Don't advertise the noop output

 include/render.c |  4 ++++
 include/render.h |  1 +
 src/output.zig   | 22 ++++++++++++----------
 3 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/include/render.c b/include/render.c
index 87f1f50..0eaf76d 100644
--- a/include/render.c
+++ b/include/render.c
@@ -31,3 +31,7 @@ struct wlr_backend *river_wlr_noop_backend_create(struct wl_display *display) {
 struct wlr_output *river_wlr_noop_add_output(struct wlr_backend *backend) {
     return wlr_noop_add_output(backend);
 }
+
+bool river_wlr_output_is_noop(struct wlr_output *output) {
+    return wlr_output_is_noop(output);
+}
diff --git a/include/render.h b/include/render.h
index 5d75d3d..2da8f6e 100644
--- a/include/render.h
+++ b/include/render.h
@@ -29,5 +29,6 @@ bool river_wlr_backend_is_multi(struct wlr_backend *backend);
 struct wlr_session *river_wlr_backend_get_session(struct wlr_backend *backend);
 struct wlr_backend *river_wlr_noop_backend_create(struct wl_display *display);
 struct wlr_output *river_wlr_noop_add_output(struct wlr_backend *backend);
+bool river_wlr_output_is_noop(struct wlr_output *output);
 
 #endif
diff --git a/src/output.zig b/src/output.zig
index 23e9e88..a31d7fc 100644
--- a/src/output.zig
+++ b/src/output.zig
@@ -86,16 +86,18 @@ pub const Output = struct {
         self.listen_mode.notify = handleMode;
         c.wl_signal_add(&wlr_output.events.mode, &self.listen_mode);
 
-        // Add the new output to the layout. The add_auto function arranges outputs
-        // from left-to-right in the order they appear. A more sophisticated
-        // compositor would let the user configure the arrangement of outputs in the
-        // layout.
-        c.wlr_output_layout_add_auto(root.wlr_output_layout, wlr_output);
-
-        // Creating the global adds a wl_output global to the display, which Wayland
-        // clients can see to find out information about the output (such as
-        // DPI, scale factor, manufacturer, etc).
-        c.wlr_output_create_global(wlr_output);
+        if (!c.river_wlr_output_is_noop(wlr_output)) {
+            // Add the new output to the layout. The add_auto function arranges outputs
+            // from left-to-right in the order they appear. A more sophisticated
+            // compositor would let the user configure the arrangement of outputs in the
+            // layout.
+            c.wlr_output_layout_add_auto(root.wlr_output_layout, wlr_output);
+
+            // Creating the global adds a wl_output global to the display, which Wayland
+            // clients can see to find out information about the output (such as
+            // DPI, scale factor, manufacturer, etc).
+            c.wlr_output_create_global(wlr_output);
+        }
     }
 
     /// Add a new view to the output. arrangeViews() will be called by the view