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[client] wayland: serialize surface commits with EGL swaps

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NVIDIA's Wayland EGL implementation sets explicit-sync acquire and
release points while presenting a frame. The requests emitted by
eglSwapBuffers and its final surface commit must be treated as one
logical transaction.

The pointer-warp path can commit the main surface from the input
thread while the render thread is inside eglSwapBuffers. If this
occurs between the explicit-sync requests, the cursor commit applies
incomplete pending state and the compositor disconnects the client
with:

  explicit sync is used, but no release point is set

Add a surface lock and hold it across EGL presentation. Use the same
lock for direct commits, frame callback registration, and
pointer-constraint updates, replacing the narrower confinement lock.
This prevents another thread from splitting the EGL transaction and
removes the need for __NV_DISABLE_EXPLICIT_SYNC=1.
This commit is contained in:
Geoffrey McRae
2026-07-30 11:09:07 +10:00
parent a9b8f437d4
commit f3155647d2
5 changed files with 74 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
client/displayservers/Wayland/gl.c
View File

@@ -229,6 +229,11 @@ static const struct wp_image_description_v1_listener hdrImageDescListener =
};
void waylandEGLSwapBuffers(EGLDisplay display, EGLSurface surface, const struct Rect * damage, int count)
{
// EGL presentation sends a batch of Wayland requests ending in a surface
// commit. A concurrent commit would apply a partial batch and, when explicit
// sync is active, omit one of the required acquire/release timeline points.
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
if (!wlWm.swapWithDamage.init)
{
@@ -245,6 +250,7 @@ void waylandEGLSwapBuffers(EGLDisplay display, EGLSurface surface, const struct
applyHDRPending();
swapWithDamage(&wlWm.swapWithDamage, display, surface, damage, count);
activateReadyHDRImageDesc();
});
if (wlWm.needsResize)
{

23
client/displayservers/Wayland/input.c
View File

@@ -322,7 +322,8 @@ static const struct wl_keyboard_listener keyboardListener = {
static void waylandCleanUpPointer(void)
{
INTERLOCKED_SECTION(wlWm.confineLock, {
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
if (wlWm.lockedPointer)
{
zwp_locked_pointer_v1_destroy(wlWm.lockedPointer);
@@ -438,15 +439,12 @@ bool waylandInputInit(void)
wl_seat_add_listener(wlWm.seat, &seatListener, NULL);
wl_display_roundtrip(wlWm.display);
LG_LOCK_INIT(wlWm.confineLock);
return true;
}
void waylandInputFree(void)
{
waylandUngrabPointer();
LG_LOCK_FREE(wlWm.confineLock);
if (wlWm.pointer)
waylandCleanUpPointer();
@@ -482,7 +480,7 @@ void waylandGrabPointer(void)
&relativePointerListener, NULL);
}
INTERLOCKED_SECTION(wlWm.confineLock,
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
if (!wlWm.confinedPointer && !wlWm.lockedPointer)
{
@@ -496,7 +494,7 @@ void waylandGrabPointer(void)
inline static void internalUngrabPointer(bool lock)
{
if (lock)
LG_LOCK(wlWm.confineLock);
LG_LOCK(wlWm.surfaceLock);
if (wlWm.confinedPointer)
{
@@ -505,7 +503,7 @@ inline static void internalUngrabPointer(bool lock)
}
if (lock)
LG_UNLOCK(wlWm.confineLock);
LG_UNLOCK(wlWm.surfaceLock);
if (!wlWm.warpSupport)
{
@@ -536,7 +534,7 @@ void waylandCapturePointer(void)
return;
}
INTERLOCKED_SECTION(wlWm.confineLock,
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
if (wlWm.confinedPointer)
{
@@ -552,7 +550,7 @@ void waylandCapturePointer(void)
void waylandUncapturePointer(void)
{
INTERLOCKED_SECTION(wlWm.confineLock,
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
if (wlWm.lockedPointer)
{
@@ -601,11 +599,10 @@ void waylandWarpPointer(int x, int y, bool exiting)
if (!wlWm.pointerInSurface || wlWm.lockedPointer)
return;
INTERLOCKED_SECTION(wlWm.confineLock,
{
LG_LOCK(wlWm.surfaceLock);
if (wlWm.lockedPointer)
{
LG_UNLOCK(wlWm.confineLock);
LG_UNLOCK(wlWm.surfaceLock);
return;
}
@@ -638,7 +635,7 @@ void waylandWarpPointer(int x, int y, bool exiting)
wl_surface_commit(wlWm.surface);
wl_region_destroy(region);
});
LG_UNLOCK(wlWm.surfaceLock);
}
void waylandRealignPointer(void)

2
client/displayservers/Wayland/wayland.c
View File

@@ -108,6 +108,7 @@ static bool getCompositor(char * dst, size_t size)
static bool waylandInit(const LG_DSInitParams params)
{
memset(&wlWm, 0, sizeof(wlWm));
LG_LOCK_INIT(wlWm.surfaceLock);
LG_LOCK_INIT(wlWm.pendingHDRLock);
LG_LOCK_INIT(wlWm.hdrLock);
wlWm.desktop = WL_Desktops[0];
@@ -214,6 +215,7 @@ static void waylandFree(void)
wl_display_disconnect(wlWm.display);
LG_LOCK_FREE(wlWm.hdrLock);
LG_LOCK_FREE(wlWm.pendingHDRLock);
LG_LOCK_FREE(wlWm.surfaceLock);
}
static bool waylandGetProp(LG_DSProperty prop, void * ret)

2
client/displayservers/Wayland/wayland.h
View File

@@ -134,6 +134,7 @@ struct WaylandDSState
struct wl_seat * seat;
struct wl_shm * shm;
struct wl_compositor * compositor;
LG_Lock surfaceLock;
struct WaylandScale scale;
bool fractionalScale;
@@ -192,7 +193,6 @@ struct WaylandDSState
struct zwp_locked_pointer_v1 * lockedPointer;
bool showPointer;
uint32_t pointerEnterSerial;
LG_Lock confineLock;
struct zwp_idle_inhibit_manager_v1 * idleInhibitManager;
struct zwp_idle_inhibitor_v1 * idleInhibitor;

9
client/displayservers/Wayland/window.c
View File

@@ -154,7 +154,10 @@ bool waylandWindowInit(const char * title, const char * appId, bool fullscreen,
title, appId, fullscreen, maximize, borderless, resizable))
return false;
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
wl_surface_commit(wlWm.surface);
});
// The initial configure supplies the compositor-selected size for states
// such as fullscreen. It must be received before the first buffer is made.
@@ -214,9 +217,12 @@ bool waylandWaitFrame(void)
{
lgWaitEvent(wlWm.frameEvent, TIMEOUT_INFINITE);
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
struct wl_callback * callback = wl_surface_frame(wlWm.surface);
if (callback)
wl_callback_add_listener(callback, &frame_listener, NULL);
});
return false;
}
@@ -224,7 +230,10 @@ bool waylandWaitFrame(void)
void waylandSkipFrame(void)
{
// If we decided to not render, we must commit the surface so that the callback is registered.
INTERLOCKED_SECTION(wlWm.surfaceLock,
{
wl_surface_commit(wlWm.surface);
});
}
void waylandStopWaitFrame(void)