Frontend: Fix invalid FPS showing when reset

src/duckstation/sdl_interface.cpp

@@ -489,7 +489,7 @@ void SDLInterface::DrawMainMenuBar()
   if (ImGui::BeginMenu("System"))
   {
     if (ImGui::MenuItem("Reset"))
-      m_system->Reset();
+      DoReset();
 
     ImGui::Separator();
 
@@ -654,6 +654,16 @@ void SDLInterface::DrawOSDMessages()
   }
 }
 
+void SDLInterface::DoReset()
+{
+  m_system->Reset();
+  m_last_frame_number = 0;
+  m_last_internal_frame_number = 0;
+  m_last_global_tick_counter = 0;
+  m_fps_timer.Reset();
+  AddOSDMessage("System reset.");
+}
+
 void SDLInterface::DoLoadState(u32 index)
 {
   LoadState(GetSaveStateFilename(index));

src/duckstation/sdl_interface.h

@@ -51,6 +51,7 @@ private:
   // We only pass mouse input through if it's grabbed
   bool IsWindowFullscreen() const;
   void DrawImGui();
+  void DoReset();
   void DoLoadState(u32 index);
   void DoSaveState(u32 index);