Verified other direct3d games rendered without artifacts. Also, half-life in opengl mode ran at playable speeds without any artifacts nor instability. Same for UT99 in glide mode. With the improved framebuffer, glide mode seemed to run faster than previously, so the attached image is at medium graphical settings along with dynamic lighting. Not shown, but rogue spear had no artifacts either under d3d mode, but ran slow as expected because of its steeper cpu requirements.

I should mention a real Voodoo card can't run Half-Life's Direct3D mode at all. Just FYI incase you're sidetracked to fix D3D on HL, because it should not work.

Thanks for the information. I did previously try, perhaps a few times, its d3d mode prior to opengl. 😀 I think the glide sdk tests are sufficient for my case. Also, I had wondered about the video memory requirements of the software renderer versus the direct3d renderer in similar d3d6 games.

Attached an updated patch (which requires testing). This version does not have a fixed display resolution in a window while in V1 hardware emulation mode. The other resolutions are now available which may be displayed full screen.

This updated patch includes improvements to the V1 emulation (courtesy of the mame project).