wayland-client-sample.c

#define _POSIX_C_SOURCE 200112L
#include <errno.h>
#include <assert.h>
#include <stdio.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <math.h>
#include <string.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <linux/input.h>
#include <wayland-client.h>
#include <xkbcommon/xkbcommon.h>
#include <wayland-cursor.h>
#include "xdg-shell-client-protocol.h"

/* Shared memory support code */
static void
randname(char *buf)
{
    struct timespec ts;
    clock_gettime(CLOCK_REALTIME, &ts);
    long r = ts.tv_nsec;
    for (int i = 0; i < 6; ++i) {
        buf[i] = 'A'+(r&15)+(r&16)*2;
        r >>= 5;
    }
}

static int
create_shm_file(void)
{
    int retries = 100;
    do {
        char name[] = "/wl_shm-XXXXXX";
        randname(name + sizeof(name) - 7);
        --retries;
        int fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
        if (fd >= 0) {
            shm_unlink(name);
            return fd;
        }
    } while (retries > 0 && errno == EEXIST);
    return -1;
}

static int
allocate_shm_file(size_t size)
{
    int fd = create_shm_file();
    if (fd < 0)
        return -1;
    int ret;
    do {
        ret = ftruncate(fd, size);
    } while (ret < 0 && errno == EINTR);
    if (ret < 0) {
        close(fd);
        return -1;
    }
    return fd;
}

enum pointer_event_mask {
       POINTER_EVENT_ENTER = 1 << 0,
       POINTER_EVENT_LEAVE = 1 << 1,
       POINTER_EVENT_MOTION = 1 << 2,
       POINTER_EVENT_BUTTON = 1 << 3,
       POINTER_EVENT_AXIS = 1 << 4,
       POINTER_EVENT_AXIS_SOURCE = 1 << 5,
       POINTER_EVENT_AXIS_STOP = 1 << 6,
       POINTER_EVENT_AXIS_DISCRETE = 1 << 7,
};

struct pointer_event {
       uint32_t event_mask;
       wl_fixed_t surface_x, surface_y;
       uint32_t button, state;
       uint32_t time;
       uint32_t serial;
       struct {
               bool valid;
               wl_fixed_t value;
               int32_t discrete;
       } axes[2];
       uint32_t axis_source;
};


/* Wayland code */
struct client_state {
    /* Globals */
    struct wl_display *wl_display;
    struct wl_registry *wl_registry;
    struct wl_region *wl_region;
    struct wl_shm *wl_shm;
    struct wl_compositor *wl_compositor;
    struct xdg_wm_base *xdg_wm_base;
    struct wl_seat *wl_seat;
    /* Objects */
    struct wl_surface *wl_surface;
    struct xdg_surface *xdg_surface;
    struct wl_keyboard *wl_keyboard;
    struct wl_pointer *wl_pointer;
	struct wl_touch *wl_touch;
    struct xdg_toplevel *xdg_toplevel;
	/* State */
	float offset;
	uint32_t last_frame;
	int width, height;
    bool closed;
	struct pointer_event pointer_event;
    uint32_t pointer_x;
    uint32_t pointer_y;
	struct xkb_state *xkb_state;
	struct xkb_context *xkb_context;
	struct xkb_keymap *xkb_keymap;
};

static void
wl_buffer_release(void *data, struct wl_buffer *wl_buffer)
{
    /* Sent by the compositor when it's no longer using this buffer */
    wl_buffer_destroy(wl_buffer);
}

static const struct wl_buffer_listener wl_buffer_listener = {
    .release = wl_buffer_release,
};

int _max ( int a, int b ) { return a > b ? a : b; }
int _min ( int a, int b ) { return a < b ? a : b; }

static struct wl_buffer *
draw_frame(struct client_state *state)
{
    int width = state->width, height = state->height;
    int stride = width * 4;
    int size = stride * height;

    int fd = allocate_shm_file(size);
    if (fd == -1) {
        return NULL;
    }

    uint32_t *data = mmap(NULL, size,
            PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if (data == MAP_FAILED) {
        close(fd);
        return NULL;
    }

    struct wl_shm_pool *pool = wl_shm_create_pool(state->wl_shm, fd, size);
    struct wl_buffer *buffer = wl_shm_pool_create_buffer(pool, 0,
            width, height, stride, WL_SHM_FORMAT_ARGB8888);
    wl_shm_pool_destroy(pool);
    close(fd);

