Instructions
The following is a list of instructions opcodes used by Yoda Stories.
TODO: Check if Indy uses the same opcodes
| Opcode | Name | # of arguments | Description |
|---|---|---|---|
| 0x000 | PlaceTile | 4 | Place tile arg_3 at arg_0xarg_1xarg_2. To remove a tile the id -1 is used. |
| 0x001 | RemoveTile | 3 | Remove tile at arg_0xarg_1xarg_2 |
| 0x002 | MoveTile | 5 | Move Tile at arg_0xarg_0xarg_2 to arg_3xarg_4xarg_2. Note that this can not be used to move tiles between layers! |
| 0x003 | DrawTile | 5 | |
| 0x004 | SpeakHero | 0 | Show speech bubble next to hero. Uses text attribute. |
| 0x005 | SpeakNpc | 2 | Show speech bubble at arg_0xarg_1. Uses text attribute. The characters ¢ and ¥ are used as placeholders for provided and required items of the current zone, respectively. |
| 0x006 | SetTileNeedsDisplay | 2 | Redraw tile at arg_0xarg_1 |
| 0x007 | SetRectNeedsDisplay | 4 | Redraw the part of the current scene, specified by a rectangle positioned at arg_0xarg_1 with width arg_2 and height arg_3. |
| 0x008 | Wait | 0 | Pause script execution for one tick. |
| 0x009 | Redraw | 0 | Redraw the whole scene immediately |
| 0x00a | PlaySound | 1 | Play sound specified by arg_0 |
| 0x00b | StopSound | 0 | Stop playing sounds. _TODO: check if only music need to be stopped` |
| 0x00c | RollDice | 1 | Set current zone's random to a random value between 1 and arg_0. |
| 0x00d | SetCounter | 1 | Set current zone's counter value to a arg_0 |
| 0x00e | AddToCounter | 1 | Add arg_0 to current zone's counter value |
| 0x00f | SetVariable | 4 | Set variable identified by arg_0⊕arg_1⊕arg_2 to arg_3. Internally this is implemented as opcode 0x00, setting tile at arg_0xarg_1xarg_2 to arg_3. |
| 0x010 | HideHero | 0 | Hide hero |
| 0x011 | ShowHero | 0 | Show hero |
| 0x012 | MoveHeroTo | 2 | Set hero's position to arg_0xarg_1 ignoring impassable tiles. Execute hotspot actions, redraw the current scene and move camera if the hero is not hidden. |
| 0x013 | MoveHeroBy | 5 | |
| 0x014 | DisableAction | 0 | Disable current action |
| 0x015 | EnableHotspot | 1 | Enable hotspot arg_0 |
| 0x016 | DisableHotspot | 1 | Disable hotspot arg_0 |
| 0x017 | EnableMonster | 1 | Enable monster arg_0 |
| 0x018 | DisableMonster | 1 | Disable monster arg_0 |
| 0x019 | EnableAllMonsters | 0 | Enable all monsters |
| 0x01a | DisableAllMonsters | 0 | Disable all monsters |
| 0x01b | DropItem | 3 | Drops item arg_0 for pickup at arg_1xarg_2. If the item is -1, it drops the current sector's find item. instead |
| 0x01c | AddItem | 1 | Add item with id arg_0 to inventory |
| 0x01d | RemoveItem | 1 | Remove one instance of item arg_0 from the inventory |
| 0x01e | MarkAsSolved | 0 | |
| 0x01f | WinGame | 0 | |
| 0x020 | LoseGame | 0 | |
| 0x021 | ChangeZone | 3 | Change current zone to arg_0. Hero will be placed at arg_1xarg_2 in the new zone. |
| 0x022 | SetSectorCounter | 1 | Set current zone's sector-counter value to a arg_0 |
| 0x023 | AddToSectorCounter | 1 | Add arg_0 to current zone's sector-counter value |
| 0x024 | SetRandom | 1 | Set current zone's random value to a arg_0 |
| 0x025 | AddHealth | 1 | Increase hero's health by arg_0. New health is capped at hero's max health (0x300). |