emuThree issue with rendering shadows (Possibly caused by MoltenVK flag)

[yippeeeyay]

Hi, I hope you are doing well.
I recently reported another issue with MoltenVK related to Metal Argument Buffers, and I am glad that it is now fixed with that flag disabled and most games render perfectly now.

However, I have noticed another issue which only happens in select games like Super Mario 3D Land (Only happens with 3.0.3). The shadows will render with solid black lines instead of being transparent.
Example:

Changing the HW renderer settings or other settings do not fix this, but I think I know the culprit of the issue.
Recently you enabled private APIs for MoltenVK (MVK_CONFIG_USE_METAL_PRIVATE_API). I think this causes the shadow graphical glitches in select games.

Folium had this exact issue (shadows being rendered wrong) in Folium v1.3, and the developer stated it was due to private apis being enabled in his MoltenVK build:
https://x.com/antique_codes/status/1799043475276792261
He later fixed this in Folium v1.4 and above.

If you could test this game with MVK_CONFIG_USE_METAL_PRIVATE_API=0 and see if it fixes the shadow issue, that would be great.

[JoeMatt]

Fixed in next release