Make the GPU render and dispatch pipelines synchronous

node-graph/libraries/wgpu-executor/src/lib.rs

@@ -9,7 +9,7 @@ use crate::texture_cache::TextureCache;
 use anyhow::Result;
 use core_types::Color;
 use core_types::color::SRGBA8;
-use futures::lock::Mutex;
+use std::sync::Mutex;
 use glam::UVec2;
 use graphene_application_io::{ApplicationIo, EditorApi};
 use raster_types::Texture;
@@ -19,7 +19,6 @@ use wgpu::{Origin3d, TextureAspect};
 
 pub use context::Context as WgpuContext;
 pub use context::ContextBuilder as WgpuContextBuilder;
-pub use pipeline::AsyncPipeline as AsyncWgpuPipeline;
 pub use pipeline::Pipeline as WgpuPipeline;
 pub use pipeline::PipelineCache as WgpuPipelineCache;
 pub use rendering::RenderContext;
@@ -68,8 +67,8 @@ impl<'a, T: ApplicationIo<Executor = WgpuExecutor>> From<&'a EditorApi<T>> for &
 }
 
 impl WgpuExecutor {
-	pub async fn render_vello_scene(&self, scene: &Scene, size: UVec2, context: &RenderContext, background: Option<Color>) -> Result<Texture> {
-		let texture = self.request_texture(size).await;
+	pub fn render_vello_scene(&self, scene: &Scene, size: UVec2, context: &RenderContext, background: Option<Color>) -> Result<Texture> {
+		let texture = self.request_texture(size);
 
 		let texture_view = texture.create_view(&wgpu::TextureViewDescriptor::default());
 
@@ -82,7 +81,7 @@ impl WgpuExecutor {
 		};
 
 		{
-			let mut renderer = self.inner.vello_renderer.lock().await;
+			let mut renderer = self.inner.vello_renderer.lock().unwrap();
 			for (image_brush, texture) in context.resource_overrides.iter() {
 				let texture_view = wgpu::TexelCopyTextureInfoBase {
 					texture: (**texture).clone(),
@@ -109,8 +108,8 @@ impl WgpuExecutor {
 		pipeline.init::<P>(self);
 	}
 
-	pub async fn request_texture(&self, size: UVec2) -> Texture {
-		self.inner.texture_cache.lock().await.request_texture(&self.context().device, size)
+	pub fn request_texture(&self, size: UVec2) -> Texture {
+		self.inner.texture_cache.lock().unwrap().request_texture(&self.context().device, size)
 	}
 }
 

node-graph/libraries/wgpu-executor/src/pipeline.rs

@@ -1,42 +1,16 @@
 use dyn_any::DynAny;
 use std::any::Any;
-use std::future::Future;
-use std::pin::Pin;
 use std::sync::{Arc, OnceLock};
 
 use crate::WgpuExecutor;
 
-pub type PipelineFuture<'a, T> = Pin<Box<dyn Future<Output = T> + Send + 'a>>;
-
 pub trait Pipeline: Any + Send + Sync + Sized {
 	type Args<'a>;
 	type Out: Send;
 
 	fn create(executor: &WgpuExecutor) -> Self;
 
-	fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> PipelineFuture<'a, Self::Out>;
-}
-
-pub trait AsyncPipeline: Any + Send + Sync + Sized {
-	type Args<'a>;
-	type Out: Send;
-
-	fn create(executor: &WgpuExecutor) -> Self;
-
-	fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> impl Future<Output = Self::Out> + Send + 'a;
-}
-
-impl<P: AsyncPipeline> Pipeline for P {
-	type Args<'a> = <P as AsyncPipeline>::Args<'a>;
-	type Out = <P as AsyncPipeline>::Out;
-
-	fn create(executor: &WgpuExecutor) -> Self {
-		<P as AsyncPipeline>::create(executor)
-	}
-
-	fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> PipelineFuture<'a, Self::Out> {
-		Box::pin(<P as AsyncPipeline>::run(self, executor, args))
-	}
+	fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> Self::Out;
 }
 
 #[derive(Default, Clone, DynAny)]
@@ -51,13 +25,13 @@ impl PipelineCache {
 		self.pipeline.get_or_init(|| Box::new(P::create(executor)));
 	}
 
