From dea22aeb8e42a8b0a50b474330b90ef9ef94bfc4 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 17 Feb 2004 09:46:16 +0000
Subject: [PATCH] Added support for a OSG_DISABLE_FAST_PATH_IN_DISPLAY_LISTS
 environmental variable in the computeFastPathsUsed() method so that use of
 vertex arrays can be forced off.  This is a work around for a bug in the
 OpenGL drivers in OSX/Panther.

---
 src/osg/Geometry.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/osg/Geometry.cpp b/src/osg/Geometry.cpp
index 6306525dd..9a16e6bff 100644
--- a/src/osg/Geometry.cpp
+++ b/src/osg/Geometry.cpp
@@ -659,6 +659,14 @@ unsigned int Geometry::getPrimitiveSetIndex(const PrimitiveSet* primitiveset) co
 
 bool Geometry::computeFastPathsUsed()
 {
+    static bool s_DisableFastPathInDisplayLists = getenv("OSG_DISABLE_FAST_PATH_IN_DISPLAY_LISTS");
+    if (_useDisplayList && s_DisableFastPathInDisplayLists)
+    {
+        osg::notify(osg::DEBUG_INFO)<<"Geometry::computeFastPathsUsed() - Disabling fast paths in display lists"<<std::endl;
+        _fastPath = false;
+        return _fastPath;
+    }
+
     ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
     //
     // check to see if fast path can be used.