nv2a: Fix vertex Z calculation using clip range

[camden-smallwood]

As mentioned in this comment, this fix restores a number of missing UI elements in Halo 2 on Mac.

System Information

2020 M1 Mac mini
macOS 14.1.1

Fixed Behavior

Restored blue background on mainmenu:

Restored profile icons:

Restored UI elements:

[Spidy123222]

This Pr fixes other games also it seems like burnout 3's menus (pitch black for most part in xemu before). I will have to test this on my steam deck as it also has these issues as from what others saw that it mostly was on integrated graphics devices or certain AMD gpu's #1223.

[Spidy123222]

so I tested the pull request on steam deck. doesn't fix it there unfortunately.

[HadetTheUndying]

so I tested the pull request on steam deck. doesn't fix it there unfortunately.

Does the SteamDeck issue persist if you switch to zink as your GL driver? I have a feeling this is still that same mesa issue that we've been dealing with for over a year now.

[Spidy123222]

so I tested the pull request on steam deck. doesn't fix it there unfortunately.

Does the SteamDeck issue persist if you switch to zink as your GL driver? I have a feeling this is still that same mesa issue that we've been dealing with for over a year now.

Zink just breaks the graphics nowadays. Not sure why and this doesn't change that either. Both macOS and steam deck can be fixed and broken at same time with an environment variable that's not correct solution. As Matt said above the pr change could be wrong.

[ws141]

so I tested the pull request on steam deck. doesn't fix it there unfortunately.

Thanks for reporting I'm trying to get Burnout 3 going on my Steam Deck as well. ☹️

[Fabxx]

i've tested the first splinter cell with this PR, unfortunately you can still see through walls and objects