forked from 12to11/12to11
Check in new files for explicit synchronization
* explicit_synchronization.c: * linux-explicit-synchronization-unstable-v1.xml: New files.
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oldosfan
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2 changed files with 746 additions and 0 deletions
490
explicit_synchronization.c
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490
explicit_synchronization.c
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/* Wayland compositor running on top of an X server.
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Copyright (C) 2022 to various contributors.
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This file is part of 12to11.
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12to11 is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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12to11 is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with 12to11. If not, see <https://www.gnu.org/licenses/>. */
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#include <string.h>
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#include "compositor.h"
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#include "linux-explicit-synchronization-unstable-v1.h"
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struct _Synchronization
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{
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/* The surface destroy listener. */
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DestroyCallback *destroy_listener;
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/* The surface. */
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Surface *surface;
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/* The file descriptor of any pending acquire fence. */
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int acquire_fence;
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/* Any associated release object. */
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SyncRelease *release;
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/* The associated resource. */
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struct wl_resource *resource;
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};
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struct _SyncRelease
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{
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/* The associated surface. */
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Surface *surface;
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/* The associated synchronization. */
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Synchronization *synchronization;
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/* The associated resource. */
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struct wl_resource *resource;
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};
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/* The global zwp_linux_explicit_synchronization_v1 object. */
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static struct wl_global *explicit_sync_global;
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static void
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HandleReleaseDestroy (struct wl_resource *resource)
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{
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SyncRelease *release;
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release = wl_resource_get_user_data (resource);
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/* If release is attached to a surface, remove it from the
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surface. */
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if (release->surface)
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release->surface->release = NULL;
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/* Do the same for the synchronization object. */
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if (release->synchronization)
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release->synchronization->release = NULL;
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/* Free the release object. */
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XLFree (release);
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}
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static void
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DestroySynchronization (struct wl_client *client, struct wl_resource *resource)
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{
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wl_resource_destroy (resource);
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}
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static void
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SetAcquireFence (struct wl_client *client, struct wl_resource *resource,
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int32_t fd)
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{
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Synchronization *synchronization;
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synchronization = wl_resource_get_user_data (resource);
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#define NoSurface ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_NO_SURFACE
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/* If the surface was destroyed, raise such an error. */
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if (!synchronization->surface)
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{
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wl_resource_post_error (resource, NoSurface,
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"the surface associated with this"
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" resource was destroyed");
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goto error;
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}
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#undef NoSurface
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#define DuplicateFence \
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ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_DUPLICATE_FENCE
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/* If a fence was already attached, raise that as an errore. */
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if (synchronization->acquire_fence != -1)
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{
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wl_resource_post_error (resource, DuplicateFence,
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"another fence has already been attached"
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" during this commit cycle");
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goto error;
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}
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#undef DuplicateFence
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/* Set the file descriptor and return. */
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synchronization->acquire_fence = fd;
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return;
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error:
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close (fd);
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}
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static void
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GetRelease (struct wl_client *client, struct wl_resource *resource,
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uint32_t id)
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{
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Synchronization *synchronization;
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SyncRelease *release;
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/* The release lifecycle is somewhat like this:
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First, it starts out as the `release' field of a Synchronization
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resource. When the synchronization is committed, it is moved to
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the release field of the surface, and it is detatched from both
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once release events are sent. */
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synchronization = wl_resource_get_user_data (resource);
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#define DuplicateRelease \
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ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_DUPLICATE_RELEASE
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if (synchronization->release)
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{
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/* Uncommitted release already exists. Post an error. */
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wl_resource_post_error (resource, DuplicateRelease,
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"another release has already been acquired"
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" during this commit cycle");
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return;
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}
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#undef DuplicateRelease
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release = XLSafeMalloc (sizeof *release);
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if (!release)
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{
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wl_resource_post_no_memory (resource);
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return;
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}
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memset (release, 0, sizeof *release);
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release->resource
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= wl_resource_create (client,
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&zwp_linux_buffer_release_v1_interface,
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wl_resource_get_version (resource),
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id);
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if (!release->resource)
