From c3d969d2d43789167f2cc69cc040219fbdd3e7a1 Mon Sep 17 00:00:00 2001 From: Simon Ser Date: Thu, 18 Aug 2022 15:55:47 +0200 Subject: [PATCH] examples/output-layers: new example --- examples/meson.build | 6 + examples/output-layers.c | 292 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 298 insertions(+) create mode 100644 examples/output-layers.c diff --git a/examples/meson.build b/examples/meson.build index 51e7d3117..33216bdbd 100644 --- a/examples/meson.build +++ b/examples/meson.build @@ -57,6 +57,12 @@ compositors = { 'src': 'scene-graph.c', 'proto': ['xdg-shell'], }, + 'output-layers': { + 'src': 'output-layers.c', + 'proto': [ + 'xdg-shell', + ], + }, } clients = { diff --git a/examples/output-layers.c b/examples/output-layers.c new file mode 100644 index 000000000..bc03ea662 --- /dev/null +++ b/examples/output-layers.c @@ -0,0 +1,292 @@ +#define _POSIX_C_SOURCE 200112L +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* 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; +}