internal/cglfw: let functions return errors in native_darwin.go and glfw_unix.go

Updates #2703

internal/cglfw/error_unix.go

@@ -208,3 +208,18 @@ func fetchError() *Error {
 		return nil
 	}
 }
+
+// fetchErrorIgnoringPlatformError is fetchError igoring platformError.
+// This emulates panicError but without panicking.
+func fetchErrorIgnoringPlatformError() error {
+	select {
+	case err := <-lastError:
+		if err.Code == platformError {
+			fmt.Fprintln(os.Stderr, err)
+			return nil
+		}
+		return err
+	default:
+		return nil
+	}
+}

internal/cglfw/glfw_unix.go

@@ -123,9 +123,9 @@ func GetClipboardString() string {
 // string.
 //
 // This function may only be called from the main thread.
-func SetClipboardString(str string) {
+func SetClipboardString(str string) error {
 	cp := C.CString(str)
 	defer C.free(unsafe.Pointer(cp))
 	C.glfwSetClipboardString(nil, cp)
-	panicError()
+	return fetchErrorIgnoringPlatformError()
 }

internal/cglfw/native_darwin.go

@@ -23,22 +23,19 @@ import "C"
 import "unsafe"
 
 // GetCocoaMonitor returns the CGDirectDisplayID of the monitor.
-func (m *Monitor) GetCocoaMonitor() uintptr {
+func (m *Monitor) GetCocoaMonitor() (uintptr, error) {
 	ret := uintptr(C.glfwGetCocoaMonitor(m.data))
-	panicError()
+	return ret, fetchErrorIgnoringPlatformError()
-	return ret
 }
 
 // GetCocoaWindow returns the NSWindow of the window.
-func (w *Window) GetCocoaWindow() unsafe.Pointer {
+func (w *Window) GetCocoaWindow() (unsafe.Pointer, error) {
 	ret := C.workaround_glfwGetCocoaWindow(w.data)
-	panicError()
+	return ret, fetchErrorIgnoringPlatformError()
-	return ret
 }
 
 // GetNSGLContext returns the NSOpenGLContext of the window.
-func (w *Window) GetNSGLContext() unsafe.Pointer {
+func (w *Window) GetNSGLContext() (unsafe.Pointer, error) {
 	ret := C.workaround_glfwGetNSGLContext(w.data)
-	panicError()
+	return ret, fetchErrorIgnoringPlatformError()
-	return ret
 }

internal/glfw/native_darwin.go

@@ -14,10 +14,18 @@
 
 package glfw
 
-func (w *Window) GetCocoaWindow() uintptr {
+func (w *Window) GetCocoaWindow() (uintptr, error) {
-	return uintptr(w.w.GetCocoaWindow())
+	ptr, err := w.w.GetCocoaWindow()
+	if err != nil {
+		return 0, err
+	}
+	return uintptr(ptr), nil
 }
 
-func (m *Monitor) GetCocoaMonitor() uintptr {
+func (m *Monitor) GetCocoaMonitor() (uintptr, error) {
-	return m.m.GetCocoaMonitor()
+	ptr, err := m.m.GetCocoaMonitor()
+	if err != nil {
+		return 0, err
+	}
+	return uintptr(ptr), nil
 }

internal/ui/ui_glfw.go

@@ -628,7 +628,11 @@ func (u *userInterfaceImpl) isFullscreen() (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	return m != nil || u.isNativeFullscreen(), nil
+	n, err := u.isNativeFullscreen()
+	if err != nil {
+		return false, err
+	}
+	return m != nil || n, nil
 }
 
 func (u *userInterfaceImpl) IsFullscreen() bool {
@@ -1188,7 +1192,9 @@ func (u *userInterfaceImpl) initOnMainThread(options *RunOptions) error {
 		}
 	}
 
-	u.setWindowResizingModeForOS(u.windowResizingMode)
+	if err := u.setWindowResizingModeForOS(u.windowResizingMode); err != nil {
+		return err
+	}
 
 	if options.SkipTaskbar {
 		// Ignore the error.
@@ -1239,7 +1245,11 @@ func (u *userInterfaceImpl) outsideSize() (float64, float64, error) {
 	if err != nil {
 		return 0, 0, err
 	}
-	if f && !u.isNativeFullscreen() {
+	n, err := u.isNativeFullscreen()
+	if err != nil {
+		return 0, 0, err
+	}
+	if f && !n {
 		// On Linux, the window size is not reliable just after making the window
 		// fullscreened. Use the monitor size.
 		// On macOS's native fullscreen, the window's size returns a more precise size
@@ -1600,8 +1610,10 @@ func (u *userInterfaceImpl) updateWindowSizeLimits() error {
 		return err
 	}
 
