Add initial layer shell skeleton

include/sway/layers.h

@@ -0,0 +1,24 @@
+#ifndef _SWAY_LAYERS_H
+#define _SWAY_LAYERS_H
+#include <stdbool.h>
+#include <wlr/types/wlr_box.h>
+#include <wlr/types/wlr_surface.h>
+#include <wlr/types/wlr_layer_shell.h>
+
+struct sway_layer_surface {
+	struct wlr_layer_surface *layer_surface;
+	struct wl_list link;
+
+	struct wl_listener destroy;
+	struct wl_listener map;
+	struct wl_listener unmap;
+	struct wl_listener surface_commit;
+	struct wl_listener output_destroy;
+	struct wl_listener output_mode;
+	struct wl_listener output_transform;
+
+	bool configured;
+	struct wlr_box geo;
+};
+
+#endif

include/sway/output.h

@@ -2,6 +2,7 @@
 #define _SWAY_OUTPUT_H
 #include <time.h>
 #include <wayland-server.h>
+#include <wlr/types/wlr_box.h>
 #include <wlr/types/wlr_output.h>
 
 struct sway_server;
@@ -13,6 +14,9 @@ struct sway_output {
 	struct sway_server *server;
 	struct timespec last_frame;
 
+	struct wl_list layers[4]; // sway_layer_surface::link
+	struct wlr_box usable_area;
+
 	struct wl_listener frame;
 	struct wl_listener output_destroy;
 };

include/sway/server.h

@@ -6,6 +6,7 @@
 #include <wlr/backend/session.h>
 #include <wlr/types/wlr_compositor.h>
 #include <wlr/types/wlr_data_device.h>
+#include <wlr/types/wlr_layer_shell.h>
 #include <wlr/types/wlr_xdg_shell_v6.h>
 #include <wlr/render/wlr_renderer.h>
 // TODO WLR: make Xwayland optional
@@ -27,6 +28,9 @@ struct sway_server {
 	struct wl_listener new_output;
 	struct wl_listener output_frame;
 
+	struct wlr_layer_shell *layer_shell;
+	struct wl_listener layer_shell_surface;
+
 	struct wlr_xdg_shell_v6 *xdg_shell_v6;
 	struct wl_listener xdg_shell_v6_surface;
 
@@ -46,6 +50,7 @@ void server_run(struct sway_server *server);
 
 void handle_new_output(struct wl_listener *listener, void *data);
 
+void handle_layer_shell_surface(struct wl_listener *listener, void *data);
 void handle_xdg_shell_v6_surface(struct wl_listener *listener, void *data);
 void handle_xwayland_surface(struct wl_listener *listener, void *data);
 void handle_wl_shell_surface(struct wl_listener *listener, void *data);

protocols/meson.build

@@ -14,24 +14,57 @@ wayland_scanner_client = generator(
 	arguments: ['client-header', '@INPUT@', '@OUTPUT@'],
 )
 
-protocols = [
+wayland_scanner_server = generator(
+	wayland_scanner,
+	output: '@BASENAME@-protocol.h',
+	arguments: ['server-header', '@INPUT@', '@OUTPUT@'],
+)
+
+client_protocols = [
 	[wl_protocol_dir, 'stable/xdg-shell/xdg-shell.xml'],
 	['wlr-layer-shell-unstable-v1.xml']
 ]
 
-wl_protos_src = []
+server_protocols = [
-wl_protos_headers = []
+	['wlr-layer-shell-unstable-v1.xml']
+]
+
+client_protos_src = []
+client_protos_headers = []
+
+server_protos_src = []
+server_protos_headers = []
 
-foreach p : protocols
+foreach p : client_protocols
 	xml = join_paths(p)
-	wl_protos_src += wayland_scanner_code.process(xml)
+	client_protos_src += wayland_scanner_code.process(xml)
-	wl_protos_headers += wayland_scanner_client.process(xml)
+	client_protos_headers += wayland_scanner_client.process(xml)
 endforeach
 
