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diff --git a/mp/src/public/datacache/imdlcache.h b/mp/src/public/datacache/imdlcache.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// The copyright to the contents herein is the property of Valve, L.L.C.
+// The contents may be used and/or copied only with the written permission of
+// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
+// the agreement/contract under which the contents have been supplied.
+//
+// $Header: $
+// $NoKeywords: $
+//
+// model loading and caching
+//
+//=============================================================================
+
+#ifndef IMDLCACHE_H
+#define IMDLCACHE_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "appframework/IAppSystem.h"
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+struct studiohdr_t;
+struct studiohwdata_t;
+struct vcollide_t;
+struct virtualmodel_t;
+struct vertexFileHeader_t;
+
+namespace OptimizedModel
+{
+	struct FileHeader_t;
+}
+
+
+//-----------------------------------------------------------------------------
+// Reference to a loaded studiomdl 
+//-----------------------------------------------------------------------------
+typedef unsigned short MDLHandle_t;
+
+enum
+{
+	MDLHANDLE_INVALID = (MDLHandle_t)~0 
+};
+
+
+//-----------------------------------------------------------------------------
+// Cache data types
+//-----------------------------------------------------------------------------
+enum MDLCacheDataType_t
+{
+	// Callbacks to get called when data is loaded or unloaded for these:
+	MDLCACHE_STUDIOHDR = 0,
+	MDLCACHE_STUDIOHWDATA,
+	MDLCACHE_VCOLLIDE,
+
+	// Callbacks NOT called when data is loaded or unloaded for these:
+	MDLCACHE_ANIMBLOCK,
+	MDLCACHE_VIRTUALMODEL,
+	MDLCACHE_VERTEXES,
+	MDLCACHE_DECODEDANIMBLOCK,
+};
+
+abstract_class IMDLCacheNotify
+{
+public:
+	// Called right after the data is loaded
+	virtual void OnDataLoaded( MDLCacheDataType_t type, MDLHandle_t handle ) = 0;
+
+	// Called right before the data is unloaded
+	virtual void OnDataUnloaded( MDLCacheDataType_t type, MDLHandle_t handle ) = 0;
+};
+
+
+//-----------------------------------------------------------------------------
+// Flags for flushing 
+//-----------------------------------------------------------------------------
+enum MDLCacheFlush_t
+{
+	MDLCACHE_FLUSH_STUDIOHDR		= 0x01,
+	MDLCACHE_FLUSH_STUDIOHWDATA		= 0x02,
+	MDLCACHE_FLUSH_VCOLLIDE			= 0x04,
+	MDLCACHE_FLUSH_ANIMBLOCK		= 0x08,
+	MDLCACHE_FLUSH_VIRTUALMODEL		= 0x10,
+	MDLCACHE_FLUSH_AUTOPLAY         = 0x20,
+	MDLCACHE_FLUSH_VERTEXES         = 0x40,
+
+	MDLCACHE_FLUSH_IGNORELOCK       = 0x80000000,
+	MDLCACHE_FLUSH_ALL              = 0xFFFFFFFF
+};
+
+/*
+#define MDLCACHE_INTERFACE_VERSION_4 "MDLCache004"
+
+namespace MDLCacheV4
+{
+
+abstract_class IMDLCache : public IAppSystem
+{
+public:
+	// Used to install callbacks for when data is loaded + unloaded
+	virtual void SetCacheNotify( IMDLCacheNotify *pNotify ) = 0;
+	// NOTE: This assumes the "GAME" path if you don't use
+	// the UNC method of specifying files. This will also increment
+	// the reference count of the MDL
+	virtual MDLHandle_t FindMDL( const char *pMDLRelativePath ) = 0;
+
+	// Reference counting
+	virtual int AddRef( MDLHandle_t handle ) = 0;
+	virtual int Release( MDLHandle_t handle ) = 0;
+
+	// Gets at the various data associated with a MDL
+	virtual studiohdr_t *GetStudioHdr( MDLHandle_t handle ) = 0;
+	virtual studiohwdata_t *GetHardwareData( MDLHandle_t handle ) = 0;
+	virtual vcollide_t *GetVCollide( MDLHandle_t handle ) = 0;
+	virtual unsigned char *GetAnimBlock( MDLHandle_t handle, int nBlock ) = 0;
+	virtual virtualmodel_t *GetVirtualModel( MDLHandle_t handle ) = 0;
+	virtual int GetAutoplayList( MDLHandle_t handle, unsigned short **pOut ) = 0;
+	virtual vertexFileHeader_t *GetVertexData( MDLHandle_t handle ) = 0;
+
+	// Brings all data associated with an MDL into memory
+	virtual void TouchAllData( MDLHandle_t handle ) = 0;
+
+	// Gets/sets user data associated with the MDL
+	virtual void SetUserData( MDLHandle_t handle, void* pData ) = 0;
+	virtual void *GetUserData( MDLHandle_t handle ) = 0;
+
+	// Is this MDL using the error model?
