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// Copyright 2008 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Common/Timer.h"
#include <chrono>
#include <string>
#ifdef _WIN32
#include <cwchar>
#include <Windows.h>
#include <mmsystem.h>
#include <sys/timeb.h>
#else
#include <sys/time.h>
#endif
#include <fmt/chrono.h>
#include <fmt/format.h>
#include "Common/CommonTypes.h"
#include "Common/StringUtil.h"
namespace Common
{
template <typename Clock, typename Duration>
static typename Clock::rep time_now()
{
return std::chrono::time_point_cast<Duration>(Clock::now()).time_since_epoch().count();
}
template <typename Duration>
static auto steady_time_now()
{
return time_now<std::chrono::steady_clock, Duration>();
}
u64 Timer::NowUs()
{
return steady_time_now<std::chrono::microseconds>();
}
u64 Timer::NowMs()
{
return steady_time_now<std::chrono::milliseconds>();
}
void Timer::Start()
{
m_start_ms = NowMs();
m_end_ms = 0;
m_running = true;
}
void Timer::StartWithOffset(u64 offset)
{
Start();
if (m_start_ms > offset)
m_start_ms -= offset;
}
void Timer::Stop()
{
m_end_ms = NowMs();
m_running = false;
}
u64 Timer::ElapsedMs() const
{
// If we have not started yet, return zero
if (m_start_ms == 0)
return 0;
if (m_running)
{
u64 now = NowMs();
if (m_start_ms >= now)
return 0;
return now - m_start_ms;
}
else
{
if (m_start_ms >= m_end_ms)
return 0;
return m_end_ms - m_start_ms;
}
}
u64 Timer::GetLocalTimeSinceJan1970()
{
time_t sysTime, tzDiff, tzDST;
time(&sysTime);
tm* gmTime = localtime(&sysTime);
// Account for DST where needed
if (gmTime->tm_isdst == 1)
tzDST = 3600;
else
tzDST = 0;
// Lazy way to get local time in sec
gmTime = gmtime(&sysTime);
tzDiff = sysTime - mktime(gmTime);
return static_cast<u64>(sysTime + tzDiff + tzDST);
}
double Timer::GetSystemTimeAsDouble()
{
// FYI: std::chrono::system_clock epoch is not required to be 1970 until c++20.
// We will however assume time_t IS unix time.
using Clock = std::chrono::system_clock;
// TODO: Use this on switch to c++20:
// const auto since_epoch = Clock::now().time_since_epoch();
const auto unix_epoch = Clock::from_time_t({});
const auto since_epoch = Clock::now() - unix_epoch;
const auto since_double_time_epoch = since_epoch - std::chrono::seconds(DOUBLE_TIME_OFFSET);
return std::chrono::duration_cast<std::chrono::duration<double>>(since_double_time_epoch).count();
}
std::string Timer::SystemTimeAsDoubleToString(double time)
{
// revert adjustments from GetSystemTimeAsDouble() to get a normal Unix timestamp again
time_t seconds = (time_t)time + DOUBLE_TIME_OFFSET;
tm* localTime = localtime(&seconds);
#ifdef _WIN32
wchar_t tmp[32] = {};
wcsftime(tmp, std::size(tmp), L"%x %X", localTime);
return WStringToUTF8(tmp);
#else
char tmp[32] = {};
strftime(tmp, sizeof(tmp), "%x %X", localTime);
return tmp;
#endif
}
void Timer::IncreaseResolution()
{
#ifdef _WIN32
timeBeginPeriod(1);
#endif
}
void Timer::RestoreResolution()
{
#ifdef _WIN32
timeEndPeriod(1);
#endif
}
} // Namespace Common
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