xwayland: Add initial support

src/backend/kms/mod.rs

@@ -301,6 +301,9 @@ pub fn init_backend(
         devices: HashMap::new(),
     });
 
+    // TODO: Do multiple Xwaylands for better multigpu
+    state.launch_xwayland(Some(primary));
+
     for (dev, path) in udev_dispatcher.as_source_ref().device_list() {
         state
             .device_added(dev, path.into(), dh)

src/backend/kms/socket.rs

@@ -11,6 +11,7 @@ use smithay::{
         wayland_server::{backend::GlobalId, Client, DisplayHandle},
     },
     wayland::{dmabuf::DmabufGlobal, socket::ListeningSocketSource},
+    xwayland::XWaylandClientData,
 };
 use std::sync::Arc;
 
@@ -46,8 +47,15 @@ impl State {
 
         // initialize globals
         let filter = move |client: &Client| {
-            let dev_id = client.get_data::<ClientState>().unwrap().drm_node.unwrap();
-            dev_id == render_node
+            if let Some(normal_client) = client.get_data::<ClientState>() {
+                let dev_id = normal_client.drm_node.unwrap();
+                return dev_id == render_node;
+            }
+            if let Some(xwayland_client) = client.get_data::<XWaylandClientData>() {
+                let dev_id = xwayland_client.user_data().get::<DrmNode>().unwrap();
+                return *dev_id == render_node;
+            }
+            false
         };
 
         let dmabuf_global = self

src/backend/winit.rs

@@ -241,6 +241,7 @@ pub fn init_backend(
         #[cfg(feature = "debug")]
         fps,
     });
+
     state
         .common
         .output_configuration_state
@@ -255,6 +256,8 @@ pub fn init_backend(
         &state.common.event_loop_handle,
     );
 
+    state.launch_xwayland(None);
+
     Ok(())
 }
 

src/backend/x11.rs

@@ -305,6 +305,8 @@ pub fn init_backend(
         &state.common.event_loop_handle,
     );
 
+    state.launch_xwayland(None);
+
     event_loop
         .handle()
         .insert_source(backend, move |event, _, data| match event {