Adding ViroKit. Needs AWSCore :(

mobile/ios/ViroKit.framework/Headers/VROTransformDelegate.h

@@ -0,0 +1,52 @@
+//
+//  VROTransformDelegate
+//  ViroRenderer
+//
+//  Copyright © 2017 Viro Media. All rights reserved.
+//
+
+#ifndef VROTransformDelegate_h
+#define VROTransformDelegate_h
+
+#include <memory>
+#include <vector>
+#include "VROVector3f.h"
+#include "VROTime.h"
+
+/*
+  Delegate that is attached to a node for notifying the bridge regarding transformation updates.
+ */
+class VROTransformDelegate {
+public:
+    VROTransformDelegate(double distanceFilter) {
+        _distanceFilter = distanceFilter;
+    }
+    virtual ~VROTransformDelegate() {}
+    virtual void onPositionUpdate(VROVector3f position)=0;
+
+    /*
+     Called from a native vroNode that this delegate is attached to and in turn notifies the bridge
+     whenever a animation transaction occurs. Filtering is also performed to reduce the number of
+     calls across the renderer-to-javascript bridge.
+     */
+    void processPositionUpdate(VROVector3f position, bool force) {
+        double currentRenderTime = VROTimeCurrentMillis();
+        if (_lastSampleTimeMs + 16 >= currentRenderTime && !force) {
+            return;
+        }
+
+        if (_lastPositionUpdate.distance(position) < _distanceFilter && !force){
+            return;
+        }
+
+        _lastSampleTimeMs = currentRenderTime;
+        _lastPositionUpdate = position;
+        onPositionUpdate(position);
+    }
+
+private:
+    double _lastSampleTimeMs = 0;
+    double _distanceFilter;
+    VROVector3f _lastPositionUpdate;
+};
+#endif