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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <EGL/egl.h>
#include <wayland-server.h>
#include <xcb/xcb.h>
#include <X11/Xlib-xcb.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/x11.h>
#include <wlr/egl.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/util/log.h>
#include "backend/x11.h"
static struct wlr_backend_impl backend_impl;
int x11_event(int fd, uint32_t mask, void *data) {
struct wlr_x11_backend *x11 = data;
xcb_generic_event_t *event = xcb_wait_for_event(x11->xcb_conn);
if (!event) {
return 0;
}
switch (event->response_type) {
struct wlr_x11_output *output;
case XCB_EXPOSE:
output = &x11->output;
wl_signal_emit(&output->wlr_output.events.frame, output);
break;
case XCB_KEY_PRESS:
break;
default:
wlr_log(L_INFO, "Unknown event");
break;
}
free(event);
return 0;
}
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->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;
}
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->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;
}
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 struct wlr_output_impl output_impl;
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
};
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;
}
xcb_map_window(x11->xcb_conn, output->win);
xcb_flush(x11->xcb_conn);
wl_signal_emit(&x11->backend.events.output_add, output);
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;
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 *output, enum wl_output_transform transform) {
// TODO
}
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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