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+/************************************************************************************
+
+Filename : Util_LatencyTest2Reader.cpp
+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.
+
+*************************************************************************************/
+
+#include "Util_LatencyTest2Reader.h"
+
+namespace OVR { namespace Util {
+
+
+//// FrameTimeRecord
+
+bool FrameTimeRecord::ColorToReadbackIndex(int *readbackIndex, unsigned char color)
+{
+ int compareColor = color - LT2_ColorIncrement/2;
+ int index = color / LT2_ColorIncrement; // Use color without subtraction due to rounding.
+ int delta = compareColor - index * LT2_ColorIncrement;
+
+ if ((delta < LT2_PixelTestThreshold) && (delta > -LT2_PixelTestThreshold))
+ {
+ *readbackIndex = index;
+ return true;
+ }
+ return false;
+}
+
+unsigned char FrameTimeRecord::ReadbackIndexToColor(int readbackIndex)
+{
+ OVR_ASSERT(readbackIndex < LT2_IncrementCount);
+ return (unsigned char)(readbackIndex * LT2_ColorIncrement + LT2_ColorIncrement/2);
+}
+
+
+//// FrameTimeRecordSet
+
+FrameTimeRecordSet::FrameTimeRecordSet()
+{
+ NextWriteIndex = 0;
+ memset(this, 0, sizeof(FrameTimeRecordSet));
+}
+
+void FrameTimeRecordSet::AddValue(int readValue, double timeSeconds)
+{
+ Records[NextWriteIndex].ReadbackIndex = readValue;
+ Records[NextWriteIndex].TimeSeconds = timeSeconds;
+ NextWriteIndex++;
+ if (NextWriteIndex == RecordCount)
+ NextWriteIndex = 0;
+}
+// Matching should be done starting from NextWrite index
+// until wrap-around
+
+const FrameTimeRecord& FrameTimeRecordSet::operator [] (int i) const
+{
+ return Records[(NextWriteIndex + i) & RecordMask];
+}
+
+const FrameTimeRecord& FrameTimeRecordSet::GetMostRecentFrame()
+{
+ return Records[(NextWriteIndex - 1) & RecordMask];
+}
+
+// Advances I to absolute color index
+bool FrameTimeRecordSet::FindReadbackIndex(int* i, int readbackIndex) const
+{
+ for (; *i < RecordCount; (*i)++)
+ {
+ if ((*this)[*i].ReadbackIndex == readbackIndex)
+ return true;
+ }
+ return false;
+}
+
+bool FrameTimeRecordSet::IsAllZeroes() const
+{
+ for (int i = 0; i < RecordCount; i++)
+ if (Records[i].ReadbackIndex != 0)
+ return false;
+ return true;
+}
+
+
+//// RecordStateReader
+
+void RecordStateReader::GetRecordSet(FrameTimeRecordSet& recordset)
+{
+ if(!Updater)
+ {
+ return;
+ }
+
+ recordset = Updater->SharedLatencyTestState.GetState();
+ return;
+}
+
+
+}} // namespace OVR::Util