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#define _POSIX_C_SOURCE 200112L
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#include <getopt.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <time.h>
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#include <unistd.h>
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#include <wayland-server.h>
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#include <wlr/backend.h>
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#include <wlr/render/wlr_renderer.h>
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#include <wlr/types/wlr_cursor.h>
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#include <wlr/types/wlr_compositor.h>
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#include <wlr/types/wlr_data_device.h>
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#include <wlr/types/wlr_input_device.h>
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#include <wlr/types/wlr_keyboard.h>
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#include <wlr/types/wlr_linux_dmabuf_v1.h>
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#include <wlr/types/wlr_matrix.h>
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#include <wlr/types/wlr_output.h>
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#include <wlr/types/wlr_output_layout.h>
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#include <wlr/types/wlr_pointer.h>
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#include <wlr/types/wlr_seat.h>
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#include <wlr/types/wlr_xcursor_manager.h>
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#include <wlr/types/wlr_xdg_shell.h>
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#include <wlr/util/log.h>
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#include <xkbcommon/xkbcommon.h>
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/* For brevity's sake, struct members are annotated where they are used. */
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enum tinywl_cursor_mode {
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TINYWL_CURSOR_PASSTHROUGH,
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TINYWL_CURSOR_MOVE,
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TINYWL_CURSOR_RESIZE,
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};
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struct tinywl_server {
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struct wl_display *wl_display;
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struct wlr_backend *backend;
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struct wlr_renderer *renderer;
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struct wlr_xdg_shell *xdg_shell;
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struct wl_listener new_xdg_surface;
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struct wl_list views;
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struct wlr_cursor *cursor;
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struct wlr_xcursor_manager *cursor_mgr;
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struct wl_listener cursor_motion;
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struct wl_listener cursor_motion_absolute;
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struct wl_listener cursor_button;
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struct wl_listener cursor_axis;
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struct wlr_seat *seat;
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struct wl_listener new_input;
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struct wl_listener request_cursor;
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struct wl_list keyboards;
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enum tinywl_cursor_mode cursor_mode;
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struct tinywl_view *grabbed_view;
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double grab_x, grab_y;
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int grab_width, grab_height;
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uint32_t resize_edges;
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struct wlr_output_layout *output_layout;
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struct wl_list outputs;
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struct wl_listener new_output;
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};
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struct tinywl_output {
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struct wl_list link;
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struct tinywl_server *server;
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struct wlr_output *wlr_output;
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struct wl_listener frame;
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};
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struct tinywl_view {
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struct wl_list link;
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struct tinywl_server *server;
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struct wlr_xdg_surface *xdg_surface;
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struct wl_listener map;
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struct wl_listener unmap;
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struct wl_listener destroy;
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struct wl_listener request_move;
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struct wl_listener request_resize;
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bool mapped;
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int x, y;
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};
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struct tinywl_keyboard {
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struct wl_list link;
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struct tinywl_server *server;
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struct wlr_input_device *device;
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struct wl_listener modifiers;
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struct wl_listener key;
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};
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struct tinywl_pointer {
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struct wl_list link;
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struct tinywl_server *server;
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struct wlr_input_device *device;
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};
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static void focus_view(struct tinywl_view *view, struct wlr_surface *surface) {
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/* Note: this function only deals with keyboard focus. */
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if (view == NULL) {
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return;
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}
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struct tinywl_server *server = view->server;
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struct wlr_seat *seat = server->seat;
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struct wlr_surface *prev_surface = seat->keyboard_state.focused_surface;
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if (prev_surface == surface) {
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/* Don't re-focus an already focused surface. */
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return;
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}
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if (prev_surface) {
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/*
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* Deactivate the previously focused surface. This lets the client know
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* it no longer has focus and the client will repaint accordingly, e.g.
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* stop displaying a caret.
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*/
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struct wlr_xdg_surface *previous = wlr_xdg_surface_from_wlr_surface(
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seat->keyboard_state.focused_surface);
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wlr_xdg_toplevel_set_activated(previous, false);
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}
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struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat);
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/* Move the view to the front */
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wl_list_remove(&view->link);
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wl_list_insert(&server->views, &view->link);
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/* Activate the new surface */
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wlr_xdg_toplevel_set_activated(view->xdg_surface, true);
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/*
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* Tell the seat to have the keyboard enter this surface. wlroots will keep
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* track of this and automatically send key events to the appropriate
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* clients without additional work on your part.
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*/
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wlr_seat_keyboard_notify_enter(seat, view->xdg_surface->surface,
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keyboard->keycodes, keyboard->num_keycodes, &keyboard->modifiers);
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}
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static void keyboard_handle_modifiers(
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struct wl_listener *listener, void *data) {
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/* This event is raised when a modifier key, such as shift or alt, is
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* pressed. We simply communicate this to the client. */
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struct tinywl_keyboard *keyboard =
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wl_container_of(listener, keyboard, modifiers);
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/*
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* A seat can only have one keyboard, but this is a limitation of the
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* Wayland protocol - not wlroots. We assign all connected keyboards to the
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* same seat. You can swap out the underlying wlr_keyboard like this and
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* wlr_seat handles this transparently.
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*/
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wlr_seat_set_keyboard(keyboard->server->seat, keyboard->device);
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/* Send modifiers to the client. */
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wlr_seat_keyboard_notify_modifiers(keyboard->server->seat,
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&keyboard->device->keyboard->modifiers);
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}
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static bool handle_keybinding(struct tinywl_server *server, xkb_keysym_t sym) {
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/*
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* Here we handle compositor keybindings. This is when the compositor is
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* processing keys, rather than passing them on to the client for its own
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* processing.
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*
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* This function assumes Alt is held down.
