wlroots/backend/x11/backend.c

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C
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#define _POSIX_C_SOURCE 200112L
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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 <EGL/egl.h>
#include <wayland-server.h>
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#include <xcb/xcb.h>
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#include <xcb/glx.h>
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#include <X11/Xlib-xcb.h>
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#ifdef __linux__
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#include <linux/input-event-codes.h>
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#elif __FreeBSD__
#include <dev/evdev/input-event-codes.h>
#endif
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#include <wlr/backend/interface.h>
#include <wlr/backend/x11.h>
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#include <wlr/render/egl.h>
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#include <wlr/interfaces/wlr_output.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/util/log.h>
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#include "backend/x11.h"
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static struct wlr_backend_impl backend_impl;
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static struct wlr_output_impl output_impl;
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static uint32_t xcb_button_to_wl(uint32_t button) {
switch (button) {
case XCB_BUTTON_INDEX_1: return BTN_LEFT;
case XCB_BUTTON_INDEX_2: return BTN_MIDDLE;
case XCB_BUTTON_INDEX_3: return BTN_RIGHT;
// XXX: I'm not sure the scroll-wheel direction is right
case XCB_BUTTON_INDEX_4: return BTN_GEAR_UP;
case XCB_BUTTON_INDEX_5: return BTN_GEAR_DOWN;
default: return 0;
}
}
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static bool handle_x11_event(struct wlr_x11_backend *x11, xcb_generic_event_t *event) {
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struct wlr_x11_output *output = &x11->output;
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switch (event->response_type) {
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case XCB_EXPOSE: {
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wl_signal_emit(&output->wlr_output.events.frame, output);
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break;
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}
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case XCB_KEY_PRESS:
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case XCB_KEY_RELEASE: {
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xcb_key_press_event_t *ev = (xcb_key_press_event_t *)event;
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struct wlr_event_keyboard_key key = {
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.time_msec = ev->time,
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.keycode = ev->detail - 8,
.state = event->response_type == XCB_KEY_PRESS ?
WLR_KEY_PRESSED : WLR_KEY_RELEASED,
.update_state = true,
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};
// TODO use xcb-xkb for more precise modifiers state?
wlr_keyboard_notify_key(&x11->keyboard, &key);
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x11->time = ev->time;
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break;
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}
case XCB_BUTTON_PRESS: {
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xcb_button_press_event_t *ev = (xcb_button_press_event_t *)event;
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if (ev->detail == XCB_BUTTON_INDEX_4 ||
ev->detail == XCB_BUTTON_INDEX_5) {
double delta = (ev->detail == XCB_BUTTON_INDEX_4 ? -15 : 15);
struct wlr_event_pointer_axis axis = {
.device = &x11->pointer_dev,
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.time_msec = ev->time,
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.source = WLR_AXIS_SOURCE_WHEEL,
.orientation = WLR_AXIS_ORIENTATION_VERTICAL,
.delta = delta,
};
wl_signal_emit(&x11->pointer.events.axis, &axis);
x11->time = ev->time;
break;
}
}
/* fallthrough */
case XCB_BUTTON_RELEASE: {
xcb_button_press_event_t *ev = (xcb_button_press_event_t *)event;
if (ev->detail != XCB_BUTTON_INDEX_4 &&
ev->detail != XCB_BUTTON_INDEX_5) {
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struct wlr_event_pointer_button button = {
.device = &x11->pointer_dev,
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.time_msec = ev->time,
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.button = xcb_button_to_wl(ev->detail),
.state = event->response_type == XCB_BUTTON_PRESS ?
