Shader: Add attribute parsing

include/Nazara/Shader/ShaderEnums.hpp

@@ -16,6 +16,12 @@ namespace Nz::ShaderAst
 		Simple //< =
 	};
 
+	enum class AttributeType
+	{
+		Entry, //< Entry point (function only) - has argument type
+		Layout //< Struct layout (struct only) - has argument style
+	};
+
 	enum class BasicType
 	{
 		Boolean,   //< bool

include/Nazara/Shader/ShaderLangParser.hpp

@@ -25,6 +25,12 @@ namespace Nz::ShaderLang
 		public:
 			using exception::exception;
 	};
+	
+	class UnknownAttribute : public std::exception
+	{
+		public:
+			using exception::exception;
+	};
 
 	class UnknownType : public std::exception
 	{
@@ -49,10 +55,13 @@ namespace Nz::ShaderLang
 		private:
 			// Flow control
 			const Token& Advance();
+			void Consume(std::size_t count = 1);
 			const Token& Expect(const Token& token, TokenType type);
 			const Token& Expect(TokenType type);
 			const Token& Peek(std::size_t advance = 0);
 
+			std::vector<ShaderAst::Attribute> ParseAttributes();
+
 			// Statements
 			std::vector<ShaderAst::StatementPtr> ParseFunctionBody();
 			ShaderAst::StatementPtr ParseFunctionDeclaration();
@@ -70,6 +79,7 @@ namespace Nz::ShaderLang
 			ShaderAst::ExpressionPtr ParseParenthesisExpression();
 			ShaderAst::ExpressionPtr ParsePrimaryExpression();
 
+			ShaderAst::AttributeType ParseIdentifierAsAttributeType();
 			const std::string& ParseIdentifierAsName();
 			ShaderAst::ShaderExpressionType ParseIdentifierAsType();
 
@@ -77,6 +87,7 @@ namespace Nz::ShaderLang
 
 			struct Context
 			{
+				std::vector<ShaderAst::Attribute> pendingAttributes;
 				std::unique_ptr<ShaderAst::MultiStatement> root;
 				std::size_t tokenCount;
 				std::size_t tokenIndex = 0;

include/Nazara/Shader/ShaderNodes.hpp

@@ -12,9 +12,9 @@
 #include <Nazara/Math/Vector3.hpp>
 #include <Nazara/Math/Vector4.hpp>
 #include <Nazara/Shader/Config.hpp>
+#include <Nazara/Shader/ShaderAstTypes.hpp>
 #include <Nazara/Shader/ShaderConstantValue.hpp>
 #include <Nazara/Shader/ShaderEnums.hpp>
-#include <Nazara/Shader/ShaderAstTypes.hpp>
 #include <array>
 #include <memory>
 #include <optional>
@@ -25,6 +25,12 @@ namespace Nz::ShaderAst
 	class AstExpressionVisitor;
 	class AstStatementVisitor;
 
+	struct Attribute
+	{
+		AttributeType type;
+		std::string args;
+	};
+
 	struct NAZARA_SHADER_API Node
 	{
 		Node() = default;