Function init

src/platform/linux/misc.cpp:984–1049

  }

  std::unique_ptr<deinit_t> init() {
    // enable low latency mode for AMD
    // https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30039
    set_env("AMD_DEBUG", "lowlatencyenc");

    // These are allowed to fail.
    gbm::init();

    window_system = window_system_e::NONE;
#ifdef SUNSHINE_BUILD_WAYLAND
    if (std::getenv("WAYLAND_DISPLAY")) {
      window_system = window_system_e::WAYLAND;
    }
#endif
#if defined(SUNSHINE_BUILD_X11) || defined(SUNSHINE_BUILD_CUDA)
    if (std::getenv("DISPLAY") && window_system != window_system_e::WAYLAND) {
      if (std::getenv("WAYLAND_DISPLAY")) {
        BOOST_LOG(warning) << "Wayland detected, yet sunshine will use X11 for screencasting, screencasting will only work on XWayland applications"sv;
      }

      window_system = window_system_e::X11;
    }
#endif

#ifdef SUNSHINE_BUILD_CUDA
    if ((config::video.capture.empty() && sources.none()) || config::video.capture == "nvfbc") {
      if (verify_nvfbc()) {
        sources[source::NVFBC] = true;
      }
    }
#endif
#ifdef SUNSHINE_BUILD_WAYLAND
    if ((config::video.capture.empty() && sources.none()) || config::video.capture == "wlr") {
      if (verify_wl()) {
        sources[source::WAYLAND] = true;
      }
    }
#endif
#ifdef SUNSHINE_BUILD_DRM
    if ((config::video.capture.empty() && sources.none()) || config::video.capture == "kms") {
      if (verify_kms()) {
        sources[source::KMS] = true;
      }
    }
#endif
#ifdef SUNSHINE_BUILD_X11
    // We enumerate this capture backend regardless of other suitable sources,
    // since it may be needed as a NvFBC fallback for software encoding on X11.
    if (config::video.capture.empty() || config::video.capture == "x11") {
      if (verify_x11()) {
        sources[source::X11] = true;
      }
    }
#endif

    if (sources.none()) {
      BOOST_LOG(error) << "Unable to initialize capture method"sv;
      return nullptr;