internal/uidriver/mobile: Implement Vibrate on iOS

Updates #1452

internal/uidriver/mobile/gamepad_ios.go

@@ -417,7 +417,7 @@ package mobile
 //   }
 // }
 //
-// static void init(void) {
+// static void initializeGamepads(void) {
 //   controllers = [NSMutableArray array];
 //   controllerProperties = [NSMutableArray array];
 //
@@ -453,7 +453,7 @@ import (
 )
 
 func init() {
-	C.init()
+	C.initializeGamepads()
 }
 
 func (i *Input) updateGamepads() {

internal/uidriver/mobile/ui.go

@@ -22,7 +22,6 @@ import (
 	"runtime/debug"
 	"sync"
 	"sync/atomic"
-	"time"
 	"unicode"
 
 	"golang.org/x/mobile/app"
@@ -493,7 +492,3 @@ func (u *UserInterface) ScheduleFrame() {
 		u.renderRequester.RequestRenderIfNeeded()
 	}
 }
-
-func (u *UserInterface) Vibrate(duration time.Duration) {
-	// TODO: Implement this (#1452)
-}

internal/uidriver/mobile/vibrate_android.go

@@ -0,0 +1,23 @@
+// Copyright 2021 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.
+
+package mobile
+
+import (
+	"time"
+)
+
+func (u *UserInterface) Vibrate(duration time.Duration) {
+	// TODO: Implement this (#1452)
+}

internal/uidriver/mobile/vibrate_ios.go

@@ -0,0 +1,106 @@
+// Copyright 2021 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
+// +build ios
+
+package mobile
+
+// #cgo LDFLAGS: -framework CoreHaptics
+//
+// #import <CoreHaptics/CoreHaptics.h>
+//
+// static CHHapticEngine* engine;
+//
+// static void initializeVibrate(void) {
+//   if (!CHHapticEngine.capabilitiesForHardware.supportsHaptics) {
+//     return;
+//   }
+//
+//   NSError* error = nil;
+//   engine = [[CHHapticEngine alloc] initAndReturnError:&error];
+//   if (error) {
+//     return;
+//   }
+//
+//   [engine startAndReturnError:&error];
+//   if (error) {
+//     return;
+//   }
+// }
+//
+// static void vibrate(double duration) {
+//   if (!engine) {
+//     return;
+//   }
+//
+//   @autoreleasepool {
+//     NSDictionary* hapticDict = @{
+//       CHHapticPatternKeyPattern: @[
+//         @{
+//           CHHapticPatternKeyEvent: @{
+//             CHHapticPatternKeyEventType:CHHapticEventTypeHapticContinuous,
+//             CHHapticPatternKeyTime:@0.0,
+//             CHHapticPatternKeyEventDuration:[NSNumber numberWithDouble:duration],
+//             CHHapticPatternKeyEventParameters:@[
+//               @{
+//                 CHHapticPatternKeyParameterID: CHHapticEventParameterIDHapticIntensity,
+//                 CHHapticPatternKeyParameterValue: @1.0,
+//               },
+//             ],
+//           },
+//         },
+//       ],
+//     };
+//
+//     NSError* error = nil;
+//     CHHapticPattern* pattern = [[CHHapticPattern alloc] initWithDictionary:hapticDict
+//                                                                      error:&error];
+//     if (error) {
+//       return;
+//     }
+//
+//     id<CHHapticPatternPlayer> player = [engine createPlayerWithPattern:pattern
+//                                                                  error:&error];
+//     if (error) {
+//       return;
+//     }
+//
+//     [player startAtTime:0 error:&error];
+//     if (error) {
+//       NSLog(@"3, %@", [error localizedDescription]);
+//       return;
+//     }
+//   }
+// }
+//
+import "C"
+
+import (
+	"sync"
+	"time"
+)
+
+func init() {
+	C.initializeVibrate()
+}
+
+var vibrationM sync.Mutex
+
+func (u *UserInterface) Vibrate(duration time.Duration) {
+	vibrationM.Lock()
+	defer vibrationM.Unlock()
+
+	C.vibrate(C.double(float64(duration) / float64(time.Second)))
+}

vibrate.go

@@ -21,7 +21,6 @@ import (
 // Vibrate vibrates the device.
 //
 // Vibrate works on mobiles and browsers.
-// On browsers, StrongManitude and WeakMagnitude might be ignored.
 //
 // Vibrate is concurrent-safe.
 func Vibrate(duration time.Duration) {