Revert "internal/graphicsdriver/metal: bug fix: use 3 drawables for fullscreen"

This reverts commit 3c7bcf3035.

Reason: the window unexpectedly blinks when exiting from fullscreen

Updates #2880

internal/graphicsdriver/metal/view_darwin.go

@@ -22,16 +22,16 @@ import (
 )
 
 type view struct {
+	window uintptr
+	uiview uintptr
+
+	windowChanged bool
 	vsyncDisabled bool
 
 	device mtl.Device
 	ml     ca.MetalLayer
 
-	maximumDrawableCount int
-
 	once sync.Once
-
-	viewPlatform
 }
 
 func (v *view) setDrawableSize(width, height int) {
@@ -52,24 +52,14 @@ func (v *view) setDisplaySyncEnabled(enabled bool) {
 func (v *view) forceSetDisplaySyncEnabled(enabled bool) {
 	v.ml.SetDisplaySyncEnabled(enabled)
 	v.vsyncDisabled = !enabled
-	v.updateMaximumDrawableCount()
-}
 
-func (v *view) updateMaximumDrawableCount() {
+	if v.vsyncDisabled {
-	var count int
-	if v.vsyncDisabled || v.isFullscreen() {
 		// Apparently 2 makes FPS half. Use 3.
-		count = 3
+		v.ml.SetMaximumDrawableCount(3)
 	} else {
 		// Use 2 in a usual case not to cause rendering delays (#2822).
-		count = 2
+		v.ml.SetMaximumDrawableCount(2)
 	}
-
-	if v.maximumDrawableCount == count {
-		return
-	}
-	v.ml.SetMaximumDrawableCount(count)
-	v.maximumDrawableCount = count
 }
 
 func (v *view) colorPixelFormat() mtl.PixelFormat {

internal/graphicsdriver/metal/view_ios.go

@@ -42,10 +42,6 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
 )
 
-type viewPlatform struct {
-	uiview uintptr
-}
-
 func (v *view) setWindow(window uintptr) {
 	panic("metal: setWindow is not available on iOS")
 }
@@ -64,10 +60,6 @@ func (v *view) update() {
 	C.setFrame(v.ml.Layer(), unsafe.Pointer(v.uiview))
 }
 
-func (v *view) isFullscreen() bool {
-	return false
-}
-
 const (
 	storageMode         = mtl.StorageModeShared
 	resourceStorageMode = mtl.ResourceStorageModeShared

internal/graphicsdriver/metal/view_macos.go

@@ -23,15 +23,9 @@ import (
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
 )
 
-type viewPlatform struct {
-	window        cocoa.NSWindow
-	windowChanged bool
-	fullscreen    bool
-}
-
 func (v *view) setWindow(window uintptr) {
 	// NSView can be updated e.g., fullscreen-state is switched.
-	v.window = cocoa.NSWindow{ID: objc.ID(window)}
+	v.window = window
 	v.windowChanged = true
 }
 
@@ -40,22 +34,15 @@ func (v *view) setUIView(uiview uintptr) {
 }
 
 func (v *view) update() {
-	if v.windowChanged {
+	if !v.windowChanged {
+		return
+	}
+
 	// TODO: Should this be called on the main thread?
-		v.window.ContentView().SetLayer(uintptr(v.ml.Layer()))
+	cocoaWindow := cocoa.NSWindow{ID: objc.ID(v.window)}
-		v.window.ContentView().SetWantsLayer(true)
+	cocoaWindow.ContentView().SetLayer(uintptr(v.ml.Layer()))
+	cocoaWindow.ContentView().SetWantsLayer(true)
 	v.windowChanged = false
-	}
-
-	fullscreen := v.window.StyleMask()&cocoa.NSWindowStyleMaskFullScreen != 0
-	if v.fullscreen != fullscreen {
-		v.fullscreen = fullscreen
-		v.updateMaximumDrawableCount()
-	}
-}
-
-func (v *view) isFullscreen() bool {
-	return v.fullscreen
 }
 
 const (