    /* Draw checkerboxed background */
    int offset = (int)state->offset % 8;
    for (int y = 0; y < height; ++y) {
        for (int x = 0; x < width; ++x) {

			if (x > _max(0,state->pointer_x-10) && x < state->pointer_x+10 &&
			 y > _max(0, state->pointer_y-10) && y < state->pointer_y+10) {
				data[y * width + x] = 0xFF0000FF;
			} else
            if (((x + offset) + (y + offset) / 8 * 8) % 16 < 8)
                data[y * width + x] = 0xC0666666;
            else
                data[y * width + x] = 0xFFEEEEEE;
                
			
        }
    }

    munmap(data, size);
    wl_buffer_add_listener(buffer, &wl_buffer_listener, NULL);
    return buffer;
}

static void
xdg_toplevel_configure(void *data,
		struct xdg_toplevel *xdg_toplevel, int32_t width, int32_t height,
		struct wl_array *states)
{
	struct client_state *state = data;
	if (width == 0 || height == 0) {
		/* Compositor is deferring to us */
		return;
	}
	state->width = width;
	state->height = height;
}

static void
xdg_toplevel_close(void *data, struct xdg_toplevel *toplevel)
{
	struct client_state *state = data;
	state->closed = true;
}

static const struct xdg_toplevel_listener xdg_toplevel_listener = {
	.configure = xdg_toplevel_configure,
	.close = xdg_toplevel_close,
};


static void
xdg_surface_configure(void *data,
        struct xdg_surface *xdg_surface, uint32_t serial)
{
    struct client_state *state = data;
    xdg_surface_ack_configure(xdg_surface, serial);

    struct wl_buffer *buffer = draw_frame(state);
    wl_surface_attach(state->wl_surface, buffer, 0, 0);
    wl_surface_commit(state->wl_surface);
}

static const struct xdg_surface_listener xdg_surface_listener = {
    .configure = xdg_surface_configure,
};

static void
xdg_wm_base_ping(void *data, struct xdg_wm_base *xdg_wm_base, uint32_t serial)
{
    xdg_wm_base_pong(xdg_wm_base, serial);
}

static const struct xdg_wm_base_listener xdg_wm_base_listener = {
    .ping = xdg_wm_base_ping,
};

static const struct wl_callback_listener wl_surface_frame_listener;

static void
wl_surface_frame_done(void *data, struct wl_callback *cb, uint32_t time)
{
	/* Destroy this callback */
	wl_callback_destroy(cb);

	/* Request another frame */
	struct client_state *state = data;
	cb = wl_surface_frame(state->wl_surface);
	wl_callback_add_listener(cb, &wl_surface_frame_listener, state);

	/* Update scroll amount at 24 pixels per second */
	if (state->last_frame != 0) {
		int elapsed = time - state->last_frame;
		state->offset += elapsed / 1000.0 * 24;
	}

