wasm: enable events loop #459

iceiix · 2021-01-01T18:13:21Z

Web has a separate render loop and window event loop, will need to handle both

#446 🕸️ Web support

iceiix · 2021-01-01T18:14:16Z

Enabling both fails due to use of moved values, will need to see how to share this state:

error[E0382]: use of moved value: `winit_window`
   --> src/main.rs:417:21
    |
263 |     let (context, shader_version, winit_window, render_loop) = {
    |                                   ------------ move occurs because `winit_window` has type `winit::window::Window`, which does not implement the `Copy` trait
...
403 |     render_loop.run(move |running: &mut bool| {
    |                     ------------------------- value moved into closure here
404 |         tick_all(
405 |             &winit_window,
    |              ------------ variable moved due to use in closure
...
417 |     events_loop.run(move |event, _event_loop, control_flow| {
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ value used here after move
...
438 |         if !handle_window_event(&winit_window, &mut game, &mut ui_container, event) {
    |                                  ------------ use occurs due to use in closure

error[E0382]: use of moved value: `game`
   --> src/main.rs:417:21
    |
363 |     let mut game = Game {
    |         -------- move occurs because `game` has type `Game`, which does not implement the `Copy` trait
...
403 |     render_loop.run(move |running: &mut bool| {
    |                     ------------------------- value moved into closure here
...
406 |             &mut game,
    |                  ---- variable moved due to use in closure
...
417 |     events_loop.run(move |event, _event_loop, control_flow| {
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ value used here after move
...
438 |         if !handle_window_event(&winit_window, &mut game, &mut ui_container, event) {
    |                                                     ---- use occurs due to use in closure

error[E0382]: use of moved value: `ui_container`
   --> src/main.rs:417:21
    |
337 |     let mut ui_container = ui::Container::new();
    |         ---------------- move occurs because `ui_container` has type `Container`, which does not implement the `Copy` trait
...
403 |     render_loop.run(move |running: &mut bool| {
    |                     ------------------------- value moved into closure here
...
407 |             &mut ui_container,
    |                  ------------ variable moved due to use in closure
...
417 |     events_loop.run(move |event, _event_loop, control_flow| {
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ value used here after move
...
438 |         if !handle_window_event(&winit_window, &mut game, &mut ui_container, event) {
    |                                                                ------------ use occurs due to use in closure

winit_window
game
ui_container

iceiix · 2021-01-02T18:21:00Z

Errors with this branch, first comes from winit:

Error importing `index.js`: Error: Using exceptions for control flow, don't mind me. This isn't actually an error!
    __wbindgen_throw webpack:///../pkg/stevenarella_bg.js?:1695
    __wbindgen_throw http://localhost:8080/bootstrap.js:755
    <anonymous> webpack:///./index.js?:5
    js http://localhost:8080/0.bootstrap.js:34
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    promise callback* webpack:///./bootstrap.js?:4
    js http://localhost:8080/bootstrap.js:989
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    <anonymous> webpack:///multi_(webpack)-dev-server/client?:2
    0 http://localhost:8080/bootstrap.js:1376
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    <anonymous> http://localhost:8080/bootstrap.js:977
    <anonymous> http://localhost:8080/bootstrap.js:980
bootstrap.js:5:23
    <anonymous> webpack:///./bootstrap.js?:5
    (Async: promise callback)
    <anonymous> webpack:///./bootstrap.js?:5
    js http://localhost:8080/bootstrap.js:989
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    <anonymous> webpack:///multi_(webpack)-dev-server/client?:2
    0 http://localhost:8080/bootstrap.js:1376
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    <anonymous> http://localhost:8080/bootstrap.js:977
    <anonymous> http://localhost:8080/bootstrap.js:980

https://github.com/rust-windowing/winit/blob/master/src/platform_impl/web/event_loop/mod.rs#L42-L46

        // Throw an exception to break out of Rust exceution and use unreachable to tell the
        // compiler this function won't return, giving it a return type of '!'
        backend::throw(
            "Using exceptions for control flow, don't mind me. This isn't actually an error!",
        );

if not actually an error, why is it logged in the browser console?

