macOS OpenGL hello world using GLFW

cyan window

What a beautiful cyan! I made this window on macOS using C, OpenGL and GLFW. Here’s the C:

// main.c
#include <GLFW/glfw3.h>
int main(void) {
  if (!glfwInit()) return -1;
  GLFWwindow* window = glfwCreateWindow(320, 240, "Hello World", NULL, NULL);
  if (!window) {
    return -1;
  glClearColor(0.0f, 1.0f, 1.0f, 1.0f);
  while (!glfwWindowShouldClose(window)) {
  return 0;

To compile it:

$ brew install glfw3
$ clang -lglfw -framework OpenGL main.c
$ ./a.out

GLFW is an abstraction over the different window systems of MacOS, Linux, Windows, etc. This C should also work on Windows or Linux, though the compilation steps may look different.

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I wrote this because I felt like it. This post is not associated with my employer. This site is hosted by Netlify (who are great, but I'm not associated with them either).