diff options
Diffstat (limited to 'engine')
| -rwxr-xr-x | engine/billspctop.asm | 388 | ||||
| -rwxr-xr-x | engine/health.asm | 110 | ||||
| -rwxr-xr-x | engine/items.asm | 584 | ||||
| -rw-r--r-- | engine/phone.asm | 11 | ||||
| -rwxr-xr-x | engine/player_object.asm | 856 | ||||
| -rwxr-xr-x | engine/printnum.asm | 300 | ||||
| -rwxr-xr-x | engine/sine.asm | 50 |
7 files changed, 2292 insertions, 7 deletions
diff --git a/engine/billspctop.asm b/engine/billspctop.asm new file mode 100755 index 000000000..038341ccc --- /dev/null +++ b/engine/billspctop.asm @@ -0,0 +1,388 @@ +_BillsPC: ; e3fd + call .CheckCanUsePC + ret c + call .LogIn + call .UseBillsPC + jp .LogOut + +.CheckCanUsePC: ; e40a (3:640a) + ld a, [PartyCount] + and a + ret nz + ld hl, .Text_GottaHavePokemon + call MenuTextBoxBackup + scf + ret + +.Text_GottaHavePokemon: ; 0xe417 + ; You gotta have #MON to call! + text_jump UnknownText_0x1c1006 + db "@" + +.LogIn: ; e41c (3:641c) + xor a + ld [hBGMapMode], a + call LoadStandardMenuDataHeader + call ClearPCItemScreen + ld hl, Options + ld a, [hl] + push af + set NO_TEXT_SCROLL, [hl] + ld hl, .Text_What + call PrintText + pop af + ld [Options], a + call LoadFontsBattleExtra + ret + +.Text_What: ; 0xe43a + ; What? + text_jump UnknownText_0x1c1024 + db "@" + +.LogOut: ; e43f (3:643f) + call CloseSubmenu + ret + +.UseBillsPC: ; e443 (3:6443) + ld hl, .MenuDataHeader + call LoadMenuDataHeader + ld a, $1 +.loop + ld [wMenuCursorBuffer], a + call SetPalettes + xor a + ld [wWhichIndexSet], a + ld [hBGMapMode], a + call DoNthMenu + jr c, .cancel + ld a, [wMenuCursorBuffer] + push af + ld a, [MenuSelection] + ld hl, .Jumptable + rst JumpTable + pop bc + ld a, b + jr nc, .loop +.cancel + call CloseWindow + ret + +.MenuDataHeader: ; 0xe46f + db $40 ; flags + db 00, 00 ; start coords + db 17, 19 ; end coords + dw .MenuData2 + db 1 ; default option + +.MenuData2: ; 0xe477 + db $80 ; flags + db 0 ; items + dw .items + dw PlaceMenuStrings + dw .strings + +.strings: ; e47f + db "WITHDRAW <PK><MN>@" + db "DEPOSIT <PK><MN>@" + db "CHANGE BOX@" + db "MOVE <PK><MN> W/O MAIL@" + db "SEE YA!@" + +.Jumptable: ; e4ba (3:64ba) + dw BillsPC_WithdrawMenu + dw BillsPC_DepositMenu + dw BillsPC_ChangeBoxMenu + dw BillsPC_MovePKMNMenu + dw BillsPC_SeeYa + +.items: ; e4c4 + db 5 + db 0 ; WITHDRAW + db 1; DEPOSIT + db 2 ; CHANGE BOX + db 3 ; MOVE PKMN + db 4 ; SEE YA! + db -1 + +BillsPC_SeeYa: ; e4cb + scf + ret + +BillsPC_MovePKMNMenu: ; e4cd + call LoadStandardMenuDataHeader + callba IsAnyMonHoldingMail + jr nc, .no_mail + ld hl, .Text_MonHoldingMail + call PrintText + jr .quit + +.no_mail + callba StartMovePkmnWOMail_SaveGame + jr c, .quit + callba _MovePKMNWithoutMail + call ReturnToMapFromSubmenu + call ClearPCItemScreen + +.quit + call CloseWindow + and a + ret + +.Text_MonHoldingMail: ; 0xe4f9 + ; There is a #MON holding MAIL. Please remove the MAIL. + text_jump UnknownText_0x1c102b + db "@" + +BillsPC_DepositMenu: ; e4fe (3:64fe) + call LoadStandardMenuDataHeader + callba _DepositPKMN + call ReturnToMapFromSubmenu + call ClearPCItemScreen + call CloseWindow + and a + ret + +Functione512: ; unused + ld a, [PartyCount] + and a + jr z, .no_pkmn + cp 2 + jr c, .only_one_pkmn + and a + ret + +.no_pkmn + ld hl, .Text_NoPKMN + call MenuTextBoxBackup + scf + ret + +.only_one_pkmn + ld hl, .Text_ItsYourLastPKMN + call MenuTextBoxBackup + scf + ret + +.Text_NoPKMN: ; 0xe52e + ; You don't have a single #MON! + text_jump UnknownText_0x1c1062 + db "@" + +.Text_ItsYourLastPKMN: ; 0xe533 + ; You can't deposit your last #MON! + text_jump UnknownText_0x1c1080 + db "@" + +CheckCurPartyMonFainted: ; e538 + ld hl, PartyMon1HP + ld de, PARTYMON_STRUCT_LENGTH + ld b, $0 +.loop + ld a, [CurPartyMon] + cp b + jr z, .skip + ld a, [hli] + or [hl] + jr nz, .notfainted + dec hl + +.skip + inc b + ld a, [PartyCount] + cp b + jr z, .done + add hl, de + jr .loop + +.done + scf + ret + +.notfainted + and a + ret + +BillsPC_WithdrawMenu: ; e559 (3:6559) + call LoadStandardMenuDataHeader + callba _WithdrawPKMN + call ReturnToMapFromSubmenu + call ClearPCItemScreen + call CloseWindow + and a + ret + +Functione56d: ; unused + ld a, [PartyCount] + cp PARTY_LENGTH + jr nc, .asm_e576 + and a + ret + +.asm_e576 + ld hl, UnknownText_0xe57e + call MenuTextBoxBackup + scf + ret + +UnknownText_0xe57e: ; 0xe57e + ; You can't take any more #MON. + text_jump UnknownText_0x1c10a2 + db "@" + +BillsPC_ChangeBoxMenu: ; e583 (3:6583) + callba _ChangeBox + and a + ret + +ClearPCItemScreen: ; e58b + call DisableSpriteUpdates + xor a + ld [hBGMapMode], a + call ClearBGPalettes + call ClearSprites + hlcoord 0, 0 + ld bc, SCREEN_HEIGHT * SCREEN_WIDTH + ld a, " " + call ByteFill + hlcoord 0,0 + lb bc, 10, 18 + call TextBox + hlcoord 0,12 + lb bc, 4, 18 + call TextBox + call WaitBGMap2 + call SetPalettes ; load regular palettes? + ret + +CopyBoxmonToTempMon: ; e5bb + ld a, [CurPartyMon] + ld hl, sBoxMon1Species + ld bc, BOXMON_STRUCT_LENGTH + call AddNTimes + ld de, TempMonSpecies + ld bc, BOXMON_STRUCT_LENGTH + ld a, BANK(sBoxMon1Species) + call GetSRAMBank + call CopyBytes + call CloseSRAM + ret + +Functione5d9: ; unreferenced + ld a, [wCurBox] + cp b + jr z, .same_box + ld a, b + ld hl, .BoxAddrs + ld bc, 3 + call AddNTimes + ld a, [hli] + push af + ld a, [hli] + ld h, [hl] + ld l, a + pop af + jr .okay + +.same_box + ld a, BANK(sBoxCount) + ld hl, sBoxCount + +.okay + call GetSRAMBank + ld a, [hl] + ld bc, 1 + MONS_PER_BOX + 1 + add hl, bc + ld b, a + ld c, $0 + ld de, wc608 + ld a, b + and a + jr z, .empty_box +.loop + push hl + push bc + ld a, c + ld bc, 0 + add hl, bc + ld bc, BOXMON_STRUCT_LENGTH + call AddNTimes + ld a, [hl] + ld [de], a + inc de + ld [CurSpecies], a + call GetBaseData + pop bc + pop hl + + push hl + push bc + ld a, c + ld bc, MONS_PER_BOX * (BOXMON_STRUCT_LENGTH + NAME_LENGTH) + add hl, bc + call SkipNames + call CopyBytes + pop bc + pop hl + + push hl + push bc + ld a, c + ld bc, MON_LEVEL + add hl, bc + ld bc, BOXMON_STRUCT_LENGTH + call AddNTimes + ld a, [hl] + ld [de], a + inc de + pop bc + pop hl + + push hl + push bc + ld a, c + ld bc, MON_DVS + add hl, bc + ld bc, BOXMON_STRUCT_LENGTH + call AddNTimes + ld a, [hli] + and $f0 + ld b, a + ld a, [hl] + and $f0 + swap a + or b + ld b, a + ld a, [BaseGender] + cp b + ld a, $1 + jr c, .okay2 + xor a +.okay2 + ld [de], a + inc de + pop bc + pop hl + + inc c + dec b + jr nz, .loop +.empty_box + call CloseSRAM + ret + +.BoxAddrs: ; e66e + dba sBox1 + dba sBox2 + dba sBox3 + dba sBox4 + dba sBox5 + dba sBox6 + dba sBox7 + dba sBox8 + dba sBox9 + dba sBox10 + dba sBox11 + dba sBox12 + dba sBox13 + dba sBox14 diff --git a/engine/health.asm b/engine/health.asm new file mode 100755 index 000000000..1c926f677 --- /dev/null +++ b/engine/health.asm @@ -0,0 +1,110 @@ +HealParty: ; c658 + xor a + ld [CurPartyMon], a + ld hl, PartySpecies +.loop + ld a, [hli] + cp -1 + jr z, .done + cp EGG + jr z, .next + + push hl + call HealPartyMon + pop hl + +.next + ld a, [CurPartyMon] + inc a + ld [CurPartyMon], a + jr .loop + +.done + ret + +HealPartyMon: ; c677 + ld a, MON_SPECIES + call GetPartyParamLocation + ld d, h + ld e, l + + ld hl, MON_STATUS + add hl, de + xor a + ld [hli], a + ld [hl], a + + ld hl, MON_MAXHP + add hl, de + + ; bc = MON_HP + ld b, h + ld c, l + dec bc + dec bc + + ld a, [hli] + ld [bc], a + inc bc + ld a, [hl] + ld [bc], a + + callba RestoreAllPP + ret + +ComputeHPBarPixels: ; c699 +; e = bc * (6 * 8) / de + ld a, b + or c + jr z, .zero + push hl + xor a + ld [hMultiplicand + 0], a + ld a, b + ld [hMultiplicand + 1], a + ld a, c + ld [hMultiplicand + 2], a + ld a, 6 * 8 + ld [hMultiplier], a + call Multiply + ; We need de to be under 256 because hDivisor is only 1 byte. + ld a, d + and a + jr z, .divide + ; divide de and hProduct by 4 + srl d + rr e + srl d + rr e + ld a, [hProduct + 2] + ld b, a + ld a, [hProduct + 3] + srl b + rr a + srl b + rr a + ld [hDividend + 3], a + ld a, b + ld [hDividend + 2], a +.divide + ld a, e + ld [hDivisor], a + ld b, 4 + call Divide + ld a, [hQuotient + 2] + ld e, a + pop hl + and a + ret nz + ld e, 1 + ret + +.zero + ld e, 0 + ret + +AnimateHPBar: ; c6e0 + call WaitBGMap + call _AnimateHPBar + call WaitBGMap + ret diff --git a/engine/items.asm b/engine/items.asm new file mode 100755 index 000000000..ede8e4f73 --- /dev/null +++ b/engine/items.asm @@ -0,0 +1,584 @@ +_ReceiveItem:: ; d1d5 + call DoesHLEqualNumItems + jp nz, PutItemInPocket + push hl + call CheckItemPocket + pop de + ld a, [wItemAttributeParamBuffer] + dec a + ld hl, .Pockets + rst JumpTable + ret + +.Pockets: ; d1e9 + dw .Item + dw .KeyItem + dw .Ball + dw .TMHM + +.Item: ; d1f1 + ld h, d + ld l, e + jp PutItemInPocket + +.KeyItem: ; d1f6 + ld h, d + ld l, e + jp ReceiveKeyItem + +.Ball: ; d1fb + ld hl, NumBalls + jp PutItemInPocket + +.TMHM: ; d201 + ld h, d + ld l, e + ld a, [CurItem] + ld c, a + call GetTMHMNumber + jp ReceiveTMHM + +_TossItem:: ; d20d + call DoesHLEqualNumItems + jr nz, .remove + push hl + call CheckItemPocket + pop de + ld