Add xdg-decoration-unstable-v1 support

2 files changed, 259 insertions, 0 deletions

diff --git a/examples/meson.build b/examples/meson.build
index 18f44fde..26d20850 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -66,3 +66,9 @@ if libpng.found()
 		dependencies: [wayland_client, wlr_protos, wlroots, libpng]
 	)
 endif
+
+executable(
+	'toplevel-decoration',
+	'toplevel-decoration.c',
+	dependencies: [wayland_client, wlr_protos, wlroots]
+)
diff --git a/examples/toplevel-decoration.c b/examples/toplevel-decoration.c
new file mode 100644
index 00000000..e930c417
--- /dev/null
+++ b/examples/toplevel-decoration.c
@@ -0,0 +1,253 @@
+#include <GLES2/gl2.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <wayland-client.h>
+#include <wayland-egl.h>
+#include <wlr/render/egl.h>
+#include "xdg-shell-client-protocol.h"
+#include "xdg-decoration-unstable-v1-client-protocol.h"
+
+/**
+ * Usage: toplevel-decoration [mode]
+ * Creates an xdg-toplevel supporting decoration negotiation. If `mode` is
+ * specified, the client will prefer this decoration mode.
+ */
+
+static int width = 500, height = 300;
+
+static struct wl_compositor *compositor = NULL;
+static struct xdg_wm_base *wm_base = NULL;
+static struct zxdg_decoration_manager_v1 *decoration_manager = NULL;
+
+struct wlr_egl egl;
+struct wl_egl_window *egl_window;
+struct wlr_egl_surface *egl_surface;
+
+struct zxdg_toplevel_decoration_v1 *decoration;
+enum zxdg_toplevel_decoration_v1_mode client_preferred_mode, current_mode;
+
+static const char *get_mode_name(enum zxdg_toplevel_decoration_v1_mode mode) {
+	switch (mode) {
+	case ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE:
+		return "client-side decorations";
+	case ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE:
+		return "server-side decorations";
+	}
+	abort();
+}
+
+static void request_preferred_mode(void) {
+	enum zxdg_toplevel_decoration_v1_mode mode = client_preferred_mode;
+	if (mode == 0) {
+		printf("Requesting compositor preferred mode\n");
+		zxdg_toplevel_decoration_v1_unset_mode(decoration);
+		return;
+	}
+	if (mode == current_mode) {
+		return;
+	}
+
+	printf("Requesting %s\n", get_mode_name(mode));
+	zxdg_toplevel_decoration_v1_set_mode(decoration, mode);
+}
+
+static void draw(void) {
+	eglMakeCurrent(egl.display, egl_surface, egl_surface, egl.context);
+
+	float color[] = {1.0, 1.0, 0.0, 1.0};
+	if (current_mode == ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE) {
+		color[0] = 0.0;
+	}
+
+	glViewport(0, 0, width, height);
+	glClearColor(color[0], color[1], color[2], 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+
+	eglSwapBuffers(egl.display, egl_surface);
+}
+
+static void xdg_surface_handle_configure(void *data,
+		struct xdg_surface *xdg_surface, uint32_t serial) {
+	xdg_surface_ack_configure(xdg_surface, serial);
+	wl_egl_window_resize(egl_window, width, height, 0, 0);
+	draw();
+}
+
+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) {
+	width = w;
+	height = h;
+}
+
+static const struct xdg_toplevel_listener xdg_toplevel_listener = {
+	.configure = xdg_toplevel_handle_configure,
+};
+
+static void decoration_handle_configure(void *data,
+		struct zxdg_toplevel_decoration_v1 *decoration,
+		enum zxdg_toplevel_decoration_v1_mode mode) {
+	printf("Using %s\n", get_mode_name(mode));
+	current_mode = mode;
+}
+
+static const struct zxdg_toplevel_decoration_v1_listener decoration_listener = {
+	.configure = decoration_handle_configure,
+};
+
+static void pointer_handle_enter(void *data, struct wl_pointer *pointer,
+		uint32_t serial, struct wl_surface *surface,
+		wl_fixed_t sx, wl_fixed_t sy) {
+	// No-op
+}
+
+static void pointer_handle_leave(void *data, struct wl_pointer *pointer,
+		uint32_t serial, struct wl_surface *surface) {
+	// No-op
+}
+
+static void pointer_handle_motion(void *data, struct wl_pointer *pointer,
+		uint32_t time, wl_fixed_t sx, wl_fixed_t sy) {
+	// No-op
+}
+
+static void pointer_handle_button(void *data, struct wl_pointer *wl_pointer,
+		uint32_t serial, uint32_t time, uint32_t button,
