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-rw-r--r--constants.asm79
-rw-r--r--main.asm645
2 files changed, 670 insertions, 54 deletions
diff --git a/constants.asm b/constants.asm
index 8fab2fb9..e55e5a26 100644
--- a/constants.asm
+++ b/constants.asm
@@ -89,6 +89,9 @@ TX_RAM: MACRO
; wram locations
+; the tiles of the row or column to be redrawn by RedrawExposedScreenEdge
+W_SCREENEDGETILES EQU $CBFC
+
; coordinates of the position of the cursor for the top menu item (id 0)
W_TOPMENUITEMY EQU $CC24
W_TOPMENUITEMX EQU $CC25
@@ -742,20 +745,92 @@ H_DIVISOR EQU $FF99 ; 1 byte
H_QUOTIENT EQU $FF95 ; 4 bytes, big endian order
H_REMAINDER EQU $FF99 ; 1 byte
+; is automatic background transfer during V-blank enabled?
+; if nonzero, yes
+; if zero, no
+H_AUTOBGTRANSFERENABLED EQU $FFBA
+
+TRANSFERTOP EQU 0
+TRANSFERMIDDLE EQU 1
+TRANSFERBOTTOM EQU 2
+
+; 00 = top third of background
+; 01 = middle third of background
+; 02 = bottom third of background
+H_AUTOBGTRANSFERPORTION EQU $FFBB
+
+; the destination address of the automatic background transfer
+H_AUTOBGTRANSFERDEST EQU $FFBC ; 2 bytes
+
+; temporary storage for stack pointer during memory transfers that use pop
+; to increase speed
+H_SPTEMP EQU $FFBF ; 2 bytes
+
+; source address for VBlankCopyBgMap function
+; the first byte doubles as the byte that enabled the transfer.
+; if it is 0, the transfer is disabled
+; if it is not 0, the transfer is enabled
+; this means that XX00 is not a valid source address
+H_VBCOPYBGSRC EQU $FFC1 ; 2 bytes
+
+; destination address for VBlankCopyBgMap function
+H_VBCOPYBGDEST EQU $FFC3 ; 2 bytes
+
+; number of rows for VBlankCopyBgMap to copy
+H_VBCOPYBGNUMROWS EQU $FFC5
+
+; size of VBlankCopy transfer in 8-byte units
+H_VBCOPYSIZE EQU $FFC6
+
+; source address for VBlankCopy function
+H_VBCOPYSRC EQU $FFC7
+
+; destination address for VBlankCopy function
+H_VBCOPYDEST EQU $FFC9
+
+; size of source data for VBlankCopyDouble in 4-byte units
+H_VBCOPYDOUBLESIZE EQU $FFCB
+
+; source address for VBlankCopyDouble function
+H_VBCOPYDOUBLESRC EQU $FFCC
+
+; destination address for VBlankCopyDouble function
+H_VBCOPYDOUBLEDEST EQU $FFCE
+
+; controls whether a row or column of 2x2 tile blocks is redrawn in V-blank
+; 00 = no redraw
+; 01 = redraw column
+; 02 = redraw row
+H_SCREENEDGEREDRAW EQU $FFD0
+
+REDRAWCOL EQU 1
+REDRAWROW EQU 2
+
+H_SCREENEDGEREDRAWADDR EQU $FFD1
+
H_RAND1 EQU $FFD3
H_RAND2 EQU $FFD4
+H_FRAMECOUNTER EQU $FFD5 ; decremented every V-blank (used for delays)
+
+; V-blank sets this to 0 each time it runs.
+; So, by setting it to a nonzero value and waiting for it to become 0 again,
+; you can detect that the V-blank handler has run since then.
