Merge pull request #2806 from FearlessTobi/port-4882

Port citra-emu/citra#4882: "Add frametime logging for tracking performance over time"

1 files changed, 20 insertions, 1 deletions

diff --git a/src/core/perf_stats.h b/src/core/perf_stats.h
index 222ac1a63..d9a64f072 100644
--- a/src/core/perf_stats.h
+++ b/src/core/perf_stats.h
@@ -4,7 +4,9 @@
 
 #pragma once
 
+#include <array>
 #include <chrono>
+#include <cstddef>
 #include <mutex>
 #include "common/common_types.h"
 
@@ -27,6 +29,10 @@ struct PerfStatsResults {
  */
 class PerfStats {
 public:
+    explicit PerfStats(u64 title_id);
+
+    ~PerfStats();
+
     using Clock = std::chrono::high_resolution_clock;
 
     void BeginSystemFrame();
@@ -36,13 +42,26 @@ 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.
      */
     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();