Port the REV01 Background Effects
From Sonic Retro
(Original guide by jman2050)
Looking at the REV01 version of Sonic 1, I can see why it's Rev01. They pretty much completely overhauled the entire BG deformation part of the engine. The drawing system has been changed (and from what I've seen, more similar to the way Sonic 2 does things) and the deformation data for every level has been changed to fit this new code. Also, in every level besides SBZ2, it was used to enhance the deformation effects. To see the difference in your own Sonic 1 ROM hack, you'll have to do the following...
Contents
The Steps You Need
Step 1
First, we'll do the easiest change. Go to label Obj0A_WobbleData in Hivebrain's 2005 disassembly and replace the entire block with this:
Obj0A_WobbleData:
dc.b 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2
dc.b 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 3
dc.b 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2
dc.b 2, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, -1, -1
dc.b -1, -1, -1, -2, -2, -2, -2, -2, -3, -3, -3, -3, -3
dc.b -3, -3, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4
dc.b -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4
dc.b -4, -4, -4, -4, -4, -3, -3, -3, -3, -3, -3, -3, -2
dc.b -2, -2, -2, -2, -1, -1, -1, -1, -1
dc.b 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2
dc.b 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 3
dc.b 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2
dc.b 2, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, -1, -1
dc.b -1, -1, -1, -2, -2, -2, -2, -2, -3, -3, -3, -3, -3
dc.b -3, -3, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4
dc.b -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4
dc.b -4, -4, -4, -4, -4, -3, -3, -3, -3, -3, -3, -3, -2
dc.b -2, -2, -2, -2, -1, -1, -1, -1, -1The programmers extended this array so it would also be usable by the deformation data even though it was designed to be used by the water bubbles.
Step 2
Next, we'll do the BGScroll data. Go to BGScroll_GHZ in the disassembly. Replace everything from there until the end of BGScroll_End with the following:
BgScroll_GHZ: ; XREF: BgScroll_Index
clr.l ($FFFFF708).w
clr.l ($FFFFF70C).w
clr.l ($FFFFF714).w
clr.l ($FFFFF71C).w
lea ($FFFFA800).w,a2
clr.l (a2)+
clr.l (a2)+
clr.l (a2)+
rts
; ===========================================================================
BgScroll_LZ: ; XREF: BgScroll_Index
asr.l #1,d0
move.w d0,($FFFFF70C).w
rts
; ===========================================================================
BgScroll_MZ: ; XREF: BgScroll_Index
rts
; ===========================================================================
BgScroll_SLZ: ; XREF: BgScroll_Index
asr.l #1,d0
addi.w #$C0,d0
move.w d0,($FFFFF70C).w
clr.l ($FFFFF708).w
rts
; ===========================================================================
BgScroll_SYZ: ; XREF: BgScroll_Index
asl.l #4,d0
move.l d0,d2
asl.l #1,d0
add.l d2,d0
asr.l #8,d0
addq.w #1,d0
move.w d0,($FFFFF70C).w
clr.l ($FFFFF708).w
rts
; ===========================================================================
BgScroll_SBZ: ; XREF: BgScroll_Index
andi.w #$7F8,d0
asr.w #3,d0
addq.w #1,d0
move.w d0,($FFFFF70C).w
rts
; ===========================================================================
BgScroll_End: ; XREF: BgScroll_Index
move.w ($FFFFF700).w,d0
asr.w #1,d0
move.w d0,($FFFFF708).w
move.w d0,($FFFFF710).w
asr.w #2,d0
move.w d0,d1
add.w d0,d0
add.w d1,d0
move.w d0,($FFFFF718).w
clr.l ($FFFFF70C).w
clr.l ($FFFFF714).w
clr.l ($FFFFF71C).w
lea ($FFFFA800).w,a2
clr.l (a2)+
clr.l (a2)+
clr.l (a2)+
rtsThe starting deformation data for every stage needed to be changed. To be precise, it prevents bugs that occur in the scrolling in SBZ and SYZ, and prevents a bug that causes GHZ's bg not to appear at all.
Step 3
Next, we'll do the deformation data itself. Go to Deform_GHZ, and replace everything from there until the end of Deform_SBZ, straight down (right before ScrollHoriz) with the following:
Deform_GHZ:
