Add a secondary headless backend

This allows the create_output command to work on DRM too.

2 files changed, 10 insertions, 1 deletions

diff --git a/include/sway/server.h b/include/sway/server.h
index a9ffe187..3c972bc5 100644
--- a/include/sway/server.h
+++ b/include/sway/server.h
@@ -29,6 +29,8 @@ struct sway_server {
 
         struct wlr_backend *backend;
         struct wlr_backend *noop_backend;
+        // secondary headless backend used for creating virtual outputs on-the-fly
+        struct wlr_backend *headless_backend;
 
         struct wlr_compositor *compositor;
         struct wl_listener compositor_new_surface;
diff --git a/sway/server.c b/sway/server.c
index 3f658598..ec30430c 100644
--- a/sway/server.c
+++ b/sway/server.c
@@ -4,6 +4,8 @@
 #include <stdlib.h>
 #include <wayland-server-core.h>
 #include <wlr/backend.h>
+#include <wlr/backend/headless.h>
+#include <wlr/backend/multi.h>
 #include <wlr/backend/noop.h>
 #include <wlr/backend/session.h>
 #include <wlr/render/wlr_renderer.h>
@@ -41,7 +43,6 @@ bool server_privileged_prepare(struct sway_server *server) {
         server->wl_display = wl_display_create();
         server->wl_event_loop = wl_display_get_event_loop(server->wl_display);
         server->backend = wlr_backend_autocreate(server->wl_display, NULL);
-        server->noop_backend = wlr_noop_backend_create(server->wl_display);
 
         if (!server->backend) {
                 sway_log(SWAY_ERROR, "Unable to create backend");
@@ -153,9 +154,15 @@ bool server_init(struct sway_server *server) {
                 return false;
         }
 
+        server->noop_backend = wlr_noop_backend_create(server->wl_display);
+
         struct wlr_output *wlr_output = wlr_noop_add_output(server->noop_backend);
         root->noop_output = output_create(wlr_output);
 
+        server->headless_backend =
+                wlr_headless_backend_create_with_renderer(server->wl_display, renderer);
+        wlr_multi_backend_add(server->backend, server->headless_backend);
+
         // This may have been set already via -Dtxn-timeout
         if (!server->txn_timeout_ms) {
                 server->txn_timeout_ms = 200;