Hello world app using GLFW

hello_glfw.cpp

#include <glad\glad.h>
#include <GLFW\glfw3.h>

#include <iostream>

#define W 960
#define H 480
#define WINDOW_TITLE "Hello window"

void resize_framebuffer_cb(GLFWwindow *window, int w, int h);
void process_input(GLFWwindow *window);

int main(void)
{
  // configure window and context
	glfwInit();
	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
  
  // create window
	GLFWwindow *window = glfwCreateWindow(W, H, WINDOW_TITLE, NULL, NULL);
	if (window == NULL)
	{
		std::cout << "Window could not be created\n";
		glfwTerminate();
		return -1;
	}
	glfwMakeContextCurrent(window);
  
  // init glad for call opengl functions
	if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress))
	{
		std::cout << "Could not load GLAD\n";
		return -1;
	}

	// register glfw events
	glfwSetFramebufferSizeCallback(window, resize_framebuffer_cb);
  
  // ======================================================================
  
  // start viewport
	glViewport(0, 0, W, H);
	
	while (!glfwWindowShouldClose(window))
	{
		glClearColor(0.2, 0.5, 0.2, 1.0); // set the clear color
		glClear(GL_COLOR_BUFFER_BIT); // clear color buffer bitfield

		process_input(window);

		glfwSwapBuffers(window);
		glfwPollEvents();
	}
  
  return 0;
}

void resize_framebuffer_cb(GLFWwindow *window, int w, int h)
{
	glViewport(0, 0, w, h);
}

void process_input(GLFWwindow *window)
{
	if (glfwGetKey(window, GLFW_KEY_ESCAPE))
	{
		glfwSetWindowShouldClose(window, true);
	}
}