449 lines
13 KiB
NASM
449 lines
13 KiB
NASM
WarpLeft:
|
|
lda.l DRMode : beq .end
|
|
JSR CheckIfCave : BCS .end
|
|
lda.b LinkPosY : ldx.b LinkQuadrantV
|
|
jsr CalcIndex
|
|
!ADD.b #$06 : ldy.b #$01 ; offsets in A, Y
|
|
jsr LoadRoomHorz
|
|
.end
|
|
jsr Cleanup
|
|
rtl
|
|
|
|
WarpRight:
|
|
lda.l DRMode : beq .end
|
|
JSR CheckIfCave : BCS .end
|
|
lda.b LinkPosY : ldx.b LinkQuadrantV
|
|
jsr CalcIndex
|
|
!ADD.b #$12 : ldy.b #$ff ; offsets in A, Y
|
|
jsr LoadRoomHorz
|
|
.end
|
|
jsr Cleanup
|
|
rtl
|
|
|
|
WarpUp:
|
|
lda.l DRMode : beq .end
|
|
JSR CheckIfCave : BCS .end
|
|
lda.b LinkPosX : ldx.b LinkQuadrantH
|
|
jsr CalcIndex
|
|
ldy.b #$02 ; offsets in A, Y
|
|
jsr LoadRoomVert
|
|
.end
|
|
jsr Cleanup
|
|
rtl
|
|
|
|
; Checks if $a0 is equal to <Room>. If it is, opens its stonewall if it's there
|
|
macro StonewallCheck(Room)
|
|
lda.b RoomIndex : cmp.b #<Room> : bne ?end
|
|
lda.l <Room>*2+$7ef000 : ora.b #$80 : sta.l <Room>*2+$7ef000
|
|
?end
|
|
endmacro
|
|
|
|
WarpDown:
|
|
lda.l DRMode : beq .end
|
|
JSR CheckIfCave : BCS .end
|
|
lda.b LinkPosX : ldx.b LinkQuadrantH
|
|
jsr CalcIndex
|
|
!ADD.b #$0c : ldy.b #$ff ; offsets in A, Y
|
|
jsr LoadRoomVert
|
|
%StonewallCheck($43)
|
|
.end
|
|
jsr Cleanup
|
|
rtl
|
|
|
|
; carry set = use link door like normal
|
|
; carry clear = we are in dr mode, never use linking doors
|
|
CheckLinkDoorR:
|
|
lda.l DRMode : bne +
|
|
lda.l $7ec004 : sta.b RoomIndex ; what we wrote over
|
|
sec : rtl
|
|
+ clc : rtl
|
|
|
|
CheckLinkDoorL:
|
|
lda.l DRMode : bne +
|
|
lda.l $7ec003 : sta.b RoomIndex ; what we wrote over
|
|
sec : rtl
|
|
+ clc : rtl
|
|
|
|
TrapDoorFixer:
|
|
lda.b $fe : and.w #$0038 : beq .end
|
|
xba : asl #2 : sta.b Scrap00
|
|
stz.w TrapDoorFlag : lda.w $068c : ora.b Scrap00 : sta.w $068c
|
|
.end
|
|
stz.b $fe ; clear our fe here because we don't need it anymore
|
|
rts
|
|
|
|
Cleanup:
|
|
lda.l DRFlags : and.b #$10 : beq +
|
|
stz.w LayerAdjustment
|
|
+ inc.b GameSubMode
|
|
lda.b $ef
|
|
rts
|
|
|
|
; carry set if cave, clear otherwise
|
|
CheckIfCave:
|
|
REP #$30
|
|
LDA.b PreviousRoom : CMP.w #$00E1 : BCS .invalid
|
|
SEP #$30 : CLC : RTS
|
|
.invalid
|
|
SEP #$30 : SEC : RTS
|
|
|
|
;A needs be to the low coordinate, x needs to be either 0 for left,upper or non-zero for right,down
|
|
; This sets A (00,02,04) and stores half that at $04 for later use, (src door)
|
|
CalcIndex: ; A->low byte of Link's Coord, X-> Link's quadrant, DoorOffset x 2 -> A, DoorOffset -> $04 (vert/horz agnostic)
|
|
cpx.b #00 : bne .largeDoor
|
|
cmp.b #$d0 : bcc .smallDoor
|
|
lda.b #$01 : bra .done ; Middle Door
|
|
.smallDoor lda.b #$00 : bra .done
|
|
.largeDoor lda.b #$02
|
|
.done
|
|
sta.b Scrap04
|
|
asl
|
|
rts
|
|
|
|
; Y is an adjustment for main direction of travel
|
|
; A is a door table row offset
|
|
LoadRoomHorz:
|
|
{
|
|
phb : phk : plb
|
|
sty.b Scrap06 : sta.b Scrap07 : lda.b RoomIndex : pha ; Store normal room on stack
|
|
lda.b Scrap07 : jsr LookupNewRoom ; New room is in A, Room Data is in $00-$01
|
|
lda.b Scrap00 : cmp.b #$03 : bne .gtg
|
|
jsr HorzEdge : pla : bcs .end
|
|
sta.b RoomIndex : bra .end ; Restore normal room, abort (straight staircases and open edges can get in this routine)
|
|
|
|
.gtg ;Good to Go!
