Nvidia's Windows driver version 355.58 and Linux drivers version 355.00.05 provide beta support for OpenGL 2015 ARB extensions and OpenGL ES 3.2 on capable hardware.
3dfx never had a full OpenGL implementation until the Voodoo 4/5's came around if I'm not mistaken, 3dfx had MiniGL though. which I "think" Half-Life/Counter-Strike indeed support, along with Direct3D ...
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