clients/simple-touch.c - weston - Git Browser for ODROID

 /*
  * Copyright © 2011 Benjamin Franzke
  * Copyright © 2011 Intel Corporation
  * Copyright © 2021 Collabora, Ltd.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
  * to deal in the Software without restriction, including without limitation
  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  * and/or sell copies of the Software, and to permit persons to whom the
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice (including the next
  * paragraph) shall be included in all copies or substantial portions of the
  * Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */

 #include "config.h"

 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdbool.h>
 #include <assert.h>
 #include <unistd.h>
 #include <errno.h>
 #include <sys/mman.h>

 #include <wayland-client.h>
 #include "shared/helpers.h"
 #include "shared/xalloc.h"
 #include "shared/os-compatibility.h"

 #include "xdg-shell-client-protocol.h"

 struct seat {
 	struct touch *touch;
 	struct wl_seat *seat;
 	struct wl_touch *wl_touch;
 };

 struct buffer {
 	struct wl_buffer *buffer;
 	void *data;
 };

 struct touch {
 	struct wl_display *display;
 	struct wl_registry *registry;
 	struct wl_compositor *compositor;
 	struct xdg_wm_base *wm_base;
 	struct wl_shm *shm;
 	struct wl_surface *surface;
 	struct xdg_surface *xdg_surface;
 	struct xdg_toplevel *xdg_toplevel;
 	struct buffer *buffer;
 	int width, height;
 	bool running;
 	bool wait_for_configure;
 	bool has_argb;
 };

 static struct buffer *
 create_shm_buffer(struct touch *touch)
 {
 	struct wl_shm_pool *pool;
 	int fd, size, stride;
 	void *data;
 	struct buffer *buffer = NULL;

 	buffer = zalloc(sizeof(*buffer));
 	if (!buffer)
 		return NULL;

 	stride = touch->width * 4;
 	size = stride * touch->height;

 	fd = os_create_anonymous_file(size);
 	if (fd < 0) {
 		fprintf(stderr, "creating a buffer file for %d B failed: %s\n",
 			size, strerror(errno));
 		exit(1);
 	}

 	data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
 	if (data == MAP_FAILED) {
 		fprintf(stderr, "mmap failed: %s\n", strerror(errno));
 		close(fd);
 		return NULL;
 	}

 	pool = wl_shm_create_pool(touch->shm, fd, size);
 	buffer->buffer =
 		wl_shm_pool_create_buffer(pool, 0,
 					  touch->width, touch->height, stride,
 					  WL_SHM_FORMAT_ARGB8888);

 	wl_shm_pool_destroy(pool);

 	buffer->data = data;
 	close(fd);

 	return buffer;
 }

 static void
 initial_redraw(void *data)
 {
 	struct touch *touch = data;
 	struct buffer *buffer = NULL;

 	buffer = create_shm_buffer(touch);
 	assert(buffer);

 	touch->buffer = buffer;

 	/* paint the "work-area" */
 	memset(buffer->data, 64, touch->width * touch->height * 4);

 	wl_surface_attach(touch->surface, buffer->buffer, 0, 0);
 	wl_surface_damage(touch->surface, 0, 0, touch->width, touch->height);
 	wl_surface_commit(touch->surface);
 }

 static void
 shm_format(void *data, struct wl_shm *wl_shm, uint32_t format)
 {
 	struct touch *touch = data;

 	if (format == WL_SHM_FORMAT_ARGB8888)
 		touch->has_argb = true;
 }

 struct wl_shm_listener shm_listener = {
 	shm_format
 };


 static void
 touch_paint(struct touch *touch, int32_t x, int32_t y, int32_t id)
 {
 	uint32_t *p, c;
 	static const uint32_t colors[] = {
 		0xffff0000,
 		0xffffff00,
 		0xff0000ff,
 		0xffff00ff,
 		0xff00ff00,
 		0xff00ffff,
 	};

 	if (id < (int32_t) ARRAY_LENGTH(colors))
 		c = colors[id];
 	else
 		c = 0xffffffff;

 	if (x < 2 || x >= touch->width - 2 ||
 	    y < 2 || y >= touch->height - 2)
 		return;