+		enum wl_pointer_button_state state) {
+	if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
+		// Toggle mode
+		if (client_preferred_mode == ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE) {
+			client_preferred_mode = ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE;
+		} else {
+			client_preferred_mode = ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE;
+		}
+		request_preferred_mode();
+	}
+}
+
+static void pointer_handle_axis(void *data, struct wl_pointer *wl_pointer,
+		uint32_t time, enum wl_pointer_axis axis, wl_fixed_t value) {
+	// No-op
+}
+
+static const struct wl_pointer_listener pointer_listener = {
+	.enter = pointer_handle_enter,
+	.leave = pointer_handle_leave,
+	.motion = pointer_handle_motion,
+	.button = pointer_handle_button,
+	.axis = pointer_handle_axis,
+};
+
+static void seat_handle_capabilities(void *data, struct wl_seat *seat,
+		enum wl_seat_capability caps) {
+	if (caps & WL_SEAT_CAPABILITY_POINTER) {
+		struct wl_pointer *pointer = wl_seat_get_pointer(seat);
+		wl_pointer_add_listener(pointer, &pointer_listener, NULL);
+	}
+}
+
+static const struct wl_seat_listener seat_listener = {
+	.capabilities = seat_handle_capabilities,
+};
+
+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,
+			1);
+	} else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
+		wm_base = wl_registry_bind(registry, name, &xdg_wm_base_interface, 1);
+	} else if (strcmp(interface, zxdg_decoration_manager_v1_interface.name) == 0) {
+		decoration_manager = wl_registry_bind(registry, name,
+			&zxdg_decoration_manager_v1_interface, 1);
+	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
+		struct wl_seat *seat =
+			wl_registry_bind(registry, name, &wl_seat_interface, 1);
+		wl_seat_add_listener(seat, &seat_listener, NULL);
+	}
+}
+
+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,
+};
+
+int main(int argc, char **argv) {
+	if (argc == 2) {
+		char *mode = argv[1];
+		if (strcmp(mode, "client") == 0) {
+			client_preferred_mode = ZXDG_TOPLEVEL_DECORATION_V1_MODE_CLIENT_SIDE;
+		} else if (strcmp(mode, "server") == 0) {
+			client_preferred_mode = ZXDG_TOPLEVEL_DECORATION_V1_MODE_SERVER_SIDE;
+		} else {
+			fprintf(stderr, "Invalid decoration mode\n");
+			return EXIT_FAILURE;
+		}
+	}
+
+	struct wl_display *display = wl_display_connect(NULL);
+	if (display == NULL) {
+		fprintf(stderr, "Failed to create display\n");
+		return EXIT_FAILURE;
+	}
+
+	struct wl_registry *registry = wl_display_get_registry(display);
+	wl_registry_add_listener(registry, &registry_listener, NULL);
+	wl_display_dispatch(display);
+	wl_display_roundtrip(display);
+
+	if (compositor == NULL) {
+		fprintf(stderr, "wl-compositor not available\n");
+		return EXIT_FAILURE;
+	}
+	if (wm_base == NULL) {
+		fprintf(stderr, "xdg-shell not available\n");
+		return EXIT_FAILURE;
+	}
+	if (decoration_manager == NULL) {
+		fprintf(stderr, "xdg-decoration not available\n");
+		return EXIT_FAILURE;
+	}
+
+	wlr_egl_init(&egl, EGL_PLATFORM_WAYLAND_EXT, display, NULL,
+		WL_SHM_FORMAT_ARGB8888);
+
+	struct wl_surface *surface = wl_compositor_create_surface(compositor);
+	struct xdg_surface *xdg_surface =
+		xdg_wm_base_get_xdg_surface(wm_base, surface);
+	struct xdg_toplevel *xdg_toplevel = xdg_surface_get_toplevel(xdg_surface);
+	decoration = zxdg_decoration_manager_v1_get_toplevel_decoration(
+		decoration_manager, xdg_toplevel);
+
+	wl_display_roundtrip(display);
+	request_preferred_mode();
+
+	xdg_surface_add_listener(xdg_surface, &xdg_surface_listener, NULL);
+	xdg_toplevel_add_listener(xdg_toplevel, &xdg_toplevel_listener, NULL);
+	zxdg_toplevel_decoration_v1_add_listener(decoration, &decoration_listener,
+		NULL);
+	wl_surface_commit(surface);
+
+	egl_window = wl_egl_window_create(surface, width, height);
+	egl_surface = wlr_egl_create_surface(&egl, egl_window);
+
+	wl_display_roundtrip(display);
+
+	draw();
+
+	while (wl_display_dispatch(display) != -1) {
+		// This space is intentionally left blank
+	}
+
+	return EXIT_SUCCESS;
+}