void ImmediateModeRenderer10::begin (Matrix4& projModelView,int primitiveType) {
    GL10 * gl = gl10;
    gl->glMatrixMode(GL_PROJECTION);
    gl->glLoadMatrixf(projModelView.val);
    gl->glMatrixMode(GL_MODELVIEW);
    gl->glLoadIdentity();
    begin(primitiveType);
}