	/* Submit a frame for this event */
	struct wl_buffer *buffer = draw_frame(state);
	wl_surface_attach(state->wl_surface, buffer, 0, 0);
	wl_surface_damage_buffer(state->wl_surface, 0, 0, INT32_MAX, INT32_MAX);
	wl_surface_commit(state->wl_surface);

	state->last_frame = time;
}

static const struct wl_callback_listener wl_surface_frame_listener = {
	.done = wl_surface_frame_done,
};


struct wl_surface *cursor_surface;
struct wl_cursor_image *cursor_image;

static void
wl_pointer_enter(void *data, struct wl_pointer *wl_pointer,
               uint32_t serial, struct wl_surface *surface,
               wl_fixed_t surface_x, wl_fixed_t surface_y)
{
       struct client_state *client_state = data;
       client_state->pointer_event.event_mask |= POINTER_EVENT_ENTER;
       client_state->pointer_event.serial = serial;
       client_state->pointer_event.surface_x = surface_x,
               client_state->pointer_event.surface_y = surface_y;
               

	// Set our pointer               
    wl_pointer_set_cursor(wl_pointer, serial, cursor_surface,
        cursor_image->hotspot_x, cursor_image->hotspot_y);
}

static void
wl_pointer_leave(void *data, struct wl_pointer *wl_pointer,
               uint32_t serial, struct wl_surface *surface)
{
       struct client_state *client_state = data;
       client_state->pointer_event.serial = serial;
       client_state->pointer_event.event_mask |= POINTER_EVENT_LEAVE;
}


enum xdg_toplevel_resize_edge
component_edge(const int width, const int height,
	       const int pointer_x,
	       const int pointer_y,
	       const int margin)
{
	const bool top = pointer_y < margin;
	const bool bottom = pointer_y > (height - margin);
	const bool left = pointer_x < margin;
	const bool right = pointer_x > (width - margin);

	if (top)
		if (left)
			return XDG_TOPLEVEL_RESIZE_EDGE_TOP_LEFT;
		else if (right)
			return XDG_TOPLEVEL_RESIZE_EDGE_TOP_RIGHT;
		else
			return XDG_TOPLEVEL_RESIZE_EDGE_TOP;
	else if (bottom)
		if (left)
			return XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_LEFT;
		else if (right)
			return XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_RIGHT;
		else
			return XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM;
	else if (left)
		return XDG_TOPLEVEL_RESIZE_EDGE_LEFT;
	else if (right)
		return XDG_TOPLEVEL_RESIZE_EDGE_RIGHT;
	else
		return XDG_TOPLEVEL_RESIZE_EDGE_NONE;
}

void
set_cursor(struct client_state *client_state, struct wl_pointer *wl_pointer)
{
	struct libdecor_plugin_cairo *plugin_cairo = seat->plugin_cairo;
	struct libdecor_frame_cairo *frame_cairo =
			wl_surface_get_user_data(seat->pointer_focus);
	struct wl_cursor *wl_cursor = NULL;
	enum libdecor_resize_edge edge = LIBDECOR_RESIZE_EDGE_NONE;
	struct wl_cursor_image *image;
	struct wl_buffer *buffer;

	if (!frame_cairo || !frame_cairo->active)
		return;

	switch (frame_cairo->active->type) {
	case NONE:
		wl_cursor = NULL;
		break;
	case SHADOW:
		edge = component_edge(frame_cairo->active, seat->pointer_x,
				      seat->pointer_y, SHADOW_MARGIN);
		break;
	case TITLE:
	case BUTTON_MIN:
	case BUTTON_MAX:
	case BUTTON_CLOSE:
		wl_cursor = plugin_cairo->cursor_left_ptr;
		break;
	}

	if (edge != LIBDECOR_RESIZE_EDGE_NONE && resizable(frame_cairo))
		wl_cursor = plugin_cairo->cursors[edge-1];

	if (wl_cursor == NULL)
		return;

	image = wl_cursor->images[0];
	buffer = wl_cursor_image_get_buffer(image);
	wl_pointer_set_cursor(wl_pointer, seat->serial,
			      seat->cursor_surface,
			      image->hotspot_x,
			      image->hotspot_y);
	wl_surface_attach(seat->cursor_surface, buffer, 0, 0);
	wl_surface_damage(seat->cursor_surface, 0, 0,
			  image->width, image->height);
	wl_surface_commit(seat->cursor_surface);
}


