weston/clients/presentation-shm.c

957 lines
22 KiB
C

/*
* Copyright © 2011 Benjamin Franzke
* Copyright © 2010 Intel Corporation
* Copyright © 2014 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 <sys/mman.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <wayland-client.h>
#include "shared/helpers.h"
#include <libweston/zalloc.h>
#include "shared/timespec-util.h"
#include "shared/os-compatibility.h"
#include "presentation-time-client-protocol.h"
#include "xdg-shell-client-protocol.h"
enum run_mode {
RUN_MODE_FEEDBACK,
RUN_MODE_FEEDBACK_IDLE,
RUN_MODE_PRESENT,
};
static const char * const run_mode_name[] = {
[RUN_MODE_FEEDBACK] = "feedback",
[RUN_MODE_FEEDBACK_IDLE] = "feedback-idle",
[RUN_MODE_PRESENT] = "low-lat present",
};
struct output {
struct wl_output *output;
uint32_t name;
struct wl_list link;
};
struct display {
struct wl_display *display;
struct wl_registry *registry;
struct wl_compositor *compositor;
struct xdg_wm_base *wm_base;
struct wl_shm *shm;
uint32_t formats;
struct wp_presentation *presentation;
clockid_t clk_id;
struct wl_list output_list; /* struct output::link */
};
struct feedback {
struct window *window;
unsigned frame_no;
struct wp_presentation_feedback *feedback;
struct timespec commit;
struct timespec target;
uint32_t frame_stamp;
struct wl_list link;
struct timespec present;
};
struct buffer {
struct wl_buffer *buffer;
void *shm_data;
int busy;
};
struct window {
struct display *display;
int width, height;
enum run_mode mode;
struct wl_surface *surface;
struct xdg_surface *xdg_surface;
struct xdg_toplevel *xdg_toplevel;
uint32_t configure_serial;
struct buffer *buffers;
int num_buffers;
int next;
int refresh_nsec;
int commit_delay_msecs;
struct wl_callback *callback;
struct wl_list feedback_list;
struct feedback *received_feedback;
};
#define NSEC_PER_SEC 1000000000
static void
buffer_release(void *data, struct wl_buffer *buffer)
{
struct buffer *mybuf = data;
mybuf->busy = 0;
}
static const struct wl_buffer_listener buffer_listener = {
buffer_release
};
static int
create_shm_buffers(struct display *display, struct buffer **buffers,
int num_buffers, int width, int height, uint32_t format)
{
struct buffer *bufs;
struct wl_shm_pool *pool;
int fd, size, stride, offset;
void *data;
int i;
stride = width * 4;
size = stride * height * num_buffers;
fd = os_create_anonymous_file(size);
if (fd < 0) {
fprintf(stderr, "creating a buffer file for %d B failed: %s\n",
size, strerror(errno));
return -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 -1;
}
pool = wl_shm_create_pool(display->shm, fd, size);
offset = 0;
bufs = calloc(num_buffers, sizeof(*bufs));
assert(bufs);
for (i = 0; i < num_buffers; i++) {
bufs[i].buffer = wl_shm_pool_create_buffer(pool, offset,
width, height,
stride, format);
assert(bufs[i].buffer);
wl_buffer_add_listener(bufs[i].buffer,
&buffer_listener, &bufs[i]);
bufs[i].shm_data = (char *)data + offset;
offset += stride * height;
}
wl_shm_pool_destroy(pool);
close(fd);
*buffers = bufs;
return 0;
}
static void
xdg_wm_base_handle_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_handle_ping,
};
static void
xdg_surface_handle_configure(void *data, struct xdg_surface *xdg_surface,
uint32_t serial)
{
struct window *window = data;
window->configure_serial = serial;
}
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 width, int32_t height,
