nvidia cg

[habahaba]

Hi,

I'm trying to work with some shaders on my macbook pro. I downloaded the toolkit, included the framework in my xcode project, and wrote:

...
CGcontext cgContext;
...
cgContext = cgCreateContext();
...


however, cgContext is NULL and the application ends :( ...
Any idea why this isnt working?

Thanks

[akb825]

I don't think ATI graphics cards support cg directly. (since it is a NVidia language) You will need to compile the shaders into assembly, then use the corresponding functions for assembly shaders.

[icklefrelp]

I don't think ATI graphics cards support cg directly. (since it is a NVidia language) You will need to compile the shaders into assembly, then use the corresponding functions for assembly shaders.

That's not actually true, I have been using Cg on my G4 Powerbook (Mobility Radeon 9600) since I got it a few years ago. You are restricted to using the ARB profiles but other than that it should generally work ok.

Saying that though, I am now moving to GLSL which integrates much better with OpenGL. If you know one, switching to the other is trivial.

[habahaba]

That's not actually true, I have been using Cg on my G4 Powerbook (Mobility Radeon 9600) since I got it a few years ago. You are restricted to using the ARB profiles but other than that it should generally work ok.

Saying that though, I am now moving to GLSL which integrates much better with OpenGL. If you know one, switching to the other is trivial.


do you use GLEW ?
and one more thing: whats this AGL and GLX things? there are downloads of glew binaries for both, which one should i choose?

[icklefrelp]

do you use GLEW ?
and one more thing: whats this AGL and GLX things? there are downloads of glew binaries for both, which one should i choose?

I don't use GLEW although I should probably look into it, currently I don't check for supported extensions as I know the extensions I'm using are supported on my machines.

I assume you want the AGL version, I'm guessing the GLX version is for OpenGl on X11.

[OneSadCookie]

Cg should work fine, but doesn't give you access to the full power of any modern ATI hardware (including the X1600 in yourMBP). It's also not a technology many people use on the Mac. I'd highly recommend using GLSL.