Refactoring: lazy initializing the application

example/main.go

@@ -59,7 +59,7 @@ func main() {
 		}
 	}()
 
-	//u.MainLoop()
+	u.RunMainLoop()
 
 	for {
 		u.PollEvents()

ui/cocoa/game_window.go

@@ -30,6 +30,7 @@ type GameWindow struct {
 	screenWidth    int
 	screenHeight   int
 	screenScale    int
+	title          string
 	closed         bool
 	native         *C.EbitenGameWindow
 	pressedKeys    map[ui.Key]struct{}
@@ -41,27 +42,30 @@ type GameWindow struct {
 
 var windows = map[*C.EbitenGameWindow]*GameWindow{}
 
-func runGameWindow(graphicsDevice *opengl.Device, width, height, scale int, title string, sharedContext *C.NSOpenGLContext) *GameWindow {
+func newGameWindow(width, height, scale int, title string) *GameWindow {
-	w := &GameWindow{
+	return &GameWindow{
-		graphicsDevice: graphicsDevice,
 		screenWidth:  width,
 		screenHeight: height,
 		screenScale:  scale,
+		title:        title,
 		closed:       false,
 		pressedKeys:  map[ui.Key]struct{}{},
 		funcs:        make(chan func()),
 		funcsDone:    make(chan struct{}),
 	}
+}
 
-	cTitle := C.CString(title)
+func (w *GameWindow) run(graphicsDevice *opengl.Device, sharedContext *C.NSOpenGLContext) {
+	cTitle := C.CString(w.title)
 	defer C.free(unsafe.Pointer(cTitle))
 
 	ch := make(chan struct{})
 	go func() {
 		runtime.LockOSThread()
 		glContext := C.CreateGLContext(sharedContext)
-		w.native = C.CreateGameWindow(C.size_t(width*scale),
+		w.graphicsDevice = graphicsDevice
-			C.size_t(height*scale),
+		w.native = C.CreateGameWindow(C.size_t(w.screenWidth*w.screenScale),
+			C.size_t(w.screenHeight*w.screenScale),
 			cTitle,
 			glContext)
 		windows[w.native] = w
@@ -70,9 +74,9 @@ func runGameWindow(graphicsDevice *opengl.Device, width, height, scale int, titl
 	}()
 	<-ch
 	w.useGLContext(func() {
-		w.context = w.graphicsDevice.CreateContext(width, height, scale)
+		w.context = w.graphicsDevice.CreateContext(
+			w.screenWidth, w.screenHeight, w.screenScale)
 	})
-	return w
 }
 
 func (w *GameWindow) loop() {

ui/cocoa/texture_factory.go

@@ -15,37 +15,45 @@ import (
 )
 
 type textureFactory struct {
-	sharedContext  *C.NSOpenGLContext
+	inited         chan struct{}
 	graphicsDevice *opengl.Device
 	events         chan interface{}
 	funcs          chan func()
 	funcsDone      chan struct{}
+	gameWindows    chan *GameWindow
 }
 
-func runTextureFactory() *textureFactory {
+func newTextureFactory() *textureFactory {
-	t := &textureFactory{
+	return &textureFactory{
+		inited:      make(chan struct{}),
 		funcs:       make(chan func()),
 		funcsDone:   make(chan struct{}),
+		gameWindows: make(chan *GameWindow),
 	}
-	ch := make(chan struct{})
-	go func() {
-		runtime.LockOSThread()
-		t.sharedContext = C.CreateGLContext(nil)
-		close(ch)
-		t.loop()
-	}()
-	<-ch
-	t.useGLContext(func() {
-		t.graphicsDevice = opengl.NewDevice()
-	})
-	return t
 }
 
-func (t *textureFactory) loop() {
+func (t *textureFactory) run() {
+	var sharedContext *C.NSOpenGLContext
+	go func() {
+		runtime.LockOSThread()
+		t.graphicsDevice = opengl.NewDevice()
+		sharedContext = C.CreateGLContext(nil)
+		close(t.inited)
+		t.loop(sharedContext)
+	}()
+	<-t.inited
+	go func() {
+		for w := range t.gameWindows {
+			w.run(t.graphicsDevice, sharedContext)
+		}
+	}()
+}
+
+func (t *textureFactory) loop(sharedContext *C.NSOpenGLContext) {
 	for {
 		select {
 		case f := <-t.funcs:
-			C.UseGLContext(t.sharedContext)
+			C.UseGLContext(sharedContext)
 			f()
 			C.UnuseGLContext()
 			t.funcsDone <- struct{}{}
@@ -59,7 +67,11 @@ func (t *textureFactory) useGLContext(f func()) {
 }
 
 func (t *textureFactory) createGameWindow(width, height, scale int, title string) *GameWindow {
-	return runGameWindow(t.graphicsDevice, width, height, scale, title, t.sharedContext)
+	w := newGameWindow(width, height, scale, title)
+	go func() {
+		t.gameWindows <- w
+	}()
+	return w
 }
 
 func (t *textureFactory) Events() <-chan interface{} {
@@ -72,6 +84,7 @@ func (t *textureFactory) Events() <-chan interface{} {
 
 func (t *textureFactory) CreateTexture(tag interface{}, img image.Image, filter graphics.Filter) {
 	go func() {
+		<-t.inited
 		var id graphics.TextureId
 		var err error
 		t.useGLContext(func() {
@@ -91,6 +104,7 @@ func (t *textureFactory) CreateTexture(tag interface{}, img image.Image, filter
 
 func (t *textureFactory) CreateRenderTarget(tag interface{}, width, height int) {
 	go func() {
+		<-t.inited
 		var id graphics.RenderTargetId
 		var err error
 		t.useGLContext(func() {

ui/cocoa/ui.go

@@ -25,10 +25,8 @@ func getCurrentUI() *cocoaUI {
 	}
 
 	currentUI = &cocoaUI{}
+	currentUI.textureFactory = newTextureFactory()
 
-	C.StartApplication()
-
-	currentUI.textureFactory = runTextureFactory()
 	return currentUI
 }
 
@@ -48,6 +46,10 @@ func (u *cocoaUI) PollEvents() {
 	C.PollEvents()
 }
 
-func (u *cocoaUI) MainLoop() {
+func (u *cocoaUI) RunMainLoop() {
-	C.Run()
+	C.StartApplication()
+	currentUI.textureFactory.run()
+
+	// TODO: Enable the loop
+	//C.Run()
 }

ui/ui.go

@@ -35,7 +35,7 @@ type WindowClosedEvent struct {
 type UI interface {
 	PollEvents()
 	CreateGameWindow(screenWidth, screenHeight, screenScale int, title string) GameWindow
-	MainLoop()
+	RunMainLoop()
 }
 
 type Window interface {