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libsfml  1.6+dfsg2
GraphicsContext.cpp
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00001 
00002 //
00003 // SFML - Simple and Fast Multimedia Library
00004 // Copyright (C) 2007-2009 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/Graphics/GraphicsContext.hpp>
00029 #include <SFML/Window/Context.hpp>
00030 
00031 
00032 namespace
00033 {
00035     // One time initialization of 3rd party libraries.
00036     // We use a global function with a static boolean rather
00037     // than directly a global boolean, to avoid the randomness
00038     // of global variables initializations across compile units.
00040     void InitGraphicsLibs()
00041     {
00042         static bool InitDone = false;
00043         if (!InitDone)
00044         {
00045             // Initialize GLEW
00046             glewInit();
00047 
00048             InitDone = true;
00049         }
00050     }
00051 
00052 }
00053 
00054 
00055 namespace sf
00056 {
00057 namespace priv
00058 {
00063 GraphicsContext::GraphicsContext()
00064 {
00065     // Activate the global context
00066     if (!Context::IsContextActive())
00067     {
00068         Context::GetGlobal().SetActive(true);
00069         myActivated = true;
00070     }
00071     else
00072     {
00073         myActivated = false;
00074     }
00075 
00076     // Make sure third party libraries are initialized
00077     InitGraphicsLibs();
00078 }
00079 
00080 
00085 GraphicsContext::~GraphicsContext()
00086 {
00087     // Deactivate the global context
00088     if (myActivated)
00089         Context::GetGlobal().SetActive(false);
00090 }
00091 
00092 } // namespace priv
00093 
00094 } // namespace sf