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Document more bugs

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This commit is contained in:
Remy Oukaour 2017-12-12 22:58:20 -05:00
parent c85587d973
commit 10eb426e40
7 changed files with 322 additions and 38 deletions
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6
battle/ai/items.asm
View File

@ -749,7 +749,7 @@ TextJump_EnemyWithdrew: ; 384d0
Function384d5: ; This appears to be unused
call AIUsedItemSound
call AI_HealStatus
ld a, X_SPEED
ld a, FULL_HEAL_RED ; X_SPEED
jp PrintText_UsedItemOn_AND_AIUpdateHUD
; 384e0
@ -761,6 +761,10 @@ AI_HealStatus: ; 384e0
xor a
ld [hl], a
ld [EnemyMonStatus], a
; Bug: this should reset SUBSTATUS_NIGHTMARE too
; Uncomment the lines below to fix
; ld hl, EnemySubStatus1
; res SUBSTATUS_NIGHTMARE, [hl]
ld hl, EnemySubStatus5
res SUBSTATUS_TOXIC, [hl]
ret

3
battle/ai/scoring.asm
View File

@ -1876,7 +1876,8 @@ AI_Smart_MeanLook: ; 38dfb
pop hl
jp z, AIDiscourageMove
; 80% chance to greatly encourage this move if the enemy is badly poisoned (weird).
; 80% chance to greatly encourage this move if the enemy is badly poisoned (buggy).
; Should check PlayerSubStatus5 instead.
ld a, [EnemySubStatus5]
bit SUBSTATUS_TOXIC, a
jr nz, .asm_38e26

6
battle/core.asm
View File

@ -5998,7 +5998,7 @@ CheckPlayerHasUsableMoves: ; 3e786
swap a
and $f
ld b, a
ld d, $5
ld d, NUM_MOVES + 1
xor a
.loop
dec d
@ -6011,7 +6011,9 @@ CheckPlayerHasUsableMoves: ; 3e786
jr .loop
.done
and a ; This is probably a bug, and will result in a move with PP Up confusing the game.
; Bug: this will result in a move with PP Up confusing the game.
; Replace with "and $3f" to fix.
and a
ret nz
.force_struggle

1
constants/item_constants.asm
View File

@ -272,6 +272,7 @@ ITEM_FROM_MEM EQU $FF
; leftovers from red
SAFARI_BALL EQU $08 ; MOON_STONE
MOON_STONE_RED EQU $0A ; BURN_HEAL
FULL_HEAL_RED EQU $34 ; X_SPEED
; mail
MAIL_MSG_LENGTH EQU $20

