BFLYT (File Format)

BFLYT (Binary caFe LaYouT) is a layout file foormat used on Wii U and Nintendo Switch. It contains 2D layout information.

Format

Header

The file starts with a header which is 0x14 bytes long.

Offset	Type	Description
0x00	Char[4]	File magic. Always FLYT in ASCII.
0x04	UInt16	Byte-order-mark. FE FF for big endian, FF FE for little endian.
0x06	UInt16	Header size.
0x08	UInt32	Version number.
0x0C	UInt32	Size of the file in bytes.
0x10	UInt16	Number of sections.
0x12	UInt16	Padding.

After the header comes all sections. The first section is always lyt1, and after comes optionally txl1, fnl1 and mat1. After that comes all panes, then all groups. Optionally at the end comes cnt1. Most sections can also have an usd1 section attached after.

lyt1

The lyt1 section contains general information about the layout.

Offset	Type	Description
0x00	Char[4]	Section magic. Always lyt1 in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	Byte	Drawn from center flag.
0x09	Byte[3]	Padding.
0x0C	Float	Width of the layout.
0x10	Float	Height of the layout.
0x14	Float	Max parts width. Unknown meaning.
0x18	Float	Max parts height. Unknown meaning.
0x1C	StringNT	Layout name.

txl1

The txl1 section is a list of external BFLIM files, or textures inside a BNTX file.

Offset	Type	Description
0x00	Char[4]	Section magic. Always txl1 in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	UInt16	N = Number of textures.
0x0A	UInt16	Padding.
0x0C	UInt32[N]	Texture string offsets. Links to null-terminated strings.

fnl1

The fnl section is a font list. It links to external BFFNT files.

Offset	Type	Description
0x00	Char[4]	Section magic. Always fnl1 in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	UInt16	N = Number of fonts.
0x0A	UInt16	Padding.
0x0C	UInt32[N]	Font string offsets. Links to null-terminated strings.

mat1

The mat1 section stores materials. It is currently unknown.

Offset	Type	Description
0x00	Char[4]	Section magic. Always mat1 in ASCII.
0x04	UInt32	S = Section size.
0x08	Byte[S]	Material data.

pas1

The pas1 section indicates start of children pane data.

Offset	Type	Description
0x00	Char[4]	Section magic. Always pas1 in ASCII.
0x04	UInt32	Size of this section in bytes.

pae1

The pas1 section indicates end of children pane data.

Offset	Type	Description
0x00	Char[4]	Section magic. Always pae1 in ASCII.
0x04	UInt32	Size of this section in bytes.

pan1

The pan1 section contains information about a null pane, a pane that isn't visible. The root pane is always a pan1 called "RootPane". Other pane sections start with this structure and then has additional data. The only difference is that the magic is changed.

Offset	Type	Description
0x00	Char[4]	Section magic. Always pan1 in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	Byte	Flag 1. xxxx xxAB: A: Influence alpha. B: Visible.
0x09	Byte	Flag 2. AABB CCDD: A: Origin X. 0 = center, 1 = left, 2 = right B: Origin Y. 0 = center, 1 = top, 2 = bottom C: Parent origin X. Same options as A. D: Parent origin Y. Same options as B.
0x0A	Byte	Pane alpha.
0x0B	Byte	Flag ex.
0x0C	String	Pane name. The string has a fixed length of 0x18, unused characters are set to 0.
0x24	String	User information, which can store information for developers. The string has a fixed length of 8, unused character are set to 0.
0x2C	Float[3]	Pane translation in X, Y and Z directions.
0x38	Float[3]	Pane rotation in X, Y and Z directions.
0x44	Float[2]	Pane scale in X and Y directions.
0x4C	Float[2]	Pane size in X and Y directions.

pic1

The pic1 section contains information about a picture pane.

