krashd: I'm not sure why someone has to ask why, the game looks about 5 years younger with Glide. Same with the original Half-Life, it looked better with 3Dfx in the late 90's than it does with the DirectX Valve forced on to it for Steam.
The only downside is the driver packaged with the game is badly optimised and framerates can suffer even on good machines, if you get a good 3Dfx driver the game looks lush, far superior to DirectX.
Nah, the GOG Win8/10 supporting package is much better than GLIDE (and I was a big 3dfx fan for years.) Here's the current GOG D3d configuration file:
[D3DDrv.D3DRenderDevice]
Translucency=True
VolumetricLighting=True
ShinySurfaces=True
Coronas=True
HighDetailActors=True
UseMipmapping=True
UseTrilinear=True
UseMultitexture=True
UsePageFlipping=True
UsePalettes=True
UseFullscreen=True
UseGammaCorrection=True
DetailTextures=True
Use3dfx=False
UseTripleBuffering=True
UsePrecache=True
Use32BitTextures=True
DescFlags=1
UseVertexFog=True
UseAGPTextures=False
UseVideoMemoryVB=False
UseVSync=False
Description=AMD Radeon (TM) R9 380 Series
I swear the game looks great...
better than I remember it--hard to believe how good it looks without using a more advanced D3d renderer--GOG absolutely has to have tinkered a bit--no complaints here! Game including textures renders sweet in 32-bits (contrasted with 16-bits for GLIDE.) Well, while GLIDE has remained frozen in a stasis since around 2000 or so (last 15 years), D3d has improved by leaps and bounds. It's certainly true that prior to DX7, GLIDE was far ahead of D3d in rendering quality & performance, but DX7 was the version that hit parity with GLIDE, but even 3dfx, before they went belly up (and were cannibalized by nVidia), had publicly dumped GLIDE in favor of D3d. No question but that D3d is the way to run the game now, at least with the version GOG is now selling. (I'm running Win10x64, build 10586.)