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Atmosphere/libraries/libvapours/include/vapours/svc/svc_tick.hpp
2021-10-09 16:14:00 -07:00

72 lines
3.1 KiB
C++

/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <vapours/svc/svc_common.hpp>
#include <vapours/svc/svc_select_hardware_constants.hpp>
namespace ams::svc {
class Tick {
public:
static constexpr s64 TicksPerSecond = ::ams::svc::TicksPerSecond;
static constexpr s64 GetTicksPerSecond() { return TicksPerSecond; }
private:
s64 m_tick;
private:
static constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
static constexpr void DivNs(s64 &out, const s64 value) {
out = value / NanoSecondsPerSecond;
}
static constexpr void DivModNs(s64 &out_div, s64 &out_mod, const s64 value) {
out_div = value / NanoSecondsPerSecond;
out_mod = value % NanoSecondsPerSecond;
}
static constexpr s64 ConvertTimeSpanToTickImpl(TimeSpan ts) {
/* Split up timespan and ticks-per-second by ns. */
s64 ts_div = 0, ts_mod = 0;
s64 tick_div = 0, tick_mod = 0;
DivModNs(ts_div, ts_mod, ts.GetNanoSeconds());
DivModNs(tick_div, tick_mod, TicksPerSecond);
/* Convert the timespan into a tick count. */
s64 value = 0;
DivNs(value, ts_mod * tick_mod + NanoSecondsPerSecond - 1);
return (ts_div * tick_div) * NanoSecondsPerSecond + ts_div * tick_mod + ts_mod * tick_div + value;
}
public:
constexpr explicit Tick(s64 t = 0) : m_tick(t) { /* ... */ }
constexpr Tick(TimeSpan ts) : m_tick(ConvertTimeSpanToTickImpl(ts)) { /* ... */ }
constexpr operator s64() const { return m_tick; }
/* Tick arithmetic. */
constexpr Tick &operator+=(Tick rhs) { m_tick += rhs.m_tick; return *this; }
constexpr Tick &operator-=(Tick rhs) { m_tick -= rhs.m_tick; return *this; }
constexpr Tick operator+(Tick rhs) const { Tick r(*this); return r += rhs; }
constexpr Tick operator-(Tick rhs) const { Tick r(*this); return r -= rhs; }
constexpr Tick &operator+=(TimeSpan rhs) { m_tick += Tick(rhs).m_tick; return *this; }
constexpr Tick &operator-=(TimeSpan rhs) { m_tick -= Tick(rhs).m_tick; return *this; }
constexpr Tick operator+(TimeSpan rhs) const { Tick r(*this); return r += rhs; }
constexpr Tick operator-(TimeSpan rhs) const { Tick r(*this); return r -= rhs; }
};
}