Emscripten + GZDoom = WASM for a Web Browser, but I'm stuck

[Jay0]

(and if you wish to upstream any of the emscripten support changes, feel free to open a PR - contributions are always welcome)

[drfrag]

Wenas. Yeah i didnt realize it was that until today. I mentioned it here:
viewtopic.php?p=1264574#p1264574

[ololoken]

Jay0, drfrag, thanks a lot!
Well, I'm not sure about PR. It's told that zdoom officially supports only 64-bit platforms, and wasm64 isn't working everywhere yet https://caniuse.com/wf-wasm-memory64.

[Rachael]

One thing I have learned over the years with development - if you need something like that but it is not provided everywhere - the best thing to do is go full steam ahead with the new requirements.

A) Over time, support comes in anyway
B) It also helps incentivize developers of the platforms missing the features you need, to go ahead and provide them.

One thing that factors into that calculation is that a lot of desktop browsers and a few of the key mobile browsers do already provide it. From what I can see it is already quite accessible with many platforms as it is.

[ololoken]

Done https://github.com/UZDoom/UZDoom/pull/848

[milpool]

ololoken do you have build instructions? I'm having some trouble getting it to build with emscripten

[Cake Logic]

I am having a hard time trying to get emcmake to see my SDL2 libraries. How are you meant to compile and link SDL2 to your libraries?
Platform: Windows
Compiler: Emscripten Cmake
Command Used in CMD:
emcmake cmake .. -G "MinGW Makefiles" -DHAVE_VULKAN=OFF -DHAVE_GLES2=ON -DDYN_OPENAL=OFF -DBUILD_SHARED_LIBS=OFF -DHAVE_VM_JIT=OFF -DNO_GTK=ON -DDYN_GTK=OFF -DNO_OPENAL=OFF -DDYN_SNDFILE=OFF -DDYN_MPG123=OFF

Error:
CMake Error at C:/Program Files/CMake/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:290 (message):
Could NOT find SDL2 (missing: SDL2_LIBRARY SDL2_INCLUDE_DIR)
Call Stack (most recent call first):
C:/Program Files/CMake/share/cmake-4.3/Modules/FindPackageHandleStandardArgs.cmake:654 (_FPHSA_FAILURE_MESSAGE)
cmake/FindSDL2.cmake:166 (FIND_PACKAGE_HANDLE_STANDARD_ARGS)
src/CMakeLists.txt:135 (find_package)

[bootnet]

I discovered this post midway through my own journey of trying to do the same. Got a working build pipeline together. Figured I'd drop it here in case it's useful. I myself just wanted an easy way to host and play doom mods directly from my browser.

Live: https://uzdoom.bootnet.io/
Repo: https://github.com/abootnet/uzdoom-wasm

There's a Docker image if you just want to run it (ghcr.io/abootnet/uzdoom-wasm:latest), and auto-setup scripts for Linux and Windows if you want to build from source.

Freedoom 1 and 2 play with sound and saves. Heavy ZScript mods like Brutal Doom and Ashes partially work; a full compat pass is the next target.

A note on tooling: I used Claude Code for much of the implementation, with architecture and testing on my side. I know the org's position on LLM contributions, which is why this is a standalone fork and not a PR against UZDoom.