Added original SDK code for Alien Swarm.

public/engine/IClientLeafSystem.h

@@ -0,0 +1,54 @@
+//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Revision: $
+// $NoKeywords: $
+//
+// This file contains code to allow us to associate client data with bsp leaves.
+//
+//=============================================================================//
+
+#if !defined( ICLIENTLEAFSYSTEM_H )
+#define ICLIENTLEAFSYSTEM_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "tier0/platform.h"
+#include "client_render_handle.h"
+#include "engine/ivmodelinfo.h"
+
+
+#define CLIENTLEAFSYSTEM_INTERFACE_VERSION	"ClientLeafSystem002"
+
+
+enum RenderableModelType_t
+{
+	RENDERABLE_MODEL_UNKNOWN_TYPE = -1,
+	RENDERABLE_MODEL_ENTITY = 0,
+	RENDERABLE_MODEL_STUDIOMDL,
+	RENDERABLE_MODEL_STATIC_PROP,
+	RENDERABLE_MODEL_BRUSH,
+};
+
+
+//-----------------------------------------------------------------------------
+// The client leaf system
+//-----------------------------------------------------------------------------
+abstract_class IClientLeafSystemEngine
+{
+public:
+	// Adds and removes renderables from the leaf lists
+	// CreateRenderableHandle stores the handle inside pRenderable.
+	virtual void CreateRenderableHandle( IClientRenderable* pRenderable, bool bRenderWithViewModels, RenderableTranslucencyType_t nType, RenderableModelType_t nModelType, uint32 nSplitscreenEnabled = 0xFFFFFFFF ) = 0; // = RENDERABLE_MODEL_UNKNOWN_TYPE ) = 0;
+	virtual void RemoveRenderable( ClientRenderHandle_t handle ) = 0;
+	virtual void AddRenderableToLeaves( ClientRenderHandle_t renderable, int nLeafCount, unsigned short *pLeaves ) = 0;
+	virtual void SetTranslucencyType( ClientRenderHandle_t handle, RenderableTranslucencyType_t nType ) = 0;
+};
+
+
+#endif	// ICLIENTLEAFSYSTEM_H
+
+