From aa48742190854571ee8b24c1df943318fd16b1ae Mon Sep 17 00:00:00 2001
From: Jeff Gilbert <jgilbert@mozilla.com>
Date: Wed, 27 May 2020 22:51:40 +0000
Subject: [PATCH] Bug 1636517 - When detaching a webgl fb attachment, reset
 params to defaults. r=lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D77177
---
 dom/canvas/WebGLContextGL.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dom/canvas/WebGLContextGL.cpp b/dom/canvas/WebGLContextGL.cpp
index 1ba61c129630..4f8406752b65 100644
--- a/dom/canvas/WebGLContextGL.cpp
+++ b/dom/canvas/WebGLContextGL.cpp
@@ -340,6 +340,9 @@ void WebGLContext::FramebufferAttach(const GLenum target,
   }
 
   auto safeToAttach = toAttach;
+  if (!toAttach.rb && !toAttach.tex) {
+    safeToAttach = {};
+  }
   if (!IsWebGL2() &&
       !IsExtensionEnabled(WebGLExtensionID::OES_fbo_render_mipmap)) {
     safeToAttach.mipLevel = 0;