struct wl_array *states)
{
/* noop */
}
static void
xdg_toplevel_handle_close(void *data, struct xdg_toplevel *xdg_toplevel)
{
fprintf(stderr, "presentation-shm exiting\n");
exit(0);
}
static const struct xdg_toplevel_listener xdg_toplevel_listener = {
.configure = xdg_toplevel_handle_configure,
.close = xdg_toplevel_handle_close,
};
static struct window *
create_window(struct display *display, int width, int height,
enum run_mode mode, int commit_delay_msecs)
{
struct window *window;
char title[128];
int ret;
snprintf(title, sizeof(title),
"presentation-shm: %s [Delay %i msecs]", run_mode_name[mode],
commit_delay_msecs);
window = zalloc(sizeof *window);
if (!window)
return NULL;
window->commit_delay_msecs = commit_delay_msecs;
window->mode = mode;
window->callback = NULL;
wl_list_init(&window->feedback_list);
window->display = display;
window->width = width;
window->height = height;
window->surface = wl_compositor_create_surface(display->compositor);
window->xdg_surface = xdg_wm_base_get_xdg_surface(display->wm_base,
window->surface);
if (!window->xdg_surface)
return NULL;
window->xdg_toplevel = xdg_surface_get_toplevel(window->xdg_surface);
if (!window->xdg_toplevel)
return NULL;
xdg_wm_base_add_listener(display->wm_base, &xdg_wm_base_listener,
NULL);
xdg_surface_add_listener(window->xdg_surface, &xdg_surface_listener,
window);
xdg_toplevel_add_listener(window->xdg_toplevel, &xdg_toplevel_listener,
window);
xdg_toplevel_set_title(window->xdg_toplevel, title);
xdg_toplevel_set_min_size(window->xdg_toplevel, width, height);
xdg_toplevel_set_max_size(window->xdg_toplevel, width, height);
wl_surface_commit(window->surface);
wl_display_roundtrip(window->display->display);
window->num_buffers = 60;
window->refresh_nsec = NSEC_PER_SEC / 60; /* 60 Hz guess */
window->next = 0;
ret = create_shm_buffers(window->display,
&window->buffers, window->num_buffers,
window->width, window->height,
WL_SHM_FORMAT_XRGB8888);
assert(ret == 0);
return window;
}
static void
destroy_feedback(struct feedback *feedback)
{
if (feedback->feedback)
wp_presentation_feedback_destroy(feedback->feedback);
wl_list_remove(&feedback->link);
free(feedback);
}
static void
destroy_window(struct window *window)
{
int i;
while (!wl_list_empty(&window->feedback_list)) {
struct feedback *f;
f = wl_container_of(window->feedback_list.next, f, link);
printf("clean up feedback %u\n", f->frame_no);
destroy_feedback(f);
}
if (window->callback)
wl_callback_destroy(window->callback);
xdg_surface_destroy(window->xdg_surface);
wl_surface_destroy(window->surface);
for (i = 0; i < window->num_buffers; i++)
wl_buffer_destroy(window->buffers[i].buffer);
/* munmap(window->buffers[0].shm_data, size); */
free(window->buffers);
free(window);
}
static struct buffer *
window_next_buffer(struct window *window)
{
struct buffer *buf = &window->buffers[window->next];
window->next = (window->next + 1) % window->num_buffers;
return buf;
}
static void
paint_pixels(void *image, int width, int height, uint32_t phase)
{
const int halfh = height / 2;
const int halfw = width / 2;
uint32_t *pixel = image;
int y, or;
double ang = M_PI * 2.0 / 1000000.0 * phase;
double s = sin(ang);
double c = cos(ang);
/* squared radii thresholds */
or = (halfw < halfh ? halfw : halfh) - 16;
or *= or;
