wlroots-hyprland/backend/x11/backend.c

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#define _POSIX_C_SOURCE 200809L
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#include <assert.h>
#include <fcntl.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
#include <xf86drm.h>
#include <wlr/config.h>
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#include <drm_fourcc.h>
#include <X11/Xlib-xcb.h>
#include <wayland-server-core.h>
#include <xcb/xcb.h>
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#include <xcb/dri3.h>
#include <xcb/present.h>
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#include <xcb/xfixes.h>
#include <xcb/xinput.h>
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#include <wlr/backend/interface.h>
#include <wlr/backend/x11.h>
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#include <wlr/interfaces/wlr_input_device.h>
#include <wlr/interfaces/wlr_keyboard.h>
#include <wlr/interfaces/wlr_pointer.h>
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#include <wlr/render/egl.h>
#include <wlr/render/wlr_renderer.h>
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#include <wlr/util/log.h>
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#include "backend/x11.h"
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#include "render/drm_format_set.h"
#include "render/gbm_allocator.h"
#include "render/wlr_renderer.h"
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#include "util/signal.h"
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// See dri2_format_for_depth in mesa
const struct wlr_x11_format formats[] = {
{ .drm = DRM_FORMAT_XRGB8888, .depth = 24, .bpp = 32 },
{ .drm = DRM_FORMAT_ARGB8888, .depth = 32, .bpp = 32 },
};
static const struct wlr_x11_format *x11_format_from_depth(uint8_t depth) {
for (size_t i = 0; i < sizeof(formats) / sizeof(formats[0]); i++) {
if (formats[i].depth == depth) {
return &formats[i];
}
}
return NULL;
}
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struct wlr_x11_output *get_x11_output_from_window_id(
struct wlr_x11_backend *x11, xcb_window_t window) {
struct wlr_x11_output *output;
wl_list_for_each(output, &x11->outputs, link) {
if (output->win == window) {
return output;
}
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}
return NULL;
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}
static void handle_x11_error(struct wlr_x11_backend *x11, xcb_value_error_t *ev);
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static void handle_x11_unknown_event(struct wlr_x11_backend *x11,
xcb_generic_event_t *ev);
static void handle_x11_event(struct wlr_x11_backend *x11,
xcb_generic_event_t *event) {
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switch (event->response_type & XCB_EVENT_RESPONSE_TYPE_MASK) {
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case XCB_EXPOSE: {
xcb_expose_event_t *ev = (xcb_expose_event_t *)event;
struct wlr_x11_output *output =
get_x11_output_from_window_id(x11, ev->window);
if (output != NULL) {
wlr_output_update_needs_frame(&output->wlr_output);
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}
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break;
}
case XCB_CONFIGURE_NOTIFY: {
xcb_configure_notify_event_t *ev =
(xcb_configure_notify_event_t *)event;
struct wlr_x11_output *output =
get_x11_output_from_window_id(x11, ev->window);
if (output != NULL) {
handle_x11_configure_notify(output, ev);
}
break;
}
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case XCB_CLIENT_MESSAGE: {
xcb_client_message_event_t *ev = (xcb_client_message_event_t *)event;
if (ev->data.data32[0] == x11->atoms.wm_delete_window) {
struct wlr_x11_output *output =
get_x11_output_from_window_id(x11, ev->window);
if (output != NULL) {
wlr_output_destroy(&output->wlr_output);
}
} else {
wlr_log(WLR_DEBUG, "Unhandled client message %"PRIu32,
ev->data.data32[0]);
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}
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break;
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}
case XCB_GE_GENERIC: {
xcb_ge_generic_event_t *ev = (xcb_ge_generic_event_t *)event;
if (ev->extension == x11->xinput_opcode) {
handle_x11_xinput_event(x11, ev);
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} else if (ev->extension == x11->present_opcode) {
handle_x11_present_event(x11, ev);
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} else {
handle_x11_unknown_event(x11, event);
}
break;
}
case 0: {
xcb_value_error_t *ev = (xcb_value_error_t *)event;
handle_x11_error(x11, ev);
break;
}
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default:
