Example GLFW,C++,OpenGL,GLEW Program

Square.cpp

/******************************
 *
 * Example "Square"
 * created by Syd
 *
 *******************************/

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <cstdlib>
#include <iostream>

static int WIDTH = 640;
static int HEIGHT = 480;
double PI = 3.1415;
double trans = 0;
float rotatex = 0, rotatey = 0, mousex = 0, mousey = 0;
bool dragging = false;
int keyArr[350];

static void Initialize(void) {
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	glClearColor(0.0, 0.0, 0.0, 1.0);
}

static void Update(GLFWwindow* window, float delta) {
	std::cout << "delta:"<<delta<< std::endl;
	if (keyArr[GLFW_KEY_ESCAPE])
		glfwSetWindowShouldClose(window, 1);
	rotatex += keyArr[GLFW_KEY_LEFT] - keyArr[GLFW_KEY_RIGHT];
	rotatey += keyArr[GLFW_KEY_UP] - keyArr[GLFW_KEY_DOWN];
}

static void RenderScene(GLFWwindow* window, float delta) {
	glClear(GL_COLOR_BUFFER_BIT);
	glColor3f(1, 1, 1);

	glBegin(GL_LINE_LOOP);
	glVertex2f(0.25, 0.25);
	glVertex2f(0.75, 0.25);
	glVertex2f(0.75, 0.75);
	glVertex2f(0.25, 0.75);
	glEnd();
	glFlush();
}

static void Resize(GLFWwindow* window, int w, int h) {
    if (h < 1)
            h = 1;
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0f, (float) w / (float) h, 0.1f, 1000.0f);
    gluLookAt(0.0f, 0.0f, 30, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
    glMatrixMode( GL_MODELVIEW);
}

static void KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods) {
	keyArr[key] = action;
}

static void MouseClickCallback(GLFWwindow* window, int button, int action, int mods) {
	switch (button) {
	case GLFW_MOUSE_BUTTON_1:
		dragging = action;
		break;
	}
}

static void MouseMotionCallback(GLFWwindow* window, double x, double y) {
	if (dragging) {
		mousex += x;
		mousey += y;
	}
}

int main(int argc, char** argv) {
	GLFWwindow* window;

	glfwInit();
	window = glfwCreateWindow(WIDTH, HEIGHT, argv[0], NULL, NULL);
	glfwMakeContextCurrent(window);

	Initialize();

	glfwSetWindowSizeCallback(window, Resize);
	glfwSetKeyCallback(window, KeyCallback);
	glfwSetMouseButtonCallback(window, MouseClickCallback);
	glfwSetCursorPosCallback(window, MouseMotionCallback);
	while (!glfwWindowShouldClose(window)) {
		float delta = glfwGetTime();
		Update(window, delta);
		RenderScene(window, delta);
		glfwSetTime(0);
		glfwSwapBuffers(window);
		glfwPollEvents();
	}
	glfwDestroyWindow(window);
	return 0;
}

Where is glewInit()?

This was 8 years ago. It worked at that time. glewInit() wasn't neccessary for the example to run.

I would consider this deprecated and suggest you rather read into vulkan API now. ( I googled this real quick: https://github.com/raubee/Vulkan-Cube )

Oh, sorry, didn't notice timestamp. Thanks.