0x71 — play_bgm

Calls CRadiSound::PlayBgm(unsigned int) with handler_arg_byte & 3.

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

At a glance

Opcode	`0x71` (113)
Handler	`CRadiScript::Command_71`
Signature	`CRadiScript::Command_71(int,SCR_DATA*,unsigned int,unsigned int)`
Translation unit	`r_script_run7.cpp`
Address	— debug build; click for all 3
Handler size	`0x28` (40 bytes)
Engine name	`play_bgm`
Family	Primitives, textures, sound and movies
Command size	`4 + extra_words * 4` bytes

Handler behaviour

Calls CRadiSound::PlayBgm(unsigned int) with handler_arg_byte & 3.

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   |  0x71          |
+----------------+----------------+----------------+----------------+

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

2 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
`mode`	input	Handler path selector taken from the argument byte. The meaning is specific to each command.
`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:

CRadiSound::PlayBgm(unsigned int)

Bit masks

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

0x0003