public override void VisitVariableDeclaration(VariableDeclarationSyntax node) { if (node.Variables.Count != 1) { throw new ShaderGenerationException("Cannot declare multiple variables together."); } VariableDeclaratorSyntax vds = node.Variables[0]; string resourceName = vds.Identifier.Text; TypeInfo typeInfo = GetModel(node).GetTypeInfo(node.Type); string fullTypeName = GetModel(node).GetFullTypeName(node.Type); TypeReference valueType = new TypeReference(fullTypeName, typeInfo.Type); ShaderResourceKind kind = ClassifyResourceKind(fullTypeName); var structure = _backends.Select(b => b.GetContext(_shaderSet.Name).Structures .FirstOrDefault(s => SymbolEqualityComparer.Default.Equals(s.Type, typeInfo.Type))) .FirstOrDefault(); if (structure != null && structure.Fields.Any(f => f.IsBuiltIn)) { kind = ShaderResourceKind.BuiltIn; } ShaderBuiltin builtin = default; if (kind == ShaderResourceKind.Uniform) { if (node.Parent is FieldDeclarationSyntax field) { if (field.Modifiers.Any(f => f.IsKind(SyntaxKind.PrivateKeyword))) { kind = ShaderResourceKind.Local; } else if (field.AttributeLists.Any(l => l.Attributes.Any(a => a.Name.ToString().Contains("Semantic")))) { kind = ShaderResourceKind.BuiltIn; SemanticType semanticType = GetSemanticType(vds); if (semanticType == SemanticType.None) { var geometrySemantic = GetGeometrySemantic(vds); if (geometrySemantic != GeometrySemantic.None) { builtin = new ShaderBuiltin(geometrySemantic); } } else { builtin = new ShaderBuiltin(semanticType); } } } else if (typeInfo.Type.GetAttributes().Any(a => a.AttributeClass.Name.Contains("Semantic"))) { kind = ShaderResourceKind.BuiltIn; } } if (kind == ShaderResourceKind.StructuredBuffer || kind == ShaderResourceKind.RWStructuredBuffer || kind == ShaderResourceKind.RWTexture2D || valueType.Name.Contains(nameof(UniformBuffer <int>))) { valueType = ParseElementType(vds); } if (node.Parent is FieldDeclarationSyntax) { var arraySize = node.Parent.DescendantNodes().OfType <AttributeSyntax>().FirstOrDefault( attrSyntax => attrSyntax.Name.ToString().EndsWith("ArraySize")); if (arraySize != null) { var fixedSize = (int)GetModel(node).GetConstantValue(arraySize.ArgumentList.Arguments.First().Expression).Value; valueType = new TypeReference(valueType.Name, valueType.TypeInfo, fixedSize); } var emitAttribute = node.Parent.DescendantNodes().OfType <AttributeSyntax>().FirstOrDefault( attrSyntax => attrSyntax.Name.ToString().EndsWith("EmitVertex")); if (emitAttribute != null) { kind = ShaderResourceKind.Emit; } } ResourceDefinition rd; if (kind == ShaderResourceKind.Local) { rd = new ResourceDefinition(resourceName, 0, 0, valueType, kind); } else { int set = 0; // Default value if not otherwise specified. if (GetResourceDecl(node, out AttributeSyntax resourceSetDecl)) { set = GetAttributeArgumentIntValue(resourceSetDecl, 0, GetModel(node)); } int resourceBinding = GetAndIncrementBinding(set); if (kind == ShaderResourceKind.Uniform) { ValidateUniformType(typeInfo); } rd = new ResourceDefinition(resourceName, set, resourceBinding, valueType, kind); } rd.Semantic = builtin.Semantic; foreach (LanguageBackend b in _backends) { b.AddResource(_shaderSet.Name, rd); } }
protected virtual string SemanticIdentifier(ShaderBuiltin builtin) { return(null); }