UnityShaderシャドウのShadowCaster

Pass
    {
        Tags {"LightMode"="ShadowCaster"}

        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag
        #pragma multi_compile_shadowcaster
        #include "UnityCG.cginc"

        struct v2f { 
            V2F_SHADOW_CASTER;
        };

        v2f vert(appdata_base v)
        {
            v2f o;
            TRANSFER_SHADOW_CASTER(o)
            return o;
        }

        float4 frag(v2f i) : SV_Target
        {
            SHADOW_CASTER_FRAGMENT(i)
        }
        ENDCG
    }