wlroots/backend/wayland/backend.c

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <fcntl.h>
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#include <limits.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/config.h>
#include <drm_fourcc.h>
#include <wayland-server-core.h>
#include <xf86drm.h>
#include <wlr/backend/interface.h>
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#include <wlr/interfaces/wlr_input_device.h>
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#include <wlr/interfaces/wlr_output.h>
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#include <wlr/util/log.h>
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#include "backend/wayland.h"
#include "render/drm_format_set.h"
#include "render/gbm_allocator.h"
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#include "render/wlr_renderer.h"
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#include "util/signal.h"
#include "drm-client-protocol.h"
#include "linux-dmabuf-unstable-v1-client-protocol.h"
#include "pointer-gestures-unstable-v1-client-protocol.h"
#include "presentation-time-client-protocol.h"
#include "xdg-decoration-unstable-v1-client-protocol.h"
#include "xdg-shell-client-protocol.h"
#include "tablet-unstable-v2-client-protocol.h"
#include "relative-pointer-unstable-v1-client-protocol.h"
struct wlr_wl_backend *get_wl_backend_from_backend(struct wlr_backend *backend) {
assert(wlr_backend_is_wl(backend));
return (struct wlr_wl_backend *)backend;
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}
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static int dispatch_events(int fd, uint32_t mask, void *data) {
struct wlr_wl_backend *wl = data;
if ((mask & WL_EVENT_HANGUP) || (mask & WL_EVENT_ERROR)) {
if (mask & WL_EVENT_ERROR) {
wlr_log(WLR_ERROR, "Failed to read from remote Wayland display");
}
wl_display_terminate(wl->local_display);
return 0;
}
int count = 0;
if (mask & WL_EVENT_READABLE) {
count = wl_display_dispatch(wl->remote_display);
}
if (mask & WL_EVENT_WRITABLE) {
wl_display_flush(wl->remote_display);
}
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if (mask == 0) {
count = wl_display_dispatch_pending(wl->remote_display);
wl_display_flush(wl->remote_display);
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}
if (count < 0) {
wlr_log(WLR_ERROR, "Failed to dispatch remote Wayland display");
wl_display_terminate(wl->local_display);
return 0;
}
return count;
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}
static void xdg_wm_base_handle_ping(void *data,
struct xdg_wm_base *base, uint32_t serial) {
xdg_wm_base_pong(base, serial);
}
static const struct xdg_wm_base_listener xdg_wm_base_listener = {
xdg_wm_base_handle_ping,
};
static void linux_dmabuf_v1_handle_format(void *data,
struct zwp_linux_dmabuf_v1 *linux_dmabuf_v1, uint32_t format) {
// Note, this event is deprecated
struct wlr_wl_backend *wl = data;
wlr_drm_format_set_add(&wl->linux_dmabuf_v1_formats, format,
DRM_FORMAT_MOD_INVALID);
}
static void linux_dmabuf_v1_handle_modifier(void *data,
struct zwp_linux_dmabuf_v1 *linux_dmabuf_v1, uint32_t format,
uint32_t modifier_hi, uint32_t modifier_lo) {
struct wlr_wl_backend *wl = data;
uint64_t modifier = ((uint64_t)modifier_hi << 32) | modifier_lo;
wlr_drm_format_set_add(&wl->linux_dmabuf_v1_formats, format, modifier);
}
static const struct zwp_linux_dmabuf_v1_listener linux_dmabuf_v1_listener = {
.format = linux_dmabuf_v1_handle_format,
.modifier = linux_dmabuf_v1_handle_modifier,
};
static bool device_has_name(const drmDevice *device, const char *name) {
for (size_t i = 0; i < DRM_NODE_MAX; i++) {
if (!(device->available_nodes & (1 << i))) {
continue;
}
if (strcmp(device->nodes[i], name) == 0) {
return true;
}
}
return false;
}
static char *get_render_name(const char *name) {
uint32_t flags = 0;
int devices_len = drmGetDevices2(flags, NULL, 0);
if (devices_len < 0) {
wlr_log(WLR_ERROR, "drmGetDevices2 failed");
return NULL;
}
drmDevice **devices = calloc(devices_len, sizeof(drmDevice *));
if (devices == NULL) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
