[rs] Update to latest winit (0.20.0-alpha6)

- `RedrawRequested` is now used for rendering
- `EventsCleared` replaced by `MainEventsCleared` which requests redraw
- Removed capture from hello-triangle to simplify it slightly

wgpu/Cargo.toml

@@ -48,7 +48,7 @@ env_logger = "0.7"
 glsl-to-spirv = "0.1"
 log = "0.4"
 png = "0.15"
-winit = "0.20.0-alpha4"
+winit = "0.20.0-alpha6"
 rand = "0.7.2"
 zerocopy = "0.2"
 futures = "0.3"

wgpu/examples/framework.rs

@@ -63,7 +63,7 @@ pub fn run<E: Example>(title: &str) {
     log::info!("Initializing the window...");
 
     #[cfg(not(feature = "gl"))]
-    let (_window, hidpi_factor, size, surface) = {
+    let (window, hidpi_factor, size, surface) = {
         let window = winit::window::Window::new(&event_loop).unwrap();
         window.set_title(title);
         let hidpi_factor = window.hidpi_factor();
@@ -73,7 +73,7 @@ pub fn run<E: Example>(title: &str) {
     };
 
     #[cfg(feature = "gl")]
-    let (_window, instance, hidpi_factor, size, surface) = {
+    let (window, instance, hidpi_factor, size, surface) = {
         let wb = winit::WindowBuilder::new();
         let cb = wgpu::glutin::ContextBuilder::new().with_vsync(true);
         let context = cb.build_windowed(wb, &event_loop).unwrap();
@@ -132,6 +132,7 @@ pub fn run<E: Example>(title: &str) {
             ControlFlow::Poll
         };
         match event {
+            event::Event::MainEventsCleared => window.request_redraw(),
             event::Event::WindowEvent {
                 event: WindowEvent::Resized(size),
                 ..
@@ -162,15 +163,15 @@ pub fn run<E: Example>(title: &str) {
                 _ => {
                     example.update(event);
                 }
-            },
-            event::Event::EventsCleared => {
+            }
+            event::Event::RedrawRequested(_) => {
                 let frame = swap_chain
                     .get_next_texture()
                     .expect("Timeout when acquiring next swap chain texture");
                 let command_buf = example.render(&frame, &device);
                 queue.submit(&[command_buf]);
             }
-            _ => (),
+            _ => {}
         }
     });
 }

wgpu/examples/hello-triangle/main.rs

@@ -8,7 +8,7 @@ fn main() {
     let event_loop = EventLoop::new();
 
     #[cfg(not(feature = "gl"))]
-    let (_window, size, surface) = {
+    let (window, size, surface) = {
         let window = winit::window::Window::new(&event_loop).unwrap();
         let size = window.inner_size().to_physical(window.hidpi_factor());
 
@@ -17,7 +17,7 @@ fn main() {
     };
 
     #[cfg(feature = "gl")]
-    let (_window, instance, size, surface) = {
+    let (window, instance, size, surface) = {
         let wb = winit::WindowBuilder::new();
         let cb = wgpu::glutin::ContextBuilder::new().with_vsync(true);
         let context = cb.build_windowed(wb, &event_loop).unwrap();
@@ -113,28 +113,10 @@ fn main() {
     );
 
     event_loop.run(move |event, _, control_flow| {
-        *control_flow = if cfg!(feature = "metal-auto-capture") {
-            ControlFlow::Exit
-        } else {
-            ControlFlow::Poll
-        };
+        *control_flow = ControlFlow::Poll;
         match event {
-            event::Event::WindowEvent { event, .. } => match event {
-                event::WindowEvent::KeyboardInput {
-                    input:
-                        event::KeyboardInput {
-                            virtual_keycode: Some(event::VirtualKeyCode::Escape),
-                            state: event::ElementState::Pressed,
-                            ..
-                        },
-                    ..
-                }
-                | event::WindowEvent::CloseRequested => {
-                    *control_flow = ControlFlow::Exit;
-                }
-                _ => {}
-            },
-            event::Event::EventsCleared => {
+            event::Event::MainEventsCleared => window.request_redraw(),
+            event::Event::RedrawRequested(_) => {
                 let frame = swap_chain
                     .get_next_texture()
                     .expect("Timeout when acquiring next swap chain texture");
@@ -158,7 +140,11 @@ fn main() {
 
                 queue.submit(&[encoder.finish()]);
             }
-            _ => (),
+            event::Event::WindowEvent {
+                event: event::WindowEvent::CloseRequested,
+                ..
+            } => *control_flow = ControlFlow::Exit,
+            _ => {}
         }
     });
 }