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_private
00032 {
00036 double sfPlatform::GetSystemTime()
00037 {
00038     static LARGE_INTEGER Frequency;
00039     static BOOL          UseHighPerformanceTimer = QueryPerformanceFrequency(&Frequency);
00040 
00041     if (UseHighPerformanceTimer)
00042     {
00043         // High performance counter available : use it
00044         LARGE_INTEGER CurrentTime;
00045         QueryPerformanceCounter(&CurrentTime);
00046 
00047         return static_cast<double>(CurrentTime.QuadPart) / Frequency.QuadPart;
00048     }
00049     else
00050     {
00051         // High performance counter not available : use GetTickCount (less accurate)
00052         return GetTickCount() * 0.001;
00053     }
00054 }
00055 
00056 
00060 void sfPlatform::Sleep(float Time)
00061 {
00062     ::Sleep(static_cast<DWORD>(Time * 1000));
00063 }
00064 
00065 } // namespace sf_private