Are you sure about Texture-lookup not being supported by ATI cards? :shock: (We are talking about Tex2d() right?). Tex2d() is AFAIK a very basic and populair HLSL function. I can't imagine it not being supported by ATI. :?

You should start looking of info about Tex2D() on ATI-cards. If you have an URL with some more info about whether it works or not, i would like to see it.

And i also would like to know about those restrictions and limitations. I think reading some more docs would be a good idea in this case.

P.S: According to MSDN, Tex2d() is supported by all shadermodels:
http://msdn.microsoft.com/en-us/libr...77(VS.85).aspx
I assume this is also the case on ATI cards.