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{
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wl_resource_post_no_memory (resource);
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return;
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}
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/* Attach the release. */
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release->synchronization = synchronization;
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synchronization->release = release;
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/* Set the resource implementation. */
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wl_resource_set_implementation (release->resource,
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NULL, release,
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HandleReleaseDestroy);
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}
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static void
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HandleSurfaceDestroy (void *data)
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{
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Synchronization *synchronization;
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synchronization = data;
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/* The surface was destroyed. Mark the object as invalid. */
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synchronization->surface = NULL;
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synchronization->destroy_listener = NULL;
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}
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static void
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HandleSurfaceCommit (Synchronization *synchronization, Surface *surface)
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{
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#define NoBuffer ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_NO_BUFFER
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if (synchronization->acquire_fence != -1)
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{
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if (!(surface->pending_state.pending & PendingBuffer
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&& surface->pending_state.buffer))
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{
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/* If no buffer was attached, report an error. */
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wl_resource_post_error (synchronization->resource,
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NoBuffer, "no buffer attached"
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" but acquire fence provided");
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close (synchronization->acquire_fence);
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synchronization->acquire_fence = -1;
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return;
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}
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if (surface->acquire_fence != -1)
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close (surface->acquire_fence);
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surface->acquire_fence = synchronization->acquire_fence;
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synchronization->acquire_fence = -1;
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}
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/* Move the release callback to the surface. Assume one does
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not already exist. */
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XLAssert (surface->release == NULL);
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/* surface->release can still end up NULL if no release was
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attached. */
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surface->release = synchronization->release;
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if (surface->release)
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{
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/* Clear these fields, to detach the release from the
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synchronization. */
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surface->release->synchronization = NULL;
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synchronization->release = NULL;
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/* And set this field to attach the release to the
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surface. */
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surface->release->surface = surface;
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if (surface->release
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&& !(surface->pending_state.pending & PendingBuffer
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&& surface->pending_state.buffer))
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wl_resource_post_error (synchronization->resource,
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NoBuffer, "no buffer attached"
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" but release provided");
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}
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#undef NoBuffer
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}
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static void
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HandleSynchronizationDestroy (struct wl_resource *resource)
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{
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Synchronization *synchronization;
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/* Free the synchronization as it has been destroyed. */
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synchronization = wl_resource_get_user_data (resource);
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if (synchronization->destroy_listener)
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XLSurfaceCancelRunOnFree (synchronization->destroy_listener);
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if (synchronization->surface)
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/* Also detach it from the surface. */
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synchronization->surface->synchronization = NULL;
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/* Detach any attached release callback. */
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if (synchronization->release)
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wl_resource_destroy (synchronization->release->resource);
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/* If a fence happens to still be attached, close it. */
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if (synchronization->acquire_fence != -1)
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close (synchronization->acquire_fence);
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XLFree (synchronization);
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}
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static struct zwp_linux_surface_synchronization_v1_interface synchronization_impl =
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{
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.destroy = DestroySynchronization,
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.set_acquire_fence = SetAcquireFence,
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.get_release = GetRelease,
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};
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static void
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Destroy (struct wl_client *client, struct wl_resource *resource)
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{
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wl_resource_destroy (resource);
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}
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static void
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GetSynchronization (struct wl_client *client, struct wl_resource *resource,
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uint32_t id, struct wl_resource *surface_resource)
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{
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Synchronization *synchronization;
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Surface *surface;
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surface = wl_resource_get_user_data (surface_resource);
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#define SynchronizationAlreadyExists \
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ZWP_LINUX_EXPLICIT_SYNCHRONIZATION_V1_ERROR_SYNCHRONIZATION_EXISTS
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if (surface->synchronization)
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{
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/* Don't let clients create more synchronization objects if one
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already exists. */
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wl_resource_post_error (resource, SynchronizationAlreadyExists,
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"synchronization object already exists");
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return;
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}
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#undef SynchronizationAlreadyExists
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/* Allocate the synchronization object. */
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synchronization = XLSafeMalloc (sizeof *synchronization);
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if (!synchronization)
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{
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wl_resource_post_no_memory (resource);
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return;
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}
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memset (synchronization, 0, sizeof *synchronization);
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synchronization->resource
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= wl_resource_create (client,
