File Parameters.h

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#pragma once

#include "glm/glm.hpp"

#include <string>
#include <unordered_map>
#include <variant>

enum ParaType
{
    NONE_PARA = -1, 

    FLOAT_PARA,   
    INT_PARA,     
    BOOL_PARA,    
    STRING_PARA,  
    VEC2_PARA,    
    VEC3_PARA,    
    VEC4_PARA,    

    MAT3_PARA,    
    MAT4_PARA,    
    TEXTURE_PARA, 
    CUSTOM_PARA   
};

class Parameters
{
public:

    Parameters();

    Parameters(ParaType _type, const std::string& _name = "unknown param");

    ~Parameters();

public:

    struct ParaData
    {
        ParaData() {}
        ~ParaData() {}
        std::variant<float, int, std::string, bool, glm::vec2, glm::vec3, glm::vec4> _data; 
        glm::vec2 data_range{ -10.0f, 10.0f }; 
    };

    bool is_para_changed;      
    std::string para_name;     
    ParaType para_type;        
    ParaData para_data;        

    template<typename T>
    T& Get();

public:

    Parameters GenParaItem(ParaType type);

    ParaData* GetParaPtr() { return &para_data; }

    void Rename(const std::string& name) { para_name = name; }
};

template<typename T>
T& Parameters::Get()
{
    if (!std::holds_alternative<T>(para_data._data)) {
        para_data._data = T(0);
        para_type = (ParaType)para_data._data.index();
    }

    return std::get<T>(para_data._data);
}