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use std::iter;
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use winit::{
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event::*,
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event_loop::{ControlFlow, EventLoop},
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window::{Window, WindowBuilder},
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};
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struct State {
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#[allow(dead_code)]
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instance: wgpu::Instance,
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#[allow(dead_code)]
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adapter: wgpu::Adapter,
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surface: wgpu::Surface,
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device: wgpu::Device,
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queue: wgpu::Queue,
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config: wgpu::SurfaceConfiguration,
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size: winit::dpi::PhysicalSize<u32>,
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clear_color: wgpu::Color,
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}
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impl State {
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async fn new(window: &Window) -> Self {
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let size = window.inner_size();
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// The instance is a handle to our GPU
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// BackendBit::PRIMARY => Vulkan + Metal + DX12 + Browser WebGPU
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let instance = wgpu::Instance::new(wgpu::Backends::all());
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let surface = unsafe { instance.create_surface(window) };
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let adapter = instance
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.request_adapter(&wgpu::RequestAdapterOptions {
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power_preference: wgpu::PowerPreference::default(),
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compatible_surface: Some(&surface),
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force_fallback_adapter: false,
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})
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.await
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.unwrap();
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let (device, queue) = adapter
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.request_device(
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&wgpu::DeviceDescriptor {
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label: None,
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features: wgpu::Features::empty(),
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// WebGL doesn't support all of wgpu's features, so if
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// we're building for the web we'll have to disable some.
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limits: if cfg!(target_arch = "wasm32") {
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wgpu::Limits::downlevel_webgl2_defaults()
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} else {
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wgpu::Limits::default()
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},
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},
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None, // Trace path
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)
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.await
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.unwrap();
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let config = wgpu::SurfaceConfiguration {
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usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
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format: surface.get_preferred_format(&adapter).unwrap(),
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width: size.width,
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height: size.height,
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present_mode: wgpu::PresentMode::Fifo,
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};
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surface.configure(&device, &config);
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let clear_color = wgpu::Color::BLACK;
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Self {
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instance,
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adapter,
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surface,
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device,
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queue,
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config,
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clear_color,
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size,
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}
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}
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pub fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
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if new_size.width > 0 && new_size.height > 0 {
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self.size = new_size;
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self.config.width = new_size.width;
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self.config.height = new_size.height;
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self.surface.configure(&self.device, &self.config);
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}
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}
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fn input(&mut self, event: &WindowEvent) -> bool {
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match event {
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WindowEvent::CursorMoved { position, .. } => {
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self.clear_color = wgpu::Color {
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r: position.x as f64 / self.size.width as f64,
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g: position.y as f64 / self.size.height as f64,
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b: 1.0,
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a: 1.0,
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};
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true
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}
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_ => false,
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}
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}
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fn update(&mut self) {}
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fn render(&mut self) -> Result<(), wgpu::SurfaceError> {
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let output = self.surface.get_current_texture()?;
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let view = output
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.texture
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.create_view(&wgpu::TextureViewDescriptor::default());
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let mut encoder = self
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.device
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.create_command_encoder(&wgpu::CommandEncoderDescriptor {
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label: Some("Render Encoder"),
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});
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{
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let _render_pass = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
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label: Some("Render Pass"),
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color_attachments: &[wgpu::RenderPassColorAttachment {
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view: &view,
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resolve_target: None,
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ops: wgpu::Operations {
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load: wgpu::LoadOp::Clear(self.clear_color),
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store: true,
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},
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}],
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depth_stencil_attachment: None,
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});
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}
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self.queue.submit(iter::once(encoder.finish()));
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output.present();
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Ok(())
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}
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}
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fn main() {
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pollster::block_on(run());
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}
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async fn run() {
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env_logger::init();
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let event_loop = EventLoop::new();
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let window = WindowBuilder::new().build(&event_loop).unwrap();
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// State::new uses async code, so we're going to wait for it to finish
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let mut state = State::new(&window).await;
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event_loop.run(move |event, _, control_flow| {
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match event {
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Event::WindowEvent {
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ref event,
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window_id,
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} if window_id == window.id() => {
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if !state.input(event) {
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match event {
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WindowEvent::CloseRequested
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| WindowEvent::KeyboardInput {
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input:
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KeyboardInput {
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state: ElementState::Pressed,
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virtual_keycode: Some(VirtualKeyCode::Escape),
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..
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},
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..
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} => *control_flow = ControlFlow::Exit,
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WindowEvent::Resized(physical_size) => {
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state.resize(*physical_size);
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}
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WindowEvent::ScaleFactorChanged { new_inner_size, .. } => {
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// new_inner_size is &mut so w have to dereference it twice
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state.resize(**new_inner_size);
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}
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_ => {}
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}
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}
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}
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Event::RedrawRequested(window_id) if window_id == window.id() => {
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state.update();
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match state.render() {
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Ok(_) => {}
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// Reconfigure the surface if it's lost or outdated
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Err(wgpu::SurfaceError::Lost | wgpu::SurfaceError::Outdated) => state.resize(state.size),
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// The system is out of memory, we should probably quit
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Err(wgpu::SurfaceError::OutOfMemory) => *control_flow = ControlFlow::Exit,
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// We're ignoring timeouts
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Err(wgpu::SurfaceError::Timeout) => log::warn!("Surface timeout"),
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}
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}
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Event::MainEventsCleared => {
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window.request_redraw();
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}
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_ => {}
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}
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});
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}
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