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examples: add output-layers example
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This new example demonstrates how to use the wlr_output_layer API. It's
a compositor that displays all client surfaces using wlr_output_layer.
To test, one can for instance run:

    build/examples/output-layers -s 'weston-simple-dmabuf-egl & weston-simple-egl'

Under the Wayland backend (where layers work as long as clients use
DMA-BUFs), thsi should display two surfaces.
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@emersion
emersion committed May 6, 2020
1 parent 2d8fbca commit d47fc8d
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4 changes: 4 additions & 0 deletions examples/meson.build
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,10 @@ compositors = {
'src': 'fullscreen-shell.c',
'proto': ['fullscreen-shell-unstable-v1'],
},
'output-layers': {
'src': 'output-layers.c',
'proto': ['xdg-shell'],
},
}

clients = {
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258 changes: 258 additions & 0 deletions examples/output-layers.c
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@@ -0,0 +1,258 @@
#define _POSIX_C_SOURCE 200112L
#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/wlr_renderer.h>
#include <wlr/types/wlr_compositor.h>
#include <wlr/types/wlr_output.h>
#include <wlr/types/wlr_output_layer.h>
#include <wlr/types/wlr_surface.h>
#include <wlr/types/wlr_xdg_shell.h>
#include <wlr/util/log.h>

/* Simple compositor making use of the output layers API. The compositor will
* attempt to display client surfaces with output layers. Input is
* unimplemented. */

struct server {
struct wl_display *wl_display;
struct wlr_backend *backend;
struct wlr_renderer *renderer;

struct wl_list outputs;

struct wl_listener new_output;
struct wl_listener new_surface;
};

struct output_surface {
struct wlr_surface *wlr_surface;
struct wlr_output_layer *layer;
struct wl_list link;

int x, y;

bool first_commit, prev_layer_accepted;

struct wl_listener destroy;
struct wl_listener commit;
};

struct output {
struct wl_list link;
struct server *server;
struct wlr_output *wlr_output;
struct wl_list surfaces;

struct wl_listener frame;
};

static void output_handle_frame(struct wl_listener *listener, void *data) {
struct output *output =
wl_container_of(listener, output, frame);
struct wlr_renderer *renderer = output->server->renderer;

if (!wlr_output_test(output->wlr_output)) {
return;
}

if (!wlr_output_attach_render(output->wlr_output, NULL)) {
return;
}

int width, height;
wlr_output_effective_resolution(output->wlr_output, &width, &height);
wlr_renderer_begin(renderer, width, height);
wlr_renderer_clear(renderer, (float[4]){ 0.3, 0.3, 0.3, 1.0 });

struct output_surface *output_surface;
wl_list_for_each(output_surface, &output->surfaces, link) {
struct wlr_surface *wlr_surface = output_surface->wlr_surface;

if (wlr_surface->buffer == NULL || output_surface->layer->accepted) {
continue;
}

struct wlr_texture *texture = wlr_surface_get_texture(wlr_surface);
if (texture == NULL) {
continue;
}

wlr_render_texture(renderer, texture, output->wlr_output->transform_matrix,
output_surface->x, output_surface->y, 1.0);
}

wlr_renderer_end(renderer);

wlr_output_commit(output->wlr_output);

struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);

wl_list_for_each(output_surface, &output->surfaces, link) {
wlr_surface_send_frame_done(output_surface->wlr_surface, &now);

if (output_surface->wlr_surface->buffer == NULL) {
continue;
}

if ((output_surface->first_commit ||
!output_surface->prev_layer_accepted) &&
output_surface->layer->accepted) {
wlr_log(WLR_DEBUG, "Scanning out wlr_surface %p on output '%s'",
output_surface->wlr_surface, output->wlr_output->name);
}
if ((output_surface->first_commit ||
output_surface->prev_layer_accepted) &&
!output_surface->layer->accepted) {
wlr_log(WLR_DEBUG, "Cannot scan out wlr_surface %p on output '%s'",
output_surface->wlr_surface, output->wlr_output->name);
}
output_surface->prev_layer_accepted = output_surface->layer->accepted;
output_surface->first_commit = false;
}
}

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;

struct output *output =
calloc(1, sizeof(struct output));
output->wlr_output = wlr_output;
output->server = server;
wl_list_init(&output->surfaces);
output->frame.notify = output_handle_frame;
wl_signal_add(&wlr_output->events.frame, &output->frame);
wl_list_insert(&server->outputs, &output->link);

if (!wl_list_empty(&wlr_output->modes)) {
struct wlr_output_mode *mode =
wl_container_of(wlr_output->modes.prev, mode, link);
wlr_output_set_mode(wlr_output, mode);
wlr_output_commit(wlr_output);
}

wlr_output_create_global(wlr_output);
}

static void output_surface_handle_destroy(struct wl_listener *listener,
void *data) {
struct output_surface *output_surface =
wl_container_of(listener, output_surface, destroy);
wlr_output_layer_remove(output_surface->layer);
wl_list_remove(&output_surface->destroy.link);
wl_list_remove(&output_surface->commit.link);
wl_list_remove(&output_surface->link);
free(output_surface);
}

static void output_surface_handle_commit(struct wl_listener *listener,
void *data) {
struct output_surface *output_surface =
wl_container_of(listener, output_surface, commit);
struct wlr_buffer *buffer = NULL;
if (output_surface->wlr_surface->buffer != NULL) {
buffer = &output_surface->wlr_surface->buffer->base;
}
wlr_output_layer_attach_buffer(output_surface->layer, buffer);
}

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;

struct output *output;
wl_list_for_each(output, &server->outputs, link) {
struct output_surface *output_surface =
calloc(1, sizeof(struct output_surface));
output_surface->wlr_surface = wlr_surface;
output_surface->destroy.notify = output_surface_handle_destroy;
wl_signal_add(&wlr_surface->events.destroy, &output_surface->destroy);
output_surface->commit.notify = output_surface_handle_commit;
wl_signal_add(&wlr_surface->events.commit, &output_surface->commit);

output_surface->layer = wlr_output_layer_create(output->wlr_output);
int pos = 50 * wl_list_length(&output->surfaces);
wlr_output_layer_move(output_surface->layer, pos, pos);

output_surface->x = output_surface->y = pos;
output_surface->first_commit = true;

wl_list_insert(output->surfaces.prev, &output_surface->link);
}
}

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.wl_display = wl_display_create();
server.backend = wlr_backend_autocreate(server.wl_display, NULL);
server.renderer = wlr_backend_get_renderer(server.backend);
wlr_renderer_init_wl_display(server.renderer, server.wl_display);

struct wlr_compositor *compositor =
wlr_compositor_create(server.wl_display, server.renderer);

wlr_xdg_shell_create(server.wl_display);

wl_list_init(&server.outputs);

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.wl_display);
if (!socket) {
wl_display_destroy(server.wl_display);
return EXIT_FAILURE;
}

if (!wlr_backend_start(server.backend)) {
wl_display_destroy(server.wl_display);
return EXIT_FAILURE;
}

setenv("WAYLAND_DISPLAY", socket, true);
setenv("WAYLAND_DEBUG", "", 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.wl_display);

wl_display_destroy_clients(server.wl_display);
wl_display_destroy(server.wl_display);
return EXIT_SUCCESS;
}

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