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