scion 0.6.0

Game making library on top of wgpu, winit, legion
Documentation 
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use std::ops::Range;

use wgpu::{util::BufferInitDescriptor, PrimitiveTopology};

use crate::{
    core::components::{material::Material, maths::coordinates::Coordinates},
    rendering::{gl_representations::TexturedGlVertex, Renderable2D, RenderableUi},
};

/// Renderable 2D UIImage
#[derive(Debug)]
pub struct UiImage {
    image_path: String,
    contents: [TexturedGlVertex; 4],
}

const INDICES: &[u16] = &[0, 1, 3, 3, 1, 2];

impl UiImage {
    /// Creates a ui_image with `width` and `height` using image at `image_path`
    pub fn new(width: f32, height: f32, image_path: String) -> Self {
        let uvs = [
            Coordinates::new(0., 0.),
            Coordinates::new(0., 1.),
            Coordinates::new(1., 1.),
            Coordinates::new(1., 0.),
        ];
        UiImage::new_with_uv_map(width, height, image_path, uvs)
    }

    /// Creates a ui_image with `width` and `height` using image at `image_path`
    /// and customising uv_map
    pub fn new_with_uv_map(
        width: f32,
        height: f32,
        image_path: String,
        uvs: [Coordinates; 4],
    ) -> Self {
        let a = Coordinates::new(0., 0.);
        let b = Coordinates::new(a.x(), a.y() + height);
        let c = Coordinates::new(a.x() + width, a.y() + height);
        let d = Coordinates::new(a.x() + width, a.y());

        let contents = [
            TexturedGlVertex::from((&a, &uvs[0])),
            TexturedGlVertex::from((&b, &uvs[1])),
            TexturedGlVertex::from((&c, &uvs[2])),
            TexturedGlVertex::from((&d, &uvs[3])),
        ];
        Self { image_path, contents }
    }
}

impl Renderable2D for UiImage {
    fn vertex_buffer_descriptor(&mut self, _material: Option<&Material>) -> BufferInitDescriptor {
        wgpu::util::BufferInitDescriptor {
            label: Some("UI Image vertex buffer"),
            contents: bytemuck::cast_slice(&self.contents),
            usage: wgpu::BufferUsages::VERTEX,
        }
    }

    fn indexes_buffer_descriptor(&self) -> BufferInitDescriptor {
        wgpu::util::BufferInitDescriptor {
            label: Some("UI Image index buffer"),
            contents: bytemuck::cast_slice(&INDICES),
            usage: wgpu::BufferUsages::INDEX,
        }
    }

    fn range(&self) -> Range<u32> {
        0..INDICES.len() as u32
    }

    fn topology() -> PrimitiveTopology {
        wgpu::PrimitiveTopology::TriangleList
    }

    fn dirty(&self) -> bool {
        false
    }

    fn set_dirty(&mut self, _is_dirty: bool) {}
}

impl RenderableUi for UiImage {
    fn get_texture_path(&self) -> Option<String> {
        Some(self.image_path.clone())
    }
}