code: public void popTransform() {
  		if (stackIndex == 0) {
  			throw new RuntimeException("Attempt to pop a transform that hasn't be pushed");
  		}
  		
  		predraw();
  		
  		stackIndex--;
  		FloatBuffer oldBuffer = (FloatBuffer) stack.get(stackIndex);
  		GL.glLoadMatrix(oldBuffer);
  		sx = oldBuffer.get(16);
  		sy = oldBuffer.get(17);
  		
  		postdraw();
  	}
docs: Pop a previously pushed transform from the stack to the current. This should
  only be called if a transform has been previously pushed.