handle_x11_unknown_event(x11, event);
break;
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}
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}
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static int x11_event(int fd, uint32_t mask, void *data) {
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struct wlr_x11_backend *x11 = data;
if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) {
wl_display_terminate(x11->wl_display);
return 0;
}
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xcb_generic_event_t *e;
while ((e = xcb_poll_for_event(x11->xcb))) {
handle_x11_event(x11, e);
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free(e);
}
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return 0;
}
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struct wlr_x11_backend *get_x11_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_x11(wlr_backend));
return (struct wlr_x11_backend *)wlr_backend;
}
static bool backend_start(struct wlr_backend *backend) {
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struct wlr_x11_backend *x11 = get_x11_backend_from_backend(backend);
x11->started = true;
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wlr_signal_emit_safe(&x11->backend.events.new_input, &x11->keyboard_dev);
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for (size_t i = 0; i < x11->requested_outputs; ++i) {
wlr_x11_output_create(&x11->backend);
}
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return true;
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}
static void backend_destroy(struct wlr_backend *backend) {
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if (!backend) {
return;
}
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struct wlr_x11_backend *x11 = get_x11_backend_from_backend(backend);
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struct wlr_x11_output *output, *tmp;
wl_list_for_each_safe(output, tmp, &x11->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
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wlr_input_device_destroy(&x11->keyboard_dev);
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wlr_signal_emit_safe(&backend->events.destroy, backend);
if (x11->event_source) {
wl_event_source_remove(x11->event_source);
}
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wl_list_remove(&x11->display_destroy.link);
wlr_renderer_destroy(x11->renderer);
wlr_egl_finish(&x11->egl);
wlr_allocator_destroy(x11->allocator);
wlr_drm_format_set_finish(&x11->dri3_formats);
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free(x11->drm_format);
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#if WLR_HAS_XCB_ERRORS
xcb_errors_context_free(x11->errors_context);
#endif
if (x11->xlib_conn) {
XCloseDisplay(x11->xlib_conn);
}
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free(x11);
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}
static struct wlr_renderer *backend_get_renderer(
struct wlr_backend *backend) {
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struct wlr_x11_backend *x11 = get_x11_backend_from_backend(backend);
return x11->renderer;
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}
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static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_renderer = backend_get_renderer,
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};
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bool wlr_backend_is_x11(struct wlr_backend *backend) {
return backend->impl == &backend_impl;
}
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static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_x11_backend *x11 =
wl_container_of(listener, x11, display_destroy);
backend_destroy(&x11->backend);
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}
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static xcb_depth_t *get_depth(xcb_screen_t *screen, uint8_t depth) {
xcb_depth_iterator_t iter = xcb_screen_allowed_depths_iterator(screen);
while (iter.rem > 0) {
if (iter.data->depth == depth) {
return iter.data;
}
xcb_depth_next(&iter);
}
return NULL;
}
static xcb_visualid_t pick_visualid(xcb_depth_t *depth) {
xcb_visualtype_t *visuals = xcb_depth_visuals(depth);
for (int i = 0; i < xcb_depth_visuals_length(depth); i++) {
if (visuals[i]._class == XCB_VISUAL_CLASS_TRUE_COLOR) {
return visuals[i].visual_id;
}
}
return 0;
}
static int query_dri3_drm_fd(struct wlr_x11_backend *x11) {
xcb_dri3_open_cookie_t open_cookie =
xcb_dri3_open(x11->xcb, x11->screen->root, 0);
xcb_dri3_open_reply_t *open_reply =
