I’am currently learning OpenGL through the site https://learnopengl.com/ and i was trying to make a class for the texture, but it is giving an linking error that it does not main file.

This is the away that the code is working

Application.cpp

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

int main()
{
    // CODE

    // load and create a texture 
    // -------------------------
    unsigned int texture;
    // texture 
    // ---------
    glGenTextures(1, &texture);
    glBindTexture(GL_TEXTURE_2D, texture);

    // set the texture wrapping parameters
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    // set texture filtering parameters
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    // load image, create texture and generate mipmaps
    int width, height, nrChannels;
    stbi_set_flip_vertically_on_load(true); // tell stb_image.h to flip loaded texture's on the y-axis.
    unsigned char* data = stbi_load("resources/textures/container.jpg", &width, &height, &nrChannels, 0);
    if (data)
    {
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
        glGenerateMipmap(GL_TEXTURE_2D);
    }
    else
    {
        std::cout << "Failed to load texture" << std::endl;
    }
    stbi_image_free(data);

}

The problem is when i tried to implement this code in a separated class it gives a link error

Texture.h

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

class Texture
{
public:
    unsigned int ID{};

    Texture(const char* texPath);

private:

};

Texture.cpp

#include "Texture.h"

Texture::Texture(const char* texPath)
{
    // Create the texture in OpenGL
    glGenTextures(1, &ID);
    glBindTexture(GL_TEXTURE_2D, ID);

    // set the texture wrapping parameters
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    // set texture filtering parameters
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    // load image, create texture and generate mipmaps
    int width;
    int height;
    int nrChannels;

    unsigned char* data = stbi_load(texPath, &width, &height, &nrChannels, 0);
    if (data)
    {
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
        glGenerateMipmap(GL_TEXTURE_2D);
    }
    else
    {
        std::cout << "Failed to load texture" << std::endl;
    }
    stbi_image_free(data);
}

Application.cpp

#include "../Texture/Texture.h"

int main()
{
    // CODE
    Texture texture1{ "resources/textures/container.jpg" };
}

1>Texture.obj : error LNK2005: “Some function of the stb_image.h” already defined in Application.obj