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diff --git a/game/client/clientleafsystem.h b/game/client/clientleafsystem.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Revision: $
+// $NoKeywords: $
+//
+// This file contains code to allow us to associate client data with bsp leaves.
+//
+//===========================================================================//
+
+#if !defined( CLIENTLEAFSYSTEM_H )
+#define CLIENTLEAFSYSTEM_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "igamesystem.h"
+#include "engine/IClientLeafSystem.h"
+#include "cdll_int.h"
+#include "ivrenderview.h"
+#include "tier1/mempool.h"
+#include "tier1/refcount.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+struct WorldListInfo_t;
+class IClientRenderable;
+class Vector;
+class CGameTrace;
+typedef CGameTrace trace_t;
+struct Ray_t;
+class Vector2D;
+class CStaticProp;
+
+
+//-----------------------------------------------------------------------------
+// Handle to an renderables in the client leaf system
+//-----------------------------------------------------------------------------
+enum
+{
+	DETAIL_PROP_RENDER_HANDLE = (ClientRenderHandle_t)0xfffe
+};
+
+
+class CClientRenderablesList : public CRefCounted<>
+{
+	DECLARE_FIXEDSIZE_ALLOCATOR( CClientRenderablesList );
+
+public:
+	enum
+	{
+		MAX_GROUP_ENTITIES = 4096
+	};
+
+	struct CEntry
+	{
+		IClientRenderable	*m_pRenderable;
+		unsigned short		m_iWorldListInfoLeaf; // NOTE: this indexes WorldListInfo_t's leaf list.
+		unsigned short		m_TwoPass;
+		ClientRenderHandle_t m_RenderHandle;
+	};
+
+	// The leaves for the entries are in the order of the leaves you call CollateRenderablesInLeaf in.
+	CEntry		m_RenderGroups[RENDER_GROUP_COUNT][MAX_GROUP_ENTITIES];
+	int			m_RenderGroupCounts[RENDER_GROUP_COUNT];
+};
+
+
+//-----------------------------------------------------------------------------
+// Used by CollateRenderablesInLeaf
+//-----------------------------------------------------------------------------
+struct SetupRenderInfo_t
+{
+	WorldListInfo_t *m_pWorldListInfo;
+	CClientRenderablesList *m_pRenderList;
+	Vector m_vecRenderOrigin;
+	Vector m_vecRenderForward;
+	int m_nRenderFrame;
+	int m_nDetailBuildFrame;	// The "render frame" for detail objects
+	float m_flRenderDistSq;
+	bool m_bDrawDetailObjects : 1;
+	bool m_bDrawTranslucentObjects : 1;
+
+	SetupRenderInfo_t()
+	{
+		m_bDrawDetailObjects = true;
+		m_bDrawTranslucentObjects = true;
+	}
+};
+
+
+//-----------------------------------------------------------------------------
+// A handle associated with shadows managed by the client leaf system
+//-----------------------------------------------------------------------------
+typedef unsigned short ClientLeafShadowHandle_t;
+enum
+{
+	CLIENT_LEAF_SHADOW_INVALID_HANDLE = (ClientLeafShadowHandle_t)~0 
+};
+
+
+//-----------------------------------------------------------------------------
+// The client leaf system
+//-----------------------------------------------------------------------------
+abstract_class IClientLeafShadowEnum
+{
+public:
+	// The user ID is the id passed into CreateShadow
+	virtual void EnumShadow( ClientShadowHandle_t userId ) = 0;
+};
+
+
+// subclassed by things which wish to add per-leaf data managed by the client leafsystem
+class CClientLeafSubSystemData
+{
+public:
+	virtual ~CClientLeafSubSystemData( void )
+	{
+	}
+};
+
+
+// defines for subsystem ids. each subsystem id uses up one pointer in each leaf
+#define CLSUBSYSTEM_DETAILOBJECTS 0
+#define N_CLSUBSYSTEMS 1
+
+
+
+//-----------------------------------------------------------------------------
+// The client leaf system
+//-----------------------------------------------------------------------------
+abstract_class IClientLeafSystem : public IClientLeafSystemEngine, public IGameSystemPerFrame
+{
+public:
+	// Adds and removes renderables from the leaf lists
+	virtual void AddRenderable( IClientRenderable* pRenderable, RenderGroup_t group ) = 0;
+
+	// This tells if the renderable is in the current PVS. It assumes you've updated the renderable
+	// with RenderableChanged() calls
+	virtual bool IsRenderableInPVS( IClientRenderable *pRenderable ) = 0;
+
+	virtual void SetSubSystemDataInLeaf( int leaf, int nSubSystemIdx, CClientLeafSubSystemData *pData ) =0;
+	virtual CClientLeafSubSystemData *GetSubSystemDataInLeaf( int leaf, int nSubSystemIdx ) =0;
+
+
+	virtual void SetDetailObjectsInLeaf( int leaf, int firstDetailObject, int detailObjectCount ) = 0;
+	virtual void GetDetailObjectsInLeaf( int leaf, int& firstDetailObject, int& detailObjectCount ) = 0;
+
+	// Indicates which leaves detail objects should be rendered from, returns the detais objects in the leaf
+	virtual void DrawDetailObjectsInLeaf( int leaf, int frameNumber, int& firstDetailObject, int& detailObjectCount ) = 0;
+
+	// Should we draw detail objects (sprites or models) in this leaf (because it's close enough to the view)
+	// *and* are there any objects in the leaf?
