Added event handling to AKDevice

Summary: Just allowing to determine tracking states.

Reviewed By: enpe

Differential Revision: D67949270

fbshipit-source-id: 6824119c793c6d96491c83f2277a3d40bb328601

impl/ocean/devices/arkit/AKDevice.h

@@ -19,7 +19,7 @@
 
 #include <ARKit/ARKit.h>
 
-@interface AKTracker6DOFDelegate : NSObject<ARSessionDelegate>
+@interface AKTracker6DOFDelegate : NSObject<ARSessionDelegate, ARSessionObserver>
 @end
 
 namespace Ocean
@@ -192,6 +192,13 @@ class OCEAN_DEVICES_ARKIT_EXPORT AKDevice : virtual public Device
 		 */
 		bool parameter(const std::string& parameter, Value& value) override;
 
+		/**
+		 * Translates the value of an ARTrackingState to a readable string.
+		 * @param state The state to translate
+		 * @return The readable string
+		 */
+		static std::string translateTrackingState(const ARTrackingState& state);
+
 		/**
 		 * Translates the value of an ARGeoTrackingState to a readable string.
 		 * @param state The state to translate

impl/ocean/devices/arkit/AKDevice.mm

@@ -736,6 +736,28 @@ - (void)session:(ARSession *)session didRemoveAnchors:(NSArray<__kindof ARAnchor
 	}
 }
 
+- (void)session:(ARSession*)session cameraDidChangeTrackingState:(ARCamera*)camera
+{
+	Log::debug() << "ARKit camera tracking state changed: " << AKDevice::translateTrackingState(camera.trackingState);
+}
+
+- (void)sessionWasInterrupted:(ARSession*)session
+{
+	Log::warning() << "ARKit session was interrupted";
+}
+
+- (void)sessionInterruptionEnded:(ARSession*)session
+{
+	Log::debug() << "ARKit session interruption ended";
+}
+
+- (BOOL)sessionShouldAttemptRelocalization:(ARSession*)session
+{
+	Log::debug() << "ARKit session should attempt relocalization";
+
+	return YES;
+}
+
 + (ARVideoFormat*)determinePreferredVideoFormat:(NSArray<ARVideoFormat*>*)supportedVideoFormats withWidth:(unsigned int)preferredWidth withHeight:(unsigned int)preferredHeight withFps:(float)preferredFps withHDR:(int)preferredHDR
 {
 #ifdef OCEAN_DEBUG
@@ -1025,6 +1047,24 @@ + (ARVideoFormat*)determinePreferredVideoFormat:(NSArray<ARVideoFormat*>*)suppor
 	return true;
 }
 
+std::string AKDevice::translateTrackingState(const ARTrackingState& state)
+{
+	switch (state)
+	{
+		case ARTrackingStateNotAvailable:
+			return std::string("ARTrackingStateNotAvailable");
+
+		case ARTrackingStateLimited:
+			return std::string("ARTrackingStateLimited");
+
+		case ARTrackingStateNormal:
+			return std::string("ARTrackingStateNormal");
+	}
+
+	ocean_assert(false && "Unknown");
+	return std::string("Unknown");
+}
+
 API_AVAILABLE(ios(14.0))
 std::string AKDevice::translateGeoTrackingState(const ARGeoTrackingState& state)
 {