xcb_dri3_open_reply(x11->xcb, open_cookie, NULL);
if (open_reply == NULL) {
return -1;
}
int *open_fds = xcb_dri3_open_reply_fds(x11->xcb, open_reply);
if (open_fds == NULL) {
free(open_reply);
return -1;
}
assert(open_reply->nfd == 1);
int drm_fd = open_fds[0];
free(open_reply);
int flags = fcntl(drm_fd, F_GETFD);
if (flags < 0) {
close(drm_fd);
return -1;
}
if (fcntl(drm_fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
close(drm_fd);
return -1;
}
if (drmGetNodeTypeFromFd(drm_fd) != DRM_NODE_RENDER) {
char *render_name = drmGetRenderDeviceNameFromFd(drm_fd);
if (render_name == NULL) {
close(drm_fd);
return -1;
}
close(drm_fd);
drm_fd = open(render_name, O_RDWR | O_CLOEXEC);
if (drm_fd < 0) {
free(render_name);
return -1;
}
free(render_name);
}
return drm_fd;
}
static bool query_dri3_modifiers(struct wlr_x11_backend *x11,
const struct wlr_x11_format *format) {
// Query the root window's supported modifiers, because we only care about
// screen_modifiers for now
xcb_dri3_get_supported_modifiers_cookie_t modifiers_cookie =
xcb_dri3_get_supported_modifiers(x11->xcb, x11->screen->root,
format->depth, format->bpp);
xcb_dri3_get_supported_modifiers_reply_t *modifiers_reply =
xcb_dri3_get_supported_modifiers_reply(x11->xcb, modifiers_cookie,
NULL);
if (!modifiers_reply) {
wlr_log(WLR_ERROR, "Failed to get DMA-BUF modifiers supported by "
"the X11 server for the format 0x%"PRIX32, format->drm);
return false;
}
// If modifiers aren't supported, DRI3 will return an empty list
const uint64_t *modifiers =
xcb_dri3_get_supported_modifiers_screen_modifiers(modifiers_reply);
int modifiers_len =
xcb_dri3_get_supported_modifiers_screen_modifiers_length(modifiers_reply);
for (int i = 0; i < modifiers_len; i++) {
wlr_drm_format_set_add(&x11->dri3_formats, format->drm, modifiers[i]);
}
free(modifiers_reply);
return true;
}
static bool query_dri3_formats(struct wlr_x11_backend *x11) {
xcb_depth_iterator_t iter = xcb_screen_allowed_depths_iterator(x11->screen);
while (iter.rem > 0) {
uint8_t depth = iter.data->depth;
const struct wlr_x11_format *format = x11_format_from_depth(depth);
if (format != NULL) {
wlr_drm_format_set_add(&x11->dri3_formats, format->drm,
DRM_FORMAT_MOD_INVALID);
if (!query_dri3_modifiers(x11, format)) {
return false;
}
}
xcb_depth_next(&iter);
}
return true;
}
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struct wlr_backend *wlr_x11_backend_create(struct wl_display *display,
const char *x11_display) {
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struct wlr_x11_backend *x11 = calloc(1, sizeof(*x11));
if (!x11) {
return NULL;
}
wlr_backend_init(&x11->backend, &backend_impl);
x11->wl_display = display;
wl_list_init(&x11->outputs);
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x11->xlib_conn = XOpenDisplay(x11_display);
if (!x11->xlib_conn) {
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wlr_log(WLR_ERROR, "Failed to open X connection");
goto error_x11;
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}
x11->xcb = XGetXCBConnection(x11->xlib_conn);
if (!x11->xcb || xcb_connection_has_error(x11->xcb)) {
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wlr_log(WLR_ERROR, "Failed to open xcb connection");
goto error_display;
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}
XSetEventQueueOwner(x11->xlib_conn, XCBOwnsEventQueue);
struct {
const char *name;
xcb_intern_atom_cookie_t cookie;
xcb_atom_t *atom;
} atom[] = {
{ .name = "WM_PROTOCOLS", .atom = &x11->atoms.wm_protocols },
{ .name = "WM_DELETE_WINDOW", .atom = &x11->atoms.wm_delete_window },
{ .name = "_NET_WM_NAME", .atom = &x11->atoms.net_wm_name },
{ .name = "UTF8_STRING", .atom = &x11->atoms.utf8_string },
{ .name = "_VARIABLE_REFRESH", .atom = &x11->atoms.variable_refresh },
};
for (size_t i = 0; i < sizeof(atom) / sizeof(atom[0]); ++i) {
atom[i].cookie = xcb_intern_atom(x11->xcb,
true, strlen(atom[i].name), atom[i].name);
}
for (size_t i = 0; i < sizeof(atom) / sizeof(atom[0]); ++i) {
xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(
x11->xcb, atom[i].cookie, NULL);
if (reply) {
*atom[i].atom = reply->atom;
free(reply);
} else {
*atom[i].atom = XCB_ATOM_NONE;
}
}
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const xcb_query_extension_reply_t *ext;
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// DRI3 extension
ext = xcb_get_extension_data(x11->xcb, &xcb_dri3_id);
if (!ext || !ext->present) {
wlr_log(WLR_ERROR, "X11 does not support DRI3 extension");
goto error_display;
}
xcb_dri3_query_version_cookie_t dri3_cookie =
xcb_dri3_query_version(x11->xcb, 1, 2);
xcb_dri3_query_version_reply_t *dri3_reply =
