[oden] Following the wgpu tutorial

https://sotrh.github.io/learn-wgpu/beginner/tutorial2-surface/#render

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "oden"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+env_logger = "0.10"
+log = "0.4"
+wgpu = "0.16"
+winit = "0.28"
+pollster = "0.3"

src/lib.rs

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+use winit::{
+    event::*,
+    event_loop::{ControlFlow, EventLoop},
+    window::Window,
+    window::WindowBuilder,
+};
+
+struct State {
+    surface: wgpu::Surface,
+    device: wgpu::Device,
+    queue: wgpu::Queue,
+    config: wgpu::SurfaceConfiguration,
+    size: winit::dpi::PhysicalSize<u32>,
+    window: Window,
+}
+
+impl State {
+    // Creating some of the wgpu types requires async code
+    async fn new(window: Window) -> Self {
+        let size = window.inner_size();
+
+        // The instance is a handle to our GPU
+        // Backends::all => Vulkan + Metal + DX12 + Browser WebGPU
+        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
+            backends: wgpu::Backends::all(),
+            dx12_shader_compiler: Default::default(),
+        });
+
+        // # Safety
+        //
+        // The surface needs to live as long as the window that created it.
+        // State owns the window so this should be safe.
+        let surface = unsafe { instance.create_surface(&window) }.unwrap();
+
+        let adapter = instance
+            .request_adapter(&wgpu::RequestAdapterOptions {
+                power_preference: wgpu::PowerPreference::default(),
+                compatible_surface: Some(&surface),
+                force_fallback_adapter: false,
+            })
+            .await
+            .unwrap();
+
+        let (device, queue) = adapter
+            .request_device(
+                &wgpu::DeviceDescriptor {
+                    features: wgpu::Features::empty(),
+                    // WebGL doesn't support all of wgpu's features, so if
+                    // we're building for the web we'll have to disable some.
+                    limits: if cfg!(target_arch = "wasm32") {
+                        wgpu::Limits::downlevel_webgl2_defaults()
+                    } else {
+                        wgpu::Limits::default()
+                    },
+                    label: None,
+                },
+                None, // Trace path
+            )
+            .await
+            .unwrap();
+
+        let surface_caps = surface.get_capabilities(&adapter);
+
+        // Shader code in this tutorial assumes an sRGB surface
+        // texture. Using a different one will result all the colors coming
+        // out darker. If you want to support non sRGB surfaces, you'll need
+        // to account for that when drawing to the frame.
+        let surface_format = surface_caps
+            .formats
+            .iter()
+            .copied()
+            .find(|f| f.is_srgb())
+            .unwrap_or(surface_caps.formats[0]);
+        let config = wgpu::SurfaceConfiguration {
+            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
+            format: surface_format,
+            width: size.width,
+            height: size.height,
+            present_mode: surface_caps.present_modes[0],
+            alpha_mode: surface_caps.alpha_modes[0],
+            view_formats: vec![],
+        };
+        surface.configure(&device, &config);
+
+        Self {
+            window,
+            surface,
+            device,
+            queue,
+            config,
+            size,
+        }
+    }
+
+    pub fn window(&self) -> &Window {
+        &self.window
+    }
+
+    fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
+        if new_size.width > 0 && new_size.height > 0 {
+            self.size = new_size;
+            self.config.width = new_size.width;
+            self.config.height = new_size.height;
+            self.surface.configure(&self.device, &self.config);
+        }
+    }
+
+    fn input(&mut self, _event: &WindowEvent) -> bool {
+        false
+    }
+
+    fn update(&mut self) {}
+
+    fn render(&mut self) -> Result<(), wgpu::SurfaceError> {
+        let output = self.surface.get_current_texture()?;
+        let view = output
+            .texture
+            .create_view(&wgpu::TextureViewDescriptor::default());
+        let mut encoder = self
+            .device
+            .create_command_encoder(&wgpu::CommandEncoderDescriptor {
+                label: Some("Render Encoder"),
+            });
+
+        {
+            let _render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
+                label: Some("Render Pass"),
+                color_attachments: &[Some(wgpu::RenderPassColorAttachment {
+                    view: &view,
+                    resolve_target: None,
+                    ops: wgpu::Operations {
+                        load: wgpu::LoadOp::Clear(wgpu::Color {
+                            r: 0.1,
+                            g: 0.2,
+                            b: 0.3,
+                            a: 1.0,
+                        }),
+                        store: true,
+                    },
+                })],
+                depth_stencil_attachment: None,
+            });
+        }
+
+        // submit will accept anything that implements IntoIter
+        self.queue.submit(std::iter::once(encoder.finish()));
+        output.present();
+
+        Ok(())
+    }
+}
+
+pub async fn run() {
+    env_logger::init();
+    let event_loop = EventLoop::new();
+    let window = WindowBuilder::new().build(&event_loop).unwrap();
+
+    let mut state = State::new(window).await;
+
+    event_loop.run(move |event, _, control_flow| match event {
+        Event::WindowEvent {
+            ref event,
+            window_id,
+        } if window_id == state.window().id() => {
+            if !state.input(event) {
+                match event {
+                    WindowEvent::CloseRequested
+                    | WindowEvent::KeyboardInput {
+                        input:
+                            KeyboardInput {
+                                state: ElementState::Pressed,
+                                virtual_keycode: Some(VirtualKeyCode::Escape),
+                                ..
+                            },
+                        ..
+                    } => *control_flow = ControlFlow::Exit,
+
+                    WindowEvent::Resized(physical_size) => {
+                        state.resize(*physical_size);
+                    }
+
+                    WindowEvent::ScaleFactorChanged { new_inner_size, .. } => {
+                        // new_inner_size is &&mut so we have to dereference it twice
+                        state.resize(**new_inner_size);
+                    }
+
+                    _ => {}
+                }
+            }
+        }
+
+        Event::RedrawRequested(window_id) if window_id == state.window().id() => {
+            state.update();
+            match state.render() {
+                Ok(_) => {}
+                // Reconfigure the surface if lost
+                Err(wgpu::SurfaceError::Lost) => state.resize(state.size),
+                // The system is out of memory, we should probably quit
+                Err(wgpu::SurfaceError::OutOfMemory) => *control_flow = ControlFlow::Exit,
+                // All other errors (Outdated, Timeout) should be resolved by the next frame
+                Err(e) => eprintln!("{:?}", e),
+            }
+        }
+
+        Event::MainEventsCleared => {
+            // RedrawRequested will only trigger once, unless we manually
+            // request it.
+            state.window().request_redraw();
+        }
+
+        _ => {}
+    });
+}

src/main.rs

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+fn main() {
+    pollster::block_on(oden::run())
+}