Emscripten - cannot enlarge memory arrays

[hcomere]

Hello,

I have generated bgfx for emscripten using "genie --gcc=asmjs gmake" command then i have built metaballs sample using "mingw32-make -C .build/projects/gmake-asmjs config=release example-02-metaballs" command.
Here metaballs sample runs fine.

Now i have copy-pasted the metaball source code to an external project which uses CMake. I link to .build/asmjs/bin/libbgfxRelease.a and .build/asmjs/bin/libexample-commonRelease.a and all compile well with emscripten.
But when i run the sample, i get the following error :

" Cannot enlarge memory arrays. Either (1) compile with -s TOTAL_MEMORY=X with X higher than the current value 16777216, (2) compile with ALLOW_MEMORY_GROWTH which adjusts the size at runtime but prevents some optimizations, or (3) set Module.TOTAL_MEMORY before the program runs. "

I added some traces and the error happens when i reach :
bool bgfx::init(...)
{
[....]
s_ctx = BX_ALIGNED_NEW(g_allocator, Context, 16);
}

A sizeof(Context) indicates 19839040 which is higher thant 16777216 indicated by the error message.

Is there any flag setted by genie about memory when it generates the asmjs project ?
Have you any idea about the issue ?

Regards,
Harold

[bkaradzic]

This has nothing to do with bgfx. You have to setup your CMake configuration for Emscripten correctly, you probably missing finalize step:
https://github.com/bkaradzic/bx/blob/master/scripts/toolchain.lua#L1112

[hcomere]

Yup, sorry for the off-topic :) I just do not know how to send to you a private message or a simple email .
Adding "-s TOTAL_MEMORY=268435456 " fix the issue, thanks !

Strangely, if i try to add "-s ALLOW_MEMORY_GROWTH=1 " the frame time of metaballs sample increases from 16 to ~40 ... This flag seems to drop some optimisations.

Thank you,

Regard,
Harold

[bkaradzic]

Yeah, behavior is documented in Emscripten:
https://kripken.github.io/emscripten-site/docs/optimizing/Optimizing-Code.html#memory-growth