-	pub async fn run<P: Pipeline>(&self, args: &P::Args<'_>) -> P::Out {
+	pub fn run<P: Pipeline>(&self, args: &P::Args<'_>) -> P::Out {
 		let executor = self.executor.get().expect("PipelineCache not initialized");
 		let entry = self.pipeline.get().expect("PipelineCache not initialized");
 		let pipeline = (&**entry)
 			.downcast_ref::<P>()
 			.unwrap_or_else(|| panic!("PipelineCache type mismatch: run::<{}>() but init used a different pipeline type", std::any::type_name::<P>(),));
-		pipeline.run(executor, args).await
+		pipeline.run(executor, args)
 	}
 }
 

node-graph/libraries/wgpu-executor/src/shader_runtime/per_pixel_adjust_runtime.rs

@@ -2,7 +2,7 @@ use crate::WgpuContext;
 use crate::shader_runtime::{FULLSCREEN_VERTEX_SHADER_NAME, ShaderRuntime};
 use core_types::list::{Item, List};
 use core_types::shaders::buffer_struct::BufferStruct;
-use futures::lock::Mutex;
+use std::sync::Mutex;
 use raster_types::{GPU, Raster};
 use std::borrow::Cow;
 use std::collections::HashMap;
@@ -33,8 +33,8 @@ impl PerPixelAdjustShaderRuntime {
 }
 
 impl ShaderRuntime {
-	pub async fn run_per_pixel_adjust<T: BufferStruct>(&self, shaders: &Shaders<'_>, textures: List<Raster<GPU>>, args: Option<&T>) -> List<Raster<GPU>> {
-		let mut cache = self.per_pixel_adjust.pipeline_cache.lock().await;
+	pub fn run_per_pixel_adjust<T: BufferStruct>(&self, shaders: &Shaders<'_>, textures: List<Raster<GPU>>, args: Option<&T>) -> List<Raster<GPU>> {
+		let mut cache = self.per_pixel_adjust.pipeline_cache.lock().unwrap();
 		let pipeline = cache
 			.entry(shaders.fragment_shader_name.to_owned())
 			.or_insert_with(|| PerPixelAdjustGraphicsPipeline::new(&self.context, shaders));

node-graph/node-macro/src/shader_nodes/per_pixel_adjust.rs

@@ -287,7 +287,7 @@ impl PerPixelAdjustCodegen<'_> {
 					wgsl_shader: crate::WGSL_SHADER,
 					fragment_shader_name: super::#entry_point_name,
 					has_uniform: #has_uniform,
-				}, #gpu_image, #uniform_buffer).await
+				}, #gpu_image, #uniform_buffer)
 			}
 		};
 
@@ -314,13 +314,12 @@ impl PerPixelAdjustCodegen<'_> {
 				context_features: self.parsed.input.context_features.clone(),
 			},
 			output_type: raster_gpu,
-			is_async: true,
+			is_async: false,
 			fields,
 			body,
 			description: self.parsed.description.clone(),
 		};
 		parsed_node_fn.replace_impl_trait_in_input();
-		parsed_node_fn.inject_async_source_fields(self.crate_ident.gcore()?);
 		let gpu_node_impl = crate::codegen::generate_node_code(self.crate_ident, &parsed_node_fn)?;
 
 		// wrap node in `mod #gpu_node_mod`

node-graph/nodes/gstd/src/platform_application_io.rs

@@ -10,6 +10,8 @@ use core_types::math::bbox::Bbox;
 use core_types::transform::Footprint;
 #[cfg(target_family = "wasm")]
 use core_types::{ATTR_EDITOR_MERGED_LAYERS, ATTR_TRANSFORM, WasmNotSend};
+use core_types::gpoll::GPoll;
+use core_types::runtime::SourceFuture;
 use core_types::{Color, Ctx};
 pub use graph_craft::application_io::resource::{Resource, ResourceHash};
 pub use graph_craft::application_io::*;
@@ -267,10 +269,16 @@ pub fn editor_api<'a>(_: impl Ctx, #[scope("editor-api")] editor_api: &'a Platfo
 }
 