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*/
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switch (sym) {
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case XKB_KEY_Escape:
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wl_display_terminate(server->wl_display);
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break;
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case XKB_KEY_F1:
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/* Cycle to the next view */
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if (wl_list_length(&server->views) < 2) {
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break;
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}
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struct tinywl_view *current_view = wl_container_of(
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server->views.next, current_view, link);
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struct tinywl_view *next_view = wl_container_of(
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current_view->link.next, next_view, link);
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focus_view(next_view, next_view->xdg_surface->surface);
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/* Move the previous view to the end of the list */
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wl_list_remove(¤t_view->link);
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wl_list_insert(server->views.prev, ¤t_view->link);
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break;
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default:
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return false;
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}
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return true;
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}
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static void keyboard_handle_key(
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struct wl_listener *listener, void *data) {
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/* This event is raised when a key is pressed or released. */
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struct tinywl_keyboard *keyboard =
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wl_container_of(listener, keyboard, key);
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struct tinywl_server *server = keyboard->server;
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struct wlr_event_keyboard_key *event = data;
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struct wlr_seat *seat = server->seat;
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/* Translate libinput keycode -> xkbcommon */
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uint32_t keycode = event->keycode + 8;
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/* Get a list of keysyms based on the keymap for this keyboard */
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const xkb_keysym_t *syms;
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int nsyms = xkb_state_key_get_syms(
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keyboard->device->keyboard->xkb_state, keycode, &syms);
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bool handled = false;
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uint32_t modifiers = wlr_keyboard_get_modifiers(keyboard->device->keyboard);
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if ((modifiers & WLR_MODIFIER_ALT) && event->state == WLR_KEY_PRESSED) {
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/* If alt is held down and this button was _pressed_, we attempt to
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* process it as a compositor keybinding. */
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for (int i = 0; i < nsyms; i++) {
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handled = handle_keybinding(server, syms[i]);
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}
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}
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if (!handled) {
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/* Otherwise, we pass it along to the client. */
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wlr_seat_set_keyboard(seat, keyboard->device);
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wlr_seat_keyboard_notify_key(seat, event->time_msec,
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event->keycode, event->state);
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}
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}
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static void server_new_keyboard(struct tinywl_server *server,
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struct wlr_input_device *device) {
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struct tinywl_keyboard *keyboard =
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calloc(1, sizeof(struct tinywl_keyboard));
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keyboard->server = server;
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keyboard->device = device;
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/* We need to prepare an XKB keymap and assign it to the keyboard. This
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* assumes the defaults (e.g. layout = "us"). */
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struct xkb_rule_names rules = { 0 };
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struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS);
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struct xkb_keymap *keymap = xkb_map_new_from_names(context, &rules,
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XKB_KEYMAP_COMPILE_NO_FLAGS);
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wlr_keyboard_set_keymap(device->keyboard, keymap);
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xkb_keymap_unref(keymap);
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xkb_context_unref(context);
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wlr_keyboard_set_repeat_info(device->keyboard, 25, 600);
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/* Here we set up listeners for keyboard events. */
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keyboard->modifiers.notify = keyboard_handle_modifiers;
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wl_signal_add(&device->keyboard->events.modifiers, &keyboard->modifiers);
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keyboard->key.notify = keyboard_handle_key;
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wl_signal_add(&device->keyboard->events.key, &keyboard->key);
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wlr_seat_set_keyboard(server->seat, device);
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/* And add the keyboard to our list of keyboards */
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wl_list_insert(&server->keyboards, &keyboard->link);
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}
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static void server_new_pointer(struct tinywl_server *server,
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struct wlr_input_device *device) {
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/* We don't do anything special with pointers. All of our pointer handling
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* is proxied through wlr_cursor. On another compositor, you might take this
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* opportunity to do libinput configuration on the device to set
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* acceleration, etc. */
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wlr_cursor_attach_input_device(server->cursor, device);
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}
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static void server_new_input(struct wl_listener *listener, void *data) {
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/* This event is raised by the backend when a new input device becomes
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* available. */
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struct tinywl_server *server =
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wl_container_of(listener, server, new_input);
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struct wlr_input_device *device = data;
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switch (device->type) {
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case WLR_INPUT_DEVICE_KEYBOARD:
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server_new_keyboard(server, device);
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break;
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case WLR_INPUT_DEVICE_POINTER:
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server_new_pointer(server, device);
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break;
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}
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/* We need to let the wlr_seat know what our capabilities are, which is
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* communiciated to the client. In TinyWL we always have a cursor, even if
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* there are no pointer devices, so we always include that capability. */
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uint32_t caps = WL_SEAT_CAPABILITY_POINTER;
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if (!wl_list_empty(&server->keyboards)) {
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caps |= WL_SEAT_CAPABILITY_KEYBOARD;
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}
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wlr_seat_set_capabilities(server->seat, caps);
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}
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static void seat_request_cursor(struct wl_listener *listener, void *data) {
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struct tinywl_server *server = wl_container_of(
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listener, server, request_cursor);
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/* This event is rasied by the seat when a client provides a cursor image */
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struct wlr_seat_pointer_request_set_cursor_event *event = data;
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struct wlr_seat_client *focused_client =
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server->seat->pointer_state.focused_client;
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/* This can be sent by any client, so we check to make sure this one is
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* actually has pointer focus first. */
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if (focused_client == event->seat_client) {
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/* Once we've vetted the client, we can tell the cursor to use the
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* provided surface as the cursor image. It will set the hardware cursor
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* on the output that it's currently on and continue to do so as the
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* cursor moves between outputs. */
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wlr_cursor_set_surface(server->cursor, event->surface,
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event->hotspot_x, event->hotspot_y);
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}
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}
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static bool view_at(struct tinywl_view *view,
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double lx, double ly, struct wlr_surface **surface,
|
|
|
|
|
double *sx, double *sy) {
|
|
|
|
|
/*
|
|
|
|
|
* XDG toplevels may have nested surfaces, such as popup windows for context
|
|
|
|
|
* menus or tooltips. This function tests if any of those are underneath the
|
|
|
|
|
* coordinates lx and ly (in output Layout Coordinates). If so, it sets the
|
|
|
|
|
* surface pointer to that wlr_surface and the sx and sy coordinates to the
|
|
|
|
|
* coordinates relative to that surface's top-left corner.