Offset	Type	Description
0x54	Byte[4]	Top left vertex color in RGBA format.
0x58	Byte[4]	Top right vertex color in RGBA format.
0x5C	Byte[4]	Bottom left vertex color in RGBA format.
0x60	Byte[4]	Bottom right vertex color in RGBA format.
0x64	UInt16	Material index.
0x66	Byte	Number of UV coordinates.
0x67	Byte	Padding.

Picture UV Coordinate

Each entry has the following structure:

Offset	Type	Description
0x00	Float[2]	Top left UV coordinates.
0x08	Float[2]	Top right UV coordinates.
0x10	Float[2]	Bottom left UV coordinates.
0x08	Float[2]	Bottom right UV coordinates.

txt1

The txt1 section contains information about a text pane.

Offset	Type	Description
0x54	UInt16	Text buffer size.
0x56	UInt16	Text string length.
0x58	UInt16	Material index.
0x5A	UInt16	Font index.
0x5C	Byte	Text alignment. xxxx AABB A: Horizontal alignment. 0 = Center, 1 = Left, 2 = Right B: Vertical alignment. Same options as above.
0x5D	Byte	Line alignment: Value Description 0x00 Not specified 0x01 Left 0x02 Center 0x03 Right
0x5E	Byte	Flag 1. xxxA BBCD A: Per character transform enabled. B: Border format. 0 = standard, 1 = Delete border, 2 = Render in two cycles C: Restricted text length enabled. D: Shadow enabled.
0x5F	Byte	Padding.
0x60	Float	Italic tilt.
0x64	UInt32	Text offset, relative to the start of this pane. Links to the pane text which is stored in UTF-16 as a null-terminated string.
0x68	Byte[4]	Font top color in RGBA format.
0x6C	Byte[4]	Font bottom color in RGBA format.
0x70	Float[2]	Font XY size.
0x78	Float	Character space.
0x7C	Float	Line space.
0x80	UInt32	Textbox name offset, relative to the start of this pane. Links to the name of this textbox, stored in ASCII as a null-terminated string.
0x84	Float[2]	Shadow XY translation.
0x8C	Float[2]	Shadow XY size.
0x94	Byte[4]	Shadow top color in RGBA format.
0x98	Byte[4]	Shadow bottom color in RGBA format.
0x9C	Float	Shadow italic tilt.
If version ≥ 8.0.0.0
0xA0	UInt32	Line transform offset, relative to the start of this pane.
0xA4	UInt32	Per character transform offset, relative to the start of this pane.
Else if version ≥ 5.0.0.0
0xA0	UInt32	Per character transform offset, relative to the start of this pane.

Line Width

Unknown

Per Character Transform

Offset	Type	Description
0x00	Float	Eval time offset.
0x04	Float	Eval time width.
0x08	Byte	Loop type.
0x09	Byte	Origin V.
0x0A	Byte	Has animation info.
0x0B	Byte	Padding.

If the structure has animation info, this structure follows.

wnd1

The wnd1 pane contains information about a window pane. It is unknown how it works.

Offset	Type	Description
0x54	Int16	Inflation left.
0x56	Int16	Inflation right.
0x58	Int16	Inflation top.
0x5A	Int16	Inflation bottom.
0x5C	Int16	Frame size left.
0x5E	Int16	Frame size right.
0x60	Int16	Frame size top.
0x62	Int16	Frame size bottom.
0x64	Byte	N = Number of frames.
0x65	Byte	Window flag.
0x66	UInt16	Padding.
0x68	UInt32	Content offset, relative to the start of this pane.
0x6C	UInt32	Frame offset table offset. Links to a UInt32[N] with offsets which links to window frames. All offsets are relative to the start of the pane.

Window Content

Offset	Type	Description
0x00	Byte[4]	Top left vertex color in RGBA format.
0x04	Byte[4]	Top right vertex color in RGBA format.
0x08	Byte[4]	Bottom left vertex color in RGBA format.
0x0C	Byte[4]	Bottom right vertex color in RGBA format.
0x10	UInt16	Material index.
0x12	Byte	Number of UV coordinates.
0x13	Byte	Padding.