 #[node_macro::node(category(""))]
-pub async fn resource<'a>(_: impl Ctx, hash: ResourceHash, #[scope(editor_api::IDENTIFIER)] editor_api: &'a PlatformEditorApi) -> Resource {
-	let application_io = editor_api.application_io.as_ref().expect("ApplicationIo must be available when using resources");
-	application_io.load_resource(hash).await.unwrap_or_else(|| {
-		panic!("Resource {hash} not found");
+pub fn resource<'a>(_: impl Ctx, hash: ResourceHash, #[scope(editor_api::IDENTIFIER)] editor_api: &'a PlatformEditorApi) -> SourceFuture<GPoll<Resource>> {
+	let application_io = editor_api.application_io.clone();
+	Box::pin(async move {
+		let Some(application_io) = application_io else {
+			return GPoll::error("ApplicationIo not available");
+		};
+		match application_io.load_resource(hash).await {
+			Some(resource) => GPoll::Final(resource),
+			None => GPoll::error("resource not found"),
+		}
 	})
 }
 

node-graph/nodes/gstd/src/render_background.rs

@@ -9,7 +9,7 @@ use graphic_types::raster_types::Texture;
 use rendering::{RenderParams, SvgRender, SvgRenderOutput};
 use std::fmt::Write;
 use wgpu::util::DeviceExt;
-use wgpu_executor::{AsyncWgpuPipeline, WgpuExecutor, WgpuPipelineCache};
+use wgpu_executor::{WgpuExecutor, WgpuPipeline, WgpuPipelineCache};
 
 #[node_macro::node(category(""))]
 fn render_background<'a>(
@@ -35,14 +35,12 @@ fn render_background<'a>(
 	let data = match foreground_data {
 		RenderOutputType::Texture(foreground_texture) => {
 			let doc_to_screen = render_params.footprint.transform.as_affine2();
-			let blended = pipeline
-				.run::<CompositeBackground>(&CompositeBackgroundArgs {
-					foreground: foreground_texture.as_ref(),
-					backgrounds: &metadata.backgrounds,
-					document_to_screen: doc_to_screen,
-					zoom: render_params.viewport_zoom.to_f32(),
-				})
-				.await;
+			let blended = pipeline.run::<CompositeBackground>(&CompositeBackgroundArgs {
+				foreground: foreground_texture.as_ref(),
+				backgrounds: &metadata.backgrounds,
+				document_to_screen: doc_to_screen,
+				zoom: render_params.viewport_zoom.to_f32(),
+			});
 
 			RenderOutputType::Texture(blended)
 		}
@@ -148,7 +146,7 @@ pub struct CompositeBackgroundArgs<'a> {
 	zoom: f32,
 }
 
-impl AsyncWgpuPipeline for CompositeBackground {
+impl WgpuPipeline for CompositeBackground {
 	type Args<'a> = CompositeBackgroundArgs<'a>;
 	type Out = Texture;
 
@@ -331,7 +329,7 @@ impl AsyncWgpuPipeline for CompositeBackground {
 		}
 	}
 
-	async fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> Self::Out {
+	fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> Self::Out {
 		let &CompositeBackgroundArgs {
 			foreground,
 			backgrounds,
@@ -340,7 +338,7 @@ impl AsyncWgpuPipeline for CompositeBackground {
 		} = args;
 
 		let foreground_size = foreground.size();
-		let output = executor.request_texture(UVec2::new(foreground_size.width, foreground_size.height)).await;
+		let output = executor.request_texture(UVec2::new(foreground_size.width, foreground_size.height));
 
 		if zoom <= 0. {
 			return output;

node-graph/nodes/gstd/src/render_cache.rs

@@ -1,8 +1,9 @@
 //! Tile-based render caching for efficient viewport panning.
 
+use core_types::gpoll::Interrupt;
 use core_types::math::bbox::AxisAlignedBbox;
 use core_types::transform::{Footprint, RenderQuality, Transform};
-use core_types::{CloneVarArgs, Context, Ctx, ExtractAll, ExtractAnimationTime, ExtractPointerPosition, ExtractRealTime, OwnedContextImpl};
+use core_types::{Context, Ctx, DeriveCtx, ExtractAll};
 use glam::{DAffine2, DVec2, IVec2, UVec2};
 use graph_craft::application_io::PlatformEditorApi;
 use graph_craft::document::value::{RenderOutput, RenderOutputType};
@@ -321,25 +322,23 @@ fn flood_fill(start: &TileCoord, tile_set: &HashSet<TileCoord>, visited: &mut Ha
 }
 
