urho3d/SourceAssets/Shaders/Prepass/Material.xml

<shaders>
    <shader name="Material" type="vs">
        <option name="VCol" define="VERTEXCOLOR" />
        <variation name="" />
        <variation name="Skinned" define="SKINNED" />
        <variation name="Instanced" define="INSTANCED" />
    </shader>
    <shader name="Material" type="ps">
        <option name="Diff" define="DIFFMAP" />
        <option name="Spec" define="SPECMAP" />
        <option name="VCol" define="VERTEXCOLOR" />        
        <option name="Mask" define="ALPHAMASK" include="Diff" />
    </shader>
</shaders>