From fe67a91e8327e9d97466a61342774f1e097ff234 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Tue, 13 Feb 2007 16:03:35 +0000
Subject: [PATCH] Added OSG_THREADING environmental variable to
 osgViewer::Viewer::suggestBestThreadingModel

---
 src/osgViewer/Viewer.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/osgViewer/Viewer.cpp b/src/osgViewer/Viewer.cpp
index 3ffcf40d1..4551027af 100644
--- a/src/osgViewer/Viewer.cpp
+++ b/src/osgViewer/Viewer.cpp
@@ -947,8 +947,19 @@ struct ViewerRunOperations : public osg::Operation
     }
 };
 
+static osg::ApplicationUsageProxy Viewer_e0(osg::ApplicationUsage::ENVIRONMENTAL_VARIABLE,"OSG_THREADING <value>","Set the threading model using by Viewer, <value> can be SingleThreaded, CullDrawThreadPerContext, DrawThreadPerContext or CullThreadPerCameraDrawThreadPerContext.");
+
 Viewer::ThreadingModel Viewer::suggestBestThreadingModel()
 {
+    const char* str = getenv("OSG_THREADING");
+    if (str)
+    {
+        if (strcmp(str,"SingleThreaded")==0) return SingleThreaded;
+        else if (strcmp(str,"CullDrawThreadPerContext")==0) return CullDrawThreadPerContext;
+        else if (strcmp(str,"DrawThreadPerContext")==0) return CullDrawThreadPerContext;
+        else if (strcmp(str,"CullThreadPerCameraDrawThreadPerContext")==0) return CullThreadPerCameraDrawThreadPerContext;
+    }
+
     Contexts contexts;
     getContexts(contexts);