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