beginNativePainting() with QPainter's shader (for transformation and opacity purpose)

[diro]

I created a object inherited from QGraphicsItem and reimplement the paint() function.
Inside the paint() function, I draw something by QPainter and call painter->beginNativePainting() to draw some elements with native openGL command.
It all works well, but when I rotate the object( object->rotate(45)), only the elements drawn by QPainter is rotated, the elements drawn by openGL command doesn't work.
It seems the QPainter use the shader to do those transformation(rotate), how can I apply the shader to my openGL elements?

Sample Code:

class MyItem:public QGraphicsItem
{
public:
	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
	{
		painter->drawText(0, 0, "123");
		painter->fillRect(0, 0, 128, 128, Qt::green);
		painter->beginNativePainting();
 
		glEnable(GL_SCISSOR_TEST);
		glScissor(0, 0, 64, 64);
 
		glClearColor(1, 0, 0, 1);
		glClear(GL_COLOR_BUFFER_BIT);
 
		glDisable(GL_SCISSOR_TEST);
 
		glEnd();
		painter->endNativePainting();
	}
	QRectF boundingRect(void) const
	{
		return QRectF(0, 0, 100, 100);
	}
};

class MyItem:public QGraphicsItem
{
public:
	void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
	{
		painter->drawText(0, 0, "123");
		painter->fillRect(0, 0, 128, 128, Qt::green);
		painter->beginNativePainting();

		glEnable(GL_SCISSOR_TEST);
		glScissor(0, 0, 64, 64);

		glClearColor(1, 0, 0, 1);
		glClear(GL_COLOR_BUFFER_BIT);

		glDisable(GL_SCISSOR_TEST);

		glEnd();
		painter->endNativePainting();
	}
	QRectF boundingRect(void) const
	{
		return QRectF(0, 0, 100, 100);
	}
};

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