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#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/session.h>
#include <wlr/util/log.h>
#include "backend/multi.h"
#include "backend/drm/drm.h"
struct subbackend_state {
struct wlr_backend *backend;
struct wlr_backend *container;
struct wl_listener input_add;
struct wl_listener input_remove;
struct wl_listener output_add;
struct wl_listener output_remove;
struct wl_listener backend_destroy;
struct wl_list link;
};
static bool multi_backend_start(struct wlr_backend *wlr_backend) {
struct wlr_multi_backend *backend = (struct wlr_multi_backend *)wlr_backend;
struct subbackend_state *sub;
wl_list_for_each(sub, &backend->backends, link) {
if (!wlr_backend_start(sub->backend)) {
wlr_log(L_ERROR, "Failed to initialize backend.");
return false;
}
}
return true;
}
static void subbackend_state_destroy(struct subbackend_state *sub) {
wl_list_remove(&sub->input_add.link);
wl_list_remove(&sub->input_remove.link);
wl_list_remove(&sub->output_add.link);
wl_list_remove(&sub->output_remove.link);
wl_list_remove(&sub->backend_destroy.link);
wl_list_remove(&sub->link);
free(sub);
}
static void multi_backend_destroy(struct wlr_backend *wlr_backend) {
struct wlr_multi_backend *backend = (struct wlr_multi_backend *)wlr_backend;
wl_list_remove(&backend->display_destroy.link);
struct subbackend_state *sub, *next;
wl_list_for_each_safe(sub, next, &backend->backends, link) {
wlr_backend_destroy(sub->backend);
}
free(backend);
}
static struct wlr_egl *multi_backend_get_egl(struct wlr_backend *wlr_backend) {
struct wlr_multi_backend *backend = (struct wlr_multi_backend *)wlr_backend;
struct subbackend_state *sub;
wl_list_for_each(sub, &backend->backends, link) {
struct wlr_egl *egl = wlr_backend_get_egl(sub->backend);
if (egl) {
return egl;
}
}
return NULL;
}
struct wlr_backend_impl backend_impl = {
.start = multi_backend_start,
.destroy = multi_backend_destroy,
.get_egl = multi_backend_get_egl,
};
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_multi_backend *backend =
wl_container_of(listener, backend, display_destroy);
multi_backend_destroy((struct wlr_backend*)backend);
}
struct wlr_backend *wlr_multi_backend_create(struct wl_display *display) {
struct wlr_multi_backend *backend =
calloc(1, sizeof(struct wlr_multi_backend));
if (!backend) {
wlr_log(L_ERROR, "Backend allocation failed");
return NULL;
}
wl_list_init(&backend->backends);
wlr_backend_init(&backend->backend, &backend_impl);
wl_signal_init(&backend->events.backend_add);
wl_signal_init(&backend->events.backend_remove);
backend->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->display_destroy);
return &backend->backend;
}
bool wlr_backend_is_multi(struct wlr_backend *b) {
return b->impl == &backend_impl;
}
static void input_add_reemit(struct wl_listener *listener, void *data) {
struct subbackend_state *state = wl_container_of(listener,
state, input_add);
wl_signal_emit(&state->container->events.input_add, data);
}
static void input_remove_reemit(struct wl_listener *listener, void *data) {
struct subbackend_state *state = wl_container_of(listener,
state, input_remove);
wl_signal_emit(&state->container->events.input_remove, data);
}
static void output_add_reemit(struct wl_listener *listener, void *data) {
struct subbackend_state *state = wl_container_of(listener,
state, output_add);
wl_signal_emit(&state->container->events.output_add, data);
}
static void output_remove_reemit(struct wl_listener *listener, void *data) {
struct subbackend_state *state = wl_container_of(listener,
state, output_remove);
wl_signal_emit(&state->container->events.output_remove, data);
}
static void handle_subbackend_destroy(struct wl_listener *listener,
void *data) {
struct subbackend_state *state = wl_container_of(listener,
state, backend_destroy);
subbackend_state_destroy(state);
}
static struct subbackend_state *multi_backend_get_subbackend(struct wlr_multi_backend *multi,
struct wlr_backend *backend) {
struct subbackend_state *sub = NULL;
wl_list_for_each(sub, &multi->backends, link) {
if (sub->backend == backend) {
return sub;
}
}
return NULL;
}
void wlr_multi_backend_add(struct wlr_backend *_multi,
struct wlr_backend *backend) {
assert(wlr_backend_is_multi(_multi));
struct wlr_multi_backend *multi = (struct wlr_multi_backend *)_multi;
if (multi_backend_get_subbackend(multi, backend)) {
// already added
return;
}
struct subbackend_state *sub;
if (!(sub = calloc(1, sizeof(struct subbackend_state)))) {
wlr_log(L_ERROR, "Could not add backend: allocation failed");
return;
}
wl_list_insert(&multi->backends, &sub->link);
sub->backend = backend;
sub->container = &multi->backend;
wl_signal_add(&backend->events.destroy, &sub->backend_destroy);
sub->backend_destroy.notify = handle_subbackend_destroy;
wl_signal_add(&backend->events.input_add, &sub->input_add);
sub->input_add.notify = input_add_reemit;
wl_signal_add(&backend->events.input_remove, &sub->input_remove);
sub->input_remove.notify = input_remove_reemit;
wl_signal_add(&backend->events.output_add, &sub->output_add);
sub->output_add.notify = output_add_reemit;
wl_signal_add(&backend->events.output_remove, &sub->output_remove);
sub->output_remove.notify = output_remove_reemit;
wl_signal_emit(&multi->events.backend_add, backend);
}
void wlr_multi_backend_remove(struct wlr_backend *_multi,
struct wlr_backend *backend) {
assert(wlr_backend_is_multi(_multi));
struct wlr_multi_backend *multi = (struct wlr_multi_backend *)_multi;
struct subbackend_state *sub =
multi_backend_get_subbackend(multi, backend);
if (sub) {
wl_signal_emit(&multi->events.backend_remove, backend);
subbackend_state_destroy(sub);
}
}
struct wlr_session *wlr_multi_get_session(struct wlr_backend *_backend) {
assert(wlr_backend_is_multi(_backend));
struct wlr_multi_backend *backend = (struct wlr_multi_backend *)_backend;
struct subbackend_state *sub;
wl_list_for_each(sub, &backend->backends, link) {
if (wlr_backend_is_drm(sub->backend)) {
return wlr_drm_backend_get_session(sub->backend);
}
}
return NULL;
}
bool wlr_multi_is_empty(struct wlr_backend *_backend) {
assert(wlr_backend_is_multi(_backend));
struct wlr_multi_backend *backend = (struct wlr_multi_backend *)_backend;
return wl_list_length(&backend->backends) < 1;
}
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