|
|
pla ; Throw away normal room (don't fill up the stack)
|
|
lda.b RoomIndex : and.b #$0F : asl a : !SUB.b LinkPosX+1 : !ADD.b Scrap06 : sta.b Scrap02
|
|
ldy.b #$00 : jsr ShiftVariablesMainDir
|
|
|
|
lda.b Scrap01 : and.b #$80 : beq .normal
|
|
ldy.b Scrap06 : cpy.b #$ff : beq +
|
|
lda.b Scrap01 : jsr LoadEastMidpoint : bra ++
|
|
+ lda.b Scrap01 : jsr LoadWestMidpoint
|
|
++ jsr PrepScrollToEdge : bra .scroll
|
|
|
|
.normal
|
|
jsr PrepScrollToNormal
|
|
.scroll
|
|
lda.b Scrap01 : and.b #$40 : pha
|
|
jsr ScrollY
|
|
pla : beq .end
|
|
ldy.b #$06 : jsr ApplyScroll
|
|
.end
|
|
plb ; restore db register
|
|
rts
|
|
}
|
|
|
|
; Y is an adjustment for main direction of travel (stored at $06)
|
|
; A is a door table row offset (stored a $07)
|
|
LoadRoomVert:
|
|
{
|
|
phb : phk : plb
|
|
sty.b Scrap06 : sta.b Scrap07 : lda.b RoomIndex : pha ; Store normal room on stack
|
|
lda.b Scrap07 : jsr LookupNewRoom ; New room is in A, Room Data is in $00-$01
|
|
lda.b Scrap00 : cmp.b #$03 : bne .gtg
|
|
jsr VertEdge : pla : bcs .end
|
|
sta.b RoomIndex : bra .end ; Restore normal room, abort (straight staircases and open edges can get in this routine)
|
|
.gtg ;Good to Go!
|
|
pla ; Throw away normal room (don't fill up the stack)
|
|
lda.b RoomIndex : and.b #$F0 : lsr #3 : !SUB.b LinkPosY+1 : !ADD.b Scrap06 : sta.b Scrap02
|
|
|
|
lda.b Scrap01 : and.b #$80 : beq .notEdge
|
|
ldy.b #$01 : jsr ShiftVariablesMainDir
|
|
ldy.b Scrap06 : cpy.b #$ff : beq +
|
|
lda.b Scrap01 : jsr LoadSouthMidpoint : bra ++
|
|
+ lda.b Scrap01 : jsr LoadNorthMidpoint
|
|
++ jsr PrepScrollToEdge : bra .scroll
|
|
|
|
.notEdge
|
|
lda.b Scrap01 : and.b #$03 : cmp.b #$03 : bne .normal
|
|
jsr ScrollToInroomStairs
|
|
stz.w $046d
|
|
bra .end
|
|
.normal
|
|
ldy.b #$01 : jsr ShiftVariablesMainDir
|
|
jsr PrepScrollToNormal
|
|
.scroll
|
|
lda.b Scrap01 : and.b #$40 : sta.w $046d
|
|
jsr ScrollX
|
|
.end
|
|
plb ; restore db register
|
|
rts
|
|
}
|
|
|
|
LookupNewRoom: ; expects data offset to be in A
|
|
{
|
|
rep #$30 : and.w #$00FF ;sanitize A reg (who knows what is in the high byte)
|
|
sta.b Scrap00 ; offset in 00
|
|
lda.b PreviousRoom : tax ; probably okay loading $a3 in the high byte
|
|
lda.w DoorOffset,x : and.w #$00FF ;we only want the low byte
|
|
asl #3 : sta.b Scrap02 : !ADD.b Scrap02 : !ADD.b Scrap02 ;multiply by 24 (data size)
|
|
!ADD.b Scrap00 ; should now have the offset of the address I want to load
|
|
tax : lda.w DoorTable,x : sta.b Scrap00
|
|
