wlroots-hyprland/backend/x11/output.c

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
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#include <drm_fourcc.h>
#include <xcb/dri3.h>
#include <xcb/present.h>
#include <xcb/render.h>
#include <xcb/shm.h>
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#include <xcb/xcb.h>
#include <xcb/xinput.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/interfaces/wlr_pointer.h>
#include <wlr/interfaces/wlr_touch.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_matrix.h>
#include <wlr/util/log.h>
#include "backend/x11.h"
#include "util/signal.h"
#include "util/time.h"
static const uint32_t SUPPORTED_OUTPUT_STATE =
WLR_OUTPUT_STATE_BACKEND_OPTIONAL |
WLR_OUTPUT_STATE_BUFFER |
WLR_OUTPUT_STATE_MODE;
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static void parse_xcb_setup(struct wlr_output *output,
xcb_connection_t *xcb) {
const xcb_setup_t *xcb_setup = xcb_get_setup(xcb);
snprintf(output->make, sizeof(output->make), "%.*s",
xcb_setup_vendor_length(xcb_setup),
xcb_setup_vendor(xcb_setup));
snprintf(output->model, sizeof(output->model), "%"PRIu16".%"PRIu16,
xcb_setup->protocol_major_version,
xcb_setup->protocol_minor_version);
}
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static struct wlr_x11_output *get_x11_output_from_output(
struct wlr_output *wlr_output) {
assert(wlr_output_is_x11(wlr_output));
return (struct wlr_x11_output *)wlr_output;
}
static bool output_set_custom_mode(struct wlr_output *wlr_output,
int32_t width, int32_t height, int32_t refresh) {
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struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
const uint32_t values[] = { width, height };
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xcb_void_cookie_t cookie = xcb_configure_window_checked(
x11->xcb, output->win,
XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT, values);
xcb_generic_error_t *error;
if ((error = xcb_request_check(x11->xcb, cookie))) {
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wlr_log(WLR_ERROR, "Could not set window size to %dx%d\n",
width, height);
free(error);
return false;
}
return true;
}
static void destroy_x11_buffer(struct wlr_x11_buffer *buffer);
static void output_destroy(struct wlr_output *wlr_output) {
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struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
pixman_region32_fini(&output->exposed);
wlr_pointer_destroy(&output->pointer);
wlr_touch_destroy(&output->touch);
struct wlr_x11_buffer *buffer, *buffer_tmp;
wl_list_for_each_safe(buffer, buffer_tmp, &output->buffers, link) {
destroy_x11_buffer(buffer);
}
wl_list_remove(&output->link);
if (output->cursor.pic != XCB_NONE) {
xcb_render_free_picture(x11->xcb, output->cursor.pic);
}
// A zero event mask deletes the event context
xcb_present_select_input(x11->xcb, output->present_event_id, output->win, 0);
xcb_destroy_window(x11->xcb, output->win);
xcb_flush(x11->xcb);
free(output);
}
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static bool output_test(struct wlr_output *wlr_output) {
uint32_t unsupported =
wlr_output->pending.committed & ~SUPPORTED_OUTPUT_STATE;
if (unsupported != 0) {
wlr_log(WLR_DEBUG, "Unsupported output state fields: 0x%"PRIx32,
unsupported);
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return false;
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_MODE) {
assert(wlr_output->pending.mode_type == WLR_OUTPUT_STATE_MODE_CUSTOM);
}
return true;
}
static void destroy_x11_buffer(struct wlr_x11_buffer *buffer) {
if (!buffer) {
return;
}
wl_list_remove(&buffer->buffer_destroy.link);
