Simple OpenGL program to open window.

main.c

#include <stdio.h>
#include <stdlib.h>

#include <GL/glew.h>
#include <GLFW/glfw3.h>

int
main()
{
  // Initialise GLFW
  glewExperimental = 0x1; // Needed for core profile
  if (!glfwInit()) {
    fprintf(stderr, "Failed to initialize GLFW\n");
    return -1;
  }

  glfwWindowHint(GLFW_SAMPLES, 4);               // 4x antialiasing
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3); // We want OpenGL 3.3
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT,
                 GL_TRUE); // To make MacOS happy; should not be needed
  glfwWindowHint(GLFW_OPENGL_PROFILE,
                 GLFW_OPENGL_CORE_PROFILE); // We don't want the old OpenGL

  // Open a window and create its OpenGL context
  GLFWwindow* window; // (In the accompanying source code, this variable is
                      // global for simplicity)
  window = glfwCreateWindow(1024, 768, "Tutorial 01", NULL, NULL);
  if (window == NULL) {
    fprintf(stderr,
            "Failed to open GLFW window. If you have an Intel GPU, they are "
            "not 3.3 compatible. Try the 2.1 version of the tutorials.\n");
    glfwTerminate();
    return -1;
  }
  glfwMakeContextCurrent(window); // Initialize GLEW
  glewExperimental = 0x1;         // Needed in core profile
  if (glewInit() != GLEW_OK) {
    fprintf(stderr, "Failed to initialize GLEW\n");
    return -1;
  }

  // Ensure we can capture the escape key being pressed below
  glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_TRUE);

  do {
    // Clear the screen. It's not mentioned before Tutorial 02, but it can cause
    // flickering, so it's there nonetheless.
    glClear(GL_COLOR_BUFFER_BIT);

    // Draw nothing, see you in tutorial 2 !

    // Swap buffers
    glfwSwapBuffers(window);
    glfwPollEvents();

  } // Check if the ESC key was pressed or the window was closed
  while (glfwGetKey(window, GLFW_KEY_ESCAPE) != GLFW_PRESS &&
         glfwWindowShouldClose(window) == 0);
}