and.w #$00FF : sta.b RoomIndex ; assign new room
|
|
sep #$30
|
|
rts
|
|
}
|
|
|
|
; INPUTS-- Y: Direction Index , $02: Shift Value
|
|
; Sets high bytes of various registers
|
|
ShiftVariablesMainDir:
|
|
{
|
|
lda.w CoordIndex,y : tax
|
|
lda.b LinkPosY+1,x : !ADD.b Scrap02 : sta.b LinkPosY+1,x ; coordinate update
|
|
lda.w CameraIndex,y : tax
|
|
lda.b $e3,x : !ADD.b Scrap02 : sta.b $e3,x ; scroll register high byte
|
|
lda.w CamQuadIndex,y : tax
|
|
lda.w $0605,x : !ADD.b Scrap02 : sta.w $0605,x ; high bytes of these guys
|
|
lda.w $0607,x : !ADD.b Scrap02 : sta.w $0607,x
|
|
lda.w $0601,x : !ADD.b Scrap02 : sta.w $0601,x
|
|
lda.w $0603,x : !ADD.b Scrap02 : sta.w $0603,x
|
|
rts
|
|
}
|
|
|
|
; Normal Flags should be in $01
|
|
ScrollToInroomStairs:
|
|
{
|
|
jsr PrepScrollToInroomStairs
|
|
ldy.b #$01 : jsr ShiftVariablesMainDir
|
|
jsr ScrollX
|
|
ldy.b #$00 : jsr ApplyScroll
|
|
lda.b RoomIndex : and.b #$0f : cmp.b #$0f : bne +
|
|
stz.b BG1H : stz.b BG2H ; special case camera fix
|
|
lda.b #$1f : sta.b BG1H+1 : sta.b BG2H+1
|
|
+
|
|
rts
|
|
}
|
|
|
|
; Direction should be in $06, Shift Value (see above) in $02 and other info in $01
|
|
; Sets $02, $04, $05, $ee, $045e, $045f and things related to Y coordinate
|
|
PrepScrollToInroomStairs:
|
|
{
|
|
lda.b Scrap01 : and.b #$30 : lsr #3 : tay
|
|
lda.w InroomStairsX,y : sta.b Scrap04
|
|
lda.w InroomStairsX+1,y : sta.b Scrap05
|
|
lda.b Scrap06 : cmp.b #$ff : beq .south
|
|
lda.w InroomStairsY+1,y : bne +
|
|
inc.w $045f ; flag indicating special screen transition
|
|
dec.b Scrap02 ; shift variables further
|
|
stz.b LinkQuadrantV
|
|
lda.b $a8 : and.b #%11111101 : sta.b $a8
|
|
stz.w CameraTargetS+1 ; North scroll target
|
|
inc.w $0603 : inc.w $0607
|
|
dec.w CameraScrollN+1 : dec.w CameraScrollS+1
|
|
+
|
|
lda.w InroomStairsY,y : !ADD.b #$20 : sta.b LinkPosY
|
|
!SUB.b #$38 : sta.w $045e
|
|
lda.b Scrap01 : and.b #$40 : beq +
|
|
lda.b LinkPosY : !ADD.b #$20 : sta.b LinkPosY
|
|
stz.w $045f
|
|
+
|
|
dec.b LinkPosY+1
|
|
%StonewallCheck($1b)
|
|
bra ++
|
|
.south
|
|
lda.w InroomStairsY+1,y : beq +
|
|
inc.w $045f ; flag indicating special screen transition
|
|
inc.b Scrap02 ; shift variables further
|
|
lda.b #$02 : sta.b LinkQuadrantV
|
|
lda.b $a8 : ora.b #%00000010 : sta.b $a8
|
|
inc.w CameraTargetN+1 ; South scroll target
|
|
dec.w $0603 : dec.w $0607
|
|
inc.w CameraScrollN+1 : inc.w CameraScrollS+1
|
|
+
|
|
lda.w InroomStairsY,y : !SUB.b #$20 : sta.b LinkPosY
|
|
