Integrate Sdl extension

[davidnurdin]

Hi , nice work !
Do you think it's possible to integrate : https://github.com/Ponup/php-sdl ?
(I mean the sdl function should redirect to canvas)

I'm pretty sure that sdl in C/C++ work in wasm

Thanks to you

[jasalt]

There was something SDL related new development going on according to Discord, here's a screenshot of a video from there.