From 7f3f995c56530af0f8c2904c1bd28296f6276ebb Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Thu, 9 Mar 2017 17:47:27 +0000
Subject: [PATCH] Improved handling of VBO/VAO's in Text3D

---
 src/osgText/Text3D.cpp | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/src/osgText/Text3D.cpp b/src/osgText/Text3D.cpp
index 719f91f6a..b21927a8d 100644
--- a/src/osgText/Text3D.cpp
+++ b/src/osgText/Text3D.cpp
@@ -499,13 +499,17 @@ void Text3D::drawImplementation(osg::RenderInfo& renderInfo) const
         // OSG_NOTICE<<"No need to apply matrix "<<std::endl;
     }
 
+    osg::VertexArrayState* vas = state.getCurrentVertexArrayState();
+    bool usingVertexArrayObjects = usingVertexBufferObjects && state.useVertexArrayObject(_useVertexArrayObject);
+    bool requiresSetArrays = !usingVertexBufferObjects || !usingVertexArrayObjects || vas->getRequiresSetArrays();
 
-    state.lazyDisablingOfVertexAttributes();
-
-    state.setVertexPointer(_coords.get());
-    state.setNormalPointer(_normals.get());
-
-    state.applyDisablingOfVertexAttributes();
+    if (requiresSetArrays)
+    {
+        vas->lazyDisablingOfVertexAttributes();
+        vas->setVertexArray(state, _coords.get());
+        vas->setNormalArray(state, _normals.get());
+        vas->applyDisablingOfVertexAttributes(state);
+    }
 
     if ((_drawMode&(~TEXT))!=0)
     {
@@ -559,6 +563,13 @@ void Text3D::drawImplementation(osg::RenderInfo& renderInfo) const
         }
     }
 
+    if (!usingVertexArrayObjects)
+    {
+        // unbind the VBO's if any are used.
+        vas->unbindVertexBufferObject();
+        vas->unbindElementBufferObject();
+    }
+
     if (needToApplyMatrix)
     {
         // restore the previous modelview matrix