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3DNow! Games and Developer's
How is 3D Now! Optimized?
There are many different kinds of tools for developer's to support 3DNow!
As you may not know, the following compilers have have varying levels of 3DNow! support:Metroworks Codewarrior, Microsoft Visual C++ and Sybase's Watcom C++. For example, where there is a lot of floating point math.
Taking the source code from Quake2 and running it through the Metroworks compilerwould probably give about a 30% speed increase; just for compiling the code!
In other words, the developer doesn't have to do jack shit, but their game is optimized and accelerated by 3DNow!.
As far as Descent games go, we should see some sort of support from those games... There will be an announcement about this soon.
The Valve Situation
On a positive note, with a bit of renaming of the Quake2 3DNow! mini-gl, you can put it in your Half-Life folder and still see a 20-30% improvement.
Video Card 3D Now! Support
ATI, Nvidia,3Dfx,Matrox,S3, all do or will support 3DNow!. So, to turn the it up every video card manufacturer that gamers would care about does support it. Yet, even if they're all going to support 3D Now!, some companies have better drivers for it in their APIs.