diff options
Diffstat (limited to 'engine')
| -rw-r--r-- | engine/flag_predef.asm | 70 | ||||
| -rw-r--r-- | engine/item_effects.asm | 1 |
2 files changed, 71 insertions, 0 deletions
diff --git a/engine/flag_predef.asm b/engine/flag_predef.asm new file mode 100644 index 000000000..bd4f37882 --- /dev/null +++ b/engine/flag_predef.asm @@ -0,0 +1,70 @@ +FlagPredef: ; 4d7c1 +; Perform action b on flag c in flag array hl. +; If checking a flag, check flag array d:hl unless d is 0. + +; For longer flag arrays, see FlagAction. + + push hl + push bc + +; Divide by 8 to get the byte we want. + push bc + srl c + srl c + srl c + ld b, 0 + add hl, bc + pop bc + +; Which bit we want from the byte + ld a, c + and 7 + ld c, a + +; Shift left until we can mask the bit + ld a, 1 + jr z, .shifted +.shift + add a + dec c + jr nz, .shift +.shifted + ld c, a + +; What are we doing to this flag? + dec b + jr z, .set ; 1 + dec b + jr z, .check ; 2 + +.reset + ld a, c + cpl + and [hl] + ld [hl], a + jr .done + +.set + ld a, [hl] + or c + ld [hl], a + jr .done + +.check + ld a, d + cp 0 + jr nz, .farcheck + + ld a, [hl] + and c + jr .done + +.farcheck + call GetFarByte + and c + +.done + pop bc + pop hl + ld c, a + ret diff --git a/engine/item_effects.asm b/engine/item_effects.asm index cc2132034..d1b5e7161 100644 --- a/engine/item_effects.asm +++ b/engine/item_effects.asm @@ -14,6 +14,7 @@ _DoItemEffect:: ; e722 ItemEffects: ; e73c +; entries correspond to item ids (see constants/item_constants.asm) dw MasterBall dw UltraBall dw Brightpowder |