253 lines
7.4 KiB
C
253 lines
7.4 KiB
C
#define _POSIX_C_SOURCE 200112L
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#include <assert.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <time.h>
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#include <wlr/backend/interface.h>
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#include <wlr/backend/session.h>
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#include <wlr/types/wlr_buffer.h>
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#include <wlr/util/log.h>
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#include "backend/backend.h"
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#include "backend/multi.h"
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#include "util/signal.h"
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struct subbackend_state {
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struct wlr_backend *backend;
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struct wlr_backend *container;
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struct wl_listener new_input;
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struct wl_listener new_output;
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struct wl_listener destroy;
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struct wl_list link;
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};
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static struct wlr_multi_backend *multi_backend_from_backend(
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struct wlr_backend *wlr_backend) {
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assert(wlr_backend_is_multi(wlr_backend));
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return (struct wlr_multi_backend *)wlr_backend;
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}
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static bool multi_backend_start(struct wlr_backend *wlr_backend) {
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struct wlr_multi_backend *backend = multi_backend_from_backend(wlr_backend);
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struct subbackend_state *sub;
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wl_list_for_each(sub, &backend->backends, link) {
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if (!wlr_backend_start(sub->backend)) {
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wlr_log(WLR_ERROR, "Failed to initialize backend.");
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return false;
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}
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}
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return true;
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}
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static void subbackend_state_destroy(struct subbackend_state *sub) {
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wl_list_remove(&sub->new_input.link);
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wl_list_remove(&sub->new_output.link);
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wl_list_remove(&sub->destroy.link);
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wl_list_remove(&sub->link);
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free(sub);
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}
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static void multi_backend_destroy(struct wlr_backend *wlr_backend) {
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struct wlr_multi_backend *backend = multi_backend_from_backend(wlr_backend);
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wl_list_remove(&backend->display_destroy.link);
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// Some backends may depend on other backends, ie. destroying a backend may
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// also destroy other backends
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while (!wl_list_empty(&backend->backends)) {
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struct subbackend_state *sub =
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wl_container_of(backend->backends.next, sub, link);
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wlr_backend_destroy(sub->backend);
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}
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// Destroy this backend only after removing all sub-backends
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wlr_backend_finish(wlr_backend);
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free(backend);
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}
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static struct wlr_session *multi_backend_get_session(
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struct wlr_backend *_backend) {
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struct wlr_multi_backend *backend = multi_backend_from_backend(_backend);
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return backend->session;
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}
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static clockid_t multi_backend_get_presentation_clock(
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struct wlr_backend *backend) {
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struct wlr_multi_backend *multi = multi_backend_from_backend(backend);
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struct subbackend_state *sub;
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wl_list_for_each(sub, &multi->backends, link) {
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if (sub->backend->impl->get_presentation_clock) {
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return wlr_backend_get_presentation_clock(sub->backend);
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}
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}
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return CLOCK_MONOTONIC;
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}
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static int multi_backend_get_drm_fd(struct wlr_backend *backend) {
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struct wlr_multi_backend *multi = multi_backend_from_backend(backend);
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struct subbackend_state *sub;
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wl_list_for_each(sub, &multi->backends, link) {
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if (sub->backend->impl->get_drm_fd) {
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return wlr_backend_get_drm_fd(sub->backend);
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}
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}
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return -1;
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}
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static uint32_t multi_backend_get_buffer_caps(struct wlr_backend *backend) {
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struct wlr_multi_backend *multi = multi_backend_from_backend(backend);
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if (wl_list_empty(&multi->backends)) {
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return 0;
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}
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uint32_t caps = WLR_BUFFER_CAP_DATA_PTR | WLR_BUFFER_CAP_DMABUF
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| WLR_BUFFER_CAP_SHM;
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struct subbackend_state *sub;
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wl_list_for_each(sub, &multi->backends, link) {
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uint32_t backend_caps = backend_get_buffer_caps(sub->backend);
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if (backend_caps != 0) {
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// only count backend capable of presenting a buffer
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caps = caps & backend_caps;
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}
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}
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return caps;
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}
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static const struct wlr_backend_impl backend_impl = {
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.start = multi_backend_start,
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.destroy = multi_backend_destroy,
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.get_session = multi_backend_get_session,
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.get_presentation_clock = multi_backend_get_presentation_clock,
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.get_drm_fd = multi_backend_get_drm_fd,
