Add a glutin example for Android

[wbigger]

I am trying to use android_glue to show something on the screen, but I am quite confused, since I cannot find any working example.

I tried to run the glutin example on top of the basic example in this repository, it compiles (wonderful!) but I get the following error at runtime:

thread 'main' panicked at 'not yet implemented', /Users/claudio/.cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/glutin-0.9.2/src/api/egl/mod.rs:497

The problem seems to be in the line:

let gl_window = glutin::GlWindow::new(window, context, &events_loop).unwrap();

It sounds perfectly reasonable since in Android we do not want to make a new window, but to use the already existing activity. I tried to play a bit with android_glue::get_native_window() but without success.

This is the project I am using for these tests: basic.zip

BTW, my final goal is to run Piston on Android!

[tomaka]

This is unfortunately a known issue. It should work if you call something like context.with_gl(GlRequest::Specific(Api::OpenGlEs, (3, 0))).

Basically what's unimplemented! is detecting which OpenGL version to use.

[wbigger]

It works, thanks! May I add this example to this repo?

[tomaka]

I don't think it's worth creating a new example. The proper thing to do ultimately would be to fix the problem so that all the examples just work.

[wbigger]

OK. I managed to compile the window.rs example from glutin repo within Android, but at the moment I get a black screen.

I copied test_gl_bindings.rs directly in the support module, to make it visibile to the module.

Can I contribute to fix something? I work with Rust and opengl but I am not an expert on either of them, but I'd like to help if I can.

[tomaka]

@wbigger Try running adb logcat (adb is an utility from the Android SDK, you can also do cargo apk logcat). This will show you the logs of the Android device. See if anything is wrong.
Any interesting message will contain RustAndroidGlueStdouterr, so you can try adb logcat | grep RustAndroidGlueStdouterr.

[torkleyy]

Related: rust-windowing/glutin#861