static void
wl_pointer_motion(void *data, struct wl_pointer *wl_pointer, uint32_t time,
               wl_fixed_t surface_x, wl_fixed_t surface_y)
{
       struct client_state *client_state = data;
       client_state->pointer_event.event_mask |= POINTER_EVENT_MOTION;
       client_state->pointer_event.time = time;
       client_state->pointer_event.surface_x = surface_x,
               client_state->pointer_event.surface_y = surface_y;
}

static void
wl_pointer_button(void *data, struct wl_pointer *wl_pointer, uint32_t serial,
               uint32_t time, uint32_t button, uint32_t state)
{
       struct client_state *client_state = data;
       client_state->pointer_event.event_mask |= POINTER_EVENT_BUTTON;
       client_state->pointer_event.time = time;
       client_state->pointer_event.serial = serial;
       client_state->pointer_event.button = button,
               client_state->pointer_event.state = state;
               
      if (button == BTN_LEFT) {
	      if (state == WL_POINTER_BUTTON_STATE_PRESSED) {
	      	enum xdg_toplevel_resize_edge edge = component_edge(client_state->width, client_state->height, client_state->pointer_x, client_state->pointer_y, 15);
			  	if (edge != XDG_TOPLEVEL_RESIZE_EDGE_NONE) {
					xdg_toplevel_resize(
						client_state->xdg_toplevel,
						client_state->wl_seat,
						serial,
						edge);
				}

	      }
      }

}

static void
wl_pointer_axis(void *data, struct wl_pointer *wl_pointer, uint32_t time,
               uint32_t axis, wl_fixed_t value)
{
       struct client_state *client_state = data;
       client_state->pointer_event.event_mask |= POINTER_EVENT_AXIS;
       client_state->pointer_event.time = time;
       client_state->pointer_event.axes[axis].valid = true;
       client_state->pointer_event.axes[axis].value = value;
}

static void
wl_pointer_axis_source(void *data, struct wl_pointer *wl_pointer,
               uint32_t axis_source)
{
       struct client_state *client_state = data;
       client_state->pointer_event.event_mask |= POINTER_EVENT_AXIS_SOURCE;
       client_state->pointer_event.axis_source = axis_source;
}

static void
wl_pointer_axis_stop(void *data, struct wl_pointer *wl_pointer,
               uint32_t time, uint32_t axis)
{
       struct client_state *client_state = data;
       client_state->pointer_event.time = time;
       client_state->pointer_event.event_mask |= POINTER_EVENT_AXIS_STOP;
       client_state->pointer_event.axes[axis].valid = true;
}

static void
wl_pointer_axis_discrete(void *data, struct wl_pointer *wl_pointer,
               uint32_t axis, int32_t discrete)
{
       struct client_state *client_state = data;
       client_state->pointer_event.event_mask |= POINTER_EVENT_AXIS_DISCRETE;
       client_state->pointer_event.axes[axis].valid = true;
       client_state->pointer_event.axes[axis].discrete = discrete;
}

static void
wl_pointer_frame(void *data, struct wl_pointer *wl_pointer)
{
       struct client_state *client_state = data;
       struct pointer_event *event = &client_state->pointer_event;
       fprintf(stderr, "pointer frame @ %d: ", event->time);

       if (event->event_mask & POINTER_EVENT_ENTER) {
               fprintf(stderr, "entered %f, %f ",
                               wl_fixed_to_double(event->surface_x),
                               wl_fixed_to_double(event->surface_y));
       }

       if (event->event_mask & POINTER_EVENT_LEAVE) {
               fprintf(stderr, "leave");
       }

       if (event->event_mask & POINTER_EVENT_MOTION) {
               fprintf(stderr, "motion %f, %f ",
                               wl_fixed_to_double(event->surface_x),
                               wl_fixed_to_double(event->surface_y));
			client_state->pointer_x = wl_fixed_to_int(event->surface_x);
			client_state->pointer_y = wl_fixed_to_int(event->surface_y);

