Main loop: Main game loop (Part 2 of 6)

       Name: Main game loop (Part 2 of 6)                            [Show more]
       Type: Subroutine
   Category: Main loop
    Summary: Update the main loop counters
  Deep dive: Program flow of the main game loop
             Ship data blocks
             Fixing ship positions
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * Main game loop (Part 6 of 6) calls via TT100
             * me2 calls via me3


 This section covers the following:

   * Update the main loop counters


 Other entry points:

   TT100                The entry point for the start of the main game loop,
                        which calls the main flight loop and the moves into the
                        spawning routine

   me3                  Used by me2 to jump back into the main game loop after
                        printing an in-flight message


.TT100

 DEC DLY                \ Decrement the delay counter in DLY, so any in-flight
                        \ messages get removed once the counter reaches zero

 BEQ me2                \ If DLY is now 0, jump to me2 to remove any in-flight
                        \ message from the space view, and once done, return to
                        \ me3 below, skipping the following two instructions

 BPL me3                \ If DLY is positive, jump to me3 to skip the next
                        \ instruction

 INC DLY                \ If we get here, DLY is negative, so we have gone too
                        \ and need to increment DLY back to 0

.me3

 DEC MCNT               \ Decrement the main loop counter in MCNT