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main.c: refactor main()

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This commit is contained in:
Johan Malm 2020-05-11 06:59:27 +01:00
parent 08225f6234
commit afdadb004b
1 changed files with 158 additions and 104 deletions
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262
main.c
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@ -8,9 +8,11 @@
int main(int argc, char *argv[]) int main(int argc, char *argv[])
{ {
wlr_log_init(WLR_ERROR, NULL); struct server server = { 0 };
char *startup_cmd = NULL; char *startup_cmd = NULL;
wlr_log_init(WLR_ERROR, NULL);
int c; int c;
while ((c = getopt(argc, argv, "s:h")) != -1) { while ((c = getopt(argc, argv, "s:h")) != -1) {
switch (c) { switch (c) {
@ -27,84 +29,115 @@ int main(int argc, char *argv[])
return 0; return 0;
} }
struct server server; /* Wayland requires XDG_RUNTIME_DIR to be set */
/* The Wayland display is managed by libwayland. It handles accepting if (!getenv("XDG_RUNTIME_DIR")) {
* clients from the Unix socket, manging Wayland globals, and so on. */ wlr_log(WLR_ERROR, "XDG_RUNTIME_DIR is not set");
server.wl_display = wl_display_create(); return 1;
/* 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 * 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();
if (!server.wl_display) {
wlr_log(WLR_ERROR, "cannot allocate a wayland display");
return 1;
}
/* TODO: Catch signals. Maybe SIGHUP for reconfigure */
/*
* 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 (!server.backend) {
wlr_log(WLR_ERROR, "unable to create the wlroots backend");
return 1;
}
/*
* 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 * formats it supports for shared memory, this configures that for
* clients. */ * clients.
*/
server.renderer = wlr_backend_get_renderer(server.backend); server.renderer = wlr_backend_get_renderer(server.backend);
wlr_renderer_init_wl_display(server.renderer, server.wl_display); wlr_renderer_init_wl_display(server.renderer, server.wl_display);
/* This creates some hands-off wlroots interfaces. The compositor is wl_list_init(&server.views);
wl_list_init(&server.outputs);
/*
* Create 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();
if (!server.output_layout) {
wlr_log(WLR_ERROR, "unable to create output layout");
return 1;
}
/*
* Create some hands-off wlroots interfaces. The compositor is
* necessary for clients to allocate surfaces and the data device * necessary for clients to allocate surfaces and the data device
* manager handles the clipboard. Each of these wlroots interfaces has * manager handles the clipboard. Each of these wlroots interfaces has
* room for you to dig your fingers in and play with their behavior if * room for you to dig your fingers in and play with their behavior if
* you want. */ * you want.
server.compositor = */
wlr_compositor_create(server.wl_display, server.renderer); server.compositor = wlr_compositor_create(server.wl_display,
wlr_data_device_manager_create(server.wl_display); server.renderer);
if (!server.compositor) {
wlr_log(WLR_ERROR, "unable to create the wlroots compositor");
return 1;
}
wlr_export_dmabuf_manager_v1_create(server.wl_display); struct wlr_data_device_manager *device_manager = NULL;
wlr_screencopy_manager_v1_create(server.wl_display); device_manager = wlr_data_device_manager_create(server.wl_display);
wlr_data_control_manager_v1_create(server.wl_display); if (!device_manager) {
wlr_gamma_control_manager_v1_create(server.wl_display); wlr_log(WLR_ERROR, "unable to create data device manager");
wlr_primary_selection_v1_device_manager_create(server.wl_display); return 1;
}
/* Creates an output layout, which a wlroots utility for working with an /*
* arrangement of screens in a physical layout. */ * Configure a listener to be notified when new outputs are available
server.output_layout = wlr_output_layout_create(); * on the backend.
*/
/* 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; server.new_output.notify = server_new_output;
wl_signal_add(&server.backend->events.new_output, &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 = xdg_surface_new;
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 * Configures a seat, which is a single "seat" at which a user sits
* image shown on screen. * 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.
*/ */
server.seat = wlr_seat_create(server.wl_display, "seat0");
if (!server.seat) {
wlr_log(WLR_ERROR, "cannot allocate seat0");
return 1;
}
server.cursor = wlr_cursor_create(); server.cursor = wlr_cursor_create();
if (!server.cursor) {
wlr_log(WLR_ERROR, "unable to create cursor");
return 1;
}
wlr_cursor_attach_output_layout(server.cursor, server.output_layout); wlr_cursor_attach_output_layout(server.cursor, server.output_layout);
server.cursor_mgr = wlr_xcursor_manager_create(NULL, XCURSOR_SIZE);
if (!server.cursor_mgr) {
wlr_log(WLR_ERROR, "cannot create xcursor manager");
return 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; server.cursor_motion.notify = server_cursor_motion;
wl_signal_add(&server.cursor->events.motion, &server.cursor_motion); wl_signal_add(&server.cursor->events.motion, &server.cursor_motion);
server.cursor_motion_absolute.notify = server_cursor_motion_absolute; server.cursor_motion_absolute.notify = server_cursor_motion_absolute;
@ -117,62 +150,63 @@ int main(int argc, char *argv[])
