add asyncify into gl_in_pthread.cpp

[spoon-vertiv]

So the gl_in_pthread.cpp never worked for me. it would always SNAP instantly to red instead of fade to red. It was only recently when I examined gl_in_proxy_pthread.cpp did I realize why. calls like this

while(emscripten_get_now() - now < 16) /no-op/;

were basically blocking the opengl updates from occuring? at least i think that's the reason. In order to fix this example for me you would only need to add the asyncify reference similar to the gl_in_proxy_pthread.cpp example... so

replace on line 55
double now = emscripten_get_now();
while(emscripten_get_now() - now < 16) /no-op/;

with this.
#if ASYNCIFY
emscripten_sleep(16);
#else
double now = emscripten_get_now();
while(emscripten_get_now() - now < 16) /no-op/;
#endif

and of course add the appropriate asyncify options to the test_browser.py .
-s ASYNCIFY -DASYNCIFY
somewhere....

This would fix the example for me and maybe help others?

[kripken]

Thanks @spoon-vertiv , good point.

Looks like it's run like this in the test suite:

self.btest('gl_in_pthread.cpp', expected='1', args=args + ['-s', 'USE_PTHREADS=1', '-s', 'PTHREAD_POOL_SIZE=2', '-s', 'OFFSCREENCANVAS_SUPPORT=1', '-lGL'])

So it is using OFFSCREENCANVAS_SUPPORT which maybe helps? If it does, we should add a comment in the source maybe. If it doesn't, then I agree it needs something like ASYNCIFY, and we should add a comment for that. A PR would would be great.

[stale]

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