-	// The window size limit affects the resizing mode, especially on macOS (#).
+	// The window size limit affects the resizing mode, especially on macOS (#2260).
-	u.setWindowResizingModeForOS(u.windowResizingMode)
+	if err := u.setWindowResizingModeForOS(u.windowResizingMode); err != nil {
+		return err
+	}
 
 	return nil
 }
@@ -1744,7 +1756,9 @@ func (u *userInterfaceImpl) setFullscreen(fullscreen bool) error {
 		}
 
 		if u.isNativeFullscreenAvailable() {
-			u.setNativeFullscreen(fullscreen)
+			if err := u.setNativeFullscreen(fullscreen); err != nil {
+				return err
+			}
 		} else {
 			m, err := u.currentMonitor()
 			if err != nil {
@@ -1759,7 +1773,9 @@ func (u *userInterfaceImpl) setFullscreen(fullscreen bool) error {
 				return err
 			}
 		}
-		u.adjustViewSizeAfterFullscreen()
+		if err := u.adjustViewSizeAfterFullscreen(); err != nil {
+			return err
+		}
 		return nil
 	}
 
@@ -1779,7 +1795,9 @@ func (u *userInterfaceImpl) setFullscreen(fullscreen bool) error {
 	ww := int(dipToGLFWPixel(float64(u.origWindowWidthInDIP), m))
 	wh := int(dipToGLFWPixel(float64(u.origWindowHeightInDIP), m))
 	if u.isNativeFullscreenAvailable() {
-		u.setNativeFullscreen(false)
+		if err := u.setNativeFullscreen(false); err != nil {
+			return err
+		}
 		// Adjust the window size later (after adjusting the position).
 	} else {
 		m, err := u.window.GetMonitor()
@@ -1932,7 +1950,11 @@ func (u *userInterfaceImpl) Window() Window {
 
 // maximizeWindow must be called from the main thread.
 func (u *userInterfaceImpl) maximizeWindow() error {
-	if u.isNativeFullscreen() {
+	n, err := u.isNativeFullscreen()
+	if err != nil {
+		return err
+	}
+	if n {
 		return nil
 	}
 
@@ -1969,7 +1991,11 @@ func (u *userInterfaceImpl) maximizeWindow() error {
 // iconifyWindow must be called from the main thread.
 func (u *userInterfaceImpl) iconifyWindow() error {
 	// Iconifying a native fullscreen window on macOS is forbidden.
-	if u.isNativeFullscreen() {
+	n, err := u.isNativeFullscreen()
+	if err != nil {
+		return err
+	}
+	if n {
 		return nil
 	}
 
@@ -2085,7 +2111,9 @@ func (u *userInterfaceImpl) setWindowResizingMode(mode WindowResizingMode) error
 	if err := u.window.SetAttrib(glfw.Resizable, v); err != nil {
 		return err
 	}
-	u.setWindowResizingModeForOS(mode)
+	if err := u.setWindowResizingModeForOS(mode); err != nil {
+		return err
+	}
 
 	return nil
 }
@@ -2132,7 +2160,11 @@ func (u *userInterfaceImpl) isWindowMaximized() (bool, error) {
 	if err != nil {
 		return false, err
 	}
-	return a == glfw.True && !u.isNativeFullscreen(), nil
+	n, err := u.isNativeFullscreen()
+	if err != nil {
+		return false, err
+	}
+	return a == glfw.True && !n, nil
 }
 
