Miroirs/crab
1
0
Fork 0
mirror of https://github.com/mattrberry/crab.git synced 2024-11-16 19:49:30 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

adjust address limit for vram u8 writes based on display mode (fix OpenLara)

Browse source
This commit is contained in:
Matthew Berry 2022-03-26 13:58:18 -07:00
parent 020aafd156
commit 0f21ea6aea
2 changed files with 8 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
src/crab/gba/bus.cr
View file

@ -169,8 +169,10 @@ module GBA
when 0x4 then @gba.mmio[index] = value
when 0x5 then (@gba.ppu.pram.to_unsafe + (index & 0x3FE)).as(HalfWord*).value = 0x0101_u16 * value
when 0x6
address = 0x1FFFE_u32 & index # todo ignored range is different when in bitmap mode
(@gba.ppu.vram.to_unsafe + address).as(HalfWord*).value = 0x0101_u16 * value if address <= 0x0FFFF
limit = @gba.ppu.bitmap? ? 0x13FFF : 0x0FFFF # (u8 write only) upper limit depends on display mode
address = 0x1FFFE_u32 & index # (u8 write only) halfword-aligned
address -= 0x8000 if address > 0x17FFF # todo: determine if this happens before or after the limit check
(@gba.ppu.vram.to_unsafe + address).as(HalfWord*).value = 0x0101_u16 * value if address <= limit
when 0xD then @gba.storage[index] = value if @gba.storage.eeprom? index
when 0xE, 0xF then @gba.storage[index] = value
else log "Unmapped write: #{hex_str index.to_u32}"

4
src/crab/gba/ppu.cr
View file

@ -35,6 +35,10 @@ module GBA
start_line
end
def bitmap? : Bool
@dispcnt.bg_mode >= 3
end
def start_line : Nil
@gba.scheduler.schedule 960, ->start_hblank
end