+	virtual bool IsErrorModel( MDLHandle_t handle ) = 0;
+
+	// Flushes the cache, force a full discard
+	virtual void Flush( int nFlushFlags = MDLCACHE_FLUSH_ALL ) = 0;
+
+	// Flushes a particular model out of memory
+	virtual void Flush( MDLHandle_t handle, int nFlushFlags = MDLCACHE_FLUSH_ALL ) = 0;
+
+	// Returns the name of the model (its relative path)
+	virtual const char *GetModelName( MDLHandle_t handle ) = 0;
+
+	// faster access when you already have the studiohdr
+	virtual virtualmodel_t *GetVirtualModelFast( const studiohdr_t *pStudioHdr, MDLHandle_t handle ) = 0;
+
+	// all cache entries that subsequently allocated or successfully checked 
+	// are considered "locked" and will not be freed when additional memory is needed
+	virtual void BeginLock() = 0;
+
+	// reset all protected blocks to normal
+	virtual void EndLock() = 0;
+
+	// returns a pointer to a counter that is incremented every time the cache has been out of the locked state (EVIL)
+	virtual int *GetFrameUnlockCounterPtr()  = 0;
+
+	// Finish all pending async operations
+	virtual void FinishPendingLoads() = 0;	
+};
+
+
+}
+*/
+
+//-----------------------------------------------------------------------------
+// The main MDL cacher 
+//-----------------------------------------------------------------------------
+#define MDLCACHE_INTERFACE_VERSION "MDLCache004"
+ 
+abstract_class IMDLCache : public IAppSystem
+{
+public:
+	// Used to install callbacks for when data is loaded + unloaded
+	// Returns the prior notify
+	virtual void SetCacheNotify( IMDLCacheNotify *pNotify ) = 0;
+
+	// NOTE: This assumes the "GAME" path if you don't use
+	// the UNC method of specifying files. This will also increment
+	// the reference count of the MDL
+	virtual MDLHandle_t FindMDL( const char *pMDLRelativePath ) = 0;
+
+	// Reference counting
+	virtual int AddRef( MDLHandle_t handle ) = 0;
+	virtual int Release( MDLHandle_t handle ) = 0;
+	virtual int GetRef( MDLHandle_t handle ) = 0;
+
+	// Gets at the various data associated with a MDL
+	virtual studiohdr_t *GetStudioHdr( MDLHandle_t handle ) = 0;
+	virtual studiohwdata_t *GetHardwareData( MDLHandle_t handle ) = 0;
+	virtual vcollide_t *GetVCollide( MDLHandle_t handle ) = 0;
+	virtual unsigned char *GetAnimBlock( MDLHandle_t handle, int nBlock ) = 0;
+	virtual virtualmodel_t *GetVirtualModel( MDLHandle_t handle ) = 0;
+	virtual int GetAutoplayList( MDLHandle_t handle, unsigned short **pOut ) = 0;
+	virtual vertexFileHeader_t *GetVertexData( MDLHandle_t handle ) = 0;
+
+	// Brings all data associated with an MDL into memory
+	virtual void TouchAllData( MDLHandle_t handle ) = 0;
+
+	// Gets/sets user data associated with the MDL
+	virtual void SetUserData( MDLHandle_t handle, void* pData ) = 0;
+	virtual void *GetUserData( MDLHandle_t handle ) = 0;
+
+	// Is this MDL using the error model?