The screen renders, but if we click on it, then a panic:

[main.rs:437][INFO] events_loop start
panicked at 'called `Result::unwrap()` on an `Err` value: NotSupported(NotSupportedError)', src/main.rs:657:59

Stack:

__wbg_new_59cb74e423758ede<@webpack:///../pkg/stevenarella_bg.js?:616:15
logError/<@webpack:///../pkg/stevenarella_bg.js?:480:22
__wbg_new_59cb74e423758ede@http://localhost:8080/bootstrap.js:74:77
console_error_panic_hook::Error::new::h749adbfb5a41c4db@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[56268]:0x51c5bb
console_error_panic_hook::hook_impl::h4e610f50bd474f05@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[4675]:0x32126c
console_error_panic_hook::hook::h1342a448bddad9ae@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[56267]:0x51c5b5
core::ops::function::Fn::call::h0983a3994a81de28@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[55821]:0x51b6da
std::panicking::rust_panic_with_hook::h123718ba3bf480af@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[3284]:0x2daf22
std::panicking::begin_panic_handler::{{closure}}::hf393a82e58397bd2@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[5724]:0x34b177
std::sys_common::backtrace::__rust_end_short_backtrace::h2ff2cfc953878925@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[23624]:0x484d86
rust_begin_unwind@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[15706]:0x41d0dd
core::panicking::panic_fmt::h285dc015a87be5a4@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[23626]:0x484deb
core::option::expect_none_failed::hb95d2b1dc5448c17@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[6492]:0x364fda
core::result::Result<T,E>::unwrap::h679f17a6def43069@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[7968]:0x38d487
stevenarella::handle_window_event::h3f4fa933e11518d7@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[465]:0x13e808
stevenarella::main2::{{closure}}::h3bc87607d9e52d26@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[2289]:0x296372
winit::platform_impl::platform::event_loop::EventLoop<T>::run::{{closure}}::ha5512701e6e357bb@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[15733]:0x41d767
<alloc::boxed::Box<F,A> as core::ops::function::FnMut<Args>>::call_mut::h97dd8bb46ad2c2ea@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[13069]:0x3f3542
winit::platform_impl::platform::event_loop::runner::Runner<T>::handle_single_event::h45377ebc1f334d40@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[11462]:0x3d7d4e
winit::platform_impl::platform::event_loop::runner::Shared<T>::handle_event::h4fbde8547cfd50f3@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[1661]:0x25a5a3
winit::platform_impl::platform::event_loop::runner::Shared<T>::run_until_cleared::hf9f22998412e5a48@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[1229]:0x221802
winit::platform_impl::platform::event_loop::runner::Shared<T>::send_events::h5de814012e065709@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[982]:0x1f563b
winit::platform_impl::platform::event_loop::runner::Shared<T>::send_event::heec0a79aa3401608@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[16902]:0x42e7d6
winit::platform_impl::platform::event_loop::window_target::WindowTarget<T>::register::{{closure}}::h303b364ab7072391@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[7899]:0x38b9ce
winit::platform_impl::platform::backend::canvas::pointer_handler::PointerHandler::on_mouse_release::{{closure}}::haf62f63d0cac01a8@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[9233]:0x3aafa7
winit::platform_impl::platform::backend::canvas::Common::add_user_event::{{closure}}::hb24614961c048429@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[4724]:0x323568
winit::platform_impl::platform::backend::canvas::Common::add_event::{{closure}}::h4144a16a994eee89@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[15752]:0x41dbc5
<dyn core::ops::function::FnMut<(A,)>+Output = R as wasm_bindgen::closure::WasmClosure>::describe::invoke::hcb9e4ad21dd6fbd4@http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:wasm-function[26842]:0x4a6a03

src/main.rs:657 is window.set_cursor_grab(false).unwrap();, this isn't supported by winit on the web? Would have expected to translate to Pointer Lock API, but only when called from a click.

