include/root/TGLStopwatch.h

0001 // @(#)root/gl:$Id$
0002 // Author:  Richard Maunder  25/05/2005
0003
0004 /*************************************************************************
0005  * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers.               *
0006  * All rights reserved.                                                  *
0007  *                                                                       *
0008  * For the licensing terms see $ROOTSYS/LICENSE.                         *
0009  * For the list of contributors see $ROOTSYS/README/CREDITS.             *
0010  *************************************************************************/
0011
0012 #ifndef ROOT_TGLStopwatch
0013 #define ROOT_TGLStopwatch
0014
0015 #include "Rtypes.h"
0016
0017 //////////////////////////////////////////////////////////////////////////
0018 //                                                                      //
0019 // TGLStopwatch                                                         //
0020 //                                                                      //
0021 // Stopwatch object for timing GL work. We do not use the TStopwatch as //
0022 // we need to perform GL flushing to get accurate times + we record     //
0023 // timing overheads here.                                               //
0024 //
0025 // MT: Bypassed all of the overhead stuff. It does not seem reasonable
0026 // anyway. Besides it was being initialized outside of a valid GL
0027 // context and coused random crashes (especially on 64-bit machines with
0028 // nvidia cards).
0029 //
0030 //////////////////////////////////////////////////////////////////////////
0031
0032 class TGLStopwatch
0033 {
0034 private:
0035    // Fields
0036    Double_t        fStart;           //! start time (millisec)
0037    Double_t        fEnd;             //! end time (millisec)
0038    Double_t        fLastRun;         //! time of last run (milisec)
0039
0040    // Methods
0041    Double_t GetClock(void)      const;
0042
0043 public:
0044    TGLStopwatch();
0045    virtual ~TGLStopwatch(); // ClassDef introduces virtual fns
0046
0047    void     Start();
0048    Double_t Lap() const;
0049    Double_t End();
0050    Double_t LastRun() const { return fLastRun; }
0051
0052    ClassDef(TGLStopwatch,0) // a GL stopwatch utility class
0053 };
0054
0055 #endif // ROOT_TGLStopwatch