Adding support to compile to WebAssembly

[shahrodkh]

I have made additions to your Makefile to compile to a .wasm file instead of .asm
Some other minor changes had to be made so that it will compile.

[fta2012]

Cool I didn't know web assembly was ready!

Some comments:

• It's my fault that the make file isn't organized better but there should multiple sets of flags and build targets. They are not named but the existing grouping of flags are roughly mandatory, release, and debug (where the debug flags are currently commented out and aren't tested/used).
  • I am mentioning this because I recall docs saying that the flags you enabled (ASSERTIONS, ALLOW_MEMORY_GROWTH) will prevent certain optimizations so probably shouldn't be in the release build.
  • Likewise the -s WASM flag should probably be a target specific variable for a new wasm build target . Then you can have both the wasm and regular build and choose which to use depending on browser support
• What is the sed replacement for? I think there are callbacks like Module.preInit/preRun/postRun that you can hook into more cleanly if that's what you're going for. If that fails you can also add EM_ASM to the int main() in bindings to make it call your callback. But testing it out myself it seems like postRun will work.
• I don't like adding a completely new demo since you can't compare it with the non-wasm build. Also a quicker way to do a static webserver is sudo python -m SimpleHTTPServer 80 instead of adding a boilerplate express server.

I am glad you got the wasm working but overall I don't really like this change. If you can simplify it to just adding a new build target and adding wasm feature detection for the existing demo, then that would be okay with me!

I made some quick changes in f63c56c to reflect some of the issues I mentioned above. If you're still interested in doing so you can rebase and try adding the wasm target again.

Thanks!

[fta2012]

I don't think this case also needs to be commented out. There are no Uint64Array in js but there are Float64Array.

[fta2012]

Btw I changed it so that it will look for a global CCV variable to call CCVLib with (checkout index.html). I haven't tried this but you should be able to add your wasmBinary there too before loading the script:

// load your wasm
...
CCV = {
  wasmBinary: buffer,
  postRun: [ whatever ]
};
...
// load ccv.js 

[shahrodkh]

hey got caught up elsewhere -- looks like you made the changes though? hopefully I'll get a chance to check it out this weekend 👍