Render GLUT

gistfile1.cpp

int SIZE = 1;
bool UP; 

void Render() {        
  // Clean up the colour of the window and the depth buffer
  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);  
  
  glMatrixMode(GL_MODELVIEW); 
  glLoadIdentity();
  
  // Set random colour on resize orange
  glColor3f(GenerateRandomColor(), GenerateRandomColor(), GenerateRandomColor());    
  
  // Draw a built-in primitive
  // If the mutex UP is true we add 1 to the size, and if it is false we subtract.
  // The range goes from 1 to 20.
  if (SIZE == 20){ UP = false; }
  if (SIZE == 1){ UP = true; }
  if (UP) {SIZE += 1;} else { SIZE -= 1; }
  glutSolidTeapot(SIZE);
  
  // All drawing commands applied to the hidden buffer, so now, bring forward 
  // the hidden buffer and hide the visible one
  glutSwapBuffers();    
}