How can i make a LUT Shader with a dropdown selector

[Labont]

Hey, i learned a lot of things and now i'm trying to make a LUT Shader, but idk how to make a shader for a dropdown selector that changes the lut texture which is 4096x64px. I'd also try to add a Intensity, Black/White Input and Black/White Output. So how do i proceed?

[ENBSeries]

Find shaders on Nexus with same features and learn from them. It's much simpler to understand from existing examples. This is compex enough to write how to do. In short, textures must be created at the start all, then dropdown box just to switch code path to read one of them, quantity of lut textures influence performance because of this and it's can't be avoid cause of limitations of hlsl. Something like this:
if (lutindex==1)
{
lut = TextureLut1.Sample(Sampler, lutuv);
}
if (lutindex==2)
{
lut = TextureLut2.Sample(Sampler, lutuv);
}
if (lutindex==3)
{
lut = TextureLut3.Sample(Sampler, lutuv);
}