|
|
|
|
|
*/
|
|
|
|
|
double view_sx = lx - view->x;
|
|
|
|
|
double view_sy = ly - view->y;
|
|
|
|
|
|
|
|
|
|
struct wlr_surface_state *state = &view->xdg_surface->surface->current;
|
|
|
|
|
|
|
|
|
|
double _sx, _sy;
|
|
|
|
|
struct wlr_surface *_surface = NULL;
|
|
|
|
|
_surface = wlr_xdg_surface_surface_at(
|
|
|
|
|
view->xdg_surface, view_sx, view_sy, &_sx, &_sy);
|
|
|
|
|
|
|
|
|
|
if (_surface != NULL) {
|
|
|
|
|
*sx = _sx;
|
|
|
|
|
*sy = _sy;
|
|
|
|
|
*surface = _surface;
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct tinywl_view *desktop_view_at(
|
|
|
|
|
struct tinywl_server *server, double lx, double ly,
|
|
|
|
|
struct wlr_surface **surface, double *sx, double *sy) {
|
|
|
|
|
/* This iterates over all of our surfaces and attempts to find one under the
|
|
|
|
|
* cursor. This relies on server->views being ordered from top-to-bottom. */
|
|
|
|
|
struct tinywl_view *view;
|
|
|
|
|
wl_list_for_each(view, &server->views, link) {
|
|
|
|
|
if (view_at(view, lx, ly, surface, sx, sy)) {
|
|
|
|
|
return view;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void process_cursor_move(struct tinywl_server *server, uint32_t time) {
|
|
|
|
|
/* Move the grabbed view to the new position. */
|
|
|
|
|
server->grabbed_view->x = server->cursor->x - server->grab_x;
|
|
|
|
|
server->grabbed_view->y = server->cursor->y - server->grab_y;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void process_cursor_resize(struct tinywl_server *server, uint32_t time) {
|
|
|
|
|
/*
|
|
|
|
|
* Resizing the grabbed view can be a little bit complicated, because we
|
|
|
|
|
* could be resizing from any corner or edge. This not only resizes the view
|
|
|
|
|
* on one or two axes, but can also move the view if you resize from the top
|
|
|
|
|
* or left edges (or top-left corner).
|
|
|
|
|
*
|
|
|
|
|
* Note that I took some shortcuts here. In a more fleshed-out compositor,
|
|
|
|
|
* you'd wait for the client to prepare a buffer at the new size, then
|
|
|
|
|
* commit any movement that was prepared.
|
|
|
|
|
*/
|
|
|
|
|
struct tinywl_view *view = server->grabbed_view;
|
|
|
|
|
double dx = server->cursor->x - server->grab_x;
|
|
|
|
|
double dy = server->cursor->y - server->grab_y;
|
|
|
|
|
double x = view->x;
|
|
|
|
|
double y = view->y;
|
|
|
|
|
int width = server->grab_width;
|
|
|
|
|
int height = server->grab_height;
|
|
|
|
|
if (server->resize_edges & WLR_EDGE_TOP) {
|
|
|
|
|
y = server->grab_y + dy;
|
|
|
|
|
height -= dy;
|
|
|
|
|
if (height < 1) {
|
|
|
|
|
y += height;
|
|
|
|
|
}
|
|
|
|
|
} else if (server->resize_edges & WLR_EDGE_BOTTOM) {
|
|
|
|
|
height += dy;
|
|
|
|
|
}
|
|
|
|
|
if (server->resize_edges & WLR_EDGE_LEFT) {
|
|
|
|
|
x = server->grab_x + dx;
|
|
|
|
|
width -= dx;
|
|
|
|
|
if (width < 1) {
|
|
|
|
|
x += width;
|
|
|
|
|
}
|
|
|
|
|
} else if (server->resize_edges & WLR_EDGE_RIGHT) {
|
|
|
|
|
width += dx;
|
|
|
|
|
}
|
|
|
|
|
view->x = x;
|
|
|
|
|
view->y = y;
|
|
|
|
|
wlr_xdg_toplevel_set_size(view->xdg_surface, width, height);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void process_cursor_motion(struct tinywl_server *server, uint32_t time) {
|
|
|
|
|
/* If the mode is non-passthrough, delegate to those functions. */
|
|
|
|
|
if (server->cursor_mode == TINYWL_CURSOR_MOVE) {
|
|
|
|
|
process_cursor_move(server, time);
|
|
|
|
|
return;
|
|
|
|
|
} else if (server->cursor_mode == TINYWL_CURSOR_RESIZE) {
|
|
|
|
|
process_cursor_resize(server, time);
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Otherwise, find the view under the pointer and send the event along. */
|
|
|
|
|
double sx, sy;
|
|
|
|
|
struct wlr_seat *seat = server->seat;
|
|
|
|
|
struct wlr_surface *surface = NULL;
|
|
|
|
|
struct tinywl_view *view = desktop_view_at(server,
|
|
|
|
|
server->cursor->x, server->cursor->y, &surface, &sx, &sy);
|
|
|
|
|
if (!view) {
|
|
|
|
|
/* If there's no view under the cursor, set the cursor image to a
|
|
|
|
|
* default. This is what makes the cursor image appear when you move it
|
|
|
|
|
* around the screen, not over any views. */
|
|
|
|
|
wlr_xcursor_manager_set_cursor_image(
|
|
|
|
|
server->cursor_mgr, "left_ptr", server->cursor);
|
|
|
|
|
}
|
|
|
|
|
if (surface) {
|
|
|
|
|
bool focus_changed = seat->pointer_state.focused_surface != surface;
|
|
|
|
|
/*
|
|
|
|
|
* "Enter" the surface if necessary. This lets the client know that the
|
|
|
|
|
* cursor has entered one of its surfaces.