Window UV Coorinate

Each entry has the following structure:

Offset	Type	Description
0x00	Float[2]	Top left UV coordinates.
0x08	Float[2]	Top right UV coordinates.
0x10	Float[2]	Bottom left UV coordinates.
0x08	Float[2]	Bottom right UV coordinates.

Window Frame

Offset	Type	Description
0x00	UInt16	Material index.
0x02	Byte	Texture flip. Value Description 0x00 None 0x01 Flip U 0x02 Flop V 0x03 Rotate 90 0x04 Rotate 180 0x05 Rotate 270
0x03	Byte	Padding.

bnd1

The bnd1 section is a boundary pane. It has unknown purpose and no additional data follows the pane.

prt1

The prt1 section is a part pane.

Offset	Type	Description
0x54	UInt32	Number of properties.
0x58	Float[2]	Magnify.

The property entries follow after the header. After the entries, the part name is stored.

Part Property

Offset	Type	Description
0x00	Char[0x18]	Property name.
0x18	Byte	Usage flag.
0x19	Byte	Basic usage flag.
0x1A	Byte	Material usage flag.
0x1B	Byte	Padding.
0x1C	UInt32	Pane offset, relative to the start of this pane. Can link to a pic1 pane, a tx1 pane or a prt1 pane.
0x20	UInt32	User data offset, relative to the start of this pane.
0x24	UInt32	Pane basic info offset, relative to the start of this pane.

Pane Basic Info

Offset	Type	Description
0x00	Char[8]	User data.
0x08	Float[3]	Pane translation.
0x14	Float[3]	Pane rotation.
0x20	Float[2]	Pane scale.
0x28	Float[2]	Pane size.
0x30	Byte	Pane alpha.
0x31	Byte[3]	Padding.

grs1

The grs1 section indicates start of group children data.

Offset	Type	Description
0x00	Char[4]	Section magic. Always grs1 in ASCII.
0x04	UInt32	Size of this section in bytes.

gre1

The gre1 section indicates end of group children data.

Offset	Type	Description
0x00	Char[4]	Section magic. Always gre1 in ASCII.
0x04	UInt32	Size of this section in bytes.

grp1

The grp1 section contains information about a group.

Offset	Type	Description
0x00	Char[4]	Section magic. Always grp1 in ASCII.
0x04	UInt32	Size of this section in bytes.
If version ≥ 5.0.0.0
0x08	Char[0x21]	Group name.
0x29	Byte	Padding.
0x2A	UInt16	Number of children.
Else
0x08	Char[0x18]	Group name.
0x20	UInt16	Number of children.
0x22	UInt16	Padding.

The section follows by children names. The amount is given by "Number of children". Each string has a fixed length of 0x18, unused characters are set to 0.

cnt1

Unknown.

Offset	Type	Description
0x00	Char[4]	Section magic. Always cnt1 in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	UInt32	Control username offset, relative to the start of this pane. Points to a null-terminated string.
0x0C	UInt32	Control functional panel names offset, relative to the start of this pane. Points to an array of Char[0x18]. After that, a uint[] is stored, and points to null-terminated strings, which are control functional animation names.
0x10	UInt16	Number of control functional panels.
0x12	UInt16	Number of control functional animations.
0x14	UInt32	Control functional pane parameter name offset table offset, relative to the start of this pane. Points to a uint[], which points to null-terminated strings.
0x18	UInt32	Control functional animation parameter name offset table offset, relative to the start of this pane.Points to a uint[], which points to null-terminated strings.
0x1C	StringNT	Control name.

usd1

The usd1 section contains user data, generic data set by the creator. User data can be attached to any pane section. The user data section follows directly after the section it is attached to. User data can be attached to lyt1, all panes and cnt1.

Offset	Type	Description
0x00	Char[4]	Section magic. Always usd1 in ASCII.
0x04	UInt32	Size of this section in bytes.
0x08	UInt16	Number of user datas.
0x0A	Byte[2]	Padding.

