mirror of
https://gitlab.freedesktop.org/wlroots/wlroots.git
synced 2024-11-22 07:02:28 +00:00
7ec5bf6b10
This new functions cleans up the common backend state. While this currently only emits the destroy signal, this will also clean up the renderer and allocator in upcoming patches.
341 lines
8.3 KiB
C
341 lines
8.3 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-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>
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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/backend.h"
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#include "backend/multi.h"
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#include "util/signal.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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void wlr_backend_finish(struct wlr_backend *backend) {
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wlr_signal_emit_safe(&backend->events.destroy, backend);
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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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int wlr_backend_get_drm_fd(struct wlr_backend *backend) {
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if (!backend->impl->get_drm_fd) {
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return -1;
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}
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return backend->impl->get_drm_fd(backend);
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}
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uint32_t backend_get_buffer_caps(struct wlr_backend *backend) {
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if (!backend->impl->get_buffer_caps) {
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return 0;
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}
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return backend->impl->get_buffer_caps(backend);
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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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struct wlr_backend *backend = wlr_wl_backend_create(display, NULL);
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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) {
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struct wlr_backend *backend = wlr_x11_backend_create(display, x11_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_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) {
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struct wlr_backend *backend = wlr_headless_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_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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struct wlr_device *gpus[8];
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ssize_t num_gpus = wlr_session_find_gpus(session, 8, gpus);
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if (num_gpus < 0) {
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wlr_log(WLR_ERROR, "Failed to find GPUs");
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return NULL;
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}
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wlr_log(WLR_INFO, "Found %zu GPUs", num_gpus);
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struct wlr_backend *primary_drm = NULL;
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for (size_t i = 0; i < (size_t)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);
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if (!drm) {
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wlr_log(WLR_ERROR, "Failed to create DRM backend");
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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) {
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if (strcmp(name, "wayland") == 0) {
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return attempt_wl_backend(display);
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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);
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#endif
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} else if (strcmp(name, "headless") == 0) {
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return attempt_headless_backend(display);
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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);
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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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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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wlr_log(WLR_INFO, "Loading user-specified backends due to WLR_BACKENDS: %s",
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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);
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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_SOCKET")) {
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struct wlr_backend *wl_backend = attempt_wl_backend(display);
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if (!wl_backend) {
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goto error;
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}
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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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#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);
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if (!x11_backend) {
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goto error;
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}
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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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#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 =
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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");
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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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error:
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wlr_backend_destroy(backend);
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return NULL;
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}
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