This mod recompiles shaders on the fly when they change, giving you a live preview in-game
shaderswapper.mp4
I used Visual Studio 2022 on Windows, it requires my fork of Sewer's FlatOut 2 SDK
First, put dxStuff.dll in the game's directory, where FlatOut2.exe is
Then create a data folder, and in there create a shader folder, it should be set up just like in the BFS (If you are running the game unpacked, those folders should already be there)
All shaders under data/shader should now be recompiled when they change