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Merge pull request #1369 from ascent12/wayland_backend 

Wayland backend improvements
This commit is contained in:
Drew DeVault 2018-11-12 16:13:18 -05:00 committed by GitHub
parent 3181c4bec0 180151ed09
commit d2d8372cdc
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 205 additions and 173 deletions
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1
backend/meson.build
View File

@ -23,7 +23,6 @@ backend_files = files(
'session/session.c', 'session/session.c',
'wayland/backend.c', 'wayland/backend.c',
'wayland/output.c', 'wayland/output.c',
'wayland/registry.c',
'wayland/wl_seat.c', 'wayland/wl_seat.c',
) )

257
backend/wayland/backend.c
View File

@ -1,131 +1,168 @@
#include <assert.h> #include <assert.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <limits.h> #include <limits.h>
#include <stdint.h> #include <stdint.h>
#include <stdlib.h> #include <stdlib.h>
#include <wlr/config.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <wayland-server.h> #include <wayland-server.h>
#include <wlr/backend/interface.h> #include <wlr/backend/interface.h>
#include <wlr/interfaces/wlr_input_device.h> #include <wlr/interfaces/wlr_input_device.h>
#include <wlr/interfaces/wlr_output.h> #include <wlr/interfaces/wlr_output.h>
#include <wlr/render/egl.h> #include <wlr/render/egl.h>
#include <wlr/render/gles2.h> #include <wlr/render/gles2.h>
#include <wlr/util/log.h> #include <wlr/util/log.h>
#include "backend/wayland.h" #include "backend/wayland.h"
#include "util/signal.h" #include "util/signal.h"
#include "xdg-shell-unstable-v6-client-protocol.h" #include "xdg-shell-unstable-v6-client-protocol.h"
struct wlr_wl_backend *get_wl_backend_from_backend( struct wlr_wl_backend *get_wl_backend_from_backend(struct wlr_backend *backend) {
struct wlr_backend *wlr_backend) { assert(wlr_backend_is_wl(backend));
assert(wlr_backend_is_wl(wlr_backend)); return (struct wlr_wl_backend *)backend;
return (struct wlr_wl_backend *)wlr_backend;
} }
static int dispatch_events(int fd, uint32_t mask, void *data) { static int dispatch_events(int fd, uint32_t mask, void *data) {
struct wlr_wl_backend *backend = data; struct wlr_wl_backend *wl = data;
int count = 0;
if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) { if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) {
wl_display_terminate(backend->local_display); wl_display_terminate(wl->local_display);
return 0; return 0;
} }
if (mask & WL_EVENT_READABLE) { if (mask & WL_EVENT_READABLE) {
count = wl_display_dispatch(backend->remote_display); return wl_display_dispatch(wl->remote_display);
}
if (mask & WL_EVENT_WRITABLE) {
wl_display_flush(wl->remote_display);
return 0;
} }
if (mask == 0) { if (mask == 0) {
count = wl_display_dispatch_pending(backend->remote_display); int count = wl_display_dispatch_pending(wl->remote_display);
wl_display_flush(backend->remote_display); wl_display_flush(wl->remote_display);
return count;
} }
return count;
return 0;
} }
static void xdg_shell_handle_ping(void *data, struct zxdg_shell_v6 *shell,
uint32_t serial) {
zxdg_shell_v6_pong(shell, serial);
}
static const struct zxdg_shell_v6_listener xdg_shell_listener = {
xdg_shell_handle_ping,
};
static void registry_global(void *data, struct wl_registry *registry,
uint32_t name, const char *iface, uint32_t version) {
struct wlr_wl_backend *wl = data;
wlr_log(WLR_DEBUG, "Remote wayland global: %s v%d", iface, version);
if (strcmp(iface, wl_compositor_interface.name) == 0) {
wl->compositor = wl_registry_bind(registry, name,
&wl_compositor_interface, 4);
} else if (strcmp(iface, wl_seat_interface.name) == 0) {
wl->seat = wl_registry_bind(registry, name,
&wl_seat_interface, 2);
wl_seat_add_listener(wl->seat, &seat_listener, wl);
} else if (strcmp(iface, wl_shm_interface.name) == 0) {
wl->shm = wl_registry_bind(registry, name,
&wl_shm_interface, 1);
} else if (strcmp(iface, zxdg_shell_v6_interface.name) == 0) {
wl->shell = wl_registry_bind(registry, name,
&zxdg_shell_v6_interface, 1);
zxdg_shell_v6_add_listener(wl->shell, &xdg_shell_listener, NULL);
}
}
static void registry_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// TODO
}
static const struct wl_registry_listener registry_listener = {
.global = registry_global,
.global_remove = registry_global_remove
};
/* /*
* Initializes the wayland backend. Opens a connection to a remote wayland * Initializes the wayland backend. Opens a connection to a remote wayland
