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//! Draw custom primitives.
use crate::core::{Rectangle, Size};
use crate::graphics::Transformation;
use std::any::{Any, TypeId};
use std::collections::HashMap;
use std::fmt::Debug;
/// Stores custom, user-provided pipelines.
#[derive(Default, Debug)]
pub struct Storage {
pipelines: HashMap<TypeId, Box<dyn Any>>,
}
impl Storage {
/// Returns `true` if `Storage` contains a pipeline with type `T`.
pub fn has<T: 'static>(&self) -> bool {
self.pipelines.get(&TypeId::of::<T>()).is_some()
}
/// Inserts the pipeline `T` in to [`Storage`].
pub fn store<T: 'static>(&mut self, pipeline: T) {
let _ = self.pipelines.insert(TypeId::of::<T>(), Box::new(pipeline));
}
/// Returns a reference to pipeline with type `T` if it exists in [`Storage`].
pub fn get<T: 'static>(&self) -> Option<&T> {
self.pipelines.get(&TypeId::of::<T>()).map(|pipeline| {
pipeline
.downcast_ref::<T>()
.expect("Pipeline with this type does not exist in Storage.")
})
}
/// Returns a mutable reference to pipeline `T` if it exists in [`Storage`].
pub fn get_mut<T: 'static>(&mut self) -> Option<&mut T> {
self.pipelines.get_mut(&TypeId::of::<T>()).map(|pipeline| {
pipeline
.downcast_mut::<T>()
.expect("Pipeline with this type does not exist in Storage.")
})
}
}
/// A set of methods which allows a [`Primitive`] to be rendered.
pub trait Primitive: Debug + Send + Sync + 'static {
/// Processes the [`Primitive`], allowing for GPU buffer allocation.
fn prepare(
&self,
format: wgpu::TextureFormat,
device: &wgpu::Device,
queue: &wgpu::Queue,
target_size: Size<u32>,
scale_factor: f32,
transform: Transformation,
storage: &mut Storage,
);
/// Renders the [`Primitive`].
fn render(
&self,
storage: &Storage,
bounds: Rectangle<u32>,
target: &wgpu::TextureView,
target_size: Size<u32>,
encoder: &mut wgpu::CommandEncoder,
);
}
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