artvertiser/FProfiler/FTime.h

   1 /*
   2  *  FTime.h
   3  *  F
   4  *
   5  *  Created by damian on 21/03/07.
   6  *  Copyright 2007 __MyCompanyName__. All rights reserved.
   7  *
   8  */
   9
  10 #ifndef _FTIME_H
  11 #define _FTIME_H
  12
  13 /** FTime
  14
  15  implements a high resolution timer
  16
  17  can store either a high-precision relative time or a high-precision absolute time
  18
  19 */
  20
  21 #ifdef __APPLE__
  22 #define OSX
  23 #endif
  24
  25 #ifdef OSX
  26 #include <mach/mach_time.h>
  27 #else
  28 #include <time.h>
  29 #endif
  30 #include <stdio.h>
  31
  32 #include <assert.h>
  33
  34 class FTime
  35 {
  36 public:
  37         FTime() {
  38                 #ifdef OSX
  39                 time = 0;
  40                 #else
  41                 time.tv_sec = 0; time.tv_nsec = 0;
  42                 #endif
  43                  last_update_time = 0.1f; };
  44         ~FTime() { };
  45         FTime( const FTime& other ) { Copy(other); }
  46
  47         // set us to the current time
  48         void SetNow()
  49         {
  50         #ifdef OSX
  51         time = mach_absolute_time();
  52         #else
  53         // clock_gettime(CLOCK_MONOTONIC, &ts); // Works on FreeBSD
  54         clock_gettime(CLOCK_REALTIME, &time); // Works on Linux
  55         #endif
  56     }
  57
  58         // set us to the given time in seconds
  59         void SetSeconds( double seconds );
  60
  61         // update our time to the current time, returning
  62         // delta time in seconds as a float
  63         double Update();
  64
  65         // get the last delta time returned by Update()
  66         double GetLastUpdateTime() const { return last_update_time; }
  67
  68         // return milliseconds
  69         double ToMillis() const;
  70         // return seconds
  71         double ToSeconds() const { return ToMillis() / 1000.0; }
  72
  73
  74         // calculate difference
  75         FTime operator-( const FTime& other ) const
  76         {
  77         // copy self
  78         FTime t = *this;
  79         // invoke operator -=
  80         t -= other;
  81         return t;
  82         }
  83         FTime& operator -= (const FTime& other )
  84         {
  85         #ifdef OSX
  86         time -= other.time;
  87         #else
  88         //assert( false && "broken code, please fix ");
  89         if ( time.tv_nsec < other.time.tv_nsec )
  90         {
  91             // will underflow
  92
  93             //printf("underflow: %10li:%10li - %10li:%10li = ", time.tv_sec, time.tv_nsec, other.time.tv_sec, other.time.tv_nsec );
  94             time.tv_sec -= other.time.tv_sec + 1;
  95             time.tv_nsec = 1e9 - (other.time.tv_nsec-time.tv_nsec);
  96             //printf(" %10li:%10li\n", time.tv_sec, time.tv_nsec );
  97         }
  98         else
  99         {
 100             time.tv_sec -= other.time.tv_sec;
 101             time.tv_nsec -= other.time.tv_nsec;
 102         }
 103         #endif
 104         return *this;
 105         }
 106
 107         // assignment
 108         FTime& operator= (const FTime& other ) { Copy(other); return *this; }
 109
 110         // equality
 111         bool operator== (const FTime& other ) const {
 112             #ifdef OSX
 113             assert( false && "implement me" );
 114             #else
 115             return time.tv_sec == other.time.tv_sec && time.tv_nsec == other.time.tv_nsec;
 116             #endif
 117              }
 118
 119         // compare
 120         bool operator< (const FTime& other) const {
 121         #ifdef OSX
 122         assert(false&&"implement me" );
 123         return false;
 124         #else
 125         /*bool res =*/return (time.tv_sec < other.time.tv_sec) ||
 126             (time.tv_sec == other.time.tv_sec && time.tv_nsec < other.time.tv_nsec );
 127             /*
 128         printf("%f < %f: %s\n", ToSeconds(), other.ToSeconds(), res?"yes":"no");
 129         return res;*/
 130         #endif
 131         };
 132
 133 private:
 134
 135     void Copy( const FTime& other )
 136     {
 137         if ( this != &other )
 138         {
 139             time = other.time;
 140         }
 141     }
 142
 143
 144         #ifdef OSX
 145         uint64_t time;
 146         #else
 147         timespec time;
 148         #endif
 149         double last_update_time;
 150
 151 };
 152
 153 //inline bool operator< (const FTime& a, const FTime& b) { return a.operator<(b); }
 154
 155 #endif