added main menus, improved shading

public/interface.h

@@ -0,0 +1,34 @@
+#ifndef INTERFACE_H
+#define INTERFACE_H
+
+#include "tier0/platform.h"
+
+abstract_class IInterface 
+{
+public:
+	virtual void Init() = 0;
+	virtual void Frame() = 0;
+	virtual void Deinit() = 0;
+};
+
+typedef IInterface*( *InterfaceRegistryFn )( void );
+
+class CInterfaceRegistry
+{
+public:
+	CInterfaceRegistry( const char *szName, InterfaceRegistryFn pfn );
+};
+
+
+#define DECLARE_INTERFACE(iface, impl) \
+IInterface *__interface_alloc_##impl() \
+{ \
+	return new impl; \
+}; \
+CInterfaceRegistry __interface_##name##_registry(#iface, __interface_alloc_##impl); \
+I##iface *iface() { \
+	static I##iface *pInterface = (I##iface*)__interface_alloc_##impl(); \
+	return pInterface; \
+}
+
+#endif