On 19.06.2006 23:09, Peter Amstutz wrote: > On Mon, 19 Jun 2006, Jorrit Tyberghein wrote: > >>>> Why not use a free software shading toolkit?. What's the alternatives >>>> to CG?. >>> We are unfortunatelly not aware of any free alternatives to CG :-( > > Er? Forgive my ignorance, but why not the OpenGL Shading Language (GLSL)?
Back when we picked the shading language, we opted for Cg because of its greater backward compatibility; you can actually use it on DX8-level hardware as well (Radeon 8000, GeForce3). GLSL works only from DX9-level HW onward, and, at the time, was not available for a lot of drivers. Also, Cg allows for retrieval of "object code" for compiled programs; that is, you can compile a program once and re-use the object form later on, allowing to save the compilation overhead. -f.r.
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