glPushMatrix();

                    glEnable(GL_BLEND);

                    glDisable(GL_TEXTURE_2D);
                    glDisable(GL_DEPTH_TEST);

                    glEnable(GL_MULTISAMPLE);
                    glDepthMask(false);

                    glLineWidth(1.8F);
                    glEnable(GL_LINE_SMOOTH);
                    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

                    glColor3d(255, 255, 255);

                    glBegin(GL_LINES);
                    glVertex3f(1, 0, 0);
                    glVertex3f(1, -1, 0);
 
                    glVertex3f(0, 0, 0);
                    glVertex3f(1, 0, 0);
 
                    glVertex3f(0, 0, 0);
                    glVertex3f(0, -1, 0);
 
                    glVertex3f(0, -1, 0);
                    glVertex3f(1, -1, 0);
 
                    glVertex3f(1, -1, 0);
                    glVertex3f(1, -1, -1);
 
                    glVertex3f(1, -1, -1);
                    glVertex3f(1, 0, -1);
 
                    glVertex3f(1, -1, -1);
                    glVertex3f(0, -1, -1);
 
                    glVertex3f(0, -1, -1);
                    glVertex3f(0, -1, 0);
 
                    glVertex3f(0, -1, -1);
                    glVertex3f(0, 0, -1);
 
                    glVertex3f(0, 0, -1);
                    glVertex3f(1, 0, -1);
 
                    glVertex3f(0, 0, -1);
                    glVertex3f(0, 0, 0);
 
                    glVertex3f(1, 0, -1);
                    glVertex3f(1, 0, 0);
 
                    glEnd();

                    glDisable(GL_BLEND);

                    glEnable(GL_TEXTURE_2D);
                    glEnable(GL_DEPTH_TEST);

                    glDisable(GL_MULTISAMPLE);
                    glDepthMask(true);

                    glDisable(GL_LINE_SMOOTH);

                    glPopMatrix();