wlroots/backend/backend.c

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
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#include <errno.h>
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#include <libinput.h>
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#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wayland-server-core.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>
#include <wlr/backend/noop.h>
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#include <wlr/backend/session.h>
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#include <wlr/backend/wayland.h>
#include <wlr/config.h>
#include <wlr/util/log.h>
#include "backend/backend.h"
#include "backend/multi.h"
#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,
const struct wlr_backend_impl *impl) {
assert(backend);
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backend->impl = impl;
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wl_signal_init(&backend->events.destroy);
wl_signal_init(&backend->events.new_input);
wl_signal_init(&backend->events.new_output);
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}
bool wlr_backend_start(struct wlr_backend *backend) {
if (backend->impl->start) {
return backend->impl->start(backend);
}
return true;
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}
void wlr_backend_destroy(struct wlr_backend *backend) {
if (!backend) {
return;
}
if (backend->impl && backend->impl->destroy) {
backend->impl->destroy(backend);
} else {
free(backend);
}
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}
struct wlr_renderer *wlr_backend_get_renderer(struct wlr_backend *backend) {
if (backend->impl->get_renderer) {
return backend->impl->get_renderer(backend);
}
return NULL;
}
struct wlr_session *wlr_backend_get_session(struct wlr_backend *backend) {
if (backend->impl->get_session) {
return backend->impl->get_session(backend);
}
return NULL;
}
clockid_t wlr_backend_get_presentation_clock(struct wlr_backend *backend) {
if (backend->impl->get_presentation_clock) {
return backend->impl->get_presentation_clock(backend);
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}
return CLOCK_MONOTONIC;
}
int wlr_backend_get_drm_fd(struct wlr_backend *backend) {
if (!backend->impl->get_drm_fd) {
return -1;
}
return backend->impl->get_drm_fd(backend);
}
uint32_t backend_get_buffer_caps(struct wlr_backend *backend) {
if (!backend->impl->get_buffer_caps) {
return 0;
}
return backend->impl->get_buffer_caps(backend);
}
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static size_t parse_outputs_env(const char *name) {
const char *outputs_str = getenv(name);
if (outputs_str == NULL) {
return 1;
}
char *end;
int outputs = (int)strtol(outputs_str, &end, 10);
if (*end || outputs < 0) {
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wlr_log(WLR_ERROR, "%s specified with invalid integer, ignoring", name);
return 1;
}
return outputs;
}
static struct wlr_backend *attempt_wl_backend(struct wl_display *display) {
struct wlr_backend *backend = wlr_wl_backend_create(display, NULL);
if (backend == NULL) {
return NULL;
}
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size_t outputs = parse_outputs_env("WLR_WL_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_wl_output_create(backend);
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}
return backend;
}
#if WLR_HAS_X11_BACKEND
static struct wlr_backend *attempt_x11_backend(struct wl_display *display,
const char *x11_display) {
struct wlr_backend *backend = wlr_x11_backend_create(display, x11_display);
if (backend == NULL) {
return NULL;
}
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size_t outputs = parse_outputs_env("WLR_X11_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_x11_output_create(backend);
}
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return backend;
}
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#endif
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static struct wlr_backend *attempt_headless_backend(
struct wl_display *display) {
struct wlr_backend *backend = wlr_headless_backend_create(display);
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if (backend == NULL) {
return NULL;
}
size_t outputs = parse_outputs_env("WLR_HEADLESS_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_headless_add_output(backend, 1280, 720);
}
return backend;
}
static struct wlr_backend *attempt_noop_backend(struct wl_display *display) {
struct wlr_backend *backend = wlr_noop_backend_create(display);
if (backend == NULL) {
return NULL;
}
size_t outputs = parse_outputs_env("WLR_NOOP_OUTPUTS");
for (size_t i = 0; i < outputs; ++i) {
wlr_noop_add_output(backend);
}
return backend;
}
static struct wlr_backend *attempt_drm_backend(struct wl_display *display,
struct wlr_backend *backend, struct wlr_session *session) {
struct wlr_device *gpus[8];
ssize_t num_gpus = wlr_session_find_gpus(session, 8, gpus);
if (num_gpus < 0) {
wlr_log(WLR_ERROR, "Failed to find GPUs");
return NULL;
}
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wlr_log(WLR_INFO, "Found %zu GPUs", num_gpus);
struct wlr_backend *primary_drm = NULL;
for (size_t i = 0; i < (size_t)num_gpus; ++i) {
