Embed Godot in .NET, Run C# in the Browser (2dog.dev)

submitted 6 days ago* (last edited 6 days ago) by jupiter@programming.dev to c/godot@programming.dev

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I needed a way to embed Godot in .NET applications, and ended up facilitating HTML5 export for C# games, too, which really reinvigorated my passion for Godot in game jams. And for boring work, I needed parallel unit testing (across multiple ALCs).

But what is it...? I call it a C# front-end for the Godot engine, but really...

2dog is still Godot

All the Godot goodness still works, including programming with GodotSharp (their official C# SDK) and the 4.7 official editor, which was important to me for stability and trust (also, easier to swap out or extend).

The nuget packages are free and libre open source under the MIT license. 2dog uses libgodot and creates a choice of small .NET "host" applications that you can tailor to your needs - HTML5 browser export, embedding in WinForms, xUnit testing, etc.

Still hot off the press, always happy about visitors to the ⤜outfox⤏ discord or issues on our GitHub.

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[-] jupiter@programming.dev 4 points 5 days ago* (last edited 5 days ago)

Oof, looks like a Godot crash, do you have a public repo with the game jam entry somewhere? I probably have to dig a little deeper, my suspicion is something related to some kind of native function/trampoline being completely missing. (weird)

You could also try to create a source map: dotnet publish -c Release -p:WasmEmitSymbolMap=true -p:WasmNativeStrip=false

[-] domi@lemmy.secnd.me 3 points 5 days ago

We started in Forward+ rendering so it is definitely possible that something went wrong when switching to Compatibility renderer. I did a blank test project and everything went fine so it must be something related to the project.

do you have a public repo with the game jam entry somewhere?

Yes! It's open source and I made a branch with the renderer switched to Compatibility and our water shader removed (incompatible with Compatibility renderer). Should be able to just add 2dog right away and run it. (The regular desktop build runs fine)

You can find it here: https://gitlab.com/gmtk26zbandco/gmtk26-godot-game/-/tree/web-build

You could also try to create a source map: dotnet publish -c Release -p:WasmEmitSymbolMap=true -p:WasmNativeStrip=false

I added the source map and the stack trace looks more usable now:

