boilerplate for wl_output

wayland.c

@@ -162,6 +162,40 @@ void egl_init_surface(struct client_state *state, struct surface *surface) {
     }
 }
 
+static void wl_output_name(void *data, struct wl_output *wl_output, const char *name) {
+    printf("output name: %s\n", name);
+}
+
+static void wl_output_description(void *data, struct wl_output *wl_output, const char *description) {
+}
+static void wl_output_done(void *data, struct wl_output *wl_output) {
+}
+static void wl_output_geometry(
+        void *data, struct wl_output *wl_output,
+        int x,
+        int y,
+        int physical_width,
+        int physical_height,
+        int subpixel,
+        const char *make,
+        const char *model,
+        int transform
+        ) {
+}
+static void wl_output_mode(void *data, struct wl_output *wl_output, unsigned int mode, int width, int height, int refresh) {
+}
+static void wl_output_scale(void *data, struct wl_output *wl_output, int factor) {
+}
+
+static const struct wl_output_listener wl_output_listener = {
+    .description = wl_output_description,
+    .done = wl_output_done,
+    .geometry = wl_output_geometry,
+    .mode = wl_output_mode,
+    .name = wl_output_name,
+    .scale = wl_output_scale,
+};
+
 static void wl_buffer_release(void *data, struct wl_buffer *wl_buffer) {
     /* Sent by the compositor when it's no longer using this buffer */
     wl_buffer_destroy(wl_buffer);
@@ -452,6 +486,7 @@ static void registry_handle_global(
     if (strcmp(interface, wl_output_interface.name) == 0 && state->output_type == OUTPUT_LAYER) {
         struct wl_output *wl_output = wl_registry_bind(
                 registry, name, &wl_output_interface, 4);
+        wl_output_add_listener(wl_output, &wl_output_listener, state);
         layer_new(state, wl_output);
     }
 }