From 9f81ef8561ae8181ca8847cbc60b66105f645d23 Mon Sep 17 00:00:00 2001
From: Robert Osfield <robert@openscenegraph.com>
Date: Fri, 14 Jul 2006 14:38:55 +0000
Subject: [PATCH] Implemented Radeon workaround for polygonoffset

---
 src/osg/PolygonOffset.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/osg/PolygonOffset.cpp b/src/osg/PolygonOffset.cpp
index cd5c17d32..faaf35454 100644
--- a/src/osg/PolygonOffset.cpp
+++ b/src/osg/PolygonOffset.cpp
@@ -52,6 +52,18 @@ void PolygonOffset::setFactorAndUnitMultipliersUsingBestGuessForDriver()
 {
     s_MultiplerSet = true;
     // osg::notify(osg::NOTICE)<<"PolygonOffset::setFactorAndUnitMultipliersUsingBestGuessForDriver()"<<std::endl;
+
+    const GLubyte* renderer = glGetString(GL_RENDERER);
+    if (renderer)
+    {
+        if ((strstr((const char*)renderer,"Radeon")!=0) ||
+            (strstr((const char*)renderer,"RADEON")!=0))
+        {
+            setFactorMultiplier(256.0f);
+            setUnitMultiplier(256.0f);
+            osg::notify(osg::INFO)<<"PolygonOffset::setFactorAndUnitMultipliersUsingBestGuessForDriver() apply ATI workaround."<<std::endl;
+        }
+    }
 }