for (y = 0; y < height; y++) {
int x;
int oy = y - halfh;
int y2 = oy * oy;
for (x = 0; x < width; x++) {
int ox = x - halfw;
uint32_t v = 0xff000000;
double rx, ry;
if (ox * ox + y2 > or) {
if (ox * oy > 0)
*pixel++ = 0xff000000;
else
*pixel++ = 0xffffffff;
continue;
}
rx = c * ox + s * oy;
ry = -s * ox + c * oy;
if (rx < 0.0)
v |= 0x00ff0000;
if (ry < 0.0)
v |= 0x0000ff00;
if ((rx < 0.0) == (ry < 0.0))
v |= 0x000000ff;
*pixel++ = v;
}
}
}
static void
feedback_sync_output(void *data,
struct wp_presentation_feedback *presentation_feedback,
struct wl_output *output)
{
/* not interested */
}
static char *
pflags_to_str(uint32_t flags, char *str, unsigned len)
{
static const struct {
uint32_t flag;
char sym;
} desc[] = {
{ WP_PRESENTATION_FEEDBACK_KIND_VSYNC, 's' },
{ WP_PRESENTATION_FEEDBACK_KIND_HW_CLOCK, 'c' },
{ WP_PRESENTATION_FEEDBACK_KIND_HW_COMPLETION, 'e' },
{ WP_PRESENTATION_FEEDBACK_KIND_ZERO_COPY, 'z' },
};
unsigned i;
*str = '\0';
if (len < ARRAY_LENGTH(desc) + 1)
return str;
for (i = 0; i < ARRAY_LENGTH(desc); i++)
str[i] = flags & desc[i].flag ? desc[i].sym : '_';
str[ARRAY_LENGTH(desc)] = '\0';
return str;
}
static uint32_t
timespec_to_ms(const struct timespec *ts)
{
return (uint32_t)ts->tv_sec * 1000 + ts->tv_nsec / 1000000;
}
static int
timespec_diff_to_usec(const struct timespec *a, const struct timespec *b)
{
time_t secs = a->tv_sec - b->tv_sec;
long nsec = a->tv_nsec - b->tv_nsec;
return secs * 1000000 + nsec / 1000;
}
static void
feedback_presented(void *data,
struct wp_presentation_feedback *presentation_feedback,
uint32_t tv_sec_hi,
uint32_t tv_sec_lo,
uint32_t tv_nsec,
uint32_t refresh_nsec,
uint32_t seq_hi,
uint32_t seq_lo,
uint32_t flags)
{
struct feedback *feedback = data;
struct window *window = feedback->window;
struct feedback *prev_feedback = window->received_feedback;
uint64_t seq = u64_from_u32s(seq_hi, seq_lo);
const struct timespec *prevpresent;
uint32_t commit, present;
uint32_t f2c, c2p, f2p;
int p2p, t2p;
char flagstr[10];
timespec_from_proto(&feedback->present, tv_sec_hi, tv_sec_lo, tv_nsec);
commit = timespec_to_ms(&feedback->commit);
present = timespec_to_ms(&feedback->present);
if (prev_feedback)
prevpresent = &prev_feedback->present;
else
prevpresent = &feedback->present;
f2c = commit - feedback->frame_stamp;
c2p = present - commit;
f2p = present - feedback->frame_stamp;
p2p = timespec_diff_to_usec(&feedback->present, prevpresent);
t2p = timespec_diff_to_usec(&feedback->present, &feedback->target);
switch (window->mode) {
case RUN_MODE_PRESENT:
printf("%6u: c2p %4u ms, p2p %5d us, t2p %6d us, [%s] "
"seq %" PRIu64 "\n", feedback->frame_no, c2p,
p2p, t2p,
pflags_to_str(flags, flagstr, sizeof(flagstr)), seq);
break;
case RUN_MODE_FEEDBACK:
case RUN_MODE_FEEDBACK_IDLE:
printf("%6u: f2c %2u ms, c2p %2u ms, f2p %2u ms, p2p %5d us, "
"t2p %6d, [%s], seq %" PRIu64 "\n", feedback->frame_no,
f2c, c2p, f2p, p2p, t2p,
pflags_to_str(flags, flagstr, sizeof(flagstr)), seq);
}
if (window->received_feedback)
destroy_feedback(window->received_feedback);
window->received_feedback = feedback;
}
static void
feedback_discarded(void *data,
struct wp_presentation_feedback *presentation_feedback)
{
struct feedback *feedback = data;
printf("discarded %u\n", feedback->frame_no);
destroy_feedback(feedback);
}
static const struct wp_presentation_feedback_listener feedback_listener = {