 	p = ((uint32_t *) touch->buffer->data) + (x - 2) + (y - 2) * touch->width;
 	p[2] = c;
 	p += touch->width;
 	p[1] = c;
 	p[2] = c;
 	p[3] = c;
 	p += touch->width;
 	p[0] = c;
 	p[1] = c;
 	p[2] = c;
 	p[3] = c;
 	p[4] = c;
 	p += touch->width;
 	p[1] = c;
 	p[2] = c;
 	p[3] = c;
 	p += touch->width;
 	p[2] = c;

 	wl_surface_attach(touch->surface, touch->buffer->buffer, 0, 0);
 	wl_surface_damage(touch->surface, x - 2, y - 2, 5, 5);
 	/* todo: We could queue up more damage before committing, if there
 	 * are more input events to handle.
 	 */
 	wl_surface_commit(touch->surface);
 }

 static void
 touch_handle_down(void *data, struct wl_touch *wl_touch,
 		  uint32_t serial, uint32_t time, struct wl_surface *surface,
 		  int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 {
 	struct touch *touch = data;
 	float x = wl_fixed_to_double(x_w);
 	float y = wl_fixed_to_double(y_w);

 	touch_paint(touch, x, y, id);
 }

 static void
 touch_handle_up(void *data, struct wl_touch *wl_touch,
 		uint32_t serial, uint32_t time, int32_t id)
 {
 }

 static void
 touch_handle_motion(void *data, struct wl_touch *wl_touch,
 		    uint32_t time, int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
 {
 	struct touch *touch = data;
 	float x = wl_fixed_to_double(x_w);
 	float y = wl_fixed_to_double(y_w);

 	touch_paint(touch, x, y, id);
 }

 static void
 touch_handle_frame(void *data, struct wl_touch *wl_touch)
 {
 }

 static void
 touch_handle_cancel(void *data, struct wl_touch *wl_touch)
 {
 }

 static const struct wl_touch_listener touch_listener = {
 	touch_handle_down,
 	touch_handle_up,
 	touch_handle_motion,
 	touch_handle_frame,
 	touch_handle_cancel,
 };

 static void
 seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
 			 enum wl_seat_capability caps)
 {
 	struct seat *seat = data;
 	struct touch *touch = seat->touch;

 	if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !seat->wl_touch) {
 		seat->wl_touch = wl_seat_get_touch(wl_seat);
 		wl_touch_set_user_data(seat->wl_touch, touch);
 		wl_touch_add_listener(seat->wl_touch, &touch_listener, touch);
 	} else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && seat->wl_touch) {
 		wl_touch_destroy(seat->wl_touch);
 		seat->wl_touch = NULL;
 	}
 }

 static const struct wl_seat_listener seat_listener = {
 	seat_handle_capabilities,
 };

 static void
 add_seat(struct touch *touch, uint32_t name, uint32_t version)
 {
 	struct seat *seat;

 	seat = malloc(sizeof *seat);
 	assert(seat);

 	seat->touch = touch;
 	seat->wl_touch = NULL;
 	seat->seat = wl_registry_bind(touch->registry, name,
 				      &wl_seat_interface, 1);
 	wl_seat_add_listener(seat->seat, &seat_listener, seat);
 }

 static void
 handle_xdg_surface_configure(void *data, struct xdg_surface *surface,
 			     uint32_t serial)
 {
 	struct touch *touch = data;

 	xdg_surface_ack_configure(surface, serial);

 	if (touch->wait_for_configure) {
 		initial_redraw(touch);
 		touch->wait_for_configure = false;
 	}
 }

 static const struct xdg_surface_listener xdg_surface_listener = {
 	handle_xdg_surface_configure,
 };

