HostInterface: Add function to switch between sw/hw rendering

src/core/host_interface.h

@@ -104,8 +104,13 @@ protected:
   /// Returns the path of the game database cache file.
   std::string GetGameListDatabaseFileName() const;
 
+  /// Applies new settings, updating internal state as needed. apply_callback should call m_settings.Load() after
+  /// locking any required mutexes.
   void UpdateSettings(const std::function<void()>& apply_callback);
 
+  /// Quick switch between software and hardware rendering.
+  void ToggleSoftwareRendering();
+
   void RunFrame();
 
   /// Throttles the system, i.e. sleeps until it's time to execute the next frame.