86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/wall_clock.h"
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#ifdef ARCHITECTURE_x86_64
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#include "common/x64/cpu_detect.h"
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#include "common/x64/native_clock.h"
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#endif
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namespace Common {
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using base_timer = std::chrono::steady_clock;
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using base_time_point = std::chrono::time_point<base_timer>;
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class StandardWallClock final : public WallClock {
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public:
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explicit StandardWallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_)
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: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, false) {
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start_time = base_timer::now();
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}
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std::chrono::nanoseconds GetTimeNS() override {
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base_time_point current = base_timer::now();
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auto elapsed = current - start_time;
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return std::chrono::duration_cast<std::chrono::nanoseconds>(elapsed);
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}
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std::chrono::microseconds GetTimeUS() override {
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base_time_point current = base_timer::now();
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auto elapsed = current - start_time;
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return std::chrono::duration_cast<std::chrono::microseconds>(elapsed);
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}
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std::chrono::milliseconds GetTimeMS() override {
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base_time_point current = base_timer::now();
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auto elapsed = current - start_time;
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return std::chrono::duration_cast<std::chrono::milliseconds>(elapsed);
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}
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u64 GetClockCycles() override {
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return GetTimeNS().count() * (emulated_clock_frequency / 1000) / 1000000;
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}
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u64 GetCPUCycles() override {
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return GetTimeNS().count() * (emulated_cpu_frequency / 1000) / 1000000;
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}
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void Pause([[maybe_unused]] bool is_paused) override {
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// Do nothing in this clock type.
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}
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private:
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base_time_point start_time;
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};
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#ifdef ARCHITECTURE_x86_64
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std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
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u32 emulated_clock_frequency) {
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const auto& caps = GetCPUCaps();
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u64 rtsc_frequency = 0;
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if (caps.invariant_tsc) {
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rtsc_frequency = EstimateRDTSCFrequency();
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}
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if (rtsc_frequency == 0) {
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return std::make_unique<StandardWallClock>(emulated_cpu_frequency,
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emulated_clock_frequency);
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} else {
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return std::make_unique<X64::NativeClock>(emulated_cpu_frequency, emulated_clock_frequency,
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rtsc_frequency);
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}
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}
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#else
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std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
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u32 emulated_clock_frequency) {
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return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency);
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}
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#endif
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} // namespace Common
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