/*
    Hello World - affichage d'un rectangle avec GLFW

    CC BY-SA Edouard.Thiel@univ-amu.fr - 24/12/2024
*/

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


void displayGL (GLFWwindow* window)
{
    std::cout << __func__ << std::endl;

    glClear (GL_COLOR_BUFFER_BIT);

    glRectd (-0.5, -0.5, 0.5, 0.5);
}


void error_callback (int error, const char* description)
{
    std::cerr << "Error: " << description << std::endl;
}


int main() 
{
    if (!glfwInit()) {
        std::cerr << "GLFW: initialization failed" << std::endl;
        exit (1);
    }
    glfwSetErrorCallback (error_callback);

    GLFWwindow* window = glfwCreateWindow (640, 480, "Hello World!", NULL, NULL);
    if (!window) {
        std::cerr << "GLFW: window creation failed" << std::endl;
        glfwTerminate();
        exit (1);
    }
    glfwMakeContextCurrent (window);

    while (!glfwWindowShouldClose (window))
    {
        displayGL (window);
        glfwSwapBuffers (window);
        glfwWaitEvents();
    }

    glfwDestroyWindow (window);
    glfwTerminate();
}