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.
0x000F0040 u32, valid values are 0x1 and 0x2, values 0x0 and 0x3 have the same effect as value 0x2. Only bits 1-0 are used. Disable/enable alpha testing. Parameter value 0x1 disables GL_ALPHA_TEST, while value 0x2 enables GL_ALPHA_TEST.
0x000F0041 float This is used to initialize the projection matrix?
0x000F0042 float This is used immediately after CmdID 0x000F0043, for the third parameter for CmdID 0x000F0041.
0x000F0043 float This is used immediately after CmdID 0x000F0041, for the second parameter.
0x000F0044 float This is used immediately after CmdID 0x000F0042, for the fourth parameter for CmdID 0x000F0041.
0x801F004D First word in parameter structure ?
0x000F0068 u32 This is used immediately after CmdID 0x000F0044.
0x000F006E u32 This is used immediately after CmdID 0x000F011E, with the same input parameter value as CmdID 0x000F011E.
0x000F008E u32 Texture related?
0x000F0116 u32 Unknown, this is used immediately after CmdID 0x000F011D.
0x000F0117 u32 Unknown, normally the input parameter is value 0x2.
0x000F011C Physical address>>3 Unknown, normally this address is located in VRAM. This command is used immediately after 0x000F0116.
0x000F011D Physical address>>3 This initializes the framebuffer address used for rendering, this framebuffer is used for the input framebuffer with GX command 3 and 4. This command is used immediately after CmdID 0x000F0117.
0x000F011E u32 This sets the width and height for the framebuffer used for rendering. Therefore this is glViewport() with x=0 and y=0. This is used immediately after CmdID 0x000F011C.
0x000F02B0 u32, value is 0x7FFF0000 | val. Texture related?
0x000F02C0 0x80000000 | Type This is used immediately before CmdID 0xXXXF02C1. This type field controls the command parameter buffer type.
0xXXXF02C1 First word in the first entry A list of entries follow this command.

Parameter value format for CmdID 0x000F011E

Bit Description
11-0 Framebuffer width
23-12 Framebuffer height - 1
24 Must be set
31-25 Unused?

Normally the width and height is set to the same dimensions used with GX command 3 and 4.

Entries for CmdID 0xXXXF02C1

Index Word Description
0 float
1 float
2 float

Color Entry

Index Word Description
0 float Red component
1 float Blue component
2 float Green component
3 float Alpha?
4 float
5 float

Vertex Entry

Index Word Description
0 float X coordinate
1 float Y coordinate
2 float Z coordinate

Type 0x14 seems to used for rendering quads, mainly for the skybox/sub screen etc. The rest of the rendered objects are likely rendered via vertex arrays, however it's unknown how the vertex arrays are initialized.

Types for CmdID 0x000F02C0

Value Entries per chunk Description
0x00 4 Related to model-view matrix translation?
0x04 4 Unknown, this is used immediately after type 0x00.
0x08 One color entry via two CmdID 0xXXXF02C1 entries. Sets the color.
0x0A 4 Texture related?
0x0B 3 ?
0x14 <=30 Geometry vertices
0x4C 4 ?
0x50, 0x53, and 0x56 1 ?
0x51, 0x54, and 0x57 1 ?
0x52, 0x55, and 0x58 1 ?
0x59 1 Unknown, the entry data is floats converted from s32s.
0x5A 2 Color related?
0x5C 1 ?