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #5,d4
move.l d4,d1
asl.l #1,d4
add.l d1,d4
moveq #0,d6
bsr.w ScrollBlock6
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #7,d4
moveq #0,d6
bsr.w ScrollBlock5
lea ($FFFFCC00).w,a1
move.w ($FFFFF704).w,d0
andi.w #$7FF,d0
lsr.w #5,d0
neg.w d0
addi.w #$20,d0 ; ' '
bpl.s Deform_GHZ_1
moveq #0,d0
Deform_GHZ_1: ; XREF: Deform_GHZ
move.w d0,d4
move.w d0,($FFFFF618).w
move.w ($FFFFF700).w,d0
cmpi.b #4,($FFFFF600).w
bne.s Deform_GHZ_2
moveq #0,d0
Deform_GHZ_2: ; XREF: Deform_GHZ
neg.w d0
swap d0
lea ($FFFFA800).w,a2
addi.l #$10000,(a2)+
addi.l #$C000,(a2)+
addi.l #$8000,(a2)+
move.w ($FFFFA800).w,d0
add.w ($FFFFF718).w,d0
neg.w d0
move.w #$1F,d1
sub.w d4,d1
bcs.s Deform_GHZ_4
Deform_GHZ_3: ; XREF: Deform_GHZ
move.l d0,(a1)+
dbf d1,Deform_GHZ_3
Deform_GHZ_4: ; XREF: Deform_GHZ
move.w ($FFFFA804).w,d0
add.w ($FFFFF718).w,d0
neg.w d0
move.w #$F,d1
Deform_GHZ_5: ; XREF: Deform_GHZ
move.l d0,(a1)+
dbf d1,Deform_GHZ_5
move.w ($FFFFA808).w,d0
add.w ($FFFFF718).w,d0
neg.w d0
move.w #$F,d1
Deform_GHZ_6: ; XREF: Deform_GHZ
move.l d0,(a1)+
dbf d1,Deform_GHZ_6
move.w #$2F,d1 ; '/'
move.w ($FFFFF718).w,d0
neg.w d0
Deform_GHZ_7: ; XREF: Deform_GHZ
move.l d0,(a1)+
dbf d1,Deform_GHZ_7
move.w #$27,d1 ; '''
move.w ($FFFFF710).w,d0
neg.w d0
Deform_GHZ_8: ; XREF: Deform_GHZ
move.l d0,(a1)+
dbf d1,Deform_GHZ_8
move.w ($FFFFF710).w,d0
move.w ($FFFFF700).w,d2
sub.w d0,d2
ext.l d2
asl.l #8,d2
divs.w #$68,d2 ; 'h'
ext.l d2
asl.l #8,d2
moveq #0,d3
move.w d0,d3
move.w #$47,d1 ; 'G'
add.w d4,d1
Deform_GHZ_9: ; XREF: Deform_GHZ
move.w d3,d0
neg.w d0
move.l d0,(a1)+
swap d3
add.l d2,d3
swap d3
dbf d1,Deform_GHZ_9
rts
; End of function Deform_GHZ
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
Deform_LZ:
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #7,d4
move.w ($FFFFF73C).w,d5
ext.l d5
asl.l #7,d5
bsr.w ScrollBlock1
move.w ($FFFFF70C).w,($FFFFF618).w
lea (LZ_Wave_Data).l,a3
lea (Obj0A_WobbleData).l,a2
move.b ($FFFFF7D8).w,d2
move.b d2,d3
addi.w #$80,($FFFFF7D8).w ; '€'
add.w ($FFFFF70C).w,d2
andi.w #$FF,d2
add.w ($FFFFF704).w,d3
andi.w #$FF,d3
lea ($FFFFCC00).w,a1
move.w #$DF,d1 ; 'ß'
move.w ($FFFFF700).w,d0
neg.w d0
move.w d0,d6
swap d0
move.w ($FFFFF708).w,d0
neg.w d0
move.w ($FFFFF646).w,d4
move.w ($FFFFF704).w,d5
Deform_LZ_1: ; XREF: Deform_LZ
cmp.w d4,d5
bge.s Deform_LZ_2
move.l d0,(a1)+
addq.w #1,d5
addq.b #1,d2
addq.b #1,d3
dbf d1,Deform_LZ_1
rts
; ===========================================================================
Deform_LZ_2: ; XREF: Deform_LZ
move.b (a3,d3.w),d4
ext.w d4
add.w d6,d4
move.w d4,(a1)+
move.b (a2,d2.w),d4
ext.w d4
add.w d0,d4
move.w d4,(a1)+
addq.b #1,d2
addq.b #1,d3
dbf d1,Deform_LZ_2
rts
; End of function Deform_LZ
; ===========================================================================
LZ_Wave_Data: dc.b 1, 1, 2, 2, 3, 3, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b $FF,$FF,$FE,$FE,$FD,$FD,$FD,$FD,$FE,$FE,$FF,$FF, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 1, 1, 2, 2, 3, 3, 3, 3, 2, 2, 1, 1, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
dc.b 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
Deform_MZ:
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #6,d4
move.l d4,d1
asl.l #1,d4
add.l d1,d4
moveq #2,d6
bsr.w ScrollBlock4
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #6,d4
moveq #6,d6
bsr.w ScrollBlock6
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #7,d4
moveq #4,d6
bsr.w ScrollBlock5
move.w #$200,d0
move.w ($FFFFF704).w,d1
subi.w #$1C8,d1
bcs.s Deform_MZ_1
move.w d1,d2
add.w d1,d1
add.w d2,d1
asr.w #2,d1
add.w d1,d0
Deform_MZ_1: ; XREF: Deform_MZ
move.w d0,($FFFFF714).w
move.w d0,($FFFFF71C).w
bsr.w ScrollBlock3
move.w ($FFFFF70C).w,($FFFFF618).w
move.b ($FFFFF756).w,d0
or.b ($FFFFF758).w,d0
or.b d0,($FFFFF75A).w
clr.b ($FFFFF756).w
clr.b ($FFFFF758).w
lea ($FFFFA800).w,a1
move.w ($FFFFF700).w,d2
neg.w d2
move.w d2,d0
asr.w #2,d0
sub.w d2,d0
ext.l d0
asl.l #3,d0
divs.w #5,d0
ext.l d0
asl.l #4,d0
asl.l #8,d0
moveq #0,d3
move.w d2,d3
asr.w #1,d3
move.w #4,d1
Deform_MZ_2: ; XREF: Deform_MZ
