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weston/libweston/linux-explicit-synchronizat...

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/*
* Copyright © 2018 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <assert.h>
#include <inttypes.h>
#include <libweston/libweston.h>
#include "linux-explicit-synchronization.h"
#include "linux-explicit-synchronization-unstable-v1-server-protocol.h"
#include "linux-sync-file.h"
#include "shared/fd-util.h"
static void
destroy_linux_buffer_release(struct wl_resource *resource)
{
struct weston_buffer_release *buffer_release =
wl_resource_get_user_data(resource);
fd_clear(&buffer_release->fence_fd);
free(buffer_release);
}
static void
destroy_linux_surface_synchronization(struct wl_resource *resource)
{
struct weston_surface *surface =
wl_resource_get_user_data(resource);
if (surface) {
fd_clear(&surface->pending.acquire_fence_fd);
surface->synchronization_resource = NULL;
}
}
static void
linux_surface_synchronization_destroy(struct wl_client *client,
struct wl_resource *resource)
{
wl_resource_destroy(resource);
}
static void
linux_surface_synchronization_set_acquire_fence(struct wl_client *client,
struct wl_resource *resource,
int32_t fd)
{
struct weston_surface *surface = wl_resource_get_user_data(resource);
if (!surface) {
wl_resource_post_error(
resource,
ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_NO_SURFACE,
"surface no longer exists");
goto err;
}
if (!linux_sync_file_is_valid(fd)) {
wl_resource_post_error(
resource,
ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_INVALID_FENCE,
"invalid fence fd");
goto err;
}
if (surface->pending.acquire_fence_fd != -1) {
wl_resource_post_error(
resource,
ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_DUPLICATE_FENCE,
"already have a fence fd");
goto err;
}
fd_update(&surface->pending.acquire_fence_fd, fd);
return;
err:
close(fd);
}
static void
linux_surface_synchronization_get_release(struct wl_client *client,
struct wl_resource *resource,
uint32_t id)
{
struct weston_surface *surface =
wl_resource_get_user_data(resource);
struct weston_buffer_release *buffer_release;
if (!surface) {
wl_resource_post_error(
resource,
ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_NO_SURFACE,
"surface no longer exists");
return;
}
if (surface->pending.buffer_release_ref.buffer_release) {
wl_resource_post_error(
resource,
ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_DUPLICATE_RELEASE,
"already has a buffer release");
return;
}
buffer_release = zalloc(sizeof *buffer_release);
if (buffer_release == NULL)
goto err_alloc;
buffer_release->fence_fd = -1;
buffer_release->resource =
wl_resource_create(client,
&zwp_linux_buffer_release_v1_interface,
wl_resource_get_version(resource), id);
if (!buffer_release->resource)
goto err_create;
wl_resource_set_implementation(buffer_release->resource, NULL,
buffer_release,
destroy_linux_buffer_release);
weston_buffer_release_reference(&surface->pending.buffer_release_ref,
buffer_release);
return;
err_create:
free(buffer_release);
err_alloc:
wl_client_post_no_memory(client);
}
const struct zwp_linux_surface_synchronization_v1_interface
linux_surface_synchronization_implementation = {
linux_surface_synchronization_destroy,
linux_surface_synchronization_set_acquire_fence,
linux_surface_synchronization_get_release,
};
static void
linux_explicit_synchronization_destroy(struct wl_client *client,
struct wl_resource *resource)
{
wl_resource_destroy(resource);
}
static void
linux_explicit_synchronization_get_synchronization(struct wl_client *client,
struct wl_resource *resource,
uint32_t id,
struct wl_resource *surface_resource)
{
struct weston_surface *surface =
wl_resource_get_user_data(surface_resource);
if (surface->synchronization_resource) {
wl_resource_post_error(
resource,
ZWP_LINUX_EXPLICIT_SYNCHRONIZATION_V1_ERROR_SYNCHRONIZATION_EXISTS,
"wl_surface@%"PRIu32" already has a synchronization object",
wl_resource_get_id(surface_resource));
return;
}
surface->synchronization_resource =
wl_resource_create(client,
&zwp_linux_surface_synchronization_v1_interface,
wl_resource_get_version(resource), id);
if (!surface->synchronization_resource) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(surface->synchronization_resource,
&linux_surface_synchronization_implementation,
surface,
destroy_linux_surface_synchronization);
}
static const struct zwp_linux_explicit_synchronization_v1_interface
linux_explicit_synchronization_implementation = {
linux_explicit_synchronization_destroy,
linux_explicit_synchronization_get_synchronization
};
static void
bind_linux_explicit_synchronization(struct wl_client *client,
void *data, uint32_t version,
uint32_t id)
{
struct weston_compositor *compositor = data;
struct wl_resource *resource;
resource = wl_resource_create(client,
&zwp_linux_explicit_synchronization_v1_interface,
version, id);
if (resource == NULL) {
wl_client_post_no_memory(client);
return;
}
wl_resource_set_implementation(resource,
&linux_explicit_synchronization_implementation,
compositor, NULL);
}
/** Advertise linux_explicit_synchronization support
*
* Calling this initializes the zwp_linux_explicit_synchronization_v1
* protocol support, so that the interface will be advertised to clients.
* Essentially it creates a global. Do not call this function multiple times
* in the compositor's lifetime. There is no way to deinit explicitly, globals
* will be reaped when the wl_display gets destroyed.
*
* \param compositor The compositor to init for.
* \return Zero on success, -1 on failure.
*/
WL_EXPORT int
linux_explicit_synchronization_setup(struct weston_compositor *compositor)
{
/* TODO: Update to minor version 2 when the next version of
* wayland-protocols that contains it is released. */
if (!wl_global_create(compositor->wl_display,
&zwp_linux_explicit_synchronization_v1_interface,
1, compositor,
bind_linux_explicit_synchronization))
return -1;
return 0;
}
/** Resolve an internal compositor error by disconnecting the client.
*
* This function is used in cases when explicit synchronization
* turns out to be unusable and there is no fallback path.
*
* It is possible the fault is caused by a compositor bug, the underlying
* graphics stack bug or normal behaviour, or perhaps a client mistake.
* In any case, the options are to either composite garbage or nothing,
* or disconnect the client. This is a helper function for the latter.
*
* The error is sent as an INVALID_OBJECT error on the client's wl_display.
*
* \param resource The explicit synchronization related resource that is unusable.
* \param msg A custom error message attached to the protocol error.
*/
WL_EXPORT void
linux_explicit_synchronization_send_server_error(struct wl_resource *resource,
const char *msg)
{
uint32_t id = wl_resource_get_id(resource);
const char *class = wl_resource_get_class(resource);
struct wl_client *client = wl_resource_get_client(resource);
struct wl_resource *display_resource = wl_client_get_object(client, 1);
assert(display_resource);
wl_resource_post_error(display_resource,
WL_DISPLAY_ERROR_INVALID_OBJECT,
"linux_explicit_synchronization server error "
"with %s@%"PRIu32": %s",
class, id, msg);
}