iOS OpenGL ES 2 Creating Secondary Framebuffer

MyViewController.m

...MyDualFramebufferView _myView;

- (void)viewWillLayoutSubviews
{
	CGRect rc = self.view.bounds;

	GLfloat scale=1;
	if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)])
	{
		scale = [[UIScreen mainScreen] scale] ;
	}

	_myView->Resize (rc.size.width, rc.size.height, scale); // myView is anything you like


	[((GLKView *) self.view) bindDrawable]; // reset to main framebuffer because we changed it when we made a 2nd framebuffer
}