+H_VBLANKOCCURRED EQU $FFD6
+
H_WHOSETURN EQU $FFF3 ; 0 on player’s turn, 1 on enemy’s turn
; hardware registers, from the pandocs http://nocash.emubase.de/pandocs.htm
rJOYP EQU $FF00
rDIV EQU $FF04
rLCDC EQU $FF40
+rSCY EQU $FF42
+rSCX EQU $FF43
rBGP EQU $FF47
rOBP0 EQU $FF48
rOBP1 EQU $FF49
-rWX EQU $FF4A
-rWY EQU $FF4B
+rWY EQU $FF4A
+rWX EQU $FF4B
rIE EQU $FFFF
diff --git a/main.asm b/main.asm
index 2f00a0ea..7cc370f5 100644
--- a/main.asm
+++ b/main.asm
@@ -20,7 +20,7 @@ SECTION "rst38",HOME[$38]
; interrupts
SECTION "vblank",HOME[$40]
- jp $2024
+ jp VBlankHandler
SECTION "lcdc",HOME[$48]
db $FF
SECTION "timer",HOME[$50]
@@ -2139,18 +2139,19 @@ MoveTileBlockMapPointerNorth: ; E85
; the portion of the map that was newly exposed due to the player's movement
ScheduleNorthRowRedraw: ; E91
- ld hl,$c3a0
+ FuncCoord 0,0
+ ld hl,Coord
call ScheduleRowRedrawHelper
ld a,[$d526]
- ld [$ffd1],a
+ ld [H_SCREENEDGEREDRAWADDR],a
ld a,[$d527]
- ld [$ffd2],a
- ld a,$02
- ld [$ffd0],a
+ ld [H_SCREENEDGEREDRAWADDR + 1],a
+ ld a,REDRAWROW
+ ld [H_SCREENEDGEREDRAW],a
ret
ScheduleRowRedrawHelper: ; EA6
- ld de,$cbfc
+ ld de,W_SCREENEDGETILES
ld c,$28
.loop\@
ld a,[hli]
@@ -2161,8 +2162,9 @@ ScheduleRowRedrawHelper: ; EA6
ret
ScheduleSouthRowRedraw: ; EB2
- ld hl,$c4e0
- call $0ea6
+ FuncCoord 0,16
+ ld hl,Coord
+ call ScheduleRowRedrawHelper
ld a,[$d526]
ld l,a
ld a,[$d527]
@@ -2172,33 +2174,34 @@ ScheduleSouthRowRedraw: ; EB2
ld a,h
and a,$03
or a,$98
- ld [$ffd2],a
+ ld [H_SCREENEDGEREDRAWADDR + 1],a
ld a,l
- ld [$ffd1],a
- ld a,$02
- ld [$ffd0],a
+ ld [H_SCREENEDGEREDRAWADDR],a
+ ld a,REDRAWROW
+ ld [H_SCREENEDGEREDRAW],a
ret
ScheduleEastColumnRedraw: ; ED3
- ld hl,$c3b2
+ FuncCoord 18,0
+ ld hl,Coord
call ScheduleColumnRedrawHelper
ld a,[$d526]
ld c,a
and a,$e0
ld b,a
ld a,c
- add a,$12
+ add a,18
and a,$1f
or b
- ld [$ffd1],a
+ ld [H_SCREENEDGEREDRAWADDR],a
ld a,[$d527]
- ld [$ffd2],a
- ld a,$01
- ld [$ffd0],a
+ ld [H_SCREENEDGEREDRAWADDR + 1],a
+ ld a,REDRAWCOL
+ ld [H_SCREENEDGEREDRAW],a
ret
ScheduleColumnRedrawHelper: ; EF2
- ld de,$cbfc
+ ld de,W_SCREENEDGETILES
ld c,$12
.loop\@
ld a,[hli]
@@ -2207,7 +2210,7 @@ ScheduleColumnRedrawHelper: ; EF2
ld a,[hl]
ld [de],a
inc de
- ld a,$13
+ ld a,19
add l
ld l,a
jr nc,.noCarry\@
@@ -2218,14 +2221,15 @@ ScheduleColumnRedrawHelper: ; EF2
ret
ScheduleWestColumnRedraw: ; F08
- ld hl,$c3a0
+ FuncCoord 0,0
+ ld hl,Coord
call ScheduleColumnRedrawHelper
ld a,[$d526]
- ld [$ffd1],a
+ ld [H_SCREENEDGEREDRAWADDR],a
ld a,[$d527]
- ld [$ffd2],a
- ld a,$01
- ld [$ffd0],a
+ ld [H_SCREENEDGEREDRAWADDR + 1],a
+ ld a,REDRAWCOL
+ ld [H_SCREENEDGEREDRAW],a
ret
; function to write the tiles that make up a tile block to memory
@@ -3705,7 +3709,469 @@ ClearBgMap: ; 1CF0
jr nz,.loop\@
ret
-INCBIN "baserom.gbc",$1D01,$1F54 - $1D01
+; When the player takes a step, a row or column of 2x2 tile blocks at the edge
+; of the screen toward which they moved is exposed and has to be redrawn.