xcb_dri3_query_version_reply(x11->xcb, dri3_cookie, NULL);
if (!dri3_reply || dri3_reply->major_version < 1 ||
dri3_reply->minor_version < 2) {
wlr_log(WLR_ERROR, "X11 does not support required DRI3 version "
"(has %"PRIu32".%"PRIu32", want 1.2)",
dri3_reply->major_version, dri3_reply->minor_version);
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goto error_display;
}
free(dri3_reply);
// Present extension
ext = xcb_get_extension_data(x11->xcb, &xcb_present_id);
if (!ext || !ext->present) {
wlr_log(WLR_ERROR, "X11 does not support Present extension");
goto error_display;
}
x11->present_opcode = ext->major_opcode;
xcb_present_query_version_cookie_t present_cookie =
xcb_present_query_version(x11->xcb, 1, 2);
xcb_present_query_version_reply_t *present_reply =
xcb_present_query_version_reply(x11->xcb, present_cookie, NULL);
if (!present_reply || present_reply->major_version < 1) {
wlr_log(WLR_ERROR, "X11 does not support required Present version "
"(has %"PRIu32".%"PRIu32", want 1.0)",
present_reply->major_version, present_reply->minor_version);
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free(present_reply);
goto error_display;
}
free(present_reply);
// Xfixes extension
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ext = xcb_get_extension_data(x11->xcb, &xcb_xfixes_id);
if (!ext || !ext->present) {
wlr_log(WLR_ERROR, "X11 does not support Xfixes extension");
goto error_display;
}
xcb_xfixes_query_version_cookie_t fixes_cookie =
xcb_xfixes_query_version(x11->xcb, 4, 0);
xcb_xfixes_query_version_reply_t *fixes_reply =
xcb_xfixes_query_version_reply(x11->xcb, fixes_cookie, NULL);
if (!fixes_reply || fixes_reply->major_version < 4) {
wlr_log(WLR_ERROR, "X11 does not support required Xfixes version "
"(has %"PRIu32".%"PRIu32", want 4.0)",
fixes_reply->major_version, fixes_reply->minor_version);
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free(fixes_reply);
goto error_display;
}
free(fixes_reply);
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// Xinput extension
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ext = xcb_get_extension_data(x11->xcb, &xcb_input_id);
if (!ext || !ext->present) {
wlr_log(WLR_ERROR, "X11 does not support Xinput extension");
goto error_display;
}
x11->xinput_opcode = ext->major_opcode;
xcb_input_xi_query_version_cookie_t xi_cookie =
xcb_input_xi_query_version(x11->xcb, 2, 0);
xcb_input_xi_query_version_reply_t *xi_reply =
xcb_input_xi_query_version_reply(x11->xcb, xi_cookie, NULL);
if (!xi_reply || xi_reply->major_version < 2) {
wlr_log(WLR_ERROR, "X11 does not support required Xinput version "
"(has %"PRIu32".%"PRIu32", want 2.0)",
xi_reply->major_version, xi_reply->minor_version);
free(xi_reply);
goto error_display;
}
free(xi_reply);
int fd = xcb_get_file_descriptor(x11->xcb);
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struct wl_event_loop *ev = wl_display_get_event_loop(display);
uint32_t events = WL_EVENT_READABLE | WL_EVENT_ERROR | WL_EVENT_HANGUP;
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x11->event_source = wl_event_loop_add_fd(ev, fd, events, x11_event, x11);
if (!x11->event_source) {
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wlr_log(WLR_ERROR, "Could not create event source");
goto error_display;
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}
wl_event_source_check(x11->event_source);
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x11->screen = xcb_setup_roots_iterator(xcb_get_setup(x11->xcb)).data;
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if (!x11->screen) {
wlr_log(WLR_ERROR, "Failed to get X11 screen");
goto error_event;
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}
x11->depth = get_depth(x11->screen, 32);
if (!x11->depth) {
wlr_log(WLR_ERROR, "Failed to get 32-bit depth for X11 screen");
goto error_event;
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}
x11->visualid = pick_visualid(x11->depth);
if (!x11->visualid) {
wlr_log(WLR_ERROR, "Failed to pick X11 visual");
goto error_event;
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}
x11->x11_format = x11_format_from_depth(x11->depth->depth);
if (!x11->x11_format) {
wlr_log(WLR_ERROR, "Unsupported depth %"PRIu8, x11->depth->depth);
goto error_event;
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}
x11->colormap = xcb_generate_id(x11->xcb);
xcb_create_colormap(x11->xcb, XCB_COLORMAP_ALLOC_NONE, x11->colormap,
x11->screen->root, x11->visualid);
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// DRI3 may return a render node (Xwayland) or an authenticated primary
// node (plain Glamor).
