How to create Nintendo Switch games with Unity.

Slluxx · Apr 21, 2023

ScyllaDwane said:
unless you look at the cached page from where that leak got posted from that site which got taken down by clicking the three bullet list on the google search page, but i won't tell or show the link here cause of piracy reasons.

I don't get what you want to say. The leak is everywhere if you know how to use Google. You can even find it in web.archive, and that surely won't get taken down.

rama_jecboom said:
So are there any ways to make unity read files in homebrew?

No. Official apps/nsp created with the sdk can not access the sdcard. Homebrews can because they are not limited by sdk restrictions. You can not use unity in homebrews though.

If you want to make a game as a homebrew, you can use Godot. There is a repo that lets you export Godot games as nro.

If you want to use unity and you have to read or store files, you have to read the documentation on how savegames work. You won't get sdcard access though.

pokewiz · May 2, 2023

Have you ever tried to build an AssetBundle?
I have build that for switch version.
But all sprites will go wrong when local play, and cannot be loaded on switch.

Slluxx · May 2, 2023

pokewiz said:
Have you ever tried to build an AssetBundle?
I have build that for switch version.
But all sprites will go wrong when local play, and cannot be loaded on switch.

No, did not try that. I have not tried it and i am just guessing but i would assume you have to put assetbundles in romfs and load them from there. I dont know how you have to write paths for it though, never tried it

pokewiz · May 2, 2023

You are right, I guess there might be something wrong with the path, I will try and share the correct way for build assetbundle here later.

CraftingHut · May 9, 2023

Hello there,

Do you reckon with enough research of how Unity compiles the shader code for the switch, we would be able to reverse engineer the shaders from built games BACK to shaderlab code?

Might sound like a dumb question, I apologize if it does and is, haha

NOOP9090 · Jun 10, 2023

masagrator said:
Jesus, no. You completely don't understand how this works.

No, you didn't. I recommend to read what this word means.

It stores whole game's code on Switch if there is no NRO file in romfs.

This file stores only strings and function signatures. It doesn't store any game's executable code.
Only two files can store CPU executable code on Switch - NSO and NRO. Nothing more.

You would need to write very comprehensive wrapper to replace any android specific data with something equivalent to HOS release + fix every possible serializing issue with romfs.

If you would know how executable is build, you wouldn't ask such question. Because you would know it would be a huge challenge worth years of work without any knowledge if this will work or not. That's why everybody with some experience does not do it without being handsomely paid.

You can't. You can only extract function signatures and strings to apply to disassembler.

I feel so much hype from your post and equivalent level of complete lack of knowledge.

I always find myself coming back to GBATemp to check out what's new once in a while and also because some of the people here are awesome. I used to share game hacks and lil proggies to edit games an such until one day I stopped, I still make them, and I still hack on stuff any time I can, but engaging with toxic trash like you made me decide to scan over forums and make quick touch downs like a UFO when needed and quickly move on. but reading your 1337est barf made me feel sad for you, you're probably really alone because you have such low self esteem you lash out at anyone and no-one wants you around so you find yourself online but cant control how you treat people here either.

One time I decrypted some things and then used them to leverage an exploit in a game I had UNPACKED.. but instead of using the word UNPACK I used decompile.. there were some people that were thankful and then there were some super lames like you that think being asinine on the internet is the best thing in the world, probably because you haven't experienced anything with a female yet. Imagine 20 years from now, none of these posts will matter, and everyone will have had a fun time learning and sharing and then there will be you, TidePod Timmy.... still alone, still an asshole...

masagrator · Jun 10, 2023

NOOP9090 said:
I always find myself coming back to GBATemp to check out what's new once in a while and also because some of the people here are awesome. I used to share game hacks and lil proggies to edit games an such until one day I stopped, I still make them, and I still hack on stuff any time I can, but engaging with toxic trash like you made me decide to scan over forums and make quick touch downs like a UFO when needed and quickly move on. but reading your 1337est barf made me feel sad for you, you're probably really alone because you have such low self esteem you lash out at anyone and no-one wants you around so you find yourself online but cant control how you treat people here either.

One time I decrypted some things and then used them to leverage an exploit in a game I had UNPACKED.. but instead of using the word UNPACK I used decompile.. there were some people that were thankful and then there were some super lames like you that think being asinine on the internet is the best thing in the world, probably because you haven't experienced anything with a female yet. Imagine 20 years from now, none of these posts will matter, and everyone will have had a fun time learning and sharing and then there will be you, TidePod Timmy.... still alone, still an asshole...