server.cursor_frame.notify = server_cursor_frame; server.cursor_frame.notify = server_cursor_frame;
wl_signal_add(&server.cursor->events.frame, &server.cursor_frame); wl_signal_add(&server.cursor->events.frame, &server.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(&server.keyboards); wl_list_init(&server.keyboards);
server.new_input.notify = server_new_input; server.new_input.notify = server_new_input;
wl_signal_add(&server.backend->events.new_input, &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; server.request_cursor.notify = seat_request_cursor;
wl_signal_add(&server.seat->events.request_set_cursor, wl_signal_add(&server.seat->events.request_set_cursor,
&server.request_cursor); &server.request_cursor);
/* Add a Unix socket to the Wayland display. */ /* Init xdg-shell */
const char *socket = wl_display_add_socket_auto(server.wl_display); server.xdg_shell = wlr_xdg_shell_create(server.wl_display);
if (!socket) { if (!server.xdg_shell) {
wlr_backend_destroy(server.backend); wlr_log(WLR_ERROR, "unable to create the XDG shell interface");
return 1; return 1;
} }
server.new_xdg_surface.notify = xdg_surface_new;
wl_signal_add(&server.xdg_shell->events.new_surface,
&server.new_xdg_surface);
/* Start the backend. This will enumerate outputs and inputs, become the /* TODO: wlr_xdg_decoration_manager_v1_create() */
* 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 /* FIXME: Check return values */
* the startup command if requested. */ wlr_export_dmabuf_manager_v1_create(server.wl_display);
setenv("WAYLAND_DISPLAY", socket, true); wlr_screencopy_manager_v1_create(server.wl_display);
wlr_data_control_manager_v1_create(server.wl_display);
wl_display_init_shm(server.wl_display); wlr_gamma_control_manager_v1_create(server.wl_display);
wlr_primary_selection_v1_device_manager_create(server.wl_display);
/* Init xwayland */ /* Init xwayland */
server.xwayland = wlr_xwayland_create(server.wl_display, server.xwayland = wlr_xwayland_create(server.wl_display,
server.compositor, false); server.compositor, false);
if (!server.xwayland) {
wlr_log(WLR_ERROR, "cannot create xwayland server");
return 1;
}
server.new_xwayland_surface.notify = xwl_surface_new; server.new_xwayland_surface.notify = xwl_surface_new;
wl_signal_add(&server.xwayland->events.new_surface, wl_signal_add(&server.xwayland->events.new_surface,
&server.new_xwayland_surface); &server.new_xwayland_surface);
setenv("DISPLAY", server.xwayland->display_name, true);
wlr_xwayland_set_seat(server.xwayland, server.seat);
/* Creates an xcursor manager, another wlroots utility which loads up server.cursor_mgr = wlr_xcursor_manager_create(XCURSOR_DEFAULT,
* Xcursor themes to source cursor images from and makes sure that XCURSOR_SIZE);
* cursor images are available at all scale factors on the screen if (!server.cursor_mgr) {
* (necessary for wlr_log(WLR_ERROR, "cannot create xwayland xcursor manager");
* HiDPI support). We add a cursor theme at scale factor 1 to begin return 1;
* with. */ }
server.cursor_mgr =
wlr_xcursor_manager_create(XCURSOR_DEFAULT, XCURSOR_SIZE);
wlr_xcursor_manager_load(server.cursor_mgr, 1);
struct wlr_xcursor *xcursor = wlr_xcursor_manager_get_xcursor( if (setenv("DISPLAY", server.xwayland->display_name, true) < 0)
server.cursor_mgr, XCURSOR_DEFAULT, 1); wlr_log_errno(WLR_ERROR, "Unable to set DISPLAY for XWayland."
" Clients may not be able to connect");
else
wlr_log(WLR_DEBUG, "XWayland is running on display %s",
server.xwayland->display_name);
if (wlr_xcursor_manager_load(server.cursor_mgr, 1))
wlr_log(WLR_ERROR, "cannot load xwayland xcursor theme");
struct wlr_xcursor *xcursor;
xcursor = wlr_xcursor_manager_get_xcursor(server.cursor_mgr,
XCURSOR_DEFAULT, 1);
if (xcursor) { if (xcursor) {
struct wlr_xcursor_image *image = xcursor->images[0]; struct wlr_xcursor_image *image = xcursor->images[0];
wlr_xwayland_set_cursor(server.xwayland, image->buffer, wlr_xwayland_set_cursor(server.xwayland, image->buffer,
@ -181,21 +215,41 @@ int main(int argc, char *argv[])
image->hotspot_y); image->hotspot_y);
} }
/* Add a Unix socket to the Wayland display. */
const char *socket = wl_display_add_socket_auto(server.wl_display);
if (!socket) {
wlr_log_errno(WLR_ERROR, "unable to open wayland socket");
return 1;
}
/*
* Start the backend. This will enumerate outputs and inputs, become
* the DRM master, etc
*/
if (!wlr_backend_start(server.backend)) {
wlr_log(WLR_ERROR, "unable to start the wlroots backend");
return 1;
}
setenv("WAYLAND_DISPLAY", socket, true);
if (setenv("WAYLAND_DISPLAY", socket, true) < 0)
wlr_log_errno(WLR_ERROR, "unable to set WAYLAND_DISPLAY");
else
wlr_log(WLR_DEBUG, "WAYLAND_DISPLAY=%s", socket);
wl_display_init_shm(server.wl_display);
wlr_xwayland_set_seat(server.xwayland, server.seat);
if (startup_cmd) { if (startup_cmd) {
if (fork() == 0) { if (fork() == 0) {
execl("/bin/sh", "/bin/sh", "-c", startup_cmd, execl("/bin/sh", "/bin/sh", "-c", startup_cmd,
(void *)NULL); (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); wl_display_run(server.wl_display);
/* Once wl_display_run returns, we shut down the server. */
wlr_xwayland_destroy(server.xwayland); wlr_xwayland_destroy(server.xwayland);
wlr_xcursor_manager_destroy(server.cursor_mgr); wlr_xcursor_manager_destroy(server.cursor_mgr);
wl_display_destroy_clients(server.wl_display); wl_display_destroy_clients(server.wl_display);