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panic when running example multiple_windows #1069
Description
Bevy version
Operating system & version
macOS 10.15.7
What you did
run example multiple_windows
cargo run --example multiple_windows
Finished dev [unoptimized + debuginfo] target(s) in 0.61s
Running `target/debug/examples/multiple_windows`
thread 'main' panicked at 'Received window resized event for non-existent window.', crates/bevy_render/src/render_graph/nodes/window_swapchain_node.rs:52:14
stack backtrace:
0: rust_begin_unwind
at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4/library/std/src/panicking.rs:483
1: core::panicking::panic_fmt
at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4/library/core/src/panicking.rs:85
2: core::option::expect_failed
at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4/library/core/src/option.rs:1226
3: core::option::Option<T>::expect
at /Users/francois/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/option.rs:346
4: <bevy_render::render_graph::nodes::window_swapchain_node::WindowSwapChainNode as bevy_render::render_graph::node::Node>::update
at ./crates/bevy_render/src/render_graph/nodes/window_swapchain_node.rs:50
5: bevy_wgpu::renderer::wgpu_render_graph_executor::WgpuRenderGraphExecutor::execute
at ./crates/bevy_wgpu/src/renderer/wgpu_render_graph_executor.rs:73
6: bevy_wgpu::wgpu_renderer::WgpuRenderer::run_graph
at ./crates/bevy_wgpu/src/wgpu_renderer.rs:103
7: bevy_wgpu::wgpu_renderer::WgpuRenderer::update
at ./crates/bevy_wgpu/src/wgpu_renderer.rs:114
8: bevy_wgpu::get_wgpu_render_system::{{closure}}
at ./crates/bevy_wgpu/src/lib.rs:41
9: bevy_ecs::system::into_thread_local::<impl bevy_ecs::system::into_system::IntoSystem<(&mut bevy_ecs::core::world::World,&mut bevy_ecs::resource::resources::Resources),bevy_ecs::system::into_thread_local::ThreadLocalSystemFn> for F>::system::{{closure}}
at ./crates/bevy_ecs/src/system/into_thread_local.rs:65
10: <alloc::boxed::Box<F> as core::ops::function::FnMut<A>>::call_mut
at /Users/francois/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1049
11: <bevy_ecs::system::into_thread_local::ThreadLocalSystemFn as bevy_ecs::system::system::System>::run_thread_local
at ./crates/bevy_ecs/src/system/into_thread_local.rs:49
12: <bevy_ecs::schedule::stage_executor::ParallelSystemStageExecutor as bevy_ecs::schedule::stage_executor::SystemStageExecutor>::execute_stage
at ./crates/bevy_ecs/src/schedule/stage_executor.rs:481
13: bevy_ecs::schedule::stage::SystemStage::run_once
at ./crates/bevy_ecs/src/schedule/stage.rs:117
14: <bevy_ecs::schedule::stage::SystemStage as bevy_ecs::schedule::stage::Stage>::run
at ./crates/bevy_ecs/src/schedule/stage.rs:151
15: bevy_ecs::schedule::Schedule::run_once
at ./crates/bevy_ecs/src/schedule/mod.rs:162
16: <bevy_ecs::schedule::Schedule as bevy_ecs::schedule::stage::Stage>::run
at ./crates/bevy_ecs/src/schedule/mod.rs:202
17: bevy_ecs::schedule::Schedule::initialize_and_run
at ./crates/bevy_ecs/src/schedule/mod.rs:169
18: bevy_app::app::App::update
at ./crates/bevy_app/src/app.rs:56
19: bevy_winit::winit_runner::{{closure}}
at ./crates/bevy_winit/src/lib.rs:363
20: <alloc::boxed::Box<F> as core::ops::function::FnMut<A>>::call_mut
at /Users/francois/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1049
21: <winit::platform_impl::platform::app_state::EventLoopHandler<T> as winit::platform_impl::platform::app_state::EventHandler>::handle_nonuser_event
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/macos/app_state.rs:71
22: winit::platform_impl::platform::app_state::Handler::handle_nonuser_event
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/macos/app_state.rs:173
23: winit::platform_impl::platform::app_state::AppState::cleared
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/macos/app_state.rs:331
24: winit::platform_impl::platform::observer::control_flow_end_handler
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/macos/observer.rs:135
25: ___CFRunLoopRun
26: ___CFRunLoopRun
27: _CFRunLoopRunSpecific
28: _____kCFPasteboardFilenamesFlavor_block_invoke
29: _RunCurrentEventLoopInMode
30: _ReceiveNextEventCommon
31: __BlockUntilNextEventMatchingListInModeWithFilter
32: __DPSNextEvent
33: -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]
34: -[NSApplication run]
35: <() as objc::message::MessageArguments>::invoke
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/objc-0.2.7/src/message/mod.rs:128
36: objc::message::platform::send_unverified
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/objc-0.2.7/src/message/apple/mod.rs:27
37: objc::message::send_message
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/objc-0.2.7/src/message/mod.rs:178
38: winit::platform_impl::platform::event_loop::EventLoop<T>::run_return
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/macos/event_loop.rs:106
39: winit::platform_impl::platform::event_loop::EventLoop<T>::run
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/platform_impl/macos/event_loop.rs:93
40: winit::event_loop::EventLoop<T>::run
at /Users/francois/.cargo/registry/src/github.com-1ecc6299db9ec823/winit-0.24.0/src/event_loop.rs:154
41: bevy_winit::run
at ./crates/bevy_winit/src/lib.rs:121
42: bevy_winit::winit_runner
at ./crates/bevy_winit/src/lib.rs:371
43: core::ops::function::Fn::call
at /Users/francois/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:70
44: <alloc::boxed::Box<F> as core::ops::function::Fn<A>>::call
at /Users/francois/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1056
45: bevy_app::app::App::run
at ./crates/bevy_app/src/app.rs:67
46: bevy_app::app_builder::AppBuilder::run
at ./crates/bevy_app/src/app_builder.rs:49
47: multiple_windows::main
at ./examples/window/multiple_windows.rs:17
48: core::ops::function::FnOnce::call_once
at /Users/francois/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:227
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
What you expected to happen
the example shouldn't panic
What actually happened
it panicked
Additional information
commit 509b138 broke this example
Activity
mockersf commentedon Dec 15, 2020
adding a few logs when calling
handle_create_window_events, received winit events, creating the second window andcalling WindowSwapChainNode.updatewe can see that event
MainEventsClearedis received, thenhandle_create_window_eventsis called, before the startup system runs and create the second windowmaybe look around #1021 (comment)
IngmarBitter commentedon Dec 15, 2020
bevy version 0.3.0, commit sha 51650f1 running on Windows 10 with NVida GTX 3090 I get the same:
thread 'main' panicked at 'Received window resized event for non-existent window.', crates\bevy_render\src\render_graph\nodes\window_swapchain_node.rs:52:14blunted2night commentedon Dec 16, 2020
I think this is due to PR #1033 that changes how window creation is done. Now the bevy window is not added until after the underlying OS window is created. I know in MS Windows that a number of messages are dispatched during window creation, including a WM_SIZE, which if allowed to make it all the way would produce this behavior.
blunted2night commentedon Dec 16, 2020
Never-mind, it was introduced in #1021 (509b138)