* compositor and creates surfaces for each output, then registers globals on * compositor and creates surfaces for each output, then registers globals on
* the specified display. * the specified display.
*/ */
static bool backend_start(struct wlr_backend *wlr_backend) { static bool backend_start(struct wlr_backend *backend) {
struct wlr_wl_backend *backend = get_wl_backend_from_backend(wlr_backend); struct wlr_wl_backend *wl = get_wl_backend_from_backend(backend);
wlr_log(WLR_INFO, "Initializating wayland backend"); wlr_log(WLR_INFO, "Initializating wayland backend");
poll_wl_registry(backend); wl->started = true;
if (!backend->compositor || !backend->shell) {
wlr_log_errno(WLR_ERROR, "Could not obtain retrieve required globals"); if (wl->keyboard) {
return false; create_wl_keyboard(wl->keyboard, wl);
} }
backend->started = true; for (size_t i = 0; i < wl->requested_outputs; ++i) {
wlr_wl_output_create(&wl->backend);
for (size_t i = 0; i < backend->requested_outputs; ++i) {
wlr_wl_output_create(&backend->backend);
} }
struct wl_event_loop *loop = wl_display_get_event_loop(backend->local_display);
int fd = wl_display_get_fd(backend->remote_display);
int events = WL_EVENT_READABLE | WL_EVENT_ERROR | WL_EVENT_HANGUP;
backend->remote_display_src = wl_event_loop_add_fd(loop, fd, events,
dispatch_events, backend);
wl_event_source_check(backend->remote_display_src);
return true; return true;
} }
static void backend_destroy(struct wlr_backend *wlr_backend) { static void backend_destroy(struct wlr_backend *backend) {
struct wlr_wl_backend *backend = get_wl_backend_from_backend(wlr_backend); if (!backend) {
if (backend == NULL) {
return; return;
} }
struct wlr_wl_backend *wl = get_wl_backend_from_backend(backend);
struct wlr_wl_output *output, *tmp_output; struct wlr_wl_output *output, *tmp_output;
wl_list_for_each_safe(output, tmp_output, &backend->outputs, link) { wl_list_for_each_safe(output, tmp_output, &wl->outputs, link) {
wlr_output_destroy(&output->wlr_output); wlr_output_destroy(&output->wlr_output);
} }
struct wlr_input_device *input_device, *tmp_input_device; struct wlr_input_device *input_device, *tmp_input_device;
wl_list_for_each_safe(input_device, tmp_input_device, &backend->devices, link) { wl_list_for_each_safe(input_device, tmp_input_device, &wl->devices, link) {
wlr_input_device_destroy(input_device); wlr_input_device_destroy(input_device);
} }
wlr_signal_emit_safe(&wlr_backend->events.destroy, wlr_backend); wlr_signal_emit_safe(&wl->backend.events.destroy, &wl->backend);
wl_list_remove(&backend->local_display_destroy.link); wl_list_remove(&wl->local_display_destroy.link);
free(backend->seat_name); free(wl->seat_name);
if (backend->remote_display_src) { wl_event_source_remove(wl->remote_display_src);
wl_event_source_remove(backend->remote_display_src);
wlr_renderer_destroy(wl->renderer);
wlr_egl_finish(&wl->egl);
if (wl->pointer) {
wl_pointer_destroy(wl->pointer);
} }
wlr_renderer_destroy(backend->renderer); if (wl->seat) {
wlr_egl_finish(&backend->egl); wl_seat_destroy(wl->seat);
if (backend->pointer) {
wl_pointer_destroy(backend->pointer);
} }
if (backend->seat) { if (wl->shm) {
wl_seat_destroy(backend->seat); wl_shm_destroy(wl->shm);
} }
if (backend->shm) { zxdg_shell_v6_destroy(wl->shell);
wl_shm_destroy(backend->shm); wl_compositor_destroy(wl->compositor);
} wl_registry_destroy(wl->registry);
if (backend->shell) { wl_display_disconnect(wl->remote_display);
zxdg_shell_v6_destroy(backend->shell); free(wl);
}
if (backend->compositor) {
wl_compositor_destroy(backend->compositor);
}
if (backend->registry) {
wl_registry_destroy(backend->registry);
}
if (backend->remote_display) {
wl_display_disconnect(backend->remote_display);
}
free(backend);
} }
static struct wlr_renderer *backend_get_renderer( static struct wlr_renderer *backend_get_renderer(struct wlr_backend *backend) {
struct wlr_backend *wlr_backend) { struct wlr_wl_backend *wl = get_wl_backend_from_backend(backend);
struct wlr_wl_backend *backend = get_wl_backend_from_backend(wlr_backend); return wl->renderer;
return backend->renderer;
} }
static struct wlr_backend_impl backend_impl = { static struct wlr_backend_impl backend_impl = {
@ -139,38 +176,64 @@ bool wlr_backend_is_wl(struct wlr_backend *b) {
} }
