ui: Add SetFullscreen / IsFullscreen (#267)

examples/windowsize/main.go

@@ -40,6 +40,7 @@ var (
 		ebiten.KeyLeft:  0,
 		ebiten.KeyRight: 0,
 		ebiten.KeyS:     0,
+		ebiten.KeyF:     0,
 	}
 )
 
@@ -53,8 +54,9 @@ func update(screen *ebiten.Image) error {
 	}
 	screenScale := ebiten.ScreenScale()
 	d := int(32 / screenScale)
-
 	screenWidth, screenHeight := screen.Size()
+	fullscreen := ebiten.IsFullscreen()
+
 	if keyStates[ebiten.KeyUp] == 1 {
 		screenHeight += d
 	}
@@ -83,8 +85,12 @@ func update(screen *ebiten.Image) error {
 			panic("not reach")
 		}
 	}
+	if keyStates[ebiten.KeyF] == 1 {
+		fullscreen = !fullscreen
+	}
 	ebiten.SetScreenSize(screenWidth, screenHeight)
 	ebiten.SetScreenScale(screenScale)
+	ebiten.SetFullscreen(fullscreen)
 
 	if ebiten.IsRunningSlowly() {
 		return nil
@@ -100,6 +106,7 @@ func update(screen *ebiten.Image) error {
 	x, y := ebiten.CursorPosition()
 	msg := fmt.Sprintf(`Press arrow keys to change the window size
 Press S key to change the window scale
+Press F key to change the fullscreen state
 Cursor: (%d, %d)
 FPS: %0.2f`, x, y, ebiten.CurrentFPS())
 	ebitenutil.DebugPrint(screen, msg)

internal/ui/ui_glfw.go

@@ -36,6 +36,7 @@ type userInterface struct {
 	scale       float64
 	deviceScale float64
 	glfwScale   float64
+	fullscreen  bool
 	funcs       chan func()
 	running     bool
 	sizeChanged bool
@@ -129,7 +130,7 @@ func SetScreenSize(width, height int) bool {
 	}
 	r := false
 	_ = u.runOnMainThread(func() error {
-		r = u.setScreenSize(width, height, u.scale)
+		r = u.setScreenSize(width, height, u.scale, u.fullscreen)
 		return nil
 	})
 	return r
@@ -142,7 +143,20 @@ func SetScreenScale(scale float64) bool {
 	}
 	r := false
 	_ = u.runOnMainThread(func() error {
-		r = u.setScreenSize(u.width, u.height, scale)
+		r = u.setScreenSize(u.width, u.height, scale, u.fullscreen)
+		return nil
+	})
+	return r
+}
+
+func SetFullscreen(fullscreen bool) bool {
+	u := currentUI
+	if !u.isRunning() {
+		panic("ui: Run is not called yet")
+	}
+	r := false
+	_ = u.runOnMainThread(func() error {
+		r = u.setScreenSize(u.width, u.height, u.scale, fullscreen)
 		return nil
 	})
 	return r
@@ -161,6 +175,19 @@ func ScreenScale() float64 {
 	return s
 }
 
+func IsFullscreen() bool {
+	u := currentUI
+	if !u.isRunning() {
+		return false
+	}
+	f := false
+	_ = u.runOnMainThread(func() error {
+		f = u.fullscreen
+		return nil
+	})
+	return f
+}
+
 func SetCursorVisibility(visible bool) {
 	// This can be called before Run: change the state asyncly.
 	go func() {
@@ -183,7 +210,7 @@ func Run(width, height int, scale float64, title string, g GraphicsContext) erro
 	if err := u.runOnMainThread(func() error {
 		m := glfw.GetPrimaryMonitor()
 		v := m.GetVideoMode()
-		if !u.setScreenSize(width, height, scale) {
+		if !u.setScreenSize(width, height, scale, false) {
 			return errors.New("ui: Fail to set the screen size")
 		}
 		u.window.SetTitle(title)
@@ -290,8 +317,8 @@ func (u *userInterface) swapBuffers() {
 	u.window.SwapBuffers()
 }
 
-func (u *userInterface) setScreenSize(width, height int, scale float64) bool {
-	if u.width == width && u.height == height && u.scale == scale {
+func (u *userInterface) setScreenSize(width, height int, scale float64, fullscreen bool) bool {
+	if u.width == width && u.height == height && u.scale == scale && u.fullscreen == fullscreen {
 		return false
 	}
 
@@ -314,16 +341,23 @@ func (u *userInterface) setScreenSize(width, height int, scale float64) bool {
 	// swap buffers here before SetSize is called.
 	u.swapBuffers()
 
-	ch := make(chan struct{})
+	u.fullscreen = fullscreen
+
 	window := u.window
+	m := glfw.GetPrimaryMonitor()
+	v := m.GetVideoMode()
+	if u.fullscreen {
+		window.SetMonitor(m, 0, 0, v.Width, v.Height, v.RefreshRate)
+	} else {
+		window.SetMonitor(nil, 0, 0, 16, 16, v.RefreshRate)
+		ch := make(chan struct{})
 		window.SetFramebufferSizeCallback(func(_ *glfw.Window, width, height int) {
 			window.SetFramebufferSizeCallback(nil)
 			close(ch)
 		})
 		w, h := u.glfwSize()
 		window.SetSize(w, h)
-
-event:
+	event:
 		for {
 			glfw.PollEvents()
 			select {
@@ -332,6 +366,8 @@ event:
 			default:
 			}
 		}
+	}
+	// TODO: Rename this variable?
 	u.sizeChanged = true
 	return true
 }

internal/ui/ui_js.go

@@ -56,6 +56,16 @@ func ScreenScale() float64 {
 	return currentUI.scale
 }
 
+func SetFullscreen(fullscreen bool) bool {
+	// TODO: Implement
+	return false
+}
+
+func IsFullscreen() bool {
+	// TODO: Implement
+	return false
+}
+
 func SetCursorVisibility(visibility bool) {
 	if visibility {
 		canvas.Get("style").Set("cursor", "auto")

internal/ui/ui_mobile.go

@@ -110,6 +110,16 @@ func SetCursorVisibility(visibility bool) {
 	// Do nothing
 }
 
+func SetFullscreen(fullscreen bool) bool {
+	// Do nothing
+	return false
+}
+
+func IsFullscreen() bool {
+	// Do nothing
+	return false
+}
+
 func (u *userInterface) actualScreenScale() float64 {
 	return u.scale * deviceScale()
 }

run.go

@@ -149,3 +149,11 @@ func ScreenScale() float64 {
 func SetCursorVisibility(visible bool) {
 	ui.SetCursorVisibility(visible)
 }
+
+func IsFullscreen() bool {
+	return ui.IsFullscreen()
+}
+
+func SetFullscreen(fullscreen bool) {
+	ui.SetFullscreen(fullscreen)
+}