95 lines
2.7 KiB
Rust
95 lines
2.7 KiB
Rust
//! Draw custom primitives.
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use crate::core::{self, Rectangle};
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use crate::graphics::Viewport;
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use rustc_hash::FxHashMap;
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use std::any::{Any, TypeId};
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use std::fmt::Debug;
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/// A batch of primitives.
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pub type Batch = Vec<Instance>;
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/// A set of methods which allows a [`Primitive`] to be rendered.
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pub trait Primitive: Debug + Send + Sync + 'static {
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/// Processes the [`Primitive`], allowing for GPU buffer allocation.
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fn prepare(
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&self,
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device: &wgpu::Device,
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queue: &wgpu::Queue,
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format: wgpu::TextureFormat,
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storage: &mut Storage,
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bounds: &Rectangle,
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viewport: &Viewport,
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);
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/// Renders the [`Primitive`].
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fn render(
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&self,
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encoder: &mut wgpu::CommandEncoder,
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storage: &Storage,
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target: &wgpu::TextureView,
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clip_bounds: &Rectangle<u32>,
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);
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}
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#[derive(Debug)]
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/// An instance of a specific [`Primitive`].
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pub struct Instance {
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/// The bounds of the [`Instance`].
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pub bounds: Rectangle,
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/// The [`Primitive`] to render.
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pub primitive: Box<dyn Primitive>,
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}
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impl Instance {
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/// Creates a new [`Instance`] with the given [`Primitive`].
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pub fn new(bounds: Rectangle, primitive: impl Primitive) -> Self {
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Instance {
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bounds,
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primitive: Box::new(primitive),
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}
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}
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}
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/// A renderer than can draw custom primitives.
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pub trait Renderer: core::Renderer {
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/// Draws a custom primitive.
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fn draw_primitive(&mut self, bounds: Rectangle, primitive: impl Primitive);
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}
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/// Stores custom, user-provided types.
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#[derive(Default, Debug)]
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pub struct Storage {
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pipelines: FxHashMap<TypeId, Box<dyn Any + Send + Sync>>,
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}
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impl Storage {
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/// Returns `true` if `Storage` contains a type `T`.
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pub fn has<T: 'static>(&self) -> bool {
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self.pipelines.contains_key(&TypeId::of::<T>())
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}
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/// Inserts the data `T` in to [`Storage`].
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pub fn store<T: 'static + Send + Sync>(&mut self, data: T) {
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let _ = self.pipelines.insert(TypeId::of::<T>(), Box::new(data));
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}
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/// Returns a reference to the data with type `T` if it exists in [`Storage`].
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pub fn get<T: 'static>(&self) -> Option<&T> {
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self.pipelines.get(&TypeId::of::<T>()).map(|pipeline| {
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pipeline
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.downcast_ref::<T>()
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.expect("Value with this type does not exist in Storage.")
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})
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}
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/// Returns a mutable reference to the data with type `T` if it exists in [`Storage`].
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pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T> {
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self.pipelines.get_mut(&TypeId::of::<T>()).map(|pipeline| {
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pipeline
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.downcast_mut::<T>()
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.expect("Value with this type does not exist in Storage.")
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})
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}
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}
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