Textures Class

// Texture.h
#pragma once

#include <stb_image.h>
#include <glad/glad.h>

#include <iostream>
#include <string>


class Texture
{
    unsigned int ID;
public:
	Texture(std::string path = "res/horse-face.png") {
        // load and create a texture 
        glGenTextures(1, &ID);
        glBindTexture(GL_TEXTURE_2D, ID);
        // set the texture wrapping parameters
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);	// set texture wrapping to GL_REPEAT (default wrapping method)
        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.
        // The FileSystem::getPath(...) is part of the GitHub repository so we can find files on any IDE/platform; replace it with your own image path.
        unsigned char* data = stbi_load(path.c_str(), &width, &height, &nrChannels, 0);
        if (data) {
            glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
            glGenerateMipmap(GL_TEXTURE_2D);
        }
        else {
            std::cout << "Failed to load texture" << std::endl;
        }
        stbi_image_free(data);

	}

    static void setActiveTexture(unsigned int glTexture) {
        glActiveTexture(glTexture);
    }

    void bind() {
        glBindTexture(GL_TEXTURE_2D, ID);
    }

};

// main.cpp
    // |>----------<>----------<>----------<>----------<>----------<|
    // |>                         TEXTURE                          <|
    // |>----------<>----------<>----------<>----------<>----------<|
    Texture horse("res/horse-face.png"), face("res/tears-of-joy.png");

    // default texture unit is 0 but we have minimum 16 unit for binding texture
    Texture::setActiveTexture(GL_TEXTURE0); 
    face.bind();

    shader.SetUniform1i("texture1", 0); 
    // GL_TEXTURE0 -> the unit 0 
    // GL_TEXTURE5 -> the unit 5 
// ...

// in main loop between ImGui::Begin and ImGui::End

        ImGui::Begin("test");
//...
        ImGui::Text(selected.c_str());

        if (ImGui::Button("face texture"))
            face.bind();
        if (ImGui::Button("horse texture"))
            horse.bind();


        ImGui::End();