From 763c53eb55eda9928b5cb6318e8061d77b2c8113 Mon Sep 17 00:00:00 2001
From: Garrett Johnson <garrett.kjohnson@gmail.com>
Date: Fri, 17 Nov 2023 19:07:16 +0900
Subject: [PATCH] WebGPURenderer: Add "updateRanges" support for
 WebGLAttributeUtils (#27149)

* Add "updateRanges" support for WebGLAttributeUtils

* Fix failed test
---
 .../webgl/utils/WebGLAttributeUtils.js        | 23 ++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/examples/jsm/renderers/webgl/utils/WebGLAttributeUtils.js b/examples/jsm/renderers/webgl/utils/WebGLAttributeUtils.js
index 7372b3dfe7b20d..8cdee5b2cb7630 100644
--- a/examples/jsm/renderers/webgl/utils/WebGLAttributeUtils.js
+++ b/examples/jsm/renderers/webgl/utils/WebGLAttributeUtils.js
@@ -105,9 +105,30 @@ class WebGLAttributeUtils {
 		const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
 		const bufferData = backend.get( bufferAttribute );
 		const bufferType = bufferData.bufferType;
+		const updateRanges = attribute.isInterleavedBufferAttribute ? attribute.data.updateRanges : attribute.updateRanges;
 
 		gl.bindBuffer( bufferType, bufferData.bufferGPU );
-		gl.bufferSubData( bufferType, 0, array );
+
+		if ( updateRanges.length === 0 ) {
+
+			// Not using update ranges
+
+			gl.bufferSubData( bufferType, 0, array );
+
+		} else {
+
+			for ( let i = 0, l = updateRanges.length; i < l; i ++ ) {
+
+				const range = updateRanges[ i ];
+				gl.bufferSubData( bufferType, range.start * array.BYTES_PER_ELEMENT,
+					array, range.start, range.count );
+
+			}
+
+			bufferAttribute.clearUpdateRanges();
+
+		}
+
 		gl.bindBuffer( bufferType, null );
 
 		bufferData.version = bufferAttribute.version;