Wow, first post and wall of text. And I'm lonely? :rofl2:

NOOP9090 · Jun 10, 2023

masagrator said:
Wow, first post and wall of text. And I'm lonely?

this is my 9001th account.. yeah I have over nine thousand... anyhow, this account wont be logged into again. At least my wall-text wasn't me trying to compensate for being a lame.

RGeeK2 · Jun 30, 2023

hi, I created an empty project and tried to build it (I installed the sdk and everything), but I get this error:

the folder in question looks like that:

Slluxx · Jun 30, 2023

RGeeK2 said:
hi, I created an empty project and tried to build it (I installed the sdk and everything), but I get this error:
View attachment 380968
the folder in question looks like that:
View attachment 380969

I don't know french so I can't tell you what's wrong. But I can see that unity complains about the SDK version so you should fix that first before trying to compile something

RGeeK2 · Jun 30, 2023

it just means that the file can't be find

Post automatically merged: Jun 30, 2023

On the other hand, I don't understand: if I trust the first image you sent, the folders you have in your archive have exactly the same name and the same size as mine, so we have the same archive, but it's weird because you're in version 15.3.0 while I'm in version 15.3.2 with the same archive, did you replace files with another leak?

The documentation seems to indicate that there is no compatibility issue (I'm using Unity 2022.2.4f1)

I pwned U! · Jul 1, 2023

RGeeK2 said:
hi, I created an empty project and tried to build it (I installed the sdk and everything), but I get this error:
View attachment 380968
the folder in question looks like that:
View attachment 380969

I have had this same problem for a while, but unfortunately, I do not know how to fix it.

madcowbr · Jul 2, 2023

How do I get the Nintendo SDK for Unity? I already registered as a developer but I can't find it

RGeeK2 · Jul 2, 2023

madcowbr said:
How do I get the Nintendo SDK for Unity? I already registered as a developer but I can't find it

At first you only have access to software for the Wii U and 3DS, Unity is no longer distributed for these platforms, if you want to have access to switch software, you have to fill out a form but I tried and Nintendo declined it without further info.

Coolsonickirby · Oct 29, 2023

Yesterday I've decided to try and get into Unity Switch Building. I've ran into a few issues and managed to resolve them, so I'll be putting something akin to a "FAQ" (a PAQ if you will (for potentially asked questions

)) here.

Building Problems PAQ:

- Could not find <ProjectDir>\%NINTENDO_SDK_ROOT%\<SomePath>\Application_<stuff>.nmeta \ %NINTENDO_SDK_ROOT% is not set
For these 2 errors, I made sure to set the %NINTENDO_SDK_ROOT% environment variable, then restarted my computer. That fixed this issue.

- Building Library\Bee\artificats\AppPkg\<some id>\main.npdm failed with output: The system cannot find the path specified
This error took me a while to fix, but after snooping through everything, I managed to figure out the issue. You need to install the dotnet 6.0 SDK x64 (Make sure you reboot your computer after installing it.)

- Building Building Library\Bee\artifacts\SwitchPlayerBuildProgram\24pfd\GameAssembly.nso failed with output:
MakeNso INPUT=<nss path>, OUTPUT=<nso path>
An attempt was made to load a program with an incorrect format. (0x8007000B)
This issue comes from trying to use the x86 dotnet SDK. To fix it, make sure you download the x64 dotnet SDK, then re-order them in the PATH environment variable so that the x64 version is over the x86 (aka put the `dotnet` folder that's the child of `Program Files` over the `dotnet` folder that's the child of `Program Files (x86)` (picture example below)) and save it. After that, close all Unity instances and the Unity Hub, then re-open them and build the project.

Post automatically merged: Oct 29, 2023

Decompiled OP's executable back into a python script for those who want to be able to modify the repacking process / integrate it into a custom workflow / just doesn't trust random executables.

