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Implement the basics of the window HUD functionality (#15)
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@ -126,6 +126,8 @@ EnterMap:
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ld [wPoisonStepCount], a
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ld [wPoisonStepCount], a
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.dontresetpoison
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.dontresetpoison
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call EnableOverworldWindowHUD
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xor a ; end map entry
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xor a ; end map entry
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ldh [hMapEntryMethod], a
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ldh [hMapEntryMethod], a
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ld a, MAPSTATUS_HANDLE
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ld a, MAPSTATUS_HANDLE
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@ -1165,6 +1165,7 @@ Script_loadtrainer:
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ret
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ret
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Script_startbattle:
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Script_startbattle:
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call DisableWindowHUD
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call BufferScreen
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call BufferScreen
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predef StartBattle
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predef StartBattle
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ld a, [wBattleResult]
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ld a, [wBattleResult]
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20
home/lcd.asm
20
home/lcd.asm
@ -2,9 +2,12 @@
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LCD::
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LCD::
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push af
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push af
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; hLCDCPointer is used in battle transition, battle anims, and movies (crystal intro, credits, etc.)
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; uses rSTAT_INT_HBLANK and doesn't overlap with hWindowHUD.
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ldh a, [hLCDCPointer]
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ldh a, [hLCDCPointer]
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and a
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and a
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jr z, .done
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jr z, .next
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; At this point it's assumed we're in BANK(wLYOverrides)!
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; At this point it's assumed we're in BANK(wLYOverrides)!
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push bc
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push bc
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@ -19,6 +22,21 @@ LCD::
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ldh [c], a
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ldh [c], a
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pop bc
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pop bc
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.next
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; hWindowHUD uses rSTAT_INT_LYC
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ldh a, [hWindowHUD]
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and a
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jr z, .done
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; disable window for the remainder of the frame
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.wait_hblank
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ldh a, [rSTAT]
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and rSTAT_STATUS_FLAGS
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jr nz, .wait_hblank
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ldh a, [rLCDC]
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res rLCDC_WINDOW_ENABLE, a
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ldh [rLCDC], a
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.done
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.done
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pop af
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pop af
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reti
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reti
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@ -62,22 +62,22 @@ VBlank0::
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ld hl, hVBlankCounter
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ld hl, hVBlankCounter
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inc [hl]
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inc [hl]
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; advance random variables
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ldh a, [rDIV]
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ld b, a
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ldh a, [hRandomAdd]
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adc b
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ldh [hRandomAdd], a
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ldh a, [rDIV]
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ld b, a
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ldh a, [hRandomSub]
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sbc b
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ldh [hRandomSub], a
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ldh a, [hROMBank]
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ldh a, [hROMBank]
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ldh [hROMBankBackup], a
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ldh [hROMBankBackup], a
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; enable window back in case LCD interrupt disabled it mid-frame due to hWindowHUD
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ldh a, [rLCDC]
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set rLCDC_WINDOW_ENABLE, a
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ldh [rLCDC], a
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ld a, [hWindowHUD]
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and a
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jr z, .next
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xor a
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ldh [hWY], a
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.next
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ldh a, [hSCX]
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ldh a, [hSCX]
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ldh [rSCX], a
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ldh [rSCX], a
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ldh a, [hSCY]
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ldh a, [hSCY]
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@ -117,6 +117,30 @@ VBlank0::
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xor a
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xor a
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ld [wVBlankOccurred], a
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ld [wVBlankOccurred], a
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; if hWindowHUD is active, enable interrupts so the LCD interrupt can trigger
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ldh a, [hWindowHUD]
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and a
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jr z, .next2
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; enable lcd stat
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ld a, 1 << LCD_STAT
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ldh [rIE], a
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ei
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.next2
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; advance random variables
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ldh a, [rDIV]
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ld b, a
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ldh a, [hRandomAdd]
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adc b
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ldh [hRandomAdd], a
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ldh a, [rDIV]
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ld b, a
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ldh a, [hRandomSub]
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sbc b
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ldh [hRandomSub], a
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ld a, [wOverworldDelay]
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ld a, [wOverworldDelay]
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and a
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and a
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jr z, .ok
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jr z, .ok
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@ -139,6 +163,26 @@ VBlank0::
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ldh a, [hROMBankBackup]
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ldh a, [hROMBankBackup]
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rst Bankswitch
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rst Bankswitch
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; if hWindowHUD is not active, we're done
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ldh a, [hWindowHUD]
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and a
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ret z
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; interrupts must be enabled in the cycle that rLY becomes [hWindowHUD] to prevent flickering
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; wait until [hWindowHUD] - [rLY] is NOT between 0 and 2 before disabling interrupts
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.wait_loop
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ldh a, [rLY]
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ld b, a
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ldh a, [hWindowHUD]
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sub b
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cp 2 + 1
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jr c, .wait_loop
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; restore normal interrupts: enable ints besides joypad and let vblank finish
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di
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ld a, IE_DEFAULT
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ldh [rIE], a
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ret
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ret
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VBlank2::
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VBlank2::
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@ -108,3 +108,36 @@ SafeUpdateSprites::
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pop af
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pop af
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ldh [hOAMUpdate], a
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ldh [hOAMUpdate], a
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ret
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ret
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OVERWORLD_HUD_HEIGHT EQU 8
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EnableOverworldWindowHUD::
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ld a, OVERWORLD_HUD_HEIGHT - 1
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; fallthrough
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EnableWindowHUD:
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ldh [hWindowHUD], a
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; configure LCD interrupt
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ldh [rLYC], a
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ld a, 1 << rSTAT_INT_LYC ; LYC=LC
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ldh [rSTAT], a
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; make window hidden this frame to prevent graphical glitches
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ld a, $90
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ldh [hWY], a
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ret
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DisableWindowHUD::
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xor a
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ldh [hWindowHUD], a
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; configure LCD interrupt
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xor a
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ldh [rLYC], a
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ld a, 1 << rSTAT_INT_HBLANK ; hblank (default)
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ldh [rSTAT], a
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; leave window in default state (enabled and hidden)
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ld a, $90
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ldh [hWY], a
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ldh a, [rLCDC]
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set rLCDC_WINDOW_ENABLE, a
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ldh [rLCDC], a
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ret
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@ -145,5 +145,10 @@ hDMATransfer:: db
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hSystemBooted:: db
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hSystemBooted:: db
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if DEF(_DEBUG)
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if DEF(_DEBUG)
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hDebugRoomMenuPage::
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hDebugRoomMenuPage:: db
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endc
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endc
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hWindowHUD::
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; Window HUD is enabled when non-0.
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; Its value indicates the last scanline that the window spans from the top.
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db
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