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

 static const struct xdg_wm_base_listener wm_base_listener = {
 	xdg_wm_base_ping,
 };

 static void
 handle_global(void *data, struct wl_registry *registry,
 	      uint32_t name, const char *interface, uint32_t version)
 {
 	struct touch *touch = data;

 	if (strcmp(interface, "wl_compositor") == 0) {
 		touch->compositor =
 			wl_registry_bind(registry, name,
 					 &wl_compositor_interface, 1);
 	} else if (strcmp(interface, "xdg_wm_base") == 0) {
 		touch->wm_base =
 			wl_registry_bind(registry, name,
 					 &xdg_wm_base_interface, 1);
 		xdg_wm_base_add_listener(touch->wm_base,
 					 &wm_base_listener, touch);
 	} else if (strcmp(interface, "wl_shm") == 0) {
 		touch->shm = wl_registry_bind(registry, name,
 					      &wl_shm_interface, 1);
 		wl_shm_add_listener(touch->shm, &shm_listener, touch);
 	} else if (strcmp(interface, "wl_seat") == 0) {
 		add_seat(touch, name, version);
 	}
 }

 static void
 handle_global_remove(void *data, struct wl_registry *registry, uint32_t name)
 {
 }

 static const struct wl_registry_listener registry_listener = {
 	handle_global,
 	handle_global_remove
 };

 static void
 handle_toplevel_configure(void *data, struct xdg_toplevel *xdg_toplevel,
 			      int32_t width, int32_t height,
 			      struct wl_array *state)
 {
 }

 static void
 handle_toplevel_close(void *data, struct xdg_toplevel *xdg_toplevel)
 {
 	struct touch *touch = data;
 	touch->running = false;
 }

 static const struct xdg_toplevel_listener xdg_toplevel_listener = {
 	handle_toplevel_configure,
 	handle_toplevel_close,
 };

 static struct touch *
 touch_create(int width, int height)
 {
 	struct touch *touch;

 	touch = malloc(sizeof *touch);
 	if (touch == NULL) {
 		fprintf(stderr, "out of memory\n");
 		exit(1);
 	}
 	touch->display = wl_display_connect(NULL);
 	assert(touch->display);

 	touch->has_argb = false;
 	touch->registry = wl_display_get_registry(touch->display);
 	wl_registry_add_listener(touch->registry, &registry_listener, touch);
 	wl_display_dispatch(touch->display);
 	wl_display_roundtrip(touch->display);

 	if (!touch->has_argb) {
 		fprintf(stderr, "WL_SHM_FORMAT_ARGB32 not available\n");
 		exit(1);
 	}

 	if (!touch->wm_base) {
 		fprintf(stderr, "xdg-shell required!\n");
 		exit(1);
 	}

 	touch->width = width;
 	touch->height = height;
 	touch->surface = wl_compositor_create_surface(touch->compositor);

 	touch->xdg_surface =
 		xdg_wm_base_get_xdg_surface(touch->wm_base, touch->surface);
 	assert(touch->xdg_surface);

 	xdg_surface_add_listener(touch->xdg_surface, &xdg_surface_listener, touch);

 	touch->xdg_toplevel = xdg_surface_get_toplevel(touch->xdg_surface);
 	assert(touch->xdg_toplevel);
 	xdg_toplevel_add_listener(touch->xdg_toplevel,
 				  &xdg_toplevel_listener, touch);
 	xdg_toplevel_set_title(touch->xdg_toplevel, "simple-touch");
 	xdg_toplevel_set_app_id(touch->xdg_toplevel, "simple-touch");
 	touch->wait_for_configure = true;
 	wl_surface_commit(touch->surface);

 	touch->running = true;

 	return touch;
 }

 static void
 destroy_touch(struct touch *touch)
 {
 	if (touch->buffer->buffer)
 		wl_buffer_destroy(touch->buffer->buffer);

 	if (touch->xdg_toplevel)
 		xdg_toplevel_destroy(touch->xdg_toplevel);
 	if (touch->xdg_surface)
 		xdg_surface_destroy(touch->xdg_surface);
 	if (touch->wm_base)
 		xdg_wm_base_destroy(touch->wm_base);
 	if (touch->shm)
 		wl_shm_destroy(touch->shm);
 	if (touch->compositor)
 		wl_compositor_destroy(touch->compositor);


 	wl_surface_destroy(touch->surface);
 	free(touch->buffer);
 	free(touch);
 }

 int
 main(int argc, char **argv)
 {
 	struct touch *touch;
 	int ret = 0;

 	touch = touch_create(600, 500);

 	while (ret != -1 && touch->running)
 		ret = wl_display_dispatch(touch->display);

 	destroy_touch(touch);
 	return 0;
 }
	/*
	* Copyright © 2011 Benjamin Franzke
	* Copyright © 2011 Intel Corporation
	* Copyright © 2021 Collabora, Ltd.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
	* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
	* DEALINGS IN THE SOFTWARE.
	*/

