internal/graphicsdriver/metal: Disable presentsWithTransaction on iOS

Closes #1799

internal/graphicsdriver/metal/view.go

@@ -70,9 +70,7 @@ func (v *view) setFullscreen(fullscreen bool) {
 }
 
 func (v *view) updatePresentsWithTransaction() {
-	// Disable presentsWithTransaction on the fullscreen mode (#1745).
+	pwt := v.usePresentsWithTransaction()
-
-	pwt := !v.vsyncDisabled && !v.fullscreen
 	v.ml.SetPresentsWithTransaction(pwt)
 
 	// When presentsWithTransaction is YES and triple buffering is enabled, nextDrawing returns immediately once every two times.

internal/graphicsdriver/metal/view_ios.go

@@ -57,6 +57,11 @@ func (v *view) update() {
 	C.setFrame(v.ml.Layer(), unsafe.Pointer(v.uiview))
 }
 
+func (v *view) usePresentsWithTransaction() bool {
+	// Do not use presentsWithTransaction on iOS (#1799).
+	return false
+}
+
 const (
 	storageMode         = mtl.StorageModeShared
 	resourceStorageMode = mtl.ResourceStorageModeShared

internal/graphicsdriver/metal/view_macos.go

@@ -43,6 +43,11 @@ func (v *view) update() {
 	v.windowChanged = false
 }
 
+func (v *view) usePresentsWithTransaction() bool {
+	// Disable presentsWithTransaction on the fullscreen mode (#1745).
+	return !v.vsyncDisabled && !v.fullscreen
+}
+
 const (
 	storageMode         = mtl.StorageModeManaged
 	resourceStorageMode = mtl.ResourceStorageModeManaged