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examples/output-layers: new example

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This commit is contained in:
Simon Ser 2022-08-18 15:55:47 +02:00
parent cd17b18495
commit c3d969d2d4
2 changed files with 298 additions and 0 deletions
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6
examples/meson.build
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@ -57,6 +57,12 @@ compositors = {
'src': 'scene-graph.c',
'proto': ['xdg-shell'],
},
'output-layers': {
'src': 'output-layers.c',
'proto': [
'xdg-shell',
],
},
}
clients = {

292
examples/output-layers.c Normal file
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@ -0,0 +1,292 @@
#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/allocator.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_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.
*
* New surfaces are stacked on top of the existing ones as they appear.
* Surfaces that don't make it into an output layer are rendered as usual. */
struct server {
struct wl_display *wl_display;
struct wlr_backend *backend;
struct wlr_renderer *renderer;
struct wlr_allocator *allocator;
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;
struct wlr_buffer *buffer;
bool first_commit, layer_accepted, 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;
struct wl_array layers_arr = {0};
struct output_surface *output_surface;
wl_list_for_each(output_surface, &output->surfaces, link) {
struct wlr_output_layer_state *layer_state =
wl_array_add(&layers_arr, sizeof(*layer_state));
*layer_state = (struct wlr_output_layer_state){
.layer = output_surface->layer,
.buffer = output_surface->buffer,
.x = output_surface->x,
.y = output_surface->y,
};
}
wlr_output_set_layers(output->wlr_output, layers_arr.data,
layers_arr.size / sizeof(struct wlr_output_layer_state));
if (!wlr_output_test(output->wlr_output)) {
wlr_log(WLR_ERROR, "wlr_output_test() failed");
return;
}
if (!wlr_output_attach_render(output->wlr_output, NULL)) {
wlr_log(WLR_ERROR, "wlr_output_attach_render() failed");
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 });
size_t i = 0;
struct wlr_output_layer_state *layers = layers_arr.data;
wl_list_for_each(output_surface, &output->surfaces, link) {
struct wlr_surface *wlr_surface = output_surface->wlr_surface;
output_surface->layer_accepted = layers[i].accepted;
i++;
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_INFO, "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_INFO, "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;
}
wl_array_release(&layers_arr);
}
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(*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 = 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 output_surface_handle_destroy(struct wl_listener *listener,
void *data) {
struct output_surface *output_surface =
wl_container_of(listener, output_surface, destroy);
wlr_buffer_unlock(output_surface->buffer);
wlr_output_layer_destroy(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 = wlr_buffer_lock(&output_surface->wlr_surface->buffer->base);
}
wlr_buffer_unlock(output_surface->buffer);
output_surface->buffer = 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(*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);
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_renderer_autocreate(server.backend);
wlr_renderer_init_wl_display(server.renderer, server.wl_display);
server.allocator = wlr_allocator_autocreate(server.backend,
server.renderer);
struct wlr_compositor *compositor =
wlr_compositor_create(server.wl_display, server.renderer);
wlr_xdg_shell_create(server.wl_display, 1);
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);
if (startup_cmd != NULL) {
if (fork() == 0) {
execlp("sh", "sh", "-c", startup_cmd, (char *)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;
}