+; This function does the redrawing.
+RedrawExposedScreenEdge: ; 1D01
+ ld a,[H_SCREENEDGEREDRAW]
+ and a
+ ret z
+ ld b,a
+ xor a
+ ld [H_SCREENEDGEREDRAW],a
+ dec b
+ jr nz,.redrawRow\@
+.redrawColumn\@
+ ld hl,W_SCREENEDGETILES
+ ld a,[H_SCREENEDGEREDRAWADDR]
+ ld e,a
+ ld a,[H_SCREENEDGEREDRAWADDR + 1]
+ ld d,a
+ ld c,18 ; screen height
+.loop1\@
+ ld a,[hli]
+ ld [de],a
+ inc de
+ ld a,[hli]
+ ld [de],a
+ ld a,31
+ add e
+ ld e,a
+ jr nc,.noCarry\@
+ inc d
+.noCarry\@
+; the following 4 lines wrap us from bottom to top if necessary
+ ld a,d
+ and a,$03
+ or a,$98
+ ld d,a
+ dec c
+ jr nz,.loop1\@
+ xor a
+ ld [H_SCREENEDGEREDRAW],a
+ ret
+.redrawRow\@
+ ld hl,W_SCREENEDGETILES
+ ld a,[H_SCREENEDGEREDRAWADDR]
+ ld e,a
+ ld a,[H_SCREENEDGEREDRAWADDR + 1]
+ ld d,a
+ push de
+ call .drawHalf\@ ; draw upper half
+ pop de
+ ld a,32 ; width of VRAM background map
+ add e
+ ld e,a
+ ; draw lower half
+.drawHalf\@
+ ld c,10
+.loop2\@
+ ld a,[hli]
+ ld [de],a
+ inc de
+ ld a,[hli]
+ ld [de],a
+ ld a,e
+ inc a
+; the following 6 lines wrap us from the right edge to the left edge if necessary
+ and a,$1f
+ ld b,a
+ ld a,e
+ and a,$e0
+ or b
+ ld e,a
+ dec c
+ jr nz,.loop2\@
+ ret
+
+; This function automatically transfers tile number data from the tile map at
+; C3A0 to VRAM during V-blank. Note that it only transfers one third of the
+; background per V-blank. It cycles through which third it draws.
+; This transfer is turned off when walking around the map, but is turned
+; on when talking to sprites, battling, using menus, etc. This is because
+; the above function, RedrawExposedScreenEdge, is used when walking to
+; improve efficiency.
+AutoBgMapTransfer: ; 1D57
+ ld a,[H_AUTOBGTRANSFERENABLED]
+ and a
+ ret z
+ ld hl,[sp + 0]
+ ld a,h
+ ld [H_SPTEMP],a
+ ld a,l
+ ld [H_SPTEMP + 1],a ; save stack pinter
+ ld a,[H_AUTOBGTRANSFERPORTION]
+ and a
+ jr z,.transferTopThird\@
+ dec a
+ jr z,.transferMiddleThird\@
+.transferBottomThird\@
+ FuncCoord 0,12
+ ld hl,Coord
+ ld sp,hl
+ ld a,[H_AUTOBGTRANSFERDEST + 1]
+ ld h,a
+ ld a,[H_AUTOBGTRANSFERDEST]
+ ld l,a
+ ld de,(12 * 32)
+ add hl,de
+ xor a ; TRANSFERTOP
+ jr .doTransfer\@
+.transferTopThird\@
+ FuncCoord 0,0
+ ld hl,Coord
+ ld sp,hl
+ ld a,[H_AUTOBGTRANSFERDEST + 1]
+ ld h,a
+ ld a,[H_AUTOBGTRANSFERDEST]
+ ld l,a
+ ld a,TRANSFERMIDDLE
+ jr .doTransfer\@
+.transferMiddleThird\@
+ FuncCoord 0,6
+ ld hl,Coord
+ ld sp,hl
+ ld a,[H_AUTOBGTRANSFERDEST + 1]
+ ld h,a
+ ld a,[H_AUTOBGTRANSFERDEST]
+ ld l,a
+ ld de,(6 * 32)
+ add hl,de
+ ld a,TRANSFERBOTTOM
+.doTransfer\@
+ ld [H_AUTOBGTRANSFERPORTION],a ; store next portion
+ ld b,6
+
+; unrolled loop and using pop for speed
+TransferBgRows: ; 1D9E
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ ld a,13
+ add l
+ ld l,a
+ jr nc,.noCarry\@
+ inc h
+.noCarry\@
+ dec b
+ jr nz,TransferBgRows
+ ld a,[H_SPTEMP]
+ ld h,a
+ ld a,[H_SPTEMP + 1]
+ ld l,a
+ ld sp,hl ; restore stack pointer
+ ret
+
+; Copies [H_VBCOPYBGNUMROWS] rows from H_VBCOPYBGSRC to H_VBCOPYBGDEST.
