Basic support for extensions in server and clients

CMakeLists.txt

@@ -5,7 +5,8 @@ project(sway C)
 set(CMAKE_C_FLAGS "-g")
 set(CMAKE_C_STANDARD 99)
 SET(CMAKE_C_EXTENSIONS OFF)
-set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/bin")
+set(CMAKE_CURRENT_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/bin")
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
 add_definitions("-Wall -Wextra -Wno-unused-parameter -D_GNU_SOURCE")
 list(INSERT CMAKE_MODULE_PATH 0
   "${CMAKE_CURRENT_SOURCE_DIR}/CMake")
@@ -38,28 +39,35 @@ find_package(XKBCommon REQUIRED)
 find_package(WLC REQUIRED)
 find_package(A2X REQUIRED)
 find_package(PCRE REQUIRED)
+find_package(Wayland REQUIRED)
 find_package(JsonC REQUIRED)
 
 FILE(GLOB sources ${PROJECT_SOURCE_DIR}/sway/*.c)
 FILE(GLOB common ${PROJECT_SOURCE_DIR}/common/*.c)
 
+include(Wayland)
+WAYLAND_ADD_PROTOCOL_SERVER(proto-desktop-shell "${PROJECT_SOURCE_DIR}/protocols/desktop-shell.xml" desktop-shell)
+
 include_directories(
    ${WLC_INCLUDE_DIRS}
    ${PCRE_INCLUDE_DIRS}
    ${JSONC_INCLUDE_DIRS}
    ${XKBCOMMON_INCLUDE_DIRS}
+   ${CMAKE_CURRENT_BINARY_DIR}
 )
 
 add_executable(sway
     ${sources}
     ${common}
+    ${proto-desktop-shell}
 )
 
 target_link_libraries(sway
    ${WLC_LIBRARIES}
    ${XKBCOMMON_LIBRARIES}
    ${PCRE_LIBRARIES}
    ${JSONC_LIBRARIES}
+   ${WAYLAND_SERVER_LIBRARIES}
 )
 
 install(

include/client/client.h

@@ -2,6 +2,7 @@
 #define _CLIENT_H
 
 #include <wayland-client.h>
+#include "wayland-desktop-shell-client-protocol.h"
 #include <cairo/cairo.h>
 #include <pango/pangocairo.h>
 #include <stdbool.h>
@@ -41,13 +42,14 @@ struct client_state {
         struct wl_surface *surface;
         struct wl_shell_surface *shell_surface;
         struct wl_callback *frame_cb;
+        struct desktop_shell *desktop_shell;
         struct cursor cursor;
         uint32_t width, height;
         cairo_t *cairo;
         list_t *outputs;
 };
 
-struct client_state *client_setup(uint32_t width, uint32_t height);
+struct client_state *client_setup(uint32_t width, uint32_t height, bool shell_surface);
 void client_teardown(struct client_state *state);
 int client_prerender(struct client_state *state);
 int client_render(struct client_state *state);

include/extensions.h

@@ -0,0 +1,6 @@
+#ifndef _SWAY_EXTENSIONS_H
+#define _SWAY_EXTENSIONS_H
+
+void register_extensions(void);
+
+#endif

