More clean up for synch with 0.8.42

src/osgUtil/VisualsRequirementsVisitor.cpp

@@ -0,0 +1,64 @@
+#if defined(_MSC_VER)
+	#pragma warning( disable : 4786 )
+#endif
+
+#include <stdio.h>
+#include <list>
+#include <set>
+
+#include <osg/GeoSet>
+
+#include <osgUtil/VisualsRequirementsVisitor>
+
+using namespace osg;
+using namespace osgUtil;
+
+VisualsRequirementsVisitor::VisualsRequirementsVisitor()
+{
+    setTraversalMode(NodeVisitor::TRAVERSE_ALL_CHILDREN);
+    _requiresDoubleBuffer = true;
+    _requiresRBG = true;
+    _requiresDepthBuffer = true;
+    _minimumNumberAlphaBits = 0;
+    _minimumNumberStencilBits = 0;
+
+}
+
+void VisualsRequirementsVisitor::applyStateSet(StateSet& stateset)
+{
+   if (stateset.getMode(GL_STENCIL_TEST) & StateAttribute::ON)
+   {
+        _minimumNumberStencilBits = 1;
+   }
+
+   if (stateset.getAttribute(StateAttribute::STENCIL))
+   {
+        _minimumNumberStencilBits = 1;
+   }
+}
+
+void VisualsRequirementsVisitor::apply(Node& node)
+{
+    osg::StateSet* stateset = node.getStateSet();
+    if (stateset) applyStateSet(*stateset);
+
+    traverse(node);
+}
+
+void VisualsRequirementsVisitor::apply(Geode& geode)
+{
+    osg::StateSet* geode_stateset = geode.getStateSet();
+    if (geode_stateset) applyStateSet(*geode_stateset);
+    
+    for(int i = 0; i < geode.getNumDrawables(); i++ )
+    {
+        osg::StateSet* stateset = geode.getDrawable(i)->getStateSet();
+        if (stateset) applyStateSet(*stateset);
+    }
+}
+
+void VisualsRequirementsVisitor::apply(Impostor& impostor)
+{
+    _minimumNumberAlphaBits = 1;
+    apply((Node&)impostor);
+}