shader-rt: correct arg buffer handling

Firestar99 · Firestar99 · commit a8ba74e757ae · 2025-08-28T15:40:31.000+02:00
diff --git a/node-graph/gcore-shaders/src/blending.rs b/node-graph/gcore-shaders/src/blending.rs
@@ -66,7 +66,7 @@ impl AlphaBlending {
 }
 
 #[repr(i32)]
-#[derive(Debug, Default, Clone, Copy, Eq, PartialEq, Hash)]
+#[derive(Debug, Default, Clone, Copy, Eq, PartialEq, Hash, bytemuck::NoUninit)]
 #[cfg_attr(feature = "std", derive(dyn_any::DynAny, specta::Type, serde::Serialize, serde::Deserialize))]
 pub enum BlendMode {
 	// Basic group
diff --git a/node-graph/graster-nodes/src/adjustments.rs b/node-graph/graster-nodes/src/adjustments.rs
@@ -30,7 +30,7 @@ use num_traits::float::Float;
 // https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#:~:text=%27clrL%27%20%3D%20Color%20Lookup
 // https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#:~:text=Color%20Lookup%20(Photoshop%20CS6
 
-#[derive(Debug, Default, Clone, Copy, Eq, PartialEq, Hash, node_macro::ChoiceType)]
+#[derive(Debug, Default, Clone, Copy, Eq, PartialEq, Hash, node_macro::ChoiceType, bytemuck::NoUninit)]
 #[cfg_attr(feature = "std", derive(dyn_any::DynAny, specta::Type, serde::Serialize, serde::Deserialize))]
 #[widget(Dropdown)]
 #[repr(u32)]
@@ -560,7 +560,7 @@ pub enum RedGreenBlue {
 }
 
 /// Color Channel
-#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Hash, node_macro::ChoiceType)]
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq, Hash, node_macro::ChoiceType, bytemuck::NoUninit)]
 #[cfg_attr(feature = "std", derive(dyn_any::DynAny, specta::Type, serde::Serialize, serde::Deserialize))]
 #[widget(Radio)]
 #[repr(u32)]
diff --git a/node-graph/node-macro/src/shader_nodes/per_pixel_adjust.rs b/node-graph/node-macro/src/shader_nodes/per_pixel_adjust.rs
@@ -22,11 +22,11 @@ impl ShaderCodegen for PerPixelAdjust {
 	fn codegen(&self, parsed: &ParsedNodeFn, node_cfg: &TokenStream) -> syn::Result<ShaderTokens> {
 		let fn_name = &parsed.fn_name;
 
-		// categorize params and assign image bindings
-		// bindings for images start at 1
-		let params = {
-			let mut binding_cnt = 0;
-			parsed
+		let mut params;
+		let has_uniform;
+		{
+			// categorize params
+			params = parsed
 				.fields
 				.iter()
 				.map(|f| {
@@ -39,30 +39,50 @@ impl ShaderCodegen for PerPixelAdjust {
 							param_type: ParamType::Uniform,
 						}),
 						ParsedFieldType::Regular(RegularParsedField { gpu_image: true, .. }) => {
-							binding_cnt += 1;
-							Ok(Param {
+							let param = Param {
 								ident: Cow::Owned(format_ident!("image_{}", &ident.ident)),
 								ty: quote!(Image2d),
-								param_type: ParamType::Image { binding: binding_cnt },
-							})
+								param_type: ParamType::Image { binding: 0 },
+							};
+							Ok(param)
 						}
 					}
 				})
-				.collect::<syn::Result<Vec<_>>>()?
-		};
+				.collect::<syn::Result<Vec<_>>>()?;
+
+			has_uniform = params.iter().any(|p| matches!(p.param_type, ParamType::Uniform));
+
+			// assign image bindings
+			// if an arg_buffer exists, bindings for images start at 1 to leave 0 for arg buffer
+			let mut binding_cnt = if has_uniform { 1 } else { 0 };
+			for p in params.iter_mut() {
+				match &mut p.param_type {
+					ParamType::Image { binding } => {
+						*binding = binding_cnt;
+						binding_cnt += 1;
+					}
+					ParamType::Uniform => {}
+				}
+			}
+		}
 
 		let entry_point_mod = format_ident!("{}_gpu_entry_point", fn_name);
 		let entry_point_name_ident = format_ident!("ENTRY_POINT_NAME");
 		let entry_point_name = quote!(#entry_point_mod::#entry_point_name_ident);
+		let uniform_struct_ident = format_ident!("Uniform");
+		let uniform_struct = quote!(#entry_point_mod::#uniform_struct_ident);
 		let gpu_node_mod = format_ident!("{}_gpu", fn_name);
 
 		let codegen = PerPixelAdjustCodegen {
 			parsed,
 			node_cfg,
 			params,
+			has_uniform,
 			entry_point_mod,
 			entry_point_name_ident,
 			entry_point_name,
+			uniform_struct_ident,
+			uniform_struct,
 			gpu_node_mod,
 		};
 
