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When the linux-dmabuf protocol is available, prefer it over the old wl_drm protocol. Previously wl_drm was used when modifiers aren't supported, however linux-dmabuf supports formats without modifiers too. In this case, linux-dmabuf will send a DRM_FORMAT_MOD_INVALID modifier for each supported format [1]. This allows compositors to better handle these buffers, getting a DMA-BUF and implementing features like direct scan-out. A similar logic has been implemented for EGL [2]. DRM_FORMAT_MOD_INVALID is now stored in the xwl_screen->formats list. glamor_get_modifiers still returns FALSE with zero modifiers if the only advertised modifier is DRM_FORMAT_MOD_INVALID. [1]:fb9b2a8731[2]:c376865f5eSigned-off-by: Simon Ser <contact@emersion.fr> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>