       }

       if (event->event_mask & POINTER_EVENT_BUTTON) {
               char *state = event->state == WL_POINTER_BUTTON_STATE_RELEASED ?
                       "released" : "pressed";
               fprintf(stderr, "button %d %s ", event->button, state);
       }

       uint32_t axis_events = POINTER_EVENT_AXIS
               | POINTER_EVENT_AXIS_SOURCE
               | POINTER_EVENT_AXIS_STOP
               | POINTER_EVENT_AXIS_DISCRETE;
       char *axis_name[2] = {
               [WL_POINTER_AXIS_VERTICAL_SCROLL] = "vertical",
               [WL_POINTER_AXIS_HORIZONTAL_SCROLL] = "horizontal",
       };
       char *axis_source[4] = {
               [WL_POINTER_AXIS_SOURCE_WHEEL] = "wheel",
               [WL_POINTER_AXIS_SOURCE_FINGER] = "finger",
               [WL_POINTER_AXIS_SOURCE_CONTINUOUS] = "continuous",
               [WL_POINTER_AXIS_SOURCE_WHEEL_TILT] = "wheel tilt",
       };
       if (event->event_mask & axis_events) {
               for (size_t i = 0; i < 2; ++i) {
                       if (!event->axes[i].valid) {
                               continue;
                       }
                       fprintf(stderr, "%s axis ", axis_name[i]);
                       if (event->event_mask & POINTER_EVENT_AXIS) {
                               fprintf(stderr, "value %f ", wl_fixed_to_double(
                                                       event->axes[i].value));
                       }
                       if (event->event_mask & POINTER_EVENT_AXIS_DISCRETE) {
                               fprintf(stderr, "discrete %d ",
                                               event->axes[i].discrete);
                       }
                       if (event->event_mask & POINTER_EVENT_AXIS_SOURCE) {
                               fprintf(stderr, "via %s ",
                                               axis_source[event->axis_source]);
                       }
                       if (event->event_mask & POINTER_EVENT_AXIS_STOP) {
                               fprintf(stderr, "(stopped) ");
                       }
               }
       }

       fprintf(stderr, "\n");
       memset(event, 0, sizeof(*event));
}

static const struct wl_pointer_listener wl_pointer_listener = {
       .enter = wl_pointer_enter,
       .leave = wl_pointer_leave,
       .motion = wl_pointer_motion,
       .button = wl_pointer_button,
       .axis = wl_pointer_axis,
       .frame = wl_pointer_frame,
       .axis_source = wl_pointer_axis_source,
       .axis_stop = wl_pointer_axis_stop,
       .axis_discrete = wl_pointer_axis_discrete,
};

static void
wl_keyboard_keymap(void *data, struct wl_keyboard *wl_keyboard,
               uint32_t format, int32_t fd, uint32_t size)
{
       struct client_state *client_state = data;
       assert(format == WL_KEYBOARD_KEYMAP_FORMAT_XKB_V1);

       char *map_shm = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
       assert(map_shm != MAP_FAILED);

       struct xkb_keymap *xkb_keymap = xkb_keymap_new_from_string(
                       client_state->xkb_context, map_shm,
                       XKB_KEYMAP_FORMAT_TEXT_V1, XKB_KEYMAP_COMPILE_NO_FLAGS);
       munmap(map_shm, size);
       close(fd);

       struct xkb_state *xkb_state = xkb_state_new(xkb_keymap);
       xkb_keymap_unref(client_state->xkb_keymap);
       xkb_state_unref(client_state->xkb_state);
       client_state->xkb_keymap = xkb_keymap;
       client_state->xkb_state = xkb_state;
}

