Adding ViroKit. Needs AWSCore :(

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

@@ -0,0 +1,68 @@
+//
+//  VROConcurrentBuffer.h
+//  ViroRenderer
+//
+//  Created by Raj Advani on 2/3/16.
+//  Copyright © 2016 Viro Media. All rights reserved.
+//
+
+#ifndef VROConcurrentBuffer_h
+#define VROConcurrentBuffer_h
+
+#include "VRODefines.h"
+#if VRO_METAL
+
+#include <stdio.h>
+#include "VROEye.h"
+#include <Metal/Metal.h>
+#include <MetalKit/MetalKit.h>
+
+static const int kMaxBuffersInFlight = 3;
+
+/*
+ Wraps a Metal buffer that's used by both the GPU and the CPU.
+ The section of the buffer being used (written to by the CPU) changes
+ with each frame, so that the CPU and GPU never collide.
+ */
+class VROConcurrentBuffer {
+    
+public:
+    
+    VROConcurrentBuffer(int size, NSString *label, id <MTLDevice> device);
+    virtual ~VROConcurrentBuffer();
+    
+    /*
+     Get the underlying MTLBuffer.
+     */
+    id <MTLBuffer> getMTLBuffer(VROEyeType eye) {
+        return _buffer[(int)eye];
+    }
+    
+    void *getWritableContents(VROEyeType eye, int frame) {
+        return (void *) ((char *)[_buffer[(int)eye] contents] + getWriteOffset(frame));
+    }
+    
+    /*
+     Get the CPU write offset into the MTLBuffer, based on the current
+     frame.
+     */
+    int getWriteOffset(int frame) {
+        return _size * (frame % kMaxBuffersInFlight);
+    }
+    
+private:
+    
+    /*
+     The underlying Metal buffer for each eye.
+     */
+    id <MTLBuffer> _buffer[2];
+    
+    /*
+     The size of each section in the MTLBuffer.
+     */
+    int _size;
+    
+};
+
+#endif
+#endif /* VROConcurrentBuffer_h */