333
docs/bugs.md
View File

@ -1,13 +1,103 @@
# Bugs and Glitches
## Thick Club and Light Ball can decrease damage done with boosted (Special) Attack
([Video](https://www.youtube.com/watch?v=rGqu3d3pdok&t=450))
This is a bug with `SpeciesItemBoost` in [battle/effect_commands.asm](battle/effect_commands.asm):
```asm
; Double the stat
sla l
rl h
ret
```
**Fix:**
```asm
; Double the stat
sla l
rl h
ld a, 999 / $100
cp h
jr c, .cap
ld a, 999 % $100
cp l
ret nc
.cap
ld h, 999 / $100
ld l, 999 % $100
ret
```
## Metal Powder can increase damage taken with boosted (Special) Defense
([Video](https://www.youtube.com/watch?v=rGqu3d3pdok&t=450))
This is a bug with `DittoMetalPowder` in [battle/effect_commands.asm](battle/effect_commands.asm):
```asm
ld a, c
srl a
add c
ld c, a
ret nc
srl b
ld a, b
and a
jr nz, .done
inc b
.done
scf
rr c
ret
```
**Fix:**
```asm
ld a, c
srl a
add c
ld c, a
ret nc
srl b
ld a, b
and a
jr nz, .done
inc b
.done
scf
rr c
ld a, 999 / $100
cp b
jr c, .cap
ld a, 999 % $100
cp c
ret nc
.cap
ld b, 999 / $100
ld c, 999 % $100
ret
```
## Belly Drum sharply boosts Attack even with under 50% HP
([Video](https://www.youtube.com/watch?v=zuCLMikWo4Y))
This is a bug with `BattleCommand_BellyDrum` in [battle/effect_commands.asm](battle/effect_commands.asm):
```
```asm
BattleCommand_BellyDrum: ; 37c1a
; bellydrum
; This command is buggy because it raises the user's attack
@ -25,7 +115,7 @@ BattleCommand_BellyDrum: ; 37c1a
**Fix:**
```
```asm
BattleCommand_BellyDrum: ; 37c1a
; bellydrum
callab GetHalfMaxHP
@ -39,13 +129,13 @@ BattleCommand_BellyDrum: ; 37c1a
```
## HP bar animation is slower with more HP
## HP bar animation is slow for high HP
([Video](https://www.youtube.com/watch?v=SE-BfsFgZVM))
This is a bug with `LongAnim_UpdateVariables` in [engine/anim_hp_bar.asm](engine/anim_hp_bar.asm):
```
```asm
; This routine is buggy. The result from ComputeHPBarPixels is stored
; in e. However, the pop de opcode deletes this result before it is even
; used. The game then proceeds as though it never deleted that output.
@ -67,6 +157,32 @@ This is a bug with `LongAnim_UpdateVariables` in [engine/anim_hp_bar.asm](engine
**Fix:** Move `ld a, e` to right after `call ComputeHPBarPixels`.
## HP bar animation off-by-one error for low HP
([Video](https://www.youtube.com/watch?v=9KyNVIZxJvI))
This is a bug with `ShortHPBar_CalcPixelFrame` in [engine/anim_hp_bar.asm](engine/anim_hp_bar.asm):
```asm
ld b, 0
; This routine is buggy. If [wCurHPAnimMaxHP] * [wCurHPBarPixels] is divisible
; by 48, the loop runs one extra time. To fix, uncomment the line below.
.loop
ld a, l
sub 6 * 8
ld l, a
ld a, h
sbc $0
ld h, a
; jr z, .done
jr c, .done
inc b
jr .loop
```
**Fix:** Uncomment `jr z, .done`.
## Experience underflow for level 1 Pokémon with Medium-Slow growth rate
([Video](https://www.youtube.com/watch?v=SXH8u0plHrE))
@ -75,7 +191,7 @@ This can bring Pokémon straight from level 1 to 100 by gaining just a few exper
This is a bug with `CalcExpAtLevel` in [main.asm](main.asm):
```
```asm
CalcExpAtLevel: ; 50e47
; (a/b)*n**3 + c*n**2 + d*n - e
ld a, [BaseGrowthRate]
@ -89,7 +205,7 @@ CalcExpAtLevel: ; 50e47
**Fix:**
```
```asm
CalcExpAtLevel: ; 50e47
; (a/b)*n**3 + c*n**2 + d*n - e
ld a, d
@ -121,7 +237,7 @@ CalcExpAtLevel: ; 50e47
This is a bug with `Text_ABoostedStringBuffer2ExpPoints` and `Text_StringBuffer2ExpPoints` in [text/common_2.asm](text/common_2.asm):
```
```asm
Text_ABoostedStringBuffer2ExpPoints::
text ""
