Nim Defold Naitive Extension

The Defoldmine
#1

dfnim

Nim Naitive Extension for defold

Creedits :

this work is based on the nice project nimLua

Install

game.project → project → dependecies → add this url

https://github.com/MhadhbiXissam/dfnim/archive/refs/tags/v1.0.6.zip

Get starts :

Create Extension :

after installing the extension select any file and left click mouse you will see Create Nim Extyension → click it .

this will create Nim Folder as follow :

Nim
├── BuildExt.py     <-- this to build the nim code 
├── LICENSE
├── Lua.nim         <-- this is Lua binding for nim 
├── MyExtension.nim <-- edit this file 
├── nim.manifest
└── README.md

1- Edit file MyExtension.nim

Note : do not change the name of the file cause it is point in build python file by the name , if you want so , change it in python file also with same name .

include Lua


# write you nim function 
proc add*( a : int , b:int ): int  = 
    return a + b*100


# create binding 
proc Luabinding_add(L : PState) :  cint {.cdecl,exportc,dynlib.} =
    let a = checkinteger(L , 1 )
    let b = checkinteger(L, 2)
    var y = add(a,b) + 1  - 1000
    pushinteger(L,y)
    return 1 


# this function is exposed to defld game engine , to register the module 
proc LuaInit*(L : PState) {.cdecl,exportc,dynlib.} = 
    var regs = [
        # here add the function and its name 
        luaL_Reg(name: "add", `func`: Luabinding_add),
        luaL_Reg(name: nil, `func`: nil)
    ]
    L.register("nim",regs)
    L.pop(1)

2- Build the nim code :
to build the nim code to be used in defold :

  • Left click mouse on MyExtension.nim in assests you will see build editor script .
    OR
  • run from shell
python BuildExt.py

3- Use you function from any where in your lua defold scipts :

    --- ....
    local result = nim.add(10,12)
    print(result) 
    --- ....
end
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