float4 getTexel(Texture2D tex, float2 p, float lod)
{
    float2 res = textureSize(tex, int(lod) );
    p = p*res + 0.5;

    float2 i = floor(p);
    float2 f = p - i;
    f = f*f*f*(f*(f*6.0-15.0)+10.0);
    p = i + f;

    p = (p - 0.5)/res;
    return Sample2DLod( tex, p, lod );
}

// 5 это количество лодов
RT0.rgb = mix(getTexel(Translucent, SV_Position.xy / Resolution, _Roughness * 5).rgb, Color.rgb, Color.a);