Minor [CanvasEffectProperty] generator tweaks

src/ComputeSharp.D2D1.UI.SourceGenerators/CanvasEffectPropertyGenerator.Execute.cs

@@ -46,6 +46,12 @@ public static bool IsCandidatePropertyDeclaration(SyntaxNode node, CancellationT
                 return false;
             }
 
+            // Static properties are not supported
+            if (property.Modifiers.Any(SyntaxKind.StaticKeyword))
+            {
+                return false;
+            }
+
             // The accessors must be a get and a set (with any accessibility)
             if (accessors[0].Kind() is not (SyntaxKind.GetAccessorDeclaration or SyntaxKind.SetAccessorDeclaration) ||
                 accessors[1].Kind() is not (SyntaxKind.GetAccessorDeclaration or SyntaxKind.SetAccessorDeclaration))
@@ -128,6 +134,11 @@ public static CanvasEffectInvalidationType GetCanvasEffectInvalidationType(Attri
             return CanvasEffectInvalidationType.Update;
         }
 
+        /// <summary>
+        /// Writes all implementations of partial effect property declarations.
+        /// </summary>
+        /// <param name="properties">The input set of declared effect properties.</param>
+        /// <param name="writer">The <see cref="IndentedTextWriter"/> instance to write into.</param>
         public static void WritePropertyDeclarations(EquatableArray<CanvasEffectPropertyInfo> properties, IndentedTextWriter writer)
         {
             // Helper to get the nullable type name for the initial property value
@@ -163,8 +174,10 @@ static string GetExpressionWithTrailingSpace(Accessibility accessibility)
 
                 writer.WriteLine("/// <inheritdoc/>");
                 writer.WriteGeneratedAttributes(GeneratorName);
-                writer.WriteLine($$"""                    
-                    {{GetExpressionWithTrailingSpace(propertyInfo.DeclaredAccessibility)}}partial {{propertyInfo.TypeNameWithNullabilityAnnotations}} {{propertyInfo.PropertyName}}
+                writer.Write(GetExpressionWithTrailingSpace(propertyInfo.DeclaredAccessibility));
+                writer.WriteIf(propertyInfo.IsRequired, "required ");
+                writer.WriteLine($"partial {propertyInfo.TypeNameWithNullabilityAnnotations} {propertyInfo.PropertyName}");
+                writer.WriteLine($$"""
                     {
                         {{GetExpressionWithTrailingSpace(propertyInfo.GetterAccessibility)}}get => field;
                         {{GetExpressionWithTrailingSpace(propertyInfo.SetterAccessibility)}}set

src/ComputeSharp.D2D1.UI.SourceGenerators/CanvasEffectPropertyGenerator.cs

@@ -63,7 +63,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
                     }
 
                     // Also ignore all properties that have an invalid declaration
-                    if (propertySymbol.IsStatic || propertySymbol.ReturnsByRef || propertySymbol.ReturnsByRefReadonly || propertySymbol.Type.IsRefLikeType)
+                    if (propertySymbol.ReturnsByRef || propertySymbol.ReturnsByRefReadonly || propertySymbol.Type.IsRefLikeType)
                     {
                         return default;
                     }
@@ -101,6 +101,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
                     // This will cover both reference types as well T when the constraints are not struct or unmanaged.
                     // If this is true, it means the field storage can potentially be in a null state (even if not annotated).
                     bool isReferenceTypeOrUnconstraindTypeParameter = !propertySymbol.Type.IsValueType;
+                    bool isRequired = propertySymbol.IsRequired;
 
                     // Finally, get the hierarchy too
                     HierarchyInfo hierarchyInfo = HierarchyInfo.From(typeSymbol);
@@ -115,6 +116,7 @@ public void Initialize(IncrementalGeneratorInitializationContext context)
                         SetterAccessibility: setterAccessibility,
                         TypeNameWithNullabilityAnnotations: typeNameWithNullabilityAnnotations,
                         IsReferenceTypeOrUnconstraindTypeParameter: isReferenceTypeOrUnconstraindTypeParameter,
+                        IsRequired: isRequired,
                         InvalidationType: invalidationType);
                 })
             .WithTrackingName(WellKnownTrackingNames.Execute)

src/ComputeSharp.D2D1.UI.SourceGenerators/Diagnostics/DiagnosticDescriptors.cs

@@ -80,7 +80,7 @@ internal static class DiagnosticDescriptors
         helpLinkUri: "https://github.com/Sergio0694/ComputeSharp");
 
