Car geometry: HideAllCars

       Name: HideAllCars                                             [Show more]
       Type: Subroutine
   Category: Car geometry
    Summary: Set all the cars to hidden
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * FinishRace calls HideAllCars
             * MoveAndDrawCars calls HideAllCars


.HideAllCars

 LDX #22                \ We are about to process the car status bytes for
                        \ drivers 0 to 19, plus the three extra car objects in
                        \ 20 to 22 that make up the four-object car, so set a
                        \ loop counter in X

.hide1

 LDA objectStatus,X     \ Set bit 7 in the X-th byte of objectStatus to set the
 ORA #%10000000         \ car for driver X to be hidden
 STA objectStatus,X

 DEX                    \ Decrement the loop counter

 BPL hide1              \ Loop back until we have hidden all 23 cars

 RTS                    \ Return from the subroutine