63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
// Copyright (C) 2023 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
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// This file is part of the "Nazara Engine - Core module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Core/Win32/TimeImpl.hpp>
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#include <Nazara/Core/Error.hpp>
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#include <ctime>
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#include <Windows.h>
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#include <Nazara/Core/Debug.hpp>
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namespace Nz
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{
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namespace NAZARA_ANONYMOUS_NAMESPACE
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{
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LARGE_INTEGER s_frequency; // The frequency of the performance counter is fixed at system boot and is consistent across all processors
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}
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bool InitializeHighPrecisionTimer()
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{
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NAZARA_USE_ANONYMOUS_NAMESPACE
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return QueryPerformanceFrequency(&s_frequency) != 0 && s_frequency.QuadPart != 0;
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}
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Time GetElapsedNanosecondsImpl()
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{
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NAZARA_USE_ANONYMOUS_NAMESPACE
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LARGE_INTEGER time;
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QueryPerformanceCounter(&time);
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if (s_frequency.QuadPart == 10'000'000) //< seems to be a common value
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return Time::Nanoseconds(100ll * time.QuadPart);
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else
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{
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// Compute using 128bits precisions
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// https://stackoverflow.com/questions/23378063/how-can-i-use-mach-absolute-time-without-overflowing
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UInt64 num = 1'000'000'000ll;
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UInt64 denom = s_frequency.QuadPart;
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UInt64 value = time.QuadPart;
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UInt64 high = (value >> 32) * num;
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UInt64 low = (value & 0xFFFFFFFFull) * num / denom;
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UInt64 highRem = ((high % denom) << 32) / denom;
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high /= denom;
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return Time::Nanoseconds(SafeCast<Int64>((high << 32) + highRem + low));
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}
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}
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Time GetElapsedMillisecondsImpl()
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{
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#ifdef NAZARA_UTILS_WINDOWS_NT6
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return Time::Milliseconds(GetTickCount64());
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#else
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return Time::Milliseconds(GetTickCount());
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#endif
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}
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}
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#include <Nazara/Core/AntiWindows.hpp>
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