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bb4e676155
We are providing a conversion to nanoseconds in NativeClock, which is more precise than the GPU tick.
77 lines
2.1 KiB
C++
77 lines
2.1 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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#include "common/steady_clock.h"
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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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#include "common/x64/rdtsc.h"
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#endif
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namespace Common {
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class StandardWallClock final : public WallClock {
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public:
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explicit StandardWallClock() : start_time{SteadyClock::Now()} {}
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std::chrono::nanoseconds GetTimeNS() const override {
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return SteadyClock::Now() - start_time;
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}
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std::chrono::microseconds GetTimeUS() const override {
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return static_cast<std::chrono::microseconds>(GetHostTicksElapsed() / NsToUsRatio::den);
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}
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std::chrono::milliseconds GetTimeMS() const override {
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return static_cast<std::chrono::milliseconds>(GetHostTicksElapsed() / NsToMsRatio::den);
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}
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u64 GetCNTPCT() const override {
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return GetHostTicksElapsed() * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
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}
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u64 GetGPUTick() const override {
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return GetHostTicksElapsed() * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
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}
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u64 GetHostTicksNow() const override {
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return static_cast<u64>(SteadyClock::Now().time_since_epoch().count());
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}
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u64 GetHostTicksElapsed() const override {
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return static_cast<u64>(GetTimeNS().count());
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}
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bool IsNative() const override {
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return false;
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}
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private:
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SteadyClock::time_point start_time;
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};
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std::unique_ptr<WallClock> CreateOptimalClock() {
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#ifdef ARCHITECTURE_x86_64
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const auto& caps = GetCPUCaps();
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if (caps.invariant_tsc && caps.tsc_frequency >= std::nano::den) {
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return std::make_unique<X64::NativeClock>(caps.tsc_frequency);
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} else {
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// Fallback to StandardWallClock if the hardware TSC
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// - Is not invariant
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// - Is not more precise than 1 GHz (1ns resolution)
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return std::make_unique<StandardWallClock>();
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}
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#else
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return std::make_unique<StandardWallClock>();
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#endif
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}
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std::unique_ptr<WallClock> CreateStandardWallClock() {
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return std::make_unique<StandardWallClock>();
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}
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} // namespace Common
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