How to generate a .wasm file when building

Unity Engine
,
1

Thought this would be a simple question but I’ve searched everywhere, save for posting here.

Anywho, trying to upload my game to Simmer.io, which requires a wasm file for uploading except no matter how I configure the build settings in Unity, I end up without a wasm file (I DO get a .asm file, however).

I’ve tried this with Unity 2020 1.3f1 and the latest version of Unity, and I have no idea what’s happening. In player settings, I did notice that I’m building based on WebGL 2.0 graphics API. I’ve searched around and can’t seem to figure this one out.

Heres the build output:

Here are my player settings:

6675859--764686--upload_2020-12-31_12-58-50.png
6675859--764686--upload_2020-12-31_12-58-50.png1197×586 20.7 KB

6675859--764689--upload_2020-12-31_12-59-20.png
6675859--764689--upload_2020-12-31_12-59-20.png1192×712 22.4 KB

6675859--764692--upload_2020-12-31_12-59-38.png
6675859--764692--upload_2020-12-31_12-59-38.png1192×171 7.26 KB

Hoping someone can help, thanks!

2

This is an example on how you can achieve it.

  • Create a folder “editor” in your assets folder
  • Create a C# script called WebAssemblyOption in the editor folder.
    Past this inside :
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

public class WebAssemblyOption
{
    [MenuItem("Web Assembly/Enable Threads Support")]
    static void EnableThreads()
    {
        PlayerSettings.WebGL.threadsSupport = true;
        ToggleActionValidate();
    }

    [MenuItem("Web Assembly/Disable Threads Support")]
    static void DisableThreads()
    {
        PlayerSettings.WebGL.threadsSupport = false;
        ToggleActionValidate();
    }

    [MenuItem("Web Assembly/Enable Wasm Only")]
    static void EnableWasm()
    {
        PlayerSettings.WebGL.linkerTarget = WebGLLinkerTarget.Wasm;
        WasmActionValidate();
    }

    [MenuItem("Web Assembly/Disable Wasm Only")]
    static void DisableWasm()
    {
        PlayerSettings.WebGL.linkerTarget = WebGLLinkerTarget.Both;
        WasmActionValidate();
    }

    [MenuItem("Web Assembly/Threads Support Active", false)]
    public static bool ToggleActionValidate()
    {
        Menu.SetChecked("Web Assembly/Threads Support Active", PlayerSettings.WebGL.threadsSupport);
        return true;
    }

    [MenuItem("Web Assembly/Wasm Only", false)]
    public static bool WasmActionValidate()
    {
        Menu.SetChecked("Web Assembly/Wasm Only", PlayerSettings.WebGL.linkerTarget == WebGLLinkerTarget.Wasm?true:false);
        return true;
    }

}

Compile and you will have a new menu in your unity called “Web Assembly” (where you have file,edit,assets ect …)
Click “Web Assembly/Disable Wasm Only” == > compile and you will have both .asm and .wasm

3

I have tried this and I get the following error:

Assets\Editor\WebAssemblyOption.cs(32,45): error CS0619: ‘WebGLLinkerTarget.Both’ is obsolete: ‘WebGLLinkerTarget.Both mode is no longer supported. Instead you can create separate asm.js and WebAssembly builds and download the appropriate one depending on the browser capabilities.’

4

You can force Unity to build both by editing this line in ProjectSettings.asset file in your Project/ProjectSettings folder:
webGLLinkerTarget: 2
0 = asm.js
1 = Wasm
2 = both

P.S. I am not sure, that it is still possible for Unity 2021+, because asm.js is deprecated from this version of Unity.

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