How do I implement multiple material in deferred shading?

Isn't their an article on the web about doing this with 8-bits of one of your gbuffer's rendertargets?

This was the second google result when searching for "deferred shading multiple materials" and could perhaps be of help. It has a link to another page from NVIDIA with more information. I just skimmed it through so I'm not sure it's exactly what you're looking for.

Isn't their an article on the web about doing this with 8-bits of one of your gbuffer's rendertargets?

Yes, But it's so terrible.

I want to present more material types in lighting stage, but I can't do that. One disadvantage of deferred shading is the limited amount of material types.

This was the second google result when searching for "deferred shading multiple materials" and could perhaps be of help. It has a link to another page from NVIDIA with more information. I just skimmed it through so I'm not sure it's exactly what you're looking for.

Whatever. Thank you to answer my question. Thank you very much!

This was the second google result when searching for "deferred shading multiple materials" and could perhaps be of help. It has a link to another page from NVIDIA with more information. I just skimmed it through so I'm not sure it's exactly what you're looking for.

deffered rendering demands one front pass, in which you fill the data to G buffers. Besides normals and position info, you can also fill in plain diffuse color, so I would render colors (materials) in front pass and have material pick logic in front shader. In deffered I would apply rest of shading that can be done on those data.