Difference between revisions of "Objects"
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(Objects introduction + Offset tables) |
(Added information about double linked list) |
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Objects are created by declaration in the [[Map Object Header]] or by script command. | Objects are created by declaration in the [[Map Object Header]] or by script command. | ||
== Object Data == | |||
Offsets must be added to the object handle to get the memory address. | Offsets must be added to the object handle to get the memory address. | ||
Line 31: | Line 31: | ||
|- | |- | ||
| 7E0016 || 2 || Elevation level (sprites on different levels can't hit each other) | | 7E0016 || 2 || Elevation level (sprites on different levels can't hit each other) | ||
|- | |||
| 7E002C || 2 || Previous Object in List | |||
|- | |||
| 7E002E || 2 || Next Object in List | |||
|} | |} | ||
Line 78: | Line 82: | ||
|- | |- | ||
| 7F102A || 2 || Current HP | | 7F102A || 2 || Current HP | ||
|} | |||
== Double Linked List == | |||
Objects are organized in a double linked list. | |||
The list defines, among other things, the order in which scripts run. | |||
{| class="wikitable" | |||
|+ Double Linked List | |||
|- | |||
! Offset !! Description | |||
|- | |||
| 0DFA || First entry | |||
|- | |||
| 0DFC || Last entry | |||
|- | |||
| object[2C] || Predecessor | |||
|- | |||
| object[2E] || Successor | |||
|} | |} |
Revision as of 16:58, 22 February 2016
The game uses objects to store runtime information about sprites and scripts, e.g. size and position of a sprite, or the current script address. Each object has a handle in range 0x1000...0x1F80, in steps of 0x40, allowing for a maximum of 63 objects. Object data is stored in chunks of 0x1000 bytes at various places in RAM. Objects are created by declaration in the Map Object Header or by script command.
Object Data
Offsets must be added to the object handle to get the memory address.
Offset | Size | Description |
---|---|---|
7E0000 | 2 | X Position (signed) |
7E0002 | 2 | Y Position (signed) |
7E0004 | 2 | Flags |
7E0006 | 2 | Flags2 |
7E0008 | 2 | Flags3 |
7E000A | 3 | Script Pointer, also used for reentry |
7E000E | 2 | Reentry Delay in frames |
7E0012 | 1 | Bank for bounds data (used with ptr at 7F000A) |
7E0016 | 2 | Elevation level (sprites on different levels can't hit each other) |
7E002C | 2 | Previous Object in List |
7E002E | 2 | Next Object in List |
Offset | Size | Description | ||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
7F000A | 2 | Pointer to Bounding Rect Table [ROM], used with bank at 7E0012
Values are signed 8 bit pixel coordinates, relative to the object's X and Y position. | ||||||||||||||||||||||
7F0018 | 2 | Movement dx | ||||||||||||||||||||||
7F001A | 2 | Movement dy |
Offset | Size | Description |
---|---|---|
7F1022 | 2 | Fighting Data Ptr [ROM], Bank: 8D |
7F102A | 2 | Current HP |
Double Linked List
Objects are organized in a double linked list. The list defines, among other things, the order in which scripts run.
Offset | Description |
---|---|
0DFA | First entry |
0DFC | Last entry |
object[2C] | Predecessor |
object[2E] | Successor |