+; If H_VBCOPYBGSRC is XX00, the transfer is disabled.
+VBlankCopyBgMap: ; 1DE1
+ ld a,[H_VBCOPYBGSRC] ; doubles as enabling byte
+ and a
+ ret z
+ ld hl,[sp + 0]
+ ld a,h
+ ld [H_SPTEMP],a
+ ld a,l
+ ld [H_SPTEMP + 1],a ; save stack pointer
+ ld a,[H_VBCOPYBGSRC]
+ ld l,a
+ ld a,[H_VBCOPYBGSRC + 1]
+ ld h,a
+ ld sp,hl
+ ld a,[H_VBCOPYBGDEST]
+ ld l,a
+ ld a,[H_VBCOPYBGDEST + 1]
+ ld h,a
+ ld a,[H_VBCOPYBGNUMROWS]
+ ld b,a
+ xor a
+ ld [H_VBCOPYBGSRC],a ; disable transfer so it doesn't continue next V-blank
+ jr TransferBgRows
+
+; This function copies ([H_VBCOPYDOUBLESIZE] * 4) source bytes
+; from H_VBCOPYDOUBLESRC to H_VBCOPYDOUBLEDEST.
+; It copies each source byte to the destination twice (next to each other).
+; The function updates the source and destination addresses, so the transfer
+; can be continued easily by repeatingly calling this function.
+VBlankCopyDouble: ; 1E02
+ ld a,[H_VBCOPYDOUBLESIZE]
+ and a ; are there any bytes to copy?
+ ret z
+ ld hl,[sp + 0]
+ ld a,h
+ ld [H_SPTEMP],a
+ ld a,l
+ ld [H_SPTEMP + 1],a ; save stack pointer
+ ld a,[H_VBCOPYDOUBLESRC]
+ ld l,a
+ ld a,[H_VBCOPYDOUBLESRC + 1]
+ ld h,a
+ ld sp,hl
+ ld a,[H_VBCOPYDOUBLEDEST]
+ ld l,a
+ ld a,[H_VBCOPYDOUBLEDEST + 1]
+ ld h,a
+ ld a,[H_VBCOPYDOUBLESIZE]
+ ld b,a
+ xor a
+ ld [H_VBCOPYDOUBLESIZE],a ; disable transfer so it doesn't continue next V-blank
+.loop\@
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ ld [hl],d
+ inc hl
+ dec b
+ jr nz,.loop\@
+ ld a,l
+ ld [H_VBCOPYDOUBLEDEST],a
+ ld a,h
+ ld [H_VBCOPYDOUBLEDEST + 1],a ; update destination address
+ ld hl,[sp + 0]
+ ld a,l
+ ld [H_VBCOPYDOUBLESRC],a
+ ld a,h
+ ld [H_VBCOPYDOUBLESRC + 1],a ; update source address
+ ld a,[H_SPTEMP]
+ ld h,a
+ ld a,[H_SPTEMP + 1]
+ ld l,a
+ ld sp,hl ; restore stack pointer
+ ret
+
+; Copies ([H_VBCOPYSIZE] * 8) bytes from H_VBCOPYSRC to H_VBCOPYDEST.
+; The function updates the source and destination addresses, so the transfer
+; can be continued easily by repeatingly calling this function.
+VBlankCopy: ; 1E5E
+ ld a,[H_VBCOPYSIZE]
+ and a ; are there any bytes to copy?