next error doesn't say much:

Uncaught Error: undefined b2ccb57aa171c84458ca.module.wasm:5428780:1

__rust_start_panic http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:5428780
    rust_panic http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4834776
    h123718ba3bf480af http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:2993995
    hf393a82e58397bd2 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3453303
    h2ff2cfc953878925 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4738438
    rust_begin_unwind http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4313309
    h285dc015a87be5a4 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4738539
    hb95d2b1dc5448c17 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3559386
    h679f17a6def43069 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3724423
    h3f4fa933e11518d7 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:1304584
    h3bc87607d9e52d26 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:2712434
    ha5512701e6e357bb http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4314983
    <alloc::boxed::Box<F,A> as core::ops::function::FnMut<Args>>::call_mut::h97dd8bb46ad2c2ea http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4142402
    h45377ebc1f334d40 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4029774
    h4fbde8547cfd50f3 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:2467235
    hf9f22998412e5a48 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:2234370
    h5de814012e065709 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:2053691
    heec0a79aa3401608 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4384726
    h303b364ab7072391 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3717582
    haf62f63d0cac01a8 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3846055
    hb24614961c048429 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3290472
    h4144a16a994eee89 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4316101
    <dyn core::ops::function::FnMut<(A,)>+Output = R as wasm_bindgen::closure::WasmClosure>::describe::invoke::hcb9e4ad21dd6fbd4 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4876803
    __wbg_adapter_39 webpack:///../pkg/stevenarella_bg.js?:528
    real webpack:///../pkg/stevenarella_bg.js?:462
    (Async: EventListener.handleEvent)
    __wbg_addEventListener_6a37bc32387cb66d webpack:///../pkg/stevenarella_bg.js?:1108
    handleError webpack:///../pkg/stevenarella_bg.js?:558
    __wbg_addEventListener_6a37bc32387cb66d http://localhost:8080/bootstrap.js:386
    h9c616ab62b0d36fb http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3547500
    h53b3d276cdb8e909 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3576940
    hcf6e0ce669b7387a http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3622698
    hbce29512fe5a0cde http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4010272
    h17982d7f71456822 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:3777362
    hc7927d2c27bb5c8d http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4651373
    hbfabf39b9bdeb249 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:2326509
    h7c01d24f30602758 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:2110453
    ha7dd479bc7d628a8 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:4049138
    heddadd9feacdeaa9 http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:1003636
    ha395fada26a8133c http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:5406833
    main http://localhost:8080/b2ccb57aa171c84458ca.module.wasm:5406839
    <anonymous> webpack:///./index.js?:5
    js http://localhost:8080/0.bootstrap.js:34
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    __webpack_require__ self-hosted:1208
    (Async: promise callback)
    <anonymous> webpack:///./bootstrap.js?:4
    js http://localhost:8080/bootstrap.js:989
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    <anonymous> webpack:///multi_(webpack)-dev-server/client?:2
    0 http://localhost:8080/bootstrap.js:1376
    __webpack_require__ http://localhost:8080/bootstrap.js:807
    <anonymous> http://localhost:8080/bootstrap.js:977
    <anonymous> http://localhost:8080/bootstrap.js:980

then this last error, most serious:

[main.rs:414][INFO] render_loop start
panicked at 'already borrowed: BorrowMutError', src/main.rs:415:45

when borrowing:

        render_loop.run(move |running: &mut bool| {
            info!("render_loop start");
            let winit_window = winit_window.borrow_mut();

meaning the events_loop started (then panicked-NotSupportedError), and then render_loop started and borrowed at the same time. Wasn't expecting both loops to be executing simultaneously — maybe they aren't but this simultaneous borrow_mut() is a consequence of events_loop panicking first?

iceiix · 2021-01-02T18:33:33Z

window.set_cursor_grab(false).unwrap() src/main.rs:657

winit has/had support for Pointer Lock API through emscripten: rust-windowing/winit@769d4fe

but it does not yet through web-sys, there is an open issue: rust-windowing/winit#1674

Pointer Lock is definitely needed. But on this line of code, it is actually trying to disable pointer grab. Commenting it out for testing, mouse events do work — including hover and click:

…nter Lock is available

This reverts commit 542fa1b.

