upload "kind" alien swarm

game/server/cvisibilitymonitor.h

@@ -0,0 +1,25 @@
+//========= Copyright © 1996-2008, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: System to generate events as specified entities become visible to players.
+//
+// $NoKeywords: $
+//=====================================================================================//
+
+#include "cbase.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// A callback which will automatically be used instead of generating the generic
+// 'on_entity_visible' game event. Often used so that the entity can generate
+// its own, more unique game event. 
+// Return TRUE if you want the generic event generated after the callback
+// Return FALSE if you do not want the generic event generated
+typedef bool (*VisibilityMonitorCallback)( CBaseEntity *pVisibleEntity, CBasePlayer *pViewingPlayer );
+
+// This callback tells us which object is being seen, and by which client. The callback returns 'true'
+// to allow visibility monitor to acknowledge the event, or false to suppress the event.
+typedef bool (*VisibilityMonitorEvaluator)( CBaseEntity *pVisibleEntity, CBasePlayer *pViewingPlayer );
+
+extern void VisibilityMonitor_AddEntity( CBaseEntity *pEntity, float flMinDist, VisibilityMonitorCallback pfnCallback, VisibilityMonitorEvaluator pfnEvaluator );
+extern void VisibilityMonitor_RemoveEntity( CBaseEntity *pEntity );