Method createContext

src/SFML/Window/Win32/WglContext.cpp:695–851

///////////////////////////////////////////////////////

////////////////////////////////////////////////////////////
void WglContext::createContext(WglContext* shared)
{
    // We can't create an OpenGL context if we don't have a DC
    if (!m_deviceContext)
        return;

    // Get a working copy of the context settings
    const ContextSettings settings = m_settings;

    // Get the context to share display lists with
    HGLRC sharedContext = shared ? shared->m_context : nullptr;

    // Create the OpenGL context -- first try using wglCreateContextAttribsARB
    while (!m_context && m_settings.majorVersion)
    {
        if (SF_GLAD_WGL_ARB_create_context)
        {
            std::vector<int> attributes;

            // Check if the user requested a specific context version (anything > 1.1)
            if ((m_settings.majorVersion > 1) || ((m_settings.majorVersion == 1) && (m_settings.minorVersion > 1)))
            {
                attributes.push_back(WGL_CONTEXT_MAJOR_VERSION_ARB);
                attributes.push_back(static_cast<int>(m_settings.majorVersion));
                attributes.push_back(WGL_CONTEXT_MINOR_VERSION_ARB);
                attributes.push_back(static_cast<int>(m_settings.minorVersion));
            }

            // Check if setting the profile is supported
            if (SF_GLAD_WGL_ARB_create_context_profile)
            {
                const int profile = (m_settings.attributeFlags & ContextSettings::Core)
                                        ? WGL_CONTEXT_CORE_PROFILE_BIT_ARB
                                        : WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
                const int debug = (m_settings.attributeFlags & ContextSettings::Debug) ? WGL_CONTEXT_DEBUG_BIT_ARB : 0;

                attributes.push_back(WGL_CONTEXT_PROFILE_MASK_ARB);
                attributes.push_back(profile);
                attributes.push_back(WGL_CONTEXT_FLAGS_ARB);
                attributes.push_back(debug);
            }
            else
            {
                if ((m_settings.attributeFlags & ContextSettings::Core) ||
                    (m_settings.attributeFlags & ContextSettings::Debug))
                    err() << "Selecting a profile during context creation is not supported,"
                          << "disabling compatibility and debug" << std::endl;

                m_settings.attributeFlags = ContextSettings::Default;
            }

            // Append the terminating 0
            attributes.push_back(0);
            attributes.push_back(0);

            if (sharedContext)
            {
                static std::recursive_mutex mutex;