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//! Draw triangles!
use crate::color;
use crate::core::{Rectangle, Size};
use crate::gradient;
use crate::Damage;
use bytemuck::{Pod, Zeroable};
/// A low-level primitive to render a mesh of triangles.
#[derive(Debug, Clone, PartialEq)]
pub enum Mesh {
/// A mesh with a solid color.
Solid {
/// The vertices and indices of the mesh.
buffers: Indexed<SolidVertex2D>,
/// The size of the drawable region of the mesh.
///
/// Any geometry that falls out of this region will be clipped.
size: Size,
},
/// A mesh with a gradient.
Gradient {
/// The vertices and indices of the mesh.
buffers: Indexed<GradientVertex2D>,
/// The size of the drawable region of the mesh.
///
/// Any geometry that falls out of this region will be clipped.
size: Size,
},
}
impl Damage for Mesh {
fn bounds(&self) -> Rectangle {
match self {
Self::Solid { size, .. } | Self::Gradient { size, .. } => {
Rectangle::with_size(*size)
}
}
}
}
/// A set of [`Vertex2D`] and indices representing a list of triangles.
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Indexed<T> {
/// The vertices of the mesh
pub vertices: Vec<T>,
/// The list of vertex indices that defines the triangles of the mesh.
///
/// Therefore, this list should always have a length that is a multiple of 3.
pub indices: Vec<u32>,
}
/// A two-dimensional vertex with a color.
#[derive(Copy, Clone, Debug, PartialEq, Zeroable, Pod)]
#[repr(C)]
pub struct SolidVertex2D {
/// The vertex position in 2D space.
pub position: [f32; 2],
/// The color of the vertex in __linear__ RGBA.
pub color: color::Packed,
}
/// A vertex which contains 2D position & packed gradient data.
#[derive(Copy, Clone, Debug, PartialEq, Zeroable, Pod)]
#[repr(C)]
pub struct GradientVertex2D {
/// The vertex position in 2D space.
pub position: [f32; 2],
/// The packed vertex data of the gradient.
pub gradient: gradient::Packed,
}
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