mattrberry / crab Goto Github PK
View Code? Open in Web Editor NEWA Game Boy, Game Boy Color, and Game Boy Advance emulator in Crystal Lang
License: MIT License
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Mario & Luigi: Superstar Saga :: Missing graphics in pause screen
wrong mask for 8bit write to ppu
(opening this here so you dont forget, also to link this issue for other emudevs with the same bug)
https://github.com/mattrberry/crab/blob/master/src/crab/gba/bus.cr#L173
from gbatek:
Writes to OBJ (6010000h-6017FFFh) (or 6014000h-6017FFFh in Bitmap mode) and to OAM (7000000h-70003FFh) are ignored, the memory content remains unchanged.
Writes to BG (6000000h-600FFFFh) (or 6000000h-6013FFFh in Bitmap mode) and to Palette (5000000h-50003FFh) are writing the new 8bit value to BOTH upper and lower 8bits of the addressed halfword, ie. "[addr AND NOT 1]=data*101h".
with the mask you currently have, it results in an imagine like this
screen_record-2022-03-25_02.33.33.mp4
here's an implementation of the masking if you need a reference https://github.com/ITotalJustice/notorious_beeg/blob/57e87ed423233709883f6b15693b1057d252e95e/src/core/mem.cpp#L592.
Mario & Luigi: Superstar Saga :: Missing sprites on title screen
All title screen sprites are missing
Acrobat Kid (Japan) :: Missing text on title screen
Tony Hawk's Pro Skater 2 :: Save Failed
Tactics Ogre: The Knight of Lodis :: Hangs on black screen after "new game"
Detailed image:
Acrobat Kid (Japan) :: Missing menu after pressing `start` on title screen
Mario & Luigi: Superstar Saga
Acrobat Kid (Japan) :: Flashing line across menu
Acrobat Kid (Japan)
Mario & Luigi: Superstar Saga :: Completely borked graphics in game
Mario & Luigi: Superstar Saga :: Messed up graphics in start screen
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