This page describes the structure of the buffer for GX command 1 with the registers at 0x1EF018E0. This buffer is used for GPU commands including OpenGL commands, each 8-byte entry in the buffer is a command. Cmd+0 is the command parameter, and cmd+4 is the command header.
Command Header
| Bit
|
Description
|
| 19-0
|
Command ID
|
| 30-20
|
Total words following the command, if any.
|
| 31
|
?
|
The first word in the parameter data structure is the command parameter value, the rest of the data structure is from the data following the command. The word after the last data structure word is padding when needed for 8-byte alignment, for the following command.
Commands
| CommandID
|
Parameter
|
Description
|
| 0x000F0010
|
Value is 0x12345678
|
This command is always the last command in the buffer.
|
| 0x000F0110
|
Value 0x1
|
This command is immediately before CmdID 0x000F0010, this is used elsewhere in the buffer as well.
|
| 0x000F0111
|
Value 0x1
|
This command is immediately before CmdID 0x000F0110, however CmdID 0x000F0110 doesn't always follow this command.
|
| 0x000F0041
|
float Z vector
|
This sets Z scaling for the current matrix.
|
| 0x000F0042
|
float Y vector
|
This sets Y scaling for the current matrix.
|
| 0x000F0043
|
float unknown
|
?
|
| 0x000F0044
|
float X vector
|
This sets X scaling for the current matrix.
|
| 0x801F004D
|
First word in parameter structure
|
?
|
| 0x000F02C0
|
0x80000000 | Type
|
This is used immediately before CmdID 0xXXXF02C1. This type field controls the command parameter buffer type, 0x00 is for regular vertices.
|
| 0xXXXF02C1
|
float X coordinate for the first vertex
|
The vertex entries is the data following the command.
|
Vertex Entry
| Index Word
|
Description
|
| 0
|
float X coordinate
|
| 1
|
float Y coordinate
|
| 2
|
float Z coordinate
|