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<()>) {
35        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
61        let window_builder = WindowBuilder::new()
62            .with_title(config.title)
63            .with_inner_size(PhysicalSize::new(config.width, config.height));
64
65        #[cfg(target_arch = "wasm32")]
66        let window = {
67            use wasm_bindgen::JsCast;
68            use winit::platform::web::WindowBuilderExtWebSys;
69
70            let web_window = web_sys::window().expect("no global `window` exists");
71            let document = web_window
72                .document()
73                .expect("should have a document on window");
74            let canvas = document
75                .get_element_by_id("canvas")
76                .expect("no element with id `canvas` found — add <canvas id=\"wgpu_canvas\"></canvas> to index.html")
77                .unchecked_into::<web_sys::HtmlCanvasElement>();
78
79            Arc::new(
80                window_builder
81                    .with_canvas(Some(canvas))
82                    .build(&event_loop)
83                    .unwrap(),
84            )
85        };
86
87        #[cfg(not(target_arch = "wasm32"))]
88        let window = Arc::new(window_builder.build(&event_loop).unwrap());
89
90        Self {
91            window,
92            event_loop,
93            input: Input::new(),
94        }
95    }
96
97    fn size(handle: &Self::Handle) -> (u32, u32) {
98        let s = handle.inner_size();
99        (s.width, s.height)
100    }
101
102    fn exposed(&self) -> Self::Exposed {
103        self.input.clone()
104    }
105
106    fn handle(&self) -> &Self::Handle {
107        &self.window
108    }
109}
110
111impl WindowRunner for WinitWindow {
112    fn run(self, mut on_frame: impl FnMut() + 'static) {
113        let Self {
114            window,
115            event_loop,
116            input,
117        } = self;
118
119        event_loop
120            .run(move |event, elwt| {
121                input.update(&event);
122
123                match &event {
124                    Event::WindowEvent {
125                        event: WindowEvent::CloseRequested,
126                        ..
127                    } => elwt.exit(),
128                    Event::WindowEvent {
129                        event: WindowEvent::RedrawRequested,
130                        ..
131                    } => on_frame(),
132                    Event::AboutToWait => window.request_redraw(),
133                    _ => {}
134                }
135            })
136            .unwrap();
137    }
138}
139
140impl PresentableWindow for WinitWindow {}
pebble/wgpu/window.rs

pebble/wgpu/
window.rs
