all: use atomic.Bool instead of atomic.Store/LoadUint32

Updates #2422

gameforui.go

@@ -25,18 +25,10 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/ui"
 )
 
-var screenFilterEnabled = int32(1)
+var screenFilterEnabled atomic.Bool
 
-func isScreenFilterEnabled() bool {
+func init() {
-	return atomic.LoadInt32(&screenFilterEnabled) != 0
+	screenFilterEnabled.Store(true)
-}
-
-func setScreenFilterEnabled(enabled bool) {
-	v := int32(0)
-	if enabled {
-		v = 1
-	}
-	atomic.StoreInt32(&screenFilterEnabled, v)
 }
 
 type gameForUI struct {
@@ -145,7 +137,7 @@ func (g *gameForUI) DrawFinalScreen(scale, offsetX, offsetY float64) {
 	}
 
 	switch {
-	case !isScreenFilterEnabled(), math.Floor(scale) == scale:
+	case !screenFilterEnabled.Load(), math.Floor(scale) == scale:
 		op := &DrawImageOptions{}
 		op.GeoM = geoM
 		g.screen.DrawImage(g.offscreen, op)

internal/gamepad/gamepad_desktop_windows.go

@@ -113,7 +113,7 @@ type nativeGamepadsDesktop struct {
 	enumObjectsCallback uintptr
 
 	nativeWindow  windows.HWND
-	deviceChanged int32
+	deviceChanged atomic.Bool
 	err           error
 }
 
@@ -537,11 +537,11 @@ func (g *nativeGamepadsDesktop) update(gamepads *gamepads) error {
 		g.origWndProc = h
 	}
 
-	if atomic.LoadInt32(&g.deviceChanged) != 0 {
+	if g.deviceChanged.Load() {
 		if err := g.detectConnection(gamepads); err != nil {
 			g.err = err
 		}
-		atomic.StoreInt32(&g.deviceChanged, 0)
+		g.deviceChanged.Store(false)
 	}
 
 	return nil
@@ -550,7 +550,7 @@ func (g *nativeGamepadsDesktop) update(gamepads *gamepads) error {
 func (g *nativeGamepadsDesktop) wndProc(hWnd uintptr, uMsg uint32, wParam, lParam uintptr) uintptr {
 	switch uMsg {
 	case _WM_DEVICECHANGE:
-		atomic.StoreInt32(&g.deviceChanged, 1)
+		g.deviceChanged.Store(true)
 	}
 	return _CallWindowProcW(g.origWndProc, hWnd, uMsg, wParam, lParam)
 }

internal/graphicscommand/commandqueue.go

@@ -43,14 +43,14 @@ const (
 	maxVertexFloatCount = MaxVertexCount * graphics.VertexFloatCount
 )
 
-var vsyncEnabled int32 = 1
+var vsyncEnabled atomic.Bool
+
+func init() {
+	vsyncEnabled.Store(true)
+}
 
 func SetVsyncEnabled(enabled bool, graphicsDriver graphicsdriver.Graphics) {
-	if enabled {
+	vsyncEnabled.Store(enabled)
-		atomic.StoreInt32(&vsyncEnabled, 1)
-	} else {
-		atomic.StoreInt32(&vsyncEnabled, 0)
-	}
 
 	runOnRenderThread(func() {
 		graphicsDriver.SetVsyncEnabled(enabled)
@@ -185,7 +185,7 @@ func (q *commandQueue) Flush(graphicsDriver graphicsdriver.Graphics, endFrame bo
 
 	var sync bool
 	// Disable asynchronous rendering when vsync is on, as this causes a rendering delay (#2822).
-	if endFrame && atomic.LoadInt32(&vsyncEnabled) != 0 {
+	if endFrame && vsyncEnabled.Load() {
 		sync = true
 	}
 	if !sync {

internal/ui/monitor_glfw.go

@@ -65,13 +65,13 @@ type monitors struct {
 
 	m sync.Mutex
 
-	updateCalled int32
+	updateCalled atomic.Bool
 }
 
 var theMonitors monitors
 
 func (m *monitors) append(ms []*Monitor) []*Monitor {
-	if atomic.LoadInt32(&m.updateCalled) == 0 {
+	if !m.updateCalled.Load() {
 		panic("ui: (*monitors).update must be called before (*monitors).append is called")
 	}
 
@@ -82,7 +82,7 @@ func (m *monitors) append(ms []*Monitor) []*Monitor {
 }
 
 func (m *monitors) primaryMonitor() *Monitor {
-	if atomic.LoadInt32(&m.updateCalled) == 0 {
+	if !m.updateCalled.Load() {
 		panic("ui: (*monitors).update must be called before (*monitors).primaryMonitor is called")
 	}
 
@@ -179,6 +179,6 @@ func (m *monitors) update() error {
 	m.monitors = newMonitors
 	m.m.Unlock()
 
