From 52e036f425b71bf1d6c4f5bc54eefd6436464a56 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 6 May 2005 19:44:24 +0000
Subject: [PATCH] Added handling of sharing of graphics context data which is
 now supported by Producer.  You can get the osgProducer::Viewer to share
 graphics contexts by using the env var OSG_SHARE_GRAPHICS_CONTEXTS set to ON
 or OFF i.e.

   setenv OSG_SHARE_GRAPHICS_CONTEXTS ON
---
 src/osgProducer/OsgCameraGroup.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/osgProducer/OsgCameraGroup.cpp b/src/osgProducer/OsgCameraGroup.cpp
index 75634c941..94f4c1681 100644
--- a/src/osgProducer/OsgCameraGroup.cpp
+++ b/src/osgProducer/OsgCameraGroup.cpp
@@ -212,8 +212,16 @@ void OsgCameraGroup::_init()
     if (str)
     {
         if (strcmp(str,"SingleThreaded")==0) _thread_model = SingleThreaded;
-        else _thread_model = ThreadPerCamera;
+        else if (strcmp(str,"ThreadPerCamera")==0) _thread_model = ThreadPerCamera;
     }
+    
+    str = getenv("OSG_SHARE_GRAPHICS_CONTEXTS");
+    if (str)
+    {
+        if (strcmp(str,"ON")==0) Producer::RenderSurface::shareAllGLContexts(true);
+        else if (strcmp(str,"OFF")==0) Producer::RenderSurface::shareAllGLContexts(false);
+    }
+    
 
     _scene_data = NULL;
     _global_stateset = NULL;
@@ -453,7 +461,11 @@ bool OsgCameraGroup::realize()
         if (_renderSurfaceStateMap.count(rs)==0)
         {
             _renderSurfaceStateMap[rs] = sv->getState();
-            sv->getState()->setContextID(contextID++);
+            sv->getState()->setContextID(contextID);
+            
+            // if we aren't share OpenGL objects between graphics contexts then need to increment the contextID
+            // to ensure that the OSG generates seperate objects for each graphics context. 
+            if (!Producer::RenderSurface::allGLContextsAreShared()) ++contextID;
         }
         else
         {