	#include "config.h"

	#include <stdint.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <stdbool.h>
	#include <assert.h>
	#include <unistd.h>
	#include <errno.h>
	#include <sys/mman.h>

	#include <wayland-client.h>
	#include "shared/helpers.h"
	#include "shared/xalloc.h"
	#include "shared/os-compatibility.h"

	#include "xdg-shell-client-protocol.h"

	struct seat {
	struct touch *touch;
	struct wl_seat *seat;
	struct wl_touch *wl_touch;
	};

	struct buffer {
	struct wl_buffer *buffer;
	void *data;
	};

	struct touch {
	struct wl_display *display;
	struct wl_registry *registry;
	struct wl_compositor *compositor;
	struct xdg_wm_base *wm_base;
	struct wl_shm *shm;
	struct wl_surface *surface;
	struct xdg_surface *xdg_surface;
	struct xdg_toplevel *xdg_toplevel;
	struct buffer *buffer;
	int width, height;
	bool running;
	bool wait_for_configure;
	bool has_argb;
	};

	static struct buffer *
	create_shm_buffer(struct touch *touch)
	{
	struct wl_shm_pool *pool;
	int fd, size, stride;
	void *data;
	struct buffer *buffer = NULL;

	buffer = zalloc(sizeof(*buffer));
	if (!buffer)
	return NULL;

	stride = touch->width * 4;
	size = stride * touch->height;

	fd = os_create_anonymous_file(size);
	if (fd < 0) {
	fprintf(stderr, "creating a buffer file for %d B failed: %s\n",
	size, strerror(errno));
	exit(1);
	}

	data = mmap(NULL, size, PROT_READ \| PROT_WRITE, MAP_SHARED, fd, 0);
	if (data == MAP_FAILED) {
	fprintf(stderr, "mmap failed: %s\n", strerror(errno));
	close(fd);
	return NULL;
	}

	pool = wl_shm_create_pool(touch->shm, fd, size);
	buffer->buffer =
	wl_shm_pool_create_buffer(pool, 0,
	touch->width, touch->height, stride,
	WL_SHM_FORMAT_ARGB8888);

	wl_shm_pool_destroy(pool);

	buffer->data = data;
	close(fd);

	return buffer;
	}

	static void
	initial_redraw(void *data)
	{
	struct touch *touch = data;
	struct buffer *buffer = NULL;

	buffer = create_shm_buffer(touch);
	assert(buffer);

	touch->buffer = buffer;

	/* paint the "work-area" */
	memset(buffer->data, 64, touch->width * touch->height * 4);

	wl_surface_attach(touch->surface, buffer->buffer, 0, 0);
	wl_surface_damage(touch->surface, 0, 0, touch->width, touch->height);
	wl_surface_commit(touch->surface);
	}

	static void
	shm_format(void data, struct wl_shm wl_shm, uint32_t format)
	{
	struct touch *touch = data;

	if (format == WL_SHM_FORMAT_ARGB8888)
	touch->has_argb = true;
	}

	struct wl_shm_listener shm_listener = {
	shm_format
	};


	static void
	touch_paint(struct touch *touch, int32_t x, int32_t y, int32_t id)
	{
	uint32_t *p, c;
	static const uint32_t colors[] = {
	0xffff0000,
	0xffffff00,
	0xff0000ff,
	0xffff00ff,
	0xff00ff00,
	0xff00ffff,
	};

	if (id < (int32_t) ARRAY_LENGTH(colors))
	c = colors[id];
	else
	c = 0xffffffff;

	if (x < 2 \|\| x >= touch->width - 2 \|\|
	y < 2 \|\| y >= touch->height - 2)
	return;

