Adding ViroKit. Needs AWSCore :(

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

@@ -0,0 +1,43 @@
+//
+//  VROARTransparentShadow.h
+//  ViroKit
+//
+//  Created by Raj Advani on 8/23/17.
+//  Copyright © 2017 Viro Media. All rights reserved.
+//
+
+#ifndef VROARTShadow_h
+#define VROARTShadow_h
+
+#include <memory>
+
+class VROMaterial;
+class VROShaderModifier;
+
+/*
+ Apply this to any material to turn it into a "transparent shadow"
+ material. These materials are transparent but able to receive shadows
+ from the shadow-mapping system.
+ 
+ They achieve this through a combination of shader modifiers that:
+ 
+ 1. Make the color of the surface black, with alpha 0,
+ 2. Increase the alpha if the surface is in shadow.
+ 
+ This is used to cast virtual shadows on real-world scenes.
+ */
+class VROARShadow {
+public:
+    
+    static void apply(std::shared_ptr<VROMaterial> material);
+    static void remove(std::shared_ptr<VROMaterial> material);
+    
+private:
+    
+    static std::shared_ptr<VROShaderModifier> createSurfaceModifier();
+    static std::shared_ptr<VROShaderModifier> createFragmentModifier();
+    static std::shared_ptr<VROShaderModifier> createLightingModifier();
+    
+};
+
+#endif /* VROARShadow_h */