setup render textures

src/app.rs

@@ -0,0 +1,69 @@
+use bevy::{
+	asset::RenderAssetUsages,
+	prelude::*,
+	render::{
+		RenderApp,
+		render_resource::{Extent3d, TextureDimension, TextureFormat, TextureUsages},
+	},
+	window::PrimaryWindow,
+};
+pub struct Blackhole;
+
+impl Plugin for Blackhole {
+	fn build(&self, app: &mut App) {
+		app.register_type::<RenderTextures>();
+
+		app.add_systems(Startup, setup);
+
+		let render_app = app.sub_app_mut(RenderApp);
+
+		render_app.add_systems(Startup, init_pipeline);
+	}
+}
+
+#[derive(Resource, Reflect)]
+#[reflect(Resource)]
+struct RenderTextures(pub Handle<Image>, pub Handle<Image>);
+
+fn setup(mut commands: Commands, mut images: ResMut<Assets<Image>>, window: Single<&Window, With<PrimaryWindow>>) {
+	let size = window.physical_size();
+
+	let extent = Extent3d {
+		width: size.x,
+		height: size.y,
+		..Default::default()
+	};
+
+	const PIXEL_FORMAT: TextureFormat = TextureFormat::Rgba32Float;
+	const PIXEL_SIZE: usize = 16;
+	let mut image = Image::new_fill(
+		extent,
+		TextureDimension::D2,
+		&[0; PIXEL_SIZE],
+		PIXEL_FORMAT,
+		RenderAssetUsages::RENDER_WORLD,
+	);
+	image.texture_descriptor.usage = TextureUsages::TEXTURE_BINDING
+		| TextureUsages::STORAGE_BINDING
+		| TextureUsages::COPY_DST
+		| TextureUsages::RENDER_ATTACHMENT;
+
+	let img0 = images.add(image.clone());
+	let img1 = images.add(image);
+
+	commands.spawn((
+		Name::new("Render Sprite"),
+		Sprite {
+			image: img0.clone(),
+			custom_size: Some(size.as_vec2()),
+			..default()
+		},
+		Transform::from_translation(Vec3::ZERO),
+	));
+
+	commands.spawn(Camera2d);
+
+	commands.insert_resource(RenderTextures(img0, img1));
+}
+
+fn init_pipeline(mut commands: Commands) {}