static void handle_display_destroy(struct wl_listener *listener, void *data) { static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_wl_backend *backend = struct wlr_wl_backend *wl =
wl_container_of(listener, backend, local_display_destroy); wl_container_of(listener, wl, local_display_destroy);
backend_destroy(&backend->backend); backend_destroy(&wl->backend);
} }
struct wlr_backend *wlr_wl_backend_create(struct wl_display *display, struct wlr_backend *wlr_wl_backend_create(struct wl_display *display,
const char *remote, wlr_renderer_create_func_t create_renderer_func) { const char *remote, wlr_renderer_create_func_t create_renderer_func) {
wlr_log(WLR_INFO, "Creating wayland backend"); wlr_log(WLR_INFO, "Creating wayland backend");
struct wlr_wl_backend *backend = calloc(1, sizeof(struct wlr_wl_backend)); struct wlr_wl_backend *wl = calloc(1, sizeof(*wl));
if (!backend) { if (!wl) {
wlr_log(WLR_ERROR, "Allocation failed: %s", strerror(errno)); wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL; return NULL;
} }
wlr_backend_init(&backend->backend, &backend_impl);
wl_list_init(&backend->devices); wlr_backend_init(&wl->backend, &backend_impl);
wl_list_init(&backend->outputs);
backend->local_display = display; wl->local_display = display;
wl_list_init(&wl->devices);
wl_list_init(&wl->outputs);
backend->remote_display = wl_display_connect(remote); wl->remote_display = wl_display_connect(remote);
if (!backend->remote_display) { if (!wl->remote_display) {
wlr_log_errno(WLR_ERROR, "Could not connect to remote display"); wlr_log_errno(WLR_ERROR, "Could not connect to remote display");
goto error_connect; goto error_wl;
} }
backend->registry = wl_display_get_registry(backend->remote_display); wl->registry = wl_display_get_registry(wl->remote_display);
if (backend->registry == NULL) { if (!wl->registry) {
wlr_log_errno(WLR_ERROR, "Could not obtain reference to remote registry"); wlr_log_errno(WLR_ERROR, "Could not obtain reference to remote registry");
goto error_display;
}
wl_registry_add_listener(wl->registry, &registry_listener, wl);
wl_display_dispatch(wl->remote_display);
wl_display_roundtrip(wl->remote_display);
if (!wl->compositor) {
wlr_log(WLR_ERROR,
"Remote Wayland compositor does not support wl_compositor");
goto error_registry; goto error_registry;
} }
if (!wl->shell) {
wlr_log(WLR_ERROR,
"Remote Wayland compositor does not support zxdg_shell_v6");
goto error_registry;
}
struct wl_event_loop *loop = wl_display_get_event_loop(wl->local_display);
int fd = wl_display_get_fd(wl->remote_display);
int events = WL_EVENT_READABLE | WL_EVENT_ERROR | WL_EVENT_HANGUP;
wl->remote_display_src = wl_event_loop_add_fd(loop, fd, events,
dispatch_events, wl);
if (!wl->remote_display_src) {
wlr_log(WLR_ERROR, "Failed to create event source");
goto error_registry;
}
wl_event_source_check(wl->remote_display_src);
static EGLint config_attribs[] = { static EGLint config_attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT, EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
@ -185,24 +248,32 @@ struct wlr_backend *wlr_wl_backend_create(struct wl_display *display,
create_renderer_func = wlr_renderer_autocreate; create_renderer_func = wlr_renderer_autocreate;
} }
backend->renderer = create_renderer_func(&backend->egl, EGL_PLATFORM_WAYLAND_EXT, wl->renderer = create_renderer_func(&wl->egl, EGL_PLATFORM_WAYLAND_EXT,
backend->remote_display, config_attribs, WL_SHM_FORMAT_ARGB8888); wl->remote_display, config_attribs, WL_SHM_FORMAT_ARGB8888);
if (backend->renderer == NULL) { if (!wl->renderer) {
wlr_log(WLR_ERROR, "Could not create renderer"); wlr_log(WLR_ERROR, "Could not create renderer");
goto error_renderer; goto error_event;
} }
backend->local_display_destroy.notify = handle_display_destroy; wl->local_display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->local_display_destroy); wl_display_add_destroy_listener(display, &wl->local_display_destroy);
return &backend->backend; return &wl->backend;
error_renderer: error_event:
wl_registry_destroy(backend->registry); wl_event_source_remove(wl->remote_display_src);
error_registry: error_registry:
wl_display_disconnect(backend->remote_display); if (wl->compositor) {
error_connect: wl_compositor_destroy(wl->compositor);
free(backend); }
if (wl->shell) {
zxdg_shell_v6_destroy(wl->shell);
}
wl_registry_destroy(wl->registry);
error_display:
wl_display_disconnect(wl->remote_display);
error_wl:
free(wl);
return NULL; return NULL;
} }

