[Mesa3d-users] problem writing a mesa/X11 game

[Dave M. <mo...@ni...>]

Dave Morse writes:
 > I'm experiencing some bad behavior in a game I'm writing.  
 > 
 > My problem is that if Mesa draws my scene faster than 30 Hertz then I
 > never get any x events.  So as far as my client can tell, the mouse never
 > moves again.
 > 
 > All other applications recieve X events normally.
 > 
 > If I comment out the Mesa drawing code, then I get X events normally.
 > 
 > During the locked times, top reports that X is consuming 90% cpu time.
 > 
 > My machines are K6/450 and PII/333 running software mesa 3.3 beta.
 > 
 > Can someone explain why X is so studiously ignoring the event sending half
 > of its job, in favor of the rendering half?
 > 
 > Any ideas for a solution?

I should also mention that this is a second pass at implementing the
game.  The first pass was single-player, no network code, its main loop
looked like:

while (1) {
  check_x_events();
  update_game_state();
  draw_window();
}

The new version has a client and a server communicating through udp
packets, and the client loop looks like:

while (1) {
  select( ...X_Windows, UDP... ) /* block for any input */
  if (FD_ISSET( X_Windows ))
    {
      check_x_events();
      send_mouse_position_to_server();
    }
  if (FD_ISSET( UDP ));
    {
      read_game_state();
      draw_window();
    }
}

The simpler prototype loop had no problems getting X events.