Visibility: ProcessLine (Part 4 of 7)

       Name: ProcessLine (Part 4 of 7)                               [Show more]
       Type: Subroutine
   Category: Visibility
    Summary: Process bullet lines
  Deep dive: Visibility checks
    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file


.plin6

                        \ If we get here then the point is not part of a linked
                        \ object, and object ID is in the range 12 to 15, so
                        \ this is a bullet line

 PLA                    \ Pull the point ID from the stack and store it in GG
 STA GG

 LDA objectStatus,Y     \ If bit 7 of the object's status byte is set, jump to
 BMI plin7              \ plin16 via plin7

                        \ If we get here then bit 7 of the object's status byte
                        \ is clear

 LDA #%10000000         \ Set showLine to say that the line is not in view
 STA showLine

 RTS                    \ Return from the subroutine

.plin7

 JMP plin16             \ Jump down to plin16 with the bullet point ID in GG, to
                        \ check distance and z-coordinates and return the final
                        \ result