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#define _POSIX_C_SOURCE 200112L
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>
#include <wlr/backend/interface.h>
#include <wlr/types/wlr_buffer.h>
#include <wlr/util/log.h>
#include "backend/backend.h"
#include "backend/multi.h"
struct subbackend_state {
struct wlr_backend *backend;
struct wlr_backend *container;
struct wl_listener new_input;
struct wl_listener new_output;
struct wl_listener destroy;
struct wl_list link;
};
static struct wlr_multi_backend *multi_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_multi(wlr_backend));
struct wlr_multi_backend *backend = wl_container_of(wlr_backend, backend, backend);
return backend;
}
static bool multi_backend_start(struct wlr_backend *wlr_backend) {
struct wlr_multi_backend *backend = multi_backend_from_backend(wlr_backend);
struct subbackend_state *sub;
wl_list_for_each(sub, &backend->backends, link) {
if (!wlr_backend_start(sub->backend)) {
wlr_log(WLR_ERROR, "Failed to initialize backend.");
return false;
}
}
return true;
}
static void subbackend_state_destroy(struct subbackend_state *sub) {
wl_list_remove(&sub->new_input.link);
wl_list_remove(&sub->new_output.link);
wl_list_remove(&sub->destroy.link);
wl_list_remove(&sub->link);
free(sub);
}
static void multi_backend_destroy(struct wlr_backend *wlr_backend) {
struct wlr_multi_backend *backend = multi_backend_from_backend(wlr_backend);
wl_list_remove(&backend->event_loop_destroy.link);
wlr_backend_finish(wlr_backend);
// Some backends may depend on other backends, ie. destroying a backend may
// also destroy other backends
while (!wl_list_empty(&backend->backends)) {
struct subbackend_state *sub =
wl_container_of(backend->backends.next, sub, link);
wlr_backend_destroy(sub->backend);
}
free(backend);
}
static int multi_backend_get_drm_fd(struct wlr_backend *backend) {
struct wlr_multi_backend *multi = multi_backend_from_backend(backend);
struct subbackend_state *sub;
wl_list_for_each(sub, &multi->backends, link) {
if (sub->backend->impl->get_drm_fd) {
return wlr_backend_get_drm_fd(sub->backend);
}
}
return -1;
}
static uint32_t multi_backend_get_buffer_caps(struct wlr_backend *backend) {
struct wlr_multi_backend *multi = multi_backend_from_backend(backend);
if (wl_list_empty(&multi->backends)) {
return 0;
}
uint32_t caps = WLR_BUFFER_CAP_DATA_PTR | WLR_BUFFER_CAP_DMABUF
| WLR_BUFFER_CAP_SHM;
struct subbackend_state *sub;
wl_list_for_each(sub, &multi->backends, link) {
uint32_t backend_caps = backend_get_buffer_caps(sub->backend);
if (backend_caps != 0) {
// only count backend capable of presenting a buffer
caps = caps & backend_caps;
}
}
return caps;
}
static const struct wlr_backend_impl backend_impl = {
.start = multi_backend_start,
.destroy = multi_backend_destroy,
.get_drm_fd = multi_backend_get_drm_fd,
.get_buffer_caps = multi_backend_get_buffer_caps,
};
static void handle_event_loop_destroy(struct wl_listener *listener, void *data) {
struct wlr_multi_backend *backend =
wl_container_of(listener, backend, event_loop_destroy);
multi_backend_destroy((struct wlr_backend*)backend);
}
struct wlr_backend *wlr_multi_backend_create(struct wl_event_loop *loop) {
struct wlr_multi_backend *backend = calloc(1, sizeof(*backend));
if (!backend) {
wlr_log(WLR_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->event_loop_destroy.notify = handle_event_loop_destroy;
wl_event_loop_add_destroy_listener(loop, &backend->event_loop_destroy);
return &backend->backend;
}
bool wlr_backend_is_multi(struct wlr_backend *b) {
return b->impl == &backend_impl;
}
static void new_input_reemit(struct wl_listener *listener, void *data) {
struct subbackend_state *state = wl_container_of(listener,
state, new_input);
wl_signal_emit_mutable(&state->container->events.new_input, data);
}
static void new_output_reemit(struct wl_listener *listener, void *data) {
struct subbackend_state *state = wl_container_of(listener,
state, new_output);
wl_signal_emit_mutable(&state->container->events.new_output, data);
}
static void handle_subbackend_destroy(struct wl_listener *listener,
void *data) {
struct subbackend_state *state = wl_container_of(listener, state, 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;
}
bool wlr_multi_backend_add(struct wlr_backend *_multi,
struct wlr_backend *backend) {
assert(_multi && backend);
assert(_multi != backend);
struct wlr_multi_backend *multi = multi_backend_from_backend(_multi);
if (multi_backend_get_subbackend(multi, backend)) {
// already added
return true;
}
struct subbackend_state *sub = calloc(1, sizeof(*sub));
if (sub == NULL) {
wlr_log(WLR_ERROR, "Could not add backend: allocation failed");
return false;
}
wl_list_insert(multi->backends.prev, &sub->link);
sub->backend = backend;
sub->container = &multi->backend;
wl_signal_add(&backend->events.destroy, &sub->destroy);
sub->destroy.notify = handle_subbackend_destroy;
wl_signal_add(&backend->events.new_input, &sub->new_input);
sub->new_input.notify = new_input_reemit;
wl_signal_add(&backend->events.new_output, &sub->new_output);
sub->new_output.notify = new_output_reemit;
wl_signal_emit_mutable(&multi->events.backend_add, backend);
return true;
}
void wlr_multi_backend_remove(struct wlr_backend *_multi,
struct wlr_backend *backend) {
struct wlr_multi_backend *multi = multi_backend_from_backend(_multi);
struct subbackend_state *sub =
multi_backend_get_subbackend(multi, backend);
if (sub) {
wl_signal_emit_mutable(&multi->events.backend_remove, backend);
subbackend_state_destroy(sub);
}
}
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;
}
void wlr_multi_for_each_backend(struct wlr_backend *_backend,
void (*callback)(struct wlr_backend *backend, void *data), void *data) {
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) {
callback(sub->backend, data);
}
}
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