mirror of
https://gitlab.freedesktop.org/wlroots/wlroots.git
synced 2024-11-22 07:02:28 +00:00
9b4be5a595
The noop backend is similar to headless, but it doesn't contain a renderer. It can be used as a place to stash views for when there's no physical outputs connected.
309 lines
8.2 KiB
C
309 lines
8.2 KiB
C
#define _POSIX_C_SOURCE 200809L
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#include <assert.h>
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#include <errno.h>
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#include <libinput.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wayland-server.h>
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#include <wlr/backend/drm.h>
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#include <wlr/backend/headless.h>
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#include <wlr/backend/interface.h>
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#include <wlr/backend/libinput.h>
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#include <wlr/backend/multi.h>
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#include <wlr/backend/noop.h>
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#include <wlr/backend/session.h>
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#include <wlr/backend/wayland.h>
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#include <wlr/config.h>
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#include <wlr/util/log.h>
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#include "backend/multi.h"
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#if WLR_HAS_X11_BACKEND
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#include <wlr/backend/x11.h>
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#endif
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void wlr_backend_init(struct wlr_backend *backend,
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const struct wlr_backend_impl *impl) {
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assert(backend);
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backend->impl = impl;
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wl_signal_init(&backend->events.destroy);
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wl_signal_init(&backend->events.new_input);
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wl_signal_init(&backend->events.new_output);
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}
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bool wlr_backend_start(struct wlr_backend *backend) {
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if (backend->impl->start) {
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return backend->impl->start(backend);
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}
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return true;
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}
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void wlr_backend_destroy(struct wlr_backend *backend) {
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if (!backend) {
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return;
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}
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if (backend->impl && backend->impl->destroy) {
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backend->impl->destroy(backend);
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} else {
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free(backend);
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}
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}
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struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend) {
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if (backend->impl->get_renderer) {
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return backend->impl->get_renderer(backend);
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}
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return NULL;
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}
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struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend) {
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if (backend->impl->get_session) {
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return backend->impl->get_session(backend);
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}
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return NULL;
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}
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clockid_t wlr_backend_get_presentation_clock(struct wlr_backend *backend) {
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if (backend->impl->get_presentation_clock) {
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return backend->impl->get_presentation_clock(backend);
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}
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return CLOCK_MONOTONIC;
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}
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static size_t parse_outputs_env(const char *name) {
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const char *outputs_str = getenv(name);
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if (outputs_str == NULL) {
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return 1;
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}
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char *end;
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int outputs = (int)strtol(outputs_str, &end, 10);
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if (*end || outputs < 0) {
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wlr_log(WLR_ERROR, "%s specified with invalid integer, ignoring", name);
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return 1;
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}
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return outputs;
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}
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static struct wlr_backend *attempt_wl_backend(struct wl_display *display,
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wlr_renderer_create_func_t create_renderer_func) {
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struct wlr_backend *backend = wlr_wl_backend_create(display, NULL, create_renderer_func);
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if (backend == NULL) {
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return NULL;
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}
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size_t outputs = parse_outputs_env("WLR_WL_OUTPUTS");
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for (size_t i = 0; i < outputs; ++i) {
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wlr_wl_output_create(backend);
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}
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return backend;
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}
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#if WLR_HAS_X11_BACKEND
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static struct wlr_backend *attempt_x11_backend(struct wl_display *display,
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const char *x11_display, wlr_renderer_create_func_t create_renderer_func) {
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struct wlr_backend *backend = wlr_x11_backend_create(display, x11_display, create_renderer_func);
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if (backend == NULL) {
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return NULL;
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}
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size_t outputs = parse_outputs_env("WLR_X11_OUTPUTS");
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for (size_t i = 0; i < outputs; ++i) {
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wlr_x11_output_create(backend);
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}
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return backend;
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}
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#endif
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static struct wlr_backend *attempt_headless_backend(
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struct wl_display *display, wlr_renderer_create_func_t create_renderer_func) {
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struct wlr_backend *backend = wlr_headless_backend_create(display, create_renderer_func);
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if (backend == NULL) {
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return NULL;
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}
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size_t outputs = parse_outputs_env("WLR_HEADLESS_OUTPUTS");
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for (size_t i = 0; i < outputs; ++i) {
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wlr_headless_add_output(backend, 1280, 720);
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}
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return backend;
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}
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static struct wlr_backend *attempt_noop_backend(struct wl_display *display) {
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struct wlr_backend *backend = wlr_noop_backend_create(display);
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if (backend == NULL) {
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return NULL;
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}
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size_t outputs = parse_outputs_env("WLR_NOOP_OUTPUTS");
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for (size_t i = 0; i < outputs; ++i) {
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wlr_noop_add_output(backend);
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}
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return backend;
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}
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static struct wlr_backend *attempt_drm_backend(struct wl_display *display,
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struct wlr_backend *backend, struct wlr_session *session,
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wlr_renderer_create_func_t create_renderer_func) {
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int gpus[8];
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size_t num_gpus = wlr_session_find_gpus(session, 8, gpus);
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struct wlr_backend *primary_drm = NULL;
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wlr_log(WLR_INFO, "Found %zu GPUs", num_gpus);
