1. Check previous article to install GLFW
2. Download Glad(https://glad.dav1d.de)
C/C++, OpenGL, gl(Version 3.3) --> Generate --> Download Zip file
3. File tree
├── glad.c
├── include/
│ ├── KHR/
│ │ └── khrplatform.h
│ └── glad/
│ └── glad.h
└── Hello_Window.cpp
4. Hello_World.cpp(A Sample code)
------------------------------------------------------------------------
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
void framebuffer_size_callback(GLFWwindow* window, int width, int height) {
glViewport(0, 0, width, height);
}
// Process escape key to close the window
void processInput(GLFWwindow *window) {
if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS) {
glfwSetWindowShouldClose(window, true);
}
}
int main() {
// 1. Initialize GLFW
if (!glfwInit()) {
std::cerr << "Failed to initialize GLFW" << std::endl;
return -1;
}
// 2. Configure GLFW (Targeting OpenGL 3.3 Core Profile)
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // Required for macOS
#endif
// 3. Create the window object
GLFWwindow* window = glfwCreateWindow(800, 600, "OpenGL Hello World", NULL, NULL);
if (window == NULL) {
std::cerr << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// 4. Initialize GLAD before calling any OpenGL functions
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
std::cerr << "Failed to initialize GLAD" << std::endl;
return -1;
}
// 5. The Render Loop
while (!glfwWindowShouldClose(window)) {
// Input handling
processInput(window);
// Rendering commands (Clear screen with a dark greenish-blue color)
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
// Swap buffers and poll window events
glfwSwapBuffers(window);
glfwPollEvents();
}
// 6. Clean up resources
glfwTerminate();
return 0;
}
------------------------------------------------------------------------
5. Build code
g++ Hello_World.cpp glad.c -I./include -lglfw -lGL -ldl -o Hello_Window