feedback_sync_output,
feedback_presented,
feedback_discarded
};
static void
window_emulate_rendering(struct window *window)
{
struct timespec delay;
int ret;
if (window->commit_delay_msecs <= 0)
return;
delay.tv_sec = window->commit_delay_msecs / 1000;
delay.tv_nsec = (window->commit_delay_msecs % 1000) * 1000000;
ret = nanosleep(&delay, NULL);
if (ret)
printf("nanosleep failed: %s\n", strerror(errno));
}
static void
window_create_feedback(struct window *window, uint32_t frame_stamp)
{
static unsigned seq;
struct wp_presentation *pres = window->display->presentation;
struct feedback *feedback;
seq++;
if (!pres)
return;
feedback = zalloc(sizeof *feedback);
if (!feedback)
return;
feedback->window = window;
feedback->feedback = wp_presentation_feedback(pres, window->surface);
wp_presentation_feedback_add_listener(feedback->feedback,
&feedback_listener, feedback);
feedback->frame_no = seq;
clock_gettime(window->display->clk_id, &feedback->commit);
feedback->frame_stamp = frame_stamp;
feedback->target = feedback->commit;
wl_list_insert(&window->feedback_list, &feedback->link);
}
static void
window_commit_next(struct window *window)
{
struct buffer *buffer;
buffer = window_next_buffer(window);
assert(buffer);
if (window->configure_serial) {
xdg_surface_ack_configure(window->xdg_surface,
window->configure_serial);
window->configure_serial = 0;
}
wl_surface_attach(window->surface, buffer->buffer, 0, 0);
wl_surface_damage(window->surface, 0, 0, window->width, window->height);
wl_surface_commit(window->surface);
buffer->busy = 1;
}
static const struct wl_callback_listener frame_listener_mode_feedback;
static void
redraw_mode_feedback(void *data, struct wl_callback *callback, uint32_t time)
{
struct window *window = data;
if (callback && window->mode == RUN_MODE_FEEDBACK_IDLE)
sleep(1);
if (callback)
wl_callback_destroy(callback);
window_emulate_rendering(window);
window->callback = wl_surface_frame(window->surface);
wl_callback_add_listener(window->callback,
&frame_listener_mode_feedback, window);
window_create_feedback(window, time);
window_commit_next(window);
}
static const struct wl_callback_listener frame_listener_mode_feedback = {
redraw_mode_feedback
};
static const struct wp_presentation_feedback_listener feedkick_listener;
static void
window_feedkick(struct window *window)
{
struct wp_presentation *pres = window->display->presentation;
struct wp_presentation_feedback *fback;
fback = wp_presentation_feedback(pres, window->surface);
wp_presentation_feedback_add_listener(fback, &feedkick_listener,
window);
}
static void
feedkick_presented(void *data,
struct wp_presentation_feedback *presentation_feedback,
uint32_t tv_sec_hi,
uint32_t tv_sec_lo,
uint32_t tv_nsec,
uint32_t refresh_nsec,
uint32_t seq_hi,
uint32_t seq_lo,
uint32_t flags)
{
struct window *window = data;
wp_presentation_feedback_destroy(presentation_feedback);
window->refresh_nsec = refresh_nsec;
switch (window->mode) {
case RUN_MODE_PRESENT:
window_emulate_rendering(window);
window_create_feedback(window, 0);
window_feedkick(window);
window_commit_next(window);
break;
case RUN_MODE_FEEDBACK:
case RUN_MODE_FEEDBACK_IDLE:
assert(0 && "bad mode");
}
}
static void
feedkick_discarded(void *data,
struct wp_presentation_feedback *presentation_feedback)
{
struct window *window = data;