     /// <summary>
-    /// Gets a <see cref="DiagnosticDescriptor"/> for a CanvasEffect property with invalid accessors.
+    /// Gets a <see cref="DiagnosticDescriptor"/> for a CanvasEffect property that is not an incomplete partial property definition.
     /// <para>
     /// Format: <c>"The property "{0}" is not an incomplete partial definition ([GeneratedCanvasEffectProperty] must be used on partial property definitions with no implementation part)"</c>.
     /// </para>
@@ -92,11 +92,11 @@ internal static class DiagnosticDescriptors
         category: DiagnosticCategory,
         defaultSeverity: DiagnosticSeverity.Error,
         isEnabledByDefault: true,
-        description: "A property using [GeneratedCanvasEffectProperty] is either not partial, or a partial implementation part ([GeneratedCanvasEffectProperty] must be used on partial property definitions with no implementation par).",
+        description: "A property using [GeneratedCanvasEffectProperty] is either not partial, or a partial implementation part ([GeneratedCanvasEffectProperty] must be used on partial property definitions with no implementation part).",
         helpLinkUri: "https://github.com/Sergio0694/ComputeSharp");
 
     /// <summary>
-    /// Gets a <see cref="DiagnosticDescriptor"/> for a CanvasEffect property with invalid accessors.
+    /// Gets a <see cref="DiagnosticDescriptor"/> for a CanvasEffect property that returns a ref value.
     /// <para>
     /// Format: <c>"The property "{0}" returns a value by reference ([GeneratedCanvasEffectProperty] must be used on properties returning a type by value)"</c>.
     /// </para>
@@ -112,7 +112,7 @@ internal static class DiagnosticDescriptors
         helpLinkUri: "https://github.com/Sergio0694/ComputeSharp");
 
     /// <summary>
-    /// Gets a <see cref="DiagnosticDescriptor"/> for a CanvasEffect property with invalid accessors.
+    /// Gets a <see cref="DiagnosticDescriptor"/> for a CanvasEffect property that returns a byref-like value.
     /// <para>
     /// Format: <c>"The property "{0}" returns a ref struct value ([GeneratedCanvasEffectProperty] must be used on properties with a type that is not a ref struct)"</c>.
     /// </para>
@@ -128,7 +128,7 @@ internal static class DiagnosticDescriptors
         helpLinkUri: "https://github.com/Sergio0694/ComputeSharp");
 
     /// <summary>
-    /// Gets a <see cref="DiagnosticDescriptor"/> for a CanvasEffect property with invalid accessors.
+    /// Gets a <see cref="DiagnosticDescriptor"/> for when C# is not set to 'preview'.
     /// <para>
     /// Format: <c>"Using [GeneratedCanvasEffectProperty] requires the C# language version to be set to 'preview', as support for the 'field' keyword is needed by the source generators to emit valid code (add &lt;LangVersion&gt;preview&lt;/LangVersion&gt; to your .csproj/.props file)"</c>.
     /// </para>

src/ComputeSharp.D2D1.UI.SourceGenerators/Models/CanvasEffectPropertyInfo.cs

@@ -17,6 +17,7 @@ namespace ComputeSharp.D2D1.WinUI.SourceGenerators.Models;
 /// <param name="SetterAccessibility">The accessibility of the <see langword="set"/> accessor, if available.</param>
 /// <param name="TypeNameWithNullabilityAnnotations">The type name for the generated property, including nullability annotations.</param>
 /// <param name="IsReferenceTypeOrUnconstraindTypeParameter">Indicates whether the property is of a reference type or an unconstrained type parameter.</param>
+/// <param name="IsRequired">Whether or not the generated property should be marked as required.</param>
 /// <param name="InvalidationType">The invalidation type to request.</param>
 internal sealed record CanvasEffectPropertyInfo(
     HierarchyInfo Hierarchy,
@@ -26,4 +27,5 @@ internal sealed record CanvasEffectPropertyInfo(
     Accessibility SetterAccessibility,
     string TypeNameWithNullabilityAnnotations,
     bool IsReferenceTypeOrUnconstraindTypeParameter,
+    bool IsRequired,
     CanvasEffectInvalidationType InvalidationType);

tests/ComputeSharp.D2D1.WinUI.Tests.SourceGenerators/Test_CanvasEffectPropertyGenerator.cs

