artvertiser/FProfiler/FTime.cpp

   1 /*
   2  Copyright 2007, 2008, 2009, 2010 Damian Stewart <damian@frey.co.nz>.
   3  Distributed under the terms of the GNU General Public License v3.
   4
   5  This file is part of The Artvertiser.
   6
   7  The Artvertiser is free software: you can redistribute it and/or modify
   8  it under the terms of the GNU General Public License as published by
   9  the Free Software Foundation, either version 3 of the License, or
  10  (at your option) any later version.
  11
  12  The Artvertiser is distributed in the hope that it will be useful,
  13  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  GNU General Public License for more details.
  16
  17  You should have received a copy of the GNU Lesser General Public License
  18  along with The Artvertiser.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "FTime.h"
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25
  26 #ifdef OSX
  27 #else
  28 #include <time.h>
  29 #endif
  30
  31 #include <assert.h>
  32
  33 double FTime::Update()
  34 {
  35         #ifdef OSX
  36         uint64_t now = mach_absolute_time();
  37         uint64_t diff = now - time;
  38
  39         static double conversion = 0.0;
  40         if ( conversion == 0.0 )
  41         {
  42                 mach_timebase_info_data_t info;
  43                 kern_return_t err = mach_timebase_info( &info );
  44
  45                 if( err == 0 )
  46                         conversion = 1e-9*(double)info.numer / (double) info.denom;
  47         }
  48
  49         time = now;
  50         last_update_time = (float)(conversion * (double) diff);
  51
  52         #else
  53         timespec now;
  54         clock_gettime(CLOCK_REALTIME, &now);
  55
  56         // calculate diff
  57         double diff = now.tv_sec - time.tv_sec;
  58         diff += 1e-9*double(now.tv_nsec - time.tv_nsec);
  59
  60         time = now;
  61         last_update_time = diff;
  62
  63         #endif
  64         return last_update_time;
  65 }
  66
  67 void FTime::SetSeconds( double seconds )
  68 {
  69     #ifdef OSX
  70     assert( false && "implement me" );
  71     #else
  72     // truncate
  73     time.tv_sec = (long long)seconds;
  74     // nanoseconds
  75     time.tv_nsec = (seconds - (long long)seconds)*1e9;
  76     #endif
  77
  78 }
  79
  80
  81 double FTime::ToMillis() const
  82 {
  83         #ifdef OSX
  84         static double conversion = 0.0;
  85         if ( conversion == 0.0 )
  86         {
  87                 mach_timebase_info_data_t info;
  88                 kern_return_t err = mach_timebase_info( &info );
  89
  90                 if( err == 0 )
  91                         conversion = 1e-6*(double)info.numer / (double) info.denom;
  92         }
  93
  94         return (conversion * (double) time);
  95
  96         #else
  97
  98         double result = 1e3*double(time.tv_sec) + 1e-6*double(time.tv_nsec);
  99         return result;
 100
 101         #endif
 102
 103 }
 104