struct wlr_backend *drm = wlr_drm_backend_create(display, session,
gpus[i], primary_drm);
if (!drm) {
wlr_log(WLR_ERROR, "Failed to create DRM backend");
continue;
}
if (!primary_drm) {
primary_drm = drm;
}
wlr_multi_backend_add(backend, drm);
}
return primary_drm;
}
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static struct wlr_backend *attempt_backend_by_name(struct wl_display *display,
struct wlr_backend *backend, struct wlr_session **session,
const char *name) {
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if (strcmp(name, "wayland") == 0) {
return attempt_wl_backend(display);
#if WLR_HAS_X11_BACKEND
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} else if (strcmp(name, "x11") == 0) {
return attempt_x11_backend(display, NULL);
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#endif
} else if (strcmp(name, "headless") == 0) {
return attempt_headless_backend(display);
} else if (strcmp(name, "noop") == 0) {
return attempt_noop_backend(display);
} else if (strcmp(name, "drm") == 0 || strcmp(name, "libinput") == 0) {
// DRM and libinput need a session
if (!*session) {
*session = wlr_session_create(display);
if (!*session) {
wlr_log(WLR_ERROR, "failed to start a session");
return NULL;
}
}
if (strcmp(name, "libinput") == 0) {
return wlr_libinput_backend_create(display, *session);
} else {
return attempt_drm_backend(display, backend, *session);
}
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}
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wlr_log(WLR_ERROR, "unrecognized backend '%s'", name);
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return NULL;
}
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
struct wlr_backend *backend = wlr_multi_backend_create(display);
struct wlr_multi_backend *multi = (struct wlr_multi_backend *)backend;
if (!backend) {
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wlr_log(WLR_ERROR, "could not allocate multibackend");
return NULL;
}
char *names = getenv("WLR_BACKENDS");
if (names) {
wlr_log(WLR_INFO, "Loading user-specified backends due to WLR_BACKENDS: %s",
names);
names = strdup(names);
if (names == NULL) {
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wlr_log(WLR_ERROR, "allocation failed");
wlr_backend_destroy(backend);
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return NULL;
}
char *saveptr;
char *name = strtok_r(names, ",", &saveptr);
while (name != NULL) {
struct wlr_backend *subbackend = attempt_backend_by_name(display,
backend, &multi->session, name);
if (subbackend == NULL) {
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wlr_log(WLR_ERROR, "failed to start backend '%s'", name);
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
free(names);
return NULL;
}
if (!wlr_multi_backend_add(backend, subbackend)) {
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wlr_log(WLR_ERROR, "failed to add backend '%s'", name);
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
free(names);
return NULL;
}
name = strtok_r(NULL, ",", &saveptr);
}
free(names);
return backend;
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}
if (getenv("WAYLAND_DISPLAY") || getenv("WAYLAND_SOCKET")) {
struct wlr_backend *wl_backend = attempt_wl_backend(display);
if (!wl_backend) {
goto error;
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}
wlr_multi_backend_add(backend, wl_backend);
return backend;
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}
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#if WLR_HAS_X11_BACKEND
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const char *x11_display = getenv("DISPLAY");
if (x11_display) {
struct wlr_backend *x11_backend =
attempt_x11_backend(display, x11_display);
if (!x11_backend) {
goto error;
}
wlr_multi_backend_add(backend, x11_backend);
return backend;
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}
#endif
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// Attempt DRM+libinput
multi->session = wlr_session_create(display);
if (!multi->session) {
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wlr_log(WLR_ERROR, "Failed to start a DRM session");
wlr_backend_destroy(backend);
return NULL;
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}
struct wlr_backend *libinput = wlr_libinput_backend_create(display,
multi->session);
if (!libinput) {
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wlr_log(WLR_ERROR, "Failed to start libinput backend");
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
return NULL;
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}
wlr_multi_backend_add(backend, libinput);
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struct wlr_backend *primary_drm =
attempt_drm_backend(display, backend, multi->session);
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if (!primary_drm) {
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wlr_log(WLR_ERROR, "Failed to open any DRM device");
wlr_backend_destroy(libinput);
wlr_session_destroy(multi->session);
wlr_backend_destroy(backend);
return NULL;
}
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return backend;
error:
wlr_backend_destroy(backend);
return NULL;
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}