Feat/ios modern vibration api

src/common/ios.h

@@ -43,9 +43,11 @@ namespace ios
 std::string getLoveInResources(bool &fused);
 
 /**
- * Causes devices with vibration support to vibrate for about 0.5 seconds.
+ * Causes devices with vibration support to vibrate for the specified duration.
+ * On iOS 13+, uses Core Haptics for precise duration control.
+ * On iOS < 13, falls back to legacy 0.5 seconds of vibration.
  **/
-void vibrate();
+void vibrate(double seconds);
 
 /**
  * Enable mix mode (e.g. with background music apps) and playback with a muted device.

src/common/ios.mm

@@ -30,6 +30,7 @@
 
 #import <AudioToolbox/AudioServices.h>
 #import <AVFoundation/AVFoundation.h>
+#import <CoreHaptics/CoreHaptics.h>
 
 #include "modules/audio/Audio.h"
 
@@ -364,10 +365,57 @@ - (void)applicationBecameActive:(NSNotification *)note
 	return path;
 }
 
-void vibrate()
+void vibrate(double seconds)
 {
 	@autoreleasepool
 	{
+		if (@available(iOS 13.0, *))
+		{
+			NSError *error = nil;
+			CHHapticEngine *engine = [[CHHapticEngine alloc]
+				initAndReturnError:&error];
+
+			if (engine != nil)
+			{
+				[engine startAndReturnError:nil];
+
+				NSDictionary *hapticDict = @{
+					CHHapticPatternKeyEvent: @[@{
+						CHHapticPatternKeyEventType:
+							CHHapticEventTypeHapticContinuous,
+						CHHapticPatternKeyTime: @0.0,
+						CHHapticPatternKeyEventDuration: @(seconds),
+						CHHapticPatternKeyEventParameters: @[
+							// Correlates to Android's default high intensity vibration.
+							@{
+								CHHapticPatternKeyParameterID:
+									CHHapticEventParameterIDHapticIntensity,
+								CHHapticPatternKeyParameterValue: @1.0
+							},
+							// Medium sharpness, 0.0 is dull rumble while 1.0 is crisp tap.
+							@{
+								CHHapticPatternKeyParameterID:
+									CHHapticEventParameterIDHapticSharpness,
+								CHHapticPatternKeyParameterValue: @0.5
+							}
+						]
+					}]
+				};
+
+				CHHapticPattern *pattern = [[CHHapticPattern alloc]
+					initWithDictionary:hapticDict error:nil];
+
+				if (pattern != nil)
+				{
+					id<CHHapticPatternPlayer> player =
+						[engine createPlayerWithPattern:pattern error:nil];
+					[player startAtTime:0 error:nil];
+					return;
+				}
+			}
+		}
+
+		// Fallback: iOS < 13 or Core Haptics unavailable.
 		AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
 	}
 }

src/modules/system/System.cpp

@@ -62,7 +62,7 @@ void System::vibrate(double seconds) const
 #ifdef LOVE_ANDROID
 	love::android::vibrate(seconds);
 #elif defined(LOVE_IOS)
-	love::ios::vibrate();
+	love::ios::vibrate(seconds);
 #else
 	LOVE_UNUSED(seconds);
 #endif