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for (size_t i = 0; i < num_gpus; ++i) {
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struct wlr_backend *drm = wlr_drm_backend_create(display, session,
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gpus[i], primary_drm, create_renderer_func);
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if (!drm) {
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wlr_log(WLR_ERROR, "Failed to open DRM device %d", gpus[i]);
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continue;
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}
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if (!primary_drm) {
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primary_drm = drm;
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}
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wlr_multi_backend_add(backend, drm);
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}
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return primary_drm;
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}
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static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
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struct wlr_backend *backend, struct wlr_session **session,
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const char *name, wlr_renderer_create_func_t create_renderer_func) {
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if (strcmp(name, "wayland") == 0) {
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return attempt_wl_backend(display, create_renderer_func);
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#if WLR_HAS_X11_BACKEND
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} else if (strcmp(name, "x11") == 0) {
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return attempt_x11_backend(display, NULL, create_renderer_func);
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#endif
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} else if (strcmp(name, "headless") == 0) {
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return attempt_headless_backend(display, create_renderer_func);
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} else if (strcmp(name, "noop") == 0) {
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return attempt_noop_backend(display);
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} else if (strcmp(name, "drm") == 0 || strcmp(name, "libinput") == 0) {
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// DRM and libinput need a session
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if (!*session) {
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*session = wlr_session_create(display);
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if (!*session) {
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wlr_log(WLR_ERROR, "failed to start a session");
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return NULL;
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}
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}
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if (strcmp(name, "libinput") == 0) {
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return wlr_libinput_backend_create(display, *session);
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} else {
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return attempt_drm_backend(display, backend, *session, create_renderer_func);
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}
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}
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wlr_log(WLR_ERROR, "unrecognized backend '%s'", name);
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return NULL;
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}
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struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
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wlr_renderer_create_func_t create_renderer_func) {
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struct wlr_backend *backend = wlr_multi_backend_create(display);
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struct wlr_multi_backend *multi = (struct wlr_multi_backend *)backend;
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if (!backend) {
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wlr_log(WLR_ERROR, "could not allocate multibackend");
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return NULL;
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}
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char *names = getenv("WLR_BACKENDS");
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if (names) {
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names = strdup(names);
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if (names == NULL) {
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wlr_log(WLR_ERROR, "allocation failed");
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wlr_backend_destroy(backend);
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return NULL;
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}
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char *saveptr;
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char *name = strtok_r(names, ",", &saveptr);
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while (name != NULL) {
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struct wlr_backend *subbackend = attempt_backend_by_name(display,
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backend, &multi->session, name, create_renderer_func);
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if (subbackend == NULL) {
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wlr_log(WLR_ERROR, "failed to start backend '%s'", name);
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wlr_session_destroy(multi->session);
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wlr_backend_destroy(backend);
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free(names);
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return NULL;
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}
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if (!wlr_multi_backend_add(backend, subbackend)) {
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wlr_log(WLR_ERROR, "failed to add backend '%s'", name);
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wlr_session_destroy(multi->session);
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wlr_backend_destroy(backend);
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free(names);
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return NULL;
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}
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name = strtok_r(NULL, ",", &saveptr);
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}
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free(names);
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return backend;
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}
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if (getenv("WAYLAND_DISPLAY") || getenv("_WAYLAND_DISPLAY") ||
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getenv("WAYLAND_SOCKET")) {
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struct wlr_backend *wl_backend = attempt_wl_backend(display,
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create_renderer_func);
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if (wl_backend) {
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wlr_multi_backend_add(backend, wl_backend);
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return backend;
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}
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}
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#if WLR_HAS_X11_BACKEND
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const char *x11_display = getenv("DISPLAY");
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if (x11_display) {
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struct wlr_backend *x11_backend =
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attempt_x11_backend(display, x11_display, create_renderer_func);
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if (x11_backend) {
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wlr_multi_backend_add(backend, x11_backend);
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return backend;
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}
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}
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#endif
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// Attempt DRM+libinput
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multi->session = wlr_session_create(display);
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if (!multi->session) {
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wlr_log(WLR_ERROR, "Failed to start a DRM session");
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wlr_backend_destroy(backend);
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return NULL;
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}
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struct wlr_backend *libinput = wlr_libinput_backend_create(display,
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multi->session);
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if (!libinput) {
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wlr_log(WLR_ERROR, "Failed to start libinput backend");
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wlr_session_destroy(multi->session);
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wlr_backend_destroy(backend);
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return NULL;
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}
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wlr_multi_backend_add(backend, libinput);
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struct wlr_backend *primary_drm = attempt_drm_backend(display, backend,
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multi->session, create_renderer_func);
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if (!primary_drm) {
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wlr_log(WLR_ERROR, "Failed to open any DRM device");
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wlr_backend_destroy(libinput);
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wlr_session_destroy(multi->session);
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wlr_backend_destroy(backend);
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return NULL;
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}
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return backend;
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}
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