Method createSurface

src/SFML/Window/Unix/GlxContext.cpp:456–540

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void GlxContext::createSurface(GlxContext* shared, Vector2u size, unsigned int bitsPerPixel)
{
    // Choose the visual according to the context settings
    XVisualInfo visualInfo = selectBestVisual(m_display.get(), bitsPerPixel, m_settings);

    // Check if the shared context already exists and pbuffers are supported
    if (shared && SF_GLAD_GLX_SGIX_pbuffer)
    {
        // There are no GLX versions prior to 1.0
        int major = 0;
        int minor = 0;

        glXQueryVersion(m_display.get(), &major, &minor);

        // Check if glXCreatePbuffer is available (requires GLX 1.3 or greater)
        const bool hasCreatePbuffer = ((major > 1) || (minor >= 3));

        if (hasCreatePbuffer)
        {
            // Get a GLXFBConfig that matches the visual
            GLXFBConfig* config = nullptr;

            // We don't supply attributes to match against, since
            // the visual we are matching against was already
            // deemed suitable in selectBestVisual()
            int nbConfigs = 0;
            // NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays,modernize-avoid-c-arrays)
            const auto configs = X11Ptr<GLXFBConfig[]>(
                glXChooseFBConfig(m_display.get(), DefaultScreen(m_display.get()), nullptr, &nbConfigs));

            for (std::size_t i = 0; configs && (i < static_cast<std::size_t>(nbConfigs)); ++i)
            {
                const auto visual = X11Ptr<XVisualInfo>(glXGetVisualFromFBConfig(m_display.get(), configs[i]));

                if (!visual)
                    continue;

                if (visual->visualid == visualInfo.visualid)
                {
                    config = &configs[i];
                    break;
                }
            }

            if (config)
            {
                const std::array attributes =
                    {GLX_PBUFFER_WIDTH, static_cast<int>(size.x), GLX_PBUFFER_HEIGHT, static_cast<int>(size.y), 0, 0};

                m_pbuffer = glXCreatePbuffer(m_display.get(), *config, attributes.data());

                updateSettingsFromVisualInfo(&visualInfo);

                return;
            }
        }
    }