View source for BTI

[[Category:File formats]]
BTI is an image file format similar to TEX0, TPL and BREFT file formats. The only difference is the file header.

__TOC__

== File Format ==
The file format is very simple and starts with a file header followed by the image data. All data is written in [[big endian]].

=== File Header ===
The following table shows the file header. It is 0x20 bytes long. There is no magic to identify BTI files,
so tools may do some plausibility checks to identify them.

{| class="textbox grid alt center" style="border:1px; solid:#aaaaaa; max-width:743px" rules=all
|- style=background:lightgray
! colspan=3 | File Header (''Table inspired off of [http://wiki.tockdom.com/wiki/BTI_(File_Format)#File_Header this]''')
|- style=background:#f2f2f2
! Offset !! Type !! Description
|-
| 0x00 || Byte || '''Image format'''
|-
| 0x01 || Byte || '''Enable alpha''' (0x00 means alpha is disabled, anything higher means alpha is enabled)
|-
| 0x02 || UInt16 || '''Width''' of the image in pixels
|-
| 0x04 || UInt16 || '''Height''' of the image in pixels
|-
| 0x06 || Byte || '''Wrap S'''[http://www.amnoid.de/gc/bti.txt] (0x01 for posteffect.bti, 0x00 for others). Probably repeat, clamp or mirror wraps for U projection maps
|-
| 0x07 || Byte || '''Wrap T'''[http://www.amnoid.de/gc/bti.txt] (0x01 for posteffect.bti, 0x00 for others). Probably repeat, clamp or mirror wraps for V projection maps
|-
| 0x08 || UInt16 || '''Palette format'''
|-
| 0x0A || UInt16 || '''Number of palette entries'''
|-
| 0x0C || UInt32 || '''Offset to palette data''', relative to the start of the file header
|-
| 0x10 || Boolean || '''Mipmap Enable''' Whether the texture will use mipmaps or not
|-
| 0x11 || Boolean || '''EnableEdgeLOD''' 
|-
| 0x12 || Boolean || '''Clamp LOD Bias''' 
|-
| 0x13 || Boolean || '''Max Anisotropy''' 
|-
| 0x14 || Byte || '''Minification filter type'''
|-
| 0x15 || Byte || '''Magnification filter type'''
|-
| 0x16 || Byte || '''Min LOD''' The minimum LOD clamp, scaled by 8. Usually 0 so the 0th Mipmap level is used.
|-
| 0x17 || Byte || '''Max LOD''' The maximum LOD clamp, scaled by 8. This should practically have the same value as MipmapCount.
|-
| 0x18 || Byte || '''Total number of images''', thus number of mipmaps + 1. Apparently unread by the engine itself, it only uses the MipmapEnable flag and the max LOD field.
|-
| 0x19 || Byte || style=background:lightgray | '''Unknown''' Probably Padding
|-
| 0x1A || UInt16 || '''LOD Bias''' The LOD bias of the texture, scaled by 100.
|-
| 0x1C || UInt32 || '''Offset to image data''', relative to the start of the file header
|-
| 0x20 || colspan=2 style="background:lightgray; text-align:center;" | End of file header
|}

== Palette Data ==
{| class="textbox grid alt center" style="border:1px; solid:#0000a0; max-width:743px;" rules=all
|-
! colspan=7 style="background:#000080; color:white;" | Image Formats (''Table inspired off of [http://wiki.tockdom.com/wiki/Template:Image_Formats this])
|- style="background:#b0b0f0"
! ID !! Name !! Bits per pixel !! Block width !! Block height !! Block size !! Type
|- style="background:#d0d0f0"
| 0x00 || I4 || 4 || 8 || 8 || 32 bytes || Gray
|- style="background:#f0f0ff"
| 0x01 || I8 || 8 || 8 || 4 || 32 bytes || Gray
|- style="background:#d0d0f0"
| 0x02 || IA4 || 8 || 8 || 4 || 32 bytes || Gray + Alpha
|- style="background:#f0f0ff"
| 0x03 || IA8 || 16 || 4 || 4 || 32 bytes || Gray + Alpha
|- style="background:#d0d0f0"
| 0x04 || RGB565|| 16 || 4 || 4 || 32 bytes || Color
|- style="background:#f0f0ff"
| 0x05 || RGB5A3 || 16 || 4 || 4 || 32 bytes || Color + Alpha
|- style="background:#d0d0f0"
| 0x06 || RGBA32|| 32 || 4 || 4 || 64 bytes || Color + Alpha
|- style="background:#f0f0ff"
| 0x08 || C4 || 4 || 8 || 8 || 32 bytes || Palette (IA8, RGB565, RGB5A3)
|- style="background:#d0d0f0"
| 0x09 || C8|| 8 || 8 || 4 || 32 bytes || Palette (IA8, RGB565, RGB5A3)
|- style="background:#f0f0ff"
| 0x0A || C14X2 || 16 || 4 || 4 || 32 bytes || Palette (IA8, RGB565, RGB5A3)
|- style="background:#d0d0f0"
| 0x0E || CMPR || 4 || 8 || 8 || 32 bytes || Color + 1 bit Alpha (compressed)
|}

= Tools =
[http://avsys.xyz/upload/files/Wexos%27s%20Toolbox%20v1.0.2.0.zip Wexos's Toolbox] can convert PNG files into BTI images. (Only supports certain pallets.)<br>
[https://szs.wiimm.de/ Wiimms SZS Tools] can convert BTI and PNG images in any direction. It may also convert the image and palette formats and add or remove mipmaps on the fly.<br>
[https://github.com/KillzXGaming/Switch-Toolbox Switch Toolbox] can open BTI images and convert them into PNG files.
<br>
[https://github.com/Lord-Giganticus/BTIConv BTIConv] is a cross platform solution to convert BTI and PNG images in any direction. Built in NET 6.0
== Libraries ==
[https://github.com/SuperHackio/Hack.io/tree/master/Hack.io.BTI Hack.io.BTI] Windows only C# library to help manipulating BTI images