From ea75aa30657eacaec827ab6844ba77d328ab5155 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Thu, 21 Oct 2021 15:02:09 +0200
Subject: [PATCH] render/drm_syncobj: add wlr_drm_syncobj_timeline_import()

---
 include/wlr/render/drm_syncobj.h |  5 +++++
 render/drm_syncobj.c             | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/include/wlr/render/drm_syncobj.h b/include/wlr/render/drm_syncobj.h
index f879b5929..8b3609eeb 100644
--- a/include/wlr/render/drm_syncobj.h
+++ b/include/wlr/render/drm_syncobj.h
@@ -37,6 +37,11 @@ struct wlr_drm_syncobj_timeline {
  * Create a new synchronization timeline.
  */
 struct wlr_drm_syncobj_timeline *wlr_drm_syncobj_timeline_create(int drm_fd);
+/**
+ * Import a timeline from a drm_syncobj FD.
+ */
+struct wlr_drm_syncobj_timeline *wlr_drm_syncobj_timeline_import(int drm_fd,
+	int drm_syncobj_fd);
 /**
  * Reference a synchronization timeline.
  */
diff --git a/render/drm_syncobj.c b/render/drm_syncobj.c
index 974b1b40d..f4b1c249a 100644
--- a/render/drm_syncobj.c
+++ b/render/drm_syncobj.c
@@ -21,6 +21,24 @@ struct wlr_drm_syncobj_timeline *wlr_drm_syncobj_timeline_create(int drm_fd) {
 	return timeline;
 }
 
+struct wlr_drm_syncobj_timeline *wlr_drm_syncobj_timeline_import(int drm_fd,
+		int drm_syncobj_fd) {
+	struct wlr_drm_syncobj_timeline *timeline = calloc(1, sizeof(*timeline));
+	if (timeline == NULL) {
+		return NULL;
+	}
+	timeline->drm_fd = drm_fd;
+	timeline->n_refs = 1;
+
+	if (drmSyncobjFDToHandle(drm_fd, drm_syncobj_fd, &timeline->handle) != 0) {
+		wlr_log_errno(WLR_ERROR, "drmSyncobjFDToHandle failed");
+		free(timeline);
+		return NULL;
+	}
+
+	return timeline;
+}
+
 struct wlr_drm_syncobj_timeline *wlr_drm_syncobj_timeline_ref(struct wlr_drm_syncobj_timeline *timeline) {
 	timeline->n_refs++;
 	return timeline;