text: #pragma clang diagnostic ignored "-Wdeprecated-declarations"
  
  #include <GL\glew.h>
  #include <GL\freeglut.h>
  
  void draw() {
  	glClearColor(0.0, 0.0, 0.0, 0.0);  	
    	glClear(GL_COLOR_BUFFER_BIT);	
     
     	glLoadIdentity();
  	glColor3f(1.0, 1.0, 1.0);			
      glOrtho(0.0, 4.0, 0.0, 4.0, -1.0, 1.0);	 
      
    	GLint v1[] = {1,1};
      GLint v2[] = {3,2};
      
      glRectiv(v1,v2);
  
  
      glFlush();
      
  }
  
  int main(int argc, char** argv) {
      glutInit(&argc, argv);				// chiamate glut per la gestione delle finestre
      glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA);
      glutCreateWindow("openGL");
      glutDisplayFunc(draw);
      glutMainLoop();
  }
  
  