wp_presentation_feedback_destroy(presentation_feedback);
switch (window->mode) {
case RUN_MODE_PRESENT:
window_emulate_rendering(window);
window_create_feedback(window, 0);
window_feedkick(window);
window_commit_next(window);
break;
case RUN_MODE_FEEDBACK:
case RUN_MODE_FEEDBACK_IDLE:
assert(0 && "bad mode");
}
}
static const struct wp_presentation_feedback_listener feedkick_listener = {
feedback_sync_output,
feedkick_presented,
feedkick_discarded
};
static void
firstdraw_mode_burst(struct window *window)
{
window_emulate_rendering(window);
switch (window->mode) {
case RUN_MODE_PRESENT:
window_create_feedback(window, 0);
break;
case RUN_MODE_FEEDBACK:
case RUN_MODE_FEEDBACK_IDLE:
assert(0 && "bad mode");
}
window_feedkick(window);
window_commit_next(window);
}
static void
window_prerender(struct window *window)
{
int i;
int timefactor = 1000000 / window->num_buffers;
for (i = 0; i < window->num_buffers; i++) {
struct buffer *buf = &window->buffers[i];
if (buf->busy)
fprintf(stderr, "wl_buffer id %u) busy\n",
wl_proxy_get_id(
(struct wl_proxy *)buf->buffer));
paint_pixels(buf->shm_data, window->width, window->height,
i * timefactor);
}
}
static void
output_destroy(struct output *o)
{
wl_output_destroy(o->output);
wl_list_remove(&o->link);
free(o);
}
static void
display_add_output(struct display *d, uint32_t name, uint32_t version)
{
struct output *o;
o = zalloc(sizeof(*o));
assert(o);
o->output = wl_registry_bind(d->registry, name,
&wl_output_interface, 1);
o->name = name;
wl_list_insert(&d->output_list, &o->link);
}
static void
presentation_clock_id(void *data, struct wp_presentation *presentation,
uint32_t clk_id)
{
struct display *d = data;
d->clk_id = clk_id;
}
static const struct wp_presentation_listener presentation_listener = {
presentation_clock_id
};
static void
shm_format(void *data, struct wl_shm *wl_shm, uint32_t format)
{
struct display *d = data;
d->formats |= (1 << format);
}
static const struct wl_shm_listener shm_listener = {
shm_format
};
static void
registry_handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version)
{
struct display *d = data;
if (strcmp(interface, "wl_compositor") == 0) {
d->compositor =
wl_registry_bind(registry,
name, &wl_compositor_interface, 1);
} else if (strcmp(interface, "xdg_wm_base") == 0) {
d->wm_base =
wl_registry_bind(registry, name,
&xdg_wm_base_interface, 1);
} else if (strcmp(interface, "wl_shm") == 0) {
d->shm = wl_registry_bind(registry,
name, &wl_shm_interface, 1);
wl_shm_add_listener(d->shm, &shm_listener, d);
} else if (strcmp(interface, "wl_output") == 0) {
display_add_output(d, name, version);
} else if (strcmp(interface, wp_presentation_interface.name) == 0) {
d->presentation =
wl_registry_bind(registry,
name, &wp_presentation_interface, 1);
wp_presentation_add_listener(d->presentation,
&presentation_listener, d);
}
}
static void
registry_handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name)
{
struct display *d = data;
struct output *output, *otmp;
wl_list_for_each_safe(output, otmp, &d->output_list, link) {
if (output->name != name)
continue;
output_destroy(output);
}
}
static const struct wl_registry_listener registry_listener = {
registry_handle_global,
registry_handle_global_remove
};
static struct display *
create_display(void)
{
struct display *display;