@@ -77,9 +97,12 @@ pub struct PerPixelAdjustCodegen<'a> {
 	parsed: &'a ParsedNodeFn,
 	node_cfg: &'a TokenStream,
 	params: Vec<Param<'a>>,
+	has_uniform: bool,
 	entry_point_mod: Ident,
 	entry_point_name_ident: Ident,
 	entry_point_name: TokenStream,
+	uniform_struct_ident: Ident,
+	uniform_struct: TokenStream,
 	gpu_node_mod: Ident,
 }
 
@@ -114,6 +137,7 @@ impl PerPixelAdjustCodegen<'_> {
 
 		let entry_point_mod = &self.entry_point_mod;
 		let entry_point_name = &self.entry_point_name_ident;
+		let uniform_struct_ident = &self.uniform_struct_ident;
 		Ok(quote! {
 			pub mod #entry_point_mod {
 				use super::*;
@@ -125,8 +149,10 @@ impl PerPixelAdjustCodegen<'_> {
 
 				pub const #entry_point_name: &str = core::concat!(core::module_path!(), "::entry_point");
 
-				pub struct Uniform {
-					#(#uniform_members),*
+				#[repr(C)]
+				#[derive(Copy, Clone, bytemuck::NoUninit)]
+				pub struct #uniform_struct_ident {
+					#(pub #uniform_members),*
 				}
 
 				#[spirv(fragment)]
@@ -158,14 +184,26 @@ impl PerPixelAdjustCodegen<'_> {
 			.iter()
 			.map(|f| match &f.ty {
 				ParsedFieldType::Regular(reg @ RegularParsedField { gpu_image: true, .. }) => Ok(ParsedField {
+					pat_ident: PatIdent {
+						mutability: None,
+						by_ref: None,
+						..f.pat_ident.clone()
+					},
 					ty: ParsedFieldType::Regular(RegularParsedField {
 						ty: raster_gpu.clone(),
 						implementations: Punctuated::default(),
 						..reg.clone()
 					}),
 					..f.clone()
 				}),
-				ParsedFieldType::Regular(RegularParsedField { gpu_image: false, .. }) => Ok(f.clone()),
+				ParsedFieldType::Regular(RegularParsedField { gpu_image: false, .. }) => Ok(ParsedField {
+					pat_ident: PatIdent {
+						mutability: None,
+						by_ref: None,
+						..f.pat_ident.clone()
+					},
+					..f.clone()
+				}),
 				ParsedFieldType::Node { .. } => Err(syn::Error::new_spanned(&f.pat_ident, "PerPixelAdjust shader nodes cannot accept other nodes as generics")),
 			})
 			.collect::<syn::Result<Vec<_>>>()?;
@@ -211,14 +249,35 @@ impl PerPixelAdjustCodegen<'_> {
 		};
 		let gpu_image = &gpu_image_field.pat_ident.ident;
 
+		// uniform buffer struct construction
+		let has_uniform = self.has_uniform;
+		let uniform_buffer = if has_uniform {
+			let uniform_struct = &self.uniform_struct;
+			let uniform_members = self
+				.params
+				.iter()
+				.filter_map(|p| match p.param_type {
+					ParamType::Image { .. } => None,
+					ParamType::Uniform => Some(p.ident.as_ref()),
+				})
+				.collect::<Vec<_>>();
+			quote!(Some(&super::#uniform_struct {
+				#(#uniform_members),*
+			}))
+		} else {
+			// explicit generics placed here cause it's easier than explicitly writing `run_per_pixel_adjust::<()>`
+			quote!(Option::<&()>::None)
+		};
+
 		// node function body
 		let entry_point_name = &self.entry_point_name;
 		let body = quote! {
 			{
-				#wgpu_executor.shader_runtime.run_per_pixel_adjust(&::wgpu_executor::shader_runtime::Shaders {
+				#wgpu_executor.shader_runtime.run_per_pixel_adjust(&::wgpu_executor::shader_runtime::per_pixel_adjust_runtime::Shaders {
 					wgsl_shader: crate::WGSL_SHADER,
 					fragment_shader_name: super::#entry_point_name,
-				}, #gpu_image, &1u32).await
+					has_uniform: #has_uniform,
+				}, #gpu_image, #uniform_buffer).await
 			}
 		};
 
