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diff --git a/mp/src/public/headtrack/isourcevirtualreality.h b/mp/src/public/headtrack/isourcevirtualreality.h
new file mode 100644
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+++ b/mp/src/public/headtrack/isourcevirtualreality.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Contains the IHeadTrack interface, which is implemented in headtrack.dll
+//
+// $NoKeywords: $
+//
+//===========================================================================//
+
+#ifndef ISOURCEVIRTUALREALITY_H
+#define ISOURCEVIRTUALREALITY_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "tier1/interface.h"
+#include "tier1/refcount.h"
+#include "appframework/IAppSystem.h"
+#include "mathlib/vmatrix.h"
+
+//-----------------------------------------------------------------------------
+// forward declarations
+//-----------------------------------------------------------------------------
+
+//-----------------------------------------------------------------------------
+// important enumeration
+//-----------------------------------------------------------------------------
+struct VRTrackerState_t
+{
+	// Tracker has finished starting up and has produced at least one valid pose.
+	bool bInitialized;
+
+	// Tracker currently has a valid pose.
+	bool bHasValidPose;
+
+	// Tracker is in a state where it is likely to suffer from yaw drift. This
+	// would apply to any gyro-only tracking system.
+	bool bWillDriftInYaw;
+};
+
+
+// NOTE NOTE NOTE!!!!  If you up this, grep for "NEW_INTERFACE" to see if there is anything
+// waiting to be enabled during an interface revision.
+#define SOURCE_VIRTUAL_REALITY_INTERFACE_VERSION "SourceVirtualReality001"
+
+//-----------------------------------------------------------------------------
+// The ISourceVirtualReality interface
+//-----------------------------------------------------------------------------
+
+
+
+abstract_class ISourceVirtualReality : public IAppSystem
+{
+public:
+	virtual ~ISourceVirtualReality() {}
+
+	// Placeholder for API revision
+	virtual bool Connect( CreateInterfaceFn factory ) = 0;
+	virtual void Disconnect() = 0;
+	virtual void *QueryInterface( const char *pInterfaceName ) = 0;
+	virtual InitReturnVal_t Init() = 0;
+	virtual void Shutdown() = 0;
+
+	// This enum is used to tell some of the other calls in this interface which eye
+	// is being requested.
+	enum VREye
+	{
+		VREye_Left = 0,
+		VREye_Right
+	};
+
+	// ----------------------------------------------------------------------
+	// General utilities
+	// ----------------------------------------------------------------------
+
+	// Returns true if the game should run in VR mode
+	virtual bool ShouldRunInVR() = 0;
+
+	// The name of the display at which the game should put its window. 
+	// TODO: This is pretty horrible from a "what the game has to do" point
+	// of view. Make it better.
+	virtual const char *GetDisplayName() = 0;
+
+	// The size of the window that the game should create
+	virtual bool GetWindowSize( int *pnWidth, int *pnHeight ) = 0;
+
+	// Lets engine tell headtrack that it's going to use a different size window based
+	// what the display is actually using. This happens when somebody clones
+	// their desktop onto the HMD
+	virtual void OverrideWindowSize( int nWidth, int nHeight ) = 0;
+
+	// The size and position of the viewport for the specified eye
+	virtual void GetViewportBounds( VREye eEye, int *pnX, int *pnY, int *pnWidth, int *pnHeight ) = 0;
+
+	// Performs the distortion post-processing.
+	virtual bool DoDistortionProcessing ( const vrect_t *SrcRect ) = 0;
+
+	// ----------------------------------------------------------------------
+	// Getting the current pose
+	// ----------------------------------------------------------------------
+
+	// returns the pose relative to the zero point
+	virtual VMatrix GetMideyePose() = 0;
+
+	// returns the gravity-relative HUD correction matrix (I think)
+	virtual VMatrix GetHudUpCorrection() = 0;
+
+	// transforms to mid eye form left/right
+	virtual VMatrix GetMidEyeFromLeft() = 0;
+	virtual VMatrix GetMidEyeFromRight() = 0;
+
+	// All-in-one interfaces (they call GetCameraPoseZeroFromCurrent)
+	// Grabs the current tracking data and sets up state for the Override* calls.
+	virtual bool SampleTrackingState ( float PlayerGameFov, float fPredictionSeconds ) = 0;
+
+	// ----------------------------------------------------------------------
+	// Information about the display
+	// ----------------------------------------------------------------------
+
+	// returns the serial number for the display or NULL if no serial number
+	// could be retrieved
+	virtual const char *GetDisplaySerialNumber() = 0;
+
+	// returns the model number for the display or NULL if no model number
+	// could be retrieved
+	virtual const char *GetDisplayModelNumber() = 0;
+
+	// returns the "ipd" of the display. This is the separation of the centers
+	// of the two lenses in mm
+	virtual float GetDisplaySeparationMM() = 0;
+
+	// Computes and returns the projection matrix for the eye
+	virtual bool GetEyeProjectionMatrix ( VMatrix *pResult, VREye, float zNear, float zFar, float fovScale ) = 0;
+
+	// Returns the horizontal FOV of the display in degrees
+	virtual float GetHorizontalFOVDegrees() = 0;
+
+	// ----------------------------------------------------------------------
+	// Information about the user
+	// ----------------------------------------------------------------------
+
+	// returns the intrapupilar distance of the user in mm
+	virtual float GetUserIPDMM() = 0;
+
+	// sets the intrapupilar distance of the user in mm
+	virtual void SetUserIPDMM( float fIPDMM ) = 0;
+
+
+	// ----------------------------------------------------------------------
+	// Information about the tracker
+	// ----------------------------------------------------------------------
+
+	// returns the state of the tracking system
+	virtual VRTrackerState_t GetTrackerState() = 0;
+};
+
+
+
+//-----------------------------------------------------------------------------
+
+extern ISourceVirtualReality *g_pSourceVR;
+
+inline bool UseVR()
+{
+	return g_pSourceVR != NULL && g_pSourceVR->ShouldRunInVR();
+}
+
+#endif // ISOURCEVIRTUALREALITY_H