WLR_BUTTON_PRESSED : WLR_BUTTON_RELEASED,
};
wl_signal_emit(&x11->pointer.events.button, &button);
}
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x11->time = ev->time;
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break;
}
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case XCB_MOTION_NOTIFY: {
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xcb_motion_notify_event_t *ev = (xcb_motion_notify_event_t *)event;
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struct wlr_event_pointer_motion_absolute abs = {
.device = &x11->pointer_dev,
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.time_msec = ev->time,
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.x_mm = ev->event_x,
.y_mm = ev->event_y,
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.width_mm = output->wlr_output.width,
.height_mm = output->wlr_output.height,
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};
wl_signal_emit(&x11->pointer.events.motion_absolute, &abs);
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x11->time = ev->time;
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break;
}
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case XCB_CONFIGURE_NOTIFY: {
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xcb_configure_notify_event_t *ev = (xcb_configure_notify_event_t *)event;
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wlr_output_update_custom_mode(&output->wlr_output, ev->width,
ev->height, 0);
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// Move the pointer to its new location
xcb_query_pointer_cookie_t cookie =
xcb_query_pointer(x11->xcb_conn, output->win);
xcb_query_pointer_reply_t *pointer =
xcb_query_pointer_reply(x11->xcb_conn, cookie, NULL);
if (!pointer) {
break;
}
struct wlr_event_pointer_motion_absolute abs = {
.device = &x11->pointer_dev,
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.time_msec = x11->time,
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.x_mm = pointer->root_x,
.y_mm = pointer->root_y,
.width_mm = output->wlr_output.width,
.height_mm = output->wlr_output.height,
};
wl_signal_emit(&x11->pointer.events.motion_absolute, &abs);
break;
}
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case XCB_GLX_DELETE_QUERIES_ARB: {
wl_display_terminate(x11->wl_display);
return true;
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break;
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}
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default:
break;
}
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return false;
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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;
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bool quit = false;
while (!quit && (e = xcb_poll_for_event(x11->xcb_conn))) {
quit = handle_x11_event(x11, e);
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free(e);
}
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return 0;
}
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static int signal_frame(void *data) {
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struct wlr_x11_backend *x11 = data;
wl_signal_emit(&x11->output.wlr_output.events.frame, &x11->output);
wl_event_source_timer_update(x11->frame_timer, 16);
return 0;
}
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static void init_atom(struct wlr_x11_backend *x11, struct wlr_x11_atom *atom,
uint8_t only_if_exists, const char *name) {
atom->cookie = xcb_intern_atom(x11->xcb_conn, only_if_exists, strlen(name), name);
atom->reply = xcb_intern_atom_reply(x11->xcb_conn, atom->cookie, NULL);
}
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static bool wlr_x11_backend_start(struct wlr_backend *backend) {
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struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend;
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struct wlr_x11_output *output = &x11->output;
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uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK;
uint32_t values[2] = {
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x11->screen->white_pixel,
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XCB_EVENT_MASK_EXPOSURE |
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XCB_EVENT_MASK_KEY_PRESS | XCB_EVENT_MASK_KEY_RELEASE |
XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE |
XCB_EVENT_MASK_POINTER_MOTION |
XCB_EVENT_MASK_STRUCTURE_NOTIFY
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};
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output->x11 = x11;
wlr_output_init(&output->wlr_output, &x11->backend, &output_impl);
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snprintf(output->wlr_output.name, sizeof(output->wlr_output.name), "X11-1");
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output->win = xcb_generate_id(x11->xcb_conn);
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xcb_create_window(x11->xcb_conn, XCB_COPY_FROM_PARENT, output->win,
x11->screen->root, 0, 0, 1024, 768, 1, XCB_WINDOW_CLASS_INPUT_OUTPUT,
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x11->screen->root_visual, mask, values);
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output->surf = wlr_egl_create_surface(&x11->egl, &output->win);
if (!output->surf) {
wlr_log(L_ERROR, "Failed to create EGL surface");
return false;
}
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init_atom(x11, &x11->atoms.wm_protocols, 1, "WM_PROTOCOLS");
init_atom(x11, &x11->atoms.wm_delete_window, 0, "WM_DELETE_WINDOW");
xcb_change_property(x11->xcb_conn, XCB_PROP_MODE_REPLACE, output->win,
x11->atoms.wm_protocols.reply->atom, XCB_ATOM_ATOM, 32, 1,
&x11->atoms.wm_delete_window.reply->atom);
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xcb_map_window(x11->xcb_conn, output->win);
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xcb_flush(x11->xcb_conn);
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wlr_output_create_global(&output->wlr_output, x11->wl_display);
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wl_signal_emit(&x11->backend.events.output_add, output);
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wl_signal_emit(&x11->backend.events.input_add, &x11->keyboard_dev);