devices_len = drmGetDevices2(flags, devices, devices_len);
if (devices_len < 0) {
free(devices);
wlr_log(WLR_ERROR, "drmGetDevices2 failed");
return NULL;
}
const drmDevice *match = NULL;
for (int i = 0; i < devices_len; i++) {
if (device_has_name(devices[i], name)) {
match = devices[i];
break;
}
}
char *render_name = NULL;
if (match == NULL) {
wlr_log(WLR_ERROR, "Cannot find DRM device %s", name);
} else if (!(match->available_nodes & (1 << DRM_NODE_RENDER))) {
wlr_log(WLR_ERROR, "DRM device %s has no render node", name);
} else {
render_name = strdup(match->nodes[DRM_NODE_RENDER]);
}
for (int i = 0; i < devices_len; i++) {
drmFreeDevice(&devices[i]);
}
free(devices);
return render_name;
}
static void legacy_drm_handle_device(void *data, struct wl_drm *drm,
const char *name) {
struct wlr_wl_backend *wl = data;
// TODO: get FD from linux-dmabuf hints instead
wl->drm_render_name = get_render_name(name);
}
static void legacy_drm_handle_format(void *data, struct wl_drm *drm,
uint32_t format) {
// This space is intentionally left blank
}
static void legacy_drm_handle_authenticated(void *data, struct wl_drm *drm) {
// This space is intentionally left blank
}
static void legacy_drm_handle_capabilities(void *data, struct wl_drm *drm,
uint32_t caps) {
// This space is intentionally left blank
}
static const struct wl_drm_listener legacy_drm_listener = {
.device = legacy_drm_handle_device,
.format = legacy_drm_handle_format,
.authenticated = legacy_drm_handle_authenticated,
.capabilities = legacy_drm_handle_capabilities,
};
static void registry_global(void *data, struct wl_registry *registry,
uint32_t name, const char *iface, uint32_t version) {
struct wlr_wl_backend *wl = data;
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wlr_log(WLR_DEBUG, "Remote wayland global: %s v%" PRIu32, iface, version);
if (strcmp(iface, wl_compositor_interface.name) == 0) {
wl->compositor = wl_registry_bind(registry, name,
&wl_compositor_interface, 4);
} else if (strcmp(iface, wl_seat_interface.name) == 0) {
struct wl_seat *wl_seat = wl_registry_bind(registry, name,
&wl_seat_interface, 5);
if (!create_wl_seat(wl_seat, wl)) {
wl_seat_destroy(wl_seat);
}
} else if (strcmp(iface, xdg_wm_base_interface.name) == 0) {
wl->xdg_wm_base = wl_registry_bind(registry, name,
&xdg_wm_base_interface, 1);
xdg_wm_base_add_listener(wl->xdg_wm_base, &xdg_wm_base_listener, NULL);
} else if (strcmp(iface, zxdg_decoration_manager_v1_interface.name) == 0) {
wl->zxdg_decoration_manager_v1 = wl_registry_bind(registry, name,
&zxdg_decoration_manager_v1_interface, 1);
} else if (strcmp(iface, zwp_pointer_gestures_v1_interface.name) == 0) {
wl->zwp_pointer_gestures_v1 = wl_registry_bind(registry, name,
&zwp_pointer_gestures_v1_interface, 1);
} else if (strcmp(iface, wp_presentation_interface.name) == 0) {
wl->presentation = wl_registry_bind(registry, name,
&wp_presentation_interface, 1);
} else if (strcmp(iface, zwp_tablet_manager_v2_interface.name) == 0) {
wl->tablet_manager = wl_registry_bind(registry, name,
&zwp_tablet_manager_v2_interface, 1);
} else if (strcmp(iface, zwp_linux_dmabuf_v1_interface.name) == 0 &&
version >= 3) {
wl->zwp_linux_dmabuf_v1 = wl_registry_bind(registry, name,
&zwp_linux_dmabuf_v1_interface, 3);
zwp_linux_dmabuf_v1_add_listener(wl->zwp_linux_dmabuf_v1,
&linux_dmabuf_v1_listener, wl);
} else if (strcmp(iface, zwp_relative_pointer_manager_v1_interface.name) == 0) {
wl->zwp_relative_pointer_manager_v1 = wl_registry_bind(registry, name,
&zwp_relative_pointer_manager_v1_interface, 1);
} else if (strcmp(iface, wl_drm_interface.name) == 0) {
wl->legacy_drm = wl_registry_bind(registry, name, &wl_drm_interface, 1);
wl_drm_add_listener(wl->legacy_drm, &legacy_drm_listener, wl);
}
}
static void registry_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// TODO
}
static const struct wl_registry_listener registry_listener = {
.global = registry_global,
.global_remove = registry_global_remove
};
/*
* Initializes the wayland backend. Opens a connection to a remote wayland
* compositor and creates surfaces for each output, then registers globals on
* the specified display.