a, [wItemAttributeParamBuffer] + dec a + ld hl, .Pockets + rst JumpTable + ret + +.Pockets + dw .Item + dw .KeyItem + dw .Ball + dw .TMHM + +.Ball ; d228 + ld hl, NumBalls + jp RemoveItemFromPocket + +.TMHM ; d22e + ld h, d + ld l, e + ld a, [CurItem] + ld c, a + call GetTMHMNumber + jp TossTMHM + +.KeyItem ; d23a + ld h, d + ld l, e + jp TossKeyItem + +.Item ; d23f + ld h, d + ld l, e + +.remove + jp RemoveItemFromPocket + +_CheckItem:: ; d244 + call DoesHLEqualNumItems + jr nz, .nope + push hl + call CheckItemPocket + pop de + ld a, [wItemAttributeParamBuffer] + dec a + ld hl, .Pockets + rst JumpTable + ret + +.Pockets + dw .Item + dw .KeyItem + dw .Ball + dw .TMHM + +.Ball ; d25f + ld hl, NumBalls + jp CheckTheItem + +.TMHM ; d265 + ld h, d + ld l, e + ld a, [CurItem] + ld c, a + call GetTMHMNumber + jp CheckTMHM + +.KeyItem ; d271 + ld h, d + ld l, e + jp CheckKeyItems + +.Item ; d276 + ld h, d + ld l, e + +.nope + jp CheckTheItem + +DoesHLEqualNumItems: ; d27b + ld a, l + cp NumItems % $100 + ret nz + ld a, h + cp NumItems / $100 + ret + +GetPocketCapacity: ; d283 + ld c, MAX_ITEMS + ld a, e + cp NumItems % $100 + jr nz, .not_bag + ld a, d + cp NumItems / $100 + ret z + +.not_bag + ld c, MAX_PC_ITEMS + ld a, e + cp PCItems % $100 + jr nz, .not_pc + ld a, d + cp PCItems / $100 + ret z + +.not_pc + ld c, MAX_BALLS + ret + +PutItemInPocket: ; d29c + ld d, h + ld e, l + inc hl + ld a, [CurItem] + ld c, a + ld b, 0 +.loop + ld a, [hli] + cp -1 + jr z, .terminator + cp c + jr nz, .next + ld a, 99 + sub [hl] + add b + ld b, a + ld a, [wItemQuantityChangeBuffer] + cp b + jr z, .ok + jr c, .ok + +.next + inc hl + jr .loop + +.terminator + call GetPocketCapacity + ld a, [de] + cp c + jr c, .ok + and a + ret + +.ok + ld h, d + ld l, e + ld a, [CurItem] + ld c, a + ld a, [wItemQuantityChangeBuffer] + ld [wItemQuantityBuffer], a +.loop2 + inc hl + ld a, [hli] + cp -1 + jr z, .terminator2 + cp c + jr nz, .loop2 + ld a, [wItemQuantityBuffer] + add [hl] + cp 100 + jr nc, .newstack + ld [hl], a + jr .done + +.newstack + ld [hl], 99 + sub 99 + ld [wItemQuantityBuffer], a + jr .loop2 + +.terminator2 + dec hl + ld a, [CurItem] + ld [hli], a + ld a, [wItemQuantityBuffer] + ld [hli], a + ld [hl], -1 + ld h, d + ld l, e + inc [hl] + +.done + scf + ret + +RemoveItemFromPocket: ; d2ff + ld d, h + ld e, l + ld a, [hli] + ld c, a + ld a, [CurItemQuantity] + cp c + jr nc, .ok ; memory + ld c, a + ld b, $0 + add hl, bc + add hl, bc + ld a, [CurItem] + cp [hl] + inc hl + jr z, .skip + ld h, d + ld l, e + inc hl + +.ok + ld a, [CurItem] + ld b, a +.loop + ld a, [hli] + cp b + jr z, .skip + cp -1 + jr z, .nope + inc hl + jr .loop + +.skip + ld a, [wItemQuantityChangeBuffer] + ld b, a + ld a, [hl] + sub b + jr c, .nope + ld [hl], a + ld [wItemQuantityBuffer], a + and a + jr nz, .yup + dec hl + ld b, h + ld c, l + inc hl + inc hl +.loop2 + ld a, [hli] + ld [bc], a + inc bc + cp -1 + jr nz, .loop2 + ld h, d + ld l, e + dec [hl] + +.yup + scf + ret + +.nope + and a + ret + +CheckTheItem: ; d349 + ld a, [CurItem] + ld c, a +.loop + inc hl + ld a, [hli] + cp -1 + jr z, .done + cp c + jr nz, .loop + scf + ret + +.done + and a + ret + +ReceiveKeyItem: ; d35a + ld hl, NumKeyItems + ld a, [hli] + cp MAX_KEY_ITEMS + jr nc, .nope + ld c, a + ld b, 0 + add hl, bc + ld a, [CurItem] + ld [hli], a + ld [hl], -1 + ld hl, NumKeyItems + inc [hl] + scf + ret + +.nope + and a + ret + +TossKeyItem: ; d374 + ld a, [wd107] + ld e, a + ld d, 0 + ld hl, NumKeyItems + ld a, [hl] + cp e + jr nc, .ok + call .Toss + ret nc + jr .ok2 + +.ok + dec [hl] + inc hl + add hl, de + +.ok2 + ld d, h + ld e, l + inc hl +.loop + ld a, [hli] + ld [de], a + inc de + cp -1 + jr nz, .loop + scf + ret + +.Toss: ; d396 + ld hl, NumKeyItems + ld a, [CurItem] + ld c, a +.loop3 + inc hl + ld a, [hl] + cp c + jr z, .ok3 + cp -1 + jr nz, .loop3 + xor a + ret + +.ok3 + ld a, [NumKeyItems] + dec a + ld [NumKeyItems], a + scf + ret + +CheckKeyItems: ; d3b1 + ld a, [CurItem] + ld c, a + ld hl, KeyItems +.loop + ld a, [hli] + cp c + jr z, .done + cp -1 + jr nz, .loop + and a + ret + +.done + scf + ret + +ReceiveTMHM: ; d3c4 + dec c + ld b, 0 + ld hl, TMsHMs + add hl, bc + ld a, [wItemQuantityChangeBuffer] + add [hl] + cp 100 + jr nc, .toomany + ld [hl], a + scf + ret + +.toomany + and a + ret + +TossTMHM: ; d3d8 + dec c + ld b, 0 + ld hl, TMsHMs + add hl, bc + ld a, [wItemQuantityChangeBuffer] + ld b, a + ld a, [hl] + sub b + jr c, .nope + ld [hl], a + ld [wItemQuantityBuffer], a + jr nz, .yup + ld a, [wTMHMPocketScrollPosition] + and