This should work for any linux native steam title that doesn't block LD_PRELOAD. Not all games will however be visible in the popup. Read Advanced if this is the case.

Tested games

Hearts Of Iron IV
Stellaris
PAYDAY 2

Usage

Download the latest release of Creamlinux.
Unzip it and copy the files to the game's directory
Set the game's steam launch params to CREAM_SIMPLE=1 sh ./cream.sh %command%.
If you have your own cream_api.ini, copy the DLC lines to Creamlinux's cream_api.ini in the game directory.
Launch your game and have fun!

Building from source

Clone the project recursively:

git clone https://github.com/20PercentRendered/creamlinux --recursive

build the project like any standard CMake project:

mkdir build
cd build
cmake ..
make

Copy build/lib folder contents to the game folder.
Then set the game's steam launch params to sh ./cream.sh %command%.
If you have your own cream_api.ini, copy the DLC lines to Creamlinux's cream_api.ini in the game directory.

Advanced

If you want to load cream_api.ini from a specific path, specify the path with CREAM_CONFIG_PATH in the launch options.

If the game you want to test isn't supported, use CREAM_GAME_NAME to specify the game executable's name.

CREAM_SIMPLE is used to skip the launcher popup. This variable may need to be removed for hoi4.

Credits

pulzed for mINI(ini.h)

Valve for steamworks

gabime for spdlog

goddeysfreya for hookey