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backend: return wlr_session in wlr_backend_autocreate() call

Browse source 
Up until now, wlr_backend_autocreate() created the wlr_session and
then stuffed it into struct wlr_multi_backend so that compositors
can grab it later.

This is an abuse of wlr_multi_backend and the wlr_backend API:
wlr_backend_get_session() and wlr_multi_backend.session only exist
to accomodate the needs of wlr_backend_autocreate(). What's more,
the DRM and libinput backends don't implement
wlr_backend_impl.get_session.

Instead, return the struct wlr_session to the compositor in the
wlr_backend_autocreate() call. wlr_backend_get_session() will be
removed in the next commit.
This commit is contained in:
Simon Ser 2022-11-03 18:25:05 +01:00 committed by Alexander Orzechowski
parent 265439600e
commit 41b7acbab7
13 changed files with 57 additions and 50 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

79
backend/backend.c
View file

@ -245,7 +245,8 @@ static struct wlr_backend *attempt_drm_backend(struct wl_display *display,
#endif
static bool attempt_backend_by_name(struct wl_display *display,
struct wlr_multi_backend *multi, char *name) {
struct wlr_backend *multi, char *name,
struct wlr_session **session_ptr) {
struct wlr_backend *backend = NULL;
if (strcmp(name, "wayland") == 0) {
backend = attempt_wl_backend(display);
@ -257,9 +258,9 @@ static bool attempt_backend_by_name(struct wl_display *display,
backend = attempt_headless_backend(display);
} else if (strcmp(name, "drm") == 0 || strcmp(name, "libinput") == 0) {
// DRM and libinput need a session
if (multi->session == NULL) {
multi->session = session_create_and_wait(display);
if (multi->session == NULL) {
if (*session_ptr == NULL) {
*session_ptr = session_create_and_wait(display);
if (*session_ptr == NULL) {
wlr_log(WLR_ERROR, "failed to start a session");
return false;
}
@ -267,13 +268,13 @@ static bool attempt_backend_by_name(struct wl_display *display,
if (strcmp(name, "libinput") == 0) {
#if WLR_HAS_LIBINPUT_BACKEND
backend = wlr_libinput_backend_create(display, multi->session);
backend = wlr_libinput_backend_create(display, *session_ptr);
#endif
} else {
#if WLR_HAS_DRM_BACKEND
// attempt_drm_backend adds the multi drm backends itself
return attempt_drm_backend(display, &multi->backend,
multi->session) != NULL;
return attempt_drm_backend(display, multi,
*session_ptr) != NULL;
#endif
}
} else {
@ -281,12 +282,17 @@ static bool attempt_backend_by_name(struct wl_display *display,
return false;
}
return wlr_multi_backend_add(&multi->backend, backend);
return wlr_multi_backend_add(multi, backend);
}
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
struct wlr_session **session_ptr) {
if (session_ptr != NULL) {
*session_ptr = NULL;
}
struct wlr_session *session = NULL;
struct wlr_backend *backend = wlr_multi_backend_create(display);
struct wlr_multi_backend *multi = (struct wlr_multi_backend *)backend;
if (!backend) {
wlr_log(WLR_ERROR, "could not allocate multibackend");
return NULL;
@ -300,26 +306,23 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
names = strdup(names);
if (names == NULL) {
wlr_log(WLR_ERROR, "allocation failed");
wlr_backend_destroy(backend);
return NULL;
goto error;
}
char *saveptr;
char *name = strtok_r(names, ",", &saveptr);
while (name != NULL) {
if (!attempt_backend_by_name(display, multi, name)) {
if (!attempt_backend_by_name(display, backend, name, &session)) {
wlr_log(WLR_ERROR, "failed to add backend '%s'", name);
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
free(names);
return NULL;
goto error;
}
name = strtok_r(NULL, ",", &saveptr);
}
free(names);
return backend;
goto success;
}
if (getenv("WAYLAND_DISPLAY") || getenv("WAYLAND_SOCKET")) {
@ -329,7 +332,7 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
}
wlr_multi_backend_add(backend, wl_backend);
return backend;
goto success;
}
#if WLR_HAS_X11_BACKEND
@ -342,26 +345,23 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
}
wlr_multi_backend_add(backend, x11_backend);
return backend;
goto success;
}
#endif
// Attempt DRM+libinput
multi->session = session_create_and_wait(display);
if (!multi->session) {
session = session_create_and_wait(display);
if (!session) {
wlr_log(WLR_ERROR, "Failed to start a DRM session");
wlr_backend_destroy(backend);
return NULL;
goto error;
}
#if WLR_HAS_LIBINPUT_BACKEND
struct wlr_backend *libinput = wlr_libinput_backend_create(display,
multi->session);
struct wlr_backend *libinput =
wlr_libinput_backend_create(display, session);
if (!libinput) {
wlr_log(WLR_ERROR, "Failed to start libinput backend");
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
return NULL;
goto error;
}
wlr_multi_backend_add(backend, libinput);
#else
@ -372,28 +372,31 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
wlr_log(WLR_ERROR, "libinput support is not compiled in, "
"refusing to start");
wlr_log(WLR_ERROR, "Set WLR_LIBINPUT_NO_DEVICES=1 to suppress this check");
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
return NULL;
goto error;
}
#endif
#if WLR_HAS_DRM_BACKEND
struct wlr_backend *primary_drm =
attempt_drm_backend(display, backend, multi->session);
attempt_drm_backend(display, backend, session);
if (!primary_drm) {
wlr_log(WLR_ERROR, "Failed to open any DRM device");
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
return NULL;
goto error;
}
drm_backend_monitor_create(backend, primary_drm, multi->session);
return backend;
drm_backend_monitor_create(backend, primary_drm, session);
#endif
success:
struct wlr_multi_backend *multi = wl_container_of(backend, multi, backend);
multi->session = session;
if (session_ptr != NULL) {
*session_ptr = session;
}
return backend;
error:
wlr_backend_destroy(backend);
wlr_session_destroy(session);
return NULL;
}

