Adding ViroKit. Needs AWSCore :(

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

@@ -0,0 +1,62 @@
+//
+//  VROPhysicsBodyDelegate.h
+//  ViroRenderer
+//
+//  Copyright © 2017 Viro Media. All rights reserved.
+//
+
+#ifndef VROPhysicsBodyDelegate_h
+#define VROPhysicsBodyDelegate_h
+#include "VROPhysicsBody.h"
+#include "VROTime.h"
+
+/*
+ VROPhysicsBodyDelegate contains all callbacks delegate events pertaining to
+ the VROPhysicsBody that it is attached to (like collisions).
+ */
+class VROPhysicsBodyDelegate {
+    /*
+     LastKnownCollidedObjects is used to filter out similar collision results
+     so that delegates are only notify with collided-enter events.
+     */
+    std::map<std::string, VROPhysicsBody::VROCollision> _lastKnownCollidedObjects;
+    std::map<std::string, VROPhysicsBody::VROCollision> _currentCollidedObjects;
+    double _lastSampledTime = 0;
+
+public:
+    VROPhysicsBodyDelegate(){}
+    virtual ~VROPhysicsBodyDelegate() {}
+
+    virtual void onCollided(std::string bodyBKey, VROPhysicsBody::VROCollision collision) = 0;
+
+    /*
+     Called by VROPhysicsWorld when an object has collided within the computeCollisions() pass.
+     Bullet however only provides continuous contact collision checks. Instead, we only want to
+     notify our delegates about collision-entered events with onCollided(). Thus, here we
+     iterate through all known latestCollidedObjects and compare it with the objects we have
+     last seen in _lastKnownCollidedObjects, and then only notify the delegates regarding
+     new collisions.
+     */
+    void onEngineCollisionUpdate(std::string currentObject, const std::map<std::string, VROPhysicsBody::VROCollision> &latestCollidedObjects) {
+        _currentCollidedObjects.insert(latestCollidedObjects.begin(), latestCollidedObjects.end());
+
+        // Sample at a rate of every 10 frames
+        double collidedTime = VROTimeCurrentMillis();
+        if (_lastSampledTime + 160 > collidedTime) {
+            return;
+        }
+
+        _lastSampledTime = collidedTime;
+        for (auto &it: _currentCollidedObjects) {
+            if (_lastKnownCollidedObjects.find(it.first) == _lastKnownCollidedObjects.end()) {
+                onCollided(it.first, it.second);
+            }
+        }
+        
+        _lastKnownCollidedObjects = _currentCollidedObjects;
+        _currentCollidedObjects.clear();
+    }
+};
+
+
+#endif /* VROPhysicsBodyDelegate_h */