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.get_buffer_caps = multi_backend_get_buffer_caps,
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};
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static void handle_display_destroy(struct wl_listener *listener, void *data) {
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struct wlr_multi_backend *backend =
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wl_container_of(listener, backend, display_destroy);
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multi_backend_destroy((struct wlr_backend*)backend);
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}
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struct wlr_backend *wlr_multi_backend_create(struct wl_display *display) {
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struct wlr_multi_backend *backend =
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calloc(1, sizeof(struct wlr_multi_backend));
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if (!backend) {
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wlr_log(WLR_ERROR, "Backend allocation failed");
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return NULL;
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}
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wl_list_init(&backend->backends);
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wlr_backend_init(&backend->backend, &backend_impl);
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wl_signal_init(&backend->events.backend_add);
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wl_signal_init(&backend->events.backend_remove);
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backend->display_destroy.notify = handle_display_destroy;
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wl_display_add_destroy_listener(display, &backend->display_destroy);
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return &backend->backend;
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}
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bool wlr_backend_is_multi(struct wlr_backend *b) {
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return b->impl == &backend_impl;
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}
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static void new_input_reemit(struct wl_listener *listener, void *data) {
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struct subbackend_state *state = wl_container_of(listener,
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state, new_input);
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wlr_signal_emit_safe(&state->container->events.new_input, data);
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}
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static void new_output_reemit(struct wl_listener *listener, void *data) {
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struct subbackend_state *state = wl_container_of(listener,
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state, new_output);
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wlr_signal_emit_safe(&state->container->events.new_output, data);
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}
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static void handle_subbackend_destroy(struct wl_listener *listener,
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void *data) {
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struct subbackend_state *state = wl_container_of(listener, state, destroy);
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subbackend_state_destroy(state);
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}
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static struct subbackend_state *multi_backend_get_subbackend(struct wlr_multi_backend *multi,
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struct wlr_backend *backend) {
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struct subbackend_state *sub = NULL;
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wl_list_for_each(sub, &multi->backends, link) {
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if (sub->backend == backend) {
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return sub;
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}
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}
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return NULL;
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}
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bool wlr_multi_backend_add(struct wlr_backend *_multi,
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struct wlr_backend *backend) {
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assert(_multi && backend);
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assert(_multi != backend);
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struct wlr_multi_backend *multi = multi_backend_from_backend(_multi);
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if (multi_backend_get_subbackend(multi, backend)) {
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// already added
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return true;
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}
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struct subbackend_state *sub = calloc(1, sizeof(struct subbackend_state));
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if (sub == NULL) {
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wlr_log(WLR_ERROR, "Could not add backend: allocation failed");
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return false;
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}
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wl_list_insert(multi->backends.prev, &sub->link);
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sub->backend = backend;
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sub->container = &multi->backend;
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wl_signal_add(&backend->events.destroy, &sub->destroy);
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sub->destroy.notify = handle_subbackend_destroy;
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wl_signal_add(&backend->events.new_input, &sub->new_input);
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sub->new_input.notify = new_input_reemit;
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wl_signal_add(&backend->events.new_output, &sub->new_output);
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sub->new_output.notify = new_output_reemit;
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wlr_signal_emit_safe(&multi->events.backend_add, backend);
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return true;
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}
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void wlr_multi_backend_remove(struct wlr_backend *_multi,
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struct wlr_backend *backend) {
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struct wlr_multi_backend *multi = multi_backend_from_backend(_multi);
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struct subbackend_state *sub =
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multi_backend_get_subbackend(multi, backend);
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if (sub) {
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wlr_signal_emit_safe(&multi->events.backend_remove, backend);
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subbackend_state_destroy(sub);
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}
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}
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bool wlr_multi_is_empty(struct wlr_backend *_backend) {
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assert(wlr_backend_is_multi(_backend));
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struct wlr_multi_backend *backend = (struct wlr_multi_backend *)_backend;
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return wl_list_length(&backend->backends) < 1;
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}
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void wlr_multi_for_each_backend(struct wlr_backend *_backend,
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void (*callback)(struct wlr_backend *backend, void *data), void *data) {
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assert(wlr_backend_is_multi(_backend));
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struct wlr_multi_backend *backend = (struct wlr_multi_backend *)_backend;
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struct subbackend_state *sub;
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wl_list_for_each(sub, &backend->backends, link) {
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callback(sub->backend, data);
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}
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}
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