wl_list_remove(&buffer->link);
xcb_free_pixmap(buffer->x11->xcb, buffer->pixmap);
free(buffer);
}
static void buffer_handle_buffer_destroy(struct wl_listener *listener,
void *data) {
struct wlr_x11_buffer *buffer =
wl_container_of(listener, buffer, buffer_destroy);
destroy_x11_buffer(buffer);
}
static xcb_pixmap_t import_dmabuf(struct wlr_x11_output *output,
struct wlr_dmabuf_attributes *dmabuf) {
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struct wlr_x11_backend *x11 = output->x11;
if (dmabuf->format != x11->x11_format->drm) {
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// The pixmap's depth must match the window's depth, otherwise Present
// will throw a Match error
return XCB_PIXMAP_NONE;
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}
// xcb closes the FDs after sending them, so we need to dup them here
struct wlr_dmabuf_attributes dup_attrs = {0};
if (!wlr_dmabuf_attributes_copy(&dup_attrs, dmabuf)) {
return XCB_PIXMAP_NONE;
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}
const struct wlr_x11_format *x11_fmt = x11->x11_format;
xcb_pixmap_t pixmap = xcb_generate_id(x11->xcb);
if (x11->dri3_major_version > 1 || x11->dri3_minor_version >= 2) {
if (dmabuf->n_planes > 4) {
wlr_dmabuf_attributes_finish(&dup_attrs);
return XCB_PIXMAP_NONE;
}
xcb_dri3_pixmap_from_buffers(x11->xcb, pixmap, output->win,
dmabuf->n_planes, dmabuf->width, dmabuf->height, dmabuf->stride[0],
dmabuf->offset[0], dmabuf->stride[1], dmabuf->offset[1],
dmabuf->stride[2], dmabuf->offset[2], dmabuf->stride[3],
dmabuf->offset[3], x11_fmt->depth, x11_fmt->bpp, dmabuf->modifier,
dup_attrs.fd);
} else {
// PixmapFromBuffers requires DRI3 1.2
if (dmabuf->n_planes != 1
|| dmabuf->modifier != DRM_FORMAT_MOD_INVALID) {
wlr_dmabuf_attributes_finish(&dup_attrs);
return XCB_PIXMAP_NONE;
}
xcb_dri3_pixmap_from_buffer(x11->xcb, pixmap, output->win,
dmabuf->height * dmabuf->stride[0], dmabuf->width, dmabuf->height,
dmabuf->stride[0], x11_fmt->depth, x11_fmt->bpp, dup_attrs.fd[0]);
}
return pixmap;
}
static xcb_pixmap_t import_shm(struct wlr_x11_output *output,
struct wlr_shm_attributes *shm) {
struct wlr_x11_backend *x11 = output->x11;
if (shm->format != x11->x11_format->drm) {
// The pixmap's depth must match the window's depth, otherwise Present
// will throw a Match error
return XCB_PIXMAP_NONE;
}
// xcb closes the FD after sending it
int fd = fcntl(shm->fd, F_DUPFD_CLOEXEC, 0);
if (fd < 0) {
wlr_log_errno(WLR_ERROR, "fcntl(F_DUPFD_CLOEXEC) failed");
return XCB_PIXMAP_NONE;
}
xcb_shm_seg_t seg = xcb_generate_id(x11->xcb);
xcb_shm_attach_fd(x11->xcb, seg, fd, false);
xcb_pixmap_t pixmap = xcb_generate_id(x11->xcb);
xcb_shm_create_pixmap(x11->xcb, pixmap, output->win, shm->width,
shm->height, x11->x11_format->depth, seg, shm->offset);
xcb_shm_detach(x11->xcb, seg);
return pixmap;
}
static struct wlr_x11_buffer *create_x11_buffer(struct wlr_x11_output *output,
struct wlr_buffer *wlr_buffer) {
struct wlr_x11_backend *x11 = output->x11;
xcb_pixmap_t pixmap = XCB_PIXMAP_NONE;
struct wlr_dmabuf_attributes dmabuf_attrs;
struct wlr_shm_attributes shm_attrs;
if (wlr_buffer_get_dmabuf(wlr_buffer, &dmabuf_attrs)) {
pixmap = import_dmabuf(output, &dmabuf_attrs);
} else if (wlr_buffer_get_shm(wlr_buffer, &shm_attrs)) {
pixmap = import_shm(output, &shm_attrs);
}
if (pixmap == XCB_PIXMAP_NONE) {
return NULL;
}
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struct wlr_x11_buffer *buffer = calloc(1, sizeof(struct wlr_x11_buffer));
if (!buffer) {
xcb_free_pixmap(x11->xcb, pixmap);
return NULL;
}
buffer->buffer = wlr_buffer_lock(wlr_buffer);
buffer->pixmap = pixmap;
buffer->x11 = x11;
