Using single channel floating point texture for lookup-table in cg-Shader

Hi,

is there a possibility to create a Texture2D with a single channel floating point format (analog to ARB_texture_float)? I am trying to build 2D-lookup-texture of float data (8-bit precision is not sufficient for my application) for my shader and don't know how to implement this. The TextureFormat enumeration does not look very promising, but I found that RenderTexure supports a format like RenderTextureFormat.RFormat. Now I'm kind of stuck writing into the RenderTexture instance in my C# code before passing it to my Cg shader and I'm wondering if this is the recommended way of doing what I'm trying to do.

Thanks, iko