Is the following a valid drawing function?

void draw (void)

{

    glClear (GL_COLOR_BUFFER_BIT);

    glMatrixMode (GL_PROJECTION);

    glLoadIdentity ();

    glPushMatrix ();

    gluPerspective (45.0, (float)frame.size.width / (float)frame.size.height,

                    2.0, 1000.0);

    glMatrixMode (GL_MODELVIEW);

    glLoadIdentity ();

    glTranslatef (0, 0, -10);

    glColor3f (1.0, 1.0, 0.0);

    

    glBegin (GL_QUADS);

    glVertex2i (1, 0);

    glVertex2i (1, 1);

    glVertex2i (-1, 1);

    glVertex2i (-1, 0);

    glEnd ();

    glFlush ();

}

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