Full error

[MONO] /__w/1/s/src/runtime/src/mono/mono/mini/aot-runtime-wasm.c:188 <disabled>
Mc<@wasm_native_to_interp_GodotSharp_Godot_Bridge_ScriptManagerBridge_CreateManagedForGodotObjectScriptInstance (http://127.0.0.1:8000/_framework/dotnet.runtime.js:3:172284
dotnet.native.wasm.wasm_trace_logger@:wasm-function[161353]:0x283a3f9
dotnet.native.wasm.eglib_log_adapter@:wasm-function[148375]:0x2640662
dotnet.native.wasm.monoeg_g_logv_nofree@:wasm-function[148280]:0x263e7bf
dotnet.native.wasm.monoeg_g_log@:wasm-function[148282]:0x263e88f
dotnet.native.wasm.monoeg_g_log_disabled@:wasm-function[148283]:0x263e8c4
dotnet.native.wasm.mono_wasm_get_interp_to_native_trampoline@:wasm-function[151868]:0x26f0907
dotnet.native.wasm.ves_pinvoke_method@:wasm-function[147551]:0x261556b
dotnet.native.wasm.mono_interp_exec_method@:wasm-function[147539]:0x260893b
dotnet.native.wasm.mono_thread_info_current@:wasm-function[148504]:0x26446fb
dotnet.native.wasm.interp_throw_ex_general@:wasm-function[147541]:0x26149c6
dotnet.native.wasm.mono_interp_exec_method@:wasm-function[147539]:0x2608867
dotnet.native.wasm.interp_runtime_invoke@:wasm-function[147589]:0x261680e
dotnet.native.wasm.mono_jit_runtime_invoke@:wasm-function[151658]:0x26e159e
dotnet.native.wasm.do_runtime_invoke@:wasm-function[150592]:0x26aff97
dotnet.native.wasm.mono_runtime_invoke_checked@:wasm-function[150591]:0x26aff53
dotnet.native.wasm.mono_runtime_try_invoke_byrefs@:wasm-function[150687]:0x26b5306
dotnet.native.wasm.ves_icall_InternalInvoke@:wasm-function[149718]:0x268592e
dotnet.native.wasm.ves_icall_InternalInvoke_raw@:wasm-function[149814]:0x2689e7b
dotnet.native.wasm.do_icall@:wasm-function[147637]:0x26189f1
dotnet.native.wasm.do_icall_wrapper@:wasm-function[147549]:0x261538f
dotnet.native.wasm.mono_interp_exec_method@:wasm-function[147539]:0x2608835
dotnet.native.wasm.mono_assertion_message_disabled@:wasm-function[148285]:0x263e908
dotnet.native.wasm.ftnptr_to_imethod@:wasm-function[147548]:0x2615271
dotnet.native.wasm.mono_interp_exec_method@:wasm-function[147539]:0x2608764
dotnet.native.wasm.interp_entry@:wasm-function[147626]:0x261817a
dotnet.native.wasm.interp_entry_static_ret_4@:wasm-function[147665]:0x26198f5
dotnet.native.wasm.wasm_native_to_interp_GodotSharp_Godot_Bridge_ScriptManagerBridge_CreateManagedForGodotObjectScriptInstance@:wasm-function[161284]:0x2838975)
dotnet.native.wasm.CSharpScript::_create_instance(Variant const**, int, Object*, bool, Callable::CallError&)@:wasm-function[105210]:0x1bfe612
dotnet.native.wasm.CSharpScript::instance_create(Object*)@:wasm-function[105221]:0x1c012a3
dotnet.native.wasm.Object::set_script(Variant const&)@:wasm-function[137662]:0x2419e21
dotnet.native.wasm.SceneState::instantiate(SceneState::GenEditState) const@:wasm-function[42805]:0xa44c80
dotnet.native.wasm.PackedScene::instantiate(PackedScene::GenEditState) const@:wasm-function[42808]:0xa46e43
dotnet.native.wasm.Main::start()@:wasm-function[133508]:0x230c7e8
dotnet.native.wasm.GodotInstance::start()@:wasm-function[134260]:0x232b9bc
dotnet.native.wasm.MethodBindTR<bool>::ptrcall(Object*, void const**, void*) const@:wasm-function[137157]:0x23ff93a
dotnet.native.wasm.gdextension_object_method_bind_ptrcall(void const*, void*, void const* const*, void*)@:wasm-function[87320]:0x14f1f59
dotnet.native.wasm.do_icall@:wasm-function[147637]:0x26189d3
dotnet.native.wasm.do_icall_wrapper@:wasm-function[147549]:0x261538f
dotnet.native.wasm.mono_interp_exec_method@:wasm-function[147539]:0x2608835
dotnet.native.wasm.interp_runtime_invoke@:wasm-function[147589]:0x261680e
dotnet.native.wasm.mono_jit_runtime_invoke@:wasm-function[151658]:0x26e159e
dotnet.native.wasm.do_runtime_invoke@:wasm-function[150592]:0x26aff97
dotnet.native.wasm.mono_runtime_invoke_checked@:wasm-function[150591]:0x26aff53
dotnet.native.wasm.mono_runtime_try_invoke_byrefs@:wasm-function[150687]:0x26b5306
dotnet.native.wasm.ves_icall_InternalInvoke@:wasm-function[149718]:0x268592e
dotnet.native.wasm.ves_icall_InternalInvoke_raw@:wasm-function[149814]:0x2689e7b
dotnet.native.wasm.do_icall@:wasm-function[147637]:0x26189f1
dotnet.native.wasm.do_icall_wrapper@:wasm-function[147549]:0x261538f
dotnet.native.wasm.mono_interp_exec_method@:wasm-function[147539]:0x2608835
dotnet.native.wasm.interp_runtime_invoke@:wasm-function[147589]:0x261680e
dotnet.native.wasm.mono_jit_runtime_invoke@:wasm-function[151658]:0x26e159e
dotnet.native.wasm.do_runtime_invoke@:wasm-function[150592]:0x26aff97
dotnet.native.wasm.mono_runtime_try_invoke@:wasm-function[150601]:0x26b0803
dotnet.native.wasm.mono_runtime_invoke@:wasm-function[150637]:0x26b2ce0
dotnet.native.wasm.mono_wasm_invoke_jsexport@:wasm-function[161345]:0x2839f50
createDotnetRuntime/Module._mono_wasm_invoke_jsexport@http://127.0.0.1:8000/_framework/dotnet.native.js:14520:195
wn@http://127.0.0.1:8000/_framework/dotnet.runtime.js:3:29440
Vc/<@http://127.0.0.1:8000/_framework/dotnet.runtime.js:3:178845
Vc@http://127.0.0.1:8000/_framework/dotnet.runtime.js:3:178996
async*Godot/Module.callMain@http://127.0.0.1:8000/godot.js:70:37
SafeEngine/start/Engine</</<@http://127.0.0.1:8000/godot.js:894:24
promise callback*SafeEngine/start/Engine</<@http://127.0.0.1:8000/godot.js:893:25
SafeEngine/start/Engine<@http://127.0.0.1:8000/godot.js:886:13
promise callback*start@http://127.0.0.1:8000/godot.js:865:22
SafeEngine/startGame/Engine<@http://127.0.0.1:8000/godot.js:932:22
promise callback*startGame@http://127.0.0.1:8000/godot.js:931:8
@http://127.0.0.1:8000/:146:24
@http://127.0.0.1:8000/:161:10
logging.ts:129:25

Thanks for taking the time!

[-] jupiter@programming.dev 5 points 5 days ago* (last edited 5 days ago)

Awesome, thanks for the detailed report and prepared repository to reproduce in. ~~The failure is a bit different on my end - first I get a bunch of issues trying to serve the blender files (which it shouldn't, on the web, very likely my bug! bad dog, bad dog... - should already be imported), and then I get your crash. Is this what you get, too?~~

Game seems to run okay in the editor. I'm working on making the blender import happen correctly or raise an error during the 2dog import step, ~~I think this is where it goes wrong. (also, fantastic test case for future tests... I built 2dog because of resource import issues, now resource import bites me in the belly yet again, ha.)~~

Edit: No, the problem is not the missing blender import, after correctly setting it to my blender path I get your behaviour. Which is great, only need to find the missing native trampoline now...

[-] jupiter@programming.dev 2 points 5 days ago* (last edited 5 days ago)

Getting closer, it's GD.PushError and some other functions with 7 parameters under the hood. (a little confused why these aren't generated, or how the native equivalent to GD.PushError("Blah") has 7 params, maybe it tries to look up all candidates) ... I need to do something else for the next hour or so, and then can get back to this. My automated and manual tests always fail on errors so ironically that led to GD.PushError never being tested.

In related news, who ever in the .NET/mono team thought it was a good idea to call native signature strings "cookies" in the context of WASM specifically deserves a villain award... I navigated away from the documentation page three times thinking it was about web cookies.

[-] domi@lemmy.secnd.me 2 points 5 days ago

Awesome! Let me know if you need anything else and feel free to keep the project around as test case.

I think Godot converts the Blender files internally so good to hear that it works now with the path set.

this post was submitted on 27 Jul 2026

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