wl_list_insert(&output->buffers, &buffer->link);
buffer->buffer_destroy.notify = buffer_handle_buffer_destroy;
wl_signal_add(&wlr_buffer->events.destroy, &buffer->buffer_destroy);
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return buffer;
}
static struct wlr_x11_buffer *get_or_create_x11_buffer(
struct wlr_x11_output *output, struct wlr_buffer *wlr_buffer) {
struct wlr_x11_buffer *buffer;
wl_list_for_each(buffer, &output->buffers, link) {
if (buffer->buffer == wlr_buffer) {
wlr_buffer_lock(buffer->buffer);
return buffer;
}
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}
return create_x11_buffer(output, wlr_buffer);
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}
static bool output_commit_buffer(struct wlr_x11_output *output) {
struct wlr_x11_backend *x11 = output->x11;
struct wlr_buffer *buffer = output->wlr_output.pending.buffer;
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struct wlr_x11_buffer *x11_buffer =
get_or_create_x11_buffer(output, buffer);
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if (!x11_buffer) {
goto error;
}
xcb_xfixes_region_t region = XCB_NONE;
if (output->wlr_output.pending.committed & WLR_OUTPUT_STATE_DAMAGE) {
pixman_region32_union(&output->exposed, &output->exposed, &output->wlr_output.pending.damage);
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int rects_len = 0;
pixman_box32_t *rects = pixman_region32_rectangles(&output->exposed, &rects_len);
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xcb_rectangle_t *xcb_rects = calloc(rects_len, sizeof(xcb_rectangle_t));
if (!xcb_rects) {
goto error;
}
for (int i = 0; i < rects_len; i++) {
pixman_box32_t *box = &rects[i];
xcb_rects[i] = (struct xcb_rectangle_t){
.x = box->x1,
.y = box->y1,
.width = box->x2 - box->x1,
.height = box->y2 - box->y1,
};
}
region = xcb_generate_id(x11->xcb);
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xcb_xfixes_create_region(x11->xcb, region, rects_len, xcb_rects);
free(xcb_rects);
}
pixman_region32_clear(&output->exposed);
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uint32_t serial = output->wlr_output.commit_seq;
uint32_t options = 0;
uint64_t target_msc = output->last_msc ? output->last_msc + 1 : 0;
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xcb_present_pixmap(x11->xcb, output->win, x11_buffer->pixmap, serial,
0, region, 0, 0, XCB_NONE, XCB_NONE, XCB_NONE, options, target_msc,
0, 0, 0, NULL);
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if (region != XCB_NONE) {
xcb_xfixes_destroy_region(x11->xcb, region);
}
return true;
error:
destroy_x11_buffer(x11_buffer);
return false;
}
static bool output_commit(struct wlr_output *wlr_output) {
struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
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if (!output_test(wlr_output)) {
return false;
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_MODE) {
if (!output_set_custom_mode(wlr_output,
wlr_output->pending.custom_mode.width,
wlr_output->pending.custom_mode.height,
wlr_output->pending.custom_mode.refresh)) {
return false;
}
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED &&
x11->atoms.variable_refresh != XCB_ATOM_NONE) {
if (wlr_output->pending.adaptive_sync_enabled) {
uint32_t enabled = 1;
xcb_change_property(x11->xcb, XCB_PROP_MODE_REPLACE, output->win,
x11->atoms.variable_refresh, XCB_ATOM_CARDINAL, 32, 1,
&enabled);
wlr_output->adaptive_sync_status = WLR_OUTPUT_ADAPTIVE_SYNC_UNKNOWN;
} else {
xcb_delete_property(x11->xcb, output->win,
x11->atoms.variable_refresh);
wlr_output->adaptive_sync_status = WLR_OUTPUT_ADAPTIVE_SYNC_DISABLED;
}
}
if (wlr_output->pending.committed & WLR_OUTPUT_STATE_BUFFER) {
