New FrameTime/VBlank Analyzer + Graph

Source/Core/VideoCommon/PerformanceMetrics.h

@@ -0,0 +1,40 @@
+// Copyright 2022 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "VideoCommon/PerformanceTracker.h"
+
+class PerformanceMetrics
+{
+public:
+  PerformanceMetrics() = default;
+  ~PerformanceMetrics() = default;
+
+  PerformanceMetrics(const PerformanceMetrics&) = delete;
+  PerformanceMetrics& operator=(const PerformanceMetrics&) = delete;
+  PerformanceMetrics(PerformanceMetrics&&) = delete;
+  PerformanceMetrics& operator=(PerformanceMetrics&&) = delete;
+
+public:  // Count Functions
+  void Reset();
+  void CountFrame();
+  void CountVBlank();
+
+public:  // Getter Functions
+  double GetFPS() const;
+  double GetVPS() const;
+  double GetSpeed() const;
+
+  double GetLastSpeedDenominator() const;
+
+public:  // ImGui Functions
+  void DrawImGuiStats(const float backbuffer_scale) const;
+
+private:  // Member Variables
+  PerformanceTracker m_fps_counter{"render_times.txt"};
+  PerformanceTracker m_vps_counter{"vblank_times.txt"};
+  PerformanceTracker m_speed_counter{nullptr, 6000000};
+};
+
+extern PerformanceMetrics g_perf_metrics;