1 files changed, 167 insertions, 0 deletions
diff --git a/src/Ryujinx.HLE/PerformanceStatistics.cs b/src/Ryujinx.HLE/PerformanceStatistics.cs
new file mode 100644
index 00000000..95fc2abe
--- /dev/null
+++ b/src/Ryujinx.HLE/PerformanceStatistics.cs
@@ -0,0 +1,167 @@
+using Ryujinx.Common;
+using System.Timers;
+
+namespace Ryujinx.HLE
+{
+    public class PerformanceStatistics
+    {
+        private const int FrameTypeGame   = 0;
+        private const int PercentTypeFifo = 0;
+
+        private double[] _frameRate;
+        private double[] _accumulatedFrameTime;
+        private double[] _previousFrameTime;
+
+        private double[] _averagePercent;
+        private double[] _accumulatedActiveTime;
+        private double[] _percentLastEndTime;
+        private double[] _percentStartTime;
+
+        private long[]   _framesRendered;
+        private double[] _percentTime;
+
+        private object[] _frameLock;
+        private object[] _percentLock;
+
+        private double _ticksToSeconds;
+
+        private Timer _resetTimer;
+
+        public PerformanceStatistics()
+        {
+            _frameRate            = new double[1];
+            _accumulatedFrameTime = new double[1];
+            _previousFrameTime    = new double[1];
+
+            _averagePercent        = new double[1];
+            _accumulatedActiveTime = new double[1];
+            _percentLastEndTime    = new double[1];
+            _percentStartTime      = new double[1];
+
+            _framesRendered = new long[1];
+            _percentTime    = new double[1];
+
+            _frameLock   = new object[] { new object() };
+            _percentLock = new object[] { new object() };
+
+            _resetTimer = new Timer(750);
+
+            _resetTimer.Elapsed += ResetTimerElapsed;
+            _resetTimer.AutoReset = true;
+
+            _resetTimer.Start();
+
+            _ticksToSeconds = 1.0 / PerformanceCounter.TicksPerSecond;
+        }
+
+        private void ResetTimerElapsed(object sender, ElapsedEventArgs e)
+        {
+            CalculateFrameRate(FrameTypeGame);
+            CalculateAveragePercent(PercentTypeFifo);
+        }
+
+        private void CalculateFrameRate(int frameType)
+        {
+            double frameRate = 0;
+
+            lock (_frameLock[frameType])
+            {
+                if (_accumulatedFrameTime[frameType] > 0)
+                {
+                    frameRate = _framesRendered[frameType] / _accumulatedFrameTime[frameType];
+                }
+
+                _frameRate[frameType]            = frameRate;
+                _framesRendered[frameType]       = 0;
+                _accumulatedFrameTime[frameType] = 0;
+            }
+        }
+
+        private void CalculateAveragePercent(int percentType)
+        {
+            // If start time is non-zero, a percent reading is still being measured.
+            // If there aren't any readings, the default should be 100% if still being measured, or 0% if not.
+            double percent = (_percentStartTime[percentType] == 0) ? 0 : 100;
+
+            lock (_percentLock[percentType])
+            {
+                if (_percentTime[percentType] > 0)
+                {
+                    percent = (_accumulatedActiveTime[percentType] / _percentTime[percentType]) * 100;
+                }
+
+                _averagePercent[percentType]        = percent;
+                _percentTime[percentType]           = 0;
+                _accumulatedActiveTime[percentType] = 0;
+            }
+        }
+
+        public void RecordGameFrameTime()
+        {
+            RecordFrameTime(FrameTypeGame);
+        }
+
+        public void RecordFifoStart()
+        {
+            StartPercentTime(PercentTypeFifo);
+        }
+
+        public void RecordFifoEnd()
+        {
+            EndPercentTime(PercentTypeFifo);
+        }
+
+        private void StartPercentTime(int percentType)
+        {
+            double currentTime = PerformanceCounter.ElapsedTicks * _ticksToSeconds;
+
+            _percentStartTime[percentType] = currentTime;
+        }
+
+        private void EndPercentTime(int percentType)
+        {
+            double currentTime       = PerformanceCounter.ElapsedTicks * _ticksToSeconds;
+            double elapsedTime       = currentTime - _percentLastEndTime[percentType];
+            double elapsedActiveTime = currentTime - _percentStartTime[percentType];
+
+            lock (_percentLock[percentType])
+            {
+                _accumulatedActiveTime[percentType] += elapsedActiveTime;
+                _percentTime[percentType]           += elapsedTime;
+            }
+
+            _percentLastEndTime[percentType] = currentTime;
+            _percentStartTime[percentType]   = 0;
+        }
+
+        private void RecordFrameTime(int frameType)
+        {
+            double currentFrameTime = PerformanceCounter.ElapsedTicks * _ticksToSeconds;
+            double elapsedFrameTime = currentFrameTime - _previousFrameTime[frameType];
+
+            _previousFrameTime[frameType] = currentFrameTime;
+
+            lock (_frameLock[frameType])
+            {
+                _accumulatedFrameTime[frameType] += elapsedFrameTime;
+
+                _framesRendered[frameType]++;
+            }
+        }
+
+        public double GetGameFrameRate()
+        {
+            return _frameRate[FrameTypeGame];
+        }
+
+        public double GetFifoPercent()
+        {
+            return _averagePercent[PercentTypeFifo];
+        }
+
+        public double GetGameFrameTime()
+        {
+            return 1000 / _frameRate[FrameTypeGame];
+        }
+    }
+}
+\ No newline at end of file