-	atomic.StoreInt32(&m.updateCalled, 1)
+	m.updateCalled.Store(true)
 	return nil
 }

internal/ui/ui.go

@@ -75,10 +75,10 @@ type UserInterface struct {
 	err  error
 	errM sync.Mutex
 
-	isScreenClearedEveryFrame int32
+	isScreenClearedEveryFrame atomic.Bool
 	graphicsLibrary           int32
-	running                   int32
+	running                   atomic.Bool
-	terminated                int32
+	terminated                atomic.Bool
 
 	whiteImage *Image
 
@@ -107,9 +107,9 @@ func Get() *UserInterface {
 // newUserInterface must be called from the main thread.
 func newUserInterface() (*UserInterface, error) {
 	u := &UserInterface{
-		isScreenClearedEveryFrame: 1,
 		graphicsLibrary: int32(GraphicsLibraryUnknown),
 	}
+	u.isScreenClearedEveryFrame.Store(true)
 
 	u.whiteImage = u.NewImage(3, 3, atlas.ImageTypeRegular)
 	pix := make([]byte, 4*u.whiteImage.width*u.whiteImage.height)
@@ -196,15 +196,11 @@ func (u *UserInterface) setError(err error) {
 }
 
 func (u *UserInterface) IsScreenClearedEveryFrame() bool {
-	return atomic.LoadInt32(&u.isScreenClearedEveryFrame) != 0
+	return u.isScreenClearedEveryFrame.Load()
 }
 
 func (u *UserInterface) SetScreenClearedEveryFrame(cleared bool) {
-	v := int32(0)
+	u.isScreenClearedEveryFrame.Store(cleared)
-	if cleared {
-		v = 1
-	}
-	atomic.StoreInt32(&u.isScreenClearedEveryFrame, v)
 }
 
 func (u *UserInterface) setGraphicsLibrary(library GraphicsLibrary) {
@@ -216,21 +212,17 @@ func (u *UserInterface) GraphicsLibrary() GraphicsLibrary {
 }
 
 func (u *UserInterface) isRunning() bool {
-	return atomic.LoadInt32(&u.running) != 0 && !u.isTerminated()
+	return u.running.Load() && !u.isTerminated()
 }
 
 func (u *UserInterface) setRunning(running bool) {
-	if running {
+	u.running.Store(running)
-		atomic.StoreInt32(&u.running, 1)
-	} else {
-		atomic.StoreInt32(&u.running, 0)
-	}
 }
 
 func (u *UserInterface) isTerminated() bool {
-	return atomic.LoadInt32(&u.terminated) != 0
+	return u.terminated.Load()
 }
 
 func (u *UserInterface) setTerminated() {
-	atomic.StoreInt32(&u.terminated, 1)
+	u.terminated.Store(true)
 }

internal/ui/ui_mobile.go

@@ -40,7 +40,6 @@ var (
 
 func (u *UserInterface) init() error {
 	u.userInterfaceImpl = userInterfaceImpl{
-		foreground:            1,
 		graphicsLibraryInitCh: make(chan struct{}),
 		errCh:                 make(chan error),
 
@@ -48,6 +47,7 @@ func (u *UserInterface) init() error {
 		outsideWidth:  640,
 		outsideHeight: 480,
 	}
+	u.foreground.Store(true)
 	return nil
 }
 
@@ -89,7 +89,7 @@ type userInterfaceImpl struct {
 	outsideWidth  float64
 	outsideHeight float64
 
-	foreground int32
+	foreground atomic.Bool
 	errCh      chan error
 
 	context *context
@@ -104,11 +104,7 @@ type userInterfaceImpl struct {
 }
 
 func (u *UserInterface) SetForeground(foreground bool) error {
-	var v int32
+	u.foreground.Store(foreground)
-	if foreground {
-		v = 1
-	}
-	atomic.StoreInt32(&u.foreground, v)
 
 	if foreground {
 		return hook.ResumeAudio()
@@ -220,7 +216,7 @@ func (u *UserInterface) SetFullscreen(fullscreen bool) {
 }
 
 func (u *UserInterface) IsFocused() bool {
-	return atomic.LoadInt32(&u.foreground) != 0
+	return u.foreground.Load()
 }
 
 func (u *UserInterface) IsRunnableOnUnfocused() bool {

run.go

@@ -149,7 +149,7 @@ func CurrentFPS() float64 {
 }
 
 var (
-	isRunGameEnded_ = int32(0)
+	isRunGameEnded_ atomic.Bool
 )
 
 // SetScreenClearedEveryFrame enables or disables the clearing of the screen at the beginning of each frame.
@@ -179,7 +179,7 @@ func IsScreenClearedEveryFrame() bool {
 //
 // Deprecated: as of v2.5. Use FinalScreenDrawer instead.
 func SetScreenFilterEnabled(enabled bool) {
-	setScreenFilterEnabled(enabled)
+	screenFilterEnabled.Store(enabled)
 }
 
