first window

src/main.cpp

@@ -2,9 +2,61 @@
 #include <glad/glad.h> 
 #include <GLFW/glfw3.h>
 
-int main() {
-  std::cout << "Hello, world!\n";
+void framebuffer_size_callback(GLFWwindow* window, int width, int height);
+void processInput(GLFWwindow *window);
+
+int main()
+{
+  glfwInit();
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+  //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+
+  GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
+  if (window == NULL)
+  {
+    std::cout << "Failed to create GLFW window" << std::endl;
+    glfwTerminate();
+    return -1;
+  }
+  glfwMakeContextCurrent(window);
+
+  if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
+  {
+    std::cout << "Failed to initialize GLAD" << std::endl;
+    return -1;
+  }
+
+  glViewport(0, 0, 800, 600);
+
+  glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
+
+  while(!glfwWindowShouldClose(window))
+  {
+    processInput(window);
+
+    glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT);
+
+    glfwSwapBuffers(window);
+    glfwPollEvents();    
+  }
+
+  glfwTerminate();
 
   return 0;
 }
 
+void framebuffer_size_callback(GLFWwindow* window, int width, int height)
+{
+  glViewport(0, 0, width, height);
+}
+
+void processInput(GLFWwindow *window)
+{
+  if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+  {
+    glfwSetWindowShouldClose(window, true);
+  }
+}