diff --git a/node-graph/wgpu-executor/src/shader_runtime/mod.rs b/node-graph/wgpu-executor/src/shader_runtime/mod.rs
@@ -18,8 +18,3 @@ impl ShaderRuntime {
 		}
 	}
 }
-
-pub struct Shaders<'a> {
-	pub wgsl_shader: &'a str,
-	pub fragment_shader_name: &'a str,
-}
diff --git a/node-graph/wgpu-executor/src/shader_runtime/per_pixel_adjust_runtime.rs b/node-graph/wgpu-executor/src/shader_runtime/per_pixel_adjust_runtime.rs
@@ -1,5 +1,5 @@
 use crate::Context;
-use crate::shader_runtime::{FULLSCREEN_VERTEX_SHADER_NAME, ShaderRuntime, Shaders};
+use crate::shader_runtime::{FULLSCREEN_VERTEX_SHADER_NAME, ShaderRuntime};
 use bytemuck::NoUninit;
 use futures::lock::Mutex;
 use graphene_core::raster_types::{GPU, Raster};
@@ -27,24 +27,33 @@ impl PerPixelAdjustShaderRuntime {
 }
 
 impl ShaderRuntime {
-	pub async fn run_per_pixel_adjust<T: NoUninit>(&self, shaders: &Shaders<'_>, textures: Table<Raster<GPU>>, args: &T) -> Table<Raster<GPU>> {
+	pub async fn run_per_pixel_adjust<T: NoUninit>(&self, shaders: &Shaders<'_>, textures: Table<Raster<GPU>>, args: Option<&T>) -> Table<Raster<GPU>> {
 		let mut cache = self.per_pixel_adjust.pipeline_cache.lock().await;
 		let pipeline = cache
 			.entry(shaders.fragment_shader_name.to_owned())
 			.or_insert_with(|| PerPixelAdjustGraphicsPipeline::new(&self.context, &shaders));
 
-		let device = &self.context.device;
-		let arg_buffer = device.create_buffer_init(&BufferInitDescriptor {
-			label: Some(&format!("{} arg buffer", pipeline.name.as_str())),
-			usage: BufferUsages::STORAGE,
-			contents: bytemuck::bytes_of(args),
+		let arg_buffer = args.map(|args| {
+			let device = &self.context.device;
+			device.create_buffer_init(&BufferInitDescriptor {
+				label: Some(&format!("{} arg buffer", pipeline.name.as_str())),
+				usage: BufferUsages::STORAGE,
+				contents: bytemuck::bytes_of(args),
+			})
 		});
-		pipeline.dispatch(&self.context, textures, &arg_buffer)
+		pipeline.dispatch(&self.context, textures, arg_buffer)
 	}
 }
 
+pub struct Shaders<'a> {
+	pub wgsl_shader: &'a str,
+	pub fragment_shader_name: &'a str,
+	pub has_uniform: bool,
+}
+
 pub struct PerPixelAdjustGraphicsPipeline {
 	name: String,
+	has_uniform: bool,
 	pipeline: wgpu::RenderPipeline,
 }
 
@@ -62,32 +71,46 @@ impl PerPixelAdjustGraphicsPipeline {
 			source: ShaderSource::Wgsl(Cow::Borrowed(info.wgsl_shader)),
 		});
 
