From 598e9e9d51a289aa5989502f66d9fc2a8bcfb013 Mon Sep 17 00:00:00 2001
From: Julian Orth <ju.orth@gmail.com>
Date: Tue, 14 Oct 2025 15:54:02 +0200
Subject: [PATCH] linux-drm-syncobj-v1: allow explicit sync with any buffer
 type

For wl_shm clients, the buffer currently has to be ready at commit time.
Therefore such clients have to perform a blocking wait before
committing, partially or fully negating the advantages of threaded
rendering. See for example [1].

[1]: https://gitlab.freedesktop.org/mesa/mesa/-/blob/451a0bd49002713d64c4a70a292ceadcad29f943/src/vulkan/wsi/wsi_common.c#L1735-1738

Signed-off-by: Julian Orth <ju.orth@gmail.com>
---
 .../linux-drm-syncobj/linux-drm-syncobj-v1.xml  | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/staging/linux-drm-syncobj/linux-drm-syncobj-v1.xml b/staging/linux-drm-syncobj/linux-drm-syncobj-v1.xml
index 2c491ea..d93d6b4 100644
--- a/staging/linux-drm-syncobj/linux-drm-syncobj-v1.xml
+++ b/staging/linux-drm-syncobj/linux-drm-syncobj-v1.xml
@@ -55,7 +55,7 @@
     only be done by creating a new major version of the extension.
   </description>
 
-  <interface name="wp_linux_drm_syncobj_manager_v1" version="1">
+  <interface name="wp_linux_drm_syncobj_manager_v1" version="2">
     <description summary="global for providing explicit synchronization">
       This global is a factory interface, allowing clients to request
       explicit synchronization for buffers on a per-surface basis.
@@ -106,9 +106,16 @@
       <arg name="id" type="new_id" interface="wp_linux_drm_syncobj_timeline_v1"/>
       <arg name="fd" type="fd" summary="drm_syncobj file descriptor"/>
     </request>
+
+    <event name="supports_any_buffer_type" since="2">
+      <description summary="the compositor supports any buffer type">
+        This event is sent immediately after binding the global to indicate that
+        the compositor supports explicit synchronization with any buffer type.
+      </description>
+    </event>
   </interface>
 
-  <interface name="wp_linux_drm_syncobj_timeline_v1" version="1">
+  <interface name="wp_linux_drm_syncobj_timeline_v1" version="2">
     <description summary="synchronization object timeline">
       This object represents an explicit synchronization object timeline
       imported by the client to the compositor.
@@ -123,7 +130,7 @@
     </request>
   </interface>
 
-  <interface name="wp_linux_drm_syncobj_surface_v1" version="1">
+  <interface name="wp_linux_drm_syncobj_surface_v1" version="2">
     <description summary="per-surface explicit synchronization">
       This object is an add-on interface for wl_surface to enable explicit
       synchronization.
@@ -137,6 +144,10 @@
       If at surface commit time the attached buffer does not support explicit
       synchronization, an unsupported_buffer error is raised.
 
+      In version 2 and above, the compositor can send the
+      supports_any_buffer_type event to indicate that it supports explicit
+      synchronization with any buffer type.
+
       As long as the wp_linux_drm_syncobj_surface_v1 object is alive, the
       compositor may ignore implicit synchronization for buffers attached and
       committed to the wl_surface. The delivery of wl_buffer.release events