1 files changed, 106 insertions, 0 deletions
diff --git a/public/tier1/tier1.h b/public/tier1/tier1.h
new file mode 100644
index 0000000..ac79067
--- /dev/null
+++ b/public/tier1/tier1.h
@@ -0,0 +1,106 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: A higher level link library for general use in the game and tools.
+//
+//===========================================================================//
+
+
+#ifndef TIER1_H
+#define TIER1_H
+
+#if defined( _WIN32 )
+#pragma once
+#endif
+
+#include "appframework/IAppSystem.h"
+#include "tier1/convar.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+class ICvar;
+class IProcessUtils;
+
+
+//-----------------------------------------------------------------------------
+// These tier1 libraries must be set by any users of this library.
+// They can be set by calling ConnectTier1Libraries.
+// It is hoped that setting this, and using this library will be the common mechanism for
+// allowing link libraries to access tier1 library interfaces
+//-----------------------------------------------------------------------------
+
+// These are marked DLL_EXPORT for Linux.
+DLL_EXPORT ICvar *cvar;
+extern ICvar *g_pCVar;
+extern IProcessUtils *g_pProcessUtils;
+
+
+//-----------------------------------------------------------------------------
+// Call this to connect to/disconnect from all tier 1 libraries.
+// It's up to the caller to check the globals it cares about to see if ones are missing
+//-----------------------------------------------------------------------------
+void ConnectTier1Libraries( CreateInterfaceFn *pFactoryList, int nFactoryCount );
+void DisconnectTier1Libraries();
+
+
+//-----------------------------------------------------------------------------
+// Helper empty implementation of an IAppSystem for tier2 libraries
+//-----------------------------------------------------------------------------
+template< class IInterface, int ConVarFlag = 0 > 
+class CTier1AppSystem : public CTier0AppSystem< IInterface >
+{
+	typedef CTier0AppSystem< IInterface > BaseClass;
+
+public:
+	CTier1AppSystem( bool bIsPrimaryAppSystem = true ) : BaseClass(	bIsPrimaryAppSystem )
+	{
+	}
+
+	virtual bool Connect( CreateInterfaceFn factory ) 
+	{
+		if ( !BaseClass::Connect( factory ) )
+			return false;
+
+		if ( BaseClass::IsPrimaryAppSystem() )
+		{
+			ConnectTier1Libraries( &factory, 1 );
+		}
+		return true;
+	}
+
+	virtual void Disconnect() 
+	{
+		if ( BaseClass::IsPrimaryAppSystem() )
+		{
+			DisconnectTier1Libraries();
+		}
+		BaseClass::Disconnect();
+	}
+
+	virtual InitReturnVal_t Init()
+	{
+		InitReturnVal_t nRetVal = BaseClass::Init();
+		if ( nRetVal != INIT_OK )
+			return nRetVal;
+
+		if ( g_pCVar && BaseClass::IsPrimaryAppSystem() )
+		{
+			ConVar_Register( ConVarFlag );
+		}
+		return INIT_OK;
+	}
+
+	virtual void Shutdown()
+	{
+		if ( g_pCVar && BaseClass::IsPrimaryAppSystem() )
+		{
+			ConVar_Unregister( );
+		}
+		BaseClass::Shutdown( );
+	}
+};
+
+
+#endif // TIER1_H
+