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diff --git a/mp/src/public/sourcevr/isourcevirtualreality.h b/mp/src/public/sourcevr/isourcevirtualreality.h
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+++ b/mp/src/public/sourcevr/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
+//-----------------------------------------------------------------------------
+class ITexture;
+class IMaterialSystem;
+
+//-----------------------------------------------------------------------------
+// important enumeration
+//-----------------------------------------------------------------------------
+
+struct VRRect_t
+{
+	int32 nX;
+	int32 nY;
+	int32 nWidth;
+	int32 nHeight;
+};
+
+
+// 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
+	};
+
+	// Which texture is being requested in GetRenderTarget?
+	enum EWhichRenderTarget
+	{
+		RT_Color = 0,
+		RT_Depth,
+	};
+
+
+	// ----------------------------------------------------------------------
+	// General utilities
+	// ----------------------------------------------------------------------
+
+	// Returns true if the game should run in VR mode
+	virtual bool ShouldRunInVR() = 0;
+
+	// Returns true if there is a compatible HMD connected 
+	virtual bool IsHmdConnected() = 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 ( VREye eEye ) = 0;
+
+	// Composites the HUD directly onto the backbuffer / render target, including undistort.
+	virtual bool CompositeHud ( VREye eEye, float ndcHudBounds[4], bool bDoUndistort, bool bBlackout, bool bTranslucent ) = 0;
+
+	// ----------------------------------------------------------------------
+	// Getting the current pose
+	// ----------------------------------------------------------------------
+
+	// returns the pose relative to the zero point
+	virtual VMatrix GetMideyePose() = 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
+	// ----------------------------------------------------------------------
+
+	// Passes back the bounds of the window that the game should create. This might
+	// span two displays if we're dealing with a two-input display. Returns true
+	// if the bounds were set.
+	virtual bool GetDisplayBounds( VRRect_t *pRect ) = 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 transform from the mid-eye to the specified eye. Multiply this by 
+	// the tweaked (for mouse rotation and WASD translation) mideye position to get the
+	// view matrix. This matrix takes the user's IPD into account.
+	virtual VMatrix GetMidEyeFromEye( VREye eEye ) = 0;
+
+	// returns the adapter index to use for VR mode
+	virtual int GetVRModeAdapter() = 0;
+
+	// ----------------------------------------------------------------------
+	// Information about the tracker
+	// ----------------------------------------------------------------------
+
+	virtual bool WillDriftInYaw() = 0;
+
+	// ----------------------------------------------------------------------
+	// Methods about oversized offscreen rendering
+	// ----------------------------------------------------------------------
+
+	// Sets up the pre-distortion render targets.
+	virtual void CreateRenderTargets( IMaterialSystem *pMaterialSystem ) = 0;
+	virtual void ShutdownRenderTargets() = 0;
+
+	// fetches the render target for the specified eye
+	virtual ITexture *GetRenderTarget( VREye eEye, EWhichRenderTarget eWhich ) = 0;
+
+	// Returns the (possibly overridden) framebuffer size for render target sizing.
+	virtual void				GetRenderTargetFrameBufferDimensions( int & nWidth, int & nHeight ) = 0;
+
+	// ----------------------------------------------------------------------
+	// Enter/leave VR mode
+	// ----------------------------------------------------------------------
+	virtual bool Activate() = 0;
+	virtual void Deactivate() = 0;
+
+
+};
+
+
+
+//-----------------------------------------------------------------------------
+
+extern ISourceVirtualReality *g_pSourceVR;
+
+inline bool UseVR()
+{
+	return g_pSourceVR != NULL && g_pSourceVR->ShouldRunInVR();
+}
+
+#endif // ISOURCEVIRTUALREALITY_H