Got a bit of attention.

I has some issues resolved, some crashes on some games upon start or exit, s3tc didnt support all formats, so compressed textures didnt work in Soldier of fortune. Lod_dithering and trilinear added to texture filtering, tried it on compressed textures too, but it resulted in corrupted blends. In general I have to say compressed textures look much worse than they did on mesa, future me problems, if Im not remembering incorrectly.

One bug with Heretic 2, when you jumped into water and move the camera a bit. Water texture started flickering between opaque and transparent.
And another interesting issue was with missing fog, or different color?? Or what underwater.

How it looked on mesaFx

And how on the 3dfx icd.

Now what!!??!?.... well nothing was wrong, I just had Trilinear enabled, that disables multitexturing, and that how the game adapts to multi-pass rendering. Fog breaks a separate multiply-blended lightmap pass, because the lightmaps would get fogged a second time, so it leaves lightmaps out....