+	virtual bool ShouldDrawDetailObjectsInLeaf( int leaf, int frameNumber ) = 0;
+
+	// Call this when a renderable origin/angles/bbox parameters has changed
+	virtual void RenderableChanged( ClientRenderHandle_t handle ) = 0;
+
+	// Set a render group
+	virtual void SetRenderGroup( ClientRenderHandle_t handle, RenderGroup_t group ) = 0;
+
+	// Computes which leaf translucent objects should be rendered in
+	virtual void ComputeTranslucentRenderLeaf( int count, const LeafIndex_t *pLeafList, const LeafFogVolume_t *pLeafFogVolumeList, int frameNumber, int viewID ) = 0;
+
+	// Put renderables into their appropriate lists.
+	virtual void BuildRenderablesList( const SetupRenderInfo_t &info ) = 0;
+
+	// Put renderables in the leaf into their appropriate lists.
+	virtual void CollateViewModelRenderables( CUtlVector< IClientRenderable * >& opaqueList, CUtlVector< IClientRenderable * >& translucentList ) = 0;
+
+	// Call this to deactivate static prop rendering..
+	virtual void DrawStaticProps( bool enable ) = 0;
+
+	// Call this to deactivate small object rendering
+	virtual void DrawSmallEntities( bool enable ) = 0;
+
+	// The following methods are related to shadows...
+	virtual ClientLeafShadowHandle_t AddShadow( ClientShadowHandle_t userId, unsigned short flags ) = 0;
+	virtual void RemoveShadow( ClientLeafShadowHandle_t h ) = 0;
+
+	// Project a shadow
+	virtual void ProjectShadow( ClientLeafShadowHandle_t handle, int nLeafCount, const int *pLeafList ) = 0;
+
+	// Project a projected texture spotlight
+	virtual void ProjectFlashlight( ClientLeafShadowHandle_t handle, int nLeafCount, const int *pLeafList ) = 0;
+
+	// Find all shadow casters in a set of leaves
+	virtual void EnumerateShadowsInLeaves( int leafCount, LeafIndex_t* pLeaves, IClientLeafShadowEnum* pEnum ) = 0;
+
+	// Fill in a list of the leaves this renderable is in.
+	// Returns -1 if the handle is invalid.
+	virtual int GetRenderableLeaves( ClientRenderHandle_t handle, int leaves[128] ) = 0;
+
+	// Get leaves this renderable is in
+	virtual bool GetRenderableLeaf ( ClientRenderHandle_t handle, int* pOutLeaf, const int* pInIterator = 0, int* pOutIterator = 0 ) = 0;
+
+	// Use alternate translucent sorting algorithm (draw translucent objects in the furthest leaf they lie in)
+	virtual void EnableAlternateSorting( ClientRenderHandle_t handle, bool bEnable ) = 0;
+};
+
+
+//-----------------------------------------------------------------------------
+// Singleton accessor
+//-----------------------------------------------------------------------------
+extern IClientLeafSystem *g_pClientLeafSystem;
+inline IClientLeafSystem* ClientLeafSystem()
+{
+	return g_pClientLeafSystem;
+}
+
+
+#endif	// CLIENTLEAFSYSTEM_H
+
+