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xwayland/window-buffers: Do not always set syncpnts

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The function xwl_window_swap_pixmap() can be called from two places,
either from xwl_window_attach_buffer() or from damage_report().

When called from xwl_window_attach_buffer(), the new buffer is attached
and the surface committed.

However, when called from damage_report(), a new buffer might not be
attached before the surface is committed.

That's fine with implicit synchronization, but if we use explicit
synchronization, committing a surface without a new buffer attached but
with a release timeline point set is a protocol error:

| If at surface commit time there is a pending release timeline point
| set but no pending buffer attached, a no_buffer error is raised.

To avoid such an issue, add a new parameter to xwl_window_swap_pixmap()
to hint whether it should set the synchronization points, and have the
synchronization points set only from xwl_window_attach_buffer().

v2: Rename param to handle_sync (Michel)

Suggested-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/1571>
(cherry picked from commit aab01c7391)
This commit is contained in:
Olivier Fourdan 2024-07-02 12:36:01 +02:00 • committed by Alan Coopersmith
parent 379b24a7c9
commit 6e6707ea88
3 changed files with 5 additions and 5 deletions
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4
hw/xwayland/xwayland-window-buffers.c
View file

@ -350,7 +350,7 @@ xwl_window_realloc_pixmap(struct xwl_window *xwl_window)
}
PixmapPtr
xwl_window_swap_pixmap(struct xwl_window *xwl_window)
xwl_window_swap_pixmap(struct xwl_window *xwl_window, Bool handle_sync)
{
struct xwl_screen *xwl_screen = xwl_window->xwl_screen;
WindowPtr surface_window = xwl_window->surface_window;
@ -409,7 +409,7 @@ xwl_window_swap_pixmap(struct xwl_window *xwl_window)
xwl_window_buffer->refcnt++;
#ifdef XWL_HAS_GLAMOR
if (!xwl_glamor_supports_implicit_sync(xwl_screen)) {
if (handle_sync && !xwl_glamor_supports_implicit_sync(xwl_screen)) {
if (xwl_screen->explicit_sync && xwl_glamor_gbm_set_syncpts(xwl_window, window_pixmap)) {
implicit_sync = FALSE;
/* wait until the release fence is available before re-using this buffer */

2
hw/xwayland/xwayland-window-buffers.h
View file

@ -36,6 +36,6 @@ void xwl_window_buffer_release(struct xwl_window_buffer *xwl_window_buffer);
void xwl_window_buffers_init(struct xwl_window *xwl_window);
void xwl_window_buffers_dispose(struct xwl_window *xwl_window);
void xwl_window_realloc_pixmap(struct xwl_window *xwl_window);
PixmapPtr xwl_window_swap_pixmap(struct xwl_window *xwl_window);
PixmapPtr xwl_window_swap_pixmap(struct xwl_window *xwl_window, Bool handle_sync);
#endif /* XWAYLAND_WINDOW_BUFFERS_H */

4
hw/xwayland/xwayland-window.c
View file

@ -316,7 +316,7 @@ damage_report(DamagePtr pDamage, RegionPtr pRegion, void *data)
window_pixmap = xwl_screen->screen->GetWindowPixmap(xwl_window->surface_window);
if (xwl_is_client_pixmap(window_pixmap))
xwl_screen->screen->DestroyPixmap(xwl_window_swap_pixmap(xwl_window));
xwl_screen->screen->DestroyPixmap(xwl_window_swap_pixmap(xwl_window, FALSE));
}
static void
@ -1953,7 +1953,7 @@ xwl_window_attach_buffer(struct xwl_window *xwl_window)
PixmapPtr pixmap;
int i;
pixmap = xwl_window_swap_pixmap(xwl_window);
pixmap = xwl_window_swap_pixmap(xwl_window, TRUE);
buffer = xwl_pixmap_get_wl_buffer(pixmap);
if (!buffer) {