protocols/desktop-shell.xml

@@ -0,0 +1,138 @@
+<protocol name="desktop">
+
+  <interface name="desktop_shell" version="3">
+    <description summary="create desktop widgets and helpers">
+      Traditional user interfaces can rely on this interface to define the
+      foundations of typical desktops. Currently it's possible to set up
+      background, panels and locking surfaces.
+    </description>
+
+    <request name="set_background">
+      <arg name="output" type="object" interface="wl_output"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+    </request>
+
+    <request name="set_panel">
+      <arg name="output" type="object" interface="wl_output"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+    </request>
+
+    <request name="set_lock_surface">
+      <arg name="surface" type="object" interface="wl_surface"/>
+    </request>
+
+    <request name="unlock"/>
+
+    <request name="set_grab_surface">
+      <description summary="set grab surface">
+	The surface set by this request will receive a fake
+	pointer.enter event during grabs at position 0, 0 and is
+	expected to set an appropriate cursor image as described by
+	the grab_cursor event sent just before the enter event.
+      </description>
+      <arg name="surface" type="object" interface="wl_surface"/>
+    </request>
+
+    <!-- We'll fold most of wl_shell into this interface and then
+         they'll share the configure event.  -->
+    <event name="configure">
+      <arg name="edges" type="uint"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="width" type="int"/>
+      <arg name="height" type="int"/>
+    </event>
+
+    <event name="prepare_lock_surface">
+      <description summary="tell the client to create, set the lock surface">
+	Tell the client we want it to create and set the lock surface, which is
+	a GUI asking the user to unlock the screen. The lock surface is
+	announced with 'set_lock_surface'. Whether or not the client actually
+	implements locking, it MUST send 'unlock' request to let the normal
+        desktop resume.
+      </description>
+    </event>
+
+    <event name="grab_cursor">
+      <description summary="tell client what cursor to show during a grab">
+	This event will be sent immediately before a fake enter event on the
+	grab surface.
+      </description>
+      <arg name="cursor" type="uint"/>
+    </event>
+
+    <enum name="cursor">
+      <entry name="none" value="0"/>
+
+      <entry name="resize_top" value="1"/>
+      <entry name="resize_bottom" value="2"/>
+
+      <entry name="arrow" value="3"/>
+
+      <entry name="resize_left" value="4"/>
+      <entry name="resize_top_left" value="5"/>
+      <entry name="resize_bottom_left" value="6"/>
+
+      <entry name="move" value="7"/>
+
+      <entry name="resize_right" value="8"/>
+      <entry name="resize_top_right" value="9"/>
+      <entry name="resize_bottom_right" value="10"/>
+
+      <entry name="busy" value="11"/>
+    </enum>
+
+    <!-- Version 2 additions -->
+
+    <request name="desktop_ready" since="2">
+      <description summary="desktop is ready to be shown">
+	Tell the server, that enough desktop elements have been drawn
+	to make the desktop look ready for use. During start-up, the
+	server can wait for this request with a black screen before
+	starting to fade in the desktop, for instance. If the client
+	parts of a desktop take a long time to initialize, we avoid
+	showing temporary garbage.
+      </description>
+    </request>
+
+    <!-- Version 3 additions -->
+
+    <enum name="panel_position">
+      <entry name="top" value="0"/>
+      <entry name="bottom" value="1"/>
+      <entry name="left" value="2"/>
+      <entry name="right" value="3"/>
+    </enum>
+
+    <enum name="error">
+      <entry name="invalid_argument" value="0"
+        summary="an invalid argument was provided in a request"/>
+    </enum>
+
+    <request name="set_panel_position" since="3">
+      <arg name="position" type="uint"/>
+      <description summary="set panel position">
+        Tell the shell which side of the screen the panel is
+        located. This is so that new windows do not overlap the panel
+        and maximized windows maximize properly.
+      </description>
+    </request>
+
+  </interface>
+
+  <interface name="screensaver" version="1">
+    <description summary="interface for implementing screensavers">
+      Only one client can bind this interface at a time.
+    </description>
+
+    <request name="set_surface">
+      <description summary="set the surface type as a screensaver">
+	A screensaver surface is normally hidden, and only visible after an
+        idle timeout.
+      </description>
+
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="output" type="object" interface="wl_output"/>
+    </request>
+
+  </interface>
+</protocol>

sway/extensions.c

@@ -0,0 +1,32 @@
+#include <wlc/wlc.h>
+#include <wlc/wlc-wayland.h>
+#include "wayland-desktop-shell-server-protocol.h"
+#include "log.h"
+
+static void set_background(struct wl_client *client, struct wl_resource *resource,
+		struct wl_resource *output, struct wl_resource *surface) {
+	sway_log(L_DEBUG, "Surface requesting background for output");
+}
+
+static struct desktop_shell_interface desktop_shell_implementation = {
+	.set_background = set_background,
+};
+
+static void desktop_shell_bind(struct wl_client *client, void *data,
+		unsigned int version, unsigned int id) {
+	if (version > 1) {
+		// Unsupported version
+		return;
+	}
+
+	struct wl_resource *resource = wl_resource_create(client, &desktop_shell_interface, version, id);
+	if (!resource) {
+		wl_client_post_no_memory(client);
+	}
+
+	wl_resource_set_implementation(resource, &desktop_shell_implementation, NULL, NULL);
+}
+
+void register_extensions(void) {
+	wl_global_create(wlc_get_wl_display(), &desktop_shell_interface, 1, NULL, desktop_shell_bind);
+}