a + jr z, .yup + dec a + ld [wTMHMPocketScrollPosition], a + +.yup + scf + ret + +.nope + and a + ret + +CheckTMHM: ; d3fb + dec c + ld b, $0 + ld hl, TMsHMs + add hl, bc + ld a, [hl] + and a + ret z + scf + ret + +GetTMHMNumber:: ; d407 +; Return the number of a TM/HM by item id c. + + ld a, c + +; Skip any dummy items. + cp ITEM_C3 ; TM04-05 + jr c, .done + cp ITEM_DC ; TM28-29 + jr c, .skip + + dec a +.skip + dec a +.done + sub TM01 + inc a + ld c, a + ret + +GetNumberedTMHM: ; d417 +; Return the item id of a TM/HM by number c. + + ld a, c + +; Skip any gaps. + cp ITEM_C3 - (TM01 - 1) + jr c, .done + cp ITEM_DC - (TM01 - 1) - 1 + jr c, .skip_one + +.skip_two + inc a +.skip_one + inc a +.done + add TM01 + dec a + ld c, a + ret + +_CheckTossableItem:: ; d427 +; Return 1 in wItemAttributeParamBuffer and carry if CurItem can't be removed from the bag. + ld a, ITEMATTR_PERMISSIONS + call GetItemAttr + bit 7, a + jr nz, ItemAttr_ReturnCarry + and a + ret + +CheckSelectableItem: ; d432 +; Return 1 in wItemAttributeParamBuffer and carry if CurItem can't be selected. + ld a, ITEMATTR_PERMISSIONS + call GetItemAttr + bit 6, a + jr nz, ItemAttr_ReturnCarry + and a + ret + +CheckItemPocket:: ; d43d +; Return the pocket for CurItem in wItemAttributeParamBuffer. + ld a, ITEMATTR_POCKET + call GetItemAttr + and $f + ld [wItemAttributeParamBuffer], a + ret + +CheckItemContext: ; d448 +; Return the context for CurItem in wItemAttributeParamBuffer. + ld a, ITEMATTR_HELP + call GetItemAttr + and $f + ld [wItemAttributeParamBuffer], a + ret + +CheckItemMenu: ; d453 +; Return the menu for CurItem in wItemAttributeParamBuffer. + ld a, ITEMATTR_HELP + call GetItemAttr + swap a + and $f + ld [wItemAttributeParamBuffer], a + ret + +GetItemAttr: ; d460 +; Get attribute a of CurItem. + + push hl + push bc + + ld hl, ItemAttributes + ld c, a + ld b, 0 + add hl, bc + + xor a + ld [wItemAttributeParamBuffer], a + + ld a, [CurItem] + dec a + ld c, a + ld a, NUM_ITEMATTRS + call AddNTimes + ld a, BANK(ItemAttributes) + call GetFarByte + + pop bc + pop hl + ret + +ItemAttr_ReturnCarry: ; d47f + ld a, 1 + ld [wItemAttributeParamBuffer], a + scf + ret + +GetItemPrice: ; d486 +; Return the price of CurItem in de. + push hl + push bc + ld a, ITEMATTR_PRICE + call GetItemAttr + ld e, a + ld a, ITEMATTR_PRICE_HI + call GetItemAttr + ld d, a + pop bc + pop hl + ret diff --git a/engine/phone.asm b/engine/phone.asm index 1a3023bf1..ac21c1565 100644 --- a/engine/phone.asm +++ b/engine/phone.asm @@ -451,22 +451,20 @@ Script_ReceivePhoneCall: ; 0x90241 ; 0x90255 Script_SpecialBillCall:: ; 0x90255 - callasm Function9025c + callasm .LoadBillScript jump Script_ReceivePhoneCall -; 0x9025c -Function9025c: ; 9025c +.LoadBillScript ld e, PHONE_BILL jp LoadCallerScript ; 90261 UnknownScript_0x90261: ; 0x90261 - callasm Function9026a + callasm .LoadElmScript pause 30 jump Script_ReceivePhoneCall -; 0x9026a -Function9026a: ; 9026a +.LoadElmScript ld e, PHONE_ELM jp LoadCallerScript ; 9026f @@ -494,7 +492,6 @@ Phone_CallerTextboxWithName: ; 90292 (24:4292) call Function90363 ret - PhoneCall:: ; 9029a ld a, b ld [PhoneScriptBank], a diff --git a/engine/player_object.asm b/engine/player_object.asm new file mode 100755 index 000000000..e84dff23e --- /dev/null +++ b/engine/player_object.asm @@ -0,0 +1,856 @@ +BlankScreen: ; 8000 + call DisableSpriteUpdates + xor a + ld [hBGMapMode], a + call ClearBGPalettes + call ClearSprites + hlcoord 0, 0 + ld bc, TileMapEnd - TileMap + ld a, " " + call ByteFill + hlcoord 0, 0, AttrMap + ld bc, AttrMapEnd - AttrMap + ld a, $7 + call ByteFill + call WaitBGMap2 + call SetPalettes + ret + +SpawnPlayer: ; 8029 + ld a, -1 + ld [wObjectFollow_Leader], a + ld [wObjectFollow_Follower], a + ld a, $0 + ld hl, PlayerObjectTemplate + call CopyPlayerObjectTemplate + ld b, $0 + call PlayerSpawn_ConvertCoords + ld a, $0 + call GetMapObject + ld hl, MAPOBJECT_COLOR + add hl, bc + ln e, (1 << 3) | PAL_OW_RED, PERSONTYPE_SCRIPT + ld a, [wPlayerSpriteSetupFlags] + bit 2, a + jr nz, .ok + ld a, [PlayerGender] + bit 0, a + jr z, .ok + ln e, (1 << 3) | PAL_OW_BLUE, PERSONTYPE_SCRIPT + +.ok + ld [hl], e + ld a, $0 + ld [hMapObjectIndexBuffer], a + ld bc, MapObjects + ld a, $0 + ld [hObjectStructIndexBuffer], a + ld de, ObjectStructs + call CopyMapObjectToObjectStruct + ld a, PLAYER + ld [wCenteredObject], a + ret + +PlayerObjectTemplate: ; 8071 +; A dummy map object used to initialize the player object. +; Shorter than the actual amount copied by two bytes. +; Said