Method createSurface

src/SFML/Window/Win32/WglContext.cpp:610–677

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

////////////////////////////////////////////////////////////
void WglContext::createSurface(WglContext* shared, Vector2u size, unsigned int bitsPerPixel)
{
    // Check if the shared context already exists and pbuffers are supported
    if (shared && shared->m_deviceContext && SF_GLAD_WGL_ARB_pbuffer)
    {
        const int bestFormat = selectBestPixelFormat(shared->m_deviceContext, bitsPerPixel, m_settings, true);

        if (bestFormat > 0)
        {
            static constexpr std::array attributes = {0, 0};

            m_pbuffer = wglCreatePbufferARB(shared->m_deviceContext,
                                            bestFormat,
                                            static_cast<int>(size.x),
                                            static_cast<int>(size.y),
                                            attributes.data());

            if (m_pbuffer)
            {
                m_window        = shared->m_window;
                m_deviceContext = wglGetPbufferDCARB(m_pbuffer);

                if (!m_deviceContext)
                {
                    err() << "Failed to retrieve pixel buffer device context: " << getErrorString(GetLastError())
                          << std::endl;

                    wglDestroyPbufferARB(m_pbuffer);
                    m_pbuffer = nullptr;
                }
            }
            else
            {
                err() << "Failed to create pixel buffer: " << getErrorString(GetLastError()) << std::endl;
            }
        }
    }

    // If pbuffers are not available we use a hidden window as the off-screen surface to draw to
    if (!m_deviceContext)
    {
        // We can't create a memory DC, the resulting context wouldn't be compatible
        // with other contexts and thus wglShareLists would always fail

        // Create the hidden window
        m_window = CreateWindowA("STATIC",
                                 "",
                                 WS_POPUP | WS_DISABLED,
                                 0,
                                 0,
                                 static_cast<int>(size.x),
                                 static_cast<int>(size.y),
                                 nullptr,
                                 nullptr,
                                 GetModuleHandle(nullptr),
                                 nullptr);
        ShowWindow(m_window, SW_HIDE);
        m_deviceContext = GetDC(m_window);