 func (u *userInterfaceImpl) origWindowPos() (int, int) {

internal/ui/ui_glfw_darwin.go

@@ -274,7 +274,11 @@ func initialMonitorByOS() (*Monitor, error) {
 }
 
 func monitorFromWindowByOS(w *glfw.Window) (*Monitor, error) {
-	window := cocoa.NSWindow{ID: objc.ID(w.GetCocoaWindow())}
+	cocoaWindow, err := w.GetCocoaWindow()
+	if err != nil {
+		return nil, err
+	}
+	window := cocoa.NSWindow{ID: objc.ID(cocoaWindow)}
 	pool := cocoa.NSAutoreleasePool_new()
 	screen := cocoa.NSScreen_mainScreen()
 	if window.ID != 0 && window.IsVisible() {
@@ -287,7 +291,11 @@ func monitorFromWindowByOS(w *glfw.Window) (*Monitor, error) {
 	aID := uintptr(screenID.UnsignedIntValue()) // CGDirectDisplayID
 	pool.Release()
 	for _, m := range theMonitors.append(nil) {
-		if m.m.GetCocoaMonitor() == aID {
+		cocoaMonitor, err := m.m.GetCocoaMonitor()
+		if err != nil {
+			return nil, err
+		}
+		if cocoaMonitor == aID {
 			return m, nil
 		}
 	}
@@ -295,11 +303,15 @@ func monitorFromWindowByOS(w *glfw.Window) (*Monitor, error) {
 }
 
 func (u *userInterfaceImpl) nativeWindow() (uintptr, error) {
-	return u.window.GetCocoaWindow(), nil
+	return u.window.GetCocoaWindow()
 }
 
-func (u *userInterfaceImpl) isNativeFullscreen() bool {
+func (u *userInterfaceImpl) isNativeFullscreen() (bool, error) {
-	return cocoa.NSWindow{ID: objc.ID(u.window.GetCocoaWindow())}.StyleMask()&cocoa.NSWindowStyleMaskFullScreen != 0
+	w, err := u.window.GetCocoaWindow()
+	if err != nil {
+		return false, err
+	}
+	return cocoa.NSWindow{ID: objc.ID(w)}.StyleMask()&cocoa.NSWindowStyleMaskFullScreen != 0, nil
 }
 
 func (u *userInterfaceImpl) isNativeFullscreenAvailable() bool {
@@ -308,12 +320,16 @@ func (u *userInterfaceImpl) isNativeFullscreenAvailable() bool {
 	return true
 }
 
-func (u *userInterfaceImpl) setNativeFullscreen(fullscreen bool) {
+func (u *userInterfaceImpl) setNativeFullscreen(fullscreen bool) error {
 	// Toggling fullscreen might ignore events like keyUp. Ensure that events are fired.
 	glfw.WaitEventsTimeout(0.1)
-	window := cocoa.NSWindow{ID: objc.ID(u.window.GetCocoaWindow())}
+	w, err := u.window.GetCocoaWindow()
+	if err != nil {
+		return err
+	}
+	window := cocoa.NSWindow{ID: objc.ID(w)}
 	if window.StyleMask()&cocoa.NSWindowStyleMaskFullScreen != 0 == fullscreen {
-		return
+		return nil
 	}
 	// Even though EbitengineWindowDelegate is used, this hack is still required.
 	// toggleFullscreen doesn't work when the window is not resizable.
@@ -329,16 +345,22 @@ func (u *userInterfaceImpl) setNativeFullscreen(fullscreen bool) {
 	if !origFullScreen {
 		window.Send(sel_setCollectionBehavior, cocoa.NSUInteger(cocoa.NSUInteger(origCollectionBehavior)))
 	}
+
+	return nil
 }
 
-func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() {
+func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() error {
 	if u.graphicsDriver.IsGL() {
-		return
+		return nil
 	}
 
-	window := cocoa.NSWindow{ID: objc.ID(u.window.GetCocoaWindow())}
+	w, err := u.window.GetCocoaWindow()
+	if err != nil {
+		return err
+	}
+	window := cocoa.NSWindow{ID: objc.ID(w)}
 	if window.StyleMask()&cocoa.NSWindowStyleMaskFullScreen == 0 {
-		return
+		return nil
 	}
 
 	// Reduce the view height (#1745).
@@ -347,7 +369,7 @@ func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() {
 	view := window.ContentView()
 	viewSize := view.Frame().Size
 	if windowSize.Width != viewSize.Width || windowSize.Height != viewSize.Height {
-		return
+		return nil
 	}
 	viewSize.Width--
 	view.SetFrameSize(viewSize)
@@ -355,6 +377,7 @@ func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() {
 	// NSColor.blackColor (0, 0, 0, 1) didn't work.
 	// Use the transparent color instead.
 	window.SetBackgroundColor(cocoa.NSColor_colorWithSRGBRedGreenBlueAlpha(0, 0, 0, 0))
+	return nil
 }
 
 func (u *userInterfaceImpl) isFullscreenAllowedFromUI(mode WindowResizingMode) bool {
@@ -370,7 +393,7 @@ func (u *userInterfaceImpl) isFullscreenAllowedFromUI(mode WindowResizingMode) b
 	return false
 }
 
