From 3902e6561877cecdb0ee7b3b30188f5e5147171f Mon Sep 17 00:00:00 2001
From: Daniel McNab <36049421+DJMcNab@users.noreply.github.com>
Date: Mon, 16 Jan 2023 20:20:20 +0000
Subject: [PATCH] Fix missing barriers in the `pathtag_scan`s (#255)

Co-authored-by: Raph Levien <raph.levien@gmail.com>

Co-authored-by: Raph Levien <raph.levien@gmail.com>
---
 shader/pathtag_scan.wgsl  | 1 +
 shader/pathtag_scan1.wgsl | 1 +
 2 files changed, 2 insertions(+)

diff --git a/shader/pathtag_scan.wgsl b/shader/pathtag_scan.wgsl
index 009e3b4..0d8e9e5 100644
--- a/shader/pathtag_scan.wgsl
+++ b/shader/pathtag_scan.wgsl
@@ -60,6 +60,7 @@ fn main(
         workgroupBarrier();
         sh_monoid[local_id.x] = agg_part;
     }
+    workgroupBarrier();
     // prefix up to this workgroup
 #ifdef small
     var tm = sh_parent[0];
diff --git a/shader/pathtag_scan1.wgsl b/shader/pathtag_scan1.wgsl
index 1d36ab5..13c31c5 100644
--- a/shader/pathtag_scan1.wgsl
+++ b/shader/pathtag_scan1.wgsl
@@ -55,6 +55,7 @@ fn main(
         workgroupBarrier();
         sh_monoid[local_id.x] = agg;
     }
+    workgroupBarrier();
     // prefix up to this workgroup
     var tm = sh_parent[0];
     if local_id.x > 0u {