examples/embedded: new example

examples/embedded.c

@@ -0,0 +1,184 @@
+#define _POSIX_C_SOURCE 200112L
+#include <GLES2/gl2.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wayland-client.h>
+#include <wayland-egl.h>
+#include <wayland-server.h>
+#include <wlr/backend/wayland.h>
+#include <wlr/render/allocator.h>
+#include <wlr/types/wlr_compositor.h>
+#include <wlr/types/wlr_scene.h>
+#include <wlr/types/wlr_xdg_shell.h>
+#include <wlr/util/log.h>
+
+#include "egl_common.h"
+#include "xdg-shell-client-protocol.h"
+
+static struct wl_display *remote_display = NULL;
+static struct wl_compositor *compositor = NULL;
+static struct wl_subcompositor *subcompositor = NULL;
+static struct xdg_wm_base *wm_base = NULL;
+
+static struct wl_egl_window *egl_window = NULL;
+static struct wlr_egl_surface *egl_surface = NULL;
+static struct wl_surface *main_surface = NULL;
+static struct wl_callback *frame_callback = NULL;
+
+static struct wlr_scene *scene = NULL;
+static struct wlr_scene_output *scene_output = NULL;
+static struct wl_listener new_surface = {0};
+static struct wl_listener output_frame = {0};
+
+int width = 500;
+int height = 500;
+
+static void draw_main_surface(void);
+
+static void frame_handle_done(void *data, struct wl_callback *callback, uint32_t t) {
+	wl_callback_destroy(callback);
+	frame_callback = NULL;
+	draw_main_surface();
+}
+
+static const struct wl_callback_listener frame_listener = {
+	.done = frame_handle_done,
+};
+
+static void draw_main_surface(void) {
+	frame_callback = wl_surface_frame(main_surface);
+	wl_callback_add_listener(frame_callback, &frame_listener, NULL);
+
+	eglMakeCurrent(egl_display, egl_surface, egl_surface, egl_context);
+	eglSwapInterval(egl_display, 0);
+
+	glViewport(0, 0, width, height);
+	glClearColor(1, 0, 0, 1);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	eglSwapBuffers(egl_display, egl_surface);
+	wl_display_flush(remote_display);
+}
+
+static void xdg_surface_handle_configure(void *data,
+		struct xdg_surface *xdg_surface, uint32_t serial) {
+	xdg_surface_ack_configure(xdg_surface, serial);
+	if (frame_callback == NULL) {
+		draw_main_surface();
+	}
+}
+
+static const struct xdg_surface_listener xdg_surface_listener = {
+	.configure = xdg_surface_handle_configure,
+};
+
+static void xdg_toplevel_handle_configure(void *data,
+		struct xdg_toplevel *xdg_toplevel, int32_t w, int32_t h,
+		struct wl_array *states) {
+	if (w != 0 && h != 0) {
+		width = w;
+		height = h;
+	}
+}
+
+static const struct xdg_toplevel_listener xdg_toplevel_listener = {
+	.configure = xdg_toplevel_handle_configure,
+};
+
+static void handle_global(void *data, struct wl_registry *registry,
+		uint32_t name, const char *interface, uint32_t version) {
+	if (strcmp(interface, wl_compositor_interface.name) == 0) {
+		compositor = wl_registry_bind(registry, name, &wl_compositor_interface, 4);
+	} else if (strcmp(interface, wl_subcompositor_interface.name) == 0) {
+		subcompositor = wl_registry_bind(registry, name, &wl_subcompositor_interface, 1);
+	} else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
+		wm_base = wl_registry_bind(registry, name, &xdg_wm_base_interface, 1);
+	}
+}
+
+static void handle_global_remove(void *data, struct wl_registry *registry,
+		uint32_t name) {
+	// Who cares?
+}
+
+static const struct wl_registry_listener registry_listener = {
+	.global = handle_global,
