Main loop: Main flight loop (Part 10 of 16)

       Name: Main flight loop (Part 10 of 16)                        [Show more]
       Type: Subroutine
   Category: Main loop
    Summary: For each nearby ship: Remove if scooped, or process collisions
  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


 The main flight loop covers most of the flight-specific aspects of Elite. This
 section covers the following:

   * Continue looping through all the ships in the local bubble, and for each
     one:

     * Remove scooped item after both successful and failed scooping attempts

     * Process collisions


 LDA auto               \ If the docking computer is on, then auto will be &FF,
 AND #%00000100         \ so this will set A = 1, a tiny amount of damage
 EOR #%00000101         \
                        \ If the docking computer is off, then auto will be 0,
                        \ so this will set A = 5, a small amount of damage

 BNE MA63               \ Jump to MA63 to process the damage in A (this BNE is
                        \ effectively a JMP as A will never be zero)

.MA58

                        \ If we get here, we have collided with something in a
                        \ potentially fatal way

 LDA #64                \ Call n_hit to apply a hit of strength 64 to the ship
 JSR n_hit              \ we just collided with

 JSR anger_8c           \ Call anger_8c to make the ship angry

.n_crunch

                        \ If we get here, we have collided with something, so we
                        \ need to take a hit to our shields

 LDA #128               \ Set A = 128 to indicate a fairly large amount of
                        \ damage

.MA63

 JSR OOPS               \ The amount of damage is in A, so call OOPS to reduce
                        \ our shields, and if the shields are gone, there's a
                        \ chance of cargo loss or even death

 JSR EXNO3              \ Make the sound of colliding with the other ship and
                        \ fall through into MA26 to try targeting a missile