Cannot Rendering and calling to Fetch API Sync in the main thread

[aharondavid]

For using in EMSCRIPTEN_FETCH_SYNCHRONOUS, we should link with: USE_PTHREADS, PROXY_TO_PTHREAD, ALLOW_MEMORY_GROWTH.
My main thread do the following:

1. GL rendering (that can be run only in the main thread as far as I understand).
2. calling to emscripten_fetch with EMSCRIPTEN_FETCH_SYNCHRONOUS.

The result:
emscripten_fetch successed.
Rendering is failed in its initialization.

The reason of failing, I supposed, it because that the rendering is pass to Worker thread due to the above linker flags.
so, what should I do in such case when the main thread do a rendering and others pthread calling

Version of emscripten/emsdk:
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.4 (14cd48e)
clang version 15.0.0 (https://github.com/llvm/llvm-project ce5588fdf478b6af724977c11a405685cebc3d26)
Target: wasm32-unknown-emscripten
Thread model: posix

[sbc100]

Have you looked into the OFFSCREENCANVAS_SUPPORT setting? I believe this is required if you want to render from a worker.

[aharondavid]

I will test it.
Thanks.

[Vindfjall]

Hi @aharondavid. I'm facing the same issue. Did you find any solution that worked?
If you used OFFSCREENCANVAS_SUPPORT, did you have to do something more except from setting that flag?
Thanks in advance!