Method updateSettingsFromPixelFormat

src/SFML/Window/Win32/WglContext.cpp:488–606

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

////////////////////////////////////////////////////////////
void WglContext::updateSettingsFromPixelFormat()
{
    const int format = GetPixelFormat(m_deviceContext);

    if (format == 0)
    {
        err() << "Failed to get selected pixel format: " << getErrorString(GetLastError()) << std::endl;
        return;
    }

    PIXELFORMATDESCRIPTOR actualFormat;
    actualFormat.nSize    = sizeof(actualFormat);
    actualFormat.nVersion = 1;

    if (DescribePixelFormat(m_deviceContext, format, sizeof(actualFormat), &actualFormat) == 0)
    {
        err() << "Failed to retrieve pixel format information: " << getErrorString(GetLastError()) << std::endl;
        return;
    }

    // Detect if we are running using the generic GDI implementation and warn
    if (actualFormat.dwFlags & PFD_GENERIC_FORMAT)
    {
        m_isGeneric = true;

        [[maybe_unused]] static const bool hasWarnedAboutGeneric = [actualFormat]() -> bool
        {
            err() << "Warning: Detected \"Microsoft Corporation GDI Generic\" OpenGL implementation" << std::endl;

            // Detect if the generic GDI implementation is not accelerated
            if (!(actualFormat.dwFlags & PFD_GENERIC_ACCELERATED))
                err() << "Warning: The \"Microsoft Corporation GDI Generic\" OpenGL implementation is not "
                         "hardware-accelerated"
                      << std::endl;
            return true;
        }();
    }

    if (SF_GLAD_WGL_ARB_pixel_format)
    {
        static constexpr std::array attributes = {WGL_DEPTH_BITS_ARB, WGL_STENCIL_BITS_ARB};
        std::array<int, 2>          values{};

        if (wglGetPixelFormatAttribivARB(m_deviceContext,
                                         format,
                                         PFD_MAIN_PLANE,
                                         static_cast<UINT>(attributes.size()),
                                         attributes.data(),
                                         values.data()) == TRUE)
        {
            m_settings.depthBits   = static_cast<unsigned int>(values[0]);
            m_settings.stencilBits = static_cast<unsigned int>(values[1]);
        }
        else
        {
            err() << "Failed to retrieve pixel format information: " << getErrorString(GetLastError()) << std::endl;
            m_settings.depthBits   = actualFormat.cDepthBits;
            m_settings.stencilBits = actualFormat.cStencilBits;