	p = ((uint32_t ) touch->buffer->data) + (x - 2) + (y - 2) touch->width;
	p[2] = c;
	p += touch->width;
	p[1] = c;
	p[2] = c;
	p[3] = c;
	p += touch->width;
	p[0] = c;
	p[1] = c;
	p[2] = c;
	p[3] = c;
	p[4] = c;
	p += touch->width;
	p[1] = c;
	p[2] = c;
	p[3] = c;
	p += touch->width;
	p[2] = c;

	wl_surface_attach(touch->surface, touch->buffer->buffer, 0, 0);
	wl_surface_damage(touch->surface, x - 2, y - 2, 5, 5);
	/* todo: We could queue up more damage before committing, if there
	* are more input events to handle.
	*/
	wl_surface_commit(touch->surface);
	}

	static void
	touch_handle_down(void data, struct wl_touch wl_touch,
	uint32_t serial, uint32_t time, struct wl_surface *surface,
	int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
	{
	struct touch *touch = data;
	float x = wl_fixed_to_double(x_w);
	float y = wl_fixed_to_double(y_w);

	touch_paint(touch, x, y, id);
	}

	static void
	touch_handle_up(void data, struct wl_touch wl_touch,
	uint32_t serial, uint32_t time, int32_t id)
	{
	}

	static void
	touch_handle_motion(void data, struct wl_touch wl_touch,
	uint32_t time, int32_t id, wl_fixed_t x_w, wl_fixed_t y_w)
	{
	struct touch *touch = data;
	float x = wl_fixed_to_double(x_w);
	float y = wl_fixed_to_double(y_w);

	touch_paint(touch, x, y, id);
	}

	static void
	touch_handle_frame(void data, struct wl_touch wl_touch)
	{
	}

	static void
	touch_handle_cancel(void data, struct wl_touch wl_touch)
	{
	}

	static const struct wl_touch_listener touch_listener = {
	touch_handle_down,
	touch_handle_up,
	touch_handle_motion,
	touch_handle_frame,
	touch_handle_cancel,
	};

	static void
	seat_handle_capabilities(void data, struct wl_seat wl_seat,
	enum wl_seat_capability caps)
	{
	struct seat *seat = data;
	struct touch *touch = seat->touch;

	if ((caps & WL_SEAT_CAPABILITY_TOUCH) && !seat->wl_touch) {
	seat->wl_touch = wl_seat_get_touch(wl_seat);
	wl_touch_set_user_data(seat->wl_touch, touch);
	wl_touch_add_listener(seat->wl_touch, &touch_listener, touch);
	} else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && seat->wl_touch) {
	wl_touch_destroy(seat->wl_touch);
	seat->wl_touch = NULL;
	}
	}

	static const struct wl_seat_listener seat_listener = {
	seat_handle_capabilities,
	};

	static void
	add_seat(struct touch *touch, uint32_t name, uint32_t version)
	{
	struct seat *seat;

	seat = malloc(sizeof *seat);
	assert(seat);

	seat->touch = touch;
	seat->wl_touch = NULL;
	seat->seat = wl_registry_bind(touch->registry, name,
	&wl_seat_interface, 1);
	wl_seat_add_listener(seat->seat, &seat_listener, seat);
	}

	static void
	handle_xdg_surface_configure(void data, struct xdg_surface surface,
	uint32_t serial)
	{
	struct touch *touch = data;

	xdg_surface_ack_configure(surface, serial);

	if (touch->wait_for_configure) {
	initial_redraw(touch);
	touch->wait_for_configure = false;
	}
	}

	static const struct xdg_surface_listener xdg_surface_listener = {
	handle_xdg_surface_configure,
	};