int drm_fd = query_dri3_drm_fd(x11);
if (drm_fd < 0) {
wlr_log(WLR_ERROR, "Failed to query DRI3 DRM FD");
goto error_event;
}
struct wlr_gbm_allocator *gbm_alloc = wlr_gbm_allocator_create(drm_fd);
if (gbm_alloc == NULL) {
wlr_log(WLR_ERROR, "Failed to create GBM allocator");
close(drm_fd);
goto error_event;
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}
x11->allocator = &gbm_alloc->base;
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x11->renderer = wlr_renderer_autocreate(&x11->egl, EGL_PLATFORM_GBM_KHR,
gbm_alloc->gbm_device);
if (x11->renderer == NULL) {
wlr_log(WLR_ERROR, "Failed to create renderer");
goto error_event;
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}
const struct wlr_drm_format_set *render_formats =
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wlr_renderer_get_dmabuf_render_formats(x11->renderer);
if (render_formats == NULL) {
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wlr_log(WLR_ERROR, "Failed to get available DMA-BUF formats from renderer");
return false;
}
const struct wlr_drm_format *render_format =
wlr_drm_format_set_get(render_formats, x11->x11_format->drm);
if (render_format == NULL) {
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wlr_log(WLR_ERROR, "Renderer doesn't support DRM format 0x%"PRIX32,
x11->x11_format->drm);
return false;
}
if (!query_dri3_formats(x11)) {
wlr_log(WLR_ERROR, "Failed to query supported DRI3 formats");
return false;
}
const struct wlr_drm_format *dri3_format =
wlr_drm_format_set_get(&x11->dri3_formats, x11->x11_format->drm);
if (dri3_format == NULL) {
wlr_log(WLR_ERROR, "X11 server doesn't support DRM format 0x%"PRIX32,
x11->x11_format->drm);
return false;
}
x11->drm_format = wlr_drm_format_intersect(dri3_format, render_format);
if (x11->drm_format == NULL) {
wlr_log(WLR_ERROR, "Failed to intersect DRI3 and render modifiers for "
"format 0x%"PRIX32, x11->x11_format->drm);
return false;
}
2020-11-18 19:21:03 +01:00
#if WLR_HAS_XCB_ERRORS
if (xcb_errors_context_new(x11->xcb, &x11->errors_context) != 0) {
wlr_log(WLR_ERROR, "Failed to create error context");
return false;
}
#endif
2017-12-07 23:44:59 +01:00
wlr_input_device_init(&x11->keyboard_dev, WLR_INPUT_DEVICE_KEYBOARD,
&input_device_impl, "X11 keyboard", 0, 0);
wlr_keyboard_init(&x11->keyboard, &keyboard_impl);
2017-12-07 23:44:59 +01:00
x11->keyboard_dev.keyboard = &x11->keyboard;
x11->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &x11->display_destroy);
return &x11->backend;
error_event:
wl_event_source_remove(x11->event_source);
error_display:
2017-12-07 23:44:59 +01:00
XCloseDisplay(x11->xlib_conn);
error_x11:
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free(x11);
return NULL;
}
static void handle_x11_error(struct wlr_x11_backend *x11, xcb_value_error_t *ev) {
#if WLR_HAS_XCB_ERRORS
const char *major_name = xcb_errors_get_name_for_major_code(
x11->errors_context, ev->major_opcode);
if (!major_name) {
wlr_log(WLR_DEBUG, "X11 error happened, but could not get major name");
goto log_raw;
}
const char *minor_name = xcb_errors_get_name_for_minor_code(
x11->errors_context, ev->major_opcode, ev->minor_opcode);
const char *extension;
const char *error_name = xcb_errors_get_name_for_error(x11->errors_context,
ev->error_code, &extension);
if (!error_name) {
wlr_log(WLR_DEBUG, "X11 error happened, but could not get error name");
goto log_raw;
}
wlr_log(WLR_ERROR, "X11 error: op %s (%s), code %s (%s), "
"sequence %"PRIu16", value %"PRIu32,
major_name, minor_name ? minor_name : "no minor",
error_name, extension ? extension : "no extension",
ev->sequence, ev->bad_value);
return;
log_raw:
#endif
wlr_log(WLR_ERROR, "X11 error: op %"PRIu8":%"PRIu16", code %"PRIu8", "
"sequence %"PRIu16", value %"PRIu32,
ev->major_opcode, ev->minor_opcode, ev->error_code,
ev->sequence, ev->bad_value);
}
2020-11-19 10:18:31 +01:00
static void handle_x11_unknown_event(struct wlr_x11_backend *x11,
xcb_generic_event_t *ev) {
#if WLR_HAS_XCB_ERRORS
const char *extension;
const char *event_name = xcb_errors_get_name_for_xcb_event(
x11->errors_context, ev, &extension);
if (!event_name) {
wlr_log(WLR_DEBUG, "No name for unhandled event: %u",
ev->response_type);
return;
}
wlr_log(WLR_DEBUG, "Unhandled X11 event: %s (%u)", event_name, ev->response_type);
#else
wlr_log(WLR_DEBUG, "Unhandled X11 event: %u", ev->response_type);
#endif
}