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&zwp_linux_surface_synchronization_v1_interface,
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wl_resource_get_version (resource), id);
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if (!synchronization->resource)
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{
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XLFree (synchronization);
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wl_resource_post_no_memory (resource);
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return;
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}
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/* Now, attach the synchronization object to the surface. */
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surface->synchronization = synchronization;
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/* And attach a destroy listener. */
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synchronization->destroy_listener
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= XLSurfaceRunOnFree (surface, HandleSurfaceDestroy,
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synchronization);
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/* And attach the surface to the synchronization. */
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synchronization->surface = surface;
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/* Set the implementation. */
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wl_resource_set_implementation (synchronization->resource,
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&synchronization_impl,
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synchronization,
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HandleSynchronizationDestroy);
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/* Clear initial values. */
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synchronization->acquire_fence = -1;
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}
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static struct zwp_linux_explicit_synchronization_v1_interface explicit_sync_impl =
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{
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.destroy = Destroy,
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.get_synchronization = GetSynchronization,
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};
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static void
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HandleBind (struct wl_client *client, void *data, uint32_t version,
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uint32_t id)
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{
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struct wl_resource *resource;
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resource
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= wl_resource_create (client,
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&zwp_linux_explicit_synchronization_v1_interface,
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version, id);
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if (!resource)
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{
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wl_client_post_no_memory (client);
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return;
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}
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wl_resource_set_implementation (resource, &explicit_sync_impl,
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NULL, NULL);
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}
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void
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XLDestroyRelease (SyncRelease *release)
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{
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/* Destroying the resoruce will cause the release to be freed. */
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wl_resource_destroy (release->resource);
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}
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void
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XLSyncRelease (SyncRelease *release)
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{
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Bool error;
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int fd;
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/* Optimization ideas. Every time a buffer is attached with a
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release object, create new finish_fence for the buffer, that is
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signalled whenever the contents are drawn. Then, just use that
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fence here instead. */
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error = False;
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fd = RenderGetFinishFence (&error);
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if (error)
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#define InvalidFence ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_INVALID_FENCE
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wl_resource_post_error (release->resource, InvalidFence,
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"server failed to create finish fence");
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#undef InvalidFence
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else
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{
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/* Post a fenced release with the fence. */
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zwp_linux_buffer_release_v1_send_fenced_release (release->resource,
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fd);
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/* Close the file descriptor. */
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close (fd);
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}
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/* Destroy the sync object. */
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wl_resource_destroy (release->resource);
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}
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void
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XLSyncCommit (Synchronization *synchronization)
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{
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HandleSurfaceCommit (synchronization, synchronization->surface);
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}
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void
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XLWaitFence (Surface *surface)
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{
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RenderFence fence;
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Bool error;
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if (surface->acquire_fence == -1)
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return;
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error = False;
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/* This is expected to close the file descriptor. */
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fence = RenderImportFdFence (surface->acquire_fence, &error);
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if (error)
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{
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#define InvalidFence ZWP_LINUX_SURFACE_SYNCHRONIZATION_V1_ERROR_INVALID_FENCE
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/* Importing the fence failed; signal an error to the
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server. */
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wl_resource_post_error (surface->resource,
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InvalidFence, "the specified sync"
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" fence could not be imported");
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#undef InvalidFence
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/* Try closing the file descriptor as well. */
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close (surface->acquire_fence);
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surface->acquire_fence = -1;
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return;
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}
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surface->acquire_fence = -1;
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/* Wait for the fence to be triggered. */
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RenderWaitFence (fence);
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/* Delete the fence. */
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RenderDeleteFence (fence);
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}
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void
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XLInitExplicitSynchronization (void)
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{
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/* If the renderer does not support explicit synchronization,
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return. */
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if (!(renderer_flags & SupportsExplicitSync))
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return;
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explicit_sync_global
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= wl_global_create (compositor.wl_display,
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&zwp_linux_explicit_synchronization_v1_interface,
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2, NULL, HandleBind);
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}
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256
linux-explicit-synchronization-unstable-v1.xml
Normal file
256
linux-explicit-synchronization-unstable-v1.xml
Normal file
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@ -0,0 +1,256 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="zwp_linux_explicit_synchronization_unstable_v1">
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<copyright>
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Copyright 2016 The Chromium Authors.
