From e72ec7bb155a95e8a4ef4d0c2ba0c144bba1c314 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 11 May 2007 13:45:53 +0000
Subject: [PATCH] From Uwe Woessner, fixed handling of read/draw buffer in
 vertical interlaced stereo

---
 src/osgUtil/SceneView.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/osgUtil/SceneView.cpp b/src/osgUtil/SceneView.cpp
index a54b5ef84..1ffffa491 100644
--- a/src/osgUtil/SceneView.cpp
+++ b/src/osgUtil/SceneView.cpp
@@ -1156,6 +1156,13 @@ void SceneView::draw()
             break;
         case(osg::DisplaySettings::VERTICAL_INTERLACE):
             {
+                if( getDrawBufferValue() !=  GL_NONE)
+                {
+                    _renderStageLeft->setDrawBuffer(getDrawBufferValue());
+                    _renderStageLeft->setReadBuffer(getDrawBufferValue());
+                    _renderStageRight->setDrawBuffer(getDrawBufferValue());
+                    _renderStageRight->setReadBuffer(getDrawBufferValue());
+                }
                 _localStateSet->setAttribute(getViewport());
 
                 // ensure that all color planes are active.
@@ -1226,6 +1233,13 @@ void SceneView::draw()
             break;
         case(osg::DisplaySettings::HORIZONTAL_INTERLACE):
             {
+         if( getDrawBufferValue() !=  GL_NONE)
+         {
+           _renderStageLeft->setDrawBuffer(getDrawBufferValue());
+           _renderStageLeft->setReadBuffer(getDrawBufferValue());
+           _renderStageRight->setDrawBuffer(getDrawBufferValue());
+           _renderStageRight->setReadBuffer(getDrawBufferValue());
+         }
                 _localStateSet->setAttribute(getViewport());
 
                 // ensure that all color planes are active.