mirror of
https://github.com/pret/pokered.git
synced 2024-10-24 15:27:10 +00:00
178 lines
2.8 KiB
NASM
178 lines
2.8 KiB
NASM
PrepareOAMData:
|
|
; Determine OAM data for currently visible
|
|
; sprites and write it to wOAMBuffer.
|
|
|
|
ld a, [wUpdateSpritesEnabled]
|
|
dec a
|
|
jr z, .asm_4b1e
|
|
|
|
cp 0 - 1
|
|
ret nz
|
|
ld [wUpdateSpritesEnabled], a
|
|
jp HideSprites
|
|
|
|
.asm_4b1e
|
|
xor a
|
|
ld [$ff90], a
|
|
.asm_4b21
|
|
ld [$ff8f], a
|
|
|
|
ld d, wSpriteStateData1 / $100
|
|
ld a, [$ff8f]
|
|
ld e, a
|
|
ld a, [de] ; c1x0
|
|
and a
|
|
jp z, .asm_4bad
|
|
|
|
inc e
|
|
inc e
|
|
ld a, [de] ; c1x2 (facing/anim)
|
|
ld [wd5cd], a
|
|
cp $ff ; off-screen (don't draw)
|
|
jr nz, .visible
|
|
|
|
call Func_4bd1
|
|
jr .asm_4bad
|
|
|
|
.visible
|
|
cp $a0
|
|
jr c, .usefacing
|
|
and $f
|
|
add $10
|
|
jr .asm_4b48
|
|
|
|
.usefacing
|
|
and $f
|
|
.asm_4b48
|
|
ld l, a
|
|
|
|
push de
|
|
inc d
|
|
ld a, e
|
|
add $5
|
|
ld e, a
|
|
ld a, [de] ; c2x7
|
|
and $80
|
|
ld [$ff94], a ; temp store sprite priority
|
|
pop de
|
|
|
|
ld h, 0
|
|
ld bc, SpriteFacingAndAnimationTable
|
|
add hl, hl
|
|
add hl, hl
|
|
add hl, bc
|
|
|
|
ld a, [hli]
|
|
ld c, a
|
|
ld a, [hli]
|
|
ld b, a
|
|
ld a, [hli]
|
|
ld h, [hl]
|
|
ld l, a
|
|
|
|
call Func_4bd1
|
|
|
|
ld a, [$ff90]
|
|
ld e, a
|
|
ld d, wOAMBuffer / $100
|
|
.tile
|
|
ld a, [$ff92] ; temp for sprite Y position
|
|
add $10 ; Y=16 is top of screen (Y=0 is invisible)
|
|
add [hl] ; add Y offset from table
|
|
ld [de], a ; write new sprite OAM Y position
|
|
inc hl
|
|
ld a, [$ff91] ; temp for sprite X position
|
|
add $8 ; X=8 is left of screen (X=0 is invisible)
|
|
add [hl] ; add X offset from table
|
|
inc e
|
|
ld [de], a ; write new sprite OAM X position
|
|
inc e
|
|
ld a, [bc] ; read pattern number offset (accomodates orientation (offset 0,4 or 8) and animation (offset 0 or $80))
|
|
inc bc
|
|
push bc
|
|
ld b, a
|
|
|
|
ld a, [wd5cd] ; temp copy of c1x2
|
|
swap a ; high nybble determines sprite used (0 is always player sprite, next are some npcs)
|
|
and $f
|
|
|
|
; Sprites $a and $b have one face (and therefore 4 tiles instead of 12).
|
|
; As a result, sprite $b's tile offset is less than normal.
|
|
cp $b
|
|
jr nz, .offset
|
|
ld a, $a * 12 + 4
|
|
jr .gotoffset
|
|
|
|
.offset
|
|
; a *= 12
|
|
sla a
|
|
sla a
|
|
ld c, a
|
|
sla a
|
|
add c
|
|
.gotoffset
|
|
add b ; which frame
|
|
pop bc
|
|
ld [de], a ; tile id
|
|
inc hl
|
|
inc e
|
|
ld a, [hl]
|
|
bit 1, a ; sprite priority
|
|
jr z, .fg
|
|
ld a, [$ff94] ; facing priority
|
|
or [hl]
|
|
.fg
|
|
inc hl
|
|
ld [de], a
|
|
inc e
|
|
bit 0, a ; OAMFLAG_ENDOFDATA
|
|
jr z, .tile
|
|
|
|
ld a, e
|
|
ld [$ff90], a
|
|
|
|
.asm_4bad
|
|
ld a, [$ff8f]
|
|
add $10
|
|
cp $100 % $100
|
|
jp nz, .asm_4b21
|
|
|
|
; Clear unused OAM.
|
|
ld a, [$ff90]
|
|
ld l, a
|
|
ld h, wOAMBuffer / $100
|
|
ld de, $4
|
|
ld b, $a0
|
|
ld a, [wd736]
|
|
bit 6, a
|
|
ld a, $a0
|
|
jr z, .clear
|
|
ld a, $90
|
|
.clear
|
|
cp l
|
|
ret z
|
|
ld [hl], b
|
|
add hl, de
|
|
jr .clear
|
|
|
|
Func_4bd1: ; 4bd1 (1:4bd1)
|
|
inc e
|
|
inc e
|
|
ld a, [de] ; c1x4
|
|
ld [$ff92], a
|
|
inc e
|
|
inc e
|
|
ld a, [de] ; c1x6
|
|
ld [$ff91], a
|
|
ld a, $4
|
|
add e
|
|
ld e, a
|
|
ld a, [$ff92]
|
|
add $4
|
|
and $f0
|
|
ld [de], a ; c1xa (y)
|
|
inc e
|
|
ld a, [$ff91]
|
|
and $f0
|
|
ld [de], a ; c1xb (x)
|
|
ret
|