Add frametime logging for tracking performance over time

Co-Authored-By: jroweboy <jroweboy@gmail.com>

src/core/perf_stats.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <array>
 #include <chrono>
 #include <mutex>
 #include "common/common_types.h"
@@ -27,6 +28,10 @@ struct PerfStatsResults {
  */
 class PerfStats {
 public:
+    explicit PerfStats(u64 title_id);
+
+    ~PerfStats();
+
     using Clock = std::chrono::high_resolution_clock;
 
     void BeginSystemFrame();
@@ -35,6 +40,11 @@ public:
 
     PerfStatsResults GetAndResetStats(std::chrono::microseconds current_system_time_us);
 
+    /**
+     * Returns the Arthimetic Mean of all frametime values stored in the performance history.
+     */
+    double GetMeanFrametime();
+
     /**
      * Gets the ratio between walltime and the emulated time of the previous system frame. This is
      * useful for scaling inputs or outputs moving between the two time domains.
@@ -42,7 +52,15 @@ public:
     double GetLastFrameTimeScale();
 
 private:
-    std::mutex object_mutex;
+    std::mutex object_mutex{};
+
+    /// Title ID for the game that is running. 0 if there is no game running yet
+    u64 title_id{0};
+    /// Current index for writing to the perf_history array
+    std::size_t current_index{0};
+    /// Stores an hour of historical frametime data useful for processing and tracking performance
+    /// regressions with code changes.
+    std::array<double, 216000> perf_history = {};
 
     /// Point when the cumulative counters were reset
     Clock::time_point reset_point = Clock::now();