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92 lines
3 KiB
C++
92 lines
3 KiB
C++
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <chrono>
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#include <memory>
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#include <ratio>
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#include "common/common_types.h"
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namespace Common {
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class WallClock {
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public:
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static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz
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static constexpr u64 GPUTickFreq = 614'400'000; // GM20B GPU Tick Frequency = 614.4 MHz
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static constexpr u64 CPUTickFreq = 1'020'000'000; // T210/4 A57 CPU Tick Frequency = 1020.0 MHz
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virtual ~WallClock() = default;
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/// @returns The time in nanoseconds since the construction of this clock.
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virtual std::chrono::nanoseconds GetTimeNS() const = 0;
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/// @returns The time in microseconds since the construction of this clock.
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virtual std::chrono::microseconds GetTimeUS() const = 0;
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/// @returns The time in milliseconds since the construction of this clock.
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virtual std::chrono::milliseconds GetTimeMS() const = 0;
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/// @returns The guest CNTPCT ticks since the construction of this clock.
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virtual s64 GetCNTPCT() const = 0;
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/// @returns The guest GPU ticks since the construction of this clock.
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virtual s64 GetGPUTick() const = 0;
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/// @returns The raw host timer ticks since an indeterminate epoch.
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virtual s64 GetUptime() const = 0;
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/// @returns Whether the clock directly uses the host's hardware clock.
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virtual bool IsNative() const = 0;
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static inline u64 NSToCNTPCT(u64 ns) {
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return ns * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
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}
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static inline u64 NSToGPUTick(u64 ns) {
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return ns * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
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}
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// Cycle Timing
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static inline u64 CPUTickToNS(u64 cpu_tick) {
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return cpu_tick * CPUTickToNsRatio::num / CPUTickToNsRatio::den;
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}
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static inline u64 CPUTickToUS(u64 cpu_tick) {
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return cpu_tick * CPUTickToUsRatio::num / CPUTickToUsRatio::den;
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}
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static inline u64 CPUTickToCNTPCT(u64 cpu_tick) {
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return cpu_tick * CPUTickToCNTPCTRatio::num / CPUTickToCNTPCTRatio::den;
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}
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static inline u64 CPUTickToGPUTick(u64 cpu_tick) {
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return cpu_tick * CPUTickToGPUTickRatio::num / CPUTickToGPUTickRatio::den;
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}
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protected:
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using NsRatio = std::nano;
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using UsRatio = std::micro;
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using MsRatio = std::milli;
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using NsToUsRatio = std::ratio_divide<std::nano, std::micro>;
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using NsToMsRatio = std::ratio_divide<std::nano, std::milli>;
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using NsToCNTPCTRatio = std::ratio<CNTFRQ, std::nano::den>;
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using NsToGPUTickRatio = std::ratio<GPUTickFreq, std::nano::den>;
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// Cycle Timing
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using CPUTickToNsRatio = std::ratio<std::nano::den, CPUTickFreq>;
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using CPUTickToUsRatio = std::ratio<std::micro::den, CPUTickFreq>;
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using CPUTickToCNTPCTRatio = std::ratio<CNTFRQ, CPUTickFreq>;
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using CPUTickToGPUTickRatio = std::ratio<GPUTickFreq, CPUTickFreq>;
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};
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std::unique_ptr<WallClock> CreateOptimalClock();
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std::unique_ptr<WallClock> CreateStandardWallClock();
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} // namespace Common
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