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diff --git a/engine/shadowmgr.h b/engine/shadowmgr.h
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+++ b/engine/shadowmgr.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//
+//===========================================================================//
+
+#ifndef SHADOWMGR_H
+#define SHADOWMGR_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "engine/ishadowmgr.h"
+#include "mathlib/vmatrix.h"
+#include "surfacehandle.h"
+#include "mathlib/ssemath.h"
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+class CDispInfo;
+
+
+//-----------------------------------------------------------------------------
+// Shadow decals are applied to a single surface
+//-----------------------------------------------------------------------------
+typedef unsigned short ShadowDecalHandle_t;
+
+enum
+{
+	SHADOW_DECAL_HANDLE_INVALID = (ShadowDecalHandle_t)~0
+};
+
+
+//-----------------------------------------------------------------------------
+// This structure contains the vertex information for shadows
+//-----------------------------------------------------------------------------
+struct ShadowVertex_t
+{
+	Vector	m_Position;
+	Vector	m_ShadowSpaceTexCoord;
+};
+
+
+//-----------------------------------------------------------------------------
+// This structure contains info to accelerate shadow darkness computation
+//-----------------------------------------------------------------------------
+struct ShadowDecalRenderInfo_t
+{
+	Vector2D m_vTexOrigin;
+	Vector2D m_vTexSize;
+	float m_flFalloffOffset;
+	float m_flOOZFalloffDist;
+	float m_flFalloffAmount;
+	float m_flFalloffBias;
+};
+
+
+//-----------------------------------------------------------------------------
+// Shadow-related functionality internal to the engine
+//-----------------------------------------------------------------------------
+abstract_class IShadowMgrInternal : public IShadowMgr
+{
+public:
+	virtual void LevelInit( int nSurfCount ) = 0;
+	virtual void LevelShutdown() = 0;
+
+	// This surface has been rendered; and we'll want to render the shadows
+	// on this surface
+	virtual void AddShadowsOnSurfaceToRenderList( ShadowDecalHandle_t decalHandle ) = 0;
+
+	// This will render all shadows that were previously added using
+	// AddShadowsOnSurfaceToRenderList. If there's a model to world transform
+	// for the shadow receiver, then send it in!
+	// NOTE: This draws both shadows and projected textures.
+	virtual void RenderProjectedTextures( VMatrix const* pModelToWorld = 0 ) = 0;
+
+	// NOTE: This draws shadows
+	virtual void RenderShadows( VMatrix const* pModelToWorld = 0 ) = 0;
+
+	// NOTE: This draws flashlights
+	virtual void RenderFlashlights( bool bDoMasking, VMatrix const* pModelToWorld = 0 ) = 0;
+
+	// Clears the list of shadows to render 
+	virtual void ClearShadowRenderList() = 0;
+
+	// Projects + clips shadows
+	// count + ppPosition describe an array of pointers to vertex positions
+	// of the unclipped shadow
+	// ppOutVertex is pointed to the head of an array of pointers to
+	// clipped vertices the function returns the number of clipped vertices
+	virtual int ProjectAndClipVertices( ShadowHandle_t handle, int count, 
+		Vector** ppPosition, ShadowVertex_t*** ppOutVertex ) = 0;
+
+	// Computes information for rendering
+	virtual void ComputeRenderInfo( ShadowDecalRenderInfo_t* pInfo, ShadowHandle_t handle ) const = 0;
+
+	// Shadow state...
+	virtual unsigned short InvalidShadowIndex( ) = 0;
+	virtual void SetModelShadowState( ModelInstanceHandle_t instance ) = 0;
+
+	virtual void SetNumWorldMaterialBuckets( int numMaterialSortBins ) = 0;
+
+	virtual void DrawFlashlightDecals( int sortGroup, bool bDoMasking ) = 0;
+
+	virtual void DrawFlashlightDecalsOnSingleSurface( SurfaceHandle_t surfID, bool bDoMasking ) = 0;
+
+	virtual void DrawFlashlightOverlays( int nSortGroup, bool bDoMasking ) = 0;
+
+	virtual void DrawFlashlightDepthTexture( ) = 0;
+
+	virtual void DrawFlashlightDecalsOnDisplacements( int sortGroup, CDispInfo **visibleDisps, int nVisibleDisps, bool bDoMasking ) = 0;
+
+	virtual void SetFlashlightStencilMasks( bool bDoMasking ) = 0;
+	virtual bool ModelHasShadows( ModelInstanceHandle_t instance ) = 0;
+
+	// Converts z value to darkness
+	inline unsigned char ComputeDarkness( float z, const ShadowDecalRenderInfo_t& info ) const;
+};
+
+
+//-----------------------------------------------------------------------------
+// inline methods
+//-----------------------------------------------------------------------------
+inline unsigned char IShadowMgrInternal::ComputeDarkness( float z, const ShadowDecalRenderInfo_t& info ) const
+{
+	// NOTE: 0 means black, non-zero adds towards white...
+	z = ( z - info.m_flFalloffOffset ) * info.m_flOOZFalloffDist;
+	z = fsel( z, z, 0.0f );
+	z = info.m_flFalloffBias + z * info.m_flFalloffAmount;
+	z = fsel( z - 255.0f, 255.0f, z );
+	return z;
+}
+
+
+//-----------------------------------------------------------------------------
+// Singleton
+//-----------------------------------------------------------------------------
+extern IShadowMgrInternal* g_pShadowMgr;
+
+#endif