static void
wl_keyboard_enter(void *data, struct wl_keyboard *wl_keyboard,
               uint32_t serial, struct wl_surface *surface,
               struct wl_array *keys)
{
       struct client_state *client_state = data;
       fprintf(stderr, "keyboard enter; keys pressed are:\n");
       uint32_t *key;
       wl_array_for_each(key, keys) {
               char buf[128];
               xkb_keysym_t sym = xkb_state_key_get_one_sym(
                               client_state->xkb_state, *key + 8);
               xkb_keysym_get_name(sym, buf, sizeof(buf));
               fprintf(stderr, "sym: %-12s (%d), ", buf, sym);
               xkb_state_key_get_utf8(client_state->xkb_state,
                               *key + 8, buf, sizeof(buf));
               fprintf(stderr, "utf8: '%s'\n", buf);
       }
}

static void
wl_keyboard_leave(void *data, struct wl_keyboard *wl_keyboard,
               uint32_t serial, struct wl_surface *surface)
{
       fprintf(stderr, "keyboard leave\n");
}

static void
wl_keyboard_modifiers(void *data, struct wl_keyboard *wl_keyboard,
               uint32_t serial, uint32_t mods_depressed,
               uint32_t mods_latched, uint32_t mods_locked,
               uint32_t group)
{
       struct client_state *client_state = data;
       xkb_state_update_mask(client_state->xkb_state,
               mods_depressed, mods_latched, mods_locked, 0, 0, group);
}

static void
wl_keyboard_repeat_info(void *data, struct wl_keyboard *wl_keyboard,
               int32_t rate, int32_t delay)
{
       /* Left as an exercise for the reader */
}

static void
wl_keyboard_key(void *data, struct wl_keyboard *wl_keyboard,
               uint32_t serial, uint32_t time, uint32_t key, uint32_t state)
{
       struct client_state *client_state = data;
       char buf[128];
       uint32_t keycode = key + 8;
       xkb_keysym_t sym = xkb_state_key_get_one_sym(
                       client_state->xkb_state, keycode);
       xkb_keysym_get_name(sym, buf, sizeof(buf));
       const char *action =
               state == WL_KEYBOARD_KEY_STATE_PRESSED ? "press" : "release";
       fprintf(stderr, "key %s: sym: %-12s (%d), ", action, buf, sym);
       xkb_state_key_get_utf8(client_state->xkb_state, keycode,
                       buf, sizeof(buf));
       fprintf(stderr, "utf8: '%s'\n", buf);
}

static const struct wl_keyboard_listener wl_keyboard_listener = {
       .keymap = wl_keyboard_keymap,
       .enter = wl_keyboard_enter,
       .leave = wl_keyboard_leave,
       .key = wl_keyboard_key,
       .modifiers = wl_keyboard_modifiers,
       .repeat_info = wl_keyboard_repeat_info,
};

static void
wl_seat_capabilities(void *data, struct wl_seat *wl_seat, uint32_t capabilities)
{
       struct client_state *state = data;

       bool have_pointer = capabilities & WL_SEAT_CAPABILITY_POINTER;

       if (have_pointer && state->wl_pointer == NULL) {
               state->wl_pointer = wl_seat_get_pointer(state->wl_seat);
               wl_pointer_add_listener(state->wl_pointer,
                               &wl_pointer_listener, state);
       } else if (!have_pointer && state->wl_pointer != NULL) {
               wl_pointer_release(state->wl_pointer);
               state->wl_pointer = NULL;
       }

       bool have_keyboard = capabilities & WL_SEAT_CAPABILITY_KEYBOARD;

       if (have_keyboard && state->wl_keyboard == NULL) {
               state->wl_keyboard = wl_seat_get_keyboard(state->wl_seat);
               wl_keyboard_add_listener(state->wl_keyboard,
                               &wl_keyboard_listener, state);
       } else if (!have_keyboard && state->wl_keyboard != NULL) {
               wl_keyboard_release(state->wl_keyboard);
               state->wl_keyboard = NULL;
       }
}