+	virtual bool IsErrorModel( MDLHandle_t handle ) = 0;
+
+	// Flushes the cache, force a full discard
+	virtual void Flush( MDLCacheFlush_t nFlushFlags = MDLCACHE_FLUSH_ALL ) = 0;
+
+	// Flushes a particular model out of memory
+	virtual void Flush( MDLHandle_t handle, int nFlushFlags = MDLCACHE_FLUSH_ALL ) = 0;
+
+	// Returns the name of the model (its relative path)
+	virtual const char *GetModelName( MDLHandle_t handle ) = 0;
+
+	// faster access when you already have the studiohdr
+	virtual virtualmodel_t *GetVirtualModelFast( const studiohdr_t *pStudioHdr, MDLHandle_t handle ) = 0;
+
+	// all cache entries that subsequently allocated or successfully checked 
+	// are considered "locked" and will not be freed when additional memory is needed
+	virtual void BeginLock() = 0;
+
+	// reset all protected blocks to normal
+	virtual void EndLock() = 0;
+
+	// returns a pointer to a counter that is incremented every time the cache has been out of the locked state (EVIL)
+	virtual int *GetFrameUnlockCounterPtrOLD() = 0;
+
+	// Finish all pending async operations
+	virtual void FinishPendingLoads() = 0;
+
+	virtual vcollide_t *GetVCollideEx( MDLHandle_t handle, bool synchronousLoad = true ) = 0;
+	virtual bool GetVCollideSize( MDLHandle_t handle, int *pVCollideSize ) = 0;
+
+	virtual bool GetAsyncLoad( MDLCacheDataType_t type ) = 0;
+	virtual bool SetAsyncLoad( MDLCacheDataType_t type, bool bAsync ) = 0;
+
+	virtual void BeginMapLoad() = 0;
+	virtual void EndMapLoad() = 0;
+	virtual void MarkAsLoaded( MDLHandle_t handle ) = 0;
+
+	virtual void InitPreloadData( bool rebuild ) = 0;
+	virtual void ShutdownPreloadData() = 0;
+
+	virtual bool IsDataLoaded( MDLHandle_t handle, MDLCacheDataType_t type ) = 0;
+
+	virtual int *GetFrameUnlockCounterPtr( MDLCacheDataType_t type ) = 0;
+
+	virtual studiohdr_t *LockStudioHdr( MDLHandle_t handle ) = 0;
+	virtual void UnlockStudioHdr( MDLHandle_t handle ) = 0;
+
+	virtual bool PreloadModel( MDLHandle_t handle ) = 0;
+
+	// Hammer uses this. If a model has an error loading in GetStudioHdr, then it is flagged
+	// as an error model and any further attempts to load it will just get the error model.
+	// That is, until you call this function. Then it will load the correct model.
+	virtual void ResetErrorModelStatus( MDLHandle_t handle ) = 0;
+
+	virtual void MarkFrame() = 0;
+};
+
+
+//-----------------------------------------------------------------------------
+// Critical section helper code
+//-----------------------------------------------------------------------------
+class CMDLCacheCriticalSection
+{
+public:
+	CMDLCacheCriticalSection( IMDLCache *pCache ) : m_pCache( pCache )
+	{
+		m_pCache->BeginLock();
+	}
+
+	~CMDLCacheCriticalSection()
+	{
+		m_pCache->EndLock();
+	}
+
+private:
+	IMDLCache *m_pCache;
+};
+
+#define MDCACHE_FINE_GRAINED 1
+
+#if defined(MDCACHE_FINE_GRAINED)
+#define MDLCACHE_CRITICAL_SECTION_( pCache ) CMDLCacheCriticalSection cacheCriticalSection(pCache)
+#define MDLCACHE_COARSE_LOCK_( pCache ) ((void)(0))
+#elif defined(MDLCACHE_LEVEL_LOCKED)
+#define MDLCACHE_CRITICAL_SECTION_( pCache )  ((void)(0))
+#define MDLCACHE_COARSE_LOCK_( pCache ) ((void)(0))
+#else
+#define MDLCACHE_CRITICAL_SECTION_( pCache ) ((void)(0))
+#define MDLCACHE_COARSE_LOCK_( pCache ) CMDLCacheCriticalSection cacheCriticalSection(pCache)
+#endif
+#define MDLCACHE_CRITICAL_SECTION() MDLCACHE_CRITICAL_SECTION_(mdlcache)
+#define MDLCACHE_COARSE_LOCK() MDLCACHE_COARSE_LOCK_(mdlcache)
+
+#endif // IMDLCACHE_H
+