 // IsScreenFilterEnabled returns true if Ebitengine's "screen" filter is enabled.
@@ -188,7 +188,7 @@ func SetScreenFilterEnabled(enabled bool) {
 //
 // Deprecated: as of v2.5.
 func IsScreenFilterEnabled() bool {
-	return isScreenFilterEnabled()
+	return screenFilterEnabled.Load()
 }
 
 // Termination is a special error which indicates Game termination without error.
@@ -309,17 +309,13 @@ type RunGameOptions struct {
 //
 // Don't call RunGame or RunGameWithOptions twice or more in one process.
 func RunGameWithOptions(game Game, options *RunGameOptions) error {
-	defer atomic.StoreInt32(&isRunGameEnded_, 1)
+	defer isRunGameEnded_.Store(true)
 
 	initializeWindowPositionIfNeeded(WindowSize())
 
 	op := toUIRunOptions(options)
 	// This is necessary to change the result of IsScreenTransparent.
-	if op.ScreenTransparent {
+	screenTransparent.Store(op.ScreenTransparent)
-		atomic.StoreInt32(&screenTransparent, 1)
-	} else {
-		atomic.StoreInt32(&screenTransparent, 0)
-	}
 	g := newGameForUI(game, op.ScreenTransparent)
 
 	if err := ui.Get().Run(g, op); err != nil {
@@ -333,7 +329,7 @@ func RunGameWithOptions(game Game, options *RunGameOptions) error {
 }
 
 func isRunGameEnded() bool {
-	return atomic.LoadInt32(&isRunGameEnded_) != 0
+	return isRunGameEnded_.Load()
 }
 
 // ScreenSizeInFullscreen returns the size in device-independent pixels when the game is fullscreen.
@@ -640,7 +636,7 @@ func IsScreenTransparent() bool {
 	if !ui.IsScreenTransparentAvailable() {
 		return false
 	}
-	return atomic.LoadInt32(&screenTransparent) != 0
+	return screenTransparent.Load()
 }
 
 // SetScreenTransparent sets the state if the window is transparent.
@@ -653,14 +649,10 @@ func IsScreenTransparent() bool {
 //
 // Deprecated: as of v2.5. Use RunGameWithOptions instead.
 func SetScreenTransparent(transparent bool) {
-	if transparent {
+	screenTransparent.Store(transparent)
-		atomic.StoreInt32(&screenTransparent, 1)
-	} else {
-		atomic.StoreInt32(&screenTransparent, 0)
-	}
 }
 
-var screenTransparent int32 = 0
+var screenTransparent atomic.Bool
 
 // SetInitFocused sets whether the application is focused on show.
 // The default value is true, i.e., the application is focused.
@@ -673,14 +665,10 @@ var screenTransparent int32 = 0
 //
 // Deprecated: as of v2.5. Use RunGameWithOptions instead.
 func SetInitFocused(focused bool) {
-	if focused {
+	initUnfocused.Store(!focused)
-		atomic.StoreInt32(&initUnfocused, 0)
-	} else {
-		atomic.StoreInt32(&initUnfocused, 1)
-	}
 }
 
-var initUnfocused int32 = 0
+var initUnfocused atomic.Bool
 
 func toUIRunOptions(options *RunGameOptions) *ui.RunOptions {
 	const (
@@ -690,8 +678,8 @@ func toUIRunOptions(options *RunGameOptions) *ui.RunOptions {
 
 	if options == nil {
 		return &ui.RunOptions{
-			InitUnfocused:     atomic.LoadInt32(&initUnfocused) != 0,
+			InitUnfocused:     initUnfocused.Load(),
-			ScreenTransparent: atomic.LoadInt32(&screenTransparent) != 0,
+			ScreenTransparent: screenTransparent.Load(),
 			X11ClassName:      defaultX11ClassName,
 			X11InstanceName:   defaultX11InstanceName,
 		}

window.go

@@ -155,16 +155,16 @@ func WindowPosition() (x, y int) {
 //
 // SetWindowPosition is concurrent-safe.
 func SetWindowPosition(x, y int) {
-	atomic.StoreUint32(&windowPositionSetExplicitly, 1)
+	windowPositionSetExplicitly.Store(true)
 	ui.Get().Window().SetPosition(x, y)
 }
 
 var (
-	windowPositionSetExplicitly uint32
+	windowPositionSetExplicitly atomic.Bool
 )
 
 func initializeWindowPositionIfNeeded(width, height int) {
-	if atomic.LoadUint32(&windowPositionSetExplicitly) == 0 {
+	if !windowPositionSetExplicitly.Load() {
 		sw, sh := ui.Get().Monitor().Size()
 		x, y := ui.InitialWindowPosition(sw, sh, width, height)
 		ui.Get().Window().SetPosition(x, y)