Skeetendo

’Cause all games were better on the GBC

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#1 2018-09-14 00:13:37

NobodySociety
Member
Registered: 2018-07-26
Post 9/28

[pokered] Disable saving in Safari Zone

I'm working on solving a lot of the Safari Zone glitches for my hack, and many of them involve saving once inside. I decided to look first into having the start menu check if the current map is any of the Safari maps and if it is, don't display the save option.

This is the code for that from draw_start_menu.asm:

.storeMenuItemCount
    ld [wMaxMenuItem], a ; number of menu items
    ld de, StartMenuPokemonText
    call PrintStartMenuItem
    ld de, StartMenuItemText
    call PrintStartMenuItem
    ld de, wPlayerName ; player's name
    call PrintStartMenuItem
; is the player in the Safari Zone Center?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_CENTER
    jr z, .safariEast
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
;.safariEast    
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
        cp SAFARI_ZONE_EAST
    jr z, .safariWest
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ;d hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.safariWest
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_WEST
    jr z, .safariNorth
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.safariNorth
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_NORTH
    jr z, .safariHouse1
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.safariHouse1
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_1
    jr z, .safariHouse2
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.safariHouse2
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_2
    jr z, .safariHouse3
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.safariHouse3
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_3
    jr z, .safariHouse4
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.safariHouse4
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_4
    jr z, .safariSecretHouse
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.safariSecretHouse
; is the player in the Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_SECRET_HOUSE
    jr z, .notSafari
    call PrintStartMenuItem
    ld de, StartMenuRetireText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret
.notSafari
    ld a, [wd72e]
    bit 6, a ; is the player using the link feature?
; case for not using link feature
    ld de, StartMenuSaveText
    jr z, .printSaveOrResetText
; case for using link feature
    ld de, StartMenuResetText
.printSaveOrResetText
    call PrintStartMenuItem
    ld de, StartMenuOptionText
    call PrintStartMenuItem
    ld de, StartMenuExitText
    call PlaceString
    ld hl, wd730
    res 6, [hl] ; turn pauses between printing letters back on
    ret

The result being either the save option appearing as 9 with full functionality, or just shifting everything down after the 9 so exit is off the screen.

My second Idea was to go into start_sub_menu and play with the save function a little. Once again the goal was to have the routine check the map, then if its in the safari zone, when save is selected, print an error and thats it.

The code from start_sub_menu is this: 

StartMenu_SaveReset:
; is the player in Safari Zone Center?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_CENTER
    jr z, .safariEast
    TX_FAR _CantSaveText
    db "@"
    
.safariEast    
; is the player in Safari Zone East?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_EAST
    jr z, .safariWest
    TX_FAR _CantSaveText
    db "@"
    
.safariWest
; is the player in Safari Zone West?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_WEST
    jr z, .safariNorth
    TX_FAR _CantSaveText
    db "@"
    
.safariNorth
; is the player in the Safari Zone North?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_NORTH
    jr z, .safariHouse1
    TX_FAR _CantSaveText
    db "@"
    
.safariHouse1
; is the player in the Safari Zone Rest House 1?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_1
    jr z, .safariHouse2
    TX_FAR _CantSaveText
    db "@"
    
.safariHouse2
; is the player in the Safari Zone Rest House 2?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_2
    jr z, .safariHouse3
    TX_FAR _CantSaveText
    db "@"
    
.safariHouse3
; is the player in the Safari Zone Rest House 3?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_3
    jr z, .safariHouse4
    TX_FAR _CantSaveText
    db "@"
    
.safariHouse4
; is the player in the Safari Zone Rest House 4?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_REST_HOUSE_4
    jr z, .safariSecretHouse
    TX_FAR _CantSaveText
    db "@"
    
.safariSecretHouse
; is the player in the Safari Zone Secret House?    
    ld a, [wCurMap]
    cp SAFARI_ZONE_SECRET_HOUSE
    jr z, .notSafari
    TX_FAR _CantSaveText
    db "@"
    
.notSafari    
; Normal code resumes here.
    ld a, [wd72e]
    bit 6, a ; is the player using the link feature?
    jp nz, Init
    predef SaveSAV ; save the game
    call LoadScreenTilesFromBuffer2 ; restore saved screen
    jp HoldTextDisplayOpen

This time at least the menu looked correct, but save function fully works still.

The next place I can think to look is predef SaveSAV since its part of the menu script to save, but I'm not sure quite what to do from here.

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#2 2018-09-14 04:39:32

glodfinch
Member
Registered: 2018-09-10
Post 4/11

Re: [pokered] Disable saving in Safari Zone

You were closest with your first method :)

From what you described I think the issue was mostly because there's other sections of code where GameFreak assumed that the menu would have seven entries, so they start to break and be weird when it only has six. Luckily they already set us an example because they hide the Pokedex entry before you receive your Pokedex. Also I found the EVENT_IN_SAFARI_ZONE event constant which greatly simplifies checking if the player is in safari mode or not.

You can see how I implemented it here:
https://github.com/glodfinch/pokered/co … 3775f2e693

Let me know if there's anything I can explain in further detail from that commit.

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#3 2018-09-14 16:11:59

NobodySociety
Member
Registered: 2018-07-26
Post 10/28

Re: [pokered] Disable saving in Safari Zone

It works perfectly! Thanks so much! I dont know why it never occurred to me that GameFreak probably hid the solution in multiple files considering how many ive had to keep open just to add a new pokemon.

And as I was typing the post I was thinking to myself "I bet there's an easier way of checking Safari mode than looking at each individual map." But i had done some things earlier that day with map checking and musta had it on the brain.

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#4 2018-09-15 00:43:02

glodfinch
Member
Registered: 2018-09-10
Post 5/11

Re: [pokered] Disable saving in Safari Zone

I'm glad! I was a little worried I'd messed it up when I split it off to a new branch.

Once I saw the amount of places that had to be modified with the check for safari zone I figured there had to be a better way. I found wSafariSteps in wram.asm, but that doesn't get reset to zero when you exit the safari zone, so I figured there had to be a bit somewhere marking if you're in safari mode or not.

Anyway, happy to help!

Last edited by glodfinch (2018-09-15 00:43:30)

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