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⌂ ∞ Elite on the BBC Micro and NES

Equipment: HighlightLaserView

[NES version, Bank 0]

       Name: HighlightLaserView                                      [Show more]
       Type: Subroutine
   Category: Equipment
    Summary: Highlight the laser view name in the popup menu

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




 Arguments:

   Y                    The number of the laser view:

                          * 0 = front
                          * 1 = rear
                          * 2 = left
                          * 3 = right



 Returns:

   Y                    Y is preserved



.HighlightLaserView

 LDA #2                 ; Set the font style to print in the highlight font
 STA fontStyle

 JSR PrintLaserView     ; Print the name of the laser view specified in Y at the
                        ; correct on-screen position for the popup menu

 LDA #1                 ; Set the font style to print in the normal font
 STA fontStyle

 TYA                    ; Store Y on the stack so we can retrieve it at the end
 PHA                    ; of the subroutine

 JSR DrawScreenInNMI    ; Configure the NMI handler to draw the screen, so the
                        ; screen gets updated

 JSR WaitForPPUToFinish ; Wait until both bitplanes of the screen have been
                        ; sent to the PPU, so the screen is fully updated and
                        ; there is no more data waiting to be sent to the PPU

 PLA                    ; Retrieve Y from the stack so it is unchanged by the
 TAY                    ; subroutine call

 RTS                    ; Return from the subroutine