This mod use hook tech to obtain/modify game internal logic, can do things beyond the lua api. The game should boot with --luadebug parameter.
In most cases, lua can do everything, so there's no need to build. If you want to build the hook library, follow the steps below.
Use VS2022 open isaac-hook.sln, build with x86/Release.
If you build with X86/Debug, it is okay. A copy file may failed, you can fix the path for your game in ProjectSetthings or just ignore it.
Rename the isaac-hook.dll to isaac-hook.bin, and copy to the lib folder inside the mod.
Global variable IsaacHook is added.
Refer to: API, ConsoleCommands
The following lua program hijacks the internal function, and changes every item pool to Boss pool. Try spawn 5.100 and you will always get items from ROOM_BOSS.
IsaacHook.setHook(
IsaacHook.getFuncAddr(Game():GetItemPool().GetPoolForRoom),
function(r)
IsaacHook.writeInt32(r.esp+4, RoomType.ROOM_BOSS)
end
)