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|
//! A rectangle with certain styled properties.
use crate::core::{Background, Rectangle};
use crate::graphics::gradient;
use bytemuck::{Pod, Zeroable};
/// The properties of a quad.
#[derive(Clone, Copy, Debug, Pod, Zeroable)]
#[repr(C)]
pub struct Quad {
/// The position of the [`Quad`].
pub position: [f32; 2],
/// The size of the [`Quad`].
pub size: [f32; 2],
/// The border color of the [`Quad`], in __linear RGB__.
pub border_color: [f32; 4],
/// The border radii of the [`Quad`].
pub border_radius: [f32; 4],
/// The border width of the [`Quad`].
pub border_width: f32,
}
/// A quad filled with a solid color.
#[derive(Clone, Copy, Debug, Pod, Zeroable)]
#[repr(C)]
pub struct Solid {
/// The background color data of the quad.
pub color: [f32; 4],
/// The [`Quad`] data of the [`Solid`].
pub quad: Quad,
}
/// A quad filled with interpolated colors.
#[derive(Clone, Copy, Debug)]
#[repr(C)]
pub struct Gradient {
/// The background gradient data of the quad.
pub gradient: gradient::Packed,
/// The [`Quad`] data of the [`Gradient`].
pub quad: Quad,
}
#[allow(unsafe_code)]
unsafe impl Pod for Gradient {}
#[allow(unsafe_code)]
unsafe impl Zeroable for Gradient {}
#[derive(Debug, Copy, Clone)]
/// The identifier of a quad, used for ordering.
pub enum Order {
/// A solid quad
Solid,
/// A gradient quad
Gradient,
}
/// A group of [`Quad`]s rendered together.
#[derive(Default, Debug)]
pub struct Layer {
/// The solid quads of the [`Layer`].
solids: Vec<Solid>,
/// The gradient quads of the [`Layer`].
gradients: Vec<Gradient>,
/// The quad order of the [`Layer`]; stored as a tuple of the quad type & its count.
order: Vec<(Order, usize)>,
/// The last index of quad ordering.
index: usize,
}
impl Layer {
/// Returns true if there are no quads of any type in [`Quads`].
pub fn is_empty(&self) -> bool {
self.solids.is_empty() && self.gradients.is_empty()
}
/// The [`Solid`] quads of the [`Layer`].
pub fn solids(&self) -> &[Solid] {
&self.solids
}
/// The [`Gradient`] quads of the [`Layer`].
pub fn gradients(&self) -> &[Gradient] {
&self.gradients
}
/// The order of quads within the [`Layer`], grouped by (type, count) for rendering in batches.
pub fn ordering(&self) -> &[(Order, usize)] {
&self.order
}
/// Adds a [`Quad`] with the provided `Background` type to the quad [`Layer`].
pub fn add(&mut self, quad: Quad, background: &Background) {
let quad_order = match background {
Background::Color(color) => {
self.solids.push(Solid {
color: color.into_linear(),
quad,
});
Order::Solid
}
Background::Gradient(gradient) => {
let quad = Gradient {
gradient: gradient::pack(
gradient,
Rectangle::new(quad.position.into(), quad.size.into()),
),
quad,
};
self.gradients.push(quad);
Order::Gradient
}
};
match (self.order.get_mut(self.index), quad_order) {
(Some((quad_order, count)), Order::Solid) => match quad_order {
Order::Solid => {
*count += 1;
}
Order::Gradient => {
self.order.push((Order::Solid, 1));
self.index += 1;
}
},
(Some((quad_order, count)), Order::Gradient) => match quad_order {
Order::Solid => {
self.order.push((Order::Gradient, 1));
self.index += 1;
}
Order::Gradient => {
*count += 1;
}
},
(None, _) => {
self.order.push((quad_order, 1));
}
}
}
}
|