move.w d3,(a1)+
swap d3
add.l d0,d3
swap d3
dbf d1,Deform_MZ_2
move.w ($FFFFF718).w,d0
neg.w d0
move.w #1,d1
Deform_MZ_3: ; XREF: Deform_MZ
move.w d0,(a1)+
dbf d1,Deform_MZ_3
move.w ($FFFFF710).w,d0
neg.w d0
move.w #8,d1
Deform_MZ_4: ; XREF: Deform_MZ
move.w d0,(a1)+
dbf d1,Deform_MZ_4
move.w ($FFFFF708).w,d0
neg.w d0
move.w #$F,d1
Deform_MZ_5: ; XREF: Deform_MZ
move.w d0,(a1)+
dbf d1,Deform_MZ_5
lea ($FFFFA800).w,a2
move.w ($FFFFF70C).w,d0
subi.w #$200,d0
move.w d0,d2
cmpi.w #$100,d0
bcs.s Deform_MZ_6
move.w #$100,d0
Deform_MZ_6: ; XREF: Deform_MZ
andi.w #$1F0,d0
lsr.w #3,d0
lea (a2,d0.w),a2
bra.w Deform_All
; ===========================================================================
Deform_SLZ:
move.w ($FFFFF73C).w,d5
ext.l d5
asl.l #7,d5
bsr.w ScrollBlock2
move.w ($FFFFF70C).w,($FFFFF618).w
lea ($FFFFA800).w,a1
move.w ($FFFFF700).w,d2
neg.w d2
move.w d2,d0
asr.w #3,d0
sub.w d2,d0
ext.l d0
asl.l #4,d0
divs.w #$1C,d0
ext.l d0
asl.l #4,d0
asl.l #8,d0
moveq #0,d3
move.w d2,d3
move.w #$1B,d1
Deform_SLZ_1: ; XREF: Deform_MZ
move.w d3,(a1)+
swap d3
add.l d0,d3
swap d3
dbf d1,Deform_SLZ_1
move.w d2,d0
asr.w #3,d0
move.w d0,d1
asr.w #1,d1
add.w d1,d0
move.w #4,d1
Deform_SLZ_2: ; XREF: Deform_MZ
move.w d0,(a1)+
dbf d1,Deform_SLZ_2
move.w d2,d0
asr.w #2,d0
move.w #4,d1
Deform_SLZ_3: ; XREF: Deform_MZ
move.w d0,(a1)+
dbf d1,Deform_SLZ_3
move.w d2,d0
asr.w #1,d0
move.w #$1D,d1
Deform_SLZ_4: ; XREF: Deform_MZ
move.w d0,(a1)+
dbf d1,Deform_SLZ_4
lea ($FFFFA800).w,a2
move.w ($FFFFF70C).w,d0
move.w d0,d2
subi.w #$C0,d0 ; 'À'
andi.w #$3F0,d0
lsr.w #3,d0
lea (a2,d0.w),a2
Deform_All: ; XREF: Deform_MZ, Deform_SYZ, ...
lea ($FFFFCC00).w,a1
move.w #$E,d1
move.w ($FFFFF700).w,d0
neg.w d0
swap d0
andi.w #$F,d2
add.w d2,d2
move.w (a2)+,d0
jmp Deform_All_2(pc,d2.w)
; End of function Deform_MZ
; ===========================================================================
Deform_All_1: ; XREF: Deform_All
move.w (a2)+,d0
Deform_All_2:
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
move.l d0,(a1)+
dbf d1,Deform_All_1
rts
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
Deform_SYZ:
move.w ($FFFFF73C).w,d5
ext.l d5
asl.l #4,d5
move.l d5,d1
asl.l #1,d5
add.l d1,d5
bsr.w ScrollBlock2
move.w ($FFFFF70C).w,($FFFFF618).w
lea ($FFFFA800).w,a1
move.w ($FFFFF700).w,d2
neg.w d2
move.w d2,d0
asr.w #3,d0
sub.w d2,d0
ext.l d0
asl.l #3,d0
divs.w #8,d0
ext.l d0
asl.l #4,d0
asl.l #8,d0
moveq #0,d3
move.w d2,d3
asr.w #1,d3
move.w #7,d1
Deform_SYZ_1: ; XREF: Deform_SYZ
move.w d3,(a1)+
swap d3
add.l d0,d3
swap d3
dbf d1,Deform_SYZ_1
move.w d2,d0
asr.w #3,d0
move.w #4,d1
Deform_SYZ_2: ; XREF: Deform_SYZ
move.w d0,(a1)+
dbf d1,Deform_SYZ_2
move.w d2,d0
asr.w #2,d0
move.w #5,d1
Deform_SYZ_3: ; XREF: Deform_SYZ
move.w d0,(a1)+
dbf d1,Deform_SYZ_3
move.w d2,d0
move.w d2,d1
asr.w #1,d1
sub.w d1,d0
ext.l d0
asl.l #4,d0
divs.w #$E,d0
ext.l d0
asl.l #4,d0
asl.l #8,d0
moveq #0,d3
move.w d2,d3
asr.w #1,d3
move.w #$D,d1
Deform_SYZ_4: ; XREF: Deform_SYZ
move.w d3,(a1)+
swap d3
add.l d0,d3
swap d3
dbf d1,Deform_SYZ_4
lea ($FFFFA800).w,a2
move.w ($FFFFF70C).w,d0
move.w d0,d2
andi.w #$1F0,d0
lsr.w #3,d0
lea (a2,d0.w),a2
bra.w Deform_All
; End of function Deform_SYZ
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
Deform_SBZ:
tst.b ($FFFFFE11).w
bne.w Deform_SBZ_Act2
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #7,d4
moveq #2,d6
bsr.w ScrollBlock4
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #6,d4
moveq #6,d6
bsr.w ScrollBlock6
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #5,d4
move.l d4,d1
asl.l #1,d4
add.l d1,d4
moveq #4,d6
bsr.w ScrollBlock5
moveq #0,d4
move.w ($FFFFF73C).w,d5
ext.l d5
asl.l #5,d5
bsr.w ScrollBlock1_2
move.w ($FFFFF70C).w,d0
move.w d0,($FFFFF714).w
move.w d0,($FFFFF71C).w
move.w d0,($FFFFF618).w
move.b ($FFFFF756).w,d0
or.b ($FFFFF75A).w,d0
or.b d0,($FFFFF758).w
clr.b ($FFFFF756).w
clr.b ($FFFFF75A).w
lea ($FFFFA800).w,a1
move.w ($FFFFF700).w,d2
neg.w d2
asr.w #2,d2
move.w d2,d0
asr.w #1,d0
sub.w d2,d0
ext.l d0
asl.l #3,d0
divs.w #4,d0
ext.l d0
asl.l #4,d0