sway/main.c

@@ -7,6 +7,7 @@
 #include <sys/un.h>
 #include <signal.h>
 #include <getopt.h>
+#include "extensions.h"
 #include "layout.h"
 #include "stringop.h"
 #include "config.h"
@@ -73,6 +74,8 @@ int main(int argc, char **argv) {
 	if (!wlc_init(&interface, argc, argv)) {
 		return 1;
 	}
+
+	register_extensions();
 
 	char *config_path = NULL;
 

swaybg/CMakeLists.txt

@@ -7,6 +7,7 @@ find_package(Pango REQUIRED)
 include(Wayland)
 set(CMAKE_CURRENT_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/../bin/)
 WAYLAND_ADD_PROTOCOL_CLIENT(proto-xdg-shell "${PROJECT_SOURCE_DIR}/../protocols/xdg-shell.xml" xdg-shell)
+WAYLAND_ADD_PROTOCOL_CLIENT(proto-desktop-shell "${PROJECT_SOURCE_DIR}/../protocols/desktop-shell.xml" desktop-shell)
 
 include_directories(
   ${WAYLAND_CLIENT_INCLUDE_DIR}
@@ -24,6 +25,7 @@ add_executable(swaybg
   ${wl_sources}
   ${common}
   ${proto-xdg-shell}
+  ${proto-desktop-shell}
 )
 
 TARGET_LINK_LIBRARIES(swaybg ${WAYLAND_CLIENT_LIBRARIES} ${WAYLAND_CURSOR_LIBRARIES} ${CAIRO_LIBRARIES} ${PANGO_LIBRARIES} m)

swaybg/main.c

@@ -1,3 +1,4 @@
+#include "wayland-desktop-shell-client-protocol.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <wayland-client.h>
@@ -14,12 +15,16 @@ void sway_terminate(void) {
 
 int main(int argc, char **argv) {
 	init_log(L_INFO);
-	if (!(state = client_setup(100, 100))) {
+	if (!(state = client_setup(100, 100, false))) {
 		return -1;
 	}
+	if (!state->desktop_shell) {
+		sway_abort("swaybg requires the compositor to support the desktop-shell extension.");
+	}
 	struct output_state *output = state->outputs->items[0];
 	state->width = output->width;
 	state->height = output->height;
+	desktop_shell_set_background(state->desktop_shell, output->output, state->surface);
 
 	uint8_t r = 0, g = 0, b = 0;
 

wayland/client.c

@@ -1,6 +1,7 @@
 #include <wayland-client.h>
 #include <wayland-cursor.h>
 #include "wayland-xdg-shell-client-protocol.h"
+#include "wayland-desktop-shell-client-protocol.h"
 #include <cairo/cairo.h>
 #include <pango/pangocairo.h>
 #include <stdlib.h>
@@ -96,6 +97,8 @@ static void registry_global(void *data, struct wl_registry *registry,
 		ostate->output = output;
 		wl_output_add_listener(output, &output_listener, ostate);
 		list_add(state->outputs, ostate);
+	} else if (strcmp(interface, desktop_shell_interface.name) == 0) {
+		state->desktop_shell = wl_registry_bind(registry, name, &desktop_shell_interface, version);
 	}
 }
 
@@ -119,7 +122,7 @@ static const struct wl_shell_surface_listener surface_listener = {
 	.configure = shell_surface_configure
 };
 
-struct client_state *client_setup(uint32_t width, uint32_t height) {
+struct client_state *client_setup(uint32_t width, uint32_t height, bool shell_surface) {
 	struct client_state *state = malloc(sizeof(struct client_state));
 	memset(state, 0, sizeof(struct client_state));
 	state->outputs = create_list();
@@ -140,9 +143,11 @@ struct client_state *client_setup(uint32_t width, uint32_t height) {
 	wl_registry_destroy(registry);
 
 	state->surface = wl_compositor_create_surface(state->compositor);
-	state->shell_surface = wl_shell_get_shell_surface(state->shell, state->surface);
-	wl_shell_surface_add_listener(state->shell_surface, &surface_listener, state);
-	wl_shell_surface_set_toplevel(state->shell_surface);
+	if (shell_surface) {
+		state->shell_surface = wl_shell_get_shell_surface(state->shell, state->surface);
+		wl_shell_surface_add_listener(state->shell_surface, &surface_listener, state);
+		wl_shell_surface_set_toplevel(state->shell_surface);
+	}
 
 	state->cursor.cursor_theme = wl_cursor_theme_load("default", 32, state->shm); // TODO: let you customize this
 	state->cursor.cursor = wl_cursor_theme_get_cursor(state->cursor.cursor_theme, "left_ptr");