Added original SDK code for Alien Swarm.

game/server/inforemarkable.cpp

@@ -0,0 +1,76 @@
+//========= Copyright <20> 1996-2008, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Definition of the info_remarkable entity.
+//			This entity is a quick and dirty hack to provide writers 
+//			with some kind of object that characters can remark upon.
+//			It is not performant, because it relies upon each character
+//			polling over each of these for visibility.  A better approach
+//			will be an object that is notified by the engine when it is within
+//			a character's view.
+//
+// $NoKeywords: $
+//=============================================================================//
+
+
+#include "cbase.h"
+#include "inforemarkable.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+
+/// A global list of entities that can be remarked upon.
+/// @todo This is an awful, brute force solution. Fix it.
+class CRemarkableEntityList : public CAutoGameSystem
+{
+public:
+	CRemarkableEntityList( char const *name ) : CAutoGameSystem( name )
+	{}
+
+	virtual void LevelShutdownPostEntity()  
+	{ 
+		m_list.Purge();
+	}
+
+	void AddEntity( CInfoRemarkable *pItem )
+	{
+		m_list.AddToTail( pItem );
+	}
+
+	void RemoveEntity( CInfoRemarkable *pItem )
+	{
+		m_list.FindAndRemove( pItem );
+	}
+	CUtlLinkedList< CInfoRemarkable * > m_list;
+};
+
+CRemarkableEntityList g_RemarkableList( "CRemarkableEntityList" );
+
+
+CUtlLinkedList< CInfoRemarkable * > *CInfoRemarkable::GetListOfAllThatIsRemarkable( void )
+{
+	return &g_RemarkableList.m_list;
+}
+
+CInfoRemarkable::~CInfoRemarkable()
+{
+	g_RemarkableList.RemoveEntity( this );
+}
+
+void CInfoRemarkable::Spawn( void )
+{
+	g_RemarkableList.AddEntity(this);
+	m_iTimesRemarkedUpon = 0;
+}
+
+
+
+//--------------------------------------------------------------------------------------------------------
+LINK_ENTITY_TO_CLASS( info_remarkable, CInfoRemarkable );
+
+
+//--------------------------------------------------------------------------------------------------------
+BEGIN_DATADESC( CInfoRemarkable )
+DEFINE_KEYFIELD( m_szRemarkContext,	FIELD_STRING, "contextsubject" ),
+
+END_DATADESC()