-lib_wl_protos = static_library('wl_protos', wl_protos_src + wl_protos_headers,
+foreach p : server_protocols
-	dependencies: [wayland_client]) # for the include directory
+	xml = join_paths(p)
+	server_protos_src += wayland_scanner_code.process(xml)
+	server_protos_headers += wayland_scanner_server.process(xml)
+endforeach
+
+lib_client_protos = static_library(
+	'client_protos',
+	client_protos_src + client_protos_headers,
+	dependencies: [wayland_client]
+) # for the include directory
+
+client_protos = declare_dependency(
+	link_with: lib_client_protos,
+	sources: client_protos_headers,
+)
+
+lib_server_protos = static_library(
+	'server_protos',
+	server_protos_src + server_protos_headers,
+	dependencies: [wayland_client]
+) # for the include directory
 
-sway_protos = declare_dependency(
+server_protos = declare_dependency(
-	link_with: lib_wl_protos,
+	link_with: lib_server_protos,
-	sources: wl_protos_headers,
+	sources: server_protos_headers,
 )

sway/desktop/layer_shell.c

@@ -0,0 +1,96 @@
+#include <stdlib.h>
+#include <wayland-server.h>
+#include <wlr/util/log.h>
+#include "sway/layers.h"
+#include "sway/output.h"
+#include "sway/server.h"
+
+static void arrange_layers(struct sway_output *output) {
+	// TODO
+}
+
+static void handle_output_destroy(struct wl_listener *listener, void *data) {
+	// TODO
+}
+
+static void handle_output_mode(struct wl_listener *listener, void *data) {
+	// TODO
+}
+
+static void handle_output_transform(struct wl_listener *listener, void *data) {
+	// TODO
+}
+
+static void handle_surface_commit(struct wl_listener *listener, void *data) {
+	// TODO
+}
+
+static void handle_destroy(struct wl_listener *listener, void *data) {
+	// TODO
+}
+
+static void handle_map(struct wl_listener *listener, void *data) {
+	// TODO
+}
+
+static void handle_unmap(struct wl_listener *listener, void *data) {
+	// TODO
+}
+
+void handle_layer_shell_surface(struct wl_listener *listener, void *data) {
+	struct wlr_layer_surface *layer_surface = data;
+	struct sway_server *server =
+		wl_container_of(listener, server, layer_shell_surface);
+	wlr_log(L_DEBUG, "new layer surface: namespace %s layer %d anchor %d "
+			"size %dx%d margin %d,%d,%d,%d",
+		layer_surface->namespace, layer_surface->layer, layer_surface->layer,
+		layer_surface->client_pending.desired_width,
+		layer_surface->client_pending.desired_height,
+		layer_surface->client_pending.margin.top,
+		layer_surface->client_pending.margin.right,
+		layer_surface->client_pending.margin.bottom,
+		layer_surface->client_pending.margin.left);
+
+	struct sway_layer_surface *sway_layer =
+		calloc(1, sizeof(struct sway_layer_surface));
+	if (!sway_layer) {
+		return;
+	}
+
+	sway_layer->surface_commit.notify = handle_surface_commit;
+	wl_signal_add(&layer_surface->surface->events.commit,
+		&sway_layer->surface_commit);
+
+	sway_layer->output_destroy.notify = handle_output_destroy;
+	wl_signal_add(&layer_surface->output->events.destroy,
+		&sway_layer->output_destroy);
+
+	sway_layer->output_mode.notify = handle_output_mode;
+	wl_signal_add(&layer_surface->output->events.mode,
+		&sway_layer->output_mode);
+
+	sway_layer->output_transform.notify = handle_output_transform;
+	wl_signal_add(&layer_surface->output->events.transform,
+		&sway_layer->output_transform);
+
+	sway_layer->destroy.notify = handle_destroy;
+	wl_signal_add(&layer_surface->events.destroy, &sway_layer->destroy);
+	sway_layer->map.notify = handle_map;
+	wl_signal_add(&layer_surface->events.map, &sway_layer->map);
+	sway_layer->unmap.notify = handle_unmap;
+	wl_signal_add(&layer_surface->events.unmap, &sway_layer->unmap);
+	// TODO: Listen for subsurfaces
+
+	sway_layer->layer_surface = layer_surface;
+	layer_surface->data = sway_layer;
+
+	struct sway_output *output = layer_surface->output->data;
+	wl_list_insert(&output->layers[layer_surface->layer], &sway_layer->link);
+
+	// Temporarily set the layer's current state to client_pending
+	// So that we can easily arrange it
+	struct wlr_layer_surface_state old_state = layer_surface->current;
+	layer_surface->current = layer_surface->client_pending;
+	arrange_layers(output);
+	layer_surface->current = old_state;
+}

