IONIC WEBGL Out of memory on quit

DenisVidale · February 22, 2022, 2:10pm

Hi,
I’ve devloped an Ionic app which embed unity WEBGL build game. (2020+ version)
The unity loader.js script is embedded on Ionic app and the “game” is istanced from web.

const unityConfig: UnityConfig = {
codeUrl: this.exercise.URLWebGL + ‘/web.wasm.gz’,
dataUrl: this.exercise.URLWebGL + ‘/web.data.gz’,
frameworkUrl: this.exercise.URLWebGL + ‘/web.framework.js.gz’,
streamingAssetsUrl: ‘StreamingAssets’,
companyName: ‘’,
productName: ‘’,
productVersion: ‘’
};

await this.ngZone.runOutsideAngular(async () => {

this.unityInstance = await createUnityInstance(
document.querySelector(‘#unity-canvas’),
unityConfig,
(progress) => this.handleUnityProgress(progress)
);
});

The instance start correctly and work very well.
The problem is when I have to Quit the game.
When I call this.unityInstance.Quit() I get the following error on inspector:

Uncaught TypeError: Cannot read properties of null (reading ‘onwheel’)
at _emscripten_set_wheel_callback_on_thread (web.framework.js.gz:3:222957)
at MainLoop() (web.wasm.gz:0x889a5f)
at dynCall_v (web.wasm.gz:0xb9c8d8)
at browserIterationFunc (web.framework.js.gz:3:217614)
at callUserCallback (web.framework.js.gz:3:170812)
at Object.runIter (web.framework.js.gz:3:172072)
at Browser_mainLoop_runner (web.framework.js.gz:3:170347)
at l.invokeTask (polyfills-es2015.98a5e5b154a74c7172ec.js:1:7313)
at i.runTask (polyfills-es2015.98a5e5b154a74c7172ec.js:1:2722)
at invokeTask (polyfills-es2015.98a5e5b154a74c7172ec.js:1:8363)
at invoke (polyfills-es2015.98a5e5b154a74c7172ec.js:1:8265)
at n.args. (polyfills-es2015.98a5e5b154a74c7172ec.js:1:32237)

and than generate continuosly the following error

Uncaught RuntimeError: memory access out of bounds
at DynamicVBOBufferManager::CleanupClass() (web.wasm.gz:0x93c8e6)
at CallbackArray::Invoke() (web.wasm.gz:0x73d86)
at MainLoop() (web.wasm.gz:0x887f37)
at MainLoopUpdateFromBackground(void*) (web.wasm.gz:0xf68985)
at dynCall_vi (web.wasm.gz:0xb9c774)
at web.framework.js.gz:3:215820
at web.framework.js.gz:3:215841
at l.invokeTask (polyfills-es2015.98a5e5b154a74c7172ec.js:1:7313)
at i.runTask (polyfills-es2015.98a5e5b154a74c7172ec.js:1:2722)
at invokeTask (polyfills-es2015.98a5e5b154a74c7172ec.js:1:8363)
at invoke (polyfills-es2015.98a5e5b154a74c7172ec.js:1:8265)
at n.args. (polyfills-es2015.98a5e5b154a74c7172ec.js:1:32237)

do you have any idea?

DenisVidale · February 22, 2022, 2:23pm

I forgot to write that if I use a webbrowser and load the unity webgl webassembly I get no error.

If I use the IONIC browser app I get to same error reported before

vixper · February 23, 2022, 9:27am

Same error for me on an angular project.
No solution yet…

KamilCSPS · February 23, 2022, 5:56pm

It’s the same on React.

Bug report sent to Unity a -while- back.

See:
https://github.com/jeffreylanters/react-unity-webgl/issues/250

Will post again once I have a case # to get more traction going.

KamilCSPS · February 24, 2022, 1:14pm

@brendanduncan_u3d @anthony_b - for your attention as this affects Unity integration in SPA frameworks.

Case 1381853 was submitted by creator of Unity-React plugin - but they didn’t properly follow-up with QA and case was closed. Issue is a regression in 2021.2, happens in 2022.1 too.

Simply put - removing the canvas of a WebGL build (changing page thus removing the component in a single page application “SPA” ala React) will throw a JS error.

Before 2021.2, Unity would gracefully quit when canvas was destroyed - not anymore.

Grand_A · June 3, 2022, 9:53am

Any solution for this? This happened to me too after upgrading my project to Unity 2021.
Would be great if this issue can be fixed soon.

bkaraceylan · June 21, 2022, 8:58pm

Any news on this? It is a really annoying issue!

alexkuz_replika · June 22, 2022, 11:19am

Here’s a workaround for v2021.3.4f1 - add this to webgl.jslib:

mergeInto(LibraryManager.library, {
  // override default callback
  emscripten_set_wheel_callback_on_thread: function (
    target,
    userData,
    useCapture,
    callbackfunc,
    targetThread
  ) {
    target = findEventTarget(target);

    // the fix
    if (!target) {
      return -4;
    }

    if (typeof target.onwheel !== 'undefined') {
      registerWheelEventCallback(
        target,
        userData,
        useCapture,
        callbackfunc,
        9,
        'wheel',
        targetThread
      );
      return 0;
    } else {
      return -1;
    }
  }
});

tkslan · January 12, 2023, 6:11pm

Please take a look here, found solution: Unity 2021.2 build throws error when removing the canvas before invoking Quit on the Unity Instance · Issue #22 · jeffreylanters/react-unity-webgl · GitHub

KamilCSPS · January 12, 2023, 9:25pm

Super obscure but great find. Thanks!

Zigby · April 13, 2023, 12:58pm

alexkuz_replika:

Here’s a workaround for v2021.3.4f1 - add this to webgl.jslib:

mergeInto(LibraryManager.library, {
  // override default callback
  emscripten_set_wheel_callback_on_thread: function (
    target,
    userData,
    useCapture,
    callbackfunc,
    targetThread
  ) {
    target = findEventTarget(target);

    // the fix
    if (!target) {
      return -4;
    }

    if (typeof target.onwheel !== 'undefined') {
      registerWheelEventCallback(
        target,
        userData,
        useCapture,
        callbackfunc,
        9,
        'wheel',
        targetThread
      );
      return 0;
    } else {
      return -1;
    }
  }
});

After applying this no error messages are shown when creating and shutting down unity instances. So far so good. However after closing a unity instance where this code gets called with the target null and -4 is returned, then when opening a new unity instance I can no longer navigate with right mouse client and mouse move, instead a context menu is shown. From added console logging it seems that the registration of the registerWheelEventCallback is the working in the same way as the first callup. Anyone have a solution for that?

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IONIC WEBGL Out of memory on quit

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