00001 00002 // 00003 // SFML - Simple and Fast Multimedia Library 00004 // Copyright (C) 2007 Laurent Gomila (laurent.gom@gmail.com) 00005 // 00006 // This software is provided 'as-is', without any express or implied warranty. 00007 // In no event will the authors be held liable for any damages arising from the use of this software. 00008 // 00009 // Permission is granted to anyone to use this software for any purpose, 00010 // including commercial applications, and to alter it and redistribute it freely, 00011 // subject to the following restrictions: 00012 // 00013 // 1. The origin of this software must not be misrepresented; 00014 // you must not claim that you wrote the original software. 00015 // If you use this software in a product, an acknowledgment 00016 // in the product documentation would be appreciated but is not required. 00017 // 00018 // 2. Altered source versions must be plainly marked as such, 00019 // and must not be misrepresented as being the original software. 00020 // 00021 // 3. This notice may not be removed or altered from any source distribution. 00022 // 00024 00026 // Headers 00028 #include <SFML/System/Win32/Platform.hpp> 00029 00030 00031 namespace sf 00032 { 00033 namespace priv 00034 { 00038 double Platform::GetSystemTime() 00039 { 00040 static LARGE_INTEGER Frequency; 00041 static BOOL UseHighPerformanceTimer = QueryPerformanceFrequency(&Frequency); 00042 00043 if (UseHighPerformanceTimer) 00044 { 00045 // High performance counter available : use it 00046 LARGE_INTEGER CurrentTime; 00047 QueryPerformanceCounter(&CurrentTime); 00048 00049 return static_cast<double>(CurrentTime.QuadPart) / Frequency.QuadPart; 00050 } 00051 else 00052 { 00053 // High performance counter not available : use GetTickCount (less accurate) 00054 return GetTickCount() * 0.001; 00055 } 00056 } 00057 00058 00062 void Platform::Sleep(float Time) 00063 { 00064 ::Sleep(static_cast<DWORD>(Time * 1000)); 00065 } 00066 00067 } // namespace priv 00068 00069 } // namespace sf