black-box testing", nil, nil)
	if err != nil {
		panic(err)
	}

	glfw.SwapInterval(0)
	mandala.Init(window)

	go prettytest.Run(new(testing.T), testlib.NewTestSuite(outputPath))

	for !window.ShouldClose() {
		glfw.WaitEvents()
	}
}

func main() {
	runtime.LockOSThread()

	if !glfw.Init() {
		fmt.Fprintf(os.Stderr, "Can't open GLFW")
		return
	}
	defer glfw.Terminate()

	glfw.WindowHint(glfw.Samples, 4)
	glfw.WindowHint(glfw.ContextVersionMajor, 3)
	glfw.WindowHint(glfw.ContextVersionMinor, 3)
	glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
	glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True) // needed for macs

	window, err := glfw.CreateWindow(1024, 768, "Tutorial 1", nil, nil)
	if err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		return
	}

	window.MakeContextCurrent()

	gl.Init()
	gl.GetError() // Ignore error
	window.SetInputMode(glfw.StickyKeys, 1)

	gl.ClearColor(0., 0., 0.4, 0.)
	// Equivalent to a do... while
	for ok := true; ok; ok = (window.GetKey(glfw.KeyEscape) != glfw.Press && !window.ShouldClose()) {
		window.SwapBuffers()
		glfw.PollEvents()
	}

}

func main() {
	glfw.SetErrorCallback(errorCallback)

	if !glfw.Init() {
		panic("Can't init glfw")
	}
	defer glfw.Terminate()

	window, err := glfw.CreateWindow(640, 480, "Testing", nil, nil)
	if err != nil {
		panic(err)
	}

	window.MakeContextCurrent()
	window.SetSizeCallback(copiedReshape)
	window.SetKeyCallback(keyHandler)

	copiedInit()
	running := true
	for running && !window.ShouldClose() {
		//copiedDrawCube(angle)
		redraw()
		window.SwapBuffers()
		glfw.PollEvents()
		running = window.GetKey(glfw.KeyEscape) == glfw.Release
	}
}

func main() {
	glfw.SetErrorCallback(errorCallback)

	if !glfw.Init() {
		panic("Can't init glfw!")
	}
	defer glfw.Terminate()

	window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
	if err != nil {
		panic(err)
	}

	window.MakeContextCurrent()

	glfw.SwapInterval(1)

	gl.Init()

	if err := initScene(); err != nil {
		fmt.Fprintf(os.Stderr, "init: %s\n", err)
		return
	}
	defer destroyScene()

	for !window.ShouldClose() {
		drawScene()
		window.SwapBuffers()
		glfw.PollEvents()
	}
}

func main() {
	fmt.Println("Init GLFW3")
	if glfw3.Init() {
		fmt.Println("Init ok")
		defer closeGLFW()
	}

	// Create the window
	fmt.Println("Opening window")
	win, err := glfw3.CreateWindow(1024, 768, "Kunos Rulez", nil, nil)
	gl.Init()
	if err != nil {
		fmt.Println(err)
	} else {
		fmt.Println("ok", win)
	}

	win.MakeContextCurrent()

	for win.ShouldClose() == false {
		glfw3.PollEvents()
		gl.ClearColor(1.0, 0.0, 0.0, 1.0)
		gl.Clear(gl.COLOR_BUFFER_BIT)

		win.SwapBuffers()
	}

	fmt.Println("Destroying win")
	win.Destroy()
}

// Initialize creates new window
func (e *E) Initialize(title string, params Params, state State) error {
	if !glfw3.Init() {
		return fmt.Errorf("unable to initialize glfw")
	}
	if e.window != nil {
		return fmt.Errorf("Initialize error: window is not nil")
	}

	glfw3.SetErrorCallback(OnError)

	glfw3.WindowHint(glfw3.Resizable, glfw3.True)
	glfw3.WindowHint(glfw3.ContextVersionMajor, params.Version[0])
	glfw3.WindowHint(glfw3.ContextVersionMinor, params.Version[1])
	glfw3.WindowHint(glfw3.OpenglProfile, glfw3.OpenglCoreProfile)
	glfw3.WindowHint(glfw3.OpenglDebugContext, glfw3.True)

	size := params.Size
	window, err := glfw3.CreateWindow(size[0], size[1], title, nil, nil)
	if err != nil {
		return err
	}

	window.MakeContextCurrent()
	window.SetKeyCallback(e.OnKey)
	window.SetFramebufferSizeCallback(e.OnFramebufferResize)

	e.window = window
	e.state = state

	return nil
}

func RunIn3DContext(example func()) {
	if !glfw.Init() {
		log.Panic("glfw Error")
	}
	defer glfw.Terminate()

	glfw.WindowHint(glfw.ContextVersionMajor, 3)
	glfw.WindowHint(glfw.ContextVersionMinor, 3)
	glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True)
	glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)

	w, h := 100, 100
	window, err := glfw.CreateWindow(w, h, "Test", nil, nil)
	if err != nil {
		log.Panic(err)
	}
	window.MakeContextCurrent()

	if gl.Init() != 0 {
		log.Panic("gl error")
	}
	gl.GetError()

	vertexArray := gl.GenVertexArray()
	vertexArray.Bind()

	example()
}

func main() {
	_ = fmt.Sprint()

	if !glfw.Init() {
		panic("Can't init glfw!")
	}
	defer glfw.Terminate()

	// antialiasing
	//glfw.WindowHint(glfw.Samples, 4)

	window, err = glfw.CreateWindow(WindowWidth, WindowHeight, "Mozaik", nil, nil)
	if err != nil {
		panic(err)
	}
	defer window.Destroy()