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Copyright 2017 Intel Corporation
|
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Copyright 2018 Collabora, Ltd
|
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|
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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.
|
||||
</copyright>
|
||||
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<interface name="zwp_linux_explicit_synchronization_v1" version="2">
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<description summary="protocol for providing explicit synchronization">
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This global is a factory interface, allowing clients to request
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explicit synchronization for buffers on a per-surface basis.
|
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See zwp_linux_surface_synchronization_v1 for more information.
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|
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This interface is derived from Chromium's
|
||||
zcr_linux_explicit_synchronization_v1.
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||||
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Warning! The protocol described in this file is experimental and
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||||
backward incompatible changes may be made. Backward compatible changes
|
||||
may be added together with the corresponding interface version bump.
|
||||
Backward incompatible changes are done by bumping the version number in
|
||||
the protocol and interface names and resetting the interface version.
|
||||
Once the protocol is to be declared stable, the 'z' prefix and the
|
||||
version number in the protocol and interface names are removed and the
|
||||
interface version number is reset.
|
||||
</description>
|
||||
|
||||
<request name="destroy" type="destructor">
|
||||
<description summary="destroy explicit synchronization factory object">
|
||||
Destroy this explicit synchronization factory object. Other objects,
|
||||
including zwp_linux_surface_synchronization_v1 objects created by this
|
||||
factory, shall not be affected by this request.
|
||||
</description>
|
||||
</request>
|
||||
|
||||
<enum name="error">
|
||||
<entry name="synchronization_exists" value="0"
|
||||
summary="the surface already has a synchronization object associated"/>
|
||||
</enum>
|
||||
|
||||
<request name="get_synchronization">
|
||||
<description summary="extend surface interface for explicit synchronization">
|
||||
Instantiate an interface extension for the given wl_surface to provide
|
||||
explicit synchronization.
|
||||
|
||||
If the given wl_surface already has an explicit synchronization object
|
||||
associated, the synchronization_exists protocol error is raised.
|
||||
|
||||
Graphics APIs, like EGL or Vulkan, that manage the buffer queue and
|
||||
commits of a wl_surface themselves, are likely to be using this
|
||||
extension internally. If a client is using such an API for a
|
||||
wl_surface, it should not directly use this extension on that surface,
|
||||
to avoid raising a synchronization_exists protocol error.
|
||||
</description>
|
||||
|
||||
<arg name="id" type="new_id"
|
||||
interface="zwp_linux_surface_synchronization_v1"
|
||||
summary="the new synchronization interface id"/>
|
||||
<arg name="surface" type="object" interface="wl_surface"
|
||||
summary="the surface"/>
|
||||
</request>
|
||||
</interface>
|
||||
|
||||
<interface name="zwp_linux_surface_synchronization_v1" version="2">
|
||||
<description summary="per-surface explicit synchronization support">
|
||||
This object implements per-surface explicit synchronization.
