resonance 0.1.0

A modular game engine. Heavy work in progress.
Documentation 
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use std::sync::Arc;
use anyhow::Result;
use bevy_ecs::prelude::Resource;
use wgpu::{Device, Queue, Surface, SurfaceConfiguration};
use winit::window::Window;

#[derive(Resource)]
pub struct Renderer {
    surface: Surface<'static>,
    device: Device,
    queue: Queue,
    config: SurfaceConfiguration,
    size: (u32, u32),
}

impl Renderer {
    fn new(window: Arc<Window>) -> Result<Self> {
        let size = window.inner_size();
        let width = size.width.max(1);
        let height = size.height.max(1);

        let instance = wgpu::Instance::new(&wgpu::InstanceDescriptor {
            backends: wgpu::Backends::all(),
            flags: wgpu::InstanceFlags::empty(),
            ..Default::default()
        });

        let surface = instance.create_surface(window)?;

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

        let (device, queue) = pollster::block_on(adapter.request_device(
            &wgpu::DeviceDescriptor {
                label: Some("Resonance Device"),
                required_features: wgpu::Features::empty(),
                required_limits: wgpu::Limits::default(),
                memory_hints: Default::default(),
                experimental_features: Default::default(),
                trace: wgpu::Trace::Off,
            },
        ))?;

        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 config = SurfaceConfiguration {
            usage: wgpu::TextureUsages::RENDER_ATTACHMENT,
            format: surface_format,
            width,
            height,
            present_mode: wgpu::PresentMode::Fifo,
            alpha_mode: surface_caps.alpha_modes[0],
            view_formats: vec![],
            desired_maximum_frame_latency: 2,
        };
        surface.configure(&device, &config);

        log::info!(
            "Renderer initialized: {}x{}, format: {:?}",
            width,
            height,
            surface_format
        );

        Ok(Self {
            surface,
            device,
            queue,
            config,
            size: (width, height),
        })
    }

    pub fn resize(&mut self, width: u32, height: u32) {
        let width = width.max(1);
        let height = height.max(1);

        if self.size != (width, height) {
            self.size = (width, height);
            self.config.width = width;
            self.config.height = height;
            self.surface.configure(&self.device, &self.config);
            log::debug!("Renderer resized to {}x{}", width, height);
        }
    }

    pub fn size(&self) -> (u32, u32) {
        self.size
    }

    pub fn device(&self) -> &Device {
        &self.device
    }

    pub fn queue(&self) -> &Queue {
        &self.queue
    }

    pub fn surface(&self) -> &Surface<'_> {
        &self.surface
    }

    pub fn config(&self) -> &SurfaceConfiguration {
        &self.config
    }

    pub fn render(&mut self) -> Result<()> {
        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: wgpu::StoreOp::Store,
                    },
                    depth_slice: None,
                })],
                depth_stencil_attachment: None,
                occlusion_query_set: None,
                timestamp_writes: None,
            });
        }

        self.queue.submit(std::iter::once(encoder.finish()));
        output.present();

        Ok(())
    }
}

pub fn create_renderer_sync(window: Arc<Window>) -> Result<Renderer> {
    Renderer::new(window)
}