diff options
| author | ElectroDeoxys <ElectroDeoxys@gmail.com> | 2021-02-18 15:21:26 +0000 |
|---|---|---|
| committer | ElectroDeoxys <ElectroDeoxys@gmail.com> | 2021-02-18 15:21:26 +0000 |
| commit | 5d5acff2cc44369fdd49905228b45d9aeeefb09f (patch) | |
| tree | fc7231a8577ce3e291f3b7f14c1beb9282c5e6a6 /src | |
| parent | d49e8a0db46c1e5289da1429f2218f1e0dbe9831 (diff) | |
Document bank20 routines
Diffstat (limited to 'src')
| -rw-r--r-- | src/engine/bank03.asm | 7 | ||||
| -rw-r--r-- | src/engine/bank20.asm | 25 |
2 files changed, 19 insertions, 13 deletions
diff --git a/src/engine/bank03.asm b/src/engine/bank03.asm index 345b345..c29f75a 100644 --- a/src/engine/bank03.asm +++ b/src/engine/bank03.asm @@ -605,11 +605,12 @@ Func_c41c: ; c41c (3:441c) ret Func_c430: ; c430 (3:4430) +; update wSCXBuffer push bc ld a, [wd237] sla a sla a - sla a + sla a ; *8 ld b, a ld a, [wSCXBuffer] cp $b1 @@ -622,10 +623,12 @@ Func_c430: ; c430 (3:4430) ld a, b .asm_c449 ld [wSCXBuffer], a + +; update wSCYBuffer ld a, [wd238] sla a sla a - sla a + sla a ; *8 ld b, a ld a, [wSCYBuffer] cp $b9 diff --git a/src/engine/bank20.asm b/src/engine/bank20.asm index ee7f304..231becf 100644 --- a/src/engine/bank20.asm +++ b/src/engine/bank20.asm @@ -5,7 +5,7 @@ Func_80000: ; 80000 (20:4000) call Func_8003d farcall LoadPermissionMap farcall Func_c9c7 - call Func_801a1 + call SafelyCopyBGMapFromSRAMToVRAM farcall Func_c3ff ld a, [wCurMap] cp OVERWORLD_MAP @@ -20,7 +20,7 @@ Func_80028: ; 80028 (20:4028) ld bc, $0000 call LoadTilemap_ToSRAM farcall Func_c9c7 - call Func_801a1 + call SafelyCopyBGMapFromSRAMToVRAM farcall Func_c3ee ret ; 0x8003d @@ -287,18 +287,21 @@ CopyBGDataToVRAMOrSRAM: ; 8016e (20:416e) pop hl ret -Func_801a1: ; 801a1 (20:41a1) +; safely copies $20 bytes at a time +; sBGMap0 -> v0BGMap0 +; sBGMap1 -> v0BGMap1 (if in CGB) +SafelyCopyBGMapFromSRAMToVRAM: ; 801a1 (20:41a1) push hl push bc push de ldh a, [hBankSRAM] push af - ld a, $1 + ld a, BANK("SRAM1") call BankswitchSRAM ld hl, sBGMap0 ld de, v0BGMap0 ld c, $20 -.asm_801b4 +.loop push bc push hl push de @@ -306,30 +309,30 @@ Func_801a1: ; 801a1 (20:41a1) call SafeCopyDataHLtoDE ld a, [wConsole] cp CONSOLE_CGB - jr nz, .asm_801d6 + jr nz, .skip_vram1 pop de pop hl push hl push de - ld bc, $0400 + ld bc, sBGMap1 - sBGMap0 ; $400 add hl, bc call BankswitchVRAM1 ld b, $20 call SafeCopyDataHLtoDE call BankswitchVRAM0 +.skip_vram1 -.asm_801d6 pop hl - ld de, $0020 + ld de, $20 add hl, de ld e, l ld d, h pop hl - ld bc, $0020 + ld bc, $20 add hl, bc pop bc dec c - jr nz, .asm_801b4 + jr nz, .loop pop af call BankswitchSRAM call DisableSRAM |