+ ret z
+ ld hl,[sp + 0]
+ ld a,h
+ ld [H_SPTEMP],a
+ ld a,l
+ ld [H_SPTEMP + 1],a ; save stack pointer
+ ld a,[H_VBCOPYSRC]
+ ld l,a
+ ld a,[H_VBCOPYSRC + 1]
+ ld h,a
+ ld sp,hl
+ ld a,[H_VBCOPYDEST]
+ ld l,a
+ ld a,[H_VBCOPYDEST + 1]
+ ld h,a
+ ld a,[H_VBCOPYSIZE]
+ ld b,a
+ xor a
+ ld [H_VBCOPYSIZE],a ; disable transfer so it doesn't continue next V-blank
+.loop\@
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc l
+ pop de
+ ld [hl],e
+ inc l
+ ld [hl],d
+ inc hl
+ dec b
+ jr nz,.loop\@
+ ld a,l
+ ld [H_VBCOPYDEST],a
+ ld a,h
+ ld [H_VBCOPYDEST + 1],a
+ ld hl,[sp + 0]
+ ld a,l
+ ld [H_VBCOPYSRC],a
+ ld a,h
+ ld [H_VBCOPYSRC + 1],a
+ ld a,[H_SPTEMP]
+ ld h,a
+ ld a,[H_SPTEMP + 1]
+ ld l,a
+ ld sp,hl ; restore stack pointer
+ ret
+
+; This function updates the moving water and flower background tiles.
+UpdateMovingBgTiles: ; 1EBE
+ ld a,[$ffd7]
+ and a
+ ret z
+ ld a,[$ffd8]
+ inc a
+ ld [$ffd8],a
+ cp a,20
+ ret c
+ cp a,21
+ jr z,.updateFlowerTile\@
+ ld hl,$9140 ; water tile pattern VRAM location
+ ld c,16 ; number of bytes in a tile pattern
+ ld a,[$d085]
+ inc a
+ and a,$07
+ ld [$d085],a
+ and a,$04
+ jr nz,.rotateWaterLeftLoop\@
+.rotateWaterRightloop\@
+ ld a,[hl]
+ rrca
+ ld [hli],a
+ dec c
+ jr nz,.rotateWaterRightloop\@
+ jr .done\@
+.rotateWaterLeftLoop\@
+ ld a,[hl]
+ rlca
+ ld [hli],a
+ dec c
+ jr nz,.rotateWaterLeftLoop\@
+.done\@
+ ld a,[$ffd7]
+ rrca
+ ret nc
+ xor a
+ ld [$ffd8],a
+ ret
+.updateFlowerTile\@
+ xor a
+ ld [$ffd8],a
+ ld a,[$d085]
+ and a,$03
+ cp a,2
+ ld hl,FlowerTilePattern1
+ jr c,.writeTilePatternToVram\@
+ ld hl,FlowerTilePattern2
+ jr z,.writeTilePatternToVram\@
+ ld hl,FlowerTilePattern3
+.writeTilePatternToVram\@
+ ld de,$9030 ; flower tile pattern VRAM location
+ ld c,16 ; number of bytes in a tile pattern
+.flowerTileLoop\@
+ ld a,[hli]
+ ld [de],a
+ inc de
+ dec c
+ jr nz,.flowerTileLoop\@
+ ret
+
+FlowerTilePattern1: ; 1F19
+INCBIN "baserom.gbc",$1f19,16
+
+FlowerTilePattern2: ; 1F29
+INCBIN "baserom.gbc",$1f29,16
+
+FlowerTilePattern3: ; 1F39
+INCBIN "baserom.gbc",$1f39,16
+
+INCBIN "baserom.gbc",$1F49,$1F54 - $1F49
; initialization code
; explanation for %11100011 (value stored in rLCDC)
@@ -3766,9 +4232,9 @@ InitGame: ; 1F54
ld [rIE],a
ld a,$90 ; put the window off the screen
ld [$ffb0],a
- ld [rWX],a
- ld a,$07
ld [rWY],a
+ ld a,$07
