61 lines
1.4 KiB
C++
61 lines
1.4 KiB
C++
// Copyright (C) 2021 Jérôme "Lynix" Leclercq (lynix680@gmail.com)
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// This file is part of the "Nazara Engine - Shader module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#pragma once
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#ifndef NAZARA_SHADER_AST_ATTRIBUTE_HPP
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#define NAZARA_SHADER_AST_ATTRIBUTE_HPP
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#include <Nazara/Prerequisites.hpp>
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#include <Nazara/Shader/Ast/Enums.hpp>
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#include <memory>
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#include <optional>
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#include <variant>
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namespace Nz::ShaderAst
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{
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struct Expression;
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using ExpressionPtr = std::unique_ptr<Expression>;
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template<typename T>
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class AttributeValue
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{
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public:
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AttributeValue() = default;
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AttributeValue(T value);
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AttributeValue(ExpressionPtr expr);
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AttributeValue(const AttributeValue&) = default;
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AttributeValue(AttributeValue&&) = default;
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~AttributeValue() = default;
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ExpressionPtr&& GetExpression() &&;
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const ExpressionPtr& GetExpression() const &;
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const T& GetResultingValue() const;
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bool IsExpression() const;
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bool IsResultingValue() const;
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bool HasValue() const;
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AttributeValue& operator=(const AttributeValue&) = default;
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AttributeValue& operator=(AttributeValue&&) = default;
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private:
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std::variant<std::monostate, T, ExpressionPtr> m_value;
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};
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struct Attribute
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{
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using Param = std::optional<ExpressionPtr>;
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AttributeType type;
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Param args;
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};
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}
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#include <Nazara/Shader/Ast/Attribute.inl>
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#endif // NAZARA_SHADER_AST_ATTRIBUTE_HPP
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