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 cmdID.

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.
0x000F0042 float y vector This sets Y scaling for the current matrix.
0x000F0044 float x vector This sets X scaling for the current matrix.
0x000F02C0 0x80000000 | Unknown This is used immediately before CmdID 0xXXXF02C1.
0xXXXF02C1 float X coordinate for the first vertex CmdID is 0x000F02C1 | ((totalvertices<<22) - 0x100000). The vertex entries is the data following the command. The first word in the first vertex entry is the Y coordinate.

Vertex Entry

Index Word Description
0 float X coordinate, for the first vertex this is stored in the command parameter instead.
1 float Y coordinate
2 float Z coordinate
3 Padding for the last vertex entry