|
||||
|
||||
Synchronization refers to co-ordination of pipelined operations performed
|
||||
on buffers. Most GPU clients will schedule an asynchronous operation to
|
||||
render to the buffer, then immediately send the buffer to the compositor
|
||||
to be attached to a surface.
|
||||
|
||||
In implicit synchronization, ensuring that the rendering operation is
|
||||
complete before the compositor displays the buffer is an implementation
|
||||
detail handled by either the kernel or userspace graphics driver.
|
||||
|
||||
By contrast, in explicit synchronization, dma_fence objects mark when the
|
||||
asynchronous operations are complete. When submitting a buffer, the
|
||||
client provides an acquire fence which will be waited on before the
|
||||
compositor accesses the buffer. The Wayland server, through a
|
||||
zwp_linux_buffer_release_v1 object, will inform the client with an event
|
||||
which may be accompanied by a release fence, when the compositor will no
|
||||
longer access the buffer contents due to the specific commit that
|
||||
requested the release event.
|
||||
|
||||
Each surface can be associated with only one object of this interface at
|
||||
any time.
|
||||
|
||||
In version 1 of this interface, explicit synchronization is only
|
||||
guaranteed to be supported for buffers created with any version of the
|
||||
wp_linux_dmabuf buffer factory. Version 2 additionally guarantees
|
||||
explicit synchronization support for opaque EGL buffers, which is a type
|
||||
of platform specific buffers described in the EGL_WL_bind_wayland_display
|
||||
extension. Compositors are free to support explicit synchronization for
|
||||
additional buffer types.
|
||||
</description>
|
||||
|
||||
<request name="destroy" type="destructor">
|
||||
<description summary="destroy synchronization object">
|
||||
Destroy this explicit synchronization object.
|
||||
|
||||
Any fence set by this object with set_acquire_fence since the last
|
||||
commit will be discarded by the server. Any fences set by this object
|
||||
before the last commit are not affected.
|
||||
|
||||
zwp_linux_buffer_release_v1 objects created by this object are not
|
||||
affected by this request.
|
||||
</description>
|
||||
</request>
|
||||
|
||||
<enum name="error">
|
||||
<entry name="invalid_fence" value="0"
|
||||
summary="the fence specified by the client could not be imported"/>
|
||||
<entry name="duplicate_fence" value="1"
|
||||
summary="multiple fences added for a single surface commit"/>
|
||||
<entry name="duplicate_release" value="2"
|
||||
summary="multiple releases added for a single surface commit"/>
|
||||
<entry name="no_surface" value="3"
|
||||
summary="the associated wl_surface was destroyed"/>
|
||||
<entry name="unsupported_buffer" value="4"
|
||||
summary="the buffer does not support explicit synchronization"/>
|
||||
<entry name="no_buffer" value="5"
|
||||
summary="no buffer was attached"/>
|
||||
</enum>
|
||||
|
||||
<request name="set_acquire_fence">
|
||||
<description summary="set the acquire fence">
|
||||
Set the acquire fence that must be signaled before the compositor
|
||||
may sample from the buffer attached with wl_surface.attach. The fence
|
||||
is a dma_fence kernel object.
|
||||
|
||||
The acquire fence is double-buffered state, and will be applied on the
|
||||
next wl_surface.commit request for the associated surface. Thus, it
|
||||
applies only to the buffer that is attached to the surface at commit
|
||||
time.
|
||||
|
||||
If the provided fd is not a valid dma_fence fd, then an INVALID_FENCE
|
||||
error is raised.
|
||||
|
||||
If a fence has already been attached during the same commit cycle, a
|
||||
DUPLICATE_FENCE error is raised.
|
||||
|
||||
If the associated wl_surface was destroyed, a NO_SURFACE error is
|
||||
raised.
|
||||
|
||||
If at surface commit time the attached buffer does not support explicit
|
||||
synchronization, an UNSUPPORTED_BUFFER error is raised.
|
||||
|
||||
If at surface commit time there is no buffer attached, a NO_BUFFER
|
||||
error is raised.
