From e798db04c83f6dddd4b500d54866b7c4edbe892c Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 25 Jan 2016 10:45:07 +0000
Subject: [PATCH] From John Farrier, "Best I can tell, there is an enumeration
 for NEVER_CHECK_GL_ERRORS in CheckForGLErrors, defined in State.  State.cpp
 does check to see if you want MORE error checking, but there is no way to
 turn OFF error checking. This change allows disabling of OpenGL error
 checking."

---
 src/osg/State.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/osg/State.cpp b/src/osg/State.cpp
index f81257b09..83af4211e 100644
--- a/src/osg/State.cpp
+++ b/src/osg/State.cpp
@@ -79,6 +79,10 @@ State::State():
     {
         _checkGLErrors = ONCE_PER_ATTRIBUTE;
     }
+    else if(str && (strcmp(str, "OFF") == 0 || strcmp(str, "off") == 0))
+    {
+        _checkGLErrors = NEVER_CHECK_GL_ERRORS;
+    }
 
     _currentActiveTextureUnit=0;
     _currentClientActiveTextureUnit=0;