mirror of
https://github.com/hyprwm/wlroots-hyprland.git
synced 2024-12-23 02:19:49 +01:00
bec94cc040
Instead of littering #ifdefs everywhere, move them to the dedicated attempt_XXX_backend() functions. This makes the logic in wlr_backend_autocreate() more readable, and provides better error messages when the X11/Wayland backends are disabled at compile-time, or when WLR_BACKENDS contains a backend disabled at compile-time.
398 lines
9.6 KiB
C
398 lines
9.6 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 <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/headless.h>
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#include <wlr/backend/interface.h>
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#include <wlr/backend/multi.h>
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#include <wlr/backend/wayland.h>
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#include <wlr/config.h>
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#include <wlr/render/wlr_renderer.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 "render/allocator/allocator.h"
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#include "util/env.h"
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#include "util/time.h"
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#if WLR_HAS_SESSION
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#include <wlr/backend/session.h>
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#endif
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#if WLR_HAS_DRM_BACKEND
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#include <wlr/backend/drm.h>
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#include "backend/drm/monitor.h"
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#endif
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#if WLR_HAS_LIBINPUT_BACKEND
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#include <wlr/backend/libinput.h>
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#endif
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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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#define WAIT_SESSION_TIMEOUT 10000 // ms
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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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memset(backend, 0, sizeof(*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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wl_signal_emit_mutable(&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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static struct wlr_session *session_create_and_wait(struct wl_display *disp) {
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#if WLR_HAS_SESSION
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struct wlr_session *session = wlr_session_create(disp);
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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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if (!session->active) {
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wlr_log(WLR_INFO, "Waiting for a session to become active");
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int64_t started_at = get_current_time_msec();
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int64_t timeout = WAIT_SESSION_TIMEOUT;
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struct wl_event_loop *event_loop =
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wl_display_get_event_loop(session->display);
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while (!session->active) {
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int ret = wl_event_loop_dispatch(event_loop, (int)timeout);
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if (ret < 0) {
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wlr_log_errno(WLR_ERROR, "Failed to wait for session active: "
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"wl_event_loop_dispatch failed");
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return NULL;
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}
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int64_t now = get_current_time_msec();
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if (now >= started_at + WAIT_SESSION_TIMEOUT) {
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break;
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}
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timeout = started_at + WAIT_SESSION_TIMEOUT - now;
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}
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if (!session->active) {
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wlr_log(WLR_ERROR, "Timeout waiting session to become active");
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return NULL;
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}
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}
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return session;
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#else
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wlr_log(WLR_ERROR, "Cannot create session: disabled at compile-time");
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return NULL;
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#endif
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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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static struct wlr_backend *attempt_x11_backend(struct wl_display *display,
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const char *x11_display) {
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#if WLR_HAS_X11_BACKEND
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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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#else
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wlr_log(WLR_ERROR, "Cannot create X11 backend: disabled at compile-time");
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return NULL;
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#endif
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}
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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 bool attempt_drm_backend(struct wl_display *display,
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struct wlr_backend *backend, struct wlr_session *session) {
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#if WLR_HAS_DRM_BACKEND
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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 false;
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}
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if (num_gpus == 0) {
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wlr_log(WLR_ERROR, "Found 0 GPUs, cannot create backend");
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return false;
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} else {
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wlr_log(WLR_INFO, "Found %zu GPUs", num_gpus);
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}
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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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if (!primary_drm) {
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wlr_log(WLR_ERROR, "Could not successfully create backend on any GPU");
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return NULL;
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}
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if (getenv("WLR_DRM_DEVICES") == NULL) {
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drm_backend_monitor_create(backend, primary_drm, session);
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}
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return true;
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#else
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wlr_log(WLR_ERROR, "Cannot create DRM backend: disabled at compile-time");
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return false;
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#endif
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}
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static struct wlr_backend *attempt_libinput_backend(struct wl_display *display,
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struct wlr_session *session) {
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#if WLR_HAS_LIBINPUT_BACKEND
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return wlr_libinput_backend_create(display, session);
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#else
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wlr_log(WLR_ERROR, "Cannot create libinput backend: disabled at compile-time");
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return NULL;
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#endif
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}
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static bool attempt_backend_by_name(struct wl_display *display,
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struct wlr_backend *multi, char *name,
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struct wlr_session **session_ptr) {
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struct wlr_backend *backend = NULL;
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if (strcmp(name, "wayland") == 0) {
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backend = attempt_wl_backend(display);
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} else if (strcmp(name, "x11") == 0) {
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backend = attempt_x11_backend(display, NULL);
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} else if (strcmp(name, "headless") == 0) {
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backend = attempt_headless_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_ptr == NULL) {
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*session_ptr = session_create_and_wait(display);
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if (*session_ptr == NULL) {
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wlr_log(WLR_ERROR, "failed to start a session");
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return false;
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}
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}
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if (strcmp(name, "libinput") == 0) {
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backend = attempt_libinput_backend(display, *session_ptr);
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} else {
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// attempt_drm_backend() adds the multi drm backends itself
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return attempt_drm_backend(display, multi, *session_ptr);
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}
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} else {
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wlr_log(WLR_ERROR, "unrecognized backend '%s'", name);
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return false;
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}
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if (backend == NULL) {
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return false;
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}
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return wlr_multi_backend_add(multi, backend);
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}
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struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
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struct wlr_session **session_ptr) {
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if (session_ptr != NULL) {
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*session_ptr = NULL;
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}
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struct wlr_session *session = NULL;
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struct wlr_backend *multi = wlr_multi_backend_create(display);
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if (!multi) {
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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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goto error;
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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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if (!attempt_backend_by_name(display, multi, name, &session)) {
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wlr_log(WLR_ERROR, "failed to add backend '%s'", name);
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free(names);
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goto error;
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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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goto success;
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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(multi, wl_backend);
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goto success;
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}
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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(multi, x11_backend);
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goto success;
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}
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// Attempt DRM+libinput
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session = session_create_and_wait(display);
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if (!session) {
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wlr_log(WLR_ERROR, "Failed to start a DRM session");
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goto error;
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}
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struct wlr_backend *libinput = attempt_libinput_backend(display, session);
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if (libinput) {
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wlr_multi_backend_add(multi, libinput);
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} else if (env_parse_bool("WLR_LIBINPUT_NO_DEVICES")) {
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wlr_log(WLR_INFO, "WLR_LIBINPUT_NO_DEVICES is set, "
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"starting without libinput backend");
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} else {
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wlr_log(WLR_ERROR, "Failed to start libinput backend");
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wlr_log(WLR_ERROR, "Set WLR_LIBINPUT_NO_DEVICES=1 to skip libinput");
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goto error;
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}
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if (!attempt_drm_backend(display, multi, session)) {
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wlr_log(WLR_ERROR, "Failed to open any DRM device");
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goto error;
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}
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success:
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if (session_ptr != NULL) {
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*session_ptr = session;
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}
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return multi;
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error:
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wlr_backend_destroy(multi);
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#if WLR_HAS_SESSION
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wlr_session_destroy(session);
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#endif
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return NULL;
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}
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