Platform.cpp

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