-func (u *userInterfaceImpl) setWindowResizingModeForOS(mode WindowResizingMode) {
+func (u *userInterfaceImpl) setWindowResizingModeForOS(mode WindowResizingMode) error {
 	var collectionBehavior uint
 	if u.isFullscreenAllowedFromUI(mode) {
 		collectionBehavior |= cocoa.NSWindowCollectionBehaviorManaged
@@ -378,13 +401,22 @@ func (u *userInterfaceImpl) setWindowResizingModeForOS(mode WindowResizingMode)
 	} else {
 		collectionBehavior |= cocoa.NSWindowCollectionBehaviorFullScreenNone
 	}
-	objc.ID(u.window.GetCocoaWindow()).Send(sel_setCollectionBehavior, collectionBehavior)
+	w, err := u.window.GetCocoaWindow()
+	if err != nil {
+		return err
+	}
+	objc.ID(w).Send(sel_setCollectionBehavior, collectionBehavior)
+	return nil
 }
 
 func initializeWindowAfterCreation(w *glfw.Window) error {
 	// TODO: Register NSWindowWillEnterFullScreenNotification and so on.
 	// Enable resizing temporary before making the window fullscreen.
-	nswindow := objc.ID(w.GetCocoaWindow())
+	cocoaWindow, err := w.GetCocoaWindow()
+	if err != nil {
+		return err
+	}
+	nswindow := objc.ID(cocoaWindow)
 	delegate := objc.ID(class_EbitengineWindowDelegate).Send(sel_alloc).Send(sel_initWithOrigDelegate, nswindow.Send(sel_delegate))
 	nswindow.Send(sel_setDelegate, delegate)
 	return nil

internal/ui/ui_glfw_linbsd.go

@@ -154,22 +154,24 @@ func (u *userInterfaceImpl) nativeWindow() (uintptr, error) {
 	return 0, nil
 }
 
-func (u *userInterfaceImpl) isNativeFullscreen() bool {
+func (u *userInterfaceImpl) isNativeFullscreen() (bool, error) {
-	return false
+	return false, nil
 }
 
 func (u *userInterfaceImpl) isNativeFullscreenAvailable() bool {
 	return false
 }
 
-func (u *userInterfaceImpl) setNativeFullscreen(fullscreen bool) {
+func (u *userInterfaceImpl) setNativeFullscreen(fullscreen bool) error {
 	panic(fmt.Sprintf("ui: setNativeFullscreen is not implemented in this environment: %s", runtime.GOOS))
 }
 
-func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() {
+func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() error {
+	return nil
 }
 
-func (u *userInterfaceImpl) setWindowResizingModeForOS(mode WindowResizingMode) {
+func (u *userInterfaceImpl) setWindowResizingModeForOS(mode WindowResizingMode) error {
+	return nil
 }
 
 func initializeWindowAfterCreation(w *glfw.Window) error {

internal/ui/ui_glfw_windows.go

@@ -183,22 +183,24 @@ func (u *userInterfaceImpl) nativeWindow() (uintptr, error) {
 	return uintptr(w), err
 }
 
-func (u *userInterfaceImpl) isNativeFullscreen() bool {
+func (u *userInterfaceImpl) isNativeFullscreen() (bool, error) {
-	return false
+	return false, nil
 }
 
 func (u *userInterfaceImpl) isNativeFullscreenAvailable() bool {
 	return false
 }
 
-func (u *userInterfaceImpl) setNativeFullscreen(fullscreen bool) {
+func (u *userInterfaceImpl) setNativeFullscreen(fullscreen bool) error {
 	panic(fmt.Sprintf("ui: setNativeFullscreen is not implemented in this environment: %s", runtime.GOOS))
 }
 
-func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() {
+func (u *userInterfaceImpl) adjustViewSizeAfterFullscreen() error {
+	return nil
 }
 
-func (u *userInterfaceImpl) setWindowResizingModeForOS(mode WindowResizingMode) {
+func (u *userInterfaceImpl) setWindowResizingModeForOS(mode WindowResizingMode) error {
+	return nil
 }
 
 func initializeWindowAfterCreation(w *glfw.Window) error {