3
backend/wayland/output.c
View File

@ -6,11 +6,14 @@
#include <sys/mman.h> #include <sys/mman.h>
#include <sys/types.h> #include <sys/types.h>
#include <unistd.h> #include <unistd.h>
#include <wayland-client.h> #include <wayland-client.h>
#include <wlr/interfaces/wlr_output.h> #include <wlr/interfaces/wlr_output.h>
#include <wlr/render/wlr_renderer.h> #include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_matrix.h> #include <wlr/types/wlr_matrix.h>
#include <wlr/util/log.h> #include <wlr/util/log.h>
#include "backend/wayland.h" #include "backend/wayland.h"
#include "util/signal.h" #include "util/signal.h"
#include "xdg-shell-unstable-v6-client-protocol.h" #include "xdg-shell-unstable-v6-client-protocol.h"

55
backend/wayland/registry.c
View File

@ -1,55 +0,0 @@
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wayland-client.h>
#include <wlr/util/log.h>
#include "backend/wayland.h"
#include "xdg-shell-unstable-v6-client-protocol.h"
static void xdg_shell_handle_ping(void *data, struct zxdg_shell_v6 *shell,
uint32_t serial) {
zxdg_shell_v6_pong(shell, serial);
}
static const struct zxdg_shell_v6_listener xdg_shell_listener = {
xdg_shell_handle_ping,
};
static void registry_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version) {
struct wlr_wl_backend *backend = data;
wlr_log(WLR_DEBUG, "Remote wayland global: %s v%d", interface, version);
if (strcmp(interface, wl_compositor_interface.name) == 0) {
backend->compositor = wl_registry_bind(registry, name,
&wl_compositor_interface, version);
} else if (strcmp(interface, zxdg_shell_v6_interface.name) == 0) {
backend->shell = wl_registry_bind(registry, name,
&zxdg_shell_v6_interface, version);
zxdg_shell_v6_add_listener(backend->shell, &xdg_shell_listener, NULL);
} else if (strcmp(interface, wl_shm_interface.name) == 0) {
backend->shm = wl_registry_bind(registry, name,
&wl_shm_interface, version);
} else if (strcmp(interface, wl_seat_interface.name) == 0) {
backend->seat = wl_registry_bind(registry, name,
&wl_seat_interface, version);
wl_seat_add_listener(backend->seat, &seat_listener, backend);
}
}
static void registry_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// TODO
}
static const struct wl_registry_listener registry_listener = {
.global = registry_global,
.global_remove = registry_global_remove
};
void poll_wl_registry(struct wlr_wl_backend *backend) {
wl_registry_add_listener(backend->registry, &registry_listener, backend);
wl_display_dispatch(backend->remote_display);
wl_display_roundtrip(backend->remote_display);
}

51
backend/wayland/wl_seat.c
View File

@ -1,16 +1,20 @@
#define _POSIX_C_SOURCE 200809L #define _POSIX_C_SOURCE 200809L
#include <assert.h> #include <assert.h>
#include <stdint.h> #include <stdint.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <time.h> #include <time.h>
#include <wayland-client.h> #include <wayland-client.h>
#include <wlr/interfaces/wlr_input_device.h> #include <wlr/interfaces/wlr_input_device.h>
#include <wlr/interfaces/wlr_keyboard.h> #include <wlr/interfaces/wlr_keyboard.h>
#include <wlr/interfaces/wlr_output.h> #include <wlr/interfaces/wlr_output.h>
