Drivers: SwapDriverPosition

       Name: SwapDriverPosition                                      [Show more]
       Type: Subroutine
   Category: Drivers
    Summary: Swap the position for two drivers (i.e. overtake)
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * ProcessOvertaking (Part 1 of 3) calls SwapDriverPosition
             * ResetVariables calls SwapDriverPosition


 Arguments:

   X                    The first position

   Y                    The second position


 Returns:

   X                    The number of the driver now at position X

   Y                    The number of the driver now at position Y


.SwapDriverPosition

 LDA driversInOrder,X   \ Set T to the number of the driver at position X
 STA T

 LDA driversInOrder,Y   \ Set A to the number of the driver at position Y

 STA driversInOrder,X   \ Set the driver at position X to the driver from
                        \ position Y

 TAX                    \ Set X to the number of the driver now at position X

 LDA T                  \ Set the driver at position y to the driver from
 STA driversInOrder,Y   \ position X

 TAY                    \ Set Y to the number of the driver now at position Y

 RTS                    \ Return from the subroutine