2
examples/fullscreen-shell.c
View file

@ -205,7 +205,7 @@ int main(int argc, char *argv[]) {
struct fullscreen_server server = {0};
server.wl_display = wl_display_create();
server.backend = wlr_backend_autocreate(server.wl_display);
server.backend = wlr_backend_autocreate(server.wl_display, NULL);
server.renderer = wlr_renderer_autocreate(server.backend);
wlr_renderer_init_wl_display(server.renderer, server.wl_display);
server.allocator = wlr_allocator_autocreate(server.backend,

2
examples/multi-pointer.c
View file

@ -272,7 +272,7 @@ int main(int argc, char *argv[]) {
.clear_color = { 0.25f, 0.25f, 0.25f, 1 },
.display = display,
};
struct wlr_backend *wlr = wlr_backend_autocreate(display);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
if (!wlr) {
exit(1);
}

2
examples/output-layout.c
View file

@ -268,7 +268,7 @@ int main(int argc, char *argv[]) {
state.layout = wlr_output_layout_create();
clock_gettime(CLOCK_MONOTONIC, &state.ts_last);
struct wlr_backend *wlr = wlr_backend_autocreate(display);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
if (!wlr) {
exit(1);
}

2
examples/pointer.c
View file

@ -333,7 +333,7 @@ int main(int argc, char *argv[]) {
.display = display
};
struct wlr_backend *wlr = wlr_backend_autocreate(display);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
if (!wlr) {
exit(1);
}

2
examples/quads.c
View file

@ -189,7 +189,7 @@ int main(int argc, char *argv[]) {
};
wl_list_init(&state.outputs);
struct wlr_backend *wlr = wlr_backend_autocreate(display);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
if (!wlr) {
exit(1);
}

2
examples/rotation.c
View file

@ -239,7 +239,7 @@ int main(int argc, char *argv[]) {
};
wl_list_init(&state.outputs);
struct wlr_backend *wlr = wlr_backend_autocreate(display);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
if (!wlr) {
exit(1);
}

2
examples/scene-graph.c
View file

@ -157,7 +157,7 @@ int main(int argc, char *argv[]) {
struct server server = {0};
server.surface_offset = 0;
server.display = wl_display_create();
server.backend = wlr_backend_autocreate(server.display);
server.backend = wlr_backend_autocreate(server.display, NULL);
server.scene = wlr_scene_create();
server.renderer = wlr_renderer_autocreate(server.backend);

2
examples/simple.c
View file

@ -172,7 +172,7 @@ int main(void) {
.last_frame = { 0 },
.display = display
};
struct wlr_backend *backend = wlr_backend_autocreate(display);
struct wlr_backend *backend = wlr_backend_autocreate(display, NULL);
if (!backend) {
exit(1);
}

2
examples/tablet.c
View file

@ -355,7 +355,7 @@ int main(int argc, char *argv[]) {
};
wl_list_init(&state.tablet_pads);
wl_list_init(&state.tablet_tools);
struct wlr_backend *wlr = wlr_backend_autocreate(display);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
if (!wlr) {
exit(1);
}

2
examples/touch.c
View file

@ -248,7 +248,7 @@ int main(int argc, char *argv[]) {
wl_list_init(&state.touch_points);
wl_list_init(&state.touch);
struct wlr_backend *wlr = wlr_backend_autocreate(display);
struct wlr_backend *wlr = wlr_backend_autocreate(display, NULL);
if (!wlr) {
exit(1);
}

6
include/wlr/backend.h
View file

@ -34,8 +34,12 @@ struct wlr_backend {
* Automatically initializes the most suitable backend given the environment.
* Will always return a multi-backend. The backend is created but not started.
* Returns NULL on failure.
*
* If session_ptr is not NULL, it's populated with the session which has been
* created with the backend, if any.
*/
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display);
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
struct wlr_session **session_ptr);
/**
* Start the backend. This may signal new_input or new_output immediately, but
* may also wait until the display's event loop begins. Returns false on

2
tinywl/tinywl.c
View file

@ -828,7 +828,7 @@ int main(int argc, char *argv[]) {
* output hardware. The autocreate option will choose the most suitable
* backend based on the current environment, such as opening an X11 window
* if an X11 server is running. */
server.backend = wlr_backend_autocreate(server.wl_display);
server.backend = wlr_backend_autocreate(server.wl_display, NULL);
if (server.backend == NULL) {
wlr_log(WLR_ERROR, "failed to create wlr_backend");
return 1;