Python:

import os, sys, shutil, re

#region Setting up the global tools variable used for reference
tools = {
    "authoringTool": "%s/Tools/CommandLineTools/AuthoringTool/AuthoringTool.exe" % os.environ['NINTENDO_SDK_ROOT'],
    "hacPack": "hacpack"
}
#endregion

#region Getting the prod.keys file
prod_keys = os.path.join(os.environ['userprofile'], ".switch", "prod.keys")
if os.path.exists(prod_keys) == False:
    prod_keys = "prod.keys"
    if os.path.exists(prod_keys) == False:
        print("Could not find prod.keys!")
        exit()
#endregion

#region Setting up the NSP File variables
nsp_filePath = sys.argv[1] if len(sys.argv) > 1 else input("Enter the nsp filepath: ")
nsp_fileName = os.path.basename(nsp_filePath)
nsp_parentPath = os.path.dirname(nsp_filePath)
#endregion

#region Getting and setting up the Title ID variable
nsp_titleID = ""
search = re.search(re.compile('0100[A-Za-z0-9]{12}'), nsp_filePath)
if search == None:
    print("Could not find title ID anywhere in the path! Manual Entry Required.")
    nsp_titleID = input("Enter the NSP's title ID: ")
else:
    nsp_titleID = search.group()
    print("Found title ID in path! Title ID: %s" % nsp_titleID)
#endregion

#region Setting up the paths used for extracting
repacker_extract = os.path.join(nsp_parentPath, 'repacker_extract')
tmp_path = os.path.join(os.environ['temp'], "NCA")
#endregion

#region Cleaning up folders made before
shutil.rmtree(repacker_extract, ignore_errors=True)
shutil.rmtree(tmp_path, ignore_errors=True)
shutil.rmtree('hacpack_backup', ignore_errors=True)
#endregion

#region Running the authoring tool and getting the ExeFS and RomFS folders
os.makedirs(repacker_extract, exist_ok=True)
os.system(' '.join([tools["authoringTool"], "extract", "-o", '"%s"' % repacker_extract, '"%s"' % nsp_filePath]))
control_path = None
program_path = None
for x in os.listdir(repacker_extract):
    full_path = os.path.join(repacker_extract, x)
    if os.path.isfile(full_path):
        continue
    if os.path.exists(os.path.join(full_path, "fs0", "control.nacp")):
        control_path = full_path
    elif os.path.exists(os.path.join(full_path, "fs0", "main.npdm")):
        program_path = full_path
    if control_path != None and program_path != None:
        break
if control_path == None:
    print("Could not find control path!")
if program_path == None:
    print("Could not find program path!")
if program_path == None or control_path == None:
    exit()
#endregion

#region Extracting program to get the Program NCA
output = os.popen(' '.join([tools["hacPack"], '-k', '"%s"' % prod_keys, '-o', '"%s"' % tmp_path, '--titleid', nsp_titleID, '--type', 'nca', '--ncatype', 'program', '--exefsdir', '"%s/fs0"' % program_path, '--romfsdir', '"%s/fs1"' % program_path, '--logodir', '"%s/fs2"' % program_path])).read()
print(output)
tmp_program_nca_path = None
for line in output.splitlines():
    if '----> Created Program NCA:' in line:
        tmp_program_nca_path = line[len('----> Created Program NCA:') + 1:].strip()
        break
if tmp_program_nca_path == None:
    print("Failed getting the Program NCA!")
    exit()
#endregion

#region Extracting control to get the Control NCA
output = os.popen(' '.join([tools["hacPack"], '-k', '"%s"' % prod_keys, '-o', '"%s"' % tmp_path, '--titleid', nsp_titleID, '--type', 'nca', '--ncatype', 'control', '--romfsdir', '"%s/fs0"' % control_path])).read()
print(output)
tmp_control_nca_path = None
for line in output.splitlines():
    if '----> Created Control NCA:' in line:
        tmp_control_nca_path = line[len('----> Created Control NCA:') + 1:].strip()
        break
if tmp_control_nca_path == None:
    print("Failed getting the Control NCA!")
    exit()
#endregion

#region Creating Repacked NCA
os.system(' '.join([tools["hacPack"], '-k', '"%s"' % prod_keys, '-o', '"%s"' % tmp_path, '--titleid', nsp_titleID, '--type', 'nca', '--ncatype', 'meta', '--titletype', 'application', '--programnca', '"%s"' % tmp_program_nca_path, '--controlnca', '"%s"' % tmp_control_nca_path]))
#endregion

#region Creating Repacked NSP
output_nsp = "%s_repacked.nsp" % nsp_filePath[:nsp_filePath.rindex(".nsp")]
if os.path.exists(output_nsp):
    os.remove(output_nsp)
os.system(' '.join([tools["hacPack"], '-k', '"%s"' % prod_keys, '-o', '"%s"' % nsp_parentPath, '--titleid', nsp_titleID, '--type', 'nsp', '--ncadir', '"%s"' % tmp_path]))
os.rename(os.path.join(nsp_parentPath, "%s.nsp" % nsp_titleID), output_nsp)
shutil.rmtree(repacker_extract, ignore_errors=True)
shutil.rmtree(tmp_path, ignore_errors=True)
shutil.rmtree('hacpack_backup', ignore_errors=True)
#endregion

luzifix · Dec 26, 2023

Hi, I wrote a little post build script to streamline the build process. It will repack the nsp file and optionally launch it directly in Yuzu.

