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//! A collection of triangle primitives.
use crate::gradient::Gradient;
use crate::{triangle, Color, Point, Rectangle};
/// A mesh of triangles.
#[derive(Debug, Clone, Copy)]
pub struct Mesh<'a> {
/// The origin of the vertices of the [`Mesh`].
pub origin: Point,
/// The vertex and index buffers of the [`Mesh`].
pub buffers: &'a triangle::Mesh2D,
/// The clipping bounds of the [`Mesh`].
pub clip_bounds: Rectangle<f32>,
/// The shader of the [`Mesh`].
pub style: &'a Style,
}
#[derive(Debug, Clone, PartialEq)]
/// Supported shaders for primitives.
pub enum Style {
/// Fill a primitive with a solid color.
Solid(Color),
/// Fill a primitive with an interpolated color.
Gradient(Gradient),
}
impl From<Gradient> for Style {
fn from(gradient: Gradient) -> Self {
Self::Gradient(gradient)
}
}
/// Returns the number of total vertices & total indices of all [`Mesh`]es.
pub fn attribute_count_of<'a>(meshes: &'a [Mesh<'a>]) -> (usize, usize) {
meshes
.iter()
.map(|Mesh { buffers, .. }| {
(buffers.vertices.len(), buffers.indices.len())
})
.fold((0, 0), |(total_v, total_i), (v, i)| {
(total_v + v, total_i + i)
})
}
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