|
|
|
|
|
*
|
|
|
|
|
* Note that this gives the surface "pointer focus", which is distinct
|
|
|
|
|
* from keyboard focus. You get pointer focus by moving the pointer over
|
|
|
|
|
* a window.
|
|
|
|
|
*/
|
|
|
|
|
wlr_seat_pointer_notify_enter(seat, surface, sx, sy);
|
|
|
|
|
if (!focus_changed) {
|
|
|
|
|
/* The enter event contains coordinates, so we only need to notify
|
|
|
|
|
* on motion if the focus did not change. */
|
|
|
|
|
wlr_seat_pointer_notify_motion(seat, time, sx, sy);
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
/* Clear pointer focus so future button events and such are not sent to
|
|
|
|
|
* the last client to have the cursor over it. */
|
|
|
|
|
wlr_seat_pointer_clear_focus(seat);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void server_cursor_motion(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is forwarded by the cursor when a pointer emits a _relative_
|
|
|
|
|
* pointer motion event (i.e. a delta) */
|
|
|
|
|
struct tinywl_server *server =
|
|
|
|
|
wl_container_of(listener, server, cursor_motion);
|
|
|
|
|
struct wlr_event_pointer_motion *event = data;
|
|
|
|
|
/* The cursor doesn't move unless we tell it to. The cursor automatically
|
|
|
|
|
* handles constraining the motion to the output layout, as well as any
|
|
|
|
|
* special configuration applied for the specific input device which
|
|
|
|
|
* generated the event. You can pass NULL for the device if you want to move
|
|
|
|
|
* the cursor around without any input. */
|
|
|
|
|
wlr_cursor_move(server->cursor, event->device,
|
|
|
|
|
event->delta_x, event->delta_y);
|
|
|
|
|
process_cursor_motion(server, event->time_msec);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void server_cursor_motion_absolute(
|
|
|
|
|
struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is forwarded by the cursor when a pointer emits an _absolute_
|
|
|
|
|
* motion event, from 0..1 on each axis. This happens, for example, when
|
|
|
|
|
* wlroots is running under a Wayland window rather than KMS+DRM, and you
|
|
|
|
|
* move the mouse over the window. You could enter the window from any edge,
|
|
|
|
|
* so we have to warp the mouse there. There is also some hardware which
|
|
|
|
|
* emits these events. */
|
|
|
|
|
struct tinywl_server *server =
|
|
|
|
|
wl_container_of(listener, server, cursor_motion_absolute);
|
|
|
|
|
struct wlr_event_pointer_motion_absolute *event = data;
|
|
|
|
|
wlr_cursor_warp_absolute(server->cursor, event->device, event->x, event->y);
|
|
|
|
|
process_cursor_motion(server, event->time_msec);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void server_cursor_button(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is forwarded by the cursor when a pointer emits a button
|
|
|
|
|
* event. */
|
|
|
|
|
struct tinywl_server *server =
|
|
|
|
|
wl_container_of(listener, server, cursor_button);
|
|
|
|
|
struct wlr_event_pointer_button *event = data;
|
|
|
|
|
/* Notify the client with pointer focus that a button press has occured */
|
|
|
|
|
wlr_seat_pointer_notify_button(server->seat,
|
|
|
|
|
event->time_msec, event->button, event->state);
|
|
|
|
|
double sx, sy;
|
|
|
|
|
struct wlr_seat *seat = server->seat;
|
|
|
|
|
struct wlr_surface *surface;
|
|
|
|
|
struct tinywl_view *view = desktop_view_at(server,
|
|
|
|
|
server->cursor->x, server->cursor->y, &surface, &sx, &sy);
|
|
|
|
|
if (event->state == WLR_BUTTON_RELEASED) {
|
|
|
|
|
/* If you released any buttons, we exit interactive move/resize mode. */
|
|
|
|
|
server->cursor_mode = TINYWL_CURSOR_PASSTHROUGH;
|
|
|
|
|
} else {
|
|
|
|
|
/* Focus that client if the button was _pressed_ */
|
|
|
|
|
focus_view(view, surface);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void server_cursor_axis(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is forwarded by the cursor when a pointer emits an axis event,
|
|
|
|
|
* for example when you move the scroll wheel. */
|
|
|
|
|
struct tinywl_server *server =
|
|
|
|
|
wl_container_of(listener, server, cursor_axis);
|
|
|
|
|
struct wlr_event_pointer_axis *event = data;
|
|
|
|
|
/* Notify the client with pointer focus of the axis event. */
|
|
|
|
|
wlr_seat_pointer_notify_axis(server->seat,
|
|
|
|
|
event->time_msec, event->orientation, event->delta,
|
|
|
|
|
event->delta_discrete, event->source);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Used to move all of the data necessary to render a surface from the top-level
|
|
|
|
|
* frame handler to the per-surface render function. */
|
|
|
|
|
struct render_data {
|
|
|
|
|
struct wlr_output *output;
|
|
|
|
|
struct wlr_renderer *renderer;
|
|
|
|
|
struct tinywl_view *view;
|
|
|
|
|
struct timespec *when;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static void render_surface(struct wlr_surface *surface,
|
|
|
|
|
int sx, int sy, void *data) {
|
|
|
|
|
/* This function is called for every surface that needs to be rendered. */
|
|
|
|
|
struct render_data *rdata = data;
|
|
|
|
|
struct tinywl_view *view = rdata->view;
|
|
|
|
|
struct wlr_output *output = rdata->output;
|
|
|
|
|
|
|
|
|
|
/* We first obtain a wlr_texture, which is a GPU resource. wlroots
|
|
|
|
|
* automatically handles negotiating these with the client. The underlying
|
|
|
|
|
* resource could be an opaque handle passed from the client, or the client
|
|
|
|
|
