OpenGL ES 3.0之顶点缓冲(2)

/////////////////////////////////////////////////////////////////
// Called when the view controller's view has been unloaded
// Perform clean-up that is possible when you know the view
// controller's view won't be asked to draw again soon.
- (void)viewDidUnload
{
  [super viewDidUnload];
 
  // Make the view's context current
  GLKView *view = (GLKView *)self.view;
  [EAGLContext setCurrentContext:view.context];
   
  // Delete buffers that aren't needed when view is unloaded
  if (0 != vertexBufferID)
  {
      glDeleteBuffers (1,          // STEP 7
                      &vertexBufferID); 
      vertexBufferID = 0;
  }
 
  // Stop using the context created in -viewDidLoad
  ((GLKView *)self.view).context = nil;
  [EAGLContext setCurrentContext:nil];
}

@end

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