wl_signal_emit(&x11->backend.events.input_add, &x11->pointer_dev);
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wl_event_source_timer_update(x11->frame_timer, 16);
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return true;
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}
static void wlr_x11_backend_destroy(struct wlr_backend *backend) {
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if (!backend) {
return;
}
struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend;
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struct wlr_x11_output *output = &x11->output;
wlr_output_destroy(&output->wlr_output);
wl_signal_emit(&backend->events.input_remove, &x11->pointer_dev);
wl_signal_emit(&backend->events.input_remove, &x11->keyboard_dev);
// TODO probably need to use wlr_keyboard_destroy, but the devices need to
// be malloced for that to work
if (x11->keyboard_dev.keyboard->keymap) {
xkb_keymap_unref(x11->keyboard_dev.keyboard->keymap);
}
if (x11->keyboard_dev.keyboard->xkb_state) {
xkb_state_unref(x11->keyboard_dev.keyboard->xkb_state);
}
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wl_list_remove(&x11->display_destroy.link);
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wl_event_source_remove(x11->frame_timer);
wlr_egl_finish(&x11->egl);
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xcb_disconnect(x11->xcb_conn);
free(x11);
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}
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static struct wlr_egl *wlr_x11_backend_get_egl(struct wlr_backend *backend) {
struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend;
return &x11->egl;
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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 struct wlr_backend_impl backend_impl = {
.start = wlr_x11_backend_start,
.destroy = wlr_x11_backend_destroy,
.get_egl = wlr_x11_backend_get_egl,
};
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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);
wlr_x11_backend_destroy(&x11->backend);
}
struct wlr_backend *wlr_x11_backend_create(struct wl_display *display,
const char *x11_display) {
struct wlr_x11_backend *x11 = calloc(1, sizeof(*x11));
if (!x11) {
return NULL;
}
wlr_backend_init(&x11->backend, &backend_impl);
x11->wl_display = display;
x11->xlib_conn = XOpenDisplay(x11_display);
if (!x11->xlib_conn) {
wlr_log(L_ERROR, "Failed to open X connection");
return NULL;
}
x11->xcb_conn = XGetXCBConnection(x11->xlib_conn);
if (!x11->xcb_conn || xcb_connection_has_error(x11->xcb_conn)) {
wlr_log(L_ERROR, "Failed to open xcb connection");
goto error_x11;
}
XSetEventQueueOwner(x11->xlib_conn, XCBOwnsEventQueue);
int fd = xcb_get_file_descriptor(x11->xcb_conn);
struct wl_event_loop *ev = wl_display_get_event_loop(display);
int events = WL_EVENT_READABLE | WL_EVENT_ERROR | WL_EVENT_HANGUP;
x11->event_source = wl_event_loop_add_fd(ev, fd, events, x11_event, x11);
if (!x11->event_source) {
wlr_log(L_ERROR, "Could not create event source");
goto error_x11;
}
x11->frame_timer = wl_event_loop_add_timer(ev, signal_frame, x11);
x11->screen = xcb_setup_roots_iterator(xcb_get_setup(x11->xcb_conn)).data;
if (!wlr_egl_init(&x11->egl, EGL_PLATFORM_X11_KHR, x11->xlib_conn, NULL,
x11->screen->root_visual)) {
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goto error_event;
}
wlr_input_device_init(&x11->keyboard_dev, WLR_INPUT_DEVICE_KEYBOARD,
NULL, "X11 keyboard", 0, 0);
wlr_keyboard_init(&x11->keyboard, NULL);
x11->keyboard_dev.keyboard = &x11->keyboard;
wlr_input_device_init(&x11->pointer_dev, WLR_INPUT_DEVICE_POINTER,
NULL, "X11 pointer", 0, 0);
wlr_pointer_init(&x11->pointer, NULL);
x11->pointer_dev.pointer = &x11->pointer;
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_x11:
xcb_disconnect(x11->xcb_conn);
XCloseDisplay(x11->xlib_conn);
free(x11);
return NULL;
}
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static bool output_set_custom_mode(struct wlr_output *wlr_output, int32_t width,
int32_t height, int32_t refresh) {
struct wlr_x11_output *output = (struct wlr_x11_output *)wlr_output;
struct wlr_x11_backend *x11 = output->x11;
const uint32_t values[] = { width, height };
xcb_configure_window(x11->xcb_conn, output->win,
XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT, values);
return true;
}
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static void output_transform(struct wlr_output *wlr_output, enum wl_output_transform transform) {
struct wlr_x11_output *output = (struct wlr_x11_output *)wlr_output;
output->wlr_output.transform = transform;
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}
static void output_destroy(struct wlr_output *wlr_output) {
struct wlr_x11_output *output = (struct wlr_x11_output *)wlr_output;
struct wlr_x11_backend *x11 = output->x11;
eglDestroySurface(x11->egl.display, output->surf);
xcb_destroy_window(x11->xcb_conn, output->win);
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// output has been allocated on the stack, do not free it
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}
static void output_make_current(struct wlr_output *wlr_output) {
struct wlr_x11_output *output = (struct wlr_x11_output *)wlr_output;
struct wlr_x11_backend *x11 = output->x11;
if (!eglMakeCurrent(x11->egl.display, output->surf, output->surf, x11->egl.context)) {
wlr_log(L_ERROR, "eglMakeCurrent failed: %s", egl_error());
}
}
static void output_swap_buffers(struct wlr_output *wlr_output) {
struct wlr_x11_output *output = (struct wlr_x11_output *)wlr_output;
struct wlr_x11_backend *x11 = output->x11;
if (!eglSwapBuffers(x11->egl.display, output->surf)) {
wlr_log(L_ERROR, "eglSwapBuffers failed: %s", egl_error());
}
}
static struct wlr_output_impl output_impl = {
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.set_custom_mode = output_set_custom_mode,
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.transform = output_transform,
.destroy = output_destroy,
.make_current = output_make_current,
.swap_buffers = output_swap_buffers,
};
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bool wlr_output_is_x11(struct wlr_output *wlr_output) {
return wlr_output->impl == &output_impl;
}