|
||||
</description>
|
||||
<arg name="fd" type="fd" summary="acquire fence fd"/>
|
||||
</request>
|
||||
|
||||
<request name="get_release">
|
||||
<description summary="release fence for last-attached buffer">
|
||||
Create a listener for the release of the buffer attached by the
|
||||
client with wl_surface.attach. See zwp_linux_buffer_release_v1
|
||||
documentation for more information.
|
||||
|
||||
The release object is double-buffered state, and will be associated
|
||||
with the buffer that is attached to the surface at wl_surface.commit
|
||||
time.
|
||||
|
||||
If a zwp_linux_buffer_release_v1 object has already been requested for
|
||||
the surface in the same commit cycle, a DUPLICATE_RELEASE error is
|
||||
raised.
|
||||
|
||||
If the associated wl_surface was destroyed, a NO_SURFACE error
|
||||
is raised.
|
||||
|
||||
If at surface commit time there is no buffer attached, a NO_BUFFER
|
||||
error is raised.
|
||||
</description>
|
||||
<arg name="release" type="new_id" interface="zwp_linux_buffer_release_v1"
|
||||
summary="new zwp_linux_buffer_release_v1 object"/>
|
||||
</request>
|
||||
</interface>
|
||||
|
||||
<interface name="zwp_linux_buffer_release_v1" version="1">
|
||||
<description summary="buffer release explicit synchronization">
|
||||
This object is instantiated in response to a
|
||||
zwp_linux_surface_synchronization_v1.get_release request.
|
||||
|
||||
It provides an alternative to wl_buffer.release events, providing a
|
||||
unique release from a single wl_surface.commit request. The release event
|
||||
also supports explicit synchronization, providing a fence FD for the
|
||||
client to synchronize against.
|
||||
|
||||
Exactly one event, either a fenced_release or an immediate_release, will
|
||||
be emitted for the wl_surface.commit request. The compositor can choose
|
||||
release by release which event it uses.
|
||||
|
||||
This event does not replace wl_buffer.release events; servers are still
|
||||
required to send those events.
|
||||
|
||||
Once a buffer release object has delivered a 'fenced_release' or an
|
||||
'immediate_release' event it is automatically destroyed.
|
||||
</description>
|
||||
|
||||
<event name="fenced_release" type="destructor">
|
||||
<description summary="release buffer with fence">
|
||||
Sent when the compositor has finalised its usage of the associated
|
||||
buffer for the relevant commit, providing a dma_fence which will be
|
||||
signaled when all operations by the compositor on that buffer for that
|
||||
commit have finished.
|
||||
|
||||
Once the fence has signaled, and assuming the associated buffer is not
|
||||
pending release from other wl_surface.commit requests, no additional
|
||||
explicit or implicit synchronization is required to safely reuse or
|
||||
destroy the buffer.
|
||||
|
||||
This event destroys the zwp_linux_buffer_release_v1 object.
|
||||
</description>
|
||||
<arg name="fence" type="fd" summary="fence for last operation on buffer"/>
|
||||
</event>
|
||||
|
||||
<event name="immediate_release" type="destructor">
|
||||
<description summary="release buffer immediately">
|
||||
Sent when the compositor has finalised its usage of the associated
|
||||
buffer for the relevant commit, and either performed no operations
|
||||
using it, or has a guarantee that all its operations on that buffer for
|
||||
that commit have finished.
|
||||
|
||||
Once this event is received, and assuming the associated buffer is not
|
||||
pending release from other wl_surface.commit requests, no additional
|
||||
explicit or implicit synchronization is required to safely reuse or
|
||||
destroy the buffer.
|
||||
|
||||
This event destroys the zwp_linux_buffer_release_v1 object.
|
||||
</description>
|
||||
</event>
|
||||
</interface>
|
||||
|
||||
</protocol>
|
||||
Loading…
Add table
Reference in a new issue