no engine anymore

tier1/interface.cpp

@@ -0,0 +1,29 @@
+#include "tier1/interface.h"
+#include "tier1/utlvector.h"
+
+CInterfaceRegistry *g_pInterfaceRegistries = NULL;
+CInterfaceRegistry::CInterfaceRegistry( InstantiateInterfaceFn fn, const char *szName )
+	: m_szName(szName)
+{
+	m_CreateFn = fn;
+	m_pNext = g_pInterfaceRegistries;
+	g_pInterfaceRegistries = this;
+};
+
+void *CreateInterface( const char *szName, int *pReturnCode )
+{
+	CInterfaceRegistry *pRegistry = g_pInterfaceRegistries;
+	while (pRegistry)
+	{
+		if (!V_strcmp(szName, pRegistry->m_szName))
+		{
+			if (pReturnCode)
+				*pReturnCode = 0;
+			return pRegistry->m_CreateFn();
+		}
+		pRegistry = pRegistry->m_pNext;
+	}
+	if (pReturnCode)
+		*pReturnCode = 1;
+	return 0;
+}