inverted origin by DELTRON

1

glMatrixMode(GL_PROJECTION);     glLoadIdentity();     gluOrtho2D(0, WINDOW_X, 0, WINDOW_Y);     // invert the y axis so that down is positive     glScalef(1, -1, 1);     // origin will be upper left     glTranslatef(0, -WINDOW_Y, 0);     glMatrixMode(GL_MODELVIEW);     glLoadIdentity();