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⌂ ∞ ▽ Elite on the 6502

Stardust: STARS

[NES version, Bank 1]

       Name: STARS                                                   [Show more]
       Type: Subroutine
   Category: Stardust
    Summary: The main routine for processing the stardust
  Deep dive: Sprite usage in NES Elite

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * STARS_b1 calls STARS




 Called at the very end of the main flight loop.



.STARS

 LDX VIEW               ; Load the current view into X:
                        ;
                        ;   0 = front
                        ;   1 = rear
                        ;   2 = left
                        ;   3 = right

 BEQ STARS1             ; If this 0, jump to STARS1 to process the stardust for
                        ; the front view

 DEX                    ; If this is view 2 or 3, jump to STARS2 (via ST11) to
 BNE ST11               ; process the stardust for the left or right views

 JMP STARS6             ; Otherwise this is the rear view, so jump to STARS6 to
                        ; process the stardust for the rear view

.ST11

 JMP STARS2             ; Jump to STARS2 for the left or right views, as it's
                        ; too far for the branch instruction above