	// Ensure thread context
	window.MakeContextCurrent()
	//glfw.SwapInterval(1)

	window.SetKeyCallback(keyCb)
	window.SetMouseButtonCallback(mouseCb)

	gl.Init()
	gl.ClearColor(0.9, 0.85, 0.46, 0.0)
	// useless in 2D
	gl.Disable(gl.DEPTH_TEST)
	// antialiasing
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.Enable(gl.LINE_SMOOTH)

	for i := int32(32); i < 72; i++ {
		font := loadFonts(i)
		defer font.Release()
		fonts = append(fonts, font)
	}

	// Compute window radius
	windowRadius = math.Sqrt(math.Pow(WindowHeight, 2) + math.Pow(WindowWidth, 2))

	// Use window coordinates
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Ortho(0, WindowWidth, WindowHeight, 0, 0, 1)
	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()

	g = NewGame()

	g.Start()
	go eventLoop(g)
	go renderLoop(g)
	Main()
	g.Stop()
}

func init() {
	if !glfw.Init() {
		panic("Cannot initialize windowing library.")
	}

	e := gl.Init()
	if e != nil {
		panic(e)
	}
}

func (self *OpenGLWindow) Open() {
	var err error
	if !glfw.Init() {
		panic(errors.New("Unable to initialize GLFW"))
	}

	glfw.SetErrorCallback(func(code glfw.ErrorCode, desc string) {
		log.Printf("[GLFW Error] (%d) %s", code, desc)
	})

	var monitor *glfw.Monitor
	if self.config.Fullscreen {
		monitor, err = glfw.GetPrimaryMonitor()

		if err != nil {
			panic(err)
		}
	}

	glfw.WindowHint(glfw.ContextVersionMajor, 4)
	glfw.WindowHint(glfw.ContextVersionMinor, 1)
	glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
	glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True)

	// Default buffer sizes
	glfw.WindowHint(glfw.DepthBits, 32)
	glfw.WindowHint(glfw.StencilBits, 0)

	// Toggle VSync. Turning VSync off aparently doesn't work via glfw through
	// some ATI cards and drivers
	if self.config.VSync {
		glfw.SwapInterval(1)
	} else {
		glfw.SwapInterval(0)
	}

	self.window, err = glfw.CreateWindow(
		int(self.config.Width), int(self.config.Height),
		"Project Slartibartfast",
		monitor,
		nil)

	if err != nil {
		panic(err)
	}

	self.window.MakeContextCurrent()

	if glewError := gl.Init(); glewError != 0 {
		panic(errors.New("Unable to initialize OpenGL"))
	}
}

func main() {
	runtime.LockOSThread()
	glfw.SetErrorCallback(errorCallback)

	if !glfw.Init() {
		panic("can't init glfw!")
	}
	defer glfw.Terminate()

	var window *glfw.Window = initGame()
	runGameLoop(window)

	fmt.Printf("Your highscore was %d points!\n", highscore)
}

//NewWindow creates and return a new Window
func NewWindow(b RenderBackend, w, h int, title string) *Window {
	glfw.SetErrorCallback(errorCallback)

	if !glfw.Init() {
		panic("Can't init glfw!")
	}

	window, err := glfw.CreateWindow(w, h, title, nil, nil)
	if err != nil {
		panic(err)
	}

	window.MakeContextCurrent()
	b.Init(w, h)
	setupGL(w, h)

	return &Window{window, b, gs.NewRootElement()}
}

// ListenForEvents should be called by your main function, and will
// block indefinitely. This is necessary because some platforms expect
// calls from the main thread.
func ListenForEvents() error {
	// ensure we have at least 2 procs, due to the thread conditions we
	// have to work with.
	procs := runtime.GOMAXPROCS(0)
	if procs < 2 {
		runtime.GOMAXPROCS(2)
	}

	glfw.Init()
	defer glfw.Terminate()
	setupGlfw()

	t0 := time.Now()
	for {
		select {
		case fn, ok := <-mainc:
			if !ok {
				return nil
			}
			fn()
		default:
			// when under heavy activity, sleep and poll instead to
			// lessen sysmon() churn in Go's scheduler. with this
			// method, OS X's Activity Monitor reports over 1000 sleeps
			// a second, which is ridiculous, but better than 3000.
			// haven't been able to create a minimal reproduction of
			// this, but when tweaking values in runtime/proc.c's sysmon
			// func, it is obvious this is a scheduler issue.
			// TODO: best workaround is probably to write this entire
			// loop in C, which should keep the sysmon thread from
			// waking up (from these syscalls, anyways).
			dt := time.Now().Sub(t0)
			if dt < 150*time.Millisecond {
				time.Sleep(15 * time.Millisecond)
				glfw.PollEvents()
			} else {
				t0 = time.Now()
				glfw.WaitEvents()
			}
		}
	}
	return nil
}

func main() {
	runtime.LockOSThread()

	glfw.SetErrorCallback(errorCallback)

	if !glfw.Init() {
		panic("Can't init glfw!")
	}
	defer glfw.Terminate()

	// must be done in main thread or we get a nasty stderr message from glfw,
	// although it does seem to 'work'
	window, err := glfw.CreateWindow(Width, Height, Title, nil, nil)
	if err != nil {
		panic(err)
	}

	// separate thread for drawing so that we don't block on the event thread.
	// most obvious benefit is that we continue to render during window
	// resizes.
	go func() {
		runtime.LockOSThread()

		window.MakeContextCurrent()
		glfw.SwapInterval(1)
		gl.Init()
		if err := initScene(); err != nil {
			fmt.Fprintf(os.Stderr, "init: %s\n", err)
			return
		}

		for !window.ShouldClose() {
			drawScene()
			window.SwapBuffers()
		}
		os.Exit(0)
	}()

	for {
		glfw.WaitEvents()
	}
}