SDL: Display internal FPS/VPS seperately

src/pse-sdl/sdl_interface.cpp

@@ -483,9 +483,12 @@ void SDLInterface::RenderMainMenuBar()
     ImGui::EndMenu();
   }
 
-  ImGui::SetCursorPosX(ImGui::GetIO().DisplaySize.x - 80.0f);
+  ImGui::SetCursorPosX(ImGui::GetIO().DisplaySize.x - 170.0f);
   ImGui::Text("FPS: %.2f", m_fps);
 
+  ImGui::SetCursorPosX(ImGui::GetIO().DisplaySize.x - 80.0f);
+  ImGui::Text("VPS: %.2f", m_vps);
+
   ImGui::EndMainMenuBar();
 }
 
@@ -581,12 +584,14 @@ void SDLInterface::Run()
 
     // update fps counter
     {
-      m_fps_counter++;
       const double time = m_fps_timer.GetTimeSeconds();
       if (time >= 0.25f)
       {
-        m_fps = static_cast<float>(m_fps_counter / time);
-        m_fps_counter = 0;
+        m_vps = static_cast<float>(static_cast<double>(m_system->GetFrameNumber() - m_last_frame_number) / time);
+        m_last_frame_number = m_system->GetFrameNumber();
+        m_fps = static_cast<float>(
+          static_cast<double>(m_system->GetInternalFrameNumber() - m_last_internal_frame_number) / time);
+        m_last_internal_frame_number = m_system->GetInternalFrameNumber();
         m_fps_timer.Reset();
       }
     }

src/pse-sdl/sdl_interface.h

@@ -78,7 +78,9 @@ private:
 
   std::shared_ptr<DigitalController> m_controller;
 
+  float m_vps = 0.0f;
   float m_fps = 0.0f;
-  u32 m_fps_counter = 0;
+  u32 m_last_frame_number = 0;
+  u32 m_last_internal_frame_number = 0;
   Timer m_fps_timer;
 };

src/pse/gpu.cpp

@@ -499,6 +499,7 @@ void GPU::WriteGP1(u32 value)
     {
       m_crtc_state.regs.display_address_start = param & CRTCState::Regs::DISPLAY_ADDRESS_START_MASK;
       Log_DebugPrintf("Display address start <- 0x%08X", m_crtc_state.regs.display_address_start);
+      m_system->IncrementInternalFrameNumber();
     }
     break;
 

src/pse/system.h

@@ -31,7 +31,9 @@ public:
   HostInterface* GetHostInterface() const { return m_host_interface; }
 
   u32 GetFrameNumber() const { return m_frame_number; }
+  u32 GetInternalFrameNumber() const { return m_internal_frame_number; }
   void IncrementFrameNumber() { m_frame_number++; }
+  void IncrementInternalFrameNumber() { m_internal_frame_number++; }
 
   bool Initialize();
   void Reset();
@@ -68,4 +70,5 @@ private:
   std::unique_ptr<Timers> m_timers;
   std::unique_ptr<SPU> m_spu;
   u32 m_frame_number = 1;
+  u32 m_internal_frame_number = 1;
 };