 #[node_macro::node(category(""))]
-pub async fn render_output_cache<'a>(
-	ctx: impl Ctx + ExtractAll + CloneVarArgs + ExtractRealTime + ExtractAnimationTime + ExtractPointerPosition + Sync,
+pub fn render_output_cache<'a>(
+	ctx: impl Ctx + ExtractAll + DeriveCtx,
 	#[scope(crate::platform_application_io::try_wgpu_executor::IDENTIFIER)] executor: Option<&'a WgpuExecutor>,
 	#[scope(crate::platform_application_io::editor_api::IDENTIFIER)] editor_api: &'a PlatformEditorApi,
-	data: impl Node<Context<'_>, Output = RenderOutput> + Send + Sync,
+	data: impl Node<Context<'_>, Output = RenderOutput>,
 	#[data] tile_cache: TileCache,
-) -> RenderOutput {
-	let footprint = ctx.footprint();
+) -> Result<RenderOutput, Interrupt> {
+	let footprint = *ctx.footprint();
 	let Some(render_params) = ctx.vararg(0).ok().and_then(|v| v.downcast_ref::<RenderParams>()) else {
 		log::warn!("render_output_cache: missing or invalid render params, falling back to direct render");
-		let context = OwnedContextImpl::from(ctx.clone()).with_footprint(*footprint);
-		return data.eval(context.into_context()).await;
+		return data.eval(&ctx.derived());
 	};
 
 	// Fall back to direct render for non-Vello or zero-size viewports
 	let physical_resolution = footprint.resolution;
 	if !matches!(render_params.render_output_type, RenderOutputTypeRequest::Vello) || physical_resolution.x == 0 || physical_resolution.y == 0 {
-		let context = OwnedContextImpl::from(ctx.clone()).with_footprint(*footprint).with_vararg(Box::new(render_params.clone()));
-		return data.eval(context.into_context()).await;
+		return data.eval(&ctx.derived());
 	}
 
 	let zoom = footprint.scale_magnitudes().x;
@@ -375,8 +374,38 @@ pub async fn render_output_cache<'a>(
 		if missing_region.tiles.is_empty() {
 			continue;
 		}
-		let region = render_missing_region(missing_region, |ctx| data.eval(ctx), ctx.clone(), render_params, &footprint.transform, &device_origin_offset).await;
-		new_regions.push(region);
+		let min_tile = missing_region.tiles.iter().fold(IVec2::new(i32::MAX, i32::MAX), |acc, t| acc.min(IVec2::new(t.x, t.y)));
+		let max_tile = missing_region.tiles.iter().fold(IVec2::new(i32::MIN, i32::MIN), |acc, t| acc.max(IVec2::new(t.x, t.y)));
+
+		let tile_count = (max_tile - min_tile) + IVec2::ONE;
+		let region_pixel_size = (tile_count * TILE_SIZE as i32).as_uvec2();
+
+		let tile_global_offset = min_tile.as_dvec2() * TILE_SIZE as f64 + device_origin_offset;
+		let region_transform = DAffine2::from_translation(-tile_global_offset) * footprint.transform;
+		let region_footprint = Footprint {
+			transform: region_transform,
+			resolution: region_pixel_size,
+			quality: RenderQuality::Full,
+		};
+
+		let mut result = data.eval(&ctx.with_footprint(&region_footprint))?;
+
+		let RenderOutputType::Texture(texture) = result.data else {
+			unreachable!("render_output_cache: expected texture output from Vello render");
+		};
+
+		result.metadata.apply_transform(region_transform.inverse());
+
+		let memory_size = (region_pixel_size.x * region_pixel_size.y) as usize * BYTES_PER_PIXEL;
+
+		new_regions.push(CachedRegion {
+			texture,
+			texture_size: region_pixel_size,
+			tiles: missing_region.tiles.clone(),
+			metadata: result.metadata,
+			last_access: 0,
+			memory_size,
+		});
 	}
 
 	tile_cache.store_regions(new_regions.clone());
@@ -385,68 +414,18 @@ pub async fn render_output_cache<'a>(
 
