diff options
Diffstat (limited to 'backend/x11/backend.c')
| -rw-r--r-- | backend/x11/backend.c | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/backend/x11/backend.c b/backend/x11/backend.c new file mode 100644 index 00000000..88c022d1 --- /dev/null +++ b/backend/x11/backend.c @@ -0,0 +1,336 @@ +#define _POSIX_C_SOURCE 199309L +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <time.h> +#include <EGL/egl.h> +#include <wayland-server.h> +#include <xcb/xcb.h> +#include <xcb/glx.h> +#include <X11/Xlib-xcb.h> +#include <linux/input-event-codes.h> +#include <wlr/backend/interface.h> +#include <wlr/backend/x11.h> +#include <wlr/egl.h> +#include <wlr/interfaces/wlr_output.h> +#include <wlr/interfaces/wlr_input_device.h> +#include <wlr/interfaces/wlr_keyboard.h> +#include <wlr/interfaces/wlr_pointer.h> +#include <wlr/util/log.h> +#include "backend/x11.h" + +static struct wlr_backend_impl backend_impl; +static struct wlr_output_impl output_impl; + +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; + } +} + +static bool handle_x11_event(struct wlr_x11_backend *x11, xcb_generic_event_t *event) { + struct wlr_x11_output *output = &x11->output; + + switch (event->response_type) { + case XCB_EXPOSE: { + wl_signal_emit(&output->wlr_output.events.frame, output); + break; + } + case XCB_KEY_PRESS: + case XCB_KEY_RELEASE: { + xcb_key_press_event_t *ev = (xcb_key_press_event_t *)event; + struct wlr_event_keyboard_key key = { + .time_sec = ev->time / 1000, + .time_usec = (ev->time % 1000) * 1000, + .keycode = ev->detail - 8, + .state = event->response_type == XCB_KEY_PRESS ? + WLR_KEY_PRESSED : WLR_KEY_RELEASED, + }; + + wl_signal_emit(&x11->keyboard.events.key, &key); + x11->time = ev->time; + break; + } + case XCB_BUTTON_PRESS: + case XCB_BUTTON_RELEASE: { + xcb_button_press_event_t *ev = (xcb_button_press_event_t *)event; + struct wlr_event_pointer_button button = { + .device = &x11->pointer_dev, + .time_sec = ev->time / 1000, + .time_usec = (ev->time % 1000) * 1000, + .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); + x11->time = ev->time; + break; + } + case XCB_MOTION_NOTIFY: { + xcb_motion_notify_event_t *ev = (xcb_motion_notify_event_t *)event; + struct wlr_event_pointer_motion_absolute abs = { + .device = &x11->pointer_dev, + .time_sec = ev->time / 1000, + .time_usec = (ev->time % 1000) * 1000, + .x_mm = ev->event_x, + .y_mm = ev->event_y, + .width_mm = output->wlr_output.width, + .height_mm = output->wlr_output.height, + }; + + wl_signal_emit(&x11->pointer.events.motion_absolute, &abs); + x11->time = ev->time; + break; + } + case XCB_CONFIGURE_NOTIFY: { + xcb_configure_notify_event_t *ev = (xcb_configure_notify_event_t *)event; + + output->wlr_output.width = ev->width; + output->wlr_output.height = ev->height; + wlr_output_update_matrix(&output->wlr_output); + wl_signal_emit(&output->wlr_output.events.resolution, output); + + // 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, + .time_sec = x11->time / 1000, + .time_usec = (x11->time % 1000) * 1000, + .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; + } + case XCB_GLX_DELETE_QUERIES_ARB: { + wl_display_terminate(x11->wl_display); + return true; + break; + } + default: + break; + } + + return false; +} + +static int x11_event(int fd, uint32_t mask, void *data) { + struct wlr_x11_backend *x11 = data; + xcb_generic_event_t *e; + bool quit = false; + + while (!quit && (e = xcb_poll_for_event(x11->xcb_conn))) { + quit = handle_x11_event(x11, e); + free(e); + } + + return 0; +} + +static int signal_frame(void *data) { + 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; +} + +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); +} + +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); + x11->event_source = wl_event_loop_add_fd(ev, fd, WL_EVENT_READABLE, 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->screen->root_visual, x11->xlib_conn)) { + 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; + + 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; +} + +static bool wlr_x11_backend_start(struct wlr_backend *backend) { + struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend; + struct wlr_x11_output *output = &x11->output; + + uint32_t mask = XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK; + uint32_t values[2] = { + x11->screen->white_pixel, + XCB_EVENT_MASK_EXPOSURE | + 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 + }; + + output->x11 = x11; + + wlr_output_init(&output->wlr_output, &output_impl); + snprintf(output->wlr_output.name, sizeof(output->wlr_output.name), "X11-1"); + + output->win = xcb_generate_id(x11->xcb_conn); + 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, + x11->screen->root_visual, mask, values); + + output->surf = wlr_egl_create_surface(&x11->egl, &output->win); + if (!output->surf) { + wlr_log(L_ERROR, "Failed to create EGL surface"); + return false; + } + + 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); + + xcb_map_window(x11->xcb_conn, output->win); + xcb_flush(x11->xcb_conn); + + wl_signal_emit(&x11->backend.events.output_add, output); + wl_signal_emit(&x11->backend.events.input_add, &x11->keyboard_dev); + wl_signal_emit(&x11->backend.events.input_add, &x11->pointer_dev); + + wl_event_source_timer_update(x11->frame_timer, 16); + + return true; +} + +static void wlr_x11_backend_destroy(struct wlr_backend *backend) { + if (!backend) { + return; + } + + struct wlr_x11_backend *x11 = (struct wlr_x11_backend *)backend; + + wl_event_source_remove(x11->frame_timer); + wlr_egl_free(&x11->egl); + + xcb_disconnect(x11->xcb_conn); + free(x11); +} + +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; +} + +bool wlr_backend_is_x11(struct wlr_backend *backend) { + return backend->impl == &backend_impl; +} + +static struct wlr_backend_impl backend_impl = { + .start = wlr_x11_backend_start, + .destroy = wlr_x11_backend_destroy, + .get_egl = wlr_x11_backend_get_egl, +}; + +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; +} + +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); +} + +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 = { + .transform = output_transform, + .destroy = output_destroy, + .make_current = output_make_current, + .swap_buffers = output_swap_buffers, +}; 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