* could have sent a pixel buffer which we copied to the GPU, or a few other
|
|
|
|
|
* means. You don't have to worry about this, wlroots takes care of it. */
|
|
|
|
|
struct wlr_texture *texture = wlr_surface_get_texture(surface);
|
|
|
|
|
if (texture == NULL) {
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* The view has a position in layout coordinates. If you have two displays,
|
|
|
|
|
* one next to the other, both 1080p, a view on the rightmost display might
|
|
|
|
|
* have layout coordinates of 2000,100. We need to translate that to
|
|
|
|
|
* output-local coordinates, or (2000 - 1920). */
|
|
|
|
|
double ox = 0, oy = 0;
|
|
|
|
|
wlr_output_layout_output_coords(
|
|
|
|
|
view->server->output_layout, output, &ox, &oy);
|
|
|
|
|
ox += view->x + sx, oy += view->y + sy;
|
|
|
|
|
|
|
|
|
|
/* We also have to apply the scale factor for HiDPI outputs. This is only
|
|
|
|
|
* part of the puzzle, TinyWL does not fully support HiDPI. */
|
|
|
|
|
struct wlr_box box = {
|
|
|
|
|
.x = ox * output->scale,
|
|
|
|
|
.y = oy * output->scale,
|
|
|
|
|
.width = surface->current.width * output->scale,
|
|
|
|
|
.height = surface->current.height * output->scale,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Those familiar with OpenGL are also familiar with the role of matricies
|
|
|
|
|
* in graphics programming. We need to prepare a matrix to render the view
|
|
|
|
|
* with. wlr_matrix_project_box is a helper which takes a box with a desired
|
|
|
|
|
* x, y coodrinates, width and height, and an output geometry, then
|
|
|
|
|
* prepares an orthographic projection and multiplies the necessary
|
|
|
|
|
* transforms to produce a model-view-projection matrix.
|
|
|
|
|
*
|
|
|
|
|
* Naturally you can do this any way you like, for example to make a 3D
|
|
|
|
|
* compositor.
|
|
|
|
|
*/
|
|
|
|
|
float matrix[9];
|
|
|
|
|
enum wl_output_transform transform =
|
|
|
|
|
wlr_output_transform_invert(surface->current.transform);
|
|
|
|
|
wlr_matrix_project_box(matrix, &box, transform, 0,
|
|
|
|
|
output->transform_matrix);
|
|
|
|
|
|
|
|
|
|
/* This takes our matrix, the texture, and an alpha, and performs the actual
|
|
|
|
|
* rendering on the GPU. */
|
|
|
|
|
wlr_render_texture_with_matrix(rdata->renderer, texture, matrix, 1);
|
|
|
|
|
|
|
|
|
|
/* This lets the client know that we've displayed that frame and it can
|
|
|
|
|
* prepare another one now if it likes. */
|
|
|
|
|
wlr_surface_send_frame_done(surface, rdata->when);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void output_frame(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This function is called every time an output is ready to display a frame,
|
|
|
|
|
* generally at the output's refresh rate (e.g. 60Hz). */
|
|
|
|
|
struct tinywl_output *output =
|
|
|
|
|
wl_container_of(listener, output, frame);
|
|
|
|
|
struct wlr_renderer *renderer = output->server->renderer;
|
|
|
|
|
|
|
|
|
|
struct timespec now;
|
|
|
|
|
clock_gettime(CLOCK_MONOTONIC, &now);
|
|
|
|
|
|
|
|
|
|
/* wlr_output_make_current makes the OpenGL context current. */
|
|
|
|
|
if (!wlr_output_make_current(output->wlr_output, NULL)) {
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
/* The "effective" resolution can change if you rotate your outputs. */
|
|
|
|
|
int width, height;
|
|
|
|
|
wlr_output_effective_resolution(output->wlr_output, &width, &height);
|
|
|
|
|
/* Begin the renderer (calls glViewport and some other GL sanity checks) */
|
|
|
|
|
wlr_renderer_begin(renderer, width, height);
|
|
|
|
|
|
|
|
|
|
float color[4] = {0.3, 0.3, 0.3, 1.0};
|
|
|
|
|
wlr_renderer_clear(renderer, color);
|
|
|
|
|
|
|
|
|
|
/* Each subsequent window we render is rendered on top of the last. Because
|
|
|
|
|
* our view list is ordered front-to-back, we iterate over it backwards. */
|
|
|
|
|
struct tinywl_view *view;
|
|
|
|
|
wl_list_for_each_reverse(view, &output->server->views, link) {
|
|
|
|
|
if (!view->mapped) {
|
|
|
|
|
/* An unmapped view should not be rendered. */
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
struct render_data rdata = {
|
|
|
|
|
.output = output->wlr_output,
|
|
|
|
|
.view = view,
|
|
|
|
|
.renderer = renderer,
|
|
|
|
|
.when = &now,
|
|
|
|
|
};
|
|
|
|
|
/* This calls our render_surface function for each surface among the
|
|
|
|
|
* xdg_surface's toplevel and popups. */
|
|
|
|
|
wlr_xdg_surface_for_each_surface(view->xdg_surface,
|
|
|
|
|
render_surface, &rdata);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Conclude rendering and swap the buffers, showing the final frame
|
|
|
|
|
* on-screen. */
|
|
|
|
|
wlr_renderer_end(renderer);
|
|
|
|
|
wlr_output_swap_buffers(output->wlr_output, NULL, NULL);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void server_new_output(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is rasied by the backend when a new output (aka a display or
|
|
|
|
|
* monitor) becomes available. */
|
|
|
|
|
struct tinywl_server *server =
|
|
|
|
|
wl_container_of(listener, server, new_output);
|
|
|
|
|
struct wlr_output *wlr_output = data;
|
|
|
|
|
|
|
|
|
|
/* Some backends don't have modes. DRM+KMS does, and we need to set a mode
|
|
|
|
|
* before we can use the output. The mode is a tuple of (width, height,
|
|
|
|
|
* refresh rate), and each monitor supports only a specific set of modes. We
|
|
|
|
|
* just pick the first, a more sophisticated compositor would let the user
