GPU: More work on OpenGL renderer

src/pse/system.h

@@ -1,6 +1,8 @@
 #pragma once
 #include "types.h"
 
+class HostInterface;
+
 namespace CPU
 {
 class Core;
@@ -13,15 +15,18 @@ class GPU;
 class System
 {
 public:
-  System();
+  System(HostInterface* host_interface);
   ~System();
 
+  HostInterface* GetHostInterface() const { return m_host_interface; }
+
   bool Initialize();
   void Reset();
 
   void RunFrame();
 
 private:
+  HostInterface* m_host_interface;
   std::unique_ptr<CPU::Core> m_cpu;
   std::unique_ptr<Bus> m_bus;
   std::unique_ptr<DMA> m_dma;