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#include <stdlib.h>
#include <stdint.h>
#include <assert.h>
#include <limits.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <wayland-server.h>
#include <wlr/render/egl.h>
#include <wlr/backend/interface.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/interfaces/wlr_input_device.h>
#include <wlr/util/log.h>
#include "backend/wayland.h"
#include "xdg-shell-unstable-v6-client-protocol.h"
static int dispatch_events(int fd, uint32_t mask, void *data) {
struct wlr_wl_backend *backend = data;
int count = 0;
if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) {
wl_display_terminate(backend->local_display);
return 0;
}
if (mask & WL_EVENT_READABLE) {
count = wl_display_dispatch(backend->remote_display);
}
if (mask == 0) {
count = wl_display_dispatch_pending(backend->remote_display);
wl_display_flush(backend->remote_display);
}
return count;
}
/*
* Initializes the wayland backend. Opens a connection to a remote wayland
* compositor and creates surfaces for each output, then registers globals on
* the specified display.
*/
static bool wlr_wl_backend_start(struct wlr_backend *_backend) {
struct wlr_wl_backend *backend = (struct wlr_wl_backend *)_backend;
wlr_log(L_INFO, "Initializating wayland backend");
wlr_wl_registry_poll(backend);
if (!backend->compositor || !backend->shell) {
wlr_log_errno(L_ERROR, "Could not obtain retrieve required globals");
return false;
}
backend->started = true;
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;
}
static void wlr_wl_backend_destroy(struct wlr_backend *_backend) {
struct wlr_wl_backend *backend = (struct wlr_wl_backend *)_backend;
if (!_backend) {
return;
}
struct wlr_wl_backend_output *output, *tmp_output;
wl_list_for_each_safe(output, tmp_output, &backend->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
struct wlr_input_device *input_device, *tmp_input_device;
wl_list_for_each_safe(input_device, tmp_input_device, &backend->devices, link) {
wlr_input_device_destroy(input_device);
}
wl_list_remove(&backend->local_display_destroy.link);
free(backend->seat_name);
wl_event_source_remove(backend->remote_display_src);
wlr_egl_finish(&backend->egl);
if (backend->seat) {
wl_seat_destroy(backend->seat);
}
if (backend->shm) {
wl_shm_destroy(backend->shm);
}
if (backend->shell) {
zxdg_shell_v6_destroy(backend->shell);
}
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_egl *wlr_wl_backend_get_egl(struct wlr_backend *_backend) {
struct wlr_wl_backend *backend = (struct wlr_wl_backend *)_backend;
return &backend->egl;
}
static struct wlr_backend_impl backend_impl = {
.start = wlr_wl_backend_start,
.destroy = wlr_wl_backend_destroy,
.get_egl = wlr_wl_backend_get_egl
};
bool wlr_backend_is_wl(struct wlr_backend *b) {
return b->impl == &backend_impl;
}
struct wlr_wl_backend_output *wlr_wl_output_for_surface(
struct wlr_wl_backend *backend, struct wl_surface *surface) {
struct wlr_wl_backend_output *output;
wl_list_for_each(output, &backend->outputs, link) {
if (output->surface == surface) {
return output;
}
}
return NULL;
}
void wlr_wl_output_layout_get_box(struct wlr_wl_backend *backend,
struct wlr_box *box) {
int min_x = INT_MAX, min_y = INT_MAX;
int max_x = INT_MIN, max_y = INT_MIN;
struct wlr_wl_backend_output *output;
wl_list_for_each(output, &backend->outputs, link) {
struct wlr_output *wlr_output = &output->wlr_output;
int width, height;
wlr_output_effective_resolution(wlr_output, &width, &height);
if (wlr_output->lx < min_x) {
min_x = wlr_output->lx;
}
if (wlr_output->ly < min_y) {
min_y = wlr_output->ly;
}
if (wlr_output->lx + width > max_x) {
max_x = wlr_output->lx + width;
}
if (wlr_output->ly + height > max_y) {
max_y = wlr_output->ly + height;
}
}
box->x = min_x;
box->y = min_y;
box->width = max_x - min_x;
box->height = max_y - min_y;
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_wl_backend *backend =
wl_container_of(listener, backend, local_display_destroy);
wlr_wl_backend_destroy(&backend->backend);
}
struct wlr_backend *wlr_wl_backend_create(struct wl_display *display, const char *remote) {
wlr_log(L_INFO, "Creating wayland backend");
struct wlr_wl_backend *backend = calloc(1, sizeof(struct wlr_wl_backend));
if (!backend) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
return NULL;
}
wlr_backend_init(&backend->backend, &backend_impl);
wl_list_init(&backend->devices);
wl_list_init(&backend->outputs);
backend->local_display = display;
backend->remote_display = wl_display_connect(remote);
if (!backend->remote_display) {
wlr_log_errno(L_ERROR, "Could not connect to remote display");
return false;
}
if (!(backend->registry = wl_display_get_registry(backend->remote_display))) {
wlr_log_errno(L_ERROR, "Could not obtain reference to remote registry");
return false;
}
wlr_egl_init(&backend->egl, EGL_PLATFORM_WAYLAND_EXT,
backend->remote_display, NULL, WL_SHM_FORMAT_ARGB8888);
wlr_egl_bind_display(&backend->egl, backend->local_display);
backend->local_display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->local_display_destroy);
return &backend->backend;
}
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