feat(main.cpp): rework main file

src/main.cpp

@@ -1,66 +1,79 @@
+#include <cstddef>
+#include <cstdlib>
+#include <iostream>
+
 #include "glad/glad.h"
 #include "GLFW/glfw3.h"
-
+// #include "imgui.h"
-#include <cstdio>
+// #include "backends/imgui_impl_glfw.h"
-// #include <cstdlib>
+// #include "backends/imgui_impl_opengl3.h"
-#include <iostream>
-#include <ostream>
 
 #include "camera.hpp"
 #include "cube.hpp"
-#include "glm/ext/vector_float3.hpp"
 
-static void glfwErrorCallback(int error, const char *description)
+constexpr const char *WINDOW_NAME = "window";
+
+int width = 800;
+int height = 600;
+
+int main(void)
 {
-  std::cerr << "GLFW Error " << error << ": " << description << std::endl;
+  // define error callback
-}
+  glfwSetErrorCallback(
-
+      [](int error, const char *desc)
-int main()
+      { std::cerr << "GLFW ERROR (" << error << "): " << desc << std::endl; });
-{
-    const char *title = "window";
-    int width = 800, height = 600;
-
-    glfwSetErrorCallback(glfwErrorCallback);
 
   if (glfwInit() == GLFW_FALSE)
   {
-      std::cerr << "ERROR(GLFW): initialisation error" << std::endl;
+    std::cerr << "GLFW ERROR: Failed to initialize glfw." << std::endl;
-      exit(EXIT_FAILURE);
+    return EXIT_FAILURE;
   }
 
-    // OpenGL 3.3
+  // OpenGL CORE 4.1
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);
   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-    glfwWindowHint(GLFW_DEPTH_BITS, 24);
+  // window properties
-    glfwWindowHint(GLFW_STENCIL_BITS, 8);
+  glfwWindowHint(GLFW_DEPTH_BITS, 24);   // set depth buffer to 3 bytes  (24 bits)
-    glfwWindowHint(GLFW_SAMPLES, 4);
+  glfwWindowHint(GLFW_STENCIL_BITS, 8);  // set stencil buffer to 1 byte (8 bits)
+  glfwWindowHint(GLFW_SAMPLES, 4);       // activate MSAA (4 samples per pixels)
 #ifdef __APPLE__
-    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+  glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT,
+                 GL_TRUE);               // disable deprecated functionalities
 #endif
 
-    GLFWwindow *window = glfwCreateWindow(width, height, title, nullptr,
+  GLFWwindow *window =
-    nullptr); if (window == nullptr)
+      glfwCreateWindow(width, height, WINDOW_NAME, nullptr, nullptr);
+
+  if (window == NULL)
   {
-      std::cerr
+    std::cerr << "GLFW ERROR: Failed to create GLFW window." << std::endl;
-          << "ERROR: Failed to create GLFW window with requested GL version."
-          << std::endl;
     glfwTerminate();
-      exit(EXIT_FAILURE);
+    return EXIT_FAILURE;
   }
 
   glfwMakeContextCurrent(window);
 
   if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
   {
-      std::cerr << "ERROR: Failed to initialize GLAD" << std::endl;
+    std::cerr << "GLAD ERROR: Failed to initialize GLAD" << std::endl;
     glfwDestroyWindow(window);
     glfwTerminate();
-      exit(EXIT_FAILURE);
+    return EXIT_FAILURE;
   }
 
   glfwSwapInterval(1);
 
+  // IMGUI_CHECKVERSION();
+  // ImGui::CreateContext();
+  // ImGuiIO &io = ImGui::GetIO();
+  // (void)io;
+
+  // ImGui::StyleColorsDark();
+
+  // ImGui_ImplGlfw_InitForOpenGL(window, true);
+  // ImGui_ImplOpenGL3_Init("#version 410");
+
   Camera camera(width, height, window, 0.1f);
   Cube cube{camera, glm::vec3{0.f, 0.f, 0.f}, "stone.png"};
 
@@ -97,5 +110,5 @@ int main()
 
   glfwDestroyWindow(window);
   glfwTerminate();
-  return 0;
+  return EXIT_SUCCESS;
 }