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Document the Magikarp bug fix from PR #443

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This commit is contained in:
Remy Oukaour 2017-12-28 14:08:29 -05:00
parent 97dd40284b
commit fe605b2fa7
2 changed files with 12 additions and 11 deletions
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18
docs/bugs_and_glitches.md
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@ -30,7 +30,7 @@ These are known bugs and glitches in the original Pokémon Crystal game: code th
- [Dragon Scale, not Dragon Fang, boosts Dragon-type moves](#dragon-scale-not-dragon-fang-boosts-dragon-type-moves)
- [Daisy's grooming doesn't always increase happiness](#daisys-grooming-doesnt-always-increase-happiness)
- [Magikarp in Lake of Rage are shorter, not longer](#magikarp-in-lake-of-rage-are-shorter-not-longer)
- [Magikarp lengths in Lake of Rage have a unit conversion error](#magikarp-lengths-in-lake-of-rage-have-a-unit-conversion-error)
- [Magikarp length limits have a unit conversion error](#magikarp-length-limits-have-a-unit-conversion-error)
- [Magikarp lengths can be miscalculated](#magikarp-lengths-can-be-miscalculated)
- [Battle transitions fail to account for the enemy's level](#battle-transitions-fail-to-account-for-the-enemys-level)
- [Slot machine payout sound effects cut each other off](#slot-machine-payout-sound-effects-cut-each-other-off)
@ -785,7 +785,7 @@ This is a bug with `LoadEnemyMon.CheckMagikarpArea` in [engine/battle/core.asm](
**Fix:** Change both `jr z, .Happiness` to `jr nz, .Happiness`.
## Magikarp lengths in Lake of Rage have a unit conversion error
## Magikarp length limits have a unit conversion error
This is a bug with `LoadEnemyMon.CheckMagikarpArea` in [engine/battle/core.asm](/engine/battle/core.asm):
@ -795,31 +795,31 @@ This is a bug with `LoadEnemyMon.CheckMagikarpArea` in [engine/battle/core.asm](
ld bc, PlayerID
callfar CalcMagikarpLength
; We're clear if the length is < 1536
; No reason to keep going if length > 1536 (i.e. if length / 256 != 6)
ld a, [wMagikarpLength]
cp HIGH(1536)
cp HIGH(1536) ; this compares to 6'0'', should be cp 5
jr nz, .CheckMagikarpArea
; 5% chance of skipping both size checks
call Random
cp 5 percent
jr c, .CheckMagikarpArea
; Try again if > 1614
; Try again if length > 1615
ld a, [wMagikarpLength + 1]
cp LOW(1616)
cp LOW(1616) ; this compares to 6'80'', should be cp 3
jr nc, .GenerateDVs
; 20% chance of skipping this check
call Random
cp 20 percent - 1
jr c, .CheckMagikarpArea
; Try again if > 1598
; Try again if length > 1599
ld a, [wMagikarpLength + 1]
cp LOW(1600)
cp LOW(1600) ; this compares to 6'64'', should be cp 2
jr nc, .GenerateDVs
```
*To do:* Fix this bug.
**Fix:** Change the three `cp` instructions to use their commented values.
## Magikarp lengths can be miscalculated

5
docs/design_flaws.md
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@ -157,14 +157,14 @@ Modify `GetFrontpicPointer`:
cp UNOWN
jr z, .unown
ld a, [CurPartySpecies]
ld d, BANK(PokemonPicPointers)
ld hl, PokemonPicPointers
ld d, BANK(PokemonPicPointers)
jr .ok
.unown
ld a, [UnownLetter]
ld d, BANK(UnownPicPointers)
ld hl, UnownPicPointers
ld d, BANK(UnownPicPointers)
.ok
dec a
@ -264,6 +264,7 @@ INCBIN "gfx/footprints/charmeleon.1bpp"
INCBIN "gfx/footprints/charizard.1bpp"
INCBIN "gfx/footprints/squirtle.1bpp"
INCBIN "gfx/footprints/wartortle.1bpp"
...
```
Modify `Pokedex_LoadAnyFootprint`: