From 686c8014b2826bfe5358986e1be8984403db39e2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89lie=20Michel?= <elie.michel@exppad.com>
Date: Thu, 14 Nov 2024 18:58:01 +0100
Subject: [PATCH] Filter out negative samples

---
 sample/timestampQuery/main.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sample/timestampQuery/main.ts b/sample/timestampQuery/main.ts
index a1bb4f46..0b2e6707 100644
--- a/sample/timestampQuery/main.ts
+++ b/sample/timestampQuery/main.ts
@@ -230,6 +230,9 @@ function frame() {
   // Read timestamp value back from GPU buffers
   timestampQueryManager
     .readAsync(timestamps => {
+      // This may happen (see spec https://gpuweb.github.io/gpuweb/#timestamp)
+      if (timestamps[1] < timestamps[0]) return;
+
       // Measure difference (in bigints)
       const elapsedNs = timestamps[1] - timestamps[0];
       // Cast into regular int (ok because value is small after difference)