asl.l #8,d0
moveq #0,d3
move.w d2,d3
move.w #3,d1
Deform_SBZ_1: ; XREF: Deform_SBZ
move.w d3,(a1)+
swap d3
add.l d0,d3
swap d3
dbf d1,Deform_SBZ_1
move.w ($FFFFF718).w,d0
neg.w d0
move.w #9,d1
Deform_SBZ_2: ; XREF: Deform_SBZ
move.w d0,(a1)+
dbf d1,Deform_SBZ_2
move.w ($FFFFF710).w,d0
neg.w d0
move.w #6,d1
Deform_SBZ_3: ; XREF: Deform_SBZ
move.w d0,(a1)+
dbf d1,Deform_SBZ_3
move.w ($FFFFF708).w,d0
neg.w d0
move.w #$A,d1
Deform_SBZ_4: ; XREF: Deform_SBZ
move.w d0,(a1)+
dbf d1,Deform_SBZ_4
lea ($FFFFA800).w,a2
move.w ($FFFFF70C).w,d0
move.w d0,d2
andi.w #$1F0,d0
lsr.w #3,d0
lea (a2,d0.w),a2
bra.w Deform_All
; ===========================================================================
Deform_SBZ_Act2: ; XREF: Deform_SBZ
move.w ($FFFFF73A).w,d4
ext.l d4
asl.l #6,d4
move.w ($FFFFF73C).w,d5
ext.l d5
asl.l #5,d5
bsr.w ScrollBlock1
move.w ($FFFFF70C).w,($FFFFF618).w
lea ($FFFFCC00).w,a1
move.w #$DF,d1 ; 'ß'
move.w ($FFFFF700).w,d0
neg.w d0
swap d0
move.w ($FFFFF708).w,d0
neg.w d0
Deform_SBZ_Act2_1: ; XREF: Deform_SBZ
move.l d0,(a1)+
dbf d1,Deform_SBZ_Act2_1
rts
; End of function Deform_SBZStep 4
The new Bg drawing system required a different method of scrolling the BGs themselves. Go to ScrollBlock1 and replace everything from there until the end of ScrollBlock4 with the following:
ScrollBlock1: ; XREF: Deform_LZ, Deform_SBZ
move.l ($FFFFF708).w,d2
move.l d2,d0
add.l d4,d0
move.l d0,($FFFFF708).w
move.l d0,d1
swap d1
andi.w #$10,d1
move.b ($FFFFF74C).w,d3
eor.b d3,d1
bne.s ScrollBlock1_2
eori.b #$10,($FFFFF74C).w
sub.l d2,d0
bpl.s ScrollBlock1_1
bset #2,($FFFFF756).w
bra.s ScrollBlock1_2
; ===========================================================================
ScrollBlock1_1: ; XREF: ScrollBlock1
bset #3,($FFFFF756).w
ScrollBlock1_2: ; XREF: ScrollBlock1, Deform_SBZ, ...
move.l ($FFFFF70C).w,d3
move.l d3,d0
add.l d5,d0
move.l d0,($FFFFF70C).w
move.l d0,d1
swap d1
andi.w #$10,d1
move.b ($FFFFF74D).w,d2
eor.b d2,d1
bne.s ScrollBlock1_End
eori.b #$10,($FFFFF74D).w
sub.l d3,d0
bpl.s ScrollBlock1_3
bset #0,($FFFFF756).w
rts
; ===========================================================================
ScrollBlock1_3: ; XREF: ScrollBlock1
bset #1,($FFFFF756).w
ScrollBlock1_End: ; XREF: ScrollBlock1
rts
; End of function ScrollBlock1
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
ScrollBlock2: ; XREF: Deform_MZ, Deform_SYZ
move.l ($FFFFF70C).w,d3
move.l d3,d0
add.l d5,d0
move.l d0,($FFFFF70C).w
move.l d0,d1
swap d1
andi.w #$10,d1
move.b ($FFFFF74D).w,d2
eor.b d2,d1
bne.s ScrollBlock2_End
eori.b #$10,($FFFFF74D).w
sub.l d3,d0
bpl.s ScrollBlock2_1
bset #4,($FFFFF756).w
rts
; ===========================================================================
ScrollBlock2_1: ; XREF: ScrollBlock2
bset #5,($FFFFF756).w
ScrollBlock2_End: ; XREF: ScrollBlock2
rts
; End of function ScrollBlock2
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
ScrollBlock3: ; XREF: Deform_MZ
move.w ($FFFFF70C).w,d3
move.w d0,($FFFFF70C).w
move.w d0,d1
andi.w #$10,d1
move.b ($FFFFF74D).w,d2
eor.b d2,d1
bne.s ScrollBlock3_End
eori.b #$10,($FFFFF74D).w
sub.w d3,d0
bpl.s ScrollBlock3_1
bset #0,($FFFFF756).w
rts
; ===========================================================================
ScrollBlock3_1: ; XREF: ScrollBlock3
bset #1,($FFFFF756).w
ScrollBlock3_End: ; XREF: ScrollBlock3
rts
; End of function ScrollBlock3
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
ScrollBlock4: ; XREF: Deform_MZ, Deform_SBZ
move.l ($FFFFF708).w,d2
move.l d2,d0
add.l d4,d0
move.l d0,($FFFFF708).w
move.l d0,d1
swap d1
andi.w #$10,d1
move.b ($FFFFF74C).w,d3
eor.b d3,d1
bne.s ScrollBlock4_End
eori.b #$10,($FFFFF74C).w
sub.l d2,d0
bpl.s ScrollBlock4_1
bset d6,($FFFFF756).w
bra.s ScrollBlock4_End
; ===========================================================================
ScrollBlock4_1: ; XREF: ScrollBlock4
addq.b #1,d6
bset d6,($FFFFF756).w
ScrollBlock4_End: ; XREF: ScrollBlock4
rts
; End of function ScrollBlock4
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
ScrollBlock5: ; XREF: Deform_GHZ, Deform_MZ, ...
