separate render function

src/main.rs

@@ -37,6 +37,32 @@ impl MainWindow {
 		}
 	}
 
+	fn render(&self, output: &wgpu::Texture) {
+		let view = output.create_view(&wgpu::TextureViewDescriptor::default());
+		let mut encoder = self
+			.device
+			.create_command_encoder(&wgpu::CommandEncoderDescriptor::default());
+		encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+			color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+				view: &view,
+				depth_slice: None,
+				resolve_target: None,
+				ops: wgpu::Operations {
+					load: wgpu::LoadOp::Clear(wgpu::Color {
+						r: 0.1,
+						g: 0.2,
+						b: 0.8,
+						a: 1.0,
+					}),
+					store: wgpu::StoreOp::Store,
+				},
+			})],
+			depth_stencil_attachment: None,
+			..Default::default()
+		});
+		self.queue.submit(std::iter::once(encoder.finish()));
+	}
+
 	fn event(&mut self, event_loop: &ActiveEventLoop, event: WindowEvent) {
 		match event {
 			WindowEvent::CloseRequested => event_loop.exit(),
@@ -62,8 +88,8 @@ impl MainWindow {
 				if !self.surface_configured {
 					return;
 				}
-
 				let output = self.surface.get_current_texture().unwrap();
+				self.render(&output.texture);
 				output.present();
 			}
 			_ => {}