 	// If no regions, fall back to direct render
 	if all_regions.is_empty() {
-		let context = OwnedContextImpl::from(ctx.clone()).with_footprint(*footprint).with_vararg(Box::new(render_params.clone()));
-		return data.eval(context.into_context()).await;
+		return data.eval(&ctx.derived());
 	}
 
 	let executor = executor.expect("GPU executor not available");
-	let output_texture = executor.request_texture(physical_resolution).await;
+	let output_texture = executor.request_texture(physical_resolution);
 
 	let combined_metadata = composite_cached_regions(&all_regions, &output_texture, &device_origin_offset, &footprint.transform, executor);
 
-	RenderOutput {
+	Ok(RenderOutput {
 		data: RenderOutputType::Texture(output_texture),
 		metadata: combined_metadata,
-	}
-}
-
-async fn render_missing_region<F, Fut>(
-	region: &RenderRegion,
-	render_fn: F,
-	ctx: impl Ctx + ExtractAll + CloneVarArgs,
-	render_params: &RenderParams,
-	viewport_transform: &DAffine2,
-	viewport_origin_offset: &DVec2,
-) -> CachedRegion
-where
-	F: Fn(Context<'_>) -> Fut,
-	Fut: std::future::Future<Output = RenderOutput>,
-{
-	let min_tile = region.tiles.iter().fold(IVec2::new(i32::MAX, i32::MAX), |acc, t| acc.min(IVec2::new(t.x, t.y)));
-	let max_tile = region.tiles.iter().fold(IVec2::new(i32::MIN, i32::MIN), |acc, t| acc.max(IVec2::new(t.x, t.y)));
-
-	let tile_count = (max_tile - min_tile) + IVec2::ONE;
-	let region_pixel_size = (tile_count * TILE_SIZE as i32).as_uvec2();
-
-	let tile_global_offset = min_tile.as_dvec2() * TILE_SIZE as f64 + *viewport_origin_offset;
-	let region_transform = DAffine2::from_translation(-tile_global_offset) * *viewport_transform;
-	let region_footprint = Footprint {
-		transform: region_transform,
-		resolution: region_pixel_size,
-		quality: RenderQuality::Full,
-	};
-
-	let region_params = render_params.clone();
-	let region_ctx = OwnedContextImpl::from(ctx).with_footprint(region_footprint).with_vararg(Box::new(region_params)).into_context();
-	let mut result = render_fn(region_ctx).await;
-
-	let RenderOutputType::Texture(texture) = result.data else {
-		unreachable!("render_missing_region: expected texture output from Vello render");
-	};
-
-	let pixel_to_document = region_transform.inverse();
-	result.metadata.apply_transform(pixel_to_document);
-
-	let memory_size = (region_pixel_size.x * region_pixel_size.y) as usize * BYTES_PER_PIXEL;
-
-	CachedRegion {
-		texture,
-		texture_size: region_pixel_size,
-		tiles: region.tiles.clone(),
-		metadata: result.metadata,
-		last_access: 0,
-		memory_size,
-	}
+	})
 }
 
 fn composite_cached_regions(

node-graph/nodes/gstd/src/render_node.rs

@@ -131,7 +131,6 @@ fn render<'a>(
 			let texture = executor
 				.expect("GPU executor not available")
 				.render_vello_scene(&transformed_scene, footprint.resolution, context, None)
-				.await
 				.expect("Failed to render Vello scene");
 			RenderOutputType::Texture(texture)
 		}

node-graph/nodes/gstd/src/render_pixel_preview.rs

@@ -1,22 +1,22 @@
+use core_types::gpoll::Interrupt;
 use core_types::transform::{Footprint, Transform};
-use core_types::{CloneVarArgs, Context, Ctx, ExtractAll, OwnedContextImpl};
+use core_types::{Context, Ctx, DeriveCtx, ExtractAll};
 use glam::{DAffine2, DVec2, UVec2, Vec2};
 use graph_craft::document::value::{RenderOutput, RenderOutputType};
 use graphic_types::raster_types::Texture;
 use rendering::{RenderOutputType as RenderOutputTypeRequest, RenderParams};
 use vector_types::vector::style::RenderMode;
-use wgpu_executor::{AsyncWgpuPipeline, WgpuExecutor, WgpuPipelineCache};
+use wgpu_executor::{WgpuExecutor, WgpuPipeline, WgpuPipelineCache};
 
