Method selectBestVisual

src/SFML/Window/EglContext.cpp:371–412

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

#if defined(SFML_SYSTEM_LINUX) && !defined(SFML_USE_DRM)
////////////////////////////////////////////////////////////
XVisualInfo EglContext::selectBestVisual(::Display* xDisplay, unsigned int bitsPerPixel, const ContextSettings& settings)
{
    EglContextImpl::ensureInit();

    // Get the initialized EGL display
    EGLDisplay display = EglContextImpl::getInitializedDisplay();

    // Get the best EGL config matching the default video settings
    EGLConfig config = getBestConfig(display, bitsPerPixel, settings);

    // Retrieve the visual id associated with this EGL config
    EGLint nativeVisualId = 0;

    eglCheck(eglGetConfigAttrib(display, config, EGL_NATIVE_VISUAL_ID, &nativeVisualId));

    if (nativeVisualId == 0)
    {
        // Should never happen...
        err() << "No EGL visual found. You should check your graphics driver" << std::endl;

        return {};
    }

    XVisualInfo vTemplate;
    vTemplate.visualid = static_cast<VisualID>(nativeVisualId);

    // Get X11 visuals compatible with this EGL config
    int visualCount = 0;
    // NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays,modernize-avoid-c-arrays)
    const auto availableVisuals = X11Ptr<XVisualInfo[]>(XGetVisualInfo(xDisplay, VisualIDMask, &vTemplate, &visualCount));

    if (visualCount == 0)
    {
        // Can't happen...
        err() << "No X11 visual found. Bug in your EGL implementation ?" << std::endl;

        return {};
    }

    // Pick up the best one
    return availableVisuals[0];
}
#endif

} // namespace sf::priv