94 lines
2.4 KiB
NASM
94 lines
2.4 KiB
NASM
; =========================================================
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; Book of Secrets (Reveal Secrets with Book of Mudora)
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; Interacts with SpecialObject ID 0x32
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; Makes objects disappear when using the book
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org $07A45E
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EXIT_07A45E:
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org $07AA6C
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Link_PerformDesertPrayer:
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; Restored vanilla book of mudora code
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; TODO: Update to work with special object
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org $07A471
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LinkItem_Book:
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{
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BIT.b $3A : BVS .exit
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LDA.b $6C : BNE EXIT_07A45E
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JSR Link_CheckNewY_ButtonPress : BCC .exit
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LDA.b $3A : AND.b #$BF : STA.b $3A
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LDA.w $02ED : BNE .do_prayer
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LDA.b #$3C : JSR PlaySFX_Set2 ; SFX2.3C
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BRA .exit
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.do_prayer
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BRL Link_PerformDesertPrayer
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.exit
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RTS
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}
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warnpc $07A494
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; =========================================================
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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
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; - 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 properly if the room
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; uses the feature "BG2 on Top"
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;
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; Originally by XaserLE, updated by scawful
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; Note: No longer used as part of Book of Secrets globally
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; Likely will be reused for specific events where we can
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; ensure the BG2 will have something secret to show,
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; rather than allowing the ability to be used anywhere.
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; =========================================================
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; long subroutine that is executed every frame
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org $068365
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JSL LinkItem_SecretsBook ; hook JSL $099F91
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; =========================================================
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pullpc
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LinkItem_SecretsBook:
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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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; TODO: Add a new condition, such as a RoomTag check
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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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JSL $099F91 ; restore original code
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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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