bytes seem to be unused. + person_event SPRITE_CHRIS, -4, -4, SPRITEMOVEDATA_PLAYER, 15, 15, -1, -1, 0, PERSONTYPE_SCRIPT, 0, 0, -1 + +CopyDECoordsToMapObject:: ; 807e + push de + ld a, b + call GetMapObject + pop de + ld hl, MAPOBJECT_X_COORD + add hl, bc + ld [hl], d + ld hl, MAPOBJECT_Y_COORD + add hl, bc + ld [hl], e + ret + +PlayerSpawn_ConvertCoords: ; 808f + push bc + ld a, [XCoord] + add 4 + ld d, a + ld a, [YCoord] + add 4 + ld e, a + pop bc + call CopyDECoordsToMapObject + ret + +WritePersonXY:: ; 80a1 + ld a, b + call CheckObjectVisibility + ret c + + ld hl, OBJECT_NEXT_MAP_X + add hl, bc + ld d, [hl] + ld hl, OBJECT_NEXT_MAP_Y + add hl, bc + ld e, [hl] + ld a, [hMapObjectIndexBuffer] + ld b, a + call CopyDECoordsToMapObject + and a + ret + +RefreshPlayerCoords: ; 80b8 + ld a, [XCoord] + add 4 + ld d, a + ld hl, PlayerStandingMapX + sub [hl] + ld [hl], d + ld hl, MapObjects + MAPOBJECT_X_COORD + ld [hl], d + ld hl, PlayerLastMapX + ld [hl], d + ld d, a + ld a, [YCoord] + add 4 + ld e, a + ld hl, PlayerStandingMapY + sub [hl] + ld [hl], e + ld hl, MapObjects + MAPOBJECT_Y_COORD + ld [hl], e + ld hl, PlayerLastMapY + ld [hl], e + ld e, a + ld a, [wObjectFollow_Leader] + cp $0 + ret nz ; wtf + ret + +CopyObjectStruct:: ; 80e7 + call CheckObjectMask + and a + ret nz ; masked + + ld hl, ObjectStructs + OBJECT_STRUCT_LENGTH * 1 + ld a, 1 + ld de, OBJECT_STRUCT_LENGTH +.loop + ld [hObjectStructIndexBuffer], a + ld a, [hl] + and a + jr z, .done + add hl, de + ld a, [hObjectStructIndexBuffer] + inc a + cp NUM_OBJECT_STRUCTS + jr nz, .loop + scf + ret ; overflow + +.done + ld d, h + ld e, l + call CopyMapObjectToObjectStruct + ld hl, VramState + bit 7, [hl] + ret z + + ld hl, OBJECT_FLAGS2 + add hl, de + set 5, [hl] + ret + +CopyMapObjectToObjectStruct: ; 8116 + call .CopyMapObjectToTempObject + call CopyTempObjectToObjectStruct + ret + +.CopyMapObjectToTempObject: ; 811d + ld a, [hObjectStructIndexBuffer] + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld [hl], a + + ld a, [hMapObjectIndexBuffer] + ld [wTempObjectCopyMapObjectIndex], a + + ld hl, MAPOBJECT_SPRITE + add hl, bc + ld a, [hl] + ld [wTempObjectCopySprite], a + + call GetSpriteVTile + ld [wTempObjectCopySpriteVTile], a + + ld a, [hl] + call GetSpritePalette + ld [wTempObjectCopyPalette], a + + ld hl, MAPOBJECT_COLOR + add hl, bc + ld a, [hl] + and $f0 + jr z, .skip_color_override + swap a + and $7 ; OAM_PALETTE + ld [wTempObjectCopyPalette], a + +.skip_color_override + ld hl, MAPOBJECT_MOVEMENT + add hl, bc + ld a, [hl] + ld [wTempObjectCopyMovement], a + + ld hl, MAPOBJECT_RANGE + add hl, bc + ld a, [hl] + ld [wTempObjectCopyRange], a + + ld hl, MAPOBJECT_X_COORD + add hl, bc + ld a, [hl] + ld [wTempObjectCopyX], a + + ld hl, MAPOBJECT_Y_COORD + add hl, bc + ld a, [hl] + ld [wTempObjectCopyY], a + + ld hl, MAPOBJECT_RADIUS + add hl, bc + ld a, [hl] + ld [wTempObjectCopyRadius], a + ret + +InitializeVisibleSprites: ; 8177 + ld bc, MapObjects + OBJECT_LENGTH + ld a, 1 +.loop + ld [hMapObjectIndexBuffer], a + ld hl, MAPOBJECT_SPRITE + add hl, bc + ld a, [hl] + and a + jr z, .next + + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld a, [hl] + cp -1 + jr nz, .next + + ld a, [XCoord] + ld d, a + ld a, [YCoord] + ld e, a + + ld hl, MAPOBJECT_X_COORD + add hl, bc + ld a, [hl] + add 1 + sub d + jr c, .next + + cp MAPOBJECT_SCREEN_WIDTH + jr nc, .next + + ld hl, MAPOBJECT_Y_COORD + add hl, bc + ld a, [hl] + add 1 + sub e + jr c, .next + + cp MAPOBJECT_SCREEN_HEIGHT + jr nc, .next + + push bc + call CopyObjectStruct + pop bc + jp c, .ret + +.next + ld hl, OBJECT_LENGTH + add hl, bc + ld b, h + ld c, l + ld a, [hMapObjectIndexBuffer] + inc a + cp NUM_OBJECTS + jr nz, .loop + ret + +.ret: ; 81c9 + ret + +CheckObjectEnteringVisibleRange:: ; 81ca + nop + ld a, [wPlayerStepDirection] + cp STANDING + ret z + ld hl, .dw + rst JumpTable + ret + +.dw: ; 81d6 + dw .Down + dw .Up + dw .Left + dw .Right + +.Up: ; 81de + ld a, [YCoord] + sub 1 + jr .Vertical + +.Down: ; 81e5 + ld a, [YCoord] + add 9 +.Vertical: ; 81ea + ld d, a + ld a, [XCoord] + ld e, a + ld bc, MapObjects + OBJECT_LENGTH + ld a, 1 +.loop_v + ld [hMapObjectIndexBuffer], a + ld hl, MAPOBJECT_SPRITE + add hl, bc + ld a, [hl] + and a + jr z, .next_v + ld hl, MAPOBJECT_Y_COORD + add hl, bc + ld a, d + cp [hl] + jr nz, .next_v + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld a, [hl] + cp -1 + jr nz, .next_v + ld hl, MAPOBJECT_X_COORD + add hl, bc + ld a, [hl] + add 1 + sub e + jr c, .next_v + cp MAPOBJECT_SCREEN_WIDTH + jr nc, .next_v + push de + push bc + call CopyObjectStruct + pop bc + pop de + +.next_v + ld hl, OBJECT_LENGTH + add hl, bc + ld b, h + ld c, l + ld a, [hMapObjectIndexBuffer] + inc a + cp NUM_OBJECTS + jr nz, .loop_v + ret + +.Left: ; 8232 + ld a, [XCoord] + sub 1 + jr .Horizontal + +.Right: ; 8239 + ld a, [XCoord] + add 10 +.Horizontal: ; 823e + ld e, a + ld a, [YCoord] + ld d, a + ld bc, MapObjects + OBJECT_LENGTH + ld a, 1 +.loop_h + ld [hMapObjectIndexBuffer], a + ld hl, MAPOBJECT_SPRITE + add hl, bc + ld a, [hl] + and a + jr z, .next_h + ld hl, MAPOBJECT_X_COORD + add hl, bc + ld a, e + cp [hl] + jr nz, .next_h + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld a, [hl] + cp -1 + jr nz, .next_h + ld hl, MAPOBJECT_Y_COORD + add hl, bc + ld a, [hl] + add 1 + sub d + jr c, .next_h + cp MAPOBJECT_SCREEN_HEIGHT + jr nc, .next_h + push de + push bc + call CopyObjectStruct + pop bc + pop de + +.next_h + ld hl, OBJECT_LENGTH + add hl, bc + ld b, h + ld c, l + ld a, [hMapObjectIndexBuffer] + inc a + cp NUM_OBJECTS + jr nz, .loop_h + ret + +CopyTempObjectToObjectStruct: ; 8286 + ld a, [wTempObjectCopyMapObjectIndex] + ld hl, OBJECT_MAP_OBJECT_INDEX + add hl, de + ld [hl], a + + ld a, [wTempObjectCopyMovement] + call CopySpriteMovementData + + ld a, [wTempObjectCopyPalette] + ld hl, OBJECT_PALETTE + add hl, de + or [hl] + ld [hl], a + + ld a, [wTempObjectCopyY] + call .InitYCoord + + ld a, [wTempObjectCopyX] + call .InitXCoord + + ld a, [wTempObjectCopySprite] + ld hl, OBJECT_SPRITE + add hl, de + ld [hl], a + + ld a, [wTempObjectCopySpriteVTile] + ld hl, OBJECT_SPRITE_TILE + add hl, de + ld [hl], a + + ld hl, OBJECT_STEP_TYPE + add hl, de + ld [hl], STEP_TYPE_00 + + ld hl, OBJECT_FACING_STEP + add hl, de + ld [hl], STANDING + + ld a, [wTempObjectCopyRadius] + call .InitRadius + + ld a, [wTempObjectCopyRange] + ld hl, OBJECT_RANGE + add hl, de + ld [hl], a + + and a + ret + +.InitYCoord: ; 82d5 + ld hl, OBJECT_INIT_Y + add hl, de + ld [hl], a + + ld hl, OBJECT_NEXT_MAP_Y + add hl, de + ld [hl], a + + ld hl, YCoord + sub [hl] + and $f + swap a + ld hl, wFollowNotExactPersonY + sub [hl] + ld hl, OBJECT_SPRITE_Y + add hl, de + ld [hl], a + ret + +.InitXCoord: ; 82f1 + ld hl, OBJECT_INIT_X + add hl, de + ld [hl], a + ld hl, OBJECT_NEXT_MAP_X + add hl, de + ld [hl], a + ld hl, XCoord + sub [hl] + and $f + swap a + ld hl, wFollowNotExactPersonX + sub [hl] + ld hl, OBJECT_SPRITE_X + add hl, de + ld [hl], a + ret + +.InitRadius: ; 830d + ld h, a + inc a + and $f + ld l, a + ld a, h + add $10 + and $f0 + or l + ld hl, OBJECT_RADIUS + add hl, de + ld [hl], a + ret + +TrainerWalkToPlayer: ; 831e + ld a, [hLastTalked] + call InitMovementBuffer + ld a, movement_step_sleep_1 + call AppendToMovementBuffer + ld a, [wd03f] + dec a + jr z, .TerminateStep + ld a, [hLastTalked] + ld b, a + ld c, PLAYER + ld d, 1 + call .GetPathToPlayer + call DecrementMovementBufferCount + +.TerminateStep + ld a, movement_step_end + call AppendToMovementBuffer + ret + +.GetPathToPlayer: ; 8341 + push de + push bc +; get player object struct, load to de + ld a, c + call GetMapObject + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld a, [hl] + call GetObjectStruct + ld d, b + ld e, c + +; get last talked object struct, load to bc + pop bc + ld a, b + call GetMapObject + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld a, [hl] + call GetObjectStruct + +; get last talked coords, load to bc + ld hl, OBJECT_NEXT_MAP_X + add hl, bc + ld a, [hl] + ld hl, OBJECT_NEXT_MAP_Y + add hl, bc + ld c, [hl] + ld b, a + +; get player coords, load to de + ld hl, OBJECT_NEXT_MAP_X + add hl, de + ld a, [hl] + ld hl, OBJECT_NEXT_MAP_Y + add hl, de + ld e, [hl] + ld d, a + + pop af + call ComputePathToWalkToPlayer + ret + +Special_SurfStartStep: ; 8379 + call InitMovementBuffer + call .GetMovementData + call AppendToMovementBuffer + ld a, movement_step_end + call AppendToMovementBuffer + ret + +.GetMovementData: ; 8388 + ld a, [PlayerDirection] + srl a + srl a + and 3 + ld e, a + ld d, 0 + ld hl, .movement_data + add hl, de + ld a, [hl] + ret + +.movement_data + slow_step_down + slow_step_up + slow_step_left + slow_step_right + +FollowNotExact:: ; 839e + push bc + ld a, c + call CheckObjectVisibility + ld d, b + ld e, c + pop bc + ret c + + ld a, b + call CheckObjectVisibility + ret c + +; Person 2 is now in bc, person 1 is now in de + ld hl, OBJECT_NEXT_MAP_X + add hl, bc + ld a, [hl] + ld hl, OBJECT_NEXT_MAP_Y + add hl, bc + ld c, [hl] + ld b, a + + ld hl, OBJECT_NEXT_MAP_X + add hl, de + ld a, [hl] + cp b + jr z, .same_x + jr c, .to_the_left + inc b + jr .continue + +.to_the_left + dec b + jr .continue + +.same_x + ld hl, OBJECT_NEXT_MAP_Y + add hl, de + ld a, [hl] + cp c + jr z, .continue + jr c, .below + inc c + jr .continue + +.below + dec c + +.continue + ld hl, OBJECT_NEXT_MAP_X + add hl, de + ld [hl], b + ld a, b + ld hl, XCoord + sub [hl] + and $f + swap a + ld hl, wFollowNotExactPersonX + sub [hl] + ld hl, OBJECT_SPRITE_X + add hl, de + ld [hl], a + ld hl, OBJECT_NEXT_MAP_Y + add hl, de + ld [hl], c + ld a, c + ld hl, YCoord + sub [hl] + and $f + swap a + ld hl, wFollowNotExactPersonY + sub [hl] + ld hl, OBJECT_SPRITE_Y + add hl, de + ld [hl], a + ld a, [hObjectStructIndexBuffer] + ld hl, OBJECT_RANGE + add hl, de + ld [hl], a + ld hl, OBJECT_MOVEMENTTYPE + add hl, de + ld [hl], SPRITEMOVEDATA_FOLLOWNOTEXACT + ld hl, OBJECT_STEP_TYPE + add hl, de + ld [hl], STEP_TYPE_00 + ret + +GetRelativeFacing:: ; 8417 +; Determines which way map object e would have to turn to face map object d. Returns carry if it's impossible for whatever reason. + ld a, d + call GetMapObject + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld a, [hl] + cp NUM_OBJECT_STRUCTS + jr nc, .carry + ld d, a + ld a, e + call GetMapObject + ld hl, MAPOBJECT_OBJECT_STRUCT_ID + add hl, bc + ld a, [hl] + cp NUM_OBJECT_STRUCTS + jr nc, .carry + ld e, a + call .GetFacing_e_relativeto_d + ret + +.carry + scf + ret + +.GetFacing_e_relativeto_d: ; 8439 +; Determines which way object e would have to turn to face object d. Returns carry if it's impossible. +; load the coordinates of object d into bc + ld a, d + call GetObjectStruct + ld hl, OBJECT_NEXT_MAP_X + add hl, bc + ld a, [hl] + ld hl, OBJECT_NEXT_MAP_Y + add hl, bc + ld c, [hl] + ld b, a + push bc +; load the coordinates of object e into de + ld a, e + call GetObjectStruct + ld hl, OBJECT_NEXT_MAP_X + add hl, bc + ld d, [hl] + ld hl, OBJECT_NEXT_MAP_Y + add hl, bc + ld e, [hl] + pop bc +; |x1 - x2| + ld a, b + sub d + jr z, .same_x_1 + jr nc, .b_right_of_d_1 + cpl + inc a + +.b_right_of_d_1 +; |y1 - y2| + ld h, a + ld a, c + sub e + jr z, .same_y_1 + jr nc, .c_below_e_1 + cpl + inc a + +.c_below_e_1 +; |y1 - y2| - |x1 - x2| + sub h + jr c, .same_y_1 + +.same_x_1 +; compare the y coordinates + ld a, c + cp e + jr z, .same_x_and_y + jr c, .c_directly_below_e +; c directly above e + ld d, DOWN + and a + ret + +.c_directly_below_e + ld d, UP + and a + ret + +.same_y_1 + ld a, b + cp d + jr z, .same_x_and_y + jr c, .b_directly_right_of_d +; b directly left of d + ld d, RIGHT + and a + ret + +.b_directly_right_of_d + ld d, LEFT + and a + ret + +.same_x_and_y + scf + ret + +QueueFollowerFirstStep: ; 848a + call .QueueFirstStep + jr c, .same + ld [wFollowMovementQueue], a + xor a + ld [wFollowerMovementQueueLength], a + ret + +.same + ld a, -1 + ld [wFollowerMovementQueueLength], a + ret + +.QueueFirstStep + ld a, [wObjectFollow_Leader] + call GetObjectStruct + ld hl, OBJECT_NEXT_MAP_X + add hl, bc + ld d, [hl] + ld hl, OBJECT_NEXT_MAP_Y + add hl, bc + ld e, [hl] + ld a, [wObjectFollow_Follower] + call GetObjectStruct + ld hl, OBJECT_NEXT_MAP_X + add hl, bc + ld a, d + cp [hl] + jr z, .check_y + jr c, .left + and a + ld a, movement_step_right + ret + +.left + and a + ld a, movement_step_left + ret + +.check_y + ld hl, OBJECT_NEXT_MAP_Y + add hl, bc + ld a, e + cp [hl] + jr z, .same_xy + jr c, .up + and a + ld a, movement_step_down + ret + +.up + and a + ld a, movement_step_up + ret + +.same_xy + scf + ret diff --git a/engine/printnum.asm b/engine/printnum.asm new file mode 100755 index 000000000..4ef7721c8 --- /dev/null +++ b/engine/printnum.asm @@ -0,0 +1,300 @@ +_PrintNum:: ; c4c7 +; Print c digits of the b-byte value from de to hl. +; Allows 2 to 7 digits. For 1-digit numbers, add +; the value to char "0" instead of calling PrintNum. +; Some extra flags can be given in bits 5-7 of b. +; Bit 5: money if set (unless left-aligned without leading zeros) +; Bit 6: right-aligned if set +; Bit 7: print leading zeros if set + + push bc + + bit 5, b + jr z, .main + bit 7, b + jr nz, .moneyflag + bit 6, b + jr z, .main + +.moneyflag ; 101xxxxx or 011xxxxx + ld a, "¥" + ld [hli], a + res 5, b ; 100xxxxx or 010xxxxx + +.main + xor a + ld [hPrintNum1], a + ld [hPrintNum2], a + ld [hPrintNum3], a + ld a, b + and $f + cp 1 + jr z, .byte + cp 2 + jr z, .word +; maximum 3 bytes +.long + ld a, [de] + ld [hPrintNum2], a + inc de + ld a, [de] + ld [hPrintNum3], a + inc de + ld a, [de] + ld [hPrintNum4], a + jr .start + +.word + ld a, [de] + ld [hPrintNum3], a + inc de + ld a, [de] + ld [hPrintNum4], a + jr .start + +.byte + ld a, [de] + ld [hPrintNum4], a + +.start + push de + + ld d, b + ld a, c + swap a + and $f + ld e, a + ld a, c + and $f + ld b, a + ld c, 0 + cp 2 + jr z, .two + cp 3 + jr z, .three + cp 4 + jr z, .four + cp 5 + jr z, .five + cp 6 + jr z, .six + +.seven + ld a, 1000000 / $10000 % $100 + ld [hPrintNum5], a + ld a, 1000000 / $100 % $100 + ld [hPrintNum6], a + ld a, 1000000 % $100 + ld [hPrintNum7], a + call .PrintDigit + call .AdvancePointer + +.six + ld a, 100000 / $10000 % $100 + ld [hPrintNum5], a + ld a, 100000 / $100 % $100 + ld [hPrintNum6], a + ld a, 100000 % $100 + ld [hPrintNum7], a + call .PrintDigit + call .AdvancePointer + +.five + xor a + ld [hPrintNum5], a + ld a, 10000 / $100 + ld [hPrintNum6], a + ld a, 10000 % $100 + ld [hPrintNum7], a + call .PrintDigit + call .AdvancePointer + +.four + xor a + ld [hPrintNum5], a + ld a, 1000 / $100 + ld [hPrintNum6], a + ld a, 1000 % $100 + ld [hPrintNum7], a + call .PrintDigit + call .AdvancePointer + +.three + xor a + ld [hPrintNum5], a + xor a + ld [hPrintNum6], a + ld a, 100 + ld [hPrintNum7], a + call .PrintDigit + call .AdvancePointer + +.two + dec e + jr nz, .two_skip + ld a, "0" + ld [hPrintNum1], a +.two_skip + + ld c, 0 + ld a, [hPrintNum4] +.mod_10 + cp 10 + jr c, .modded_10 + sub 10 + inc c + jr .mod_10 +.modded_10 + + ld b, a + ld a, [hPrintNum1] + or c + jr nz, .money + call .PrintLeadingZero + jr .money_leading_zero + +.money + call .PrintYen + push af + ld a, "0" + add c + ld [hl], a + pop af + ld [hPrintNum1], a + inc e + dec e + jr nz, .money_leading_zero + inc hl + ld [hl], $f2 ; XXX + +.money_leading_zero + call .AdvancePointer + call .PrintYen + ld a, "0" + add b + ld [hli], a + + pop de + pop bc + ret + +.PrintYen: ; c5ba + push af + ld a, [hPrintNum1] + and a + jr nz, .stop + bit 5, d + jr z, .stop + ld a, "¥" + ld [hli], a + res 5, d + +.stop + pop af + ret + +.PrintDigit: ; c5cb (3:45cb) + dec e + jr nz, .ok + ld a, "0" + ld [hPrintNum1], a +.ok + ld c, 0 +.loop + ld a, [hPrintNum5] + ld b, a + ld a, [hPrintNum2] + ld [hPrintNum8], a + cp b + jr c, .skip1 + sub b + ld [hPrintNum2], a + ld a, [hPrintNum6] + ld b, a + ld a, [hPrintNum3] + ld [hPrintNum9], a + cp b + jr nc, .skip2 + ld a, [hPrintNum2] + or 0 + jr z, .skip3 + dec a + ld [hPrintNum2], a + ld a, [hPrintNum3] +.skip2 + sub b + ld [hPrintNum3], a + ld a, [hPrintNum7] + ld b, a + ld a, [hPrintNum4] + ld [hPrintNum10], a + cp b + jr nc, .skip4 + ld a, [hPrintNum3] + and a + jr nz, .skip5 + ld a, [hPrintNum2] + and a + jr z, .skip6 + dec a + ld [hPrintNum2], a + xor a +.skip5 + dec a + ld [hPrintNum3], a + ld a, [hPrintNum4] +.skip4 + sub b + ld [hPrintNum4], a + inc c + jr .loop +.skip6 + ld a, [hPrintNum9] + ld [hPrintNum3], a +.skip3 + ld a, [hPrintNum8] + ld [hPrintNum2], a +.skip1 + ld a, [hPrintNum1] + or c + jr z, .PrintLeadingZero + ld a, [hPrintNum1] + and a + jr nz, .done + bit 5, d + jr z, .done + ld a, "¥" + ld [hli], a + res 5, d +.done + ld a, "0" + add c + ld [hl], a + ld [hPrintNum1], a + inc e + dec e + ret nz + inc hl + ld [hl], "·" + ret + +.PrintLeadingZero: ; c644 +; prints a leading zero unless they are turned off in the flags + bit 7, d ; print leading zeroes? + ret z + ld [hl], "0" + ret + +.AdvancePointer: ; c64a +; increments the pointer unless leading zeroes are not being printed, +; the number is left-aligned, and no nonzero digits have been printed yet + bit 7, d ; print leading zeroes? + jr nz, .inc + bit 6, d ; left alignment or right alignment? + jr z, .inc + ld a, [hPrintNum1] + and a + ret z +.inc + inc hl + ret diff --git a/engine/sine.asm b/engine/sine.asm new file mode 100755 index 000000000..b5da8059c --- /dev/null +++ b/engine/sine.asm @@ -0,0 +1,50 @@ +_Sine:: ; 84d9 +; A simple sine function. +; Return d * sin(e) in hl. + +; e is a signed 6-bit value. + ld a, e + and %111111 + cp %100000 + jr nc, .negative + + call .ApplySineWave + ld a, h + ret + +.negative + and %011111 + call .ApplySineWave + ld a, h + xor -1 + inc a + ret + +.ApplySineWave: ; 84ef + ld e, a + ld a, d + ld d, 0 + ld hl, .sinewave + add hl, de + add hl, de + ld e, [hl] + inc hl + ld d, [hl] + ld hl, 0 + +; Factor amplitude +.multiply + srl a + jr nc, .even + add hl, de +.even + sla e + rl d + and a + jr nz, .multiply + ret + +.sinewave: ; 850b +; A $20-word table representing a sine wave. +; 90 degrees is index $10 at a base amplitude of $100. + sine_wave $100 |