class TGLStopwatch


TGLStopwatch

Stopwatch object for timing GL work. We do not use the TStopwatch as
we need to perform GL flushing to get accurate times + we record
timing overheads here.

Function Members (Methods)

public:

	TGLStopwatch()
	TGLStopwatch(const TGLStopwatch&)
virtual	~TGLStopwatch()
static TClass*	Class()
Double_t	End()
virtual TClass*	IsA() const
Double_t	Lap() const
TGLStopwatch&	operator=(const TGLStopwatch&)
virtual void	ShowMembers(TMemberInspector& insp, char* parent)
void	Start()
virtual void	Streamer(TBuffer& b)
void	StreamerNVirtual(TBuffer& b)

private:

void	FinishDrawing() const
Double_t	GetClock() const
void	InitOverhead() const
Double_t	WaitForTick() const

Data Members

private:

Double_t	fStart	! start time (millisec)
static Bool_t	fgInitOverhead	! overhead calculated?
static Double_t	fgOverhead	! timing overhead (millisecs)

Class Charts

Inheritance Inherited Members Includes Libraries

Function documentation

TGLStopwatch(const TGLStopwatch& )

 Construct stopwatch object, initialising timing overheads if not done.

~TGLStopwatch()

 Destroy stopwatch object

void Start()

 Start timing.

Double_t Lap()

 Return lap time since Start(), in milliseconds.

Double_t End()

 End timing, return total time since Start(), in milliseconds.

Double_t GetClock(void)

 Get internal clock time, in milliseconds.

void FinishDrawing(void)

 Force completion of GL drawing.

Double_t WaitForTick(void)

 Wait for next clock increment - return it in milliseconds

void InitOverhead(void)

 Calcualte timing overhead.

TGLStopwatch(const TGLStopwatch& )

Author: Richard Maunder 25/05/2005
Last update: root/gl:$Name: $:$Id: TGLStopwatch.cxx,v 1.9 2007/06/11 19:56:34 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *

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