RuntimeError when encoding to UASTC with WASM

Description

Windows Version 10.0
Clone the current state (this commit at the time of writing this)
Clone the current emsdk (this commit at the time of writing this)
Use LLVM version 12.0.0 (if that matters)
Run the emsdk_env.bat to set up the PATH
Compile the encoder, as described in the webgl/encoder/README.md The result will be the basis_encoder.js and wasm files, attached here for reference: basis_encoder-build.zip
Serve the /webgl directory with a local server
Visit http://localhost:..../encode_test/
Select the UASTC check box
Hit 'Encode!'

The console shows

basis_encoder.wasm:0x36da2 Uncaught RuntimeError: memory access out of bounds
    at basis_encoder.wasm:0x36da2
    at basis_encoder.wasm:0x282a3
    at basis_encoder.wasm:0x14223
    at basis_encoder.wasm:0xb0c
    at basis_encoder.wasm:0xd7983
    at basis_encoder.wasm:0xd72a5
    at ClassHandle.BasisFile$getFileDesc [as getFileDesc] (eval at newFunc (basis_encoder.js:8:81985), <anonymous>:8:10)
    at dumpBasisFileDesc ((index):160:33)
    at dataLoaded ((index):230:3)
    at PNGDataLoaded ((index):471:3)

This happens on Chrome 116.0 and FireFox 117.0, and the same error appears when using the build output in Node.js, so it seems to be a general issue.

Possible solution

After a bunch of trial and error, I stumbled over https://github.com/emscripten-core/emscripten/issues/19268#issuecomment-1544298860 , and after changing the LINK_FLAGS in the CMakeLists.txt to include the STACK_SIZE like this...

LINK_FLAGS "--bind -s ALLOW_MEMORY_GROWTH=1 -O3 -s ASSERTIONS=0 -s INITIAL_MEMORY=299958272 -s MALLOC=emmalloc -s MODULARIZE=1 -s EXPORT_NAME=BASIS -s STACK_SIZE=10MB")

... the problem no longer appears.

If others confirm that this makes sense (or add details, like which other size than 10MB might be more appropriate), I can create a corresponding PR.

BinomialLLC / basis_universal

RuntimeError when encoding to UASTC with WASM #356

Description

Possible solution