<shaders>
    <shader type="vs">
        <variation name="" />
        <variation name="Skinned" define="SKINNED" />
        <variation name="Instanced" define="INSTANCED" require="SM3" />
    </shader>
    <shader type="ps">
        <option name="AlphaMask" define="ALPHAMASK" />
    </shader>
</shaders>