+		let entries: &[_] = if info.has_uniform {
+			&[
+				BindGroupLayoutEntry {
+					binding: 0,
+					visibility: ShaderStages::FRAGMENT,
+					ty: BindingType::Buffer {
+						ty: BufferBindingType::Storage { read_only: true },
+						has_dynamic_offset: false,
+						min_binding_size: None,
+					},
+					count: None,
+				},
+				BindGroupLayoutEntry {
+					binding: 1,
+					visibility: ShaderStages::FRAGMENT,
+					ty: BindingType::Texture {
+						sample_type: TextureSampleType::Float { filterable: false },
+						view_dimension: TextureViewDimension::D2,
+						multisampled: false,
+					},
+					count: None,
+				},
+			]
+		} else {
+			&[BindGroupLayoutEntry {
+				binding: 0,
+				visibility: ShaderStages::FRAGMENT,
+				ty: BindingType::Texture {
+					sample_type: TextureSampleType::Float { filterable: false },
+					view_dimension: TextureViewDimension::D2,
+					multisampled: false,
+				},
+				count: None,
+			}]
+		};
 		let pipeline_layout = device.create_pipeline_layout(&PipelineLayoutDescriptor {
 			label: Some(&format!("PerPixelAdjust {} PipelineLayout", name)),
 			bind_group_layouts: &[&device.create_bind_group_layout(&BindGroupLayoutDescriptor {
 				label: Some(&format!("PerPixelAdjust {} BindGroupLayout 0", name)),
-				entries: &[
-					BindGroupLayoutEntry {
-						binding: 0,
-						visibility: ShaderStages::FRAGMENT,
-						ty: BindingType::Buffer {
-							ty: BufferBindingType::Storage { read_only: true },
-							has_dynamic_offset: false,
-							min_binding_size: None,
-						},
-						count: None,
-					},
-					BindGroupLayoutEntry {
-						binding: 1,
-						visibility: ShaderStages::FRAGMENT,
-						ty: BindingType::Texture {
-							sample_type: TextureSampleType::Float { filterable: false },
-							view_dimension: TextureViewDimension::D2,
-							multisampled: false,
-						},
-						count: None,
-					},
-				],
+				entries,
 			})],
 			push_constant_ranges: &[],
 		});
@@ -125,10 +148,15 @@ impl PerPixelAdjustGraphicsPipeline {
 			multiview: None,
 			cache: None,
 		});
-		Self { pipeline, name }
+		Self {
+			pipeline,
+			name,
+			has_uniform: info.has_uniform,
+		}
 	}
 
-	pub fn dispatch(&self, context: &Context, textures: Table<Raster<GPU>>, arg_buffer: &Buffer) -> Table<Raster<GPU>> {
+	pub fn dispatch(&self, context: &Context, textures: Table<Raster<GPU>>, arg_buffer: Option<Buffer>) -> Table<Raster<GPU>> {
+		assert_eq!(self.has_uniform, arg_buffer.is_some());
 		let device = &context.device;
 		let name = self.name.as_str();
 
@@ -140,11 +168,8 @@ impl PerPixelAdjustGraphicsPipeline {
 				let view_in = tex_in.create_view(&TextureViewDescriptor::default());
 				let format = tex_in.format();
 
-				let bind_group = device.create_bind_group(&BindGroupDescriptor {
-					label: Some(&format!("{name} bind group")),
-					// `get_bind_group_layout` allocates unnecessary memory, we could create it manually to not do that
-					layout: &self.pipeline.get_bind_group_layout(0),
-					entries: &[
+				let entries: &[_] = if let Some(arg_buffer) = arg_buffer.as_ref() {
+					&[
 						BindGroupEntry {
 							binding: 0,
 							resource: BindingResource::Buffer(BufferBinding {
@@ -157,7 +182,18 @@ impl PerPixelAdjustGraphicsPipeline {
 							binding: 1,
 							resource: BindingResource::TextureView(&view_in),
 						},
-					],
+					]
+				} else {
+					&[BindGroupEntry {
+						binding: 0,
+						resource: BindingResource::TextureView(&view_in),
+					}]
+				};
+				let bind_group = device.create_bind_group(&BindGroupDescriptor {
+					label: Some(&format!("{name} bind group")),
+					// `get_bind_group_layout` allocates unnecessary memory, we could create it manually to not do that
+					layout: &self.pipeline.get_bind_group_layout(0),
+					entries,
 				});
 
 				let tex_out = device.create_texture(&TextureDescriptor {

Original file line number	Diff line number	Diff line change
`@@ -66,7 +66,7 @@ impl AlphaBlending {`
`66`	`66`	`}`
`67`	`67`
`68`	`68`	`#[repr(i32)]`
`69`		`-#[derive(Debug, Default, Clone, Copy, Eq, PartialEq, Hash)]`
	`69`	`+#[derive(Debug, Default, Clone, Copy, Eq, PartialEq, Hash, bytemuck::NoUninit)]`
`70`	`70`	`#[cfg_attr(feature = "std", derive(dyn_any::DynAny, specta::Type, serde::Serialize, serde::Deserialize))]`
`71`	`71`	`pub enum BlendMode {`
`72`	`72`	`// Basic group`
Original file line number	Diff line number	Diff line change
`@@ -18,8 +18,3 @@ impl ShaderRuntime {`
`18`	`18`	`}`
`19`	`19`	`}`
`20`	`20`	`}`
`21`		`-`
`22`		`-pub struct Shaders<'a> {`
`23`		`- pub wgsl_shader: &'a str,`
`24`		`- pub fragment_shader_name: &'a str,`
`25`		`-}`