From db132395b6a18fe5b04fc141129d15f3c4d48ed9 Mon Sep 17 00:00:00 2001
From: Mike Wyrzykowski <mwyrzykowski@apple.com>
Date: Mon, 31 Aug 2026 11:00:42 -0700
Subject: [PATCH] Allow 1 ULP on canvas import tests as noted in the comment.

---
 src/webgpu/util/texture/color_space_conversions.spec.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/webgpu/util/texture/color_space_conversions.spec.ts b/src/webgpu/util/texture/color_space_conversions.spec.ts
index 56a59ac8bd11..37877a651574 100644
--- a/src/webgpu/util/texture/color_space_conversions.spec.ts
+++ b/src/webgpu/util/texture/color_space_conversions.spec.ts
@@ -96,7 +96,13 @@ g.test('util_matches_2d_canvas')
       { x: 0, y: 0, z: 0 },
       { width, height, depthOrArrayLayers: 1 },
       { actTexelView, expTexelView },
-      { maxDiffULPsForNormFormat: 0 }
+      // The canvas 2D side of this comparison is produced by the implementation's color
+      // management system, which typically quantizes to 8 bits internally, so its result
+      // may differ from this file's double-precision reference math by one unit in the
+      // last place. Several of the reference values here land within 0.05/255 of a
+      // round-to-nearest boundary (e.g. display-p3 (0x80, 0, 0x80) converts to an exact
+      // sRGB blue of 132.551/255), so requiring bit-exact agreement is not meaningful.
+      { maxDiffULPsForNormFormat: 1 }
     );
 
     if (failedPixelsMessage !== undefined) {