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if (!output_commit_buffer(output)) {
return false;
}
}
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xcb_flush(x11->xcb);
return true;
}
static void update_x11_output_cursor(struct wlr_x11_output *output,
int32_t hotspot_x, int32_t hotspot_y) {
struct wlr_x11_backend *x11 = output->x11;
xcb_cursor_t cursor = x11->transparent_cursor;
if (output->cursor.pic != XCB_NONE) {
cursor = xcb_generate_id(x11->xcb);
xcb_render_create_cursor(x11->xcb, cursor, output->cursor.pic,
hotspot_x, hotspot_y);
}
uint32_t values[] = {cursor};
xcb_change_window_attributes(x11->xcb, output->win,
XCB_CW_CURSOR, values);
xcb_flush(x11->xcb);
if (cursor != x11->transparent_cursor) {
xcb_free_cursor(x11->xcb, cursor);
}
}
static bool output_cursor_to_picture(struct wlr_x11_output *output,
struct wlr_buffer *buffer) {
struct wlr_x11_backend *x11 = output->x11;
struct wlr_renderer *renderer = output->wlr_output.renderer;
if (output->cursor.pic != XCB_NONE) {
xcb_render_free_picture(x11->xcb, output->cursor.pic);
}
output->cursor.pic = XCB_NONE;
if (buffer == NULL) {
return true;
}
int depth = 32;
int stride = buffer->width * 4;
uint8_t *data = malloc(buffer->height * stride);
if (data == NULL) {
return false;
}
if (!wlr_renderer_begin_with_buffer(renderer, buffer)) {
free(data);
return false;
}
bool result = wlr_renderer_read_pixels(
renderer, DRM_FORMAT_ARGB8888, NULL,
stride, buffer->width, buffer->height, 0, 0, 0, 0,
data);
wlr_renderer_end(renderer);
if (!result) {
free(data);
return false;
}
xcb_pixmap_t pix = xcb_generate_id(x11->xcb);
xcb_create_pixmap(x11->xcb, depth, pix, output->win,
buffer->width, buffer->height);
output->cursor.pic = xcb_generate_id(x11->xcb);
xcb_render_create_picture(x11->xcb, output->cursor.pic,
pix, x11->argb32, 0, 0);
xcb_gcontext_t gc = xcb_generate_id(x11->xcb);
xcb_create_gc(x11->xcb, gc, pix, 0, NULL);
xcb_put_image(x11->xcb, XCB_IMAGE_FORMAT_Z_PIXMAP,
pix, gc, buffer->width, buffer->height, 0, 0, 0, depth,
stride * buffer->height * sizeof(uint8_t), data);
free(data);
xcb_free_gc(x11->xcb, gc);
xcb_free_pixmap(x11->xcb, pix);
return true;
}
static bool output_set_cursor(struct wlr_output *wlr_output,
struct wlr_buffer *buffer, int32_t hotspot_x, int32_t hotspot_y) {
struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
if (x11->argb32 == XCB_NONE) {
return false;
}
if (buffer != NULL) {
if (hotspot_x < 0) {
hotspot_x = 0;
}
if (hotspot_x > buffer->width) {
hotspot_x = buffer->width;
}
if (hotspot_y < 0) {
hotspot_y = 0;
}
if (hotspot_y > buffer->height) {
hotspot_y = buffer->height;
}
}
bool success = output_cursor_to_picture(output, buffer);
update_x11_output_cursor(output, hotspot_x, hotspot_y);
return success;
}
static bool output_move_cursor(struct wlr_output *_output, int x, int y) {
// TODO: only return true if x == current x and y == current y
return true;
}
static const struct wlr_drm_format_set *output_get_primary_formats(
struct wlr_output *wlr_output, uint32_t buffer_caps) {
struct wlr_x11_output *output = get_x11_output_from_output(wlr_output);
struct wlr_x11_backend *x11 = output->x11;
if (x11->have_dri3 && (buffer_caps & WLR_BUFFER_CAP_DMABUF)) {
return &output->x11->primary_dri3_formats;
} else if (x11->have_shm && (buffer_caps & WLR_BUFFER_CAP_SHM)) {
return &output->x11->primary_shm_formats;
}
return NULL;
}
static const struct wlr_output_impl output_impl = {
.destroy = output_destroy,
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.test = output_test,
.commit = output_commit,
.set_cursor = output_set_cursor,
.move_cursor = output_move_cursor,
