Method initialiseContext

RenderSystems/GL3Plus/src/OgreGL3PlusRenderSystem.cpp:3291–3343

    }

    void GL3PlusRenderSystem::initialiseContext( Window *primary )
    {
        // Set main and current context
        mMainContext = 0;
        primary->getCustomAttribute( "GLCONTEXT", &mMainContext );
        mCurrentContext = mMainContext;

        // Set primary context as active
        if( mCurrentContext )
            mCurrentContext->setCurrent();

        // Initialise GL3W
        int gl3wRetStatus = gl3wInit();
        if( gl3wRetStatus != GL3W_OK )
        {
            if( gl3wRetStatus != GL3W_ERROR_INIT )
            {
#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32 || OGRE_PLATFORM == OGRE_PLATFORM_WINRT
                const String dllName = "opengl32.dll";
#elif OGRE_PLATFORM == OGRE_PLATFORM_APPLE || OGRE_PLATFORM == OGRE_PLATFORM_APPLE_IOS
                const String dllName = "/System/Library/Frameworks/OpenGL.framework/OpenGL";
#else
                const String dllName = "libGL.so.1";
#endif
                LogManager::getSingleton().logMessage(
                    "ERROR: " + dllName + " failed to load. OpenGL not installed correctly?",
                    LML_CRITICAL );
            }

            LogManager::getSingleton().logMessage( "Failed to initialize GL3W", LML_CRITICAL );
        }
        else
        {
            // Setup GL3PlusSupport
            mGLSupport->initialiseExtensions();
        }

        // Make sure that OpenGL 3.3+ is supported in this context
        if( gl3wRetStatus != GL3W_OK || !mGLSupport->hasMinGLVersion( 3, 3 ) )
        {
            OGRE_EXCEPT( Exception::ERR_RENDERINGAPI_ERROR,
                         "OpenGL 3.3 is not supported. Please update your graphics card drivers.",
                         "GL3PlusRenderSystem::initialiseContext" );
        }

        mHasGL43 = mGLSupport->hasMinGLVersion( 4, 3 );
        mSupportsTargetIndependentRasterization =
            mHasGL43 || mGLSupport->checkExtension( "GL_ARB_framebuffer_no_attachments" );

        LogManager::getSingleton().logMessage( "**************************************" );
        LogManager::getSingleton().logMessage( "***   OpenGL 3+ Renderer Started   ***" );
        LogManager::getSingleton().logMessage( "**************************************" );
    }

    GLenum GL3PlusRenderSystem::convertCompareFunction( CompareFunction func ) const
    {