MSAA doesn't apply inside textures on Steam Deck

[krittinen]

PsyDoom on Steam Deck doesn't apply antialiasing inside textures, resulting in jaggies in texture surfaces even at 8x MSAA.

Steam Deck 2560x1440 8xMSAA

On Windows with a 3060 Ti and 560.81 drivers 8x MSAA applies inside textures, resulting in a much more temporally stable image.

3060 Ti 2560x1440 8xMSAA

I assume this must be some Mesa vs Nvidia drivers thing, if it's not fixable then I suggest implementing a downscaling filter for resolutions higher than native, in order to use the internal resolution setting for supersampling. FWIW the Steam Deck has no issues running PsyDoom at 1440p so downscaling from there to 720p for effective 2x Supersampling would work very well.