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TGLStopwatch.h
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1 // @(#)root/gl:$Id$
2 // Author: Richard Maunder 25/05/2005
3 
4 /*************************************************************************
5  * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers. *
6  * All rights reserved. *
7  * *
8  * For the licensing terms see $ROOTSYS/LICENSE. *
9  * For the list of contributors see $ROOTSYS/README/CREDITS. *
10  *************************************************************************/
11 
12 #ifndef ROOT_TGLStopwatch
13 #define ROOT_TGLStopwatch
14 
15 #include "Rtypes.h"
16 
17 //////////////////////////////////////////////////////////////////////////
18 // //
19 // TGLStopwatch //
20 // //
21 // Stopwatch object for timing GL work. We do not use the TStopwatch as //
22 // we need to perform GL flushing to get accurate times + we record //
23 // timing overheads here. //
24 //
25 // MT: Bypassed all of the overhead stuff. It does not seem reasonable
26 // anyway. Besides it was being initialized outside of a valid GL
27 // context and coused random crashes (especially on 64-bit machines with
28 // nvidia cards).
29 //
30 //////////////////////////////////////////////////////////////////////////
31 
32 class TGLStopwatch
33 {
34 private:
35  // Fields
36  Double_t fStart; //! start time (millisec)
37  Double_t fEnd; //! end time (millisec)
38  Double_t fLastRun; //! time of last run (milisec)
39 
40  // Methods
41  Double_t GetClock(void) const;
42 
43 public:
44  TGLStopwatch();
45  virtual ~TGLStopwatch(); // ClassDef introduces virtual fns
46 
47  void Start();
48  Double_t Lap() const;
49  Double_t End();
50  Double_t LastRun() const { return fLastRun; }
51 
52  ClassDef(TGLStopwatch,0) // a GL stopwatch utility class
53 };
54 
55 #endif // ROOT_TGLStopwatch