move.l ($FFFFF710).w,d2
move.l d2,d0
add.l d4,d0
move.l d0,($FFFFF710).w
move.l d0,d1
swap d1
andi.w #$10,d1
move.b ($FFFFF74E).w,d3
eor.b d3,d1
bne.s ScrollBlock5_End
eori.b #$10,($FFFFF74E).w
sub.l d2,d0
bpl.s ScrollBlock5_1
bset d6,($FFFFF758).w
bra.s ScrollBlock5_End
; ===========================================================================
ScrollBlock5_1: ; XREF: ScrollBlock5
addq.b #1,d6
bset d6,($FFFFF758).w
ScrollBlock5_End: ; XREF: ScrollBlock5
rts
; End of function ScrollBlock5
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
ScrollBlock6: ; XREF: Deform_GHZ, Deform_MZ, ...
move.l ($FFFFF718).w,d2
move.l d2,d0
add.l d4,d0
move.l d0,($FFFFF718).w
move.l d0,d1
swap d1
andi.w #$10,d1
move.b ($FFFFF750).w,d3
eor.b d3,d1
bne.s ScrollBlock6_End
eori.b #$10,($FFFFF750).w
sub.l d2,d0
bpl.s ScrollBlock6_1
bset d6,($FFFFF75A).w
bra.s ScrollBlock6_End
; ===========================================================================
ScrollBlock6_1: ; XREF: ScrollBlock6
addq.b #1,d6
bset d6,($FFFFF75A).w
ScrollBlock6_End: ; XREF: ScrollBlock6
rts
; End of function ScrollBlock6Don't worry that there are six BGScroll functions now, that's taken cared of.
Step 5
Finally, the biggest part: the BG drawing code. Go to sub_6886 and replace everything from there until the end of LoadTilesFromStart2 (that's a VERY long way, up until MainLoadBlockLoad) with the following:
sub_6886:
lea ($C00004).l,a5
lea ($C00000).l,a6
lea ($FFFFF756).w,a2
lea ($FFFFF708).w,a3
lea ($FFFFA440).w,a4
move.w #$6000,d2
bsr.w sub_6D0A
lea ($FFFFF758).w,a2
lea ($FFFFF710).w,a3
bra.w sub_6DA6
; End of function sub_6886
; ---------------------------------------------------------------------------
; Subroutine to display correct tiles as you move
; ---------------------------------------------------------------------------
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
LoadTilesAsYouMove: ; XREF: Demo_Time
lea ($C00004).l,a5
lea ($C00000).l,a6
lea ($FFFFFF32).w,a2
lea ($FFFFFF18).w,a3
lea ($FFFFA440).w,a4
move.w #$6000,d2
bsr.w sub_6D0A
lea ($FFFFFF34).w,a2
lea ($FFFFFF20).w,a3
bsr.w sub_6DA6
lea ($FFFFFF36).w,a2
lea ($FFFFFF28).w,a3
bsr.w sub_6EA4
lea ($FFFFFF30).w,a2
lea ($FFFFFF10).w,a3
lea ($FFFFA400).w,a4
move.w #$4000,d2
tst.b ($FFFFF745).w
beq.s Draw_FG
move.b #0,($FFFFF745).w ;Reset the redraw flag
moveq #-$10,d4 ;Go to top line oflevel data relative camera position
moveq #$F,d6 ;
Draw_All:
movem.l d4-d6,-(sp) ; This whole routine basically redraws the whole
moveq #-$10,d5 ; area instead of merely a line of tiles
move.w d4,d1
bsr.w Calc_VRAM_Pos
move.w d1,d4
moveq #-$10,d5
bsr.w DrawTiles_LR
movem.l (sp)+,d4-d6
addi.w #$10,d4
dbf d6,Draw_All
rts
Draw_FG:
tst.b (a2)
beq.s locret_6D08
bclr #0,(a2)
beq.s loc_6CBE
moveq #-$10,d4
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
moveq #-$10,d4
moveq #-$10,d5
bsr.w DrawTiles_LR
loc_6CBE:
bclr #1,(a2)
beq.s loc_6CD8
move.w #$E0,d4 ; 'à'
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
move.w #$E0,d4 ; 'à'
moveq #-$10,d5
bsr.w DrawTiles_LR
loc_6CD8:
bclr #2,(a2)
beq.s loc_6CEE
moveq #-$10,d4
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
moveq #-$10,d4
moveq #-$10,d5
bsr.w DrawTiles_TB
loc_6CEE:
bclr #3,(a2)
beq.s locret_6D08
moveq #-$10,d4
move.w #$140,d5
bsr.w Calc_VRAM_Pos
moveq #-$10,d4
move.w #$140,d5
bsr.w DrawTiles_TB
locret_6D08:
rts
; End of function LoadTilesAsYouMove
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
sub_6D0A:
tst.b (a2)
beq.w locret_6DA4
bclr #0,(a2)
beq.s loc_6D26
moveq #-$10,d4
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
moveq #-$10,d4
moveq #-$10,d5
bsr.w DrawTiles_LR
loc_6D26:
bclr #1,(a2)
beq.s loc_6D40
move.w #$E0,d4 ; 'à'
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
move.w #$E0,d4 ; 'à'
moveq #-$10,d5
bsr.w DrawTiles_LR
loc_6D40:
bclr #2,(a2)
beq.s loc_6D56
moveq #-$10,d4
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
moveq #-$10,d4
moveq #-$10,d5
bsr.w DrawTiles_TB
loc_6D56:
bclr #3,(a2)
beq.s loc_6D70
moveq #-$10,d4
move.w #$140,d5
bsr.w Calc_VRAM_Pos
moveq #-$10,d4
move.w #$140,d5
bsr.w DrawTiles_TB
loc_6D70:
bclr #4,(a2)
beq.s loc_6D88
moveq #-$10,d4
moveq #0,d5
bsr.w loc_7176
moveq #-$10,d4
moveq #0,d5
moveq #$1F,d6
bsr.w DrawTiles_LR3
loc_6D88:
bclr #5,(a2)
beq.s locret_6DA4
move.w #$E0,d4 ; 'à'
moveq #0,d5
bsr.w loc_7176
move.w #$E0,d4 ; 'à'
moveq #0,d5
moveq #$1F,d6
bsr.w DrawTiles_LR3
locret_6DA4:
rts