User Data

Offset	Type	Description
0x00	UInt32	Name offset, relative to the start of this structure.
0x04	UInt32	Data offset, relative to the start of this structure.
0x08	UInt16	Number of datas stored. For type string, this is size of the string in bytes. The string is splitted by a newline character.
0x0A	Byte	User data type. Value Description 0x00 String 0x01 Int32 0x02 Float 0x03 System data (9.0.0.0)
0x0B	Byte	Padding.

String

The string is stored as a null-terminated UTF-8 string. Multiple strings can be stored, and in memory they are joined together by \ .

Int32

Each entry is a 32-bit signed integer.

Float

Each entry is a 32-bit floating-precision number.

System Data

System data is user data which has been added by the binary converter. Each entry has the following structure:

Offset	Type	Description
0x00	UInt16	Binary version.
0x02	UInt16	Number of entries.
0x04	UInt32[]	Entry offsets, relative to the start of this structure.

System Data Entry

This is only the data structure for the system data which has been seen. It has the following structure.

Offset	Type	Description
0x00	UInt32	System data type.
0x04	UInt32	Number of entries.
0x08	UInt32[]	Tage name offsets, relative to the start of this structure. All strings are null-terminated.

Version List

Version	Found in
2.2.0.0	New Super Mario Bros. U Super Mario 3D World
3.3.0.0	Mario Kart 8
5.0.0.0	Kirby and the Rainbow Curse
5.2.0.0	Mario Tennis: Ultra Smash Splatoon Super Mario Maker
8.0.0.0	1-2-Switch ARMS Mario Kart 8 Deluxe Nintendo Switch System BIOS (1.0.0 – 2.3.0) Splatoon 2 The Legend of Zelda: Breath of the Wild (Nintendo Switch)
8.2.0.0	Fire Emblem: Three Houses Nintendo Switch System BIOS (3.0.0 – 3.0.2) Super Mario Odyssey
8.3.0.0	Captain Toad: Treasure Tracker (Nintendo Switch) Game Builder Garage Mario Party Superstars Mario Tennis Aces New Super Mario Bros U. Deluxe Nintendo Labo - Toy-Con 01: Variety Kit Nintendo Labo - Toy-Con 02: Robot Kit Nintendo Labo - Toy-Con 03: Vehicle Kit Nintendo Labo - Toy-Con 04: VR Kit Nintendo Switch System BIOS (4.0.1 – 4.1.0) Pikmin 3 Deluxe Super Mario Party Sushi Striker: The Way of Sushido (Nintendo Switch)
8.5.0.0	Nintendo Switch System BIOS (5.0.2 – 5.1.0)
8.6.0.0	Nintendo Switch System BIOS (6.0.0 – 6.2.0) Pokémon: Let's Go, Eevee! Pokémon: Let's Go, Pikachu! Tetris 99
9.0.0.0	Animal Crossing: New Horizons Big Brain Academy: Brain vs. Brain Clubhouse Games: 51 Worldwide Classics Dr Kawashima's Brain Training for Nintendo Switch Everybody 1-2-Switch! F-ZERO 99 Kirby's Dream Buffet Kirby Figthers 2 Momotaro Dentetsu: Showa, Heisei, Reiwa mo Teiban! Nintendo Switch Sports Nintendo Switch System BIOS (7.0.0 – 8.1.0) Nintendo World Championships: NES Edition PAC-MAN 99 Pokémon Legends: Arceus Pokémon Scarlet Pokémon Shield Pokémon Sword Pokémon Violet Ring Fit Adventure Splatoon 3 Super Kirby Clash Super Mario 3D World + Bowser's Fury Super Mario 3D All-Stars Super Mario Bros. Wonder Super Mario Maker 2 The Legend Of Zelda: Link's Awakening The Legend of Zelda: Tears of the Kingdom WarioWare: Get It Together! WarioWare: Move It!

Tools

The following tool can handle BFLYT files:

• BenzinU, by diddy81
• Wexos's Toolbox, by Wexos