static void
wl_seat_name(void *data, struct wl_seat *wl_seat, const char *name)
{
       fprintf(stderr, "seat name: %s\n", name);
}

static const struct wl_seat_listener wl_seat_listener = {
       .capabilities = wl_seat_capabilities,
       .name = wl_seat_name,
};

static void
registry_global(void *data, struct wl_registry *wl_registry,
        uint32_t name, const char *interface, uint32_t version)
{
    struct client_state *state = data;
    if (strcmp(interface, wl_shm_interface.name) == 0) {
        state->wl_shm = wl_registry_bind(
                wl_registry, name, &wl_shm_interface, 1);
    } else if (strcmp(interface, wl_compositor_interface.name) == 0) {
        state->wl_compositor = wl_registry_bind(
                wl_registry, name, &wl_compositor_interface, 4);
    } else if (strcmp(interface, xdg_wm_base_interface.name) == 0) {
        state->xdg_wm_base = wl_registry_bind(
                wl_registry, name, &xdg_wm_base_interface, 1);
        xdg_wm_base_add_listener(state->xdg_wm_base,
                &xdg_wm_base_listener, state);
   	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
           state->wl_seat = wl_registry_bind(
                           wl_registry, name, &wl_seat_interface, 5);
           wl_seat_add_listener(state->wl_seat,
                           &wl_seat_listener, state);
    }
}

static void
registry_global_remove(void *data,
        struct wl_registry *wl_registry, uint32_t name)
{
    /* This space deliberately left blank */
}

static const struct wl_registry_listener wl_registry_listener = {
    .global = registry_global,
    .global_remove = registry_global_remove,
};

int
main(int argc, char *argv[])
{
    struct client_state state = { 0 };
	state.width = 640;
	state.height = 480;
    state.wl_display = wl_display_connect(NULL);
    state.wl_registry = wl_display_get_registry(state.wl_display);
    state.xkb_context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
    wl_registry_add_listener(state.wl_registry, &wl_registry_listener, &state);
    wl_display_roundtrip(state.wl_display);

	struct wl_cursor_theme *cursor_theme =
		wl_cursor_theme_load(NULL, 24, state.wl_shm);
	struct wl_cursor *cursor =
		wl_cursor_theme_get_cursor(cursor_theme, "left_ptr");
	cursor_image = cursor->images[0];
	struct wl_buffer *cursor_buffer =
		wl_cursor_image_get_buffer(cursor_image);

	cursor_surface = wl_compositor_create_surface(state.wl_compositor);
	wl_surface_attach(cursor_surface, cursor_buffer, 0, 0);
	wl_surface_commit(cursor_surface);


    state.wl_surface = wl_compositor_create_surface(state.wl_compositor);

	//state.wl_region = wl_compositor_create_region(state.wl_compositor);
	//wl_region_add(state.wl_region, 0, 0, INT32_MAX, INT32_MAX);
	//wl_region_subtract(state.wl_region, 128,128,256,256);
    //wl_surface_set_opaque_region(state.wl_surface, state.wl_region);

    state.xdg_surface = xdg_wm_base_get_xdg_surface(
            state.xdg_wm_base, state.wl_surface);
    xdg_surface_add_listener(state.xdg_surface, &xdg_surface_listener, &state);
    state.xdg_toplevel = xdg_surface_get_toplevel(state.xdg_surface);
	xdg_toplevel_add_listener(state.xdg_toplevel,
			&xdg_toplevel_listener, &state);
    xdg_toplevel_set_title(state.xdg_toplevel, "Example client");
    wl_surface_commit(state.wl_surface);

	struct wl_callback *cb = wl_surface_frame(state.wl_surface);
	wl_callback_add_listener(cb, &wl_surface_frame_listener, &state);


    while (wl_display_dispatch(state.wl_display) && state.closed != true) {
        /* This space deliberately left blank */
    }

    return 0;
}