line "a boosted"
@ -138,7 +254,84 @@ Text_StringBuffer2ExpPoints::
prompt
```
**Fix:** Change `deciram StringBuffer2, 2, 4` to `deciram StringBuffer2, 2, 5`.
**Fix:** Change both `deciram StringBuffer2, 2, 4` to `deciram StringBuffer2, 2, 5`.
## NPC use of Full Heal or Full Restore does not cure Nightmare status
([Video](https://www.youtube.com/watch?v=rGqu3d3pdok&t=322)
This is a bug with `AI_HealStatus` in [battle/ai/items.asm](battle/ai/items.asm):
```asm
AI_HealStatus: ; 384e0
ld a, [CurOTMon]
ld hl, OTPartyMon1Status
ld bc, PARTYMON_STRUCT_LENGTH
call AddNTimes
xor a
ld [hl], a
ld [EnemyMonStatus], a
; Bug: this should reset SUBSTATUS_NIGHTMARE too
; Uncomment the lines below to fix
; ld hl, EnemySubStatus1
; res SUBSTATUS_NIGHTMARE, [hl]
ld hl, EnemySubStatus5
res SUBSTATUS_TOXIC, [hl]
ret
; 384f7
```
**Fix:** Uncomment `ld hl, EnemySubStatus1` and `res SUBSTATUS_NIGHTMARE, [hl]`.
## "Smart" AI encourages Mean Look if its own Pokémon is badly poisoned
([Video](https://www.youtube.com/watch?v=cygMO-zHTls))
This is a bug with `AI_Smart_MeanLook` in [battle/ai/scoring.asm](battle/ai/scoring.asm):
```asm
; 80% chance to greatly encourage this move if the enemy is badly poisoned (buggy).
; Should check PlayerSubStatus5 instead.
ld a, [EnemySubStatus5]
bit SUBSTATUS_TOXIC, a
jr nz, .asm_38e26
```
**Fix:** Change `EnemySubStatus5` to `PlayerSubStatus5`.
## A Disabled, PP Up–enhanced move may not trigger automatic Struggling
([Video](https://www.youtube.com/watch?v=1v9x4SgMggs))
This is a bug with `CheckPlayerHasUsableMoves` in [battle/core.asm](battle/core.asm):
```asm
.done
; Bug: this will result in a move with PP Up confusing the game.
; Replace with "and $3f" to fix.
and a
ret nz
.force_struggle
ld hl, BattleText_PkmnHasNoMovesLeft
call StdBattleTextBox
ld c, 60
call DelayFrames
xor a
ret
```
**Fix:** Change `and a` to `and $3f`.
## Counter and Mirror Coat still work if the opponent uses an item
([Video](https://www.youtube.com/watch?v=uRYyzKRatFk))
*To do:* Identify specific code causing this bug and fix it.
## Present damage is incorrect in link battles
@ -149,7 +342,7 @@ This bug existed for all battles in Gold and Silver, and was only fixed for sing
This is a bug with `BattleCommand_Present` in [battle/effects/present.asm](battle/effects/present.asm):
```
```asm
BattleCommand_Present: ; 37874
; present
@ -172,7 +365,7 @@ BattleCommand_Present: ; 37874
**Fix:**
```
```asm
BattleCommand_Present: ; 37874
; present
@ -188,7 +381,7 @@ BattleCommand_Present: ; 37874
This is a bug with `PokeBall` in [items/item_effects.asm](items/item_effects.asm):
```
```asm
.statuscheck
; This routine is buggy. It was intended that SLP and FRZ provide a higher
; catch rate than BRN/PSN/PAR, which in turn provide a higher catch rate than
@ -220,7 +413,7 @@ This is a bug with `PokeBall` in [items/item_effects.asm](items/item_effects.asm
This is a bug with `MoonBallMultiplier` in [items/item_effects.asm](items/item_effects.asm):
```
```asm
MoonBallMultiplier:
; This function is buggy.
; Intent: multiply catch rate by 4 if mon evolves with moon stone
@ -246,7 +439,7 @@ MoonBallMultiplier:
This is a bug with `LoveBallMultiplier` in [items/item_effects.asm](items/item_effects.asm):
```
```asm
LoveBallMultiplier:
; This function is buggy.
; Intent: multiply catch rate by 8 if mons are of same species, different sex
@ -268,7 +461,7 @@ LoveBallMultiplier:
This is a bug with `FastBallMultiplier` in [items/item_effects.asm](items/item_effects.asm):
