use std::mem::size_of;
use bytemuck::{Pod, Zeroable};
/// The vertices needed to form a square
pub const SQUARE: [Vertex; 6] = [
Vertex::new(-0.5, -0.5),
Vertex::new(0.5, -0.5),
Vertex::new(-0.5, 0.5),
Vertex::new(0.5, 0.5),
Vertex::new(-0.5, 0.5),
Vertex::new(0.5, -0.5),
];
/// A vertex that is usable by the alligator shader
#[repr(C)]
#[derive(Copy, Clone, Debug, PartialEq, Pod, Zeroable)]
pub struct Vertex {
position: [f32; 2],
}
impl Vertex {
// whenever this is updated, please also update `sprite.wgsl`
pub(crate) const ATTRIBUTES: [wgpu::VertexAttribute; 1] =
wgpu::vertex_attr_array![0 => Float32x2];
/// Create a new vertex
const fn new(x: f32, y: f32) -> Self {
Self { position: [x, y] }
}
pub(crate) const fn desc<'a>() -> wgpu::VertexBufferLayout<'a> {
wgpu::VertexBufferLayout {
array_stride: size_of::<Self>() as wgpu::BufferAddress,
step_mode: wgpu::VertexStepMode::Vertex,
attributes: &Self::ATTRIBUTES,
}
}
}
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