!ADD.b #$38 : sta.w $045e
|
|
lda.b Scrap01 : and.b #$40 : beq +
|
|
lda.b LinkPosY : !SUB.b #$20 : sta.b LinkPosY
|
|
stz.w $045f
|
|
+
|
|
inc.b LinkPosY+1
|
|
++
|
|
lda.b Scrap01 : and.b #$04 : lsr #2 : sta.b LinkLayer : bne +
|
|
stz.w $0476
|
|
+ rts
|
|
}
|
|
|
|
; Target pixel should be in A, other info in $01
|
|
; Sets $04 $05 and $ee
|
|
PrepScrollToEdge:
|
|
{
|
|
sta.b Scrap04 : lda.b Scrap01 : and.b #$20 : beq +
|
|
lda.b #01
|
|
+ sta.b Scrap05
|
|
lda.b Scrap01 : and.b #$10 : beq +
|
|
lda.b #01
|
|
+ sta.b LinkLayer : bne +
|
|
stz.w $0476
|
|
+ rts
|
|
}
|
|
|
|
; Normal Flags should be in $01
|
|
; Sets $04 $05 and $ee, and $fe
|
|
PrepScrollToNormal:
|
|
{
|
|
lda.b Scrap01 : sta.b $fe : and.b #$04 : lsr #2 : sta.b LinkLayer ; trap door and layer
|
|
bne +
|
|
stz.w $0476
|
|
+ stz.b Scrap05 : lda.b #$78 : sta.b Scrap04
|
|
lda.b Scrap01 : and.b #$03 : beq .end
|
|
cmp.b #$02 : !BGE +
|
|
lda.b #$f8 : sta.b Scrap04 : bra .end
|
|
+ inc.b Scrap05
|
|
.end rts
|
|
}
|
|
|
|
StraightStairsAdj:
|
|
{
|
|
stx.w $0464 : sty.w SFX2 ; what we wrote over
|
|
lda.l DRMode : beq +
|
|
lda.w $045e : bne .toInroom
|
|
lda.w $046d : beq .noScroll
|
|
sta.b LinkPosX
|
|
ldy.b #$00 : jsr ApplyScroll
|
|
stz.w $046d
|
|
.noScroll
|
|
jsr GetTileAttribute : tax
|
|
lda.b GameSubMode : cmp.b #$12 : beq .goingNorth
|
|
lda.b PreviousRoom : cmp.b #$51 : bne ++
|
|
rep #$20 : lda.w #$0018 : !ADD.b LinkPosY : sta.b LinkPosY : sep #$20 ; special fix for throne room
|
|
jsr GetTileAttribute : tax
|
|
++ lda.l StepAdjustmentDown, X : bra .end
|
|
; lda.b LinkLayer : beq .end
|
|
; rep #$20 : lda.w #$ffe0 : !ADD.b LinkPosY : sta.b LinkPosY : sep #$20
|
|
.goingNorth
|
|
cpx.b #$00 : bne ++
|
|
lda.b RoomIndex : cmp.b #$51 : bne ++
|
|
lda.b #$36 : bra .end ; special fix for throne room
|
|
++ ldy.b LinkLayer : cpy.b #$00 : beq ++
|
|
inx
|
|
++ lda.l StepAdjustmentUp, X
|
|
.end
|
|
pha : lda.w $0462 : and.b #$04 : bne ++
|
|
pla : !ADD.b #$f6 : pha
|
|
++ pla : !ADD.w $0464 : sta.w $0464
|
|
+ rtl
|
|
.toInroom
|
|
lda.b #$32 : sta.w $0464 : stz.w $045e
|
|
rtl
|
|
}
|
|
|
|
GetTileAttribute:
|
|
{
|
|
phk : pea.w .jslrtsreturn-1
|
|
pea.w $82802c
|
|
jml CalculateTransitionLanding ; mucks with x/y sets a to Tile Attribute, I think
|
|
.jslrtsreturn
|
|
rts
|
|
}
|
|
|
|
; 0 open edge
|
|
; 1 nrm door high
|
|
; 2 straight str
|
|
; 3 nrm door low
|
|
; 4 trap door high
|
|
; 5 trap door low (none of these exist on North direction)
|
|
