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[BotW] Update weather pack to actually work

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No longer a proof of concept. The game checks if the value isn't correct, so it would be overwritten. This just freezes the value using some code cave code nearby the fence skip thing.
This commit is contained in:
Crementif 2019-03-24 14:20:46 +01:00
parent 3e8f82ce92
commit 27eacec767
2 changed files with 27 additions and 16 deletions
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37
Mods/BreathOfTheWild_Weather/patches.txt
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@ -1,23 +1,34 @@
[BotwV208]
moduleMatches = 0x6267BFD0
codeCaveSize = 0x14
codeCaveSize = 0x20
# Constants
0x00000000 = .byte $weatherByte
_weatherConst = 0x00000000
0x0000000 = .byte $weatherByte ; This address holds the value set by the presets
_weatherConst = 0x0000000 ; Makes a symbol of the value above
_weatherAddress = 0x3FF7DB24 ; This symbol points to the weather address
# Code that changes the weather to our constant
# Code that changes the weather address value.
# This code is executed each frame since there's too many addresses that mess with the original one, and changing those caused crashes. Shouldn't affect performance regardless.
_changeWeather = 0x00000004
0x00000004 = lis r26, _weatherConst@ha
0x00000008 = lbz r26, _weatherConst@l(r26)
0x0000000C = stb r26, 0x18(r30)
0x00000010 = blr
0x0000004 = lis r6, _weatherConst@ha ; Load first half of the address to the "weather value"
0x0000008 = lbz r6, _weatherConst@l(r6) ; Use the first half of the "weather value" address to load the full value set by the current preset
0x000000C = lis r5, _weatherAddress@ha ; Load first half of the actual "weather address"
0x0000010 = stb r6, _weatherAddress@l(r5) ; Store the "weather value" byte into the "weather address", using the first half of that address
0x0000014 = addi r6, r1, 0x18 ; Do the original instruction that got replaced by the code jump
0x0000018 = blr ; Return to the code before the code jump
0x3668FEC = bla _changeWeather
0x31FACD4 = bla _changeWeather
# Original Instructions
# .text:03668FE4 stfs f28, 0x14(r30)
# Disable original instructions that write the weather value, just because
0x3668FE8 = nop
0x3668FEC = nop
# How to find the memory address where the weather is stored (if it needs to be updated):
# 1. Make 1 breakpoint on one of the following instructions using Cemu's PPC debugger:
# .text:03668FE8 stb r0, 0x19(r30)
# .text:03668FEC stb r26, 0x18(r30) # Here we jump to our code cave since it originally sets the weather byte in the game.
# .text:03668FF0 b loc_3669434
# .text:03668FEC stb r26, 0x18(r30)
# 2. Fast travel into an area where the weather isn't constant
# 3. After it hits the breakpoint, look at the register view and find the value after R30.
# 4. Use a hex calculator to add 0x18 to that address and you'll have the address.

6
Mods/BreathOfTheWild_Weather/rules.txt
View File

@ -18,15 +18,15 @@ name = Raining (dark clouds and winds blowing)
$weatherByte:int = 3
[Preset]
name = Clear weather (distant thunder)
name = Gray weather (no rain and dark clouds)
$weatherByte:int = 6
[Preset]
name = Raining (thundering clouds)
name = Storm with thunder
$weatherByte:int = 7
[Preset]
name = Raining (fog)
name = Fog and rain
$weatherByte:int = 8
# If anyone finds accurate names for these, feel free to fill them in.