iced/wgpu/src/lib.rs

use iced_native::{
    button, checkbox, image, radio, renderer::Debugger, slider, text, Button,
    Checkbox, Color, Image, Layout, MouseCursor, Node, Point, Radio, Slider,
    Style, Text,
};

use raw_window_handle::HasRawWindowHandle;
use wgpu::{
    Adapter, CommandEncoderDescriptor, Device, DeviceDescriptor, Extensions,
    Instance, Limits, PowerPreference, RequestAdapterOptions, Surface,
    SwapChain, SwapChainDescriptor, TextureFormat, TextureUsage,
};

pub struct Renderer {
    instance: Instance,
    surface: Surface,
    adapter: Adapter,
    device: Device,
    swap_chain: SwapChain,
}

impl Renderer {
    pub fn new<W: HasRawWindowHandle>(
        window: &W,
        width: u32,
        height: u32,
    ) -> Self {
        let instance = Instance::new();

        let adapter = instance.request_adapter(&RequestAdapterOptions {
            power_preference: PowerPreference::LowPower,
        });

        let device = adapter.request_device(&DeviceDescriptor {
            extensions: Extensions {
                anisotropic_filtering: false,
            },
            limits: Limits { max_bind_groups: 1 },
        });

        let surface = instance.create_surface(window.raw_window_handle());

        let swap_chain = device.create_swap_chain(
            &surface,
            &SwapChainDescriptor {
                usage: TextureUsage::OUTPUT_ATTACHMENT,
                format: TextureFormat::Bgra8UnormSrgb,
                width,
                height,
                present_mode: wgpu::PresentMode::Vsync,
            },
        );

        Self {
            instance,
            surface,
            adapter,
            device,
            swap_chain,
        }
    }

    pub fn draw(&mut self) {
        let frame = self.swap_chain.get_next_texture();

        let mut encoder = self
            .device
            .create_command_encoder(&CommandEncoderDescriptor { todo: 0 });

        let _ = encoder.begin_render_pass(&wgpu::RenderPassDescriptor {
            color_attachments: &[wgpu::RenderPassColorAttachmentDescriptor {
                attachment: &frame.view,
                resolve_target: None,
                load_op: wgpu::LoadOp::Clear,
                store_op: wgpu::StoreOp::Store,
                clear_color: wgpu::Color {
                    r: 1.0,
                    g: 1.0,
                    b: 1.0,
                    a: 1.0,
                },
            }],
            depth_stencil_attachment: None,
        });

        self.device.get_queue().submit(&[encoder.finish()]);
    }
}

impl text::Renderer for Renderer {
    fn node(&self, _text: &Text) -> Node {
        Node::new(Style::default())
    }

    fn draw(&mut self, _text: &Text, _layout: Layout<'_>) {}
}

impl checkbox::Renderer for Renderer {
    fn node<Message>(&mut self, _checkbox: &Checkbox<Message>) -> Node {
        Node::new(Style::default())
    }

    fn draw<Message>(
        &mut self,
        _checkbox: &Checkbox<Message>,
        _layout: Layout<'_>,
        _cursor_position: Point,
    ) -> MouseCursor {
        MouseCursor::OutOfBounds
    }
}

impl radio::Renderer for Renderer {
    fn node<Message>(&mut self, _checkbox: &Radio<Message>) -> Node {
        Node::new(Style::default())
    }

    fn draw<Message>(
        &mut self,
        _radio: &Radio<Message>,
        _layout: Layout<'_>,
        _cursor_position: Point,
    ) -> MouseCursor {
        MouseCursor::OutOfBounds
    }
}

impl slider::Renderer for Renderer {
    fn node<Message>(&self, _slider: &Slider<Message>) -> Node {
        Node::new(Style::default())
    }

    fn draw<Message>(
        &mut self,
        _slider: &Slider<Message>,
        _layout: Layout<'_>,
        _cursor_position: Point,
    ) -> MouseCursor {
        MouseCursor::OutOfBounds
    }
}

impl image::Renderer<&str> for Renderer {
    fn node(&mut self, _image: &Image<&str>) -> Node {
        Node::new(Style::default())
    }

    fn draw(&mut self, _checkbox: &Image<&str>, _layout: Layout<'_>) {}
}

impl button::Renderer for Renderer {
    fn node<Message>(&self, _button: &Button<Message>) -> Node {
        Node::new(Style::default())
    }

    fn draw<Message>(
        &mut self,
        _button: &Button<Message>,
        _layout: Layout<'_>,
        _cursor_position: Point,
    ) -> MouseCursor {
        MouseCursor::OutOfBounds
    }
}

impl Debugger for Renderer {
    fn explain(&mut self, _layout: &Layout<'_>, _color: Color) {}
}