147 lines
3.1 KiB
C++
147 lines
3.1 KiB
C++
// File: lzham_timer.cpp
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// See Copyright Notice and license at the end of include/lzham.h
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#include "lzham_core.h"
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#include "lzham_timer.h"
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#ifndef LZHAM_USE_WIN32_API
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#include <time.h>
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#endif
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namespace lzham
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{
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unsigned long long lzham_timer::g_init_ticks;
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unsigned long long lzham_timer::g_freq;
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double lzham_timer::g_inv_freq;
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#if LZHAM_USE_WIN32_API
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inline void query_counter(timer_ticks *pTicks)
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{
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QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(pTicks));
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}
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inline void query_counter_frequency(timer_ticks *pTicks)
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{
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QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>(pTicks));
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}
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#else
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inline void query_counter(timer_ticks *pTicks)
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{
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*pTicks = clock();
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}
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inline void query_counter_frequency(timer_ticks *pTicks)
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{
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*pTicks = CLOCKS_PER_SEC;
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}
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#endif
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lzham_timer::lzham_timer() :
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m_start_time(0),
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m_stop_time(0),
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m_started(false),
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m_stopped(false)
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{
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if (!g_inv_freq)
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init();
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}
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lzham_timer::lzham_timer(timer_ticks start_ticks)
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{
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if (!g_inv_freq)
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init();
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m_start_time = start_ticks;
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m_started = true;
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m_stopped = false;
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}
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void lzham_timer::start(timer_ticks start_ticks)
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{
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m_start_time = start_ticks;
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m_started = true;
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m_stopped = false;
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}
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void lzham_timer::start()
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{
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query_counter(&m_start_time);
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m_started = true;
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m_stopped = false;
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}
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void lzham_timer::stop()
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{
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LZHAM_ASSERT(m_started);
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query_counter(&m_stop_time);
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m_stopped = true;
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}
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double lzham_timer::get_elapsed_secs() const
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{
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LZHAM_ASSERT(m_started);
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if (!m_started)
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return 0;
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timer_ticks stop_time = m_stop_time;
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if (!m_stopped)
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query_counter(&stop_time);
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timer_ticks delta = stop_time - m_start_time;
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return delta * g_inv_freq;
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}
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timer_ticks lzham_timer::get_elapsed_us() const
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{
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LZHAM_ASSERT(m_started);
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if (!m_started)
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return 0;
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timer_ticks stop_time = m_stop_time;
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if (!m_stopped)
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query_counter(&stop_time);
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timer_ticks delta = stop_time - m_start_time;
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return (delta * 1000000ULL + (g_freq >> 1U)) / g_freq;
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}
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void lzham_timer::init()
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{
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if (!g_inv_freq)
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{
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query_counter_frequency(&g_freq);
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g_inv_freq = 1.0f / g_freq;
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query_counter(&g_init_ticks);
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}
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}
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timer_ticks lzham_timer::get_init_ticks()
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{
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if (!g_inv_freq)
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init();
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return g_init_ticks;
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}
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timer_ticks lzham_timer::get_ticks()
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{
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if (!g_inv_freq)
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init();
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timer_ticks ticks;
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query_counter(&ticks);
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return ticks - g_init_ticks;
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}
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double lzham_timer::ticks_to_secs(timer_ticks ticks)
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{
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if (!g_inv_freq)
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init();
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return ticks * g_inv_freq;
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}
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} // namespace lzham
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