Hi,

We've started to play this game on a Linux laptop with an nvidia GPU: https://store.steampowered.com/app/255870/PixelJunk_Shooter/

While it crashed a few time it was overall playable. As with a lot of Linux games of that time period (~10 years old), it shipped with its own version of libSDL2 which has to be deleted because it's incompatible with modern systems.

However, when trying to run the game on my main PC with an AMD GPU, that's not enough. While the game starts, it only shows a black screen, even though audio and control responsiveness suggest that the game itself should be working. If you wait for a bit, the game goes into "preview" mode, showing a few of the levels - which are very broken, entire sections of the map (rock, fluids, enemies) have vanished, the game is cleary missing some resources. According to the internet, the game uses the GPU for parts of the game logic, and apparently on nvidia hardware this still works, not so much on the AMD side. Which is weird, because it's OpenGL and hence should behave the same on both?

There are a two obvious solutions:

- Just continue playing on the laptop (valid, it's probably what we'll be doing)
- Use Proton

The weird thing with Proton is that while it runs flawlessly, the savegames don't seem to be cross platform. They have the same name and size and look identical on Linux and "Windows", but they are just not recognized in their counterpart versions, even after double and triple checking their correct save locations.

In any case, this has become more of a "science project" because it'd be really interesting to find out what causes this behavior. Not expecting a lot of answers because this a bit of an oddity, but wanted to try anhow, so thanks for anyone reading this and maybe dropping a few hints