sugarloaf 0.0.16

Sugarloaf is Rio rendering engine, desgined to be multiplatform. It is based on WebGPU, Rust library for Desktops and WebAssembly for Web (JavaScript). This project is created and maintaned for Rio terminal purposes but feel free to use it.
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#[derive(Debug)]
pub struct Context {
    pub device: wgpu::Device,
    pub surface: wgpu::Surface,
    pub queue: wgpu::Queue,
    pub staging_belt: wgpu::util::StagingBelt,
    pub format: wgpu::TextureFormat,
    pub size: winit::dpi::PhysicalSize<u32>,
    pub scale: f32,
    pub adapter_info: wgpu::AdapterInfo,
}

impl Context {
    pub async fn new(
        winit_window: &winit::window::Window,
        power_preference: wgpu::PowerPreference,
    ) -> Context {
        #[cfg(target_arch = "wasm32")]
        let default_backend = wgpu::Backends::BROWSER_WEBGPU | wgpu::Backends::GL;
        #[cfg(not(target_arch = "wasm32"))]
        let default_backend = wgpu::Backends::all();

        // The backend can be configured using the `WGPU_BACKEND`
        // environment variable. If the variable is not set, the primary backend
        // will be used. The following values are allowed:
        // - `vulkan`
        // - `metal`
        // - `dx12`
        // - `dx11`
        // - `gl`
        // - `webgpu`
        // - `primary`
        let backend = wgpu::util::backend_bits_from_env().unwrap_or(default_backend);
        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
            backends: backend,
            ..Default::default()
        });

        log::info!("selected instance: {instance:?}");

        #[cfg(not(target_arch = "wasm32"))]
        {
            log::info!("Available adapters:");
            for a in instance.enumerate_adapters(wgpu::Backends::all()) {
                log::info!("    {:?}", a.get_info())
            }
        }

        log::info!("initializing the surface");

        let size = winit_window.inner_size();
        let scale = winit_window.scale_factor();

        let surface = unsafe { instance.create_surface(&winit_window).unwrap() };

        let adapter = instance
            .request_adapter(&wgpu::RequestAdapterOptions {
                power_preference,
                compatible_surface: Some(&surface),
                force_fallback_adapter: false,
            })
            .await
            .expect("Request adapter");

        log::info!("Selected adapter: {:?}", adapter.get_info());

        let caps = surface.get_capabilities(&adapter);

        // TODO: Fix formats with signs
        let unsupported_formats = wgpu::TextureFormat::Rgba8Snorm;
        let filtered_formats: Vec<wgpu::TextureFormat> = caps
            .formats
            .iter()
            .copied()
            .filter(|&x| {
                x != unsupported_formats && wgpu::TextureFormat::has_color_aspect(&x)
            })
            .collect();

        let mut format: wgpu::TextureFormat = caps.formats.first().unwrap().to_owned();
        if !filtered_formats.is_empty() {
            format = filtered_formats.last().unwrap().to_owned();
        }

        log::info!(
            "Sugarloaf selected format: {format:?} from {:?}",
            caps.formats
        );
        let (device, queue) = (async {
            {
                if let Ok(result) = adapter
                    .request_device(&wgpu::DeviceDescriptor::default(), None)
                    .await
                {
                    result
                } else {
                    // These downlevel limits will allow the code to run on all possible hardware
                    adapter
                        .request_device(
                            &wgpu::DeviceDescriptor {
                                label: None,
                                features: wgpu::Features::empty(),
                                limits: wgpu::Limits::downlevel_webgl2_defaults(),
                            },
                            None,
                        )
                        .await
                        .expect("Request device")
                }
            }
        })
        .await;

        let staging_belt = wgpu::util::StagingBelt::new(2 * 1024);

        surface.configure(
            &device,
            &wgpu::SurfaceConfiguration {
                usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
                format,
                width: size.width,
                height: size.height,
                view_formats: vec![],
                alpha_mode: wgpu::CompositeAlphaMode::Auto,
                present_mode: wgpu::PresentMode::AutoVsync,
            },
        );

        Context {
            device,
            queue,
            surface,
            staging_belt,
            format,
            size,
            scale: scale as f32,
            adapter_info: adapter.get_info(),
        }
    }

    pub fn resize(&mut self, width: u32, height: u32) {
        self.size.width = width;
        self.size.height = height;
        self.surface.configure(
            &self.device,
            &wgpu::SurfaceConfiguration {
                usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
                format: self.format,
                width,
                height,
                view_formats: vec![],
                alpha_mode: wgpu::CompositeAlphaMode::Auto,
                present_mode: wgpu::PresentMode::AutoVsync,
            },
        );
    }
}