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diff --git a/engine/disp.h b/engine/disp.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef DISPINFO_H
+#define DISPINFO_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+//=============================================================================
+
+#include <assert.h>
+#include "idispinfo.h"
+#include "bspfile.h"
+#include "mathlib/vmatrix.h"
+#include "dispnode.h"
+#include "builddisp.h"
+#include "utlvector.h"
+#include "disp_helpers.h"
+#include "tier0/fasttimer.h"
+#include "dlight.h"
+#include "utllinkedlist.h"
+#include "zone.h"
+
+struct model_t;
+class IMesh;
+class CMeshBuilder;
+struct ShadowInfo_t;
+
+class CDecalNodeSetupCache;
+
+
+
+class CDispInfo : public IDispInfo, public CDispUtilsHelper
+{
+// IDispInfo overrides.
+public:
+	virtual				~CDispInfo();
+
+	virtual void		GetIntersectingSurfaces( GetIntersectingSurfaces_Struct *pStruct );
+	virtual void		RenderWireframeInLightmapPage( int pageId );
+	
+	virtual void		GetBoundingBox( Vector& bbMin, Vector& bbMax );
+
+	virtual void		SetParent( SurfaceHandle_t surfID );
+	virtual SurfaceHandle_t GetParent(); // returns surfID
+
+	// add the dlights on this surface to the lightmap buffer for updload
+	virtual void		AddDynamicLights( dlight_t *pLights, unsigned int lightMask );
+	// compute which dlights affect this surface
+	virtual unsigned int ComputeDynamicLightMask( dlight_t *pLights );
+
+	virtual DispDecalHandle_t	NotifyAddDecal( decal_t *pDecal, float flSize );
+	virtual void				NotifyRemoveDecal( DispDecalHandle_t h );
+	virtual DispShadowHandle_t	AddShadowDecal( ShadowHandle_t shadowHandle );
+	virtual void				RemoveShadowDecal( DispShadowHandle_t handle );
+
+	// Compute shadow fragments for a particular shadow
+	virtual bool		ComputeShadowFragments( DispShadowHandle_t h, int& vertexCount, int& indexCount );
+
+	virtual bool		GetTag();
+	virtual void		SetTag();
+	
+public:
+
+	//=========================================================================
+	//
+	// Construction/Decontruction
+	//
+	CDispInfo();
+
+	// Used for indexing displacements.
+	CDispInfo*	GetDispByIndex( int index )		{ return index == 0xFFFF ? 0 : &m_pDispArray->m_pDispInfos[index]; }
+	
+	// Get this displacement's index into the main array.
+	int			GetDispIndex()					{ return this - m_pDispArray->m_pDispInfos; }
+
+
+	//=========================================================================
+	//
+	// Flags
+	//
+	void		SetTouched( bool bTouched );
+	bool		IsTouched( void );
+
+	// Rendering.
+	void		ClearLOD();
+	
+	void		DrawDispAxes();
+	bool		Render( CGroupMesh *pGroup, bool bAllowDebugModes );
+	
+	// Add in the contribution of a dynamic light.
+	void		AddSingleDynamicLight( dlight_t& dl );
+	void		AddSingleDynamicLightBumped( dlight_t& dl );
+
+	// Add in the contribution of a dynamic alpha light.
+	void		AddSingleDynamicAlphaLight( dlight_t& dl );
+
+	// Cast a ray against this surface
+	bool		TestRay( Ray_t const& ray, float start, float end, float& dist, 
+						Vector2D* lightmapUV, Vector2D* texureUV );
+
+// CDispUtilsHelper implementation.
+public:
+
+	virtual const CPowerInfo*		GetPowerInfo() const;
+	virtual CDispNeighbor*			GetEdgeNeighbor( int index );
+	virtual CDispCornerNeighbors*	GetCornerNeighbors( int index );
+	virtual CDispUtilsHelper*		GetDispUtilsByIndex( int index );
+
+
+// Initialization functions.
+public:
+
+	// These are used to mess with indices.
+	int			VertIndex( int x, int y ) const;
+	int			VertIndex( CVertIndex const &vert ) const;
+	CVertIndex	IndexToVert( int index ) const;
+
+	// Helpers to test decal intersection bit on decals.
+	void		SetNodeIntersectsDecal( CDispDecal *pDispDecal, CVertIndex const &nodeIndex );
+	int			GetNodeIntersectsDecal( CDispDecal *pDispDecal, CVertIndex const &nodeIndex );
+
+
+public:
+
+	// Copy data from a ddispinfo_t.
+	void		CopyMapDispData( const ddispinfo_t *pBuildDisp );
+
+	// This is called from CreateStaticBuffers_All after the CCoreDispInfo is fully
+	// initialized. It just copies the data that it needs.
