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Timer.h

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/*
    File:           Timer.h

    Function:       Provides routines for timing under several different 
                    architectures. You must define one of the following:
                
                        UNIX_TIME       Use the time() and times() calls
                        ANSI_TIME       Use the ansi clock() routine
                        SGI_TIME        Use the SGI multimedia timing 
                                        routines (nano-second accuracy.)
                        RUSAGE_TIME     Use getrusage() system call 
        
    Author(s):      Andrew Willmott

    Copyright:      (c) 1995-2000, Andrew Willmott
 */

#ifndef __Timer__
#define __Timer__

#include "cl/Basics.h"

// Account for the morons who coded X11
#ifdef CurrentTime
#undef CurrentTime
#endif

class Timer
// all times in seconds. 
{
public:
    Timer() : startTime(0.0), stopTime(0.0), lapTime(0.0)
    {};

    Void    StartTimer();   // Starts timer
    Void    StopTimer();    // Stops timer
    Void    ContTimer();    // Continue timer
    Float   GetTimer();     // Returns time since timer was started

    Float   DeltaTime();    // returns time delta since DeltaTime
                            // or StartTimer was last called

    virtual Float   CurrentTime() = 0;

protected:
    Float   startTime;
    Float   stopTime;
    Float   lapTime;
};

class ProgramTimer : public Timer
// measures elapsed program time.
{
public:
    ProgramTimer() : Timer(), addSystem(false)
    {};
    
    Float   CurrentTime();

    Bool    addSystem;
};

class WallClockTimer : public Timer
// measures wall clock time.
{
public:
    Float   CurrentTime();
};

#endif

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