#include <wlr/interfaces/wlr_pointer.h> #include <wlr/interfaces/wlr_pointer.h>
#include <wlr/interfaces/wlr_touch.h> #include <wlr/interfaces/wlr_touch.h>
#include <wlr/util/log.h> #include <wlr/util/log.h>
#include "backend/wayland.h" #include "backend/wayland.h"
#include "util/signal.h" #include "util/signal.h"
@ -321,8 +325,7 @@ static void pointer_handle_output_destroy(struct wl_listener *listener,
wlr_input_device_destroy(&pointer->input_device->wlr_input_device); wlr_input_device_destroy(&pointer->input_device->wlr_input_device);
} }
void create_wl_pointer(struct wl_pointer *wl_pointer, void create_wl_pointer(struct wl_pointer *wl_pointer, struct wlr_wl_output *output) {
struct wlr_wl_output *output) {
struct wlr_wl_backend *backend = output->backend; struct wlr_wl_backend *backend = output->backend;
struct wlr_input_device *wlr_dev; struct wlr_input_device *wlr_dev;
@ -364,6 +367,28 @@ void create_wl_pointer(struct wl_pointer *wl_pointer,
wlr_signal_emit_safe(&backend->backend.events.new_input, wlr_dev); wlr_signal_emit_safe(&backend->backend.events.new_input, wlr_dev);
} }
void create_wl_keyboard(struct wl_keyboard *wl_keyboard, struct wlr_wl_backend *wl) {
struct wlr_wl_input_device *dev =
create_wl_input_device(wl, WLR_INPUT_DEVICE_KEYBOARD);
if (!dev) {
return;
}
struct wlr_input_device *wlr_dev = &dev->wlr_input_device;
wlr_dev->keyboard = calloc(1, sizeof(*wlr_dev->keyboard));
if (!wlr_dev->keyboard) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
free(dev);
return;
}
wlr_keyboard_init(wlr_dev->keyboard, NULL);
wl_keyboard_add_listener(wl_keyboard, &keyboard_listener, wlr_dev);
dev->resource = wl_keyboard;
wlr_signal_emit_safe(&wl->backend.events.new_input, wlr_dev);
}
static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat, static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
enum wl_seat_capability caps) { enum wl_seat_capability caps) {
struct wlr_wl_backend *backend = data; struct wlr_wl_backend *backend = data;
@ -384,25 +409,13 @@ static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
} }
if ((caps & WL_SEAT_CAPABILITY_KEYBOARD)) { if ((caps & WL_SEAT_CAPABILITY_KEYBOARD)) {
wlr_log(WLR_DEBUG, "seat %p offered keyboard", (void*) wl_seat); wlr_log(WLR_DEBUG, "seat %p offered keyboard", (void*) wl_seat);
struct wlr_wl_input_device *dev = create_wl_input_device(backend,
WLR_INPUT_DEVICE_KEYBOARD);
if (dev == NULL) {
wlr_log(WLR_ERROR, "Allocation failed");
return;
}
struct wlr_input_device *wlr_dev = &dev->wlr_input_device;
wlr_dev->keyboard = calloc(1, sizeof(struct wlr_keyboard));
if (!wlr_dev->keyboard) {
free(dev);
wlr_log(WLR_ERROR, "Allocation failed");
return;
}
wlr_keyboard_init(wlr_dev->keyboard, NULL);
struct wl_keyboard *wl_keyboard = wl_seat_get_keyboard(wl_seat); struct wl_keyboard *wl_keyboard = wl_seat_get_keyboard(wl_seat);
wl_keyboard_add_listener(wl_keyboard, &keyboard_listener, wlr_dev); backend->keyboard = wl_keyboard;
dev->resource = wl_keyboard;
wlr_signal_emit_safe(&backend->backend.events.new_input, wlr_dev); if (backend->started) {
create_wl_keyboard(wl_keyboard, backend);
}
} }
} }