.get_primary_formats = output_get_primary_formats,
};
struct wlr_output *wlr_x11_output_create(struct wlr_backend *backend) {
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struct wlr_x11_backend *x11 = get_x11_backend_from_backend(backend);
if (!x11->started) {
++x11->requested_outputs;
return NULL;
}
struct wlr_x11_output *output = calloc(1, sizeof(struct wlr_x11_output));
if (output == NULL) {
return NULL;
}
output->x11 = x11;
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wl_list_init(&output->buffers);
pixman_region32_init(&output->exposed);
struct wlr_output *wlr_output = &output->wlr_output;
wlr_output_init(wlr_output, &x11->backend, &output_impl, x11->wl_display);
wlr_output_update_custom_mode(wlr_output, 1024, 768, 0);
char name[64];
snprintf(name, sizeof(name), "X11-%zu", ++x11->last_output_num);
wlr_output_set_name(wlr_output, name);
parse_xcb_setup(wlr_output, x11->xcb);
char description[128];
snprintf(description, sizeof(description),
"X11 output %zu", x11->last_output_num);
wlr_output_set_description(wlr_output, description);
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// The X11 protocol requires us to set a colormap and border pixel if the
// depth doesn't match the root window's
uint32_t mask = XCB_CW_BORDER_PIXEL | XCB_CW_EVENT_MASK |
XCB_CW_COLORMAP | XCB_CW_CURSOR;
uint32_t values[] = {
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0,
XCB_EVENT_MASK_EXPOSURE | XCB_EVENT_MASK_STRUCTURE_NOTIFY,
x11->colormap,
x11->transparent_cursor,
};
output->win = xcb_generate_id(x11->xcb);
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xcb_create_window(x11->xcb, x11->depth->depth, output->win,
x11->screen->root, 0, 0, wlr_output->width, wlr_output->height, 0,
XCB_WINDOW_CLASS_INPUT_OUTPUT, x11->visualid, mask, values);
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struct {
xcb_input_event_mask_t head;
xcb_input_xi_event_mask_t mask;
} xinput_mask = {
.head = { .deviceid = XCB_INPUT_DEVICE_ALL_MASTER, .mask_len = 1 },
.mask = XCB_INPUT_XI_EVENT_MASK_KEY_PRESS |
XCB_INPUT_XI_EVENT_MASK_KEY_RELEASE |
XCB_INPUT_XI_EVENT_MASK_BUTTON_PRESS |
XCB_INPUT_XI_EVENT_MASK_BUTTON_RELEASE |
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XCB_INPUT_XI_EVENT_MASK_MOTION |
XCB_INPUT_XI_EVENT_MASK_TOUCH_BEGIN |
XCB_INPUT_XI_EVENT_MASK_TOUCH_END |
XCB_INPUT_XI_EVENT_MASK_TOUCH_UPDATE,
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};
xcb_input_xi_select_events(x11->xcb, output->win, 1, &xinput_mask.head);
uint32_t present_mask = XCB_PRESENT_EVENT_MASK_IDLE_NOTIFY |
XCB_PRESENT_EVENT_MASK_COMPLETE_NOTIFY;
output->present_event_id = xcb_generate_id(x11->xcb);
xcb_present_select_input(x11->xcb, output->present_event_id, output->win,
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present_mask);
xcb_change_property(x11->xcb, XCB_PROP_MODE_REPLACE, output->win,
x11->atoms.wm_protocols, XCB_ATOM_ATOM, 32, 1,
&x11->atoms.wm_delete_window);
wlr_x11_output_set_title(wlr_output, NULL);
xcb_map_window(x11->xcb, output->win);
xcb_flush(x11->xcb);
wl_list_insert(&x11->outputs, &output->link);
wlr_output_update_enabled(wlr_output, true);
wlr_pointer_init(&output->pointer, &pointer_impl, "x11-pointer");
output->pointer.base.output_name = strdup(wlr_output->name);
wlr_touch_init(&output->touch, &touch_impl, "x11-touch");
output->touch.base.output_name = strdup(wlr_output->name);
wl_list_init(&output->touchpoints);
wlr_signal_emit_safe(&x11->backend.events.new_output, wlr_output);
wlr_signal_emit_safe(&x11->backend.events.new_input, &output->pointer.base);
wlr_signal_emit_safe(&x11->backend.events.new_input, &output->touch.base);
