test-example.cpp

#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>

void framebuffer_size_callback(GLFWwindow* window, int width, int height);

//test flow
//default height and width
const unsigned int SCR_WIDTH = 800;
const unsigned int SCR_HEIGHT = 600;

int main(){
    //initialising OpenGL with version OpenGL3.3 and Core profile
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    //Creating window object
    GLFWwindow* window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "Hello OpenGL", NULL, NULL);
    if(window == NULL){
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }
    //call window object
    glfwMakeContextCurrent(window);

    //initialise GLAD
    if(!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){
        std::cout << "Failed to initialize GLAD" << std::endl;
        return -1;
    }

    //the openGL rendering window
    glViewport(0, 0, 800, 600);

    //call framebuffer_size_callback whenver screen is resized
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

    //till stopped by the user
    while(!glfwWindowShouldClose(window)){
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    //clean GLFW resources
    glfwTerminate();

    return 0;

}

//framebuffer size callback function defination
void framebuffer_size_callback(GLFWwindow* window, int width, int height){
    glViewport(0, 0, width, height);
}