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

	static const struct xdg_wm_base_listener wm_base_listener = {
	xdg_wm_base_ping,
	};

	static void
	handle_global(void data, struct wl_registry registry,
	uint32_t name, const char *interface, uint32_t version)
	{
	struct touch *touch = data;

	if (strcmp(interface, "wl_compositor") == 0) {
	touch->compositor =
	wl_registry_bind(registry, name,
	&wl_compositor_interface, 1);
	} else if (strcmp(interface, "xdg_wm_base") == 0) {
	touch->wm_base =
	wl_registry_bind(registry, name,
	&xdg_wm_base_interface, 1);
	xdg_wm_base_add_listener(touch->wm_base,
	&wm_base_listener, touch);
	} else if (strcmp(interface, "wl_shm") == 0) {
	touch->shm = wl_registry_bind(registry, name,
	&wl_shm_interface, 1);
	wl_shm_add_listener(touch->shm, &shm_listener, touch);
	} else if (strcmp(interface, "wl_seat") == 0) {
	add_seat(touch, name, version);
	}
	}

	static void
	handle_global_remove(void data, struct wl_registry registry, uint32_t name)
	{
	}

	static const struct wl_registry_listener registry_listener = {
	handle_global,
	handle_global_remove
	};

	static void
	handle_toplevel_configure(void data, struct xdg_toplevel xdg_toplevel,
	int32_t width, int32_t height,
	struct wl_array *state)
	{
	}

	static void
	handle_toplevel_close(void data, struct xdg_toplevel xdg_toplevel)
	{
	struct touch *touch = data;
	touch->running = false;
	}

	static const struct xdg_toplevel_listener xdg_toplevel_listener = {
	handle_toplevel_configure,
	handle_toplevel_close,
	};

	static struct touch *
	touch_create(int width, int height)
	{
	struct touch *touch;

	touch = malloc(sizeof *touch);
	if (touch == NULL) {
	fprintf(stderr, "out of memory\n");
	exit(1);
	}
	touch->display = wl_display_connect(NULL);
	assert(touch->display);

	touch->has_argb = false;
	touch->registry = wl_display_get_registry(touch->display);
	wl_registry_add_listener(touch->registry, &registry_listener, touch);
	wl_display_dispatch(touch->display);
	wl_display_roundtrip(touch->display);

	if (!touch->has_argb) {
	fprintf(stderr, "WL_SHM_FORMAT_ARGB32 not available\n");
	exit(1);
	}

	if (!touch->wm_base) {
	fprintf(stderr, "xdg-shell required!\n");
	exit(1);
	}

	touch->width = width;
	touch->height = height;
	touch->surface = wl_compositor_create_surface(touch->compositor);

	touch->xdg_surface =
	xdg_wm_base_get_xdg_surface(touch->wm_base, touch->surface);
	assert(touch->xdg_surface);

	xdg_surface_add_listener(touch->xdg_surface, &xdg_surface_listener, touch);

	touch->xdg_toplevel = xdg_surface_get_toplevel(touch->xdg_surface);
	assert(touch->xdg_toplevel);
	xdg_toplevel_add_listener(touch->xdg_toplevel,
	&xdg_toplevel_listener, touch);
	xdg_toplevel_set_title(touch->xdg_toplevel, "simple-touch");
	xdg_toplevel_set_app_id(touch->xdg_toplevel, "simple-touch");
	touch->wait_for_configure = true;
	wl_surface_commit(touch->surface);

	touch->running = true;

	return touch;
	}

	static void
	destroy_touch(struct touch *touch)
	{
	if (touch->buffer->buffer)
	wl_buffer_destroy(touch->buffer->buffer);

	if (touch->xdg_toplevel)
	xdg_toplevel_destroy(touch->xdg_toplevel);
	if (touch->xdg_surface)
	xdg_surface_destroy(touch->xdg_surface);
	if (touch->wm_base)
	xdg_wm_base_destroy(touch->wm_base);
	if (touch->shm)
	wl_shm_destroy(touch->shm);
	if (touch->compositor)
	wl_compositor_destroy(touch->compositor);


	wl_surface_destroy(touch->surface);
	free(touch->buffer);
	free(touch);
	}

	int
	main(int argc, char **argv)
	{
	struct touch *touch;
	int ret = 0;

	touch = touch_create(600, 500);

	while (ret != -1 && touch->running)
	ret = wl_display_dispatch(touch->display);

	destroy_touch(touch);
	return 0;
	}