Shader: Fix struct nesting

src/Nazara/Shader/Ast/TransformVisitor.cpp

@@ -127,6 +127,9 @@ namespace Nz::ShaderAst
 
 	void TransformVisitor::Visit(DeclareStructStatement& node)
 	{
+		for (auto& member : node.description.members)
+			member.type = ResolveType(member.type);
+
 		node.structIndex = RegisterStruct(node.description.name, node.description);
 
 		AstCloner::Visit(node);

src/Nazara/Shader/ShaderAstValidator.cpp

@@ -589,7 +589,15 @@ namespace Nz::ShaderAst
 	{
 		assert(m_context);
 
-		//TODO: check members attributes
+		std::unordered_set<std::string> declaredMembers;
+
+		for (auto& member : node.description.members)
+		{
+			if (declaredMembers.find(member.name) != declaredMembers.end())
+				throw AstError{ "struct member " + member.name + " found multiple time" };
+
+			declaredMembers.insert(member.name);
+		}
 
 		AstScopedVisitor::Visit(node);
 	}