zenthra-render 0.2.2

Wgpu-based GPU renderer for the Zenthra UI framework
Documentation 
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use std::sync::Arc;
use winit::window::Window;

pub struct GpuContext {
    pub device: Arc<wgpu::Device>,
    pub queue: Arc<wgpu::Queue>,
    pub surface: wgpu::Surface<'static>,
    pub config: wgpu::SurfaceConfiguration,
    pub size: winit::dpi::PhysicalSize<u32>,
    pub scale_factor: f64,
}

impl GpuContext {
    pub async fn new(window: Arc<Window>) -> Self {
        let size = window.inner_size();

        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
            backends: wgpu::Backends::all(),
            flags: wgpu::InstanceFlags::default(),
            memory_budget_thresholds: Default::default(),
            backend_options: Default::default(),
            display: Default::default(),
        });
        let surface = instance.create_surface(window.clone()).unwrap();

        let adapter = instance
            .request_adapter(&wgpu::RequestAdapterOptions {
                power_preference: wgpu::PowerPreference::HighPerformance,
                compatible_surface: Some(&surface),
                force_fallback_adapter: false,
            })
            .await
            .unwrap();

        let (device, queue) = adapter
            .request_device(&wgpu::DeviceDescriptor {
                label: Some("Zenthra Device"),
                required_features: wgpu::Features::empty(),
                required_limits: wgpu::Limits::default(),
                memory_hints: Default::default(),
                trace: wgpu::Trace::Off,
                experimental_features: wgpu::ExperimentalFeatures::disabled(),
            })
            .await
            .unwrap();

        let surface_caps = surface.get_capabilities(&adapter);
        let surface_format = surface_caps
            .formats
            .iter()
            .find(|f| f.is_srgb())
            .copied()
            .unwrap_or(surface_caps.formats[0]);

        let alpha_mode = if surface_caps.alpha_modes.contains(&wgpu::CompositeAlphaMode::PostMultiplied) {
            wgpu::CompositeAlphaMode::PostMultiplied
        } else if surface_caps.alpha_modes.contains(&wgpu::CompositeAlphaMode::PreMultiplied) {
            wgpu::CompositeAlphaMode::PreMultiplied
        } else {
            surface_caps.alpha_modes[0]
        };

        let config = wgpu::SurfaceConfiguration {
            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
            format: surface_format,
            width: size.width,
            height: size.height,
            present_mode: wgpu::PresentMode::AutoVsync,
            alpha_mode,
            view_formats: vec![],
            desired_maximum_frame_latency: 2,
        };
        surface.configure(&device, &config);

        let scale_factor = window.scale_factor();

        Self {
            device: Arc::new(device),
            queue: Arc::new(queue),
            surface,
            config,
            size,
            scale_factor,
        }
    }

    pub fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>, scale_factor: f64) {
        if new_size.width > 0 && new_size.height > 0 {
            self.size = new_size;
            self.scale_factor = scale_factor;
            self.config.width = new_size.width;
            self.config.height = new_size.height;
            self.surface.configure(&self.device, &self.config);
        }
    }
}