GLSL, ShaderModel 3.0 etc.

[Caspar Sawyer]

Hi,

Can anyone clarify the relationship in features that ShaderModel 3.0 has with GLSL - ie: will a card that fully supports SM3.0 fully implement GLSL? - or are there differences that mean full GLSL support will arrive later?

Thanks,

Caspar.

[Corrail]

I think with SM3.0 the majority of GLSL will be supported. I think the only feature what might cause problems are the noise functions. Anything else like loops, dynamic branching, vertex shader texture sampling, ... should be supported.

[pkaler]

Is there something similar to the PS 3.0 backface register in GLSL? And texture sampling with a user provided gradient?

[jra101]

Originally posted by PK:
Is there something similar to the PS 3.0 backface register in GLSL?gl_FrontFacing


Originally posted by PK:
And texture sampling with a user provided gradient?The dFdx() and dFdy() stdlib functions can be used with the standard texture lookup functions.

[Caspar Sawyer]

Originally posted by Corrail:
I think with SM3.0 the majority of GLSL will be supported. I think the only feature what might cause problems are the noise functions. Anything else like loops, dynamic branching, vertex shader texture sampling, ... should be supported.Great - so (in theory) Nvidia should be releasing some pretty featured drivers for GLSL that the GF6 will handle :cool: