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//===== Copyright (c), Valve Corporation, All rights reserved. ======//
//
// Purpose: Contains the IHeadTrack interface, which is implemented in headtrack.dll
//
// $NoKeywords: $
//
//===========================================================================//
#ifndef IHEADTRACK_H
#define IHEADTRACK_H
#ifdef _WIN32
#pragma once
#endif
#include "tier1/interface.h"
#include "tier1/refcount.h"
#include "appframework/IAppSystem.h"
#include "mathlib/vmatrix.h"
#include "view_shared.h"
//-----------------------------------------------------------------------------
// forward declarations
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// important enumeration
//-----------------------------------------------------------------------------
// 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 HEAD_TRACK_INTERFACE_VERSION "VHeadTrack001"
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------
abstract_class IHeadTrack : public IAppSystem
{
public:
virtual ~IHeadTrack() {}
// 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;
//-----------------------------------------------------------------------------
// Tracking section
//-----------------------------------------------------------------------------
// All methods return true on success, false on failure.
// Also sets the zero pose
virtual bool ResetTracking() = 0;
// Set the current pose as the "zero"
virtual bool SetCurrentCameraAsZero() = 0;
// Raw interfaces - one one or other of these, not both (GetCameraPoseZeroFromCurrent calls GetCameraFromWorldPose );
virtual bool GetCameraFromWorldPose ( VMatrix *pResultCameraFromWorldPose, VMatrix *pResultCameraFromWorldPoseUnpredicted = NULL, double *pflAcquireTime = NULL ) = 0;
virtual bool GetCameraPoseZeroFromCurrent ( VMatrix *pResultMatrix ) = 0;
// All-in-one interfaces (they call GetCameraPoseZeroFromCurrent)
// Grabs the current tracking data and sets up state for the Override* calls.
virtual bool ProcessCurrentTrackingState ( float PlayerGameFov ) = 0;
// Performs the distortion post-processing.
virtual bool DoDistortionProcessing ( const vrect_t *SrcRect ) = 0;
};
//-----------------------------------------------------------------------------
extern IHeadTrack *g_pHeadTrack;
inline bool UseHeadTracking()
{
return g_pHeadTrack != NULL;
}
#endif // IHEADTRACK_H
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