|
|
|
|
|
* configure it or pick the mode the display advertises as preferred. */
|
|
|
|
|
if (!wl_list_empty(&wlr_output->modes)) {
|
|
|
|
|
struct wlr_output_mode *mode =
|
|
|
|
|
wl_container_of(wlr_output->modes.prev, mode, link);
|
|
|
|
|
wlr_output_set_mode(wlr_output, mode);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Allocates and configures our state for this output */
|
|
|
|
|
struct tinywl_output *output =
|
|
|
|
|
calloc(1, sizeof(struct tinywl_output));
|
|
|
|
|
output->wlr_output = wlr_output;
|
|
|
|
|
output->server = server;
|
|
|
|
|
/* Sets up a listener for the frame notify event. */
|
|
|
|
|
output->frame.notify = output_frame;
|
|
|
|
|
wl_signal_add(&wlr_output->events.frame, &output->frame);
|
|
|
|
|
wl_list_insert(&server->outputs, &output->link);
|
|
|
|
|
|
|
|
|
|
/* Adds this to the output layout. The add_auto function arranges outputs
|
|
|
|
|
* from left-to-right in the order they appear. A more sophisticated
|
|
|
|
|
* compositor would let the user configure the arrangement of outputs in the
|
|
|
|
|
* layout. */
|
|
|
|
|
wlr_output_layout_add_auto(server->output_layout, wlr_output);
|
|
|
|
|
|
|
|
|
|
/* Creating the global adds a wl_output global to the display, which Wayland
|
|
|
|
|
* clients can see to find out information about the output (such as
|
|
|
|
|
* DPI, scale factor, manufacturer, etc). */
|
|
|
|
|
wlr_output_create_global(wlr_output);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void xdg_surface_map(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* Called when the surface is mapped, or ready to display on-screen. */
|
|
|
|
|
struct tinywl_view *view = wl_container_of(listener, view, map);
|
|
|
|
|
view->mapped = true;
|
|
|
|
|
focus_view(view, view->xdg_surface->surface);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void xdg_surface_unmap(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* Called when the surface is unmapped, and should no longer be shown. */
|
|
|
|
|
struct tinywl_view *view = wl_container_of(listener, view, unmap);
|
|
|
|
|
view->mapped = false;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void xdg_surface_destroy(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* Called when the surface is destroyed and should never be shown again. */
|
|
|
|
|
struct tinywl_view *view = wl_container_of(listener, view, destroy);
|
|
|
|
|
wl_list_remove(&view->link);
|
|
|
|
|
free(view);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void begin_interactive(struct tinywl_view *view,
|
|
|
|
|
enum tinywl_cursor_mode mode, uint32_t edges) {
|
|
|
|
|
/* This function sets up an interactive move or resize operation, where the
|
|
|
|
|
* compositor stops propegating pointer events to clients and instead
|
|
|
|
|
* consumes them itself, to move or resize windows. */
|
|
|
|
|
struct tinywl_server *server = view->server;
|
|
|
|
|
struct wlr_surface *focused_surface =
|
|
|
|
|
server->seat->pointer_state.focused_surface;
|
|
|
|
|
if (view->xdg_surface->surface != focused_surface) {
|
|
|
|
|
/* Deny move/resize requests from unfocused clients. */
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
server->grabbed_view = view;
|
|
|
|
|
server->cursor_mode = mode;
|
|
|
|
|
struct wlr_box geo_box;
|
|
|
|
|
wlr_xdg_surface_get_geometry(view->xdg_surface, &geo_box);
|
|
|
|
|
if (mode == TINYWL_CURSOR_MOVE) {
|
|
|
|
|
server->grab_x = server->cursor->x - view->x;
|
|
|
|
|
server->grab_y = server->cursor->y - view->y;
|
|
|
|
|
} else {
|
|
|
|
|
server->grab_x = server->cursor->x + geo_box.x;
|
|
|
|
|
server->grab_y = server->cursor->y + geo_box.y;
|
|
|
|
|
}
|
|
|
|
|
server->grab_width = geo_box.width;
|
|
|
|
|
server->grab_height = geo_box.height;
|
|
|
|
|
server->resize_edges = edges;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void xdg_toplevel_request_move(
|
|
|
|
|
struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is raised when a client would like to begin an interactive
|
|
|
|
|
* move, typically because the user clicked on their client-side
|
|
|
|
|
* decorations. Note that a more sophisticated compositor should check the
|
|
|
|
|
* provied serial against a list of button press serials sent to this
|
|
|
|
|
* client, to prevent the client from requesting this whenver they want. */
|
|
|
|
|
struct tinywl_view *view = wl_container_of(listener, view, request_move);
|
|
|
|
|
begin_interactive(view, TINYWL_CURSOR_MOVE, 0);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void xdg_toplevel_request_resize(
|
|
|
|
|
struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is raised when a client would like to begin an interactive
|
|
|
|
|
* resize, typically because the user clicked on their client-side
|
|
|
|
|
* decorations. Note that a more sophisticated compositor should check the
|
|
|
|
|
* provied serial against a list of button press serials sent to this
|
|
|
|
|
* client, to prevent the client from requesting this whenver they want. */
|
|
|
|
|
struct wlr_xdg_toplevel_resize_event *event = data;
|
|
|
|
|
struct tinywl_view *view = wl_container_of(listener, view, request_resize);
|
|
|
|
|
begin_interactive(view, TINYWL_CURSOR_RESIZE, event->edges);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void server_new_xdg_surface(struct wl_listener *listener, void *data) {
|
|
|
|
|