+ ld [rWX],a
ld a,$ff
ld [$ffaa],a
ld h,$98
@@ -3809,17 +4275,92 @@ ZeroVram: ; 2004
xor a
jp $36e0
-INCBIN "baserom.gbc",$200E,$20AF - $200E
+INCBIN "baserom.gbc",$200E,$2024 - $200E
+
+VBlankHandler: ; 2024
+ push af
+ push bc
+ push de
+ push hl
+ ld a,[$ffb8] ; current ROM bank
+ ld [$d122],a
+ ld a,[$ffae]
+ ld [rSCX],a
+ ld a,[$ffaf]
+ ld [rSCY],a
+ ld a,[$d0a0]
+ and a
+ jr nz,.doVramTransfers\@
+ ld a,[$ffb0]
+ ld [rWY],a
+.doVramTransfers\@
+ call AutoBgMapTransfer
+ call VBlankCopyBgMap
+ call RedrawExposedScreenEdge
+ call VBlankCopy
+ call VBlankCopyDouble
+ call UpdateMovingBgTiles
+ call $ff80 ; OAM DMA
+ ld a,$01
+ ld [$ffb8],a
+ ld [$2000],a
+ call $4b0f ; update OAM buffer with current sprite data
+ call GenRandom
+ ld a,[H_VBLANKOCCURRED]
+ and a
+ jr z,.next\@
+ xor a
+ ld [H_VBLANKOCCURRED],a
+.next\@
+ ld a,[H_FRAMECOUNTER]
+ and a
+ jr z,.handleMusic\@
+ dec a
+ ld [H_FRAMECOUNTER],a
+.handleMusic\@
+ call $28cb
+ ld a,[$c0ef] ; music ROM bank
+ ld [$ffb8],a
+ ld [$2000],a
+ cp a,$02
+ jr nz,.checkIfBank08\@
+.bank02\@
+ call $5103
+ jr .afterMusic\@
+.checkIfBank08\@
+ cp a,$08
+ jr nz,.bank1F\@
+.bank08\@
+ call $536e
+ call $5879
+ jr .afterMusic\@
+.bank1F\@
+ call $5177
+.afterMusic\@
+ ld b,$06
+ ld hl,$4dee
+ call Bankswitch ; keep track of time played
+ ld a,[$fff9]
+ and a
+ call z,ReadJoypadRegister
+ ld a,[$d122]
+ ld [$ffb8],a
+ ld [$2000],a
+ pop hl
+ pop de
+ pop bc
+ pop af
+ reti
DelayFrame: ; 20AF
; delay for one frame
ld a,1
- ld [$FFD6],a
+ ld [H_VBLANKOCCURRED],a
; wait for the next Vblank, halting to conserve battery
.halt\@
db $76 ; XXX this is a hack--rgbasm adds a nop after this instr even when ints are enabled
- ld a,[$FFD6]
+ ld a,[H_VBLANKOCCURRED]
and a
jr nz,.halt\@
@@ -4198,8 +4739,8 @@ DisplayTextID: ; 2920
ld a,[W_CURMAP]
call SwitchToMapRomBank
.skipSwitchToMapBank\@
- ld a,$1e
- ld [$ffd5],a ; joypad poll timer
+ ld a,30 ; half a second
+ ld [H_FRAMECOUNTER],a ; used as joypad poll timer
ld hl,W_MAPTEXTPTR
ld a,[hli]
ld h,[hl]
@@ -4796,10 +5337,10 @@ GetJoypadStateLowSensitivity: ; 3831
jr z,.noNewlyPressedButtons\@
.newlyPressedButtons\@
ld a,30 ; half a second delay
- ld [$ffd5],a ; frame counter
+ ld [H_FRAMECOUNTER],a
ret
.noNewlyPressedButtons\@
- ld a,[$ffd5] ; frame counter
+ ld a,[H_FRAMECOUNTER]
and a ; is the delay over?