```
```asm
FastBallMultiplier:
; This function is buggy.
; Intent: multiply catch rate by 4 if enemy mon is in one of the three
@ -294,7 +487,7 @@ FastBallMultiplier:
This is a bug with `PokeBall` in [items/item_effects.asm](items/item_effects.asm):
```
```asm
ld a, [CurItem]
cp FRIEND_BALL
jr nz, .SkipBoxMonFriendBall
@ -311,7 +504,7 @@ This is a bug with `PokeBall` in [items/item_effects.asm](items/item_effects.asm
This is a bug with `ItemAttributes` in [items/item_attributes.asm](items/item_attributes.asm):
```
```asm
; DRAGON FANG
item_attribute 100, 0, 0, CANT_SELECT, ITEM, ITEMMENU_NOUSE, ITEMMENU_NOUSE
@ -328,7 +521,7 @@ This is a bug with `ItemAttributes` in [items/item_attributes.asm](items/item_at
This is a bug with `MassageOrHaircut` in [event/special.asm](event/special.asm):
```
```asm
; Bug: Subtracting $ff from $ff fails to set c.
; This can result in overflow into the next data array.
; In the case of getting a massage from Daisy, we bleed
@ -366,18 +559,89 @@ CopyPokemonName_Buffer1_Buffer3: ; 746e
**Fix:**
```
```asm
Data_DaisyMassage: ; 746b
db $80, 2, HAPPINESS_MASSAGE ; 50% chance
db $ff, 2, HAPPINESS_MASSAGE ; 50% chance
```
## Magikarp in Lake of Rage are shorter, not longer
This is a bug with `LoadEnemyMon.CheckMagikarpArea` in [battle/core.asm](battle/core.asm):
```asm
.CheckMagikarpArea:
; The z checks are supposed to be nz
; Instead, all maps in GROUP_LAKE_OF_RAGE (mahogany area)
; and routes 20 and 44 are treated as Lake of Rage
; This also means Lake of Rage Magikarp can be smaller than ones
; caught elsewhere rather than the other way around
; Intended behavior enforces a minimum size at Lake of Rage
; The real behavior prevents size flooring in the Lake of Rage area
ld a, [MapGroup]
cp GROUP_LAKE_OF_RAGE
jr z, .Happiness
ld a, [MapNumber]
cp MAP_LAKE_OF_RAGE
jr z, .Happiness
```
**Fix:** Change both `jr z, .Happiness` to `jr nz, .Happiness`.
## Battle transitions fail to account for the enemy's level
([Video](https://www.youtube.com/watch?v=eij_1060SMc))
This is a bug with `StartTrainerBattle_DetermineWhichAnimation` in [engine/battle_start.asm](engine/battle_start.asm):
```
StartTrainerBattle_DetermineWhichAnimation: ; 8c365 (23:4365)
; The screen flashes a different number of times depending on the level of
; your lead Pokemon relative to the opponent's.
; BUG: BattleMonLevel and EnemyMonLevel are not set at this point, so whatever
; values happen to be there will determine the animation.
ld de, 0
ld a, [BattleMonLevel]
add 3
ld hl, EnemyMonLevel
cp [hl]
jr nc, .okay
set 0, e
.okay
ld a, [wPermission]
cp CAVE
jr z, .okay2
cp PERM_5
jr z, .okay2
cp DUNGEON
jr z, .okay2
set 1, e
.okay2
ld hl, .StartingPoints
add hl, de
ld a, [hl]
ld [wJumptableIndex], a
ret
; 8c38f (23:438f)
.StartingPoints: ; 8c38f
db 1, 9
db 16, 24
; 8c393
```
*To do:* Fix this bug.
## No bump noise if standing on tile `$3E`
This is a bug with `DoPlayerMovement.CheckWarp` in [engine/player_movement.asm](engine/player_movement.asm):
```
```asm
; Bug: Since no case is made for STANDING here, it will check
; [.edgewarps + $ff]. This resolves to $3e at $8035a.
; This causes wd041 to be nonzero when standing on tile $3e,
@ -401,7 +665,7 @@ This is a bug with `DoPlayerMovement.CheckWarp` in [engine/player_movement.asm](
**Fix:**
```
```asm
ld a, [WalkingDirection]
cp STANDING
jr z, .not_warp
@ -419,6 +683,13 @@ This is a bug with `DoPlayerMovement.CheckWarp` in [engine/player_movement.asm](