*/
static bool backend_start(struct wlr_backend *backend) {
struct wlr_wl_backend *wl = get_wl_backend_from_backend(backend);
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wlr_log(WLR_INFO, "Initializating wayland backend");
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wl->started = true;
struct wlr_wl_seat *seat;
wl_list_for_each(seat, &wl->seats, link) {
if (seat->keyboard) {
create_wl_keyboard(seat);
}
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if (wl->tablet_manager) {
wl_add_tablet_seat(wl->tablet_manager, seat);
}
}
for (size_t i = 0; i < wl->requested_outputs; ++i) {
wlr_wl_output_create(&wl->backend);
}
return true;
}
static void backend_destroy(struct wlr_backend *backend) {
if (!backend) {
return;
}
struct wlr_wl_backend *wl = get_wl_backend_from_backend(backend);
struct wlr_wl_output *output, *tmp_output;
wl_list_for_each_safe(output, tmp_output, &wl->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
struct wlr_input_device *input_device, *tmp_input_device;
wl_list_for_each_safe(input_device, tmp_input_device, &wl->devices, link) {
wlr_input_device_destroy(input_device);
}
wlr_signal_emit_safe(&wl->backend.events.destroy, &wl->backend);
wl_list_remove(&wl->local_display_destroy.link);
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wl_event_source_remove(wl->remote_display_src);
wlr_renderer_destroy(wl->renderer);
wlr_allocator_destroy(wl->allocator);
wlr_drm_format_set_finish(&wl->linux_dmabuf_v1_formats);
struct wlr_wl_buffer *buffer, *tmp_buffer;
wl_list_for_each_safe(buffer, tmp_buffer, &wl->buffers, link) {
destroy_wl_buffer(buffer);
}
destroy_wl_seats(wl);
if (wl->zxdg_decoration_manager_v1) {
zxdg_decoration_manager_v1_destroy(wl->zxdg_decoration_manager_v1);
}
if (wl->zwp_pointer_gestures_v1) {
zwp_pointer_gestures_v1_destroy(wl->zwp_pointer_gestures_v1);
}
if (wl->presentation) {
wp_presentation_destroy(wl->presentation);
}
if (wl->zwp_linux_dmabuf_v1) {
zwp_linux_dmabuf_v1_destroy(wl->zwp_linux_dmabuf_v1);
}
if (wl->zwp_relative_pointer_manager_v1) {
zwp_relative_pointer_manager_v1_destroy(wl->zwp_relative_pointer_manager_v1);
}
free(wl->drm_render_name);
xdg_wm_base_destroy(wl->xdg_wm_base);
wl_compositor_destroy(wl->compositor);
wl_registry_destroy(wl->registry);
wl_display_disconnect(wl->remote_display);
free(wl);
}
static struct wlr_renderer *backend_get_renderer(struct wlr_backend *backend) {
struct wlr_wl_backend *wl = get_wl_backend_from_backend(backend);
return wl->renderer;
}
static struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_renderer = backend_get_renderer,
};
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bool wlr_backend_is_wl(struct wlr_backend *b) {
return b->impl == &backend_impl;
}
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static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_wl_backend *wl =
wl_container_of(listener, wl, local_display_destroy);
backend_destroy(&wl->backend);
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}
struct wlr_backend *wlr_wl_backend_create(struct wl_display *display,
const char *remote) {
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wlr_log(WLR_INFO, "Creating wayland backend");
struct wlr_wl_backend *wl = calloc(1, sizeof(*wl));
if (!wl) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
wlr_backend_init(&wl->backend, &backend_impl);
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wl->local_display = display;
wl_list_init(&wl->devices);
wl_list_init(&wl->outputs);
wl_list_init(&wl->seats);
wl_list_init(&wl->buffers);
wl->remote_display = wl_display_connect(remote);
if (!wl->remote_display) {
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wlr_log_errno(WLR_ERROR, "Could not connect to remote display");