11
include/backend/wayland.h
View File

@ -2,10 +2,12 @@
#define BACKEND_WAYLAND_H #define BACKEND_WAYLAND_H
#include <stdbool.h> #include <stdbool.h>
#include <wayland-client.h> #include <wayland-client.h>
#include <wayland-egl.h> #include <wayland-egl.h>
#include <wayland-server.h> #include <wayland-server.h>
#include <wayland-util.h> #include <wayland-util.h>
#include <wlr/backend/wayland.h> #include <wlr/backend/wayland.h>
#include <wlr/render/egl.h> #include <wlr/render/egl.h>
#include <wlr/render/wlr_renderer.h> #include <wlr/render/wlr_renderer.h>
@ -32,6 +34,7 @@ struct wlr_wl_backend {
struct wl_shm *shm; struct wl_shm *shm;
struct wl_seat *seat; struct wl_seat *seat;
struct wl_pointer *pointer; struct wl_pointer *pointer;
struct wl_keyboard *keyboard;
struct wlr_wl_pointer *current_pointer; struct wlr_wl_pointer *current_pointer;
char *seat_name; char *seat_name;
}; };
@ -78,13 +81,11 @@ struct wlr_wl_pointer {
struct wl_listener output_destroy; struct wl_listener output_destroy;
}; };
struct wlr_wl_backend *get_wl_backend_from_backend( struct wlr_wl_backend *get_wl_backend_from_backend(struct wlr_backend *backend);
struct wlr_backend *wlr_backend);
void poll_wl_registry(struct wlr_wl_backend *backend);
void update_wl_output_cursor(struct wlr_wl_output *output); void update_wl_output_cursor(struct wlr_wl_output *output);
struct wlr_wl_pointer *pointer_get_wl(struct wlr_pointer *wlr_pointer); struct wlr_wl_pointer *pointer_get_wl(struct wlr_pointer *wlr_pointer);
void create_wl_pointer(struct wl_pointer *wl_pointer, void create_wl_pointer(struct wl_pointer *wl_pointer, struct wlr_wl_output *output);
struct wlr_wl_output *output); void create_wl_keyboard(struct wl_keyboard *wl_keyboard, struct wlr_wl_backend *wl);
extern const struct wl_seat_listener seat_listener; extern const struct wl_seat_listener seat_listener;