[WIP] Update steven for emscripten #1
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EMMAKEN_CFLAGS="-s USE_SDL=2" is used to enable the SDL2 port with emscripten, but it fails with a bizarre error: https://gist.github.com/satoshinm/7c5a7971d8c3b2bbf4fa62c9de8d85b2 seems it is trying to generate sdl2.bc multiple times simultaneously and choking on itself? To pregenerate sdl2.bc, try running from emscripten the unit test - this passes: 1.37.9 $ python tests/runner.py browser.test_sdl2_imageand then the SDL errors go away, we are left with only OpenSSL missing: |
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Stubbing out OpenSSL calls just to unblock building (port to ring?), starts to run but then quickly panics - thread-related?
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Enabling RUST_BACKTRACE for a more informative error, it mentions |
I think this error is trying to say it can't download the needed resources, around this function: https://github.com/Thinkofname/steven/blob/a9cb7654e45757b7219f4da5e6f709d0fa23f42a/src/resources.rs#L345 - unfortunately, not clear how to port this. The web platform cannot download arbitrary URLs cross-origin, yet the resources are mandatory. Setting this aside for now. |
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See some notes on challenges of completing this port in Thinkofname#70 (comment), in order of difficulty: sockets, crypto, threads. But even before porting, there is the difficulty of getting Steven up-to-date and functional on my system: Rust nightly is a moving target, what worked before may not work now, there's a bunch of warnings, it is not clear which are real problems, there is graphic corruption on the title screen, any login fails with "Invalid scheme for Http", and I don't know Rust to fix it.
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Invalid scheme for Http is caused by not supporting https when openssl is not used by hyper (http library) |
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@satoshinm iceiix/stevenarella#446 is further along using wasm32-unknown-unknown (had difficulties with wasm32-unknown-emscripten: https://users.rust-lang.org/t/what-is-a-known-working-setup-for-using-rust-with-emscripten-wasm32-unknown-emscripten/24312/4?u=iceiix, and the wasm32-unknown-unknown target is more popular / supported), although still a ways from being useful: web.mov |
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Compile for emscripten with:
EMMAKEN_CFLAGS="-s USE_SDL=2"OpenSSL, either build with emscripten or replace- commented-out for now