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| Tip: Make sure you can beat your own levels without savestates, slowdown, or rewinding. |
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| Sprite Memory Shared Between Areas (Patch + Code) |
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Forum Index - SMW Hacking - Resource and Tool Releases - Sprite Memory Shared Between Areas (Patch + Code) |
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Pages:  1  |
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| Posted on 2009-06-04 07:32:02 PM |
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I downloaded mikeyk's Yoshi Coin sprite, and I was disappointed at the fact that it re-appears when I exit and re-enter the area after Mario gets it. So... I decided to work on a way to prevent it from re-appearing.
I'm posting this for anyone who would like to use it in their own custom sprites.
This code uses the item memory index just like objects do.
First, patch this to your ROM with XKAS. It sets all the values in the table to zero.Codeheader
lorom
!Spr_InterLevelTable = $7F8B00 ;0x200 bytes
org $0491D8
JSR.w ZeroInterLevel
org $04FFB1
ZeroInterLevel: STA.w $0DC2
PHX ; does this even need to be preserved?
REP #%00010000
LDX.w #$0000
SprTblLoop: LDA.b #$00
STA.l !Spr_InterLevelTable,x
INX
CPX.w #$0200
BCC SprTblLoop
SEP #%00010000
PLX
RTS
Add this to the very beginning of the sprite (or you can just type the address directly into the following pieces of code)Code SPR_INTERLEVEL = $7F8B00
Add this to the very beginning of the INIT routine, right after 'dcb "INIT"'Code LDA $161A,x
STA $00
STZ $01
LDA $13BE
REP #%00110000
AND.w #$00FF
XBA
LSR A
CLC
ADC $00
PHX
TAX
SEP #%00100000
LDA SPR_INTERLEVEL,x
PLX
SEP #%00010000
CMP #$00
BEQ NotDestroyed:
STZ $14C8,x
RTL
NotDestroyed:
and use this code to prevent the sprite from reloading. In mikeyk's Yoshi Coin sprite, add it after "BCC NoContact"Code LDA $161A,x
STA $00
STZ $01
LDA $13BE
REP #%00110000
AND.w #$00FF
XBA
LSR A
CLC
ADC $00
PHX
TAX
SEP #%00100000
LDA #$01
STA SPR_INTERLEVEL,x
PLX
SEP #%00010000
By the way, there might be a little bit of room for optimization in this code.
You can also use the table for other purposes, and you can add extra tables by modifying the patch to zero them out.
Here's an example of a modified patch:Codeheader
lorom
!Spr_InterLevelTable = $7F8B00 ;0x200 bytes
!Spr_InterLevelTable2 = $7F8D00 ;0x200 bytes
org $0491D8
JSR.w ZeroInterLevel
org $04FFB1
ZeroInterLevel: STA.w $0DC2
PHX ; does this even need to be preserved?
REP #%00010000
LDX.w #$0000
SprTblLoop: LDA.b #$00
STA.l !Spr_InterLevelTable,x
STA.l !Spr_InterLevelTable2,x
INX
CPX.w #$0200
BCC SprTblLoop
SEP #%00010000
PLX
RTS
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| Posted on 2009-06-04 09:44:33 PM |
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Will you submit this to the patches section? If so, what will it's name be? I remember you talking about this on the IRC.
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| Posted on 2009-06-04 10:55:01 PM |
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I probably won't submit this to the patches section. I'll probably just include it with sprites that use it, since it's completely useless without sprites that use it.
As for a name, I don't know. Maybe something along the lines of "InterLevel Sprite Memory".
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| Posted on 2009-06-05 06:49:31 PM |
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There needs to be a "misc" option in the sidebar...
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| Pages: 1 |
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Forum Index - SMW Hacking - Resource and Tool Releases - Sprite Memory Shared Between Areas (Patch + Code) |
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