Revert "Attach shaders to geometry that lacks a stateset if necessary (bug #7251)"

This reverts commit d33be39fb6c00e738a0230a88cbad3a121dcfb3f.

components/shader/shadervisitor.cpp

@@ -820,24 +820,42 @@ namespace Shader
 
     void ShaderVisitor::apply(osg::Geometry& geometry)
     {
-        pushRequirements(geometry);
+        bool needPop = (geometry.getStateSet() != nullptr);
         if (geometry.getStateSet()) // TODO: check if stateset affects shader permutation before pushing it
+        {
+            pushRequirements(geometry);
             applyStateSet(geometry.getStateSet(), geometry);
+        }
 
+        if (!mRequirements.empty())
+        {
             const ShaderRequirements& reqs = mRequirements.back();
-        adjustGeometry(geometry, reqs);
-        createProgram(reqs);
 
+            adjustGeometry(geometry, reqs);
+
+            createProgram(reqs);
+        }
+        else
+            ensureFFP(geometry);
+
+        if (needPop)
             popRequirements();
     }
 
     void ShaderVisitor::apply(osg::Drawable& drawable)
+    {
+        bool needPop = drawable.getStateSet();
+
+        if (needPop)
         {
             pushRequirements(drawable);
 
             if (drawable.getStateSet())
                 applyStateSet(drawable.getStateSet(), drawable);
+        }
 
+        if (!mRequirements.empty())
+        {
             const ShaderRequirements& reqs = mRequirements.back();
             createProgram(reqs);
 
@@ -863,6 +881,12 @@ namespace Shader
                     osgaRig->setSourceRigGeometry(sourceOsgaRigGeometry);
                 }
             }
+
+        }
+        else
+            ensureFFP(drawable);
+
+        if (needPop)
             popRequirements();
     }