From 55aaea7995f577187dc282f54f1b8903a9b7f248 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fran=C3=A7ois=20Beaufort?= <beaufort.francois@gmail.com>
Date: Fri, 13 Jun 2025 16:47:09 +0200
Subject: [PATCH] Fix blur artifacts

---
 sample/imageBlur/blur.wgsl | 2 +-
 sample/imageBlur/main.ts   | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/sample/imageBlur/blur.wgsl b/sample/imageBlur/blur.wgsl
index ef4184f0..aa8a3773 100644
--- a/sample/imageBlur/blur.wgsl
+++ b/sample/imageBlur/blur.wgsl
@@ -50,7 +50,7 @@ fn main(
       tile[r][4 * LocalInvocationID.x + u32(c)] = textureSampleLevel(
         inputTex,
         samp,
-        (vec2f(loadIndex) + vec2f(0.25, 0.25)) / vec2f(dims),
+        (vec2f(loadIndex) + vec2f(0.5, 0.5)) / vec2f(dims),
         0.0
       ).rgb;
     }
diff --git a/sample/imageBlur/main.ts b/sample/imageBlur/main.ts
index 0406c7e2..dfb4c96c 100644
--- a/sample/imageBlur/main.ts
+++ b/sample/imageBlur/main.ts
@@ -220,11 +220,11 @@ const settings = {
 
 let blockDim: number;
 const updateSettings = () => {
-  blockDim = tileDim - (settings.filterSize - 1);
+  blockDim = tileDim - settings.filterSize;
   device.queue.writeBuffer(
     blurParamsBuffer,
     0,
-    new Uint32Array([settings.filterSize, blockDim])
+    new Uint32Array([settings.filterSize + 1, blockDim])
   );
 };
 const gui = new GUI();