cmd/ebitenmobile: support Metal for iOS simulators

cmd/ebitenmobile/gobind.go

@@ -80,15 +80,6 @@ func invokeOriginalGobind(lang string) (pkgName string, err error) {
 	return pkgs[0].Name, nil
 }
 
-func forceGL() bool {
-	for _, tag := range strings.Split(*tags, ",") {
-		if tag == "ebitengl" {
-			return true
-		}
-	}
-	return false
-}
-
 func run() error {
 	writeFile := func(filename string, content string) error {
 		if err := ioutil.WriteFile(filepath.Join(*outdir, filename), []byte(content), 0644); err != nil {
@@ -110,12 +101,6 @@ func run() error {
 			content = strings.ReplaceAll(content, "{{.PrefixUpper}}", prefixUpper)
 			content = strings.ReplaceAll(content, "{{.PrefixLower}}", prefixLower)
 			content = strings.ReplaceAll(content, "{{.JavaPkg}}", *javaPkg)
-
-			f := "0"
-			if forceGL() {
-				f = "1"
-			}
-			content = strings.ReplaceAll(content, "{{.ForceGL}}", f)
 			return content
 		}
 
@@ -158,12 +143,6 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
 
 #import <TargetConditionals.h>
 
-#if TARGET_IPHONE_SIMULATOR || {{.ForceGL}}
-#define EBITEN_METAL 0
-#else
-#define EBITEN_METAL 1
-#endif
-
 #import <stdint.h>
 #import <UIKit/UIKit.h>
 #import <GLKit/GLkit.h>
@@ -209,10 +188,7 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
     started_ = true;
   }
 
-#if EBITEN_METAL
-  [self.view addSubview: self.metalView];
-  EbitenmobileviewSetUIView((uintptr_t)(self.metalView));
-#else
+  if (EbitenmobileviewIsGL()) {
     self.glkView.delegate = (id<GLKViewDelegate>)(self);
     [self.view addSubview: self.glkView];
 
@@ -220,7 +196,10 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
     [self glkView].context = context;
 	
     [EAGLContext setCurrentContext:context];
-#endif
+  } else {
+    [self.view addSubview: self.metalView];
+    EbitenmobileviewSetUIView((uintptr_t)(self.metalView));
+  }
 
   displayLink_ = [CADisplayLink displayLinkWithTarget:self selector:@selector(drawFrame)];
   [displayLink_ addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
@@ -229,11 +208,11 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
 
 - (void)viewWillLayoutSubviews {
   CGRect viewRect = [[self view] frame];
-#if EBITEN_METAL
-  [[self metalView] setFrame:viewRect];
-#else
+  if (EbitenmobileviewIsGL()) {
     [[self glkView] setFrame:viewRect];
-#endif
+  } else {
+    [[self metalView] setFrame:viewRect];
+  }
 }
 
 - (void)viewDidLayoutSubviews {
@@ -255,11 +234,11 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
       return;
     }
 
-#if EBITEN_METAL
-    [self updateEbiten];
-#else
+    if (EbitenmobileviewIsGL()) {
       [[self glkView] setNeedsDisplay];
-#endif
+    } else {
+      [self updateEbiten];
+    }
 
     if (explicitRendering_) {
       [displayLink_ setPaused:YES];
@@ -293,15 +272,15 @@ const objcM = `// Code generated by ebitenmobile. DO NOT EDIT.
 
 - (void)updateTouches:(NSSet*)touches {
   for (UITouch* touch in touches) {
-#if EBITEN_METAL
-    if (touch.view != [self metalView]) {
-      continue;
-    }
-#else
+    if (EbitenmobileviewIsGL()) {
       if (touch.view != [self glkView]) {
         continue;
       }
-#endif
+    } else {
+      if (touch.view != [self metalView]) {
+        continue;
+      }
+    }
     CGPoint location = [touch locationInView:touch.view];
     EbitenmobileviewUpdateTouchesOnIOS(touch.phase, (uintptr_t)touch, location.x, location.y);
   }

internal/ui/graphics_ios.go

@@ -19,10 +19,13 @@ package ui
 
 import (
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
+	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal"
 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/opengl"
 )
 
 func graphicsDriver() graphicsdriver.Graphics {
-	// Metal might not be supported on emulators on Intel machines.
+	if g := metal.Get(); g != nil {
+		return g
+	}
 	return opengl.Get()
 }

internal/ui/graphics_ios_arm64.go

@@ -1,31 +0,0 @@
-// Copyright 2019 The Ebiten Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-//go:build ios && !ebitengl && !ebitencbackend
-// +build ios,!ebitengl,!ebitencbackend
-
-package ui
-
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
-	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal"
-)
-
-func graphicsDriver() graphicsdriver.Graphics {
-	g := metal.Get()
-	if g == nil {
-		panic("ui: Metal is not available on this iOS device")
-	}
-	return g
-}

internal/ui/ui_ios.go

@@ -1,4 +1,4 @@
-// Copyright 2019 The Ebiten Authors
+// Copyright 2022 The Ebiten Authors
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -12,15 +12,18 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build (darwin && ios && arm) || (darwin && ios && arm64)
-// +build darwin,ios,arm darwin,ios,arm64
+//go:build ios
+// +build ios
 
-package ebitenmobileview
+package ui
 
-import (
-	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal"
-)
-
-func SetUIView(uiview int64) {
-	metal.Get().SetUIView(uintptr(uiview))
+func SetUIView(uiview uintptr) {
+	// This function should be called only when the graphics library is Metal.
+	if g, ok := theUI.graphicsDriver.(interface{ SetUIView(uintptr) }); ok {
+		g.SetUIView(uiview)
+	}
+}
+
+func IsGL() bool {
+	return theUI.graphicsDriver.IsGL()
 }

mobile/ebitenmobileview/view_ios.go

@@ -12,15 +12,19 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build darwin && ios && !arm && !arm64
-// +build darwin,ios,!arm,!arm64
+//go:build ios
+// +build ios
 
 package ebitenmobileview
 
 import (
-	"runtime"
+	"github.com/hajimehoshi/ebiten/v2/internal/ui"
 )
 
 func SetUIView(uiview int64) {
-	panic("ebitenmobileview: SetUIView is not available on GOARCH=" + runtime.GOARCH)
+	ui.SetUIView(uintptr(uiview))
+}
+
+func IsGL() bool {
+	return ui.IsGL()
 }