diff options
Diffstat (limited to 'engine/overworld/oam.asm')
-rw-r--r-- | engine/overworld/oam.asm | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/engine/overworld/oam.asm b/engine/overworld/oam.asm deleted file mode 100644 index 68128413..00000000 --- a/engine/overworld/oam.asm +++ /dev/null @@ -1,189 +0,0 @@ -PrepareOAMData:: -; Determine OAM data for currently visible -; sprites and write it to wOAMBuffer. - - ld a, [wUpdateSpritesEnabled] - dec a - jr z, .updateEnabled - - cp -1 - ret nz - ld [wUpdateSpritesEnabled], a - jp HideSprites - -.updateEnabled - xor a - ld [hOAMBufferOffset], a - -.spriteLoop - ld [hSpriteOffset2], a - - ld d, wSpriteStateData1 / $100 - ld a, [hSpriteOffset2] - ld e, a - ld a, [de] ; c1x0 - and a - jp z, .nextSprite - - inc e - inc e - ld a, [de] ; c1x2 (facing/anim) - ld [wd5cd], a - cp $ff ; off-screen (don't draw) - jr nz, .visible - - call GetSpriteScreenXY - jr .nextSprite - -.visible - cp $a0 ; is the sprite unchanging like an item ball or boulder? - jr c, .usefacing - -; unchanging - and $f - add $10 ; skip to the second half of the table which doesn't account for facing direction - jr .next - -.usefacing - and $f - -.next - ld l, a - -; get sprite priority - push de - inc d - ld a, e - add $5 - ld e, a - ld a, [de] ; c2x7 - and $80 - ld [hSpritePriority], a ; temp store sprite priority - pop de - -; read the entry from the table - 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 GetSpriteScreenXY - - ld a, [hOAMBufferOffset] - ld e, a - ld d, wOAMBuffer / $100 - -.tileLoop - ld a, [hSpriteScreenY] ; 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, [hSpriteScreenX] ; 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 (accommodates 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, .notFourTileSprite - ld a, $a * 12 + 4 - jr .next2 - -.notFourTileSprite - ; a *= 12 - sla a - sla a - ld c, a - sla a - add c - -.next2 - add b ; add the tile offset from the table (based on frame and facing direction) - pop bc - ld [de], a ; tile id - inc hl - inc e - ld a, [hl] - bit 1, a ; is the tile allowed to set the sprite priority bit? - jr z, .skipPriority - ld a, [hSpritePriority] - or [hl] -.skipPriority - inc hl - ld [de], a - inc e - bit 0, a ; OAMFLAG_ENDOFDATA - jr z, .tileLoop - - ld a, e - ld [hOAMBufferOffset], a - -.nextSprite - ld a, [hSpriteOffset2] - add $10 - cp $100 % $100 - jp nz, .spriteLoop - - ; Clear unused OAM. - ld a, [hOAMBufferOffset] - ld l, a - ld h, wOAMBuffer / $100 - ld de, $4 - ld b, $a0 - ld a, [wd736] - bit 6, a ; jumping down ledge or fishing animation? - ld a, $a0 - jr z, .clear - -; Don't clear the last 4 entries because they are used for the shadow in the -; jumping down ledge animation and the rod in the fishing animation. - ld a, $90 - -.clear - cp l - ret z - ld [hl], b - add hl, de - jr .clear - -GetSpriteScreenXY: - inc e - inc e - ld a, [de] ; c1x4 - ld [hSpriteScreenY], a - inc e - inc e - ld a, [de] ; c1x6 - ld [hSpriteScreenX], a - ld a, 4 - add e - ld e, a - ld a, [hSpriteScreenY] - add 4 - and $f0 - ld [de], a ; c1xa (y) - inc e - ld a, [hSpriteScreenX] - and $f0 - ld [de], a ; c1xb (x) - ret |