0x40 — load_background

Reads a background id, optionally through GetEventValueForScript, and calls CBackGround::LoadData.

proven— handler traced, and exercised by at least one shipped script.

At a glance

Opcode	`0x40` (64)
Handler	`CRadiScript::Command_40`
Signature	`CRadiScript::Command_40(int,SCR_DATA*,unsigned int,unsigned int)`
Translation unit	`r_script_run4.cpp`
Address	— debug build; click for all 3
Handler size	`0x5C` (92 bytes)
Family	Background, map, landscape and camera
Command size	`4 + extra_words * 4` bytes

Handler behaviour

Reads a background id, optionally through GetEventValueForScript, and calls CBackGround::LoadData.

Encoding

The command header is one 32-bit word, as described in §3 Instruction encoding:

 31            24 23            16 15             8 7              0
+----------------+----------------+----------------+----------------+
|  flags         |  argument byte |  extra words   |  0x40          |
+----------------+----------------+----------------+----------------+

Bits 8–15 give the number of 32-bit operand words that follow. Bits 16–23 are handed to the handler as a bitfield; on character commands bit 0 normally says whether a character selector word is present. Bit 31 is the keep-going bit.

Operand fields

4 documented fields. input fields are read from the command's operand words; derived fields are computed from other fields rather than stored separately.

Field	Role	Meaning
`event_value`	input	Script event-value id that the condition or command reads.
`id`	input	Identifier for the thing this command acts on.
`slot`	input	Index into a runtime table owned by this command's subsystem.
`yield`	derived	Pause the script here for one game frame; the next command runs on the following update. Lines without it keep running immediately.

Engine calls

Engine functions this handler was observed calling:

CBackGround::LoadData(unsigned int,unsigned int,bool)
CRadiScript::GetEventValueForScript(int,const SCR_DATA*)

Bit masks

Masks the handler applies to its argument byte or operand words:

0x0080 0xFFFF 0x0003