diff options
Diffstat (limited to 'engine/battle/decrement_pp.asm')
| -rw-r--r-- | engine/battle/decrement_pp.asm | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/engine/battle/decrement_pp.asm b/engine/battle/decrement_pp.asm new file mode 100644 index 00000000..ecf5040b --- /dev/null +++ b/engine/battle/decrement_pp.asm @@ -0,0 +1,43 @@ +DecrementPP: ; 68000 (1a:4000) +; after using a move, decrement pp in battle and (if not transformed?) in party + ld a, [de] + cp a, STRUGGLE + ret z ; if the pokemon is using "struggle", there's nothing to do + ; we don't decrement PP for "struggle" + ld hl, W_PLAYERBATTSTATUS1 + ld a, [hli] ; load the W_PLAYERBATTSTATUS1 pokemon status flags and increment hl to load the + ; W_PLAYERBATTSTATUS2 status flags later + and a, (1 << StoringEnergy) | (1 << ThrashingAbout) | (1 << AttackingMultipleTimes) + ret nz ; if any of these statuses are true, don't decrement PP + bit UsingRage, [hl] + ret nz ; don't decrement PP either if Pokemon is using Rage + ld hl, wBattleMonPP ; PP of first move (in battle) + +; decrement PP in the battle struct + call .DecrementPP + +; decrement PP in the party struct + ld a, [W_PLAYERBATTSTATUS3] + bit Transformed, a + ret nz ; Return if transformed. Pokemon Red stores the "current pokemon's" PP + ; separately from the "Pokemon in your party's" PP. This is + ; duplication -- in all cases *other* than Pokemon with Transform. + ; Normally, this means we have to go on and make the same + ; modification to the "party's pokemon" PP that we made to the + ; "current pokemon's" PP. But, if we're dealing with a Transformed + ; Pokemon, it has separate PP for the move set that it copied from + ; its opponent, which is *not* the same as its real PP as part of your + ; party. So we return, and don't do that part. + + ld hl, wPartyMon1PP ; PP of first move (in party) + ld a, [wPlayerMonNumber] ; which mon in party is active + ld bc, wPartyMon2 - wPartyMon1 + call AddNTimes ; calculate address of the mon to modify +.DecrementPP + ld a, [wPlayerMoveListIndex] ; which move (0, 1, 2, 3) did we use? + ld c, a + ld b, 0 + add hl ,bc ; calculate the address in memory of the PP we need to decrement + ; based on the move chosen. + dec [hl] ; Decrement PP + ret |