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+/************************************************************************************
+
+Filename    :   Util_LatencyTest2Reader.h
+Content     :   Shared functionality for the DK2 latency tester
+Created     :   July 8, 2014
+Authors     :   Volga Aksoy, Chris Taylor
+
+Copyright   :   Copyright 2014 Oculus VR, Inc. All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License"); 
+you may not use the Oculus VR Rift SDK except in compliance with the License, 
+which is provided at the time of installation or download, or which 
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.1 
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+*************************************************************************************/
+
+#ifndef OVR_Util_LatencyTest2_State_h
+#define OVR_Util_LatencyTest2_State_h
+
+#include "../Kernel/OVR_Lockless.h"
+
+namespace OVR { namespace Util {
+
+
+enum LatencyTester2Constants
+{
+    LT2_ColorIncrement                  = 32,
+    LT2_PixelTestThreshold              = LT2_ColorIncrement / 3,
+    LT2_IncrementCount                  = 256 / LT2_ColorIncrement,
+    LT2_TimeoutWaitingForColorDetected  = 1000  // 1 second
+};
+
+
+//-------------------------------------------------------------------------------------
+// FrameTimeRecord
+
+// Describes frame scan-out time used for latency testing.
+struct FrameTimeRecord
+{
+    int    ReadbackIndex;
+    double TimeSeconds;
+
+    // Utility functions to convert color to readBack indices and back.
+    // The purpose of ReadbackIndex is to allow direct comparison by value.
+
+    static bool ColorToReadbackIndex(int *readbackIndex, unsigned char color);
+    static unsigned char ReadbackIndexToColor(int readbackIndex);
+};
+
+
+//-----------------------------------------------------------------------------
+// FrameTimeRecordSet
+
+// FrameTimeRecordSet is a container holding multiple consecutive frame timing records
+// returned from the lock-less state. Used by FrameTimeManager. 
+struct FrameTimeRecordSet
+{
+    enum {
+        RecordCount = 4,
+        RecordMask  = RecordCount - 1
+    };
+    FrameTimeRecord Records[RecordCount];    
+    int             NextWriteIndex;
+
+    FrameTimeRecordSet();
+
+    void AddValue(int readValue, double timeSeconds);
+    // Matching should be done starting from NextWrite index 
+    // until wrap-around
+
+    const FrameTimeRecord& operator [] (int i) const;
+
+    const FrameTimeRecord& GetMostRecentFrame();
+
+    // Advances I to  absolute color index
+    bool FindReadbackIndex(int* i, int readbackIndex) const;
+
+    bool IsAllZeroes() const;
+};
+
+typedef LocklessUpdater<FrameTimeRecordSet, FrameTimeRecordSet> LockessRecordUpdater;
+
+
+}} // namespace OVR::Util
+
+#endif // OVR_Util_LatencyTest2_State_h