; End of function sub_6D0A
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
sub_6DA6:
tst.b (a2)
beq.w locret_6DF2
cmpi.b #5,($FFFFFE10).w
beq.w loc_6E16
bclr #0,(a2)
beq.s loc_6DD2
move.w #$70,d4 ; 'p'
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
move.w #$70,d4 ; 'p'
moveq #-$10,d5
moveq #2,d6
bsr.w DrawTiles_TB2
loc_6DD2:
bclr #1,(a2)
beq.s locret_6DF2
move.w #$70,d4 ; 'p'
move.w #$140,d5
bsr.w Calc_VRAM_Pos
move.w #$70,d4 ; 'p'
move.w #$140,d5
moveq #2,d6
bsr.w DrawTiles_TB2
locret_6DF2:
rts
; ===========================================================================
unk_6DF4: dc.b 0 ;
unk_6DF5: dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 0 ;
; ===========================================================================
loc_6E16:
moveq #-$10,d4
bclr #0,(a2)
bne.s loc_6E28
bclr #1,(a2)
beq.s loc_6E72
move.w #$E0,d4 ; 'à'
loc_6E28:
lea (unk_6DF5).l,a0
move.w ($FFFFF70C).w,d0
add.w d4,d0
andi.w #$1F0,d0
lsr.w #4,d0
move.b (a0,d0.w),d0
lea (unk_6FE4).l,a3
movea.w (a3,d0.w),a3
beq.s loc_6E5E
moveq #-$10,d5
movem.l d4-d5,-(sp)
bsr.w Calc_VRAM_Pos
movem.l (sp)+,d4-d5
bsr.w DrawTiles_LR
bra.s loc_6E72
; ===========================================================================
loc_6E5E:
moveq #0,d5
movem.l d4-d5,-(sp)
bsr.w loc_7176
movem.l (sp)+,d4-d5
moveq #$1F,d6
bsr.w DrawTiles_LR3
loc_6E72:
tst.b (a2)
bne.s loc_6E78
rts
; ===========================================================================
loc_6E78:
moveq #-$10,d4
moveq #-$10,d5
move.b (a2),d0
andi.b #-$58,d0
beq.s loc_6E8C
lsr.b #1,d0
move.b d0,(a2)
move.w #$140,d5
loc_6E8C:
lea (unk_6DF4).l,a0
move.w ($FFFFF70C).w,d0
andi.w #$1F0,d0
lsr.w #4,d0
lea (a0,d0.w),a0
bra.w loc_6FEC
; End of function sub_6DA6
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
sub_6EA4:
tst.b (a2)
beq.w locret_6EF0
cmpi.b #2,($FFFFFE10).w
beq.w loc_6F54
bclr #0,(a2)
beq.s loc_6ED0_2
move.w #$40,d4 ; '@'
moveq #-$10,d5
bsr.w Calc_VRAM_Pos
move.w #$40,d4 ; '@'
moveq #-$10,d5
moveq #2,d6
bsr.w DrawTiles_TB2
loc_6ED0_2:
bclr #1,(a2)
beq.s locret_6EF0
move.w #$40,d4 ; '@'
move.w #$140,d5
bsr.w Calc_VRAM_Pos
move.w #$40,d4 ; '@'
move.w #$140,d5
moveq #2,d6
bsr.w DrawTiles_TB2
locret_6EF0:
rts
; ===========================================================================
unk_6EF2: dc.b 0 ;
unk_6EF3: dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 6 ;
dc.b 6 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 2 ;
dc.b 0 ;
; ===========================================================================
loc_6F54:
moveq #-$10,d4
bclr #0,(a2)
bne.s loc_6F66
bclr #1,(a2)
beq.s loc_6FAE
move.w #$E0,d4 ; 'à'
loc_6F66:
lea (unk_6EF3).l,a0
move.w ($FFFFF70C).w,d0
subi.w #$200,d0
add.w d4,d0
andi.w #$7F0,d0
lsr.w #4,d0
move.b (a0,d0.w),d0
movea.w unk_6FE4(pc,d0.w),a3
beq.s loc_6F9A
moveq #-$10,d5
movem.l d4-d5,-(sp)
bsr.w Calc_VRAM_Pos
movem.l (sp)+,d4-d5
bsr.w DrawTiles_LR
bra.s loc_6FAE
; ===========================================================================
loc_6F9A:
moveq #0,d5
movem.l d4-d5,-(sp)
bsr.w loc_7176
movem.l (sp)+,d4-d5
moveq #$1F,d6
bsr.w DrawTiles_LR3
loc_6FAE:
tst.b (a2)
bne.s loc_6FB4
rts
; ===========================================================================
loc_6FB4:
moveq #-$10,d4
moveq #-$10,d5
move.b (a2),d0
andi.b #-$58,d0
beq.s loc_6FC8
lsr.b #1,d0
move.b d0,(a2)
move.w #$140,d5
loc_6FC8:
lea (unk_6EF2).l,a0
move.w ($FFFFF70C).w,d0
subi.w #$200,d0
andi.w #$7F0,d0
lsr.w #4,d0
lea (a0,d0.w),a0
bra.w loc_6FEC
; ===========================================================================
unk_6FE4: dc.b $FF ;
dc.b $18 ;
dc.b $FF ;
dc.b $18 ;
dc.b $FF ;
dc.b $20 ;
dc.b $FF ;
dc.b $28 ; (
; ===========================================================================
loc_6FEC:
moveq #$F,d6
move.l #$800000,d7
loc_6FF4:
moveq #0,d0
move.b (a0)+,d0
btst d0,(a2)
beq.s loc_701C
movea.w unk_6FE4(pc,d0.w),a3
movem.l d4-d5/a0,-(sp)
movem.l d4-d5,-(sp)
bsr.w sub_712A
movem.l (sp)+,d4-d5
bsr.w Calc_VRAM_Pos
bsr.w sub_70AC
movem.l (sp)+,d4-d5/a0
loc_701C:
addi.w #$10,d4
dbf d6,loc_6FF4
clr.b (a2)
rts
; End of function sub_6EA4
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
DrawTiles_LR:
moveq #$15,d6
; End of function DrawTiles_LR
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
DrawTiles_LR2:
move.l #$800000,d7
move.l d0,d1
loc_7032:
movem.l d4-d5,-(sp)
bsr.w sub_712A
move.l d1,d0
bsr.w sub_70AC
addq.b #4,d1
andi.b #$7F,d1 ; '?'
