private float[] getMVPMatrix(){
        float[] mMVPMatrix = new float[16];
        float[] mRotationMatrix = new float[16];
        float[] mViewMatrix = getDefaultViewMatrix();

        long time = SystemClock.uptimeMillis();
        float angle =  0.001f*((float) time);

        Matrix.setRotateM(mRotationMatrix, 0, angle, 0, 0, -1.0f);

        Matrix.multiplyMM(mViewMatrix, 0, mRotationMatrix, 0, mViewMatrix, 0);
        Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mViewMatrix, 0);


        return mMVPMatrix;
    }