80 lines
2.0 KiB
NASM
80 lines
2.0 KiB
NASM
; =========================================================
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; Book of Secrets (Reveal Secrets with Book of Mudora)
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; Makes BG2 Disappear when holding L in a building
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; Based on the Parallel Worlds feature
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;
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; Layer Flags: xxxsabcd
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; (i count BG from 1 to 4 - MathOnNapkins RAM-Map counts from 0 to 3)
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; s - Sprite layer enabled
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; a - BG4 enabled
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; b - BG3 enabled
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; c - BG2 enabled
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; d - (BG1 disabled) --> only works if the room uses the feature "BG2 on Top"
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;
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; Originally by XaserLE, updated by scawful
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; LinkItem_Book
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; Desert Book activation trigger
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org $07A484 ; LDA $02ED : BNE BRANCH_BETA
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NOP #01
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JML LinkItem_BookOfSecrets
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return_pos:
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pullpc
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LinkItem_BookOfSecrets:
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{
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; set link in praying mode
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; LDA.b #$02 : STA.w $037A
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; LDA #$FF : STA $8C
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; LDA #$00 : STA $7EE00E
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; STZ $1D : STZ $9A
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; STZ.w $012D
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; Are we on the castle map?
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LDA $8A : CMP.b #$1B : BNE +
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; Is there an overlay playing?
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LDA $04C6 : BNE +
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; If not, start the castle entrance animation
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LDA.b #$02 : STA.w $04C6 ; Set the overlay
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STZ.b $B0 : STZ.b $C8
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; Cache the camera
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REP #$20
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LDA.w $0618 : STA.w CameraCache
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SEP #$20
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+
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JML $07A493 ; return do not !
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}
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Dungeon_RevealSecrets:
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{
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; Check if we are in a building
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LDA $1B : AND #$01 : BEQ .end
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; ----------
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; Check if we have the book of secrets
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LDA $7EF34D : CMP #$01 : BNE $0F ; if not, go to enable BG2
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; load unfiltered joypad 1 register (AXLR|????)
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; delete all bits except those for L
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LDA $F2 : AND #$20
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; L button pressed? (if yes, zero flag is set)
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SEC : SBC #$20 : BNE $06 ; if not, go to enable BG2
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; load layer flags and disable BG2 (0xFD = 11111101)
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LDA $1C : AND #$FD : BRA $04 ; go to store layer flags
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; enable BG2 (0x02 = 00000010)
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LDA $1C : ORA #$02 : STA $1C
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; ----------
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.end
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; @ $068365, JSL $099F91 old hook
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RTL
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}
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print "End of Items/book_of_secrets.asm ", pc
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pushpc
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