type.hpp

/*
 * glslstruct - a C++ library designed to easily represent GLSL's Uniform Buffer Objects (UBOs) and Shader Storage Buffer Objects (SSBOs) in C++.
 *
 * Licensed under the BSD 3-Clause License with Attribution Requirement.
 * See the LICENSE file for details: https://github.com/MAIPA01/glslstruct/blob/main/LICENSE
 *
 * Copyright (c) 2025, Patryk Antosik (MAIPA01)
 */
 
#pragma once
#ifndef _GLSL_STRUCT_GLSL_TYPE_HPP_
    #define _GLSL_STRUCT_GLSL_TYPE_HPP_
 
    #include <glslstruct/config.hpp>
 
    #if !_GLSL_STRUCT_HAS_TYPES
_GLSL_STRUCT_ERROR(
  "This is only available for c++17 and greater and when types are not disabled with defined GLSL_STRUCT_DISABLE_TYPES!"
);
    #else
 
        #include <glslstruct/type/containers/base_type.hpp>
        #include <glslstruct/type/visitors/eq_type_visitor.hpp>
 
namespace glslstruct {
    /**
     * @brief intermediate glsl type containers
     * @ingroup glsl_types
     * @tparam Derived derived type
     */
    template<class Derived>
    class _GLSL_STRUCT_EXPORT type : public base_type {
    private:
        /// @brief standard cast from this to derived type
        _GLSL_STRUCT_CONSTEXPR17 const Derived& _get_derived() const noexcept { return *static_cast<const Derived*>(this); }
 
    protected:
        /// @brief accept function overload
        void _accept(const mstd::function_view<void(const scalar_type&)> scalarVisit,
          const mstd::function_view<void(const vec_type&)> vecVisit, const mstd::function_view<void(const mat_type&)> matVisit,
          const mstd::function_view<void(const struct_type&)> structVisit,
          const mstd::function_view<void(const array_type&)> arrayVisit) const override {
                if _MSTD_CONSTEXPR17 (std::is_same_v<Derived, scalar_type>) { scalarVisit(_get_derived()); }
                else if _MSTD_CONSTEXPR17 (std::is_same_v<Derived, vec_type>) { vecVisit(_get_derived()); }
                else if _MSTD_CONSTEXPR17 (std::is_same_v<Derived, mat_type>) { matVisit(_get_derived()); }
                else if _MSTD_CONSTEXPR17 (std::is_same_v<Derived, struct_type>) { structVisit(_get_derived()); }
                else if _MSTD_CONSTEXPR17 (std::is_same_v<Derived, array_type>) { arrayVisit(_get_derived()); }
        }
 
    public:
        using base_type::operator!=;
 
        /// @brief constructor with type size
        explicit _GLSL_STRUCT_CONSTEXPR20 type(const size_t size) noexcept : base_type(size) {}
 
        /// @brief default copy constructor
        _GLSL_STRUCT_CONSTEXPR20 type(const type& other) noexcept            = default;
        /// @brief default move constructor
        _GLSL_STRUCT_CONSTEXPR20 type(type&& other) noexcept                 = default;
        /// @brief default destructor
        virtual _GLSL_STRUCT_CONSTEXPR20 ~type() noexcept override           = default;
 
        /// @brief default copy assign operator
        _GLSL_STRUCT_CONSTEXPR17 type& operator=(const type& other) noexcept = default;
        /// @brief default move assign operator
        _GLSL_STRUCT_CONSTEXPR17 type& operator=(type&& other) noexcept      = default;
 
        /// @brief accept function for type visitors
        #if _GLSL_STRUCT_HAS_CXX20
        template<type_visitor T>
        #else
        template<class T, std::enable_if_t<is_type_visitor_v<T>, bool> = true>
        #endif
        void accept(T& visitor) const {
            visitor.visit(_get_derived());
        }
 
        /// @brief equal operator
        [[nodiscard]] bool operator==(const base_type& other) const noexcept override {
                if (!base_type::operator==(other)) { return false; }
 
            eq_type_visitor<Derived> visitor(&_get_derived());
            other.accept(visitor);
            return visitor.result();
        }
 
        template<class DerivedA, class DerivedB>
        friend _GLSL_STRUCT_CONSTEXPR17 bool operator==(const type<DerivedA>& lhs, const type<DerivedB>& rhs) noexcept;
        template<class DerivedA, class DerivedB>
        friend _GLSL_STRUCT_CONSTEXPR17 bool operator!=(const type<DerivedA>& lhs, const type<DerivedB>& rhs) noexcept;
    };
 
    /**
     * @brief equal operator for two intermediate types
     * @ingroup glsl_types
     */
    template<class DerivedA, class DerivedB>
    [[nodiscard]] _GLSL_STRUCT_EXPORT _GLSL_STRUCT_CONSTEXPR17 bool operator==(const type<DerivedA>& lhs,
      const type<DerivedB>& rhs) noexcept {
            if _GLSL_STRUCT_CONSTEXPR17 (std::is_same_v<DerivedA, DerivedB>) { return lhs._get_derived() == rhs._get_derived(); }
            else { return false; }
    }
 
    /**
     * @brief not equal operator for two intermediate types
     * @ingroup glsl_types
     */
    template<class DerivedA, class DerivedB>
    [[nodiscard]] _GLSL_STRUCT_EXPORT _GLSL_STRUCT_CONSTEXPR17 bool operator!=(const type<DerivedA>& lhs,
      const type<DerivedB>& rhs) noexcept {
        return !(lhs == rhs);
    }
} // namespace glslstruct
    #endif
#endif