   Cg Versus native HLSL & GLSL
  I've read some posts on this subject but they are all dated. I'm wondering how far Cg has actually come with it's product. Is it fully featured? Is it comparable to native HLSL(FX Framework) or GLSL?   
  All of them are fully featured.All of them can be fast.All of them can be slow.All of them have multiple versions, and compatability issues between them.All of them are compiled into something the actual hardware can understand, and each can achieve the same performance.None of them are inherently "better" or "worse" than the other.  Each has their own pros and cons.   