void cmdCB(OGLCONSOLE_Console console, char *cmd)
{
    if (!strncmp(cmd, "quit", 4)) done = TRUE;

    else if (!strncmp(cmd, "add", 3))
    {
        int a, b;
        if (sscanf(cmd, "add %i %i", &a, &b) == 2)
        {
            OGLCONSOLE_Output(console, "%i + %i = %i", a, b, a+b);
            return;
        }

        OGLCONSOLE_Output(console, "usage: add INT INT");
        return;
    }

    OGLCONSOLE_Output(console, "I don't understand this command: %s", cmd);
}