 #[node_macro::node(category(""))]
-pub async fn render_pixel_preview<'a>(
-	ctx: impl Ctx + ExtractAll + CloneVarArgs + Sync,
+pub fn render_pixel_preview(
+	ctx: impl Ctx + ExtractAll + DeriveCtx,
 	#[scope(pixel_preview_pipeline::IDENTIFIER)] pipeline: WgpuPipelineCache,
-	data: impl Node<Context<'_>, Output = RenderOutput> + Send + Sync,
-) -> RenderOutput {
+	data: impl Node<Context<'_>, Output = RenderOutput>,
+) -> Result<RenderOutput, Interrupt> {
 	let Some(render_params) = ctx.vararg(0).ok().and_then(|v| v.downcast_ref::<RenderParams>()).cloned() else {
 		log::error!("invalid render params for pixel preview");
-		let context = OwnedContextImpl::from(ctx).into_context();
-		return data.eval(context).await;
+		return data.eval(&ctx.derived());
 	};
 	let physical_scale = render_params.scale;
 
@@ -24,8 +24,7 @@ pub async fn render_pixel_preview<'a>(
 	let viewport_zoom = footprint.scale_magnitudes().x;
 
 	if render_params.render_mode != RenderMode::PixelPreview || !matches!(render_params.render_output_type, RenderOutputTypeRequest::Vello) || viewport_zoom <= 1. {
-		let context = OwnedContextImpl::from(ctx).into_context();
-		return data.eval(context).await;
+		return data.eval(&ctx.derived());
 	}
 
 	let physical_resolution = footprint.resolution;
@@ -51,27 +50,25 @@ pub async fn render_pixel_preview<'a>(
 		quality: footprint.quality,
 	};
 
-	let new_ctx = OwnedContextImpl::from(ctx).with_footprint(upstream_footprint).with_vararg(Box::new(render_params)).into_context();
-	let mut result = data.eval(new_ctx).await;
+	let scoped = ctx.push_vararg(&render_params);
+	let mut result = data.eval(&scoped.ctx().with_footprint(&upstream_footprint))?;
 
-	let RenderOutputType::Texture(ref source_texture) = result.data else { return result };
+	let RenderOutputType::Texture(ref source_texture) = result.data else { return Ok(result) };
 
 	let logical_transform = DAffine2::from_scale(DVec2::splat(1. / physical_scale)) * footprint.transform;
 	let transform = DAffine2::from_translation(-upstream_min) * logical_transform.inverse() * DAffine2::from_scale(logical_resolution);
 
-	let resampled = pipeline
-		.run::<PixelPreview>(&PixelPreviewArgs {
-			source: source_texture.as_ref(),
-			transform: &transform,
-			size: physical_resolution,
-		})
-		.await;
+	let resampled = pipeline.run::<PixelPreview>(&PixelPreviewArgs {
+		source: source_texture.as_ref(),
+		transform: &transform,
+		size: physical_resolution,
+	});
 
 	result.data = RenderOutputType::Texture(resampled);
 
 	result.metadata.apply_transform(footprint.transform * DAffine2::from_translation(upstream_min));
 
-	result
+	Ok(result)
 }
 
 #[node_macro::node(category(""), inject_scope)]
@@ -97,7 +94,7 @@ pub struct PixelPreviewArgs<'a> {
 	size: UVec2,
 }
 
-impl AsyncWgpuPipeline for PixelPreview {
+impl WgpuPipeline for PixelPreview {
 	type Args<'a> = PixelPreviewArgs<'a>;
 	type Out = Texture;
 
@@ -169,11 +166,11 @@ impl AsyncWgpuPipeline for PixelPreview {
 		PixelPreview { pipeline, bind_group_layout }
 	}
 
-	async fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> Self::Out {
+	fn run<'a>(&'a self, executor: &'a WgpuExecutor, args: &'a Self::Args<'_>) -> Self::Out {
 		let context = &executor.context();
 		let &PixelPreviewArgs { source, transform, size } = args;
 
-		let output = executor.request_texture(size).await;
+		let output = executor.request_texture(size);
 
 		let source_view = source.create_view(&wgpu::TextureViewDescriptor::default());
 		let output_view = output.create_view(&wgpu::TextureViewDescriptor::default());