+	bool		CopyCoreDispData( 
+		model_t *pWorld,
+		const MaterialSystem_SortInfo_t *pSortInfos,
+		const CCoreDispInfo *pInfo,
+		bool bRestoring );
+
+	// called by CopyCoreDispData, just copies the vert data
+	void CopyCoreDispVertData( const CCoreDispInfo *pInfo, float bumpSTexCoordOffset );
+
+	// Checks the SURFDRAW_BUMPLIGHT flag and returns NUM_BUMP_VECTS+1 if it's set
+	// and 1 if not.
+	int			NumLightMaps();
+
+	// This calculates the vertex's position on the base surface.
+	// (Same result as CCoreDisp::GetFlatVert).
+	Vector		GetFlatVert( int iVertex );
+
+
+// Rendering functions.
+public:
+
+	// Set m_BBoxMin and m_BBoxMax. Uses g_TempDispVerts and assumes m_LODs have been validated.
+	void		UpdateBoundingBox();
+
+	// Number of verts per side.
+	int			GetSideLength() const;
+
+	// Return the total number of vertices.
+	int			NumVerts() const;
+
+	// Figure out the vector's projection in the decal's space.
+	void		DecalProjectVert( Vector const &vPos, CDispDecalBase *pDispDecal, ShadowInfo_t const* pInfo, Vector &out );
+
+	void		CullDecals( 
+		int iNodeBit,
+		CDispDecal **decals, 
+		int nDecals, 
+		CDispDecal **childDecals, 
+		int &nChildDecals );
+
+	void		TesselateDisplacement();
+
+	// Pass all the mesh data in to the material system.
+	void		SpecifyDynamicMesh();
+	void		SpecifyWalkableDynamicMesh( void );
+	void		SpecifyBuildableDynamicMesh( void );
+
+	// Clear all active verts except the corner verts.
+	void		InitializeActiveVerts();
+	
+	// Returns a particular vertex
+	CDispRenderVert* GetVertex( int i );
+
+	// Methods to compute lightmap coordinates, texture coordinates,
+	// and lightmap color based on displacement u,v
+	void ComputeLightmapAndTextureCoordinate( RayDispOutput_t const& output, 
+		Vector2D* luv, Vector2D* tuv );
+
+	// This little beastie generate decal fragments
+	void GenerateDecalFragments( CVertIndex const &nodeIndex, 
+		int iNodeBitIndex, unsigned short decalHandle, CDispDecalBase *pDispDecal );
+
+private:
+	// Two functions for adding decals
+	void TestAddDecalTri( int iIndexStart, unsigned short decalHandle, CDispDecal *pDispDecal );
+	void TestAddDecalTri( int iIndexStart, unsigned short decalHandle, CDispShadowDecal *pDispDecal );
+
+	// Allocates fragments...
+	CDispDecalFragment* AllocateDispDecalFragment( DispDecalHandle_t h, int nVerts = 6);
+
+	// Clears decal fragment lists
+	void ClearDecalFragments( DispDecalHandle_t h );
+	void ClearAllDecalFragments();
+
+	// Allocates fragments...
+	CDispShadowFragment* AllocateShadowDecalFragment( DispShadowHandle_t h, int nCount );
+
+	// Clears shadow decal fragment lists
+	void ClearShadowDecalFragments( DispShadowHandle_t h );
+	void ClearAllShadowDecalFragments();
+
+	// Used by GenerateDecalFragments
+	void GenerateDecalFragments_R( CVertIndex const &nodeIndex, 
+		int iNodeBitIndex, unsigned short decalHandle, CDispDecalBase *pDispDecal, int iLevel );
+
+	// Used to create a bitfield to help cull decal tests
+	void SetupDecalNodeIntersect( CVertIndex const &nodeIndex, int iNodeBitIndex,
+		CDispDecalBase *pDispDecal,	ShadowInfo_t const* pInfo );
+
+	// Used by SetupDecalNodeIntersect
+	bool SetupDecalNodeIntersect_R( CVertIndex const &nodeIndex, int iNodeBitIndex, 
+		CDispDecalBase *pDispDecal, ShadowInfo_t const* pInfo, int iLevel, CDecalNodeSetupCache* pCache );
+
+
+// Vertex/index data access.
+public:
+
+	// bounding box
+	Vector			m_BBoxMin;
+	Vector			m_BBoxMax;
+
+	int m_nIndices;		// The actual # of indices being used (it can be less than m_Indices.Count() if 
+						// our LOD is reducing the triangle count).
+	int				m_iIndexOffset;
+	// Used to get material..
+	CGroupMesh		*m_pMesh;
+	int				m_iVertOffset;
+	float			m_BumpSTexCoordOffset;
+
+	// This can be used to access the vertex data in a platform-independent way.
+	// XBOX will get them directly out of the static vertex buffer.
+	// PC gets them out of CDispRenderVerts.
+	CMeshReader m_MeshReader;
+
+	// List of all indices in the displacement in the current tesselation.
+	// These indices are straight into the static buffer (ie: they're not relative
+	// to m_iVertOffset).
+	CUtlVector<unsigned short>	m_Indices;
+
+	CUtlVector<CDispRenderVert, CHunkMemory<CDispRenderVert> > m_Verts;	// vectors that define the surface (size is NumVerts()).
