Attract Mode Logic

The crash code is now complete, and it was more complex than I'd anticipated.

On the other hand, the logic to automatically control the player's car during Attract Mode is a lot simpler. The code can be quite basic, because the traffic in OutRun intelligently attempts to move out of your way. A simple detail most home conversions didn't pick up upon.

Here's a simplified pseudo-code conversion if you're interested:

AttractModeAI()
{
  // Check upcoming road segment for straight/curve.
  // Choose route from pre defined table at road split.
  AICheckRoad(); 
 
  // Set steering value based on upcoming road segment                  
  AISetSteering();  
  
  // If speed is below a certain amount, just accelerate
  if (car_speed < 0xFA)
  {
    accelerator = MAX_VALUE;
    return;
  }
  
  // If AI Traffic is close, set brake on
  if (traffic_close)
  {
    traffic_close = false;
    brake = 0xC0;
  }
  
  // If either wheel of the car is off-road
  else if (wheels_offroad)
  {
    brake = 0xC0;
  }
  
  // Upcoming road: Straight Road
  if (road_type == STRAIGHT)
  {
    curve_counter = 0;
  }
  
  // Upcoming road: Curved Road
  else
  {
    if (++curve_counter == 1)
    {
      // Set road curve value based on hard coded road data. 
      // High value = Sharper Bend
      road_curve_value = value - 1;
    }
    // toggle brake on bends. 
    // The brake flickers on/off in OutRun attract mode
    else if (road_curve_value != 0 && ((road_curve_value <= 0xA) 
            || (road_curve_value & 8)))
    {
      brake = 0xA0;
      road_curve_value--;
      return;
    }   
  }
  
  accelerator = MAX_VALUE;
  return;
}