mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-09-20 15:18:59 +00:00
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
|
/*
|
||
|
|
* Copyright (c) 2018-2020 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/>.
|
||
|
|
*/
|
||
|
|
#include <stratosphere.hpp>
|
||
|
|
#include "os_tick_manager.hpp"
|
||
|
|
|
||
|
|
namespace ams::os::impl {
|
||
|
|
|
||
|
|
TimeSpan TickManager::ConvertToTimeSpan(Tick tick) const {
|
||
|
|
/* Get the tick value. */
|
||
|
|
const s64 tick_val = tick.GetInt64Value();
|
||
|
|
|
||
|
|
/* Get the tick frequency. */
|
||
|
|
const s64 tick_freq = GetTickFrequency();
|
||
|
|
AMS_AUDIT(tick_freq < MaxTickFrequency);
|
||
|
|
|
||
|
|
/* Clamp tick to range. */
|
||
|
|
if (tick_val > GetMaxTick()) {
|
||
|
|
return TimeSpan::FromNanoSeconds(std::numeric_limits<s64>::max());
|
||
|
|
} else if (tick_val < -GetMaxTick()) {
|
||
|
|
return TimeSpan::FromNanoSeconds(std::numeric_limits<s64>::min());
|
||
|
|
} else {
|
||
|
|
/* Convert to timespan. */
|
||
|
|
constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
|
||
|
|
const s64 seconds = tick_val / tick_freq;
|
||
|
|
const s64 frac = tick_val % tick_freq;
|
||
|
|
const TimeSpan ts = TimeSpan::FromSeconds(seconds) + TimeSpan::FromNanoSeconds(frac * NanoSecondsPerSecond / tick_freq);
|
||
|
|
|
||
|
|
constexpr TimeSpan ZeroTS = TimeSpan::FromNanoSeconds(0);
|
||
|
|
AMS_ASSERT(!((tick_val > 0 && ts < ZeroTS) || (tick_val < 0 && ts > ZeroTS)));
|
||
|
|
|
||
|
|
return ts;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
Tick TickManager::ConvertToTick(TimeSpan ts) const {
|
||
|
|
/* Get the TimeSpan in nanoseconds. */
|
||
|
|
const s64 ns = ts.GetNanoSeconds();
|
||
|
|
|
||
|
|
/* Clamp ns to range. */
|
||
|
|
if (ns > GetMaxTimeSpanNs()) {
|
||
|
|
return Tick(std::numeric_limits<s64>::max());
|
||
|
|
} else if (ns < -GetMaxTimeSpanNs()) {
|
||
|
|
return Tick(std::numeric_limits<s64>::min());
|
||
|
|
} else {
|
||
|
|
/* Get the tick frequency. */
|
||
|
|
const s64 tick_freq = GetTickFrequency();
|
||
|
|
AMS_AUDIT(tick_freq < MaxTickFrequency);
|
||
|
|
|
||
|
|
/* Convert to tick. */
|
||
|
|
constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
|
||
|
|
const bool negative = ns < 0;
|
||
|
|
s64 seconds = ns / NanoSecondsPerSecond;
|
||
|
|
s64 frac = ns % NanoSecondsPerSecond;
|
||
|
|
|
||
|
|
/* If negative, negate seconds/frac. */
|
||
|
|
if (negative) {
|
||
|
|
seconds = -seconds;
|
||
|
|
frac = -frac;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Calculate the tick, and invert back to negative if needed. */
|
||
|
|
s64 tick = (seconds * tick_freq) + ((frac * tick_freq + NanoSecondsPerSecond - 1) / NanoSecondsPerSecond);
|
||
|
|
if (negative) {
|
||
|
|
tick = -tick;
|
||
|
|
}
|
||
|
|
|
||
|
|
return Tick(tick);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|