Mozny zpusob prepinani se mezi 2D a 3D zobrazenim. Vyuziti pro GUI?

2to3to2.h

public static void switchTo2D() {
    if (currentRenderDimension != Dimension.DIM_2) {
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        glEnable(GL_BLEND);
        glDisable(GL_CULL_FACE);
        glDisable(GL_DEPTH_TEST);

        glMatrixMode(GL_MODELVIEW);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(0, Display.getWidth(), Display.getHeight(), 0);
        glViewport(0, 0, Display.getWidth(), Display.getHeight());
        glMatrixMode(GL_MODELVIEW);

        glPushMatrix();
        glLoadIdentity();

        currentRenderDimension = Dimension.DIM_2;
    }
}

public static void switchTo3D() {

    if (currentRenderDimension != Dimension.DIM_3) {
        glCullFace(GL_BACK);
        glEnable(GL_CULL_FACE);
        glEnable(GL_DEPTH_TEST);
        glDisable(GL_BLEND);

        glPopMatrix(); //From 2D
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(PreferenceHelper.getInteger("fieldOfView"), (float) Display.getWidth() / Display.getHeight(), 0.1f, 1000);
        glViewport(0, 0, Display.getWidth(), Display.getHeight());
        glMatrixMode(GL_MODELVIEW);

        currentRenderDimension = Dimension.DIM_3;
    }
}