Open source Cg compiler?

[King InuYasha]

On Thu, Apr 9, 2009 at 1:07 PM, Callum Lerwick <seg at haxxed.com> wrote:

> On Thu, 2009-04-09 at 14:40 +0200, Rudolf Kastl wrote:
> > its like that since ages but actually the generated glsl code is not
> > really pretty in alot test cases i did.
>
> Yes, near as I can tell, Cg is really primarily used as a code
> obfuscation method. Something that is fundamentally at odds with open
> source. So I have no idea why any self respecting open source project
> would even want to touch it.
>
> Also, its rumored that it favors nvidia. Nvidia's drivers compile Cg to
> native Nvidia binary code, and output sub-par GLSL/HLSL on everything
> else.
>
> Crystal Space uses Cg. WHY? They don't even use Direct3D. The only
> justification for Cg instead of GLSL is if you're wanting to share
> shaders across OpenGL and Direct3D, in which case writing in HLSL and
> using ATI's tool is a non-proprietary solution. (Now how about a
> GLSL2HLSL compiler...)
>
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Maybe because it makes it easy to make shaders to both GLSL and HLSL? For
open source projects like PCSX2 which need shaders a lot, it is absolutely
necessary that the SL output is equivalent on OGL and D3D.
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