For this you need to set two env variables NINTENDO_HECPACK_REPACK_BINARY with the path to the repacker.exe from Slluxx. This will automatically repack all generated nsp files. The second optional env variable is NINTENDO_EMULATOR_BINARY which points to yuzu.exe to automatically start the build nsp in the yuzu emulator.

After setting up the env variable and restarting your PC, you will need to create a SwitchPostBuildScript.cs file in your project and paste this code into it.

C#:

#if UNITY_SWITCH
public class SwitchPostBuildScript : MonoBehaviour
{
    private const string ENV_PATH_HECPACK_REPACK = "NINTENDO_HECPACK_REPACK_BINARY";
    private const string ENV_PATH_EMULATOR = "NINTENDO_EMULATOR_BINARY";

    [PostProcessBuild(1)]
    public static void OnPostprocessBuild(BuildTarget target, string pathToBuiltProject)
    {
        if (target != BuildTarget.Switch)
            return;

        UnityEngine.Debug.Log("Repack NSP for retail switch");

        string hecPackRepackPath = Environment.GetEnvironmentVariable(ENV_PATH_HECPACK_REPACK);
        if (string.IsNullOrEmpty(hecPackRepackPath))
        {
            UnityEngine.Debug.LogError($"Environment variable {ENV_PATH_HECPACK_REPACK} is not set");
            return;
        }

        bool success = RunExternalExe(hecPackRepackPath, pathToBuiltProject);
        string emulatorPath = Environment.GetEnvironmentVariable(ENV_PATH_EMULATOR);

        if (success && !string.IsNullOrEmpty(emulatorPath))
        {
            UnityEngine.Debug.Log("Run yuzu.exe");
            var path = Path.GetDirectoryName(pathToBuiltProject);
            var fileName = Path.GetFileNameWithoutExtension(pathToBuiltProject);

            UnityEngine.Debug.Log($"Command: {emulatorPath} -f -g \"{path}\\{fileName}_repacked.nsp\"");
            Process.Start(emulatorPath, $"-g \"{path}\\{fileName}_repacked.nsp\"");
        }
    }

    private static bool RunExternalExe(string filename, string arguments = null)
    {
        var process = new Process();

        process.StartInfo.FileName = filename;
        if (!string.IsNullOrEmpty(arguments))
            process.StartInfo.Arguments = arguments;

        process.StartInfo.CreateNoWindow = true;
        process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        process.StartInfo.UseShellExecute = false;

        process.StartInfo.RedirectStandardError = true;
        process.StartInfo.RedirectStandardOutput = true;
        var stdOutput = new StringBuilder();
        stdOutput.AppendLine("=== NSP repack process log ===");

        process.OutputDataReceived += (sender, args) => stdOutput.AppendLine(args.Data);

        try
        {
            process.Start();
            process.BeginOutputReadLine();
            UnityEngine.Debug.Log(process.StandardError.ReadToEnd());
            process.WaitForExit();

            UnityEngine.Debug.Log(stdOutput.ToString());
        }
        catch (Exception e)
        {
            UnityEngine.Debug.Log(stdOutput.ToString());

            throw new Exception("OS error while executing " + Format(filename, arguments) + ": " + e.Message, e);
        }

        return process.ExitCode == 0;
    }

    private static string Format(string filename, string arguments)
    {
        return "'" + filename + ((string.IsNullOrEmpty(arguments)) ? string.Empty : " " + arguments) + "'";
    }
}
#endif

Pyoro_ · Dec 27, 2023

What do I do if my SDK is structured like this?

Coolsonickirby · Dec 27, 2023

Pyoro_ said:
View attachment 410528
What do I do if my SDK is structured like this?

Just make a `NINTENDO_SDK_ROOT` environment variable and set the value to be the path to that directory.

luzifix · Dec 27, 2023

Pyoro_ said:
What do I do if my SDK is structured like this?

I have the same structure and everything works fine. If you have problems, see the FAQ by Coolsonickirby three posts above.

Pyoro_ · Dec 27, 2023

Coolsonickirby said:
Just make a `NINTENDO_SDK_ROOT` environment variable and set the value to be the path to that directory.

This worked, thank you!

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