pebble/wgpu/
window.rs

1use std::ops::Deref;
2use std::sync::{Arc, Mutex, MutexGuard};
3
4use winit::{
5    dpi::PhysicalSize,
6    event::{Event, WindowEvent},
7    event_loop::EventLoop,
8    window::{Window, WindowBuilder},
9};
10use winit_input_helper::WinitInputHelper;
11
12use crate::rendering::window::{PresentableWindow, WindowConfig, WindowProvider, WindowRunner};
13
14/// Shared handle to the frame's input state.
15///
16/// Cheap to clone (an `Arc` internally). Call [`Input::get`] to read it —
17/// the returned [`InputGuard`] derefs straight to [`WinitInputHelper`], so
18/// there's no `.lock().unwrap()` at every call site.
19#[derive(Clone)]
20pub struct Input(Arc<Mutex<WinitInputHelper>>);
21
22impl Input {
23    fn new() -> Self {
24        Self(Arc::new(Mutex::new(WinitInputHelper::new())))
25    }
26
27    /// Borrow the current input state. Panics if the lock is poisoned (a
28    /// prior holder panicked while holding it), matching how the rest of
29    /// this codebase treats poisoning as an unrecoverable bug.
30    pub fn get(&self) -> InputGuard<'_> {
31        InputGuard(self.0.lock().unwrap())
32    }
33
34    fn update(&self, event: &Event<()>) -> bool {
35        return self.0.lock().unwrap().update(event);
36    }
37}
38
39pub struct InputGuard<'a>(MutexGuard<'a, WinitInputHelper>);
40
41impl Deref for InputGuard<'_> {
42    type Target = WinitInputHelper;
43    fn deref(&self) -> &Self::Target {
44        &self.0
45    }
46}
47
48pub struct WinitWindow {
49    window: Arc<Window>,
50    event_loop: EventLoop<()>,
51    input: Input,
52}
53
54impl WindowProvider for WinitWindow {
55    type Handle = Arc<Window>;
56    type Exposed = Input;
57
58    fn create(config: &WindowConfig) -> Self {
59        let event_loop = EventLoop::new().unwrap();
60        event_loop.set_control_flow(winit::event_loop::ControlFlow::Poll);
61
62        let window_builder = WindowBuilder::new()
63            .with_title(config.title)
64            .with_inner_size(PhysicalSize::new(config.width, config.height));
65
66        #[cfg(target_arch = "wasm32")]
67        let window = {
68            use wasm_bindgen::JsCast;
69            use winit::platform::web::WindowBuilderExtWebSys;
70
71            let web_window = web_sys::window().expect("no global `window` exists");
72            let document = web_window
73                .document()
74                .expect("should have a document on window");
75            let canvas = document
76                .get_element_by_id("canvas")
77                .expect("no element with id `canvas` found — add <canvas id=\"wgpu_canvas\"></canvas> to index.html")
78                .unchecked_into::<web_sys::HtmlCanvasElement>();
79
80            Arc::new(
81                window_builder
82                    .with_canvas(Some(canvas))
83                    .build(&event_loop)
84                    .unwrap(),
85            )
86        };
87
88        #[cfg(not(target_arch = "wasm32"))]
89        let window = Arc::new(window_builder.build(&event_loop).unwrap());
90
91        Self {
92            window,
93            event_loop,
94            input: Input::new(),
95        }
96    }
97
98    fn size(handle: &Self::Handle) -> (u32, u32) {
99        let s = handle.inner_size();
100        (s.width, s.height)
101    }
102
103    fn exposed(&self) -> Self::Exposed {
104        self.input.clone()
105    }
106
107    fn handle(&self) -> &Self::Handle {
108        &self.window
109    }
110}
111
112impl WindowRunner for WinitWindow {
113    fn run(self, mut on_frame: impl FnMut() + 'static) {
114        let Self {
115            window,
116            event_loop,
117            input,
118        } = self;
119
120        event_loop
121            .run(move |event, elwt| {
122                let stepped = input.update(&event);
123
124                match &event {
125                    Event::WindowEvent {
126                        event: WindowEvent::CloseRequested,
127                        ..
128                    } => elwt.exit(),
129                    _ => {}
130                }
131
132                if stepped {
133                    on_frame();
134                    window.request_redraw();
135                }
136            })
137            .unwrap();
138    }
139}
140
141impl PresentableWindow for WinitWindow {}
pebble/wgpu/window.rs

pebble/wgpu/
window.rs