jr z,.delayOver\@
.delayNotOver\@
@@ -4818,7 +5359,7 @@ GetJoypadStateLowSensitivity: ; 3831
ld [$ffb5],a
.setShortDelay\@
ld a,5 ; 1/12 of a second delay
- ld [$ffd5],a ; frame counter
+ ld [H_FRAMECOUNTER],a
ret
INCBIN "baserom.gbc",$3865,$38AC - $3865
@@ -4886,11 +5427,11 @@ PrintLetterDelay: ; 38D3
jr z,.waitOneFrame\@
ld a,[$d355]
and a,$0f
- ld [$ffd5],a ; frame counter
+ ld [H_FRAMECOUNTER],a
jr .checkButtons\@
.waitOneFrame\@
ld a,1
- ld [$ffd5],a ; frame counter
+ ld [H_FRAMECOUNTER],a
.checkButtons\@
call GetJoypadState
ld a,[$ffb4]
@@ -4905,7 +5446,7 @@ PrintLetterDelay: ; 38D3
call DelayFrame
jr .done\@
.buttonsNotPressed\@ ; if neither A nor B is pressed
- ld a,[$ffd5] ; frame counter
+ ld a,[H_FRAMECOUNTER]
and a
jr nz,.checkButtons\@
.done\@
@@ -12100,7 +12641,7 @@ ItemUseBall: ; 03:5687
ld [H_MULTIPLICAND + 2],a
ld a,255
ld [H_MULTIPLIER],a
- call $38ac ;Multiply: MaxHP * 255
+ call Multiply ; MaxHP * 255
ld a,[$cf91]
cp a,GREAT_BALL
ld a,12 ;any other BallFactor
@@ -12109,7 +12650,7 @@ ItemUseBall: ; 03:5687
.next7\@ ;$574d
ld [H_DIVISOR],a
ld b,4 ;number of significant bytes
- call $38b9 ;Divide
+ call Divide
ld hl,W_ENEMYMONCURHP
ld a,[hli]
ld b,a
@@ -12128,7 +12669,7 @@ ItemUseBall: ; 03:5687
.next8\@ ;$5766
ld [H_DIVISOR],a
ld b,4
- call $38b9 ; Divide: ((MaxHP * 255) / BallFactor) / (CurHP / 4)
+ call Divide ; ((MaxHP * 255) / BallFactor) / (CurHP / 4)
ld a,[H_QUOTIENT + 2]
and a
jr z,.next9\@
@@ -12159,7 +12700,7 @@ ItemUseBall: ; 03:5687
ld [H_MULTIPLICAND + 2],a
ld a,100
ld [H_MULTIPLIER],a
- call $38ac ;Multiply: CatchRate * 100
+ call Multiply ; CatchRate * 100
ld a,[$cf91]
ld b,255
cp a,POKE_BALL
@@ -12174,18 +12715,18 @@ ItemUseBall: ; 03:5687
ld a,b
ld [H_DIVISOR],a
ld b,4
- call $38b9 ;Divide
+ call Divide
ld a,[H_QUOTIENT + 2]
and a
ld b,$63
jr nz,.next12\@
ld a,[$d11e]
ld [H_MULTIPLIER],a
- call $38ac
+ call Multiply
ld a,255
ld [H_DIVISOR],a
ld b,4
- call $38b9
+ call Divide
ld a,[W_ENEMYMONSTATUS] ;status ailments
and a
jr z,.next13\@
@@ -22723,7 +23264,7 @@ Function67CF: ; 0x3a7cf 67CF
ld a,[hl]
ld [H_DIVIDEND + 1],a
ld b,2
- call $38B9
+ call Divide
ld a,[H_QUOTIENT + 3]
ld c,a
ld a,[H_QUOTIENT + 2]
@@ -26630,11 +27171,11 @@ AdjustDamageForMoveType: ; 63A5
ld [H_MULTIPLICAND + 1],a
ld a,[hld]
ld [H_MULTIPLICAND + 2],a
- call $38ac ; multiply
+ call Multiply
ld a,10
ld [H_DIVISOR],a
ld b,$04
- call $38b9 ; divide
+ call Divide
ld a,[H_QUOTIENT + 2]
ld [hli],a
ld b,a
@@ -26945,11 +27486,11 @@ CalcHitChance: ; 6624
pop bc
ld a,[hli]
ld [H_MULTIPLIER],a ; set multiplier to the numerator of the ratio
- call $38ac ; multiply
+ call Multiply
ld a,[hl]
ld [H_DIVISOR],a ; set divisor to the the denominator of the ratio (the dividend is the product of the previous multiplication)
ld b,$04 ; number of significant bytes in the dividend
- call $38b9 ; divide
+ call Divide
ld a,[H_QUOTIENT + 3]
ld b,a
ld a,[H_QUOTIENT + 2]
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-06 07:16:40 +0000