/* * See LICENSE file for copyright and license details. */ #define _POSIX_C_SOURCE 200112L #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* macros */ #define MIN(A, B) ((A) < (B) ? (A) : (B)) #define CLEANMASK(mask) (mask & ~WLR_MODIFIER_CAPS) #define VISIBLEON(C, M) ((C)->mon == (M)) #define LENGTH(X) (sizeof X / sizeof X[0]) /* enums */ enum { CurNormal, CurMove, CurResize }; /* cursor */ typedef union { int i; unsigned int ui; float f; const void *v; } Arg; typedef struct { unsigned int mod; unsigned int button; void (*func)(const Arg *); const Arg arg; } Button; typedef struct Monitor Monitor; typedef struct { struct wl_list link; struct wl_list flink; struct wlr_xdg_surface *xdg_surface; struct wl_listener map; struct wl_listener unmap; struct wl_listener destroy; struct wl_listener request_move; struct wl_listener request_resize; Monitor *mon; int x, y; /* layout-relative */ } Client; typedef struct { uint32_t mod; xkb_keysym_t keysym; void (*func)(const Arg *); const Arg arg; } Key; typedef struct { struct wl_list link; struct wlr_input_device *device; struct wl_listener modifiers; struct wl_listener key; } Keyboard; typedef struct { const char *symbol; void (*arrange)(Monitor *); } Layout; struct Monitor { struct wl_list link; struct wlr_output *wlr_output; struct wl_listener frame; struct wlr_box *geom; /* layout-relative */ int wx, wy, ww, wh; /* layout-relative */ const Layout *lt[2]; unsigned int sellt; double mfact; int nmaster; }; typedef struct { const char *name; float mfact; int nmaster; float scale; const Layout *lt; } MonitorRule; /* 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 timespec *when; int x, y; /* layout-relative */ }; /* function declarations */ static void arrange(Monitor *m); static void axisnotify(struct wl_listener *listener, void *data); static void buttonpress(struct wl_listener *listener, void *data); static void createkeyboard(struct wlr_input_device *device); static void createmon(struct wl_listener *listener, void *data); static void createnotify(struct wl_listener *listener, void *data); static void createpointer(struct wlr_input_device *device); static void cursorframe(struct wl_listener *listener, void *data); static void destroynotify(struct wl_listener *listener, void *data); static void focus(Client *c, struct wlr_surface *surface); static void focusnext(const Arg *arg); static void inputdevice(struct wl_listener *listener, void *data); static bool keybinding(uint32_t mods, xkb_keysym_t sym); static void keypress(struct wl_listener *listener, void *data); static void keypressmod(struct wl_listener *listener, void *data); static void maprequest(struct wl_listener *listener, void *data); static void motionabsolute(struct wl_listener *listener, void *data); static void motionnotify(uint32_t time); static void motionrelative(struct wl_listener *listener, void *data); static void movemouse(const Arg *arg); static void quit(const Arg *arg); static void render(struct wlr_surface *surface, int sx, int sy, void *data); static void rendermon(struct wl_listener *listener, void *data); static void resize(Client *c, int x, int y, int w, int h); static void resizemouse(const Arg *arg); static void run(char *startup_cmd); static Client *selclient(void); static void setcursor(struct wl_listener *listener, void *data); static void setlayout(const Arg *arg); static void setup(void); static void spawn(const Arg *arg); static void tile(Monitor *m); static void unmapnotify(struct wl_listener *listener, void *data); static Client *xytoclient(double x, double y, struct wlr_surface **surface, double *sx, double *sy); static Monitor *xytomon(double x, double y); /* variables */ static struct wl_display *wl_display; static struct wlr_backend *backend; static struct wlr_renderer *renderer; static struct wlr_xdg_shell *xdg_shell; static struct wl_listener new_xdg_surface; static struct wl_list clients; /* tiling order */ static struct wl_list fstack; /* focus order */ static struct wlr_cursor *cursor; static struct wlr_xcursor_manager *cursor_mgr; static struct wl_listener cursor_motion; static struct wl_listener cursor_motion_absolute; static struct wl_listener cursor_button; static struct wl_listener cursor_axis; static struct wl_listener cursor_frame; static struct wlr_seat *seat; static struct wl_listener new_input; static struct wl_listener request_cursor; static struct wl_list keyboards; static unsigned int cursor_mode; static Client *grabc; static double grabsx, grabsy; static