/* This event is raised when wlr_xdg_shell receives a new xdg surface from a
|
|
|
|
|
* client, either a toplevel (application window) or popup. */
|
|
|
|
|
struct tinywl_server *server =
|
|
|
|
|
wl_container_of(listener, server, new_xdg_surface);
|
|
|
|
|
struct wlr_xdg_surface *xdg_surface = data;
|
|
|
|
|
if (xdg_surface->role != WLR_XDG_SURFACE_ROLE_TOPLEVEL) {
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Allocate a tinywl_view for this surface */
|
|
|
|
|
struct tinywl_view *view =
|
|
|
|
|
calloc(1, sizeof(struct tinywl_view));
|
|
|
|
|
view->server = server;
|
|
|
|
|
view->xdg_surface = xdg_surface;
|
|
|
|
|
|
|
|
|
|
/* Listen to the various events it can emit */
|
|
|
|
|
view->map.notify = xdg_surface_map;
|
|
|
|
|
wl_signal_add(&xdg_surface->events.map, &view->map);
|
|
|
|
|
view->unmap.notify = xdg_surface_unmap;
|
|
|
|
|
wl_signal_add(&xdg_surface->events.unmap, &view->unmap);
|
|
|
|
|
view->destroy.notify = xdg_surface_destroy;
|
|
|
|
|
wl_signal_add(&xdg_surface->events.destroy, &view->destroy);
|
|
|
|
|
|
|
|
|
|
/* cotd */
|
|
|
|
|
struct wlr_xdg_toplevel *toplevel = xdg_surface->toplevel;
|
|
|
|
|
view->request_move.notify = xdg_toplevel_request_move;
|
|
|
|
|
wl_signal_add(&toplevel->events.request_move, &view->request_move);
|
|
|
|
|
view->request_resize.notify = xdg_toplevel_request_resize;
|
|
|
|
|
wl_signal_add(&toplevel->events.request_resize, &view->request_resize);
|
|
|
|
|
|
|
|
|
|
/* Add it to the list of views. */
|
|
|
|
|
wl_list_insert(&server->views, &view->link);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int main(int argc, char *argv[]) {
|
|
|
|
|
wlr_log_init(WLR_DEBUG, NULL);
|
|
|
|
|
char *startup_cmd = NULL;
|
|
|
|
|
|
|
|
|
|
int c;
|
|
|
|
|
while ((c = getopt(argc, argv, "s:h")) != -1) {
|
|
|
|
|
switch (c) {
|
|
|
|
|
case 's':
|
|
|
|
|
startup_cmd = optarg;
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
printf("Usage: %s [-s startup command]\n", argv[0]);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if (optind < argc) {
|
|
|
|
|
printf("Usage: %s [-s startup command]\n", argv[0]);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
struct tinywl_server server;
|
|
|
|
|
/* The Wayland display is managed by libwayland. It handles accepting
|
|
|
|
|
* clients from the Unix socket, manging Wayland globals, and so on. */
|
|
|
|
|
server.wl_display = wl_display_create();
|
|
|
|
|
/* The backend is a wlroots feature which abstracts the underlying input and
|
|
|
|
|
* output hardware. The autocreate option will choose the most suitable
|
|
|
|
|
* backend based on the current environment, such as opening an X11 window
|
|
|
|
|
* if an X11 server is running. The NULL argument here optionally allows you
|
|
|
|
|
* to pass in a custom renderer if wlr_renderer doesn't meet your needs. The
|
|
|
|
|
* backend uses the renderer, for example, to fall back to software cursors
|
|
|
|
|
* if the backend does not support hardware cursors (some older GPUs
|
|
|
|
|
* don't). */
|
|
|
|
|
server.backend = wlr_backend_autocreate(server.wl_display, NULL);
|
|
|
|
|
|
|
|
|
|
/* If we don't provide a renderer, autocreate makes a GLES2 renderer for us.
|
|
|
|
|
* The renderer is responsible for defining the various pixel formats it
|
|
|
|
|
* supports for shared memory, this configures that for clients. */
|
|
|
|
|
server.renderer = wlr_backend_get_renderer(server.backend);
|
|
|
|
|
wlr_renderer_init_wl_display(server.renderer, server.wl_display);
|
|
|
|
|
|
|
|
|
|
/* This creates some hands-off wlroots interfaces. The compositor is
|
|
|
|
|
* necessary for clients to allocate surfaces, dmabuf allows them to use
|
|
|
|
|
* opaque GPU handles for buffers to avoid copying pixels on the CPU, and
|
|
|
|
|
* the data device manager handles the clipboard. Each of these wlroots
|
|
|
|
|
* interfaces has room for you to dig your fingers in and play with their
|
|
|
|
|
* behavior if you want. */
|
|
|
|
|
wlr_compositor_create(server.wl_display, server.renderer);
|
|
|
|
|
wlr_linux_dmabuf_v1_create(server.wl_display, server.renderer);
|
|
|
|
|
wlr_data_device_manager_create(server.wl_display);
|
|
|
|
|
|
|
|
|
|
/* Creates an output layout, which a wlroots utility for working with an
|
|
|
|
|
* arrangement of screens in a physical layout. */
|
|
|
|
|
server.output_layout = wlr_output_layout_create();
|
|
|
|
|
|
|
|
|
|
/* Configure a listener to be notified when new outputs are available on the
|
|
|
|
|
* backend. */
|
|
|
|
|
wl_list_init(&server.outputs);
|
|
|
|
|
server.new_output.notify = server_new_output;
|
|
|
|
|
wl_signal_add(&server.backend->events.new_output, &server.new_output);
|
|
|
|
|
|
|
|
|
|
/* Set up our list of views and the xdg-shell. The xdg-shell is a Wayland
|
|
|
|
|
* protocol which is used for application windows. For more detail on
|
|
|
|
|
* shells, refer to my article:
|
|
|
|
|
*
|
|
|
|
|
* https://drewdevault.com/2018/07/29/Wayland-shells.html
|
|
|
|
|
*/
|
|
|
|
|
wl_list_init(&server.views);
|
|
|
|
|
server.xdg_shell = wlr_xdg_shell_create(server.wl_display);
|
|
|
|
|
server.new_xdg_surface.notify = server_new_xdg_surface;
|
|
|
|
|
wl_signal_add(&server.xdg_shell->events.new_surface,
|
|
|
|
|
&server.new_xdg_surface);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Creates a cursor, which is a wlroots utility for tracking the cursor
|
|
|
|
|
* image shown on screen.