+
+public:
+
+	// These bits tell which vertices and nodes are currently active.
+	// These start out the same as m_ErrorVerts but have verts added if 
+	// a neighbor needs to activate some verts.
+	CBitVec<CCoreDispInfo::MAX_VERT_COUNT>	m_ActiveVerts;
+
+	// These are set to 1 if the vert is allowed to become active.
+	// This is what takes care of different-sized neighbors.
+	CBitVec<CCoreDispInfo::MAX_VERT_COUNT>	m_AllowedVerts;
+
+	int				m_idLMPage;						// lightmap page id
+
+	SurfaceHandle_t	m_ParentSurfID;					// parent surfaceID
+	int				m_iPointStart;					// starting point (orientation) on base face
+
+	int				m_iLightmapAlphaStart;
+
+	int             m_Contents;                     // surface contents
+
+public:
+
+	bool            m_bTouched;                     // touched flag
+
+	int             m_fSurfProp;                    // surface properties flag - bump-mapping, etc.
+
+	int				m_Power;			// surface size (sides are 2^n+1).
+
+	unsigned short	*m_pTags;			// property tags
+
+	// Position and texcoordinates at the four corner points
+	Vector			m_BaseSurfacePositions[4];
+	Vector2D		m_BaseSurfaceTexCoords[4];
+
+	// Precalculated data for displacements of this size.
+	const CPowerInfo	*m_pPowerInfo;	
+
+	// Neighbor info for each side, indexed by NEIGHBOREDGE_ enums.
+	// First 4 are edge neighbors, the rest are corners.
+	CDispNeighbor			m_EdgeNeighbors[4];
+	CDispCornerNeighbors	m_CornerNeighbors[4];
+
+	// Copied from the ddispinfo. Speciifes where in g_DispLightmapSamplePositions the (compressed)
+	// lightmap sample positions start.
+	int				m_iLightmapSamplePositionStart;
+	
+	// The current triangulation for visualizing tag data.
+	int				m_nWalkIndexCount;
+	unsigned short  *m_pWalkIndices;
+
+	int				m_nBuildIndexCount;
+	unsigned short  *m_pBuildIndices;
+
+	// This here's a bunch of per-node information
+	DispNodeInfo_t	*m_pNodeInfo;
+
+	// Where the viewer was when we last tesselated.
+	// When the viewer moves out of the sphere, UpdateLOD is called.
+	Vector			m_ViewerSphereCenter;
+
+	// Used to make sure it doesn't activate verts in the wrong dispinfos.
+	bool			m_bInUse;
+
+	// Decals + Shadow decals
+	DispDecalHandle_t	m_FirstDecal;
+	DispShadowHandle_t	m_FirstShadowDecal;
+
+	unsigned short	m_Index;	// helps in debugging
+	
+	// Current tag value.		
+	unsigned short	m_Tag;
+	CDispArray		*m_pDispArray;
+};
+
+
+extern int g_nDispTris;
+extern CCycleCount g_DispRenderTime;
+extern bool DispInfoRenderDebugModes();
+
+// --------------------------------------------------------------------------------- //
+// CDispInfo functions.
+// --------------------------------------------------------------------------------- //
+
+inline int CDispInfo::GetSideLength() const
+{
+	return m_pPowerInfo->m_SideLength;
+}
+
+
+inline int CDispInfo::NumVerts() const
+{
+	Assert( m_Verts.Count() == m_pPowerInfo->m_MaxVerts );
+	return m_pPowerInfo->m_MaxVerts;
+}
+
+//-----------------------------------------------------------------------------
+// Returns a particular vertex
+//-----------------------------------------------------------------------------
+
+inline CDispRenderVert* CDispInfo::GetVertex( int i )
+{
+	Assert( i < NumVerts() );
+	return &m_Verts[i];
+}
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline void CDispInfo::SetTouched( bool bTouched )
+{
+	m_bTouched = bTouched;
+}
+
+
+//-----------------------------------------------------------------------------
+//-----------------------------------------------------------------------------
+inline bool CDispInfo::IsTouched( void )
+{
+	return m_bTouched; 
+}
+
+
+inline int CDispInfo::VertIndex( int x, int y ) const
+{
+	Assert( x >= 0 && x < GetSideLength() && y >= 0 && y < GetSideLength() );
+	return y * GetSideLength() + x;
+}
+
+
+inline int CDispInfo::VertIndex( CVertIndex const &vert ) const
+{
+	Assert( vert.x >= 0 && vert.x < GetSideLength() && vert.y >= 0 && vert.y < GetSideLength() );
+	return vert.y * GetSideLength() + vert.x;
+}
+
+
+void DispInfo_BatchDecals( CDispInfo **pVisibleDisps, int nVisibleDisps );
+void DispInfo_DrawDecals( CDispInfo **pVisibleDisps, int nVisibleDisps );
+
+#endif // DISPINFO_H