Save state support

src/pse/host_interface.h

@@ -1,16 +1,29 @@
 #pragma once
 #include "types.h"
+#include <memory>
 
 namespace GL {
 class Texture;
 }
 
+class System;
+
 class HostInterface
 {
 public:
+  HostInterface();
+  virtual ~HostInterface();
+
   virtual void SetDisplayTexture(GL::Texture* texture, u32 offset_x, u32 offset_y, u32 width, u32 height) = 0;
   virtual void ReportMessage(const char* message) = 0;
 
   // Adds OSD messages, duration is in seconds.
   virtual void AddOSDMessage(const char* message, float duration = 2.0f) = 0;
+
+protected:
+  bool LoadState(const char* filename);
+  bool SaveState(const char* filename);
+
+  std::unique_ptr<System> m_system;
+  bool m_running = false;
 };