Main loop: MainLoop (Part 14 of 15)

       Name: MainLoop (Part 14 of 15)                                [Show more]
       Type: Subroutine
   Category: Main loop
    Summary: Handle the score display
  Deep dive: Program flow of the main game loop
    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file


 LDA scoreDisplayTimer  \ If scoreDisplayTimer = 0, jump to main22 to skip the
 BEQ main22             \ following three instructions, as we are not currently
                        \ displaying the score

 CMP #220               \ If scoreDisplayTimer <> 220, jump down to main23 to
 BNE main23             \ decrement the timer and keep displaying the score

 BEQ main24             \ If scoreDisplayTimer = 220, it's time to remove the
                        \ score from the screen, so jump down to main24

.main22

 LDX #&C8               \ Scan the keyboard to see if "P" is being pressed
 JSR ScanKeyboard

 BNE main25             \ If "P" is not being pressed, jump to main25 to
                        \ continue with the main loop

.main23

                        \ If we get here then either we just pressed "P" or the
                        \ score is already being displayed, so in either case we
                        \ should update the timer and display the score

 DEC scoreDisplayTimer  \ Decrement the score timer

 JSR DisplayScore       \ Display the score, so we show it for the first time if
                        \ we just pressed "P", or update it if it changes while
                        \ being displayed

 JMP main25             \ Jump down to main25 to continue with the main loop

.main24

 JSR RemoveScore        \ Remove the score from the screen

 LDA #0                 \ Set scoreDisplayTimer = 0 as we are no longer showing
 STA scoreDisplayTimer  \ the score on-screen