From 87eaed7ca96895c37d5d43986d741be7bdd7ad66 Mon Sep 17 00:00:00 2001
From: Forrest <forrest.li@kitware.com>
Date: Wed, 13 Sep 2023 15:31:19 -0400
Subject: [PATCH] fix(ImageMapper): use norm16 ext

This keeps the ImageMapper in-line with the VolumeMapper.
---
 Sources/Rendering/OpenGL/ImageMapper/index.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Sources/Rendering/OpenGL/ImageMapper/index.js b/Sources/Rendering/OpenGL/ImageMapper/index.js
index 583eae22099..2ef0302dbc6 100644
--- a/Sources/Rendering/OpenGL/ImageMapper/index.js
+++ b/Sources/Rendering/OpenGL/ImageMapper/index.js
@@ -927,6 +927,10 @@ function vtkOpenGLImageMapper(publicAPI, model) {
     if (model.VBOBuildString !== toString) {
       // Build the VBOs
       const dims = image.getDimensions();
+      // Use norm16 for scalar texture if the extension is available
+      model.openGLTexture.setOglNorm16Ext(
+        model.context.getExtension('EXT_texture_norm16')
+      );
       if (iType === InterpolationType.NEAREST) {
         if (
           new Set([1, 3, 4]).has(numComp) &&