display = malloc(sizeof *display);
if (display == NULL) {
fprintf(stderr, "out of memory\n");
exit(1);
}
display->display = wl_display_connect(NULL);
assert(display->display);
display->formats = 0;
display->clk_id = -1;
wl_list_init(&display->output_list);
display->registry = wl_display_get_registry(display->display);
wl_registry_add_listener(display->registry,
&registry_listener, display);
wl_display_roundtrip(display->display);
if (display->shm == NULL) {
fprintf(stderr, "No wl_shm global\n");
exit(1);
}
wl_display_roundtrip(display->display);
if (!(display->formats & (1 << WL_SHM_FORMAT_XRGB8888))) {
fprintf(stderr, "WL_SHM_FORMAT_XRGB32 not available\n");
exit(1);
}
wl_display_get_fd(display->display);
return display;
}
static void
destroy_display(struct display *display)
{
while (!wl_list_empty(&display->output_list)) {
struct output *o;
o = wl_container_of(display->output_list.next, o, link);
output_destroy(o);
}
if (display->shm)
wl_shm_destroy(display->shm);
if (display->wm_base)
xdg_wm_base_destroy(display->wm_base);
if (display->compositor)
wl_compositor_destroy(display->compositor);
wl_registry_destroy(display->registry);
wl_display_flush(display->display);
wl_display_disconnect(display->display);
free(display);
}
static int running = 1;
static void
signal_int(int signum)
{
running = 0;
}
static void
usage(const char *prog, int exit_code)
{
fprintf(stderr, "Usage: %s [mode] [options]\n"
"where 'mode' is one of\n"
" -f\t\trun in feedback mode (default)\n"
" -i\t\trun in feedback-idle mode; sleep 1s between frames\n"
" -p\t\trun in low-latency presentation mode\n"
"and 'options' may include\n"
" -d msecs\temulate the time used for rendering by a delay \n"
"\t\tof the given milliseconds before commit\n\n",
prog);
fprintf(stderr, "Printed timing statistics, depending on mode:\n"
" commit sequence number\n"
" f2c: time from frame callback timestamp to commit\n"
" c2p: time from commit to presentation\n"
" f2p: time from frame callback timestamp to presentation\n"
" p2p: time from previous presentation to this one\n"
" t2p: time from target timestamp to presentation\n"
" seq: MSC\n");
exit(exit_code);
}
int
main(int argc, char **argv)
{
struct sigaction sigint;
struct display *display;
struct window *window;
int ret = 0;
enum run_mode mode = RUN_MODE_FEEDBACK;
int i;
int commit_delay_msecs = 0;
for (i = 1; i < argc; i++) {
if (strcmp("-f", argv[i]) == 0)
mode = RUN_MODE_FEEDBACK;
else if (strcmp("-i", argv[i]) == 0)
mode = RUN_MODE_FEEDBACK_IDLE;
else if (strcmp("-p", argv[i]) == 0)
mode = RUN_MODE_PRESENT;
else if ((strcmp("-d", argv[i]) == 0) && (i + 1 < argc)) {
i++;
commit_delay_msecs = atoi(argv[i]);
}
else
usage(argv[0], EXIT_FAILURE);
}
display = create_display();
window = create_window(display, 250, 250, mode, commit_delay_msecs);
if (!window)
return 1;
sigint.sa_handler = signal_int;
sigemptyset(&sigint.sa_mask);
sigint.sa_flags = SA_RESETHAND;
sigaction(SIGINT, &sigint, NULL);
window_prerender(window);
switch (mode) {
case RUN_MODE_FEEDBACK:
case RUN_MODE_FEEDBACK_IDLE:
redraw_mode_feedback(window, NULL, 0);
break;
case RUN_MODE_PRESENT:
firstdraw_mode_burst(window);
break;
}
while (running && ret != -1)
ret = wl_display_dispatch(display->display);
fprintf(stderr, "presentation-shm exiting\n");
destroy_window(window);
destroy_display(display);
return 0;
}