73 lines
2.3 KiB
NASM
73 lines
2.3 KiB
NASM
;--------------------------------------------------------------------------------
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; $7F5010 - Scratch Space
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;--------------------------------------------------------------------------------
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DrawDungeonCompassCounts:
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SEP #$10
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LDX $1B : BNE + : RTL : + ; Skip if outdoors
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; extra hard safeties for getting dungeon ID to prevent crashes
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PHA
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LDA.w $040C : AND.w #$00FE : TAX ; force dungeon ID to be multiple of 2
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PLA
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CPX.b #$1B : BCC + ; Skip if not in a valid dungeon ID
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JMP .done
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+
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BIT.w #$0002 : BNE ++ ; if CompassMode==2, we don't check for the compass
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TXY : TXA : LSR : TAX : LDA.l ExistsTransfer, X : TAX : LDA CompassExists, X : BEQ ++
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TYX : LDA CompassField : AND.l DungeonItemMasks, X ; Load compass values to A, mask with dungeon item masks
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BNE ++
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JMP .done ; skip if we don't have compass
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++
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LDA $040C : LSR
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BNE +
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INC
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+ TAX : LDA.l CompassTotalsWRAM, X : AND #$00FF
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PHX
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PHA
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JSL HexToDec_fast
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PLA : CMP.w #100 : !BLT .two_digit
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LDX.b $05 : TXA : ORA #$2490 : STA $7EC79A
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LDX.b $06 : TXA : ORA #$2490 : STA $7EC79C
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LDX.b $07 : TXA : ORA #$2490 : STA $7EC79E
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BRA .end_total
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.two_digit
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LDX.b $06 : TXA : ORA #$2490 : STA $7EC79A
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LDX.b $07 : TXA : ORA #$2490 : STA $7EC79C
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.end_total
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PLX
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LDA DungeonLocationsChecked, X : AND #$00FF
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PHA
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JSL HexToDec_fast
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PLA : CMP.w #100 : !BLT +
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LDX.b $05 : TXA : ORA #$2490 : STA $7EC792 ; Draw the 100's digit
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+
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LDX.b $06 : TXA : ORA #$2490 : STA $7EC794 ; Draw the item count
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LDX.b $07 : TXA : ORA #$2490 : STA $7EC796
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LDA.w #$2830 : STA $7EC798 ; draw the slash
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.done
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RTL
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DungeonItemMasks: ; these are dungeon correlations to $7EF364 - $7EF369 so it knows where to store compasses, etc
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dw $8000, $4000, $2000, $1000, $0800, $0400, $0200, $0100
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dw $0080, $0040, $0020, $0010, $0008, $0004
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; maps from $040C to the odd order used in overworld map
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ExistsTransfer:
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db $0C, $0C, $00, $02, $0B, $09, $03, $07, $04, $08, $01, $06, $05, $0A
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;--------------------------------------------------------------------------------
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; $7EF4C0-7EF4CF - item locations checked indexed by $040C >> 1
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;--------------------------------------------------------------------------------
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InitCompassTotalsRAM:
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LDX #$00
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-
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LDA CompassTotalsROM, X : STA CompassTotalsWRAM, X
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INX
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CPX #$0F : !BLT -
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RTL
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