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https://gitlab.com/xCrystal/pokecrystal-board.git
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123 lines
2.3 KiB
NASM
Executable File
123 lines
2.3 KiB
NASM
Executable File
OVERWORLD_HUD_HEIGHT EQU 8
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EnableOverworldHUD::
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ld a, HUD_OVERWORLD
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ld [wWhichHUD], a
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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 [hWindowHUDLY], a
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; configure LCD interrupt
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ldh [rLYC], 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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; configure LCD interrupt
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ld a, 1 << rSTAT_INT_LYC ; LYC=LY
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ldh [rSTAT], a
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ret
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DisableOverworldHUD::
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xor a
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ld [wWhichHUD], a
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; fallthrough
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DisableWindowHUD::
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xor a
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ldh [hWindowHUDLY], 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 (hidden with WY=$90)
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; rLCDC[rLCDC_WINDOW_ENABLE] will be set during next vblank
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ld a, $90
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ldh [hWY], a
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ret
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LoadWindowHUD::
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; like LoadHUD, but for HUDs that require a Window overlay
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ldh a, [hWindowHUDLY]
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and a
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ret z
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; fallthrough
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LoadHUD::
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; load the HUD at wWhichHUD to the top of wTilemap and wAttrmap
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ld a, [wWhichHUD]
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and a
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ret z
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farcall _LoadHUD
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ret
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ConstructOverworldHUDTilemap::
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; draw the overworld HUD's tilemap into wOverworldHUDTiles
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ld hl, .Tilemap
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ld de, wOverworldHUDTiles
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ld bc, .TilemapEnd - .Tilemap ; SCREEN_WIDTH
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call CopyBytes
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ret
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.Tilemap:
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db "▶- ▶- ▶ ▶ "
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.TilemapEnd:
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assert .TilemapEnd - .Tilemap == wOverworldHUDTilesEnd - wOverworldHUDTiles
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TransferOverworldHUDToBGMap::
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; transfer overworld HUD to vBGMap1/vBGMap3 during v/hblank(s)
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; tilemap is read from wOverworldHUDTiles, attrmap is all PAL_BG_TEXT | PRIORITY
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ldh a, [rVBK]
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push af
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; Tilemap
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ld a, BANK(vBGMap1)
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ldh [rVBK], a
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ld de, vBGMap1
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ld hl, wOverworldHUDTiles
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ld b, 1 << rSTAT_BUSY ; not in v/hblank
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ld c, LOW(rSTAT)
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rept SCREEN_WIDTH / 2
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; if not in v/hblank, wait until in v/hblank
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.loop\@
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ldh a, [c]
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and b
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jr nz, .loop\@
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; copy
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; we have at least a margin of 16 cycles of Mode2 left
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ld a, [hli]
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ld [de], a
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inc de
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ld a, [hli]
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ld [de], a
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inc de
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endr
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; Attrmap
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ld a, BANK(vBGMap3)
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ldh [rVBK], a
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ld hl, vBGMap3
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rept SCREEN_WIDTH / 5
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; if not in v/hblank, wait until in v/hblank
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.loop\@
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ldh a, [c]
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and b
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jr nz, .loop\@
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; fill
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; we have at least a margin of 16 cycles of Mode2 left
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ld a, PAL_BG_TEXT | PRIORITY
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ld [hli], a
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ld [hli], a
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ld [hli], a
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ld [hli], a
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ld [hli], a
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endr
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pop af
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ld [rVBK], a
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ret
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