Add initial layer shell skeleton

cage.c

@@ -1,7 +1,7 @@
 /*
  * Cage: A Wayland kiosk.
  *
- * Copyright (C) 2018-2020 Jente Hidskes
+ * Copyright (C) 2018-2021 Jente Hidskes
  *
  * See the LICENSE file accompanying this file.
  */
@@ -27,6 +27,7 @@
 #include <wlr/types/wlr_gamma_control_v1.h>
 #include <wlr/types/wlr_idle_inhibit_v1.h>
 #include <wlr/types/wlr_idle_notify_v1.h>
+#include <wlr/types/wlr_layer_shell_v1.h>
 #include <wlr/types/wlr_output_layout.h>
 #include <wlr/types/wlr_output_management_v1.h>
 #include <wlr/types/wlr_presentation_time.h>
@@ -52,6 +53,7 @@
 #endif
 
 #include "idle_inhibit_v1.h"
+#include "layer_shell_v1.h"
 #include "output.h"
 #include "seat.h"
 #include "server.h"
@@ -461,6 +463,15 @@ main(int argc, char *argv[])
 		goto end;
 	}
 
+	server.layer_shell_v1 = wlr_layer_shell_v1_create(server.wl_display, 4);
+	if (!server.layer_shell_v1) {
+		wlr_log(WLR_ERROR, "Unable to create the layer shell");
+		ret = 1;
+		goto end;
+	}
+	server.new_layer_shell_v1_surface.notify = handle_layer_shell_v1_surface_new;
+	wl_signal_add(&server.layer_shell_v1->events.new_surface, &server.new_layer_shell_v1_surface);
+
 	if (!wlr_export_dmabuf_manager_v1_create(server.wl_display)) {
 		wlr_log(WLR_ERROR, "Unable to create the export DMABUF manager");
 		ret = 1;

layer_shell_v1.c

@@ -0,0 +1,27 @@
+/*
+ * Cage: A Wayland kiosk.
+ *
+ * Copyright (C) 2021 Jente Hidskes
+ *
+ * See the LICENSE file accompanying this file.
+ */
+
+#include "layer_shell_v1.h"
+#include "server.h"
+
+#include <wayland-server-core.h>
+#include <wlr/types/wlr_layer_shell_v1.h>
+#include <wlr/util/log.h>
+
+void
+handle_layer_shell_v1_surface_new(struct wl_listener *listener, void *data)
+{
+	struct cg_server *server = wl_container_of(listener, server, new_layer_shell_v1_surface);
+	struct wlr_layer_surface_v1 *layer_surface = data;
+
+	wlr_log(WLR_DEBUG, "New layer shell surface: namespace %s layer %d anchor %d size %dx%d margin %d,%d,%d,%d",
+		layer_surface->namespace, layer_surface->pending.layer, layer_surface->pending.anchor,
+		layer_surface->pending.desired_width, layer_surface->pending.desired_height,
+		layer_surface->pending.margin.top, layer_surface->pending.margin.right,
+		layer_surface->pending.margin.bottom, layer_surface->pending.margin.left);
+}

layer_shell_v1.h

@@ -0,0 +1,8 @@
+#ifndef CG_LAYER_SHELL_V1_H
+#define CG_LAYER_SHELL_V1_H
+
+#include <wayland-server-core.h>
+
+void handle_layer_shell_v1_surface_new(struct wl_listener *listener, void *data);
+
+#endif

meson.build

@@ -92,6 +92,7 @@ endif
 cage_sources = [
   'cage.c',
   'idle_inhibit_v1.c',
+  'layer_shell_v1.c',
   'output.c',
   'seat.c',
   'view.c',
@@ -103,6 +104,7 @@ cage_headers = [
                  output: 'config.h',
                  configuration: conf_data),
   'idle_inhibit_v1.h',
+  'layer_shell_v1.h',
   'output.h',
   'seat.h',
   'server.h',

server.h

@@ -52,6 +52,9 @@ struct cg_server {
 
 	struct wl_listener new_virtual_keyboard;
 	struct wl_listener new_virtual_pointer;
+
+	struct wlr_layer_shell_v1 *layer_shell_v1;
+	struct wl_listener new_layer_shell_v1_surface;
 #if CAGE_HAS_XWAYLAND
 	struct wl_listener new_xwayland_surface;
 #endif