From f17b7e696324849b54208a70bcaf4b53fba9349c Mon Sep 17 00:00:00 2001
From: vizerb <44100946+vizerb@users.noreply.github.com>
Date: Tue, 5 May 2026 23:48:25 +0200
Subject: [PATCH] WebGLRenderer: Fix stale scratch framebuffers after context
 restore (#33533)

Co-authored-by: Michael Herzog <michael.herzog@human-interactive.org>
---
 src/renderers/WebGLRenderer.js | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/renderers/WebGLRenderer.js b/src/renderers/WebGLRenderer.js
index ab28669f542ae7..3a743390c0271a 100644
--- a/src/renderers/WebGLRenderer.js
+++ b/src/renderers/WebGLRenderer.js
@@ -295,6 +295,10 @@ class WebGLRenderer {
 		let _isContextLost = false;
 		let _nodesHandler = null;
 
+		let _scratchFramebuffer = null;
+		let _srcFramebuffer = null;
+		let _dstFramebuffer = null;
+
 		// internal state cache
 
 		this._outputColorSpace = SRGBColorSpace;
@@ -438,6 +442,10 @@ class WebGLRenderer {
 
 			}
 
+			_scratchFramebuffer = _gl.createFramebuffer();
+			_srcFramebuffer = _gl.createFramebuffer();
+			_dstFramebuffer = _gl.createFramebuffer();
+
 			info = new WebGLInfo( _gl );
 			properties = new WebGLProperties();
 			textures = new WebGLTextures( _gl, extensions, state, properties, capabilities, utils, info );
@@ -2870,8 +2878,6 @@ class WebGLRenderer {
 
 		};
 
-		const _scratchFrameBuffer = _gl.createFramebuffer();
-
 		/**
 		 * Sets the active rendertarget.
 		 *
@@ -3004,7 +3010,7 @@ class WebGLRenderer {
 			// being bound that are different sizes.
 			if ( activeMipmapLevel !== 0 ) {
 
-				framebuffer = _scratchFrameBuffer;
+				framebuffer = _scratchFramebuffer;
 
 			}
 
@@ -3247,8 +3253,6 @@ class WebGLRenderer {
 
 		};
 
-		const _srcFramebuffer = _gl.createFramebuffer();
-		const _dstFramebuffer = _gl.createFramebuffer();
 
 		/**
 		 * Copies data of the given source texture into a destination texture.