VideoCommon/PerformanceMetrics: Display current offset between the latest frame presentation time and the intended presentation time in the "Show Frame Times" box.

2 files changed, 16 insertions, 0 deletions

diff --git a/Source/Core/VideoCommon/PerformanceMetrics.cpp b/Source/Core/VideoCommon/PerformanceMetrics.cpp
index 5a38e1e3c6..d00e5dbbba 100644
--- a/Source/Core/VideoCommon/PerformanceMetrics.cpp
+++ b/Source/Core/VideoCommon/PerformanceMetrics.cpp
@@ -23,6 +23,8 @@ void PerformanceMetrics::Reset()
 
   m_speed = 0;
   m_max_speed = 0;
+
+  m_frame_presentation_offset = DT{};
 }
 
 void PerformanceMetrics::CountFrame()
@@ -98,6 +100,11 @@ double PerformanceMetrics::GetMaxSpeed() const
   return m_max_speed.load(std::memory_order_relaxed);
 }
 
+void PerformanceMetrics::SetLatestFramePresentationOffset(DT offset)
+{
+  m_frame_presentation_offset.store(offset, std::memory_order_relaxed);
+}
+
 void PerformanceMetrics::DrawImGuiStats(const float backbuffer_scale)
 {
   m_vps_counter.UpdateStats();
@@ -293,6 +300,10 @@ void PerformanceMetrics::DrawImGuiStats(const float backbuffer_scale)
                            DT_ms(m_fps_counter.GetDtAvg()).count());
         ImGui::TextColored(ImVec4(r, g, b, 1.0f), " ±:%6.2lfms",
                            DT_ms(m_fps_counter.GetDtStd()).count());
+
+        const auto offset =
+            DT_ms(m_frame_presentation_offset.load(std::memory_order_relaxed)).count();
+        ImGui::TextColored(ImVec4(r, g, b, 1.0f), "ofs:%5.1lfms", offset);
       }
     }
     ImGui::End();
diff --git a/Source/Core/VideoCommon/PerformanceMetrics.h b/Source/Core/VideoCommon/PerformanceMetrics.h
index bca6372d18..914e6bc82f 100644
--- a/Source/Core/VideoCommon/PerformanceMetrics.h
+++ b/Source/Core/VideoCommon/PerformanceMetrics.h
@@ -43,6 +43,9 @@ public:
   double GetSpeed() const;
   double GetMaxSpeed() const;
 
+  // Call from any thread.
+  void SetLatestFramePresentationOffset(DT offset);
+
   // ImGui Functions
   void DrawImGuiStats(const float backbuffer_scale);
 
@@ -55,6 +58,8 @@ private:
   std::atomic<double> m_speed{};
   std::atomic<double> m_max_speed{};
 
+  std::atomic<DT> m_frame_presentation_offset{};
+
   struct PerfSample
   {
     TimePoint clock_time;