From 7a074acd49c15838654587df74938f03add0fbd0 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Mon, 12 May 2008 11:39:02 +0000
Subject: [PATCH] From Mathias Froehlich, Fixed FrameBufferObject attachement
 code to handle cases where no texture or image is attached

---
 src/osgUtil/RenderStage.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/osgUtil/RenderStage.cpp b/src/osgUtil/RenderStage.cpp
index 56c01c7cb..0531657f2 100644
--- a/src/osgUtil/RenderStage.cpp
+++ b/src/osgUtil/RenderStage.cpp
@@ -340,7 +340,10 @@ void RenderStage::runCameraSetUp(osg::RenderInfo& renderInfo)
                 osg::Camera::BufferComponent buffer = itr->first;
                 osg::Camera::Attachment& attachment = itr->second;
                 
-                fbo->setAttachment(buffer, osg::FrameBufferAttachment(attachment));
+                if (attachment._texture.valid() || attachment._image.valid())
+                    fbo->setAttachment(buffer, osg::FrameBufferAttachment(attachment));
+                else
+                    fbo->setAttachment(buffer, osg::FrameBufferAttachment(new osg::RenderBuffer(width, height, attachment._internalFormat)));
                 
                 if (buffer==osg::Camera::DEPTH_BUFFER) depthAttached = true;
                 else if (buffer==osg::Camera::STENCIL_BUFFER) stencilAttached = true;