A Paste by XP

void Test() {         GLint   viewport[4];         glGetIntegerv(GL_VIEWPORT, viewport);         glMatrixMode(GL_PROJECTION);         glPushMatrix();         glLoadIdentity();         gluOrtho2D(viewport[0],viewport[2],viewport[1],viewport[3]);         glColor3f(1,1,0);         glBegin(GL_QUADS);         glVertex2f(10+0, 10+0 );         glVertex2f(10+0, 10+5 );         glVertex2f(10+5, 10+5 );         glVertex2f(10+5, 10+0 );         glEnd();         glPopMatrix();         return 0; }