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⌂ ∞ Elite on the BBC Micro and NES

Drawing sprites: HideMostSprites

[NES version, Bank 7]

       Name: HideMostSprites                                         [Show more]
       Type: Subroutine
   Category: Drawing sprites
    Summary: Hide all sprites except for sprite 0 and the icon bar pointer

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DEATH calls HideMostSprites
             * DrawTitleScreen calls HideMostSprites
             * LAUN calls HideMostSprites
             * SetScreenForUpdate calls HideMostSprites




.HideMostSprites

 SETUP_PPU_FOR_ICON_BAR ; If the PPU has started drawing the icon bar, configure
                        ; the PPU to use nametable 0 and pattern table 0

 LDX #58                ; Set X = 58 so we hide 59 sprites

 LDY #20                ; Set Y so we start hiding from sprite 20 / 4 = 5

 BNE HideMoreSprites    ; Jump to HideMoreSprites to hide 59 sprites from
                        ; sprite 5 onwards (i.e. sprites 5 to 63, which only
                        ; leaves sprite 0 and the icon bar pointer sprites 1 to
                        ; 4)
                        ;
                        ; We return from the subroutine using a tail call (this
                        ; BNE is effectively a JMP as Y is never zero)