Adding ViroKit. Needs AWSCore :(

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

@@ -0,0 +1,55 @@
+//
+//  VROPhysicsMotionState.h
+//  ViroRenderer
+//
+//  Copyright © 2017 Viro Media. All rights reserved.
+//
+
+#ifndef VROPhysicsMotionState_h
+#define VROPhysicsMotionState_h
+
+#include <btBulletDynamicsCommon.h>
+
+/*
+ VROPhysicsMotionState, when attached to a Bullet body, notifies or grabs
+ transformation updates to/from a weakly referenced VROPhysicsBody.
+ */
+class VROPhysicsMotionState : public btMotionState {
+public:
+    std::weak_ptr<VROPhysicsBody> _w_physicsBody;
+    VROPhysicsMotionState(std::shared_ptr<VROPhysicsBody> body, btTransform transformOffset) {
+        _w_physicsBody = body;
+        _physicsTransformOffset = transformOffset;
+    }
+
+    virtual ~VROPhysicsMotionState(){}
+
+    void getWorldTransform(btTransform& centerOfMassWorldTrans) const {
+        std::shared_ptr<VROPhysicsBody> body = _w_physicsBody.lock();
+        if (!body) {
+            return;
+        }
+
+        body->getWorldTransform(centerOfMassWorldTrans);
+    }
+
+    void setWorldTransform(const btTransform& centerOfMassWorldTrans) {
+        std::shared_ptr<VROPhysicsBody> body = _w_physicsBody.lock();
+        if (!body) {
+            return;
+        }
+
+        body->setWorldTransform(centerOfMassWorldTrans);
+    }
+
+    btTransform getPhysicsTransformOffset(){
+        return _physicsTransformOffset;
+    }
+
+private:
+    /*
+     The offset from Viro's geometric transform to Bullet's physicsBody transform (center of mass).
+     */
+    btTransform _physicsTransformOffset;
+};
+#endif