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| 1 | +// File: timer.cpp - Simple high-precision timer class. Supports Win32, X360, and POSIX/Linux |
| 2 | +#include <stdlib.h> |
| 3 | +#include <stdio.h> |
| 4 | +#include <assert.h> |
| 5 | +#include <time.h> |
| 6 | + |
| 7 | +#include "timer.h" |
| 8 | + |
| 9 | +#if defined(WIN32) |
| 10 | +#include <windows.h> |
| 11 | +#elif defined(_XBOX) |
| 12 | +#include <xtl.h> |
| 13 | +#endif |
| 14 | + |
| 15 | +unsigned long long timer::g_init_ticks; |
| 16 | +unsigned long long timer::g_freq; |
| 17 | +double timer::g_inv_freq; |
| 18 | + |
| 19 | +#if defined(WIN32) || defined(_XBOX) |
| 20 | +inline void query_counter(timer_ticks *pTicks) |
| 21 | +{ |
| 22 | + QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(pTicks)); |
| 23 | +} |
| 24 | +inline void query_counter_frequency(timer_ticks *pTicks) |
| 25 | +{ |
| 26 | + QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>(pTicks)); |
| 27 | +} |
| 28 | +#elif defined(__GNUC__) |
| 29 | +#include <sys/timex.h> |
| 30 | +inline void query_counter(timer_ticks *pTicks) |
| 31 | +{ |
| 32 | + struct timeval cur_time; |
| 33 | + gettimeofday(&cur_time, NULL); |
| 34 | + *pTicks = static_cast<unsigned long long>(cur_time.tv_sec)*1000000ULL + static_cast<unsigned long long>(cur_time.tv_usec); |
| 35 | +} |
| 36 | +inline void query_counter_frequency(timer_ticks *pTicks) |
| 37 | +{ |
| 38 | + *pTicks = 1000000; |
| 39 | +} |
| 40 | +#endif |
| 41 | + |
| 42 | +timer::timer() : |
| 43 | + m_start_time(0), |
| 44 | + m_stop_time(0), |
| 45 | + m_started(false), |
| 46 | + m_stopped(false) |
| 47 | +{ |
| 48 | + if (!g_inv_freq) |
| 49 | + init(); |
| 50 | +} |
| 51 | + |
| 52 | +timer::timer(timer_ticks start_ticks) |
| 53 | +{ |
| 54 | + if (!g_inv_freq) |
| 55 | + init(); |
| 56 | + |
| 57 | + m_start_time = start_ticks; |
| 58 | + |
| 59 | + m_started = true; |
| 60 | + m_stopped = false; |
| 61 | +} |
| 62 | + |
| 63 | +void timer::start(timer_ticks start_ticks) |
| 64 | +{ |
| 65 | + m_start_time = start_ticks; |
| 66 | + |
| 67 | + m_started = true; |
| 68 | + m_stopped = false; |
| 69 | +} |
| 70 | + |
| 71 | +void timer::start() |
| 72 | +{ |
| 73 | + query_counter(&m_start_time); |
| 74 | + |
| 75 | + m_started = true; |
| 76 | + m_stopped = false; |
| 77 | +} |
| 78 | + |
| 79 | +void timer::stop() |
| 80 | +{ |
| 81 | + assert(m_started); |
| 82 | + |
| 83 | + query_counter(&m_stop_time); |
| 84 | + |
| 85 | + m_stopped = true; |
| 86 | +} |
| 87 | + |
| 88 | +double timer::get_elapsed_secs() const |
| 89 | +{ |
| 90 | + assert(m_started); |
| 91 | + if (!m_started) |
| 92 | + return 0; |
| 93 | + |
| 94 | + timer_ticks stop_time = m_stop_time; |
| 95 | + if (!m_stopped) |
| 96 | + query_counter(&stop_time); |
| 97 | + |
| 98 | + timer_ticks delta = stop_time - m_start_time; |
| 99 | + return delta * g_inv_freq; |
| 100 | +} |
| 101 | + |
| 102 | +timer_ticks timer::get_elapsed_us() const |
| 103 | +{ |
| 104 | + assert(m_started); |
| 105 | + if (!m_started) |
| 106 | + return 0; |
| 107 | + |
| 108 | + timer_ticks stop_time = m_stop_time; |
| 109 | + if (!m_stopped) |
| 110 | + query_counter(&stop_time); |
| 111 | + |
| 112 | + timer_ticks delta = stop_time - m_start_time; |
| 113 | + return (delta * 1000000ULL + (g_freq >> 1U)) / g_freq; |
| 114 | +} |
| 115 | + |
| 116 | +void timer::init() |
| 117 | +{ |
| 118 | + if (!g_inv_freq) |
| 119 | + { |
| 120 | + query_counter_frequency(&g_freq); |
| 121 | + g_inv_freq = 1.0f / g_freq; |
| 122 | + |
| 123 | + query_counter(&g_init_ticks); |
| 124 | + } |
| 125 | +} |
| 126 | + |
| 127 | +timer_ticks timer::get_init_ticks() |
| 128 | +{ |
| 129 | + if (!g_inv_freq) |
| 130 | + init(); |
| 131 | + |
| 132 | + return g_init_ticks; |
| 133 | +} |
| 134 | + |
| 135 | +timer_ticks timer::get_ticks() |
| 136 | +{ |
| 137 | + if (!g_inv_freq) |
| 138 | + init(); |
| 139 | + |
| 140 | + timer_ticks ticks; |
| 141 | + query_counter(&ticks); |
| 142 | + return ticks - g_init_ticks; |
| 143 | +} |
| 144 | + |
| 145 | +double timer::ticks_to_secs(timer_ticks ticks) |
| 146 | +{ |
| 147 | + if (!g_inv_freq) |
| 148 | + init(); |
| 149 | + |
| 150 | + return ticks * g_inv_freq; |
| 151 | +} |
| 152 | + |
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