|
|
|
|
|
*/
|
|
|
|
|
server.cursor = wlr_cursor_create();
|
|
|
|
|
wlr_cursor_attach_output_layout(server.cursor, server.output_layout);
|
|
|
|
|
|
|
|
|
|
/* Creates an xcursor manager, another wlroots utility which loads up
|
|
|
|
|
* Xcursor themes to source cursor images from and makes sure that cursor
|
|
|
|
|
* images are available at all scale factors on the screen (necessary for
|
|
|
|
|
* HiDPI support). We add a cursor theme at scale factor 1 to begin with. */
|
|
|
|
|
server.cursor_mgr = wlr_xcursor_manager_create(NULL, 24);
|
|
|
|
|
wlr_xcursor_manager_load(server.cursor_mgr, 1);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* wlr_cursor *only* displays an image on screen. It does not move around
|
|
|
|
|
* when the pointer moves. However, we can attach input devices to it, and
|
|
|
|
|
* it will generate aggregate events for all of them. In these events, we
|
|
|
|
|
* can choose how we want to process them, forwarding them to clients and
|
|
|
|
|
* moving the cursor around. More detail on this process is described in my
|
|
|
|
|
* input handling blog post:
|
|
|
|
|
*
|
|
|
|
|
* https://drewdevault.com/2018/07/17/Input-handling-in-wlroots.html
|
|
|
|
|
*
|
|
|
|
|
* And more comments are sprinkled throughout the notify functions above.
|
|
|
|
|
*/
|
|
|
|
|
server.cursor_motion.notify = server_cursor_motion;
|
|
|
|
|
wl_signal_add(&server.cursor->events.motion, &server.cursor_motion);
|
|
|
|
|
server.cursor_motion_absolute.notify = server_cursor_motion_absolute;
|
|
|
|
|
wl_signal_add(&server.cursor->events.motion_absolute,
|
|
|
|
|
&server.cursor_motion_absolute);
|
|
|
|
|
server.cursor_button.notify = server_cursor_button;
|
|
|
|
|
wl_signal_add(&server.cursor->events.button, &server.cursor_button);
|
|
|
|
|
server.cursor_axis.notify = server_cursor_axis;
|
|
|
|
|
wl_signal_add(&server.cursor->events.axis, &server.cursor_axis);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Configures a seat, which is a single "seat" at which a user sits and
|
|
|
|
|
* operates the computer. This conceptually includes up to one keyboard,
|
|
|
|
|
* pointer, touch, and drawing tablet device. We also rig up a listener to
|
|
|
|
|
* let us know when new input devices are available on the backend.
|
|
|
|
|
*/
|
|
|
|
|
wl_list_init(&server.keyboards);
|
|
|
|
|
server.new_input.notify = server_new_input;
|
|
|
|
|
wl_signal_add(&server.backend->events.new_input, &server.new_input);
|
|
|
|
|
server.seat = wlr_seat_create(server.wl_display, "seat0");
|
|
|
|
|
server.request_cursor.notify = seat_request_cursor;
|
|
|
|
|
wl_signal_add(&server.seat->events.request_set_cursor,
|
|
|
|
|
&server.request_cursor);
|
|
|
|
|
|
|
|
|
|
/* Add a Unix socket to the Wayland display. */
|
|
|
|
|
const char *socket = wl_display_add_socket_auto(server.wl_display);
|
|
|
|
|
if (!socket) {
|
|
|
|
|
wlr_backend_destroy(server.backend);
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Start the backend. This will enumerate outputs and inputs, become the DRM
|
|
|
|
|
* master, etc */
|
|
|
|
|
if (!wlr_backend_start(server.backend)) {
|
|
|
|
|
wlr_backend_destroy(server.backend);
|
|
|
|
|
wl_display_destroy(server.wl_display);
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Set the WAYLAND_DISPLAY environment variable to our socket and run the
|
|
|
|
|
* startup command if requested. */
|
|
|
|
|
setenv("WAYLAND_DISPLAY", socket, true);
|
|
|
|
|
if (startup_cmd) {
|
|
|
|
|
if (fork() == 0) {
|
|
|
|
|
execl("/bin/sh", "/bin/sh", "-c", startup_cmd, (void *)NULL);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
/* Run the Wayland event loop. This does not return until you exit the
|
|
|
|
|
* compositor. Starting the backend rigged up all of the necessary event
|
|
|
|
|
* loop configuration to listen to libinput events, DRM events, generate
|
|
|
|
|
* frame events at the refresh rate, and so on. */
|
|
|
|
|
wlr_log(WLR_INFO, "Running Wayland compositor on WAYLAND_DISPLAY=%s",
|
|
|
|
|
socket);
|
|
|
|
|
wl_display_run(server.wl_display);
|
|
|
|
|
|
|
|
|
|
/* Once wl_display_run returns, we shut down the server. */
|
|
|
|
|
wl_display_destroy_clients(server.wl_display);
|
|
|
|
|
wl_display_destroy(server.wl_display);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
Drew DeVault
GitHub