goto error_wl;
}
wl->registry = wl_display_get_registry(wl->remote_display);
if (!wl->registry) {
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wlr_log_errno(WLR_ERROR, "Could not obtain reference to remote registry");
goto error_display;
}
wl_registry_add_listener(wl->registry, &registry_listener, wl);
wl_display_roundtrip(wl->remote_display); // get globals
wl_display_roundtrip(wl->remote_display); // get linux-dmabuf formats
if (!wl->compositor) {
wlr_log(WLR_ERROR,
"Remote Wayland compositor does not support wl_compositor");
goto error_registry;
}
if (!wl->xdg_wm_base) {
wlr_log(WLR_ERROR,
"Remote Wayland compositor does not support xdg-shell");
goto error_registry;
}
if (!wl->drm_render_name) {
wlr_log(WLR_ERROR, "Failed to get DRM render node from remote Wayland "
"compositor wl_drm interface");
goto error_registry;
}
struct wl_event_loop *loop = wl_display_get_event_loop(wl->local_display);
int fd = wl_display_get_fd(wl->remote_display);
wl->remote_display_src = wl_event_loop_add_fd(loop, fd, WL_EVENT_READABLE,
dispatch_events, wl);
if (!wl->remote_display_src) {
wlr_log(WLR_ERROR, "Failed to create event source");
goto error_registry;
}
wl_event_source_check(wl->remote_display_src);
wlr_log(WLR_DEBUG, "Opening DRM render node %s", wl->drm_render_name);
int drm_fd = open(wl->drm_render_name, O_RDWR | O_NONBLOCK | O_CLOEXEC);
if (drm_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open DRM render node %s",
wl->drm_render_name);
goto error_registry;
}
struct wlr_gbm_allocator *gbm_alloc = wlr_gbm_allocator_create(drm_fd);
if (gbm_alloc == NULL) {
wlr_log(WLR_ERROR, "Failed to create GBM allocator");
close(drm_fd);
goto error_registry;
}
wl->allocator = &gbm_alloc->base;
wl->renderer = wlr_renderer_autocreate(EGL_PLATFORM_GBM_KHR,
gbm_alloc->gbm_device);
if (wl->renderer == NULL) {
wlr_log(WLR_ERROR, "Failed to create renderer");
goto error_registry;
}
uint32_t fmt = DRM_FORMAT_ARGB8888;
const struct wlr_drm_format *remote_format =
wlr_drm_format_set_get(&wl->linux_dmabuf_v1_formats, fmt);
if (remote_format == NULL) {
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wlr_log(WLR_ERROR, "Remote compositor doesn't support format "
"0x%"PRIX32" via linux-dmabuf-unstable-v1", fmt);
goto error_event;
}
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const struct wlr_drm_format_set *render_formats =
wlr_renderer_get_dmabuf_render_formats(wl->renderer);
if (render_formats == NULL) {
wlr_log(WLR_ERROR, "Failed to get available DMA-BUF formats from renderer");
return false;
}
const struct wlr_drm_format *render_format =
wlr_drm_format_set_get(render_formats, fmt);
if (render_format == NULL) {
wlr_log(WLR_ERROR, "Renderer doesn't support DRM format 0x%"PRIX32, fmt);
return false;
}
wl->format = wlr_drm_format_intersect(remote_format, render_format);
if (wl->format == NULL) {
wlr_log(WLR_ERROR, "Failed to intersect remote and render modifiers "
"for format 0x%"PRIX32, fmt);
return false;
}
wl->local_display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &wl->local_display_destroy);
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return &wl->backend;
error_event:
wl_event_source_remove(wl->remote_display_src);
error_registry:
free(wl->drm_render_name);
if (wl->compositor) {
wl_compositor_destroy(wl->compositor);
}
if (wl->xdg_wm_base) {
xdg_wm_base_destroy(wl->xdg_wm_base);
}
wl_registry_destroy(wl->registry);
error_display:
wl_display_disconnect(wl->remote_display);
error_wl:
free(wl);
return NULL;
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}
struct wl_display *wlr_wl_backend_get_remote_display(struct wlr_backend *backend) {
struct wlr_wl_backend *wl = get_wl_backend_from_backend(backend);
return wl->remote_display;
}