+	.global_remove = handle_global_remove,
+};
+
+static void output_handle_frame(struct wl_listener *listener, void *data) {
+	wlr_scene_output_commit(scene_output, NULL);
+
+	struct timespec now;
+	clock_gettime(CLOCK_MONOTONIC, &now);
+	wlr_scene_output_send_frame_done(scene_output, &now);
+}
+
+static void handle_new_surface(struct wl_listener *listener, void *data) {
+	struct wlr_surface *wlr_surface = data;
+	wlr_scene_surface_create(&scene->tree, wlr_surface);
+}
+
+int main(int argc, char *argv[]) {
+	wlr_log_init(WLR_DEBUG, NULL);
+
+	remote_display = wl_display_connect(NULL);
+	struct wl_registry *registry = wl_display_get_registry(remote_display);
+	wl_registry_add_listener(registry, &registry_listener, NULL);
+	wl_display_roundtrip(remote_display);
+
+	egl_init(remote_display);
+
+	struct wl_display *local_display = wl_display_create();
+	struct wlr_backend *backend = wlr_wl_backend_create(local_display, remote_display);
+	struct wlr_renderer *renderer = wlr_renderer_autocreate(backend);
+	wlr_renderer_init_wl_display(renderer, local_display);
+	struct wlr_allocator *allocator = wlr_allocator_autocreate(backend, renderer);
+	scene = wlr_scene_create();
+	struct wlr_compositor *wlr_compositor = wlr_compositor_create(local_display, 5, renderer);
+
+	wlr_xdg_shell_create(local_display, 2);
+
+	new_surface.notify = handle_new_surface;
+	wl_signal_add(&wlr_compositor->events.new_surface, &new_surface);
+
+	wlr_backend_start(backend);
+
+	main_surface = wl_compositor_create_surface(compositor);
+	struct xdg_surface *xdg_surface = xdg_wm_base_get_xdg_surface(wm_base, main_surface);
+	struct xdg_toplevel *xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
+	xdg_surface_add_listener(xdg_surface, &xdg_surface_listener, NULL);
+	xdg_toplevel_add_listener(xdg_toplevel, &xdg_toplevel_listener, NULL);
+
+	egl_window = wl_egl_window_create(main_surface, width, height);
+	egl_surface = eglCreatePlatformWindowSurfaceEXT(egl_display,
+		egl_config, egl_window, NULL);
+
+	struct wl_surface *child_surface = wl_compositor_create_surface(compositor);
+	struct wl_subsurface *subsurface = wl_subcompositor_get_subsurface(subcompositor, child_surface, main_surface);
+	wl_subsurface_set_position(subsurface, 20, 20);
+	struct wlr_output *output = wlr_wl_output_create_from_surface(backend, child_surface);
+	wlr_output_init_render(output, allocator, renderer);
+	scene_output = wlr_scene_output_create(scene, output);
+
+	output_frame.notify = output_handle_frame;
+	wl_signal_add(&output->events.frame, &output_frame);
+
+	struct wlr_output_state state;
+	wlr_output_state_init(&state);
+	wlr_output_state_set_enabled(&state, true);
+	wlr_output_commit_state(output, &state);
+	wlr_output_state_finish(&state);
+
+	wl_surface_commit(main_surface);
+	wl_display_flush(remote_display);
+
+	const char *socket = wl_display_add_socket_auto(local_display);
+	setenv("WAYLAND_DISPLAY", socket, true);
+	wlr_log(WLR_INFO, "Running embedded Wayland compositor on WAYLAND_DISPLAY=%s", socket);
+
+	wl_display_run(local_display);
+
+	return 0;
+}

examples/meson.build

@@ -223,3 +223,14 @@ foreach name, info : clients
 		build_by_default: get_option('examples'),
 	)
 endforeach
+
+executable(
+	'embedded',
+	[
+		'embedded.c',
+		'egl_common.c',
+		protocols_code['xdg-shell'],
+		protocols_client_header['xdg-shell'],
+	],
+	dependencies: [wlroots, wayland_client, wayland_egl, egl, glesv2],
+)