mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-27 07:01:32 +00:00
85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
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/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "os_tick_manager.hpp"
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namespace ams::os::impl {
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TimeSpan TickManager::ConvertToTimeSpan(Tick tick) const {
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/* Get the tick value. */
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const s64 tick_val = tick.GetInt64Value();
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/* Get the tick frequency. */
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const s64 tick_freq = GetTickFrequency();
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AMS_AUDIT(tick_freq < MaxTickFrequency);
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/* Clamp tick to range. */
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if (tick_val > GetMaxTick()) {
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return TimeSpan::FromNanoSeconds(std::numeric_limits<s64>::max());
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} else if (tick_val < -GetMaxTick()) {
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return TimeSpan::FromNanoSeconds(std::numeric_limits<s64>::min());
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} else {
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/* Convert to timespan. */
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constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
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const s64 seconds = tick_val / tick_freq;
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const s64 frac = tick_val % tick_freq;
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const TimeSpan ts = TimeSpan::FromSeconds(seconds) + TimeSpan::FromNanoSeconds(frac * NanoSecondsPerSecond / tick_freq);
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constexpr TimeSpan ZeroTS = TimeSpan::FromNanoSeconds(0);
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AMS_ASSERT(!((tick_val > 0 && ts < ZeroTS) || (tick_val < 0 && ts > ZeroTS)));
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return ts;
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}
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}
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Tick TickManager::ConvertToTick(TimeSpan ts) const {
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/* Get the TimeSpan in nanoseconds. */
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const s64 ns = ts.GetNanoSeconds();
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/* Clamp ns to range. */
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if (ns > GetMaxTimeSpanNs()) {
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return Tick(std::numeric_limits<s64>::max());
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} else if (ns < -GetMaxTimeSpanNs()) {
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return Tick(std::numeric_limits<s64>::min());
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} else {
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/* Get the tick frequency. */
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const s64 tick_freq = GetTickFrequency();
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AMS_AUDIT(tick_freq < MaxTickFrequency);
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/* Convert to tick. */
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constexpr s64 NanoSecondsPerSecond = TimeSpan::FromSeconds(1).GetNanoSeconds();
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const bool negative = ns < 0;
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s64 seconds = ns / NanoSecondsPerSecond;
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s64 frac = ns % NanoSecondsPerSecond;
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/* If negative, negate seconds/frac. */
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if (negative) {
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seconds = -seconds;
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frac = -frac;
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}
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/* Calculate the tick, and invert back to negative if needed. */
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s64 tick = (seconds * tick_freq) + ((frac * tick_freq + NanoSecondsPerSecond - 1) / NanoSecondsPerSecond);
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if (negative) {
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tick = -tick;
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}
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return Tick(tick);
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}
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}
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}
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