Starting to multithread with WebAssembly.

very early wip demo:

Siiiick I'm curious are there things they can be sped up with multi threaded WASM that might not be candidates for WebGPU parallelization?

my main ideas are adaptive particle resolution to give the surface more detail, and using multiple resolutions of grids like a coarser one to help improve incompressibility. CPU has more flexibility to do stuff like that though it is possible on GPU as well. also have some visual plans to work the GPU.

cool! any tips/learnings on multithreading for webassembly?

to prep, i cut down on communication between threads by going with coarser simulation sections. it does get a little unbalanced when the water is pushed along the edges. with single threaded wasm i like to call the simulation step from JS where i can do a lot of custom stuff. seems to be either a lot of overhead or latency though when multithreaded so will need to investigate that further. on iOS, using shared memory will make your stuff prone to out of memory errors.

I'm using Emscripten to compile my C++ to Wasm. I use the taskflow library to do Pthreads based multithreading. Also of interest is the Wasm Workers API, which might give both smaller build sizes and control for optimization.

@Pancracio9001 wasm

Amazing work. I was just reading about the math behind water sims in an old NVIDIA GPU gems book

crazy how PCs have had multithreading since 2002 yet its still nurfed in many browsers