struct wlr_output_layout *output_layout; static struct wl_list mons; static struct wl_listener new_output; static Monitor *selmon; #include "config.h" void arrange(Monitor *m) { if (m->lt[m->sellt]->arrange) m->lt[m->sellt]->arrange(m); } void axisnotify(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 wlr_event_pointer_axis *event = data; /* Notify the client with pointer focus of the axis event. */ wlr_seat_pointer_notify_axis(seat, event->time_msec, event->orientation, event->delta, event->delta_discrete, event->source); } void buttonpress(struct wl_listener *listener, void *data) { /* This event is forwarded by the cursor when a pointer emits a button * event. */ struct wlr_event_pointer_button *event = data; /* Notify the client with pointer focus that a button press has occurred */ wlr_seat_pointer_notify_button(seat, event->time_msec, event->button, event->state); double sx, sy; struct wlr_surface *surface; Client *c = xytoclient(cursor->x, cursor->y, &surface, &sx, &sy); if (event->state == WLR_BUTTON_RELEASED) { /* If you released any buttons, we exit interactive move/resize mode. */ cursor_mode = CurNormal; } else { /* Focus that client if the button was _pressed_ */ focus(c, surface); struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat); uint32_t mods = wlr_keyboard_get_modifiers(keyboard); for (int i = 0; i < LENGTH(buttons); i++) { if (event->button == buttons[i].button && CLEANMASK(mods) == CLEANMASK(buttons[i].mod) && buttons[i].func) { buttons[i].func(&buttons[i].arg); } } } } void createkeyboard(struct wlr_input_device *device) { Keyboard *keyboard = calloc(1, sizeof(*keyboard)); keyboard->device = device; /* Prepare an XKB keymap and assign it to the keyboard. */ struct xkb_context *context = xkb_context_new(XKB_CONTEXT_NO_FLAGS); struct xkb_keymap *keymap = xkb_map_new_from_names(context, &xkb_rules, XKB_KEYMAP_COMPILE_NO_FLAGS); wlr_keyboard_set_keymap(device->keyboard, keymap); xkb_keymap_unref(keymap); xkb_context_unref(context); wlr_keyboard_set_repeat_info(device->keyboard, 25, 600); /* Here we set up listeners for keyboard events. */ keyboard->modifiers.notify = keypressmod; wl_signal_add(&device->keyboard->events.modifiers, &keyboard->modifiers); keyboard->key.notify = keypress; wl_signal_add(&device->keyboard->events.key, &keyboard->key); wlr_seat_set_keyboard(seat, device); /* And add the keyboard to our list of keyboards */ wl_list_insert(&keyboards, &keyboard->link); } void createmon(struct wl_listener *listener, void *data) { /* This event is raised by the backend when a new output (aka a display or * monitor) becomes available. */ 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 monitor's preferred mode, a more sophisticated compositor * would let the user configure it. */ if (!wl_list_empty(&wlr_output->modes)) { struct wlr_output_mode *mode = wlr_output_preferred_mode(wlr_output); wlr_output_set_mode(wlr_output, mode); wlr_output_enable(wlr_output, true); if (!wlr_output_commit(wlr_output)) { return; } } /* Allocates and configures monitor state using configured rules */ Monitor *m = calloc(1, sizeof(*m)); m->wlr_output = wlr_output; int i; for (i = 0; i < LENGTH(monrules); i++) { if (!monrules[i].name || !strcmp(wlr_output->name, monrules[i].name)) { m->mfact = monrules[i].mfact; m->nmaster = monrules[i].nmaster; wlr_output_set_scale(wlr_output, monrules[i].scale); m->lt[0] = m->lt[1] = monrules[i].lt; break; } } /* Sets up a listener for the frame notify event. */ m->frame.notify = rendermon; wl_signal_add(&wlr_output->events.frame, &m->frame); wl_list_insert(&mons, &m->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. * * The output layout utility automatically 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_layout_add_auto(output_layout, wlr_output); } void createnotify(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 wlr_xdg_surface *xdg_surface = data; if (xdg_surface->role != WLR_XDG_SURFACE_ROLE_TOPLEVEL) { return; } /* Allocate a Client for this surface */ Client *c = calloc(1, sizeof(*c)); c->xdg_surface = xdg_surface; /* Tell the client not to try anything fancy */ wlr_xdg_toplevel_set_tiled(c->xdg_surface, true); /* Listen to the various events it can emit */ c->map.notify = maprequest; wl_signal_add(&xdg_surface->events.map, &c->map); c->unmap.notify = unmapnotify; wl_signal_add(&xdg_surface->events.unmap, &c->unmap); c->destroy.notify = destroynotify; wl_signal_add(&xdg_surface->events.destroy, &c->destroy); } void