@@ -344,6 +344,90 @@ private set
         VerifyGeneratedDiagnostics(source, ("MyNamespace.MyEffect.g.cs", result));
     }
 
+    [TestMethod]
+    public void SingleProperty_Required()
+    {
+        const string source = """
+            using ComputeSharp.D2D1.WinUI;
+
+            namespace MyNamespace;
+
+            public abstract partial class MyEffect : CanvasEffect
+            {
+                [GeneratedCanvasEffectProperty]
+                public required partial int Number { get; set; }
+            }
+            """;
+
+        const string result = """"
+            // <auto-generated/>
+            #pragma warning disable
+
+            namespace MyNamespace
+            {
+                /// <inheritdoc cref="MyEffect"/>
+                partial class MyEffect
+                {
+                    /// <inheritdoc/>
+                    [global::System.CodeDom.Compiler.GeneratedCode("ComputeSharp.D2D1.WinUI.CanvasEffectPropertyGenerator", <ASSEMBLY_VERSION>)]
+                    [global::System.Diagnostics.DebuggerNonUserCode]
+                    [global::System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
+                    public required partial int Number
+                    {
+                        get => field;
+                        set
+                        {
+                            if (global::System.Collections.Generic.EqualityComparer<int>.Default.Equals(field, value))
+                            {
+                                return;
+                            }
+
+                            int oldValue = field;
+
+                            OnNumberChanging(value);
+                            OnNumberChanging(oldValue, value);
+
+                            field = value;
+
+                            OnNumberChanged(value);
+                            OnNumberChanged(oldValue, value);
+
+                            InvalidateEffectGraph(global::ComputeSharp.D2D1.WinUI.CanvasEffectInvalidationType.Update);
+                        }
+                    }
+
+                    /// <summary>Executes the logic for when <see cref="Number"/> is changing.</summary>
+                    /// <param name="value">The new property value being set.</param>
+                    /// <remarks>This method is invoked right before the value of <see cref="Number"/> is changed.</remarks>
+                    [global::System.CodeDom.Compiler.GeneratedCode("ComputeSharp.D2D1.WinUI.CanvasEffectPropertyGenerator", <ASSEMBLY_VERSION>)]
+                    partial void OnNumberChanging(int newValue);
+
+                    /// <summary>Executes the logic for when <see cref="Number"/> is changing.</summary>
+                    /// <param name="oldValue">The previous property value that is being replaced.</param>
+                    /// <param name="newValue">The new property value being set.</param>
+                    /// <remarks>This method is invoked right before the value of <see cref="Number"/> is changed.</remarks>
+                    [global::System.CodeDom.Compiler.GeneratedCode("ComputeSharp.D2D1.WinUI.CanvasEffectPropertyGenerator", <ASSEMBLY_VERSION>)]
+                    partial void OnNumberChanging(int oldValue, int newValue);
+
+                    /// <summary>Executes the logic for when <see cref="Number"/> has just changed.</summary>
+                    /// <param name="value">The new property value that has been set.</param>
+                    /// <remarks>This method is invoked right after the value of <see cref="Number"/> is changed.</remarks>
+                    [global::System.CodeDom.Compiler.GeneratedCode("ComputeSharp.D2D1.WinUI.CanvasEffectPropertyGenerator", <ASSEMBLY_VERSION>)]
+                    partial void OnNumberChanged(int newValue);
+
+                    /// <summary>Executes the logic for when <see cref="Number"/> has just changed.</summary>
+                    /// <param name="oldValue">The previous property value that has been replaced.</param>
+                    /// <param name="newValue">The new property value that has been set.</param>
+                    /// <remarks>This method is invoked right after the value of <see cref="Number"/> is changed.</remarks>
+                    [global::System.CodeDom.Compiler.GeneratedCode("ComputeSharp.D2D1.WinUI.CanvasEffectPropertyGenerator", <ASSEMBLY_VERSION>)]
+                    partial void OnNumberChanged(int oldValue, int newValue);
+                }
+            }
+            """";
+
+        VerifyGeneratedDiagnostics(source, ("MyNamespace.MyEffect.g.cs", result));
+    }
+
     [TestMethod]
     public void MultipleProperties()
     {