internal/graphicsdriver/metal: refactoring

internal/graphicsdriver/metal/graphics_darwin.go

@@ -860,7 +860,6 @@ func (i *Image) mtlTexture() mtl.Texture {
 	if i.screen {
 		g := i.graphics
 		if g.screenDrawable == (ca.MetalDrawable{}) {
-			i.graphics.view.waitForDisplayLinkOutputCallback()
 			drawable := g.view.nextDrawable()
 			if drawable == (ca.MetalDrawable{}) {
 				return mtl.Texture{}

internal/graphicsdriver/metal/view_darwin.go

@@ -97,20 +97,11 @@ func (v *view) initialize(device mtl.Device, colorSpace graphicsdriver.ColorSpac
 
 	v.ml.SetMaximumDrawableCount(maximumDrawableCount)
 
-	v.initializeDisplayLink()
+	v.initializeOS()
 
 	return nil
 }
 
-func (v *view) nextDrawable() ca.MetalDrawable {
-	d, err := v.ml.NextDrawable()
-	if err != nil {
-		// Drawable is nil. This can happen at the initial state. Let's wait and see.
-		return ca.MetalDrawable{}
-	}
-	return d
-}
-
 type fence struct {
 	value     uint64
 	lastValue uint64

internal/graphicsdriver/metal/view_ios.go

@@ -39,6 +39,7 @@ import "C"
 import (
 	"unsafe"
 
+	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/ca"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
 )
 
@@ -65,10 +66,15 @@ const (
 	resourceStorageMode = mtl.ResourceStorageModeShared
 )
 
-func (v *view) initializeDisplayLink() {
+func (v *view) nextDrawable() ca.MetalDrawable {
-	// Do nothing.
+	d, err := v.ml.NextDrawable()
+	if err != nil {
+		// Drawable is nil. This can happen at the initial state. Let's wait and see.
+		return ca.MetalDrawable{}
+	}
+	return d
 }
 
-func (v *view) waitForDisplayLinkOutputCallback() {
+func (v *view) initializeOS() {
 	// Do nothing.
 }

internal/graphicsdriver/metal/view_macos.go

@@ -28,6 +28,7 @@ import (
 	"github.com/ebitengine/purego/objc"
 
 	"github.com/hajimehoshi/ebiten/v2/internal/cocoa"
+	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/ca"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
 )
 
@@ -61,7 +62,7 @@ const (
 	resourceStorageMode = mtl.ResourceStorageModeManaged
 )
 
-func (v *view) initializeDisplayLink() {
+func (v *view) initializeOS() {
 	v.fence = newFence()
 
 	// TODO: CVDisplayLink APIs are deprecated in macOS 10.15 and later.
@@ -97,3 +98,16 @@ func ebitengine_DisplayLinkOutputCallback(displayLinkRef C.CVDisplayLinkRef, inN
 	view.fence.advance()
 	return 0
 }
+
+func (v *view) nextDrawable() ca.MetalDrawable {
+	// TODO: Use CAMetalDisplayLink if available.
+
+	v.waitForDisplayLinkOutputCallback()
+
+	d, err := v.ml.NextDrawable()
+	if err != nil {
+		// Drawable is nil. This can happen at the initial state. Let's wait and see.
+		return ca.MetalDrawable{}
+	}
+	return d
+}