Drawing circles in OpenGL

I need to draw circles using OpenGL with Windows NT. The drawing routing should be very fast.
The frame-code is:

        glViewport(0, 0, w, h);
        glLoadIdentity();
        glOrtho(xmin, xmax, ymin, ymax, 1.0f, -1.0f);

        glInitNames();
        glPushName(1);


        glIndexi(0);
        glRectf( DirtyRect.GetX1(), DirtyRect.GetY1(), DirtyRect.GetX2(), DirtyRect.GetY2() );


        // 1. paint here something

        // 2. now paint a circle at, say (45.4 / -12.2  with radius 4.34)
        // BUT HOW ????



        glFlush();

Does anybody know a good algorithm or possibility in OpenGL ?
(P.S.: no solid circles needed).
LVL 9
PacmanAsked:
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RONSLOWCommented:
gluDisk

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RONSLOWCommented:
or gluCylinder

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RONSLOWCommented:
If you don't want to use these directly, then you can get the source code for either of these routines and see how they generate the coordinates for the circle

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PacmanAuthor Commented:
It works. Thank you.
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