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diff --git a/game/client/client_virtualreality.h b/game/client/client_virtualreality.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: The implementation of ISourceVirtualReality, which provides utility
+//			functions for VR including head tracking, window/viewport information,
+//			rendering information, and distortion
+//
+//=============================================================================
+
+#ifndef CLIENTVIRTUALREALITY_H
+#define CLIENTVIRTUALREALITY_H
+#if defined( _WIN32 )
+#pragma once
+#endif
+
+#include "tier3/tier3.h"
+#include "iclientvirtualreality.h"
+#include "view_shared.h"
+
+enum HeadtrackMovementMode_t
+{
+	HMM_SHOOTFACE_MOVEFACE = 0,		// Shoot from your face, move along your face.
+	HMM_SHOOTFACE_MOVETORSO,		// Shoot from your face, move the direction your torso is facing.
+	HMM_SHOOTMOUSE_MOVEFACE,		// Shoot from the mouse cursor which moves within the HUD, move along your face.
+	HMM_SHOOTBOUNDEDMOUSE_LOOKFACE_MOVEFACE,	// Shoot from the mouse cursor which moves, bounded within the HUD, move along your face.
+	HMM_SHOOTBOUNDEDMOUSE_LOOKFACE_MOVEMOUSE,	// Shoot from the mouse cursor which moves, bounded within the HUD, move along your weapon (the "mouse")
+
+	// The following are not intended to be user-selectable modes, they are used by e.g. followcam stuff.
+	HMM_SHOOTMOVELOOKMOUSEFACE,		// Shoot & move & look along the mouse cursor (i.e. original unchanged gameplay), face just looks on top of that.
+	HMM_SHOOTMOVEMOUSE_LOOKFACE,	// Shoot & move along the mouse cursor (i.e. original unchanged gameplay), face just looks.
+	HMM_SHOOTMOVELOOKMOUSE,			// Shoot, move and look along the mouse cursor - HMD orientation is completely ignored!
+
+	HMM_LAST,
+
+	HMM_NOOVERRIDE = HMM_LAST		// Used as a retrun from ShouldOverrideHeadtrackControl(), not an actual mode.
+};
+
+
+//-----------------------------------------------------------------------------
+// The implementation
+//-----------------------------------------------------------------------------
+
+
+class CClientVirtualReality: public CTier3AppSystem< IClientVirtualReality >
+{
+	typedef CTier3AppSystem< IClientVirtualReality > BaseClass;
+
+public:
+
+	CClientVirtualReality();
+	~CClientVirtualReality();
+
+	//---------------------------------------------------------
+	// Initialization and shutdown
+	//---------------------------------------------------------
+
+	//
+	// IAppSystem
+	//
+	virtual bool							Connect( CreateInterfaceFn factory );
+	virtual void							Disconnect();
+	virtual void *							QueryInterface( const char *pInterfaceName );
+
+	// these will come from the engine
+	virtual InitReturnVal_t					Init();
+	virtual void							Shutdown();
+
+	// Called when startup is complete
+	void StartupComplete();
+
+	//---------------------------------------------------------
+	// IClientVirtualReality implementation
+	//---------------------------------------------------------
+	virtual void DrawMainMenu() OVERRIDE;
+
+
+	//---------------------------------------------------------
+	// VR utilities for use in the client
+	//---------------------------------------------------------
+	bool OverrideView ( CViewSetup *pViewMiddle, Vector *pViewModelOrigin, QAngle *pViewModelAngles, HeadtrackMovementMode_t hmmMovementOverride );
