116 lines
3.3 KiB
Rust
116 lines
3.3 KiB
Rust
//! Draw primitives using custom pipelines.
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use crate::core::{Rectangle, Size};
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use std::any::{Any, TypeId};
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use std::collections::HashMap;
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use std::fmt::Debug;
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use std::sync::Arc;
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#[derive(Clone, Debug)]
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/// A custom primitive which can be used to render primitives associated with a custom pipeline.
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pub struct Pipeline {
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/// The bounds of the [`Pipeline`].
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pub bounds: Rectangle,
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/// The [`Primitive`] to render.
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pub primitive: Arc<dyn Primitive>,
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}
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impl Pipeline {
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/// Creates a new [`Pipeline`] with the given [`Primitive`].
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pub fn new(bounds: Rectangle, primitive: impl Primitive) -> Self {
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Pipeline {
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bounds,
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primitive: Arc::new(primitive),
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}
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}
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}
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impl PartialEq for Pipeline {
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fn eq(&self, other: &Self) -> bool {
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self.primitive.type_id() == other.primitive.type_id()
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}
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}
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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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format: wgpu::TextureFormat,
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device: &wgpu::Device,
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queue: &wgpu::Queue,
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bounds: Rectangle,
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target_size: Size<u32>,
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scale_factor: f32,
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storage: &mut Storage,
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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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storage: &Storage,
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target: &wgpu::TextureView,
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target_size: Size<u32>,
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viewport: Rectangle<u32>,
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encoder: &mut wgpu::CommandEncoder,
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);
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}
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/// A renderer than can draw custom pipeline primitives.
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pub trait Renderer: crate::core::Renderer {
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/// Draws a custom pipeline primitive.
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fn draw_pipeline_primitive(
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&mut self,
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bounds: Rectangle,
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primitive: impl Primitive,
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);
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}
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impl<Theme> Renderer for crate::Renderer<Theme> {
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fn draw_pipeline_primitive(
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&mut self,
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bounds: Rectangle,
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primitive: impl Primitive,
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) {
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self.draw_primitive(super::Primitive::Custom(super::Custom::Pipeline(
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Pipeline::new(bounds, primitive),
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)));
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}
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}
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/// Stores custom, user-provided pipelines.
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#[derive(Default, Debug)]
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pub struct Storage {
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pipelines: HashMap<TypeId, Box<dyn Any>>,
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}
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impl Storage {
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/// Returns `true` if `Storage` contains a pipeline with type `T`.
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pub fn has<T: 'static>(&self) -> bool {
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self.pipelines.get(&TypeId::of::<T>()).is_some()
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}
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/// Inserts the pipeline `T` in to [`Storage`].
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pub fn store<T: 'static>(&mut self, pipeline: T) {
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let _ = self.pipelines.insert(TypeId::of::<T>(), Box::new(pipeline));
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}
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/// Returns a reference to pipeline 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("Pipeline 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 pipeline `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("Pipeline with this type does not exist in Storage.")
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})
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}
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}
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