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#define _POSIX_C_SOURCE 200112L
#include <assert.h>
#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <wayland-server-core.h>
#include <wlr/backend.h>
#include <wlr/render/allocator.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_compositor.h>
#include <wlr/types/wlr_output.h>
#include <wlr/types/wlr_scene.h>
#include <wlr/types/wlr_xdg_shell.h>
#include <wlr/util/log.h>
/* Simple compositor making use of the scene-graph API. Input is unimplemented.
*
* New surfaces are stacked on top of the existing ones as they appear. */
static const int border_width = 3;
struct server {
struct wl_display *display;
struct wlr_backend *backend;
struct wlr_renderer *renderer;
struct wlr_allocator *allocator;
struct wlr_scene *scene;
struct wl_list outputs;
struct wl_list surfaces;
struct wl_listener new_output;
struct wl_listener new_surface;
};
struct surface {
struct wlr_surface *wlr;
struct wlr_scene_surface *scene_surface;
struct wlr_scene_rect *border;
struct wl_list link;
struct wl_listener commit;
struct wl_listener destroy;
};
struct output {
struct wl_list link;
struct server *server;
struct wlr_output *wlr;
struct wlr_scene_output *scene_output;
struct wl_listener frame;
};
static void output_handle_frame(struct wl_listener *listener, void *data) {
struct output *output = wl_container_of(listener, output, frame);
if (!wlr_scene_output_commit(output->scene_output)) {
return;
}
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
struct surface *surface;
wl_list_for_each(surface, &output->server->surfaces, link) {
wlr_surface_send_frame_done(surface->wlr, &now);
}
}
static void server_handle_new_output(struct wl_listener *listener, void *data) {
struct server *server = wl_container_of(listener, server, new_output);
struct wlr_output *wlr_output = data;
wlr_output_init_render(wlr_output, server->allocator, server->renderer);
struct output *output =
calloc(1, sizeof(struct output));
output->wlr = wlr_output;
output->server = server;
output->frame.notify = output_handle_frame;
wl_signal_add(&wlr_output->events.frame, &output->frame);
wl_list_insert(&server->outputs, &output->link);
output->scene_output = wlr_scene_output_create(server->scene, wlr_output);
if (!wl_list_empty(&wlr_output->modes)) {
struct wlr_output_mode *mode = wlr_output_preferred_mode(wlr_output);
wlr_output_set_mode(wlr_output, mode);
wlr_output_commit(wlr_output);
}
wlr_output_create_global(wlr_output);
}
static void surface_handle_commit(struct wl_listener *listener, void *data) {
struct surface *surface = wl_container_of(listener, surface, commit);
wlr_scene_rect_set_size(surface->border,
surface->wlr->current.width + 2 * border_width,
surface->wlr->current.height + 2 * border_width);
}
static void surface_handle_destroy(struct wl_listener *listener, void *data) {
struct surface *surface = wl_container_of(listener, surface, destroy);
wlr_scene_node_destroy(&surface->scene_surface->node);
wlr_scene_node_destroy(&surface->border->node);
wl_list_remove(&surface->destroy.link);
wl_list_remove(&surface->link);
free(surface);
}
static void server_handle_new_surface(struct wl_listener *listener,
void *data) {
struct server *server = wl_container_of(listener, server, new_surface);
struct wlr_surface *wlr_surface = data;
int pos = 50 * wl_list_length(&server->surfaces);
struct surface *surface = calloc(1, sizeof(struct surface));
surface->wlr = wlr_surface;
surface->commit.notify = surface_handle_commit;
wl_signal_add(&wlr_surface->events.commit, &surface->commit);
surface->destroy.notify = surface_handle_destroy;
wl_signal_add(&wlr_surface->events.destroy, &surface->destroy);
/* Border dimensions will be set in surface.commit handler */
surface->border = wlr_scene_rect_create(&server->scene->node,
0, 0, (float[4]){ 0.5f, 0.5f, 0.5f, 1 });
wlr_scene_node_set_position(&surface->border->node, pos, pos);
surface->scene_surface =
wlr_scene_surface_create(&server->scene->node, wlr_surface);
wl_list_insert(server->surfaces.prev, &surface->link);
wlr_scene_node_set_position(&surface->scene_surface->node,
pos + border_width, pos + border_width);
}
int main(int argc, char *argv[]) {
wlr_log_init(WLR_DEBUG, NULL);
char *startup_cmd = NULL;
int c;
while ((c = getopt(argc, argv, "s:")) != -1) {
switch (c) {
case 's':
startup_cmd = optarg;
break;
default:
printf("usage: %s [-s startup-command]\n", argv[0]);
return EXIT_FAILURE;
}
}
if (optind < argc) {
printf("usage: %s [-s startup-command]\n", argv[0]);
return EXIT_FAILURE;
}
struct server server = {0};
server.display = wl_display_create();
server.backend = wlr_backend_autocreate(server.display);
server.scene = wlr_scene_create();
server.renderer = wlr_renderer_autocreate(server.backend);
wlr_renderer_init_wl_display(server.renderer, server.display);
server.allocator = wlr_allocator_autocreate(server.backend,
server.renderer);
struct wlr_compositor *compositor =
wlr_compositor_create(server.display, server.renderer);
wlr_xdg_shell_create(server.display);
wl_list_init(&server.outputs);
wl_list_init(&server.surfaces);
server.new_output.notify = server_handle_new_output;
wl_signal_add(&server.backend->events.new_output, &server.new_output);
server.new_surface.notify = server_handle_new_surface;
wl_signal_add(&compositor->events.new_surface, &server.new_surface);
const char *socket = wl_display_add_socket_auto(server.display);
if (!socket) {
wl_display_destroy(server.display);
return EXIT_FAILURE;
}
if (!wlr_backend_start(server.backend)) {
wl_display_destroy(server.display);
return EXIT_FAILURE;
}
setenv("WAYLAND_DISPLAY", socket, true);
if (startup_cmd != NULL) {
if (fork() == 0) {
execl("/bin/sh", "/bin/sh", "-c", startup_cmd, (void *)NULL);
}
}
wlr_log(WLR_INFO, "Running Wayland compositor on WAYLAND_DISPLAY=%s",
socket);
wl_display_run(server.display);
wl_display_destroy_clients(server.display);
wl_display_destroy(server.display);
return EXIT_SUCCESS;
}
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