// Start the rendering loop by requesting the compositor to render a frame
wlr_output_schedule_frame(wlr_output);
return wlr_output;
}
void handle_x11_configure_notify(struct wlr_x11_output *output,
xcb_configure_notify_event_t *ev) {
// ignore events that set an invalid size:
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if (ev->width == 0 || ev->height == 0) {
wlr_log(WLR_DEBUG,
"Ignoring X11 configure event for height=%d, width=%d",
ev->width, ev->height);
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return;
}
wlr_output_update_custom_mode(&output->wlr_output, ev->width,
ev->height, 0);
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// Move the pointer to its new location
update_x11_pointer_position(output, output->x11->time);
}
bool wlr_output_is_x11(struct wlr_output *wlr_output) {
return wlr_output->impl == &output_impl;
}
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void wlr_x11_output_set_title(struct wlr_output *output, const char *title) {
struct wlr_x11_output *x11_output = get_x11_output_from_output(output);
char wl_title[32];
if (title == NULL) {
if (snprintf(wl_title, sizeof(wl_title), "wlroots - %s", output->name) <= 0) {
return;
}
title = wl_title;
}
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xcb_change_property(x11_output->x11->xcb, XCB_PROP_MODE_REPLACE, x11_output->win,
x11_output->x11->atoms.net_wm_name, x11_output->x11->atoms.utf8_string, 8,
strlen(title), title);
}
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static struct wlr_x11_buffer *get_x11_buffer(struct wlr_x11_output *output,
xcb_pixmap_t pixmap) {
struct wlr_x11_buffer *buffer;
wl_list_for_each(buffer, &output->buffers, link) {
if (buffer->pixmap == pixmap) {
return buffer;
}
}
return NULL;
}
void handle_x11_present_event(struct wlr_x11_backend *x11,
xcb_ge_generic_event_t *event) {
struct wlr_x11_output *output;
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switch (event->event_type) {
case XCB_PRESENT_EVENT_IDLE_NOTIFY:;
xcb_present_idle_notify_event_t *idle_notify =
(xcb_present_idle_notify_event_t *)event;
output = get_x11_output_from_window_id(x11, idle_notify->window);
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if (!output) {
wlr_log(WLR_DEBUG, "Got PresentIdleNotify event for unknown window");
return;
}
struct wlr_x11_buffer *buffer =
get_x11_buffer(output, idle_notify->pixmap);
if (!buffer) {
wlr_log(WLR_DEBUG, "Got PresentIdleNotify event for unknown buffer");
return;
}
wlr_buffer_unlock(buffer->buffer); // may destroy buffer
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break;
case XCB_PRESENT_COMPLETE_NOTIFY:;
xcb_present_complete_notify_event_t *complete_notify =
(xcb_present_complete_notify_event_t *)event;
output = get_x11_output_from_window_id(x11, complete_notify->window);
if (!output) {
wlr_log(WLR_DEBUG, "Got PresentCompleteNotify event for unknown window");
return;
}
output->last_msc = complete_notify->msc;
struct timespec t;
timespec_from_nsec(&t, complete_notify->ust * 1000);
uint32_t flags = 0;
if (complete_notify->mode == XCB_PRESENT_COMPLETE_MODE_FLIP) {
flags |= WLR_OUTPUT_PRESENT_ZERO_COPY;
}
bool presented = complete_notify->mode != XCB_PRESENT_COMPLETE_MODE_SKIP;
struct wlr_output_event_present present_event = {
.output = &output->wlr_output,
.commit_seq = complete_notify->serial,
.presented = presented,
.when = &t,
.seq = complete_notify->msc,
.flags = flags,
};
wlr_output_send_present(&output->wlr_output, &present_event);
wlr_output_send_frame(&output->wlr_output);
break;
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default:
wlr_log(WLR_DEBUG, "Unhandled Present event %"PRIu16, event->event_type);
}
}