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⌂ ∞ ▽ Revs on the BBC Micro

Main loop: MainDrivingLoop (Part 4 of 5)

       Name: MainDrivingLoop (Part 4 of 5)                           [Show more]
       Type: Subroutine
   Category: Main loop
    Summary: Main driving loop: Leave the track
  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




.main9

                        \ If we get here then either:
                        \
                        \   * We have quit the race or lap by pressing SHIFT-f7
                        \     (in which case we jumped here from part 5)
                        \
                        \   * This is either an Amateur or a Professional race
                        \     and we crashed (in which case we fell through from
                        \     part 3)
                        \
                        \   * leaveTrackTimer = 1 (in which case we jumped here
                        \     from part 5 after the leave track timer ran down)
                        \
                        \ In all cases, we are done racing and need to leave
                        \ the track

 JSR FlushSoundBuffers  \ Flush all four sound channel buffers

 LDA qualifyingTime     \ If bit 7 of qualifyingTime is set then this is a
 BMI main8              \ practice lap (i.e. qualifyingTime = 255), so jump to
                        \ main1 via main8, so we start a new practice lap

 LDX #48                \ Blank out the first text line at the top of the screen
 JSR PrintSecondLineGap \ and print token 48 on the second line, to give:
                        \
                        \    "                                      "
                        \    "             PLEASE  WAIT             "

 JSR FinishRace         \ Continue running the race until all the non-player
                        \ drivers have finished and we have a result

 LDA configStop         \ If bit 7 of configStop is set then we must be pressing
 BMI main13             \ either SHIFT-f0 for a pit stop or SHIFT and right
                        \ arrow to restart the game, so jump to main13 to leave
                        \ the track

 LDA #%00100000         \ Set bit 5 of configStop to indicate that we have
 STA configStop         \ retired from the race (so we leave the track
                        \ permanently rather than just visiting the pits)

 BNE main13             \ Jump to main13 to leave the track (this BNE is
                        \ effectively a JMP as A is never zero)