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Difference between revisions of "SCUMM/Technical Reference/Script resources"
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SCUMM/Technical Reference/Script resources (view source)
Revision as of 13:48, 16 November 2021
, 13:48, 16 November 2021no edit summary
Jestar jokin (talk | contribs) (→Object Scripts in V3/4 (OC): Filled out unknowns based on object.cpp/ScummEngine_v4::resetRoomObject) |
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Script code variable | Script code variable | ||
== Room Entry Scripts (EN or ENCD) == | == SCUMM V1 and V2 Room Entry and Exit Scripts == | ||
In SCUMM V1 and V2, the entry and exit scripts are part of [[SCUMM/Technical_Reference/Room resources#Header|the room resource]]. | |||
== SCUMM V3+ Room Entry Scripts (EN or ENCD) == | |||
This block contains special code when a room is entered. | This block contains special code when a room is entered. | ||
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Script code variable | Script code variable | ||
== SCUMM V3+ Room Exit Scripts (EX or EXCD) == | |||
== Room Exit Scripts (EX or EXCD) == | |||
This block contains special code when the player leaves a room | This block contains special code when the player leaves a room | ||
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Script code variable | Script code variable | ||
== SCUMM V3 and V4 Object Scripts (OC) == | |||
== Object Scripts | |||
In Version 3 and 4 the code can be found in the '''OC''' block: | In Version 3 and 4 the code can be found in the '''OC''' block: | ||
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The offset table is a variable block like that used in the VERB block in later games, which contains the verb identifier (1 byte) and the absolute offset (2 bytes). The table end is marked with 0x00. Next is the object's name, which is a standard null-terminated string. After this follows the actual object code. Note that unlike other script types, because there are multiple entry points (one for each supported verb), there are also multiple exit points (or "stopObjectCode" instructions). | The offset table is a variable block like that used in the VERB block in later games, which contains the verb identifier (1 byte) and the absolute offset (2 bytes). The table end is marked with 0x00. Next is the object's name, which is a standard null-terminated string. After this follows the actual object code. Note that unlike other script types, because there are multiple entry points (one for each supported verb), there are also multiple exit points (or "stopObjectCode" instructions). | ||
== SCUMM V5+ Object Scripts (OBCD) == | |||
These are scripts that correspond to VERB actions. VERBs are predefined activities at the bottom of the screen, e.g. "Open", "Look", "Give" etc. For each named object in a room, the game designer could define responses to the players actions. A single VERB block contains the code for all possible player actions on the object. Starting with version 5, the whole code can be found in an [[Object resources|Object Resource]]. | |||
OBCD | |||
Block name 4 bytes ("OBCD") | |||
Block size 4 bytes | |||
CDHD | |||
Block name 4 bytes ("CDHD") | |||
Block size 4 bytes (25) | |||
obj id 2 bytes | |||
... see [[Object resources|Object Resource]] | |||
VERB | |||
Block name 4 bytes ("VERB") | |||
Block size 4 bytes | |||
offset table variable { | |||
verb 1 byte (0xFF is default) | |||
offset 2 bytes | |||
} | |||
table end 1 byte (must be 0x00) | |||
object code variable | |||
OBNA | |||
Block name 4 bytes ("OBNA") | |||
Block size 4 bytes | |||
object name null-terminated string | |||