createpointer(struct wlr_input_device *device) { /* We don't do anything special with pointers. All of our pointer handling * is proxied through wlr_cursor. On another compositor, you might take this * opportunity to do libinput configuration on the device to set * acceleration, etc. */ wlr_cursor_attach_input_device(cursor, device); } void cursorframe(struct wl_listener *listener, void *data) { /* This event is forwarded by the cursor when a pointer emits an frame * event. Frame events are sent after regular pointer events to group * multiple events together. For instance, two axis events may happen at the * same time, in which case a frame event won't be sent in between. */ /* Notify the client with pointer focus of the frame event. */ wlr_seat_pointer_notify_frame(seat); } void destroynotify(struct wl_listener *listener, void *data) { /* Called when the surface is destroyed and should never be shown again. */ Client *c = wl_container_of(listener, c, destroy); free(c); } void focus(Client *c, struct wlr_surface *surface) { /* Note: this function only deals with keyboard focus. */ if (c == NULL) { return; } struct wlr_surface *prev_surface = seat->keyboard_state.focused_surface; if (prev_surface == surface) { /* Don't re-focus an already focused surface. */ return; } if (prev_surface) { /* * Deactivate the previously focused surface. This lets the * client know it no longer has focus and the client will * repaint accordingly, e.g. stop displaying a caret. */ struct wlr_xdg_surface *previous = wlr_xdg_surface_from_wlr_surface( seat->keyboard_state.focused_surface); wlr_xdg_toplevel_set_activated(previous, false); } struct wlr_keyboard *keyboard = wlr_seat_get_keyboard(seat); /* Move the client to the front of the focus stack */ wl_list_remove(&c->flink); wl_list_insert(&fstack, &c->flink); /* Activate the new surface */ wlr_xdg_toplevel_set_activated(c->xdg_surface, true); /* * Tell the seat to have the keyboard enter this surface. wlroots will keep * track of this and automatically send key events to the appropriate * clients without additional work on your part. */ wlr_seat_keyboard_notify_enter(seat, c->xdg_surface->surface, keyboard->keycodes, keyboard->num_keycodes, &keyboard->modifiers); } void focusnext(const Arg *arg) { Client *sel = selclient(); if (!sel) return; /* Find the selected client (top of fstack) and focus the client * following it in tiling order */ Client *c = wl_container_of(sel->link.next, c, link); /* Skip the sentinel node if we wrap around the end of the list */ if (&c->link == &clients) c = wl_container_of(c->link.next, c, link); focus(c, c->xdg_surface->surface); } void inputdevice(struct wl_listener *listener, void *data) { /* This event is raised by the backend when a new input device becomes * available. */ struct wlr_input_device *device = data; switch (device->type) { case WLR_INPUT_DEVICE_KEYBOARD: createkeyboard(device); break; case WLR_INPUT_DEVICE_POINTER: createpointer(device); break; default: break; } /* We need to let the wlr_seat know what our capabilities are, which is * communiciated to the client. In dwl we always have a cursor, even if * there are no pointer devices, so we always include that capability. */ uint32_t caps = WL_SEAT_CAPABILITY_POINTER; if (!wl_list_empty(&keyboards)) { caps |= WL_SEAT_CAPABILITY_KEYBOARD; } wlr_seat_set_capabilities(seat, caps); } bool keybinding(uint32_t mods, xkb_keysym_t sym) { /* * Here we handle compositor keybindings. This is when the compositor is * processing keys, rather than passing them on to the client for its own * processing. */ bool handled = false; for (int i = 0; i < LENGTH(keys); i++) { if (sym == keys[i].keysym && CLEANMASK(mods) == CLEANMASK(keys[i].mod) && keys[i].func) { keys[i].func(&keys[i].arg); handled = true; } } return handled; } void keypress(struct wl_listener *listener, void *data) { /* This event is raised when a key is pressed or released. */ Keyboard *keyboard = wl_container_of(listener, keyboard, key); struct wlr_event_keyboard_key *event = data; /* Translate libinput keycode -> xkbcommon */ uint32_t keycode = event->keycode + 8; /* Get a list of keysyms based on the keymap for this keyboard */ const xkb_keysym_t *syms; int nsyms = xkb_state_key_get_syms( keyboard->device->keyboard->xkb_state, keycode, &syms); bool handled = false; uint32_t mods = wlr_keyboard_get_modifiers(keyboard->device->keyboard); if (event->state == WLR_KEY_PRESSED) { /* On _press_, attempt to process a compositor keybinding. */ for (int i = 0; i < nsyms; i++) { handled = keybinding(mods, syms[i]) || handled; } } if (!handled) { /* Otherwise, we pass it along to the client. */ wlr_seat_set_keyboard(seat, keyboard->device); wlr_seat_keyboard_notify_key(seat, event->time_msec, event->keycode, event->state); } } void keypressmod(struct wl_listener *listener, void *data) { /* This event is raised when a modifier key, such as shift or alt, is * pressed. We simply communicate this to the client. */ Keyboard *keyboard = wl_container_of(listener, keyboard, modifiers); /* * A seat can only have one keyboard, but this is a limitation of the * Wayland protocol - not wlroots. We assign all connected keyboards to the * same seat. You can swap out the underlying wlr_keyboard like this and * wlr_seat handles this transparently. */ wlr_seat_set_keyboard(seat, keyboard->device); /* Send modifiers to the client. */ wlr_seat_keyboard_notify_modifiers(seat, &keyboard->device->keyboard->modifiers); } void maprequest(struct wl_listener *listener, void *data) { /* Called when the surface is mapped, or ready to display on-screen. */ Client *c = wl_container_of(listener, c, map); /* Insert this client into the list and focus it. */ c->mon = selmon; wl_list_insert(&clients, &c->link); wl_list_insert(&fstack, &c->flink); focus(c, c->xdg_surface->surface); } void motionabsolute(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 wlr_event_pointer_motion_absolute *event = data; wlr_cursor_warp_absolute(cursor, event->device, event->x, event->y); motionnotify(event->time_msec); } void motionnotify(uint32_t time) { /* Update selmon (even while dragging a window) */ selmon = xytomon(cursor->x, cursor->y); /* If we are currently grabbing the mouse, handle and return */ if (cursor_mode == CurMove) { /* Move the grabbed client to the new position. */ grabc->x = cursor->x - grabsx; grabc->y = cursor->y - grabsy; return; } else if (cursor_mode == CurResize) { /* * 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. */ wlr_xdg_toplevel_set_size(grabc->xdg_surface, cursor->x - grabc->x, cursor->y - grabc->y); return; } /* Otherwise, find the client under the pointer and send the event along. */ double sx, sy; struct wlr_surface *surface = NULL; Client *c = xytoclient(cursor->x, cursor->y, &surface, &sx, &sy); if (!c) { /* If there's no client 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 clients. */ wlr_xcursor_manager_set_cursor_image( cursor_mgr, "left_ptr", 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); } } void motionrelative(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 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(cursor, event->device, event->delta_x, event->delta_y); motionnotify(event->time_msec); } void movemouse(const Arg *arg) { double sx, sy; struct wlr_surface *surface; Client *c = xytoclient(cursor->x, cursor->y, &surface, &sx, &sy); if (!c) { return; } /* Prepare for moving client in motionnotify */ grabc = c; cursor_mode = CurMove; grabsx = cursor->x - c->x; grabsy = cursor->y - c->y; } void quit(const Arg *arg) { wl_display_terminate(wl_display); } void render(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 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 client has a position in layout coordinates. If you have two displays, * one next to the other, both 1080p, a client 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( output_layout, output, &ox, &oy); ox += rdata->x + sx, oy += rdata->y + sy; /* We also have to apply the scale factor for HiDPI outputs. This is only * part of the puzzle, dwl does not fully support HiDPI. */ struct wlr_box obox = { .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 matrices * in graphics programming. We need to prepare a matrix to render the * client with. wlr_matrix_project_box is a helper which takes a box with * a desired x, y coordinates, 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, &obox, 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(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); } void rendermon(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). */ Monitor *m = wl_container_of(listener, m, frame); struct timespec now; clock_gettime(CLOCK_MONOTONIC, &now); /* wlr_output_attach_render makes the OpenGL context current. */ if (!wlr_output_attach_render(m->wlr_output, NULL)) { return; } /* Get effective monitor geometry and window area */ m->geom = wlr_output_layout_get_box(output_layout, m->wlr_output); m->wx = m->geom->x; m->wy = m->geom->y; m->ww = m->geom->width; m->wh = m->geom->height; arrange(m); /* Begin the renderer (calls glViewport and some other GL sanity checks) */ wlr_renderer_begin(renderer, m->wlr_output->width, m->wlr_output->height); wlr_renderer_clear(renderer, rootcolor); /* Each subsequent window we render is rendered on top of the last. Because * our client list is ordered front-to-back, we iterate over it backwards. */ Client *c; wl_list_for_each_reverse(c, &clients, link) { struct render_data rdata = { .output = m->wlr_output, .when = &now, .x = c->x, .y = c->y, }; /* This calls our render function for each surface among the * xdg_surface's toplevel and popups. */ wlr_xdg_surface_for_each_surface(c->xdg_surface, render, &rdata); } /* Hardware cursors are rendered by the GPU on a separate plane, and can be * moved around without re-rendering what's beneath them - which is more * efficient. However, not all hardware supports hardware cursors. For this * reason, wlroots provides a software fallback, which we ask it to render * here. wlr_cursor handles configuring hardware vs software cursors for you, * and this function is a no-op when hardware cursors are in use. */ wlr_output_render_software_cursors(m->wlr_output, NULL); /* Conclude rendering and swap the buffers, showing the final frame * on-screen. */ wlr_renderer_end(renderer); wlr_output_commit(m->wlr_output); } void resize(Client *c, int x, int y, int w, int h) { c->x = x; c->y = y; wlr_xdg_toplevel_set_size(c->xdg_surface, w, h); } void resizemouse(const Arg *arg) { double sx, sy; struct wlr_surface *surface; Client *c = xytoclient(cursor->x, cursor->y, &surface, &sx, &sy); if (!c) { return; } struct wlr_box sbox; wlr_xdg_surface_get_geometry(c->xdg_surface, &sbox); /* Doesn't work for X11 output - the next absolute motion event * returns the cursor to where it started */ wlr_cursor_warp_closest(cursor, NULL, c->x + sbox.x + sbox.width, c->y + sbox.y + sbox.height); /* Prepare for resizing client in motionnotify */ grabc = c; cursor_mode = CurResize; } void run(char *startup_cmd) { pid_t startup_pid = -1; /* Add a Unix socket to the Wayland display. */ const char *socket = wl_display_add_socket_auto(wl_display); if (!socket) { wlr_backend_destroy(backend); exit(1); } /* Start the backend. This will enumerate outputs and inputs, become the DRM * master, etc */ if (!wlr_backend_start(backend)) { wlr_backend_destroy(backend); wl_display_destroy(wl_display); exit(1); } /* Now that outputs are initialized, choose initial selmon based on * cursor position */ selmon = xytomon(cursor->x, cursor->y); /* Set the WAYLAND_DISPLAY environment variable to our socket and run the * startup command if requested. */ setenv("WAYLAND_DISPLAY", socket, true); if (startup_cmd) { startup_pid = fork(); if (startup_pid < 0) { perror("startup: fork"); wl_display_destroy(wl_display); exit(1); } if (startup_pid == 0) { execl("/bin/sh", "/bin/sh", "-c", startup_cmd, (void *)NULL); perror("startup: execl"); wl_display_destroy(wl_display); exit(1); } } /* 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(wl_display); if (startup_cmd) { kill(startup_pid, SIGTERM); waitpid(startup_pid, NULL, 0); } } Client * selclient(void) { Client *c = wl_container_of(fstack.next, c, flink); if (wl_list_empty(&fstack) || !VISIBLEON(c, selmon)) return NULL; return c; } void setcursor(struct wl_listener *listener, void *data) { /* This event is raised by the seat when a client provides a cursor image */ struct wlr_seat_pointer_request_set_cursor_event *event = data; struct wlr_seat_client *focused_client = seat->pointer_state.focused_client; /* This can be sent by any client, so we check to make sure this one is * actually has pointer focus first. */ if (focused_client == event->seat_client) { /* Once we've vetted the client, we can tell the cursor to use the * provided surface as the cursor image. It will set the hardware cursor * on the output that it's currently on and continue to do so as the * cursor moves between outputs. */ wlr_cursor_set_surface(cursor, event->surface, event->hotspot_x, event->hotspot_y); } } void setlayout(const Arg *arg) { if (!arg || !arg->v || arg->v != selmon->lt[selmon->sellt]) selmon->sellt ^= 1; if (arg && arg->v) selmon->lt[selmon->sellt] = (Layout *)arg->v; /* XXX change layout symbol? */ } void setup(void) { /* 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). */ backend = wlr_backend_autocreate(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. */ renderer = wlr_backend_get_renderer(backend); wlr_renderer_init_wl_display(renderer, wl_display); /* This creates some hands-off wlroots interfaces. The compositor is * necessary for clients to allocate surfaces 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(wl_display, renderer); wlr_data_device_manager_create(wl_display); /* Creates an output layout, which a wlroots utility for working with an * arrangement of screens in a physical layout. */ output_layout = wlr_output_layout_create(); /* Configure a listener to be notified when new outputs are available on the * backend. */ wl_list_init(&mons); new_output.notify = createmon; wl_signal_add(&backend->events.new_output, &new_output); /* Set up our lists of clients and the xdg-shell. The xdg-shell is a * Wayland protocol which is used for application windows. For more * detail on shells, refer to the article: * * https://drewdevault.com/2018/07/29/Wayland-shells.html */ wl_list_init(&clients); wl_list_init(&fstack); xdg_shell = wlr_xdg_shell_create(wl_display); new_xdg_surface.notify = createnotify; wl_signal_add(&xdg_shell->events.new_surface, &new_xdg_surface); /* * Creates a cursor, which is a wlroots utility for tracking the cursor * image shown on screen. */ cursor = wlr_cursor_create(); wlr_cursor_attach_output_layout(cursor, 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. */ cursor_mgr = wlr_xcursor_manager_create(NULL, 24); wlr_xcursor_manager_load(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. */ cursor_motion.notify = motionrelative; wl_signal_add(&cursor->events.motion, &cursor_motion); cursor_motion_absolute.notify = motionabsolute; wl_signal_add(&cursor->events.motion_absolute, &cursor_motion_absolute); cursor_button.notify = buttonpress; wl_signal_add(&cursor->events.button, &cursor_button); cursor_axis.notify = axisnotify; wl_signal_add(&cursor->events.axis, &cursor_axis); cursor_frame.notify = cursorframe; wl_signal_add(&cursor->events.frame, &cursor_frame); /* * 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(&keyboards); new_input.notify = inputdevice; wl_signal_add(&backend->events.new_input, &new_input); seat = wlr_seat_create(wl_display, "seat0"); request_cursor.notify = setcursor; wl_signal_add(&seat->events.request_set_cursor, &request_cursor); } void spawn(const Arg *arg) { if (fork() == 0) { setsid(); execvp(((char **)arg->v)[0], (char **)arg->v); fprintf(stderr, "dwl: execvp %s", ((char **)arg->v)[0]); perror(" failed"); exit(EXIT_FAILURE); } } void tile(Monitor *m) { unsigned int i, n = 0, h, mw, my, ty; Client *c; struct wlr_box ca; wl_list_for_each(c, &clients, link) { if (VISIBLEON(c, m)) n++; } if (n == 0) return; if (n > m->nmaster) mw = m->nmaster ? m->ww * m->mfact : 0; else mw = m->ww; i = my = ty = 0; wl_list_for_each(c, &clients, link) { if (!VISIBLEON(c, m)) continue; wlr_xdg_surface_get_geometry(c->xdg_surface, &ca); if (i < m->nmaster) { h = (m->wh - my) / (MIN(n, m->nmaster) - i); resize(c, m->wx, m->wy + my, mw, h); my += ca.height; } else { h = (m->wh - ty) / (n - i); resize(c, m->wx + mw, m->wy + ty, m->ww - mw, h); ty += ca.height; } i++; } } void unmapnotify(struct wl_listener *listener, void *data) { /* Called when the surface is unmapped, and should no longer be shown. */ Client *c = wl_container_of(listener, c, unmap); wl_list_remove(&c->link); wl_list_remove(&c->flink); } Client * xytoclient(double x, double y, 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 clients being ordered from top-to-bottom. */ Client *c; wl_list_for_each(c, &clients, link) { /* * 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 x and y (in 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 _sx, _sy; struct wlr_surface *_surface = NULL; _surface = wlr_xdg_surface_surface_at(c->xdg_surface, x - c->x, y - c->y, &_sx, &_sy); if (_surface != NULL) { *sx = _sx; *sy = _sy; *surface = _surface; return c; } } return NULL; } Monitor * xytomon(double x, double y) { struct wlr_output *o = wlr_output_layout_output_at(output_layout, x, y); Monitor *m; wl_list_for_each(m, &mons, link) if (m->wlr_output == o) return m; return NULL; } 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; } /* The Wayland display is managed by libwayland. It handles accepting * clients from the Unix socket, manging Wayland globals, and so on. */ wl_display = wl_display_create(); setup(); run(startup_cmd); /* Once wl_display_run returns, we shut down the server. */ wl_display_destroy_clients(wl_display); wl_display_destroy(wl_display); return 0; }