movem.l (sp)+,d4-d5
addi.w #$10,d5
dbf d6,loc_7032
rts
; End of function DrawTiles_LR2
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
DrawTiles_LR3:
move.l #$800000,d7
move.l d0,d1
loc_705C:
movem.l d4-d5,-(sp)
bsr.w loc_712C
move.l d1,d0
bsr.w sub_70AC
addq.b #4,d1
andi.b #$7F,d1 ; '?'
movem.l (sp)+,d4-d5
addi.w #$10,d5
dbf d6,loc_705C
rts
; End of function DrawTiles_LR3
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
DrawTiles_TB:
moveq #$F,d6
; End of function DrawTiles_TB
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
DrawTiles_TB2:
move.l #$800000,d7
move.l d0,d1
loc_7088:
movem.l d4-d5,-(sp)
bsr.w sub_712A
move.l d1,d0
bsr.w sub_70AC
addi.w #$100,d1
andi.w #$FFF,d1
movem.l (sp)+,d4-d5
addi.w #$10,d4
dbf d6,loc_7088
rts
; End of function DrawTiles_TB2
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
sub_70AC:
or.w d2,d0
swap d0
btst #4,(a0)
bne.s loc_70E8
btst #3,(a0)
bne.s loc_70C8
move.l d0,(a5)
move.l (a1)+,(a6)
add.l d7,d0
move.l d0,(a5)
move.l (a1)+,(a6)
rts
; ===========================================================================
loc_70C8:
move.l d0,(a5)
move.l (a1)+,d4
eori.l #$8000800,d4
swap d4
move.l d4,(a6)
add.l d7,d0
move.l d0,(a5)
move.l (a1)+,d4
eori.l #$8000800,d4
swap d4
move.l d4,(a6)
rts
; ===========================================================================
loc_70E8:
btst #3,(a0)
bne.s loc_710A
move.l d0,(a5)
move.l (a1)+,d5
move.l (a1)+,d4
eori.l #$10001000,d4
move.l d4,(a6)
add.l d7,d0
move.l d0,(a5)
eori.l #$10001000,d5
move.l d5,(a6)
rts
; ===========================================================================
loc_710A:
move.l d0,(a5)
move.l (a1)+,d5
move.l (a1)+,d4
eori.l #$18001800,d4
swap d4
move.l d4,(a6)
add.l d7,d0
move.l d0,(a5)
eori.l #$18001800,d5
swap d5
move.l d5,(a6)
rts
; End of function sub_70AC
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
sub_712A:
add.w (a3),d5
loc_712C:
add.w 4(a3),d4
lea ($FFFFB000).w,a1
move.w d4,d3
lsr.w #1,d3
andi.w #$380,d3
lsr.w #3,d5
move.w d5,d0
lsr.w #5,d0
andi.w #$7F,d0 ; '?'
add.w d3,d0
moveq #-1,d3
move.b (a4,d0.w),d3
beq.s locret_7172
subq.b #1,d3
andi.w #$7F,d3 ; '?'