sway/desktop/output.c

@@ -236,6 +236,7 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 		return;
 	}
 	output->wlr_output = wlr_output;
+	wlr_output->data = output;
 	output->server = server;
 
 	if (!wl_list_empty(&wlr_output->modes)) {
@@ -250,6 +251,11 @@ void handle_new_output(struct wl_listener *listener, void *data) {
 		return;
 	}
 
+	size_t len = sizeof(output->layers) / sizeof(output->layers[0]);
+	for (size_t i = 0; i < len; ++i) {
+		wl_list_init(&output->layers[i]);
+	}
+
 	sway_input_manager_configure_xcursor(input_manager);
 
 	wl_signal_add(&wlr_output->events.frame, &output->frame);

sway/meson.build

@@ -46,6 +46,7 @@ sway_sources = files(
 	'ipc-json.c',
 	'ipc-server.c',
 	'desktop/output.c',
+	'desktop/layer_shell.c',
 	'desktop/wl_shell.c',
 	'desktop/xdg_shell_v6.c',
 	'desktop/xwayland.c',
@@ -57,14 +58,15 @@ sway_sources = files(
 )
 
 sway_deps = [
+	jsonc,
+	libcap,
+	libinput,
+	math,
 	pcre,
 	pixman,
+	server_protos,
 	wayland_server,
-	jsonc,
 	wlroots,
-	libcap,
-	math,
-	libinput,
 	xkbcommon,
 ]
 

sway/server.c

@@ -7,6 +7,7 @@
 #include <wlr/render/wlr_renderer.h>
 #include <wlr/render/gles2.h>
 #include <wlr/types/wlr_compositor.h>
+#include <wlr/types/wlr_layer_shell.h>
 #include <wlr/types/wlr_wl_shell.h>
 // TODO WLR: make Xwayland optional
 #include <wlr/xwayland.h>
@@ -51,6 +52,11 @@ bool server_init(struct sway_server *server) {
 	server->new_output.notify = handle_new_output;
 	wl_signal_add(&server->backend->events.new_output, &server->new_output);
 
+	server->layer_shell = wlr_layer_shell_create(server->wl_display);
+	wl_signal_add(&server->layer_shell->events.new_surface,
+		&server->layer_shell_surface);
+	server->layer_shell_surface.notify = handle_layer_shell_surface;
+
 	server->xdg_shell_v6 = wlr_xdg_shell_v6_create(server->wl_display);
 	wl_signal_add(&server->xdg_shell_v6->events.new_surface,
 		&server->xdg_shell_v6_surface);

swaybg/meson.build

@@ -4,12 +4,12 @@ executable(
 	include_directories: [sway_inc],
 	dependencies: [
 		cairo,
+		client_protos,
 		gdk_pixbuf,
 		jsonc,
 		math,
 		pango,
 		pangocairo,
-		sway_protos,
 		wayland_client,
 		wlroots,
 	],