1 files changed, 63 insertions, 0 deletions
diff --git a/tier1/tier1.cpp b/tier1/tier1.cpp
new file mode 100644
index 0000000..d683b87
--- /dev/null
+++ b/tier1/tier1.cpp
@@ -0,0 +1,63 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: A higher level link library for general use in the game and tools.
+//
+//===========================================================================//
+
+#include <tier1/tier1.h>
+#include "tier0/dbg.h"
+#include "vstdlib/iprocessutils.h"
+#include "icvar.h"
+
+
+//-----------------------------------------------------------------------------
+// These tier1 libraries must be set by any users of this library.
+// They can be set by calling ConnectTier1Libraries or InitDefaultFileSystem.
+// It is hoped that setting this, and using this library will be the common mechanism for
+// allowing link libraries to access tier1 library interfaces
+//-----------------------------------------------------------------------------
+ICvar *cvar = 0;
+ICvar *g_pCVar = 0;
+IProcessUtils *g_pProcessUtils = 0;
+static bool s_bConnected = false;
+
+// for utlsortvector.h
+#ifndef _WIN32
+	void *g_pUtlSortVectorQSortContext = NULL;
+#endif
+
+
+//-----------------------------------------------------------------------------
+// Call this to connect to 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 )
+{
+	// Don't connect twice..
+	if ( s_bConnected )
+		return;
+
+	s_bConnected = true;
+
+	for ( int i = 0; i < nFactoryCount; ++i )
+	{
+		if ( !g_pCVar )
+		{
+			cvar = g_pCVar = ( ICvar * )pFactoryList[i]( CVAR_INTERFACE_VERSION, NULL );
+		}
+		if ( !g_pProcessUtils )
+		{
+			g_pProcessUtils = ( IProcessUtils * )pFactoryList[i]( PROCESS_UTILS_INTERFACE_VERSION, NULL );
+		}
+	}
+}
+
+void DisconnectTier1Libraries()
+{
+	if ( !s_bConnected )
+		return;
+
+	g_pCVar = cvar = 0;
+	g_pProcessUtils = NULL;
+	s_bConnected = false;
+}