…enough

error[E0716]: temporary value dropped while borrowed --> src/main.rs:332:24 | 332 | let winit_window = Box::leak(Box::new(glutin_window)).borrow().window(); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^---------- temporary value is freed at the end of this statement | | | creates a temporary which is freed while still in use | argument requires that borrow lasts for `'static` error[E0382]: use of moved value: `glutin_window` --> src/main.rs:437:21 | 330 | let glutin_window = RefCell::new(Box::leak(Box::new(glutin_window))); | ------------- move occurs because `glutin_window` has type `RefCell<&mut ContextWrapper<PossiblyCurrent, winit::window::Window>>`, which does not implement the `Copy` trait 331 | #[cfg(not(target_arch = "wasm32"))] 332 | let winit_window = Box::leak(Box::new(glutin_window)).borrow().window(); | ------------- value moved here ... 437 | events_loop.run(move |event, _event_loop, control_flow| { | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ value used here after move ... 458 | glutin_window.borrow().resize(physical_size); | ------------- use occurs due to use in closure error: aborting due to 2 previous errors

This reverts commit 8f78ec4.

iceiix · 2021-01-03T04:25:16Z

This works on wasm but breaks native, because of borrowing glutin_window:

error[E0505]: cannot move out of `glutin_window` because it is borrowed
   --> src/main.rs:435:21
    |
330 |     let winit_window = glutin_window.window();
    |                        ----------------------
    |                        |
    |                        borrow of `*glutin_window` occurs here
    |                        argument requires that `*glutin_window` is borrowed for `'static`
...
435 |     events_loop.run(move |event, _event_loop, control_flow| {
    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ move out of `glutin_window` occurs here
...
456 |             glutin_window.resize(physical_size);
    |             ------------- move occurs due to use in closure

wasm: enable events loop

4d459ca

iceiix mentioned this pull request Jan 1, 2021

🕸️ Web support #446

Open

29 tasks

iceiix added 6 commits January 1, 2021 13:41

Use Rc<RefCell>'s for winit_window

26586f8

Rc<RefCell> for game and ui_container

d0e7eda

Use less noisy variable names, due to shadowing

d71e32a

Use winit_window from glutin_window earlier not in events_loop

c6f18e6

Remove unnecessary mutable on ui_container

66c47c8

Log when entering/exiting render/events loops

542fa1b

iceiix added 5 commits January 2, 2021 10:35

main: disable set_cursor_grab() call on wasm to get further until Poi…

f118953

…nter Lock is available

Revert "Log when entering/exiting render/events loops"

1dca9fd

This reverts commit 542fa1b.

Leak the glutin_window, fixes E0597 glutin_window does not live long …

991b5f1

…enough

Revert "Failed attempt at fixing use of moved value"

3e672ad

This reverts commit 8f78ec4.

iceiix added 2 commits January 3, 2021 16:41

Fix borrowing winit_window with native

4350a01

Remove unnecessary Box leak

8e57cca

iceiix merged commit 8208e3b into master Jan 4, 2021

iceiix deleted the events_loop branch January 4, 2021 18:14

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wasm: enable events loop #459

wasm: enable events loop #459

iceiix commented Jan 1, 2021

iceiix commented Jan 1, 2021 •

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iceiix commented Jan 2, 2021

iceiix commented Jan 2, 2021

iceiix commented Jan 3, 2021

wasm: enable events loop #459

wasm: enable events loop #459

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iceiix commented Jan 1, 2021 •

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