StepAdjustmentUp: ; really North Stairs
|
|
db $00, $f6, $1a, $18, $16, $38
|
|
StepAdjustmentDown: ; really South Stairs
|
|
db $d0, $f6, $10, $1a, $f0, $00
|
|
|
|
StraightStairsFix:
|
|
{
|
|
pha
|
|
lda.l DRMode : bne +
|
|
pla : !ADD.b LinkPosY : sta.b LinkPosY : rtl ;what we wrote over
|
|
+ pla : rtl
|
|
}
|
|
|
|
StraightStairLayerFix:
|
|
{
|
|
lda.l DRMode : beq +
|
|
lda.b LinkLayer : rtl
|
|
+ lda.l LayerOfDestination+3, x : rtl ; what we wrote over
|
|
}
|
|
|
|
DoorToStraight:
|
|
{
|
|
pha
|
|
lda.l DRMode : beq .skip
|
|
pla : bne .end
|
|
pha
|
|
lda.b RoomIndex : cmp.b #$51 : bne .skip
|
|
lda.b #$04 : sta.b $4e
|
|
.skip pla
|
|
.end LDX.w TransitionDirection : CMP.b #$02 ; what we wrote over
|
|
rtl
|
|
}
|
|
|
|
DoorToInroom:
|
|
{
|
|
ldx.w $045e : bne .end
|
|
sta.w $0020, y ; what we wrote over
|
|
.end
|
|
ldx.b #$00 ; what we wrote over
|
|
rtl
|
|
}
|
|
|
|
DoorToInroomEnd:
|
|
{
|
|
ldy.w $045e : beq .vanilla
|
|
cmp.w $045e : bne .return
|
|
stz.w $045e ; clear
|
|
.return
|
|
rtl
|
|
.vanilla
|
|
cmp.l UnderworldTransitionLandingCoordinate, x ; what we wrote over
|
|
rtl
|
|
}
|
|
|
|
StraightStairsTrapDoor:
|
|
{
|
|
lda.w $0464 : bne +
|
|
; reset function
|
|
.reset phk : pea.w .jslrtsreturn-1
|
|
pea.w $82802c
|
|
jml ResetThenCacheRoomEntryProperties ; $10D71 .reset label of Bank02
|
|
.jslrtsreturn
|
|
lda.w TrapDoorFlag : bne ++
|
|
lda.b RoomIndex : cmp.b #$ac : bne .animateTraps
|
|
lda.w $0403 : and.b #$20 : bne .animateTraps
|
|
lda.w $0403 : and.b #$10 : beq ++
|
|
.animateTraps
|
|
lda.b #$05 : sta.b GameSubMode
|
|
inc.w TrapDoorFlag : stz.w TileMapDoorPos : stz.w DoorTimer
|
|
++ JML Underworld_SetBossOrSancMusicUponEntry_long
|
|
+ JML Dungeon_ApproachFixedColor ; what we wrote over
|
|
}
|
|
|
|
InroomStairsTrapDoor:
|
|
{
|
|
lda.w SubModuleInterface : cmp.b #$05 : beq .reset
|
|
lda.b SubSubModule : jml JumpTableLocal ; what we wrote over (essentially)
|
|
.reset
|
|
pla : pla : pla
|
|
jsl StraightStairsTrapDoor_reset
|
|
jml $828b15 ; just some RTS in bank 02
|
|
}
|
|
|
|
HandleSpecialDoorLanding: {
|
|
LDA.l $7F2000,X ; what we wrote over
|
|
SEP #$30
|
|
; A = tiletype
|
|
HandleIncomingDoorState:
|
|
PHA
|
|
LDA.l DRMode : BEQ .noDoor
|
|
LDA.b 1,S : AND.b #$FA : CMP.b #$80 : bne .noDoor
|
|
|
|
.setDoorState
|
|
LDA.w TransitionDirection : AND.b #$02 : BNE + : INC
|
|
+ STA.b $6C
|
|
|
|
.noDoor
|
|
PLA
|
|
CMP.b #$34 : BNE + ; inroom stairs
|
|
PHA : LDA.b #$26 : STA.w $045E : PLA
|
|
+
|
|
RTL
|
|
}
|