ror.w #7,d3
add.w d4,d4
andi.w #$1E0,d4
andi.w #$1E,d5
add.w d4,d3
add.w d5,d3
movea.l d3,a0
move.w (a0),d3
andi.w #$3FF,d3
lsl.w #3,d3
adda.w d3,a1
locret_7172:
rts
; End of function sub_712A
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
Calc_VRAM_Pos:
add.w (a3),d5
loc_7176:
add.w 4(a3),d4
andi.w #$F0,d4 ; 'ð'
andi.w #$1F0,d5
lsl.w #4,d4
lsr.w #2,d5
add.w d5,d4
moveq #3,d0
swap d0
move.w d4,d0
rts
; End of function Calc_VRAM_Pos
; ===========================================================================
add.w 4(a3),d4
add.w (a3),d5
andi.w #$F0,d4 ; 'ð'
andi.w #$1F0,d5
lsl.w #4,d4
lsr.w #2,d5
add.w d5,d4
moveq #2,d0
swap d0
move.w d4,d0
rts
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
LoadTilesFromStart:
lea ($C00004).l,a5
lea ($C00000).l,a6
lea ($FFFFF700).w,a3
lea ($FFFFA400).w,a4
move.w #$4000,d2
bsr.s LoadTilesFromStart2
lea ($FFFFF708).w,a3
lea ($FFFFA440).w,a4
move.w #$6000,d2
tst.b ($FFFFFE10).w
beq.w loc_7220
cmpi.b #2,($FFFFFE10).w
beq.w loc_725A
cmpi.w #$500,($FFFFFE10).w
beq.w loc_7288
cmpi.b #6,($FFFFFE10).w
beq.w loc_7220
; End of function LoadTilesFromStart
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
LoadTilesFromStart2:
moveq #-$10,d4
moveq #$F,d6
loc_71FC:
movem.l d4-d6,-(sp)
moveq #0,d5
move.w d4,d1
bsr.w Calc_VRAM_Pos
move.w d1,d4
moveq #0,d5
moveq #$1F,d6
bsr.w DrawTiles_LR2
movem.l (sp)+,d4-d6
addi.w #$10,d4
dbf d6,loc_71FC
rts
; End of function LoadTilesFromStart2
; ===========================================================================
loc_7220:
moveq #0,d4
moveq #$F,d6
loc_7224:
movem.l d4-d6,-(sp)
lea (unk_724A).l,a0
move.w ($FFFFF70C).w,d0
add.w d4,d0
andi.w #$F0,d0 ; 'ð'
bsr.w sub_72BA
movem.l (sp)+,d4-d6
addi.w #$10,d4
dbf d6,loc_7224
rts
; ===========================================================================
unk_724A: dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 6 ;
dc.b 6 ;
dc.b 6 ;
dc.b 4 ;
dc.b 4 ;
dc.b 4 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
dc.b 0 ;
; ===========================================================================
loc_725A:
moveq #-$10,d4
moveq #$F,d6
loc_725E:
movem.l d4-d6,-(sp)
lea (unk_6EF3).l,a0
move.w ($FFFFF70C).w,d0
subi.w #$200,d0
add.w d4,d0
andi.w #$7F0,d0
bsr.w sub_72BA
movem.l (sp)+,d4-d6
addi.w #$10,d4
dbf d6,loc_725E
rts
; ===========================================================================
loc_7288:
moveq #-$10,d4
moveq #$F,d6
loc_728C:
movem.l d4-d6,-(sp)
lea (unk_6DF5).l,a0
move.w ($FFFFF70C).w,d0
add.w d4,d0
andi.w #$1F0,d0
bsr.w sub_72BA
movem.l (sp)+,d4-d6
addi.w #$10,d4
dbf d6,loc_728C
rts
; ===========================================================================
unk_72B2: dc.b $F7 ; ÷
dc.b 8 ;
dc.b $F7 ; ÷
dc.b 8 ;
dc.b $F7 ; ÷
dc.b $10 ;
dc.b $F7 ; ÷
dc.b $18 ;
; ||||||||||||||| S U B R O U T I N E |||||||||||||||||||||||||||||||||||||||
sub_72BA:
lsr.w #4,d0
move.b (a0,d0.w),d0
movea.w unk_72B2(pc,d0.w),a3
beq.s loc_72DA
moveq #-$10,d5
movem.l d4-d5,-(sp)
bsr.w Calc_VRAM_Pos
movem.l (sp)+,d4-d5
bsr.w DrawTiles_LR
bra.s locret_72EE
; ===========================================================================
loc_72DA:
moveq #0,d5
movem.l d4-d5,-(sp)
bsr.w loc_7176
movem.l (sp)+,d4-d5
moveq #$1F,d6
bsr.w DrawTiles_LR3
locret_72EE:
rts
; End of function sub_72BAStep 6
Assuming you haven't changed the backgrounds of your levels, compile it and give it a go!
Credits
- Hivebrain - for attempting this first
- Tweaker - for his assistance when I had some issues to resolve.
Extra step
If you get errors upon compiling, you'll need to follow this extra step.
Fixing the errors
Alright, so after you've followed the main guide, you'll need to go here in your disasm:
Obj89: ; XREF: Obj_Index
moveq #0,d0
move.b $24(a0),d0
move.w Obj89_Index(pc,d0.w),d1
jmp Obj89_Index(pc,d1.w)
; ===========================================================================
Obj89_Index: dc.w Obj89_Main-Obj89_Index
dc.w Obj89_Move-Obj89_Index
dc.w Obj89_GotoCredits-Obj89_Index
; ===========================================================================
Obj89_Main: ; XREF: Obj89_Index
addq.b #2,$24(a0)
move.w #-$20,8(a0) ; object starts outside the level boundary
move.w #$D8,$A(a0)
move.l #Map_obj89,4(a0)
move.w #$5C5,2(a0)
move.b #0,1(a0)
move.b #0,$18(a0)
Obj89_Move: ; XREF: Obj89_Index
cmpi.w #$C0,8(a0) ; has object reached $C0?
beq.s Obj89_Delay ; if yes, branch
addi.w #$10,8(a0) ; move object to the right
bra.w DisplaySprite
; ===========================================================================
Obj89_Delay: ; XREF: Obj89_Move
addq.b #2,$24(a0)
move.w #120,$30(a0) ; set duration for delay (2 seconds)
Obj89_GotoCredits: ; XREF: Obj89_Index
subq.w #1,$30(a0) ; subtract 1 from duration
bpl.s Obj89_Display
move.b #$1C,($FFFFF600).w ; exit to credits
Obj89_Display:
bra.w DisplaySpriteYou should see this line occurring twice:
bra.w DisplaySpriteThis is the problem. The code you just installed for the better background effects is bigger than the original code, and those lines that I mentioned have a specific branch range. Since some code has shifted, it is now out of range, causing the error. So let's change this code to something a bit more, shall I say, pliable. So, replace those two lines with this:
jmp DisplaySpriteThat simple "jmp" command should do the trick.
And that's it! The errors should be gone! (If you still get errors, leave a message on this guide's talk page explaining how it all happens and I'll try to create a fix for it.) Have fun, and enjoy the Rev01 background effects!
(Oh, and you can still use this fix without following the actual guide, as it still works, and should make your life easier in case something else happens like the error I just explained above.)
|Port the REV01 Background Effects]]