Glide api is very similar to an opengl api. Glide api is very close to native 3dfx hardware. So opengl api appears more easy to implement in 3dfx hardware and I think opengl 3dfx will be faster than 3dfx directx. And more important - directx uses COM model which doesn't exist in most unicies (except for 3rdparty commercial COM libraries which is useless).
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Glide api is very similar to an opengl api. Glide api is very close to native 3dfx hardware. So opengl api appears more easy to implement in 3dfx hardware and I think opengl 3dfx will be faster than 3dfx directx. And more important - directx uses COM model which doesn't exist in most unicies (except for 3rdparty commercial COM libraries which is useless).