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 mut window_builder = WindowBuilder::new().with_title(config.title);
63
64        #[cfg(not(target_arch = "wasm32"))]
65        {
66            window_builder =
67                window_builder.with_inner_size(PhysicalSize::new(config.width, config.height));
68        }
69
70        #[cfg(target_arch = "wasm32")]
71        let window = {
72            use wasm_bindgen::JsCast;
73            use winit::platform::web::WindowBuilderExtWebSys;
74
75            let web_window = web_sys::window().expect("no global `window` exists");
76            let document = web_window
77                .document()
78                .expect("should have a document on window");
79            let canvas = document
80                .get_element_by_id("wgpu_canvas")
81                .expect("no element with id `canvas` found — add <canvas id=\"wgpu_canvas\"></canvas> to index.html")
82                .unchecked_into::<web_sys::HtmlCanvasElement>();
83
84            Arc::new(
85                window_builder
86                    .with_canvas(Some(canvas))
87                    .build(&event_loop)
88                    .unwrap(),
89            )
90        };
91
92        #[cfg(not(target_arch = "wasm32"))]
93        let window = Arc::new(window_builder.build(&event_loop).unwrap());
94
95        Self {
96            window,
97            event_loop,
98            input: Input::new(),
99        }
100    }
101
102    fn size(handle: &Self::Handle) -> (u32, u32) {
103        let s = handle.inner_size();
104        (s.width, s.height)
105    }
106
107    fn exposed(&self) -> Self::Exposed {
108        self.input.clone()
109    }
110
111    fn handle(&self) -> &Self::Handle {
112        &self.window
113    }
114}
115
116impl WindowRunner for WinitWindow {
117    fn run(self, mut on_frame: impl FnMut() + 'static) {
118        let Self {
119            window,
120            event_loop,
121            input,
122        } = self;
123
124        event_loop
125            .run(move |event, elwt| {
126                let stepped = input.update(&event);
127
128                match &event {
129                    Event::WindowEvent {
130                        event: WindowEvent::CloseRequested,
131                        ..
132                    } => elwt.exit(),
133                    _ => {}
134                }
135
136                if stepped {
137                    on_frame();
138                    window.request_redraw();
139                }
140            })
141            .unwrap();
142    }
143}
144
145impl PresentableWindow for WinitWindow {}
pebble/wgpu/window.rs

pebble/wgpu/
window.rs