+	bool OverrideStereoView( CViewSetup *pViewMiddle, CViewSetup *pViewLeft, CViewSetup *pViewRight );
+	bool OverridePlayerMotion( float flInputSampleFrametime, const QAngle &oldAngles, const QAngle &curAngles, const Vector &curMotion, QAngle *pNewAngles, Vector *pNewMotion );
+	bool OverrideWeaponHudAimVectors ( Vector *pAimOrigin, Vector *pAimDirection );
+	bool CurrentlyZoomed();
+	void OverrideTorsoTransform( const Vector & position, const QAngle & angles ) ;
+	void CancelTorsoTransformOverride( ) ;
+	bool CanOverlayHudQuad();
+	void GetHUDBounds( Vector *pViewer, Vector *pUL, Vector *pUR, Vector *pLL, Vector *pLR );
+	void RenderHUDQuad( bool bBlackout, bool bTranslucent );
+	float GetZoomedModeMagnification();
+	bool ProcessCurrentTrackingState( float fGameFOV );
+	const VMatrix &GetHudProjectionFromWorld();
+	void GetTorsoRelativeAim( Vector *pPosition, QAngle *pAngles );
+	float GetHUDDistance();
+	bool ShouldRenderHUDInWorld();
+	const VMatrix & GetWorldFromMidEye() const { return m_WorldFromMidEyeNoDebugCam; }
+	void OverrideViewModelTransform( Vector & vmorigin, QAngle & vmangles, bool bUseLargeOverride );
+	void AlignTorsoAndViewToWeapon();
+	void PostProcessFrame( StereoEye_t eEye );
+	void OverlayHUDQuadWithUndistort( const CViewSetup &view, bool bDoUndistort, bool bBlackout, bool bTranslucent );
+
+	//---------------------------------------------------------
+	// Enter/leave VR mode
+	//---------------------------------------------------------
+	void Activate();
+	void Deactivate();
+
+private:
+	HeadtrackMovementMode_t m_hmmMovementActual;
+
+	// Where the current mideye is relative to the (game)world.
+	VMatrix			m_WorldFromMidEye;
+
+	// used for drawing the HUD
+	float			m_fHudHorizontalFov;
+	VMatrix			m_WorldFromHud;
+	VMatrix			m_HudProjectionFromWorld;
+	float			m_fHudHalfWidth;
+	float			m_fHudHalfHeight;
+
+	// Where the current mideye is relative to the zero (torso) (currently always the same as m_MideyeZeroFromMideyeCurrent!)
+	VMatrix			m_TorsoFromMideye;
+
+	// The debug cam will play with the above, but some things want the non-debug view.
+	VMatrix			m_WorldFromMidEyeNoDebugCam;
+
+	// Where the weapon is currently pointing (note the translation will be zero - this is just orientation)
+	VMatrix			m_WorldFromWeapon;
+
+	// The player's current torso angles/pos in the world.
+	QAngle			m_PlayerTorsoAngle;
+	Vector			m_PlayerTorsoOrigin;
+	Vector			m_PlayerLastMovement;
+
+	// The player's current view angles/pos in the world.
+	QAngle			m_PlayerViewAngle;
+	Vector			m_PlayerViewOrigin;
+
+	// The amount of zoom to apply to the view of the world (but NOT to the HUD!). Used for sniper weapons, etc.
+	float			m_WorldZoomScale;
+
+	// for overriding torso position in vehicles
+	QAngle			m_OverrideTorsoAngle;
+	QAngle			m_OverrideTorsoOffset;
+	bool			m_bOverrideTorsoAngle;
+
+	// While this is >0, we keep forcing the torso (and maybe view) to the weapon.
+	int				m_iAlignTorsoAndViewToWeaponCountdown;
+
+	bool			m_bMotionUpdated;
+
+	RTime32			m_rtLastMotionSample;
+
+	// video mode we had before we entered VR mode
+	bool m_bNonVRWindowed;
+	int m_nNonVRWidth;
+	int m_nNonVRHeight;
+#if defined( USE_SDL )
+    int m_nNonVRSDLDisplayIndex;
+#endif
+    bool m_bNonVRRawInput;
+};
+
+extern CClientVirtualReality g_ClientVirtualReality;
+
+#endif // CLIENTVIRTUALREALITY_H