```
## Surfing directly across a map connection does not load the new map
([Video](https://www.youtube.com/watch?v=XFOWvMNG-zw))
*To do:* Identify specific code causing this bug and fix it.
## `CheckOwnMon` only checks the first five letters of OT names
([Video](https://www.youtube.com/watch?v=GVTTmReM4nQ))
@ -427,7 +698,7 @@ This bug can allow you to talk to Eusine in Celadon City and encounter Ho-Oh wit
[engine/search.asm](engine/search.asm):
```
```asm
; check OT
; This only checks five characters, which is fine for the Japanese version,
; but in the English version the player name is 7 characters, so this is wrong.
@ -463,7 +734,7 @@ endr
This is a bug with `PokeBall` in [items/item_effects.asm](items/item_effects.asm):
```
```asm
; BUG: callba overwrites a,
; and GetItemHeldEffect takes b anyway.
@ -487,7 +758,7 @@ This is a bug with `PokeBall` in [items/item_effects.asm](items/item_effects.asm
[engine/scripting.asm](engine/scripting.asm):
```
```asm
ScriptCall:
; Bug: The script stack has a capacity of 5 scripts, yet there is
; nothing to stop you from pushing a sixth script. The high part
@ -525,7 +796,7 @@ ScriptCall:
[engine/overworld.asm](engine/overworld.asm):
```
```asm
LoadSpriteGFX: ; 14306
; Bug: b is not preserved, so
; it's useless as a next count.
@ -560,7 +831,7 @@ LoadSpriteGFX: ; 14306
[engine/wildmons.asm](engine/wildmons.asm):
```
```asm
ChooseWildEncounter: ; 2a14f
...
@ -583,7 +854,7 @@ ValidateTempWildMonSpecies: ; 2a4a0
**Fix:**
```
```asm
ld a, b
ld [CurPartyLevel], a
ld b, [hl]
@ -599,7 +870,7 @@ ValidateTempWildMonSpecies: ; 2a4a0
[engine/events.asm](engine/events.asm):
```
```asm
; Bug: If IsInArray returns nc, data at bc will be executed as code.
push bc
ld de, 3
@ -627,7 +898,7 @@ ValidateTempWildMonSpecies: ; 2a4a0
[event/bug_contest_2.asm](event/bug_contest_2.asm):
```
```asm
Special_CheckBugContestContestantFlag: ; 139ed
; Checks the flag of the Bug Catching Contestant whose index is loaded in a.
@ -665,7 +936,7 @@ BugCatchingContestantEventFlagTable: ; 139fe
[home/init.asm](home/init.asm):
```
```asm
ClearWRAM:: ; 25a
; Wipe swappable WRAM banks (1-7)
; Assumes CGB or AGB
@ -693,7 +964,7 @@ ClearWRAM:: ; 25a
[tilesets/animations.asm](tilesets/animations.asm):
```
```asm
GetForestTreeFrame: ; fc54c
; Return 0 if a is even, or 2 if odd.
and a
@ -722,7 +993,7 @@ GetForestTreeFrame: ; fc54c
**Fix:**
```
```asm
GetForestTreeFrame: ; fc54c
; Return 0 if a is even, or 2 if odd.
and 1

4
engine/anim_hp_bar.asm
View File

@ -382,7 +382,10 @@ ShortHPBar_CalcPixelFrame: ; d839
and a
jr z, .return_zero
call AddNTimes
ld b, 0
; This routine is buggy. If [wCurHPAnimMaxHP] * [wCurHPBarPixels] is divisible
; by 48, the loop runs one extra time. To fix, uncomment the line below.
.loop
ld a, l
sub 6 * 8
@ -390,6 +393,7 @@ ShortHPBar_CalcPixelFrame: ; d839
ld a, h
sbc $0
ld h, a
; jr z, .done
jr c, .done
inc b
jr .loop

7
engine/battle_start.asm
View File

@ -196,9 +196,10 @@ FlashyTransitionToBattle: ; 8c314
StartTrainerBattle_DetermineWhichAnimation: ; 8c365 (23:4365)
; The screen flashes a different number of
; times depending on the level of your lead
; Pokemon relative to the opponent's.
; The screen flashes a different number of times depending on the level of
; your lead Pokemon relative to the opponent's.
; BUG: BattleMonLevel and EnemyMonLevel are not set at this point, so whatever
; values happen to be there will determine the animation.
ld de, 0
ld a, [BattleMonLevel]
add 3