Difference between revisions of "BTI file"

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(Created page with "A form of 2d data the can be opened in gcft {{Credits|Gamecubing8619}}")
 
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A form of 2d data the can be opened in gcft
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'''BTI''' is an image file format similar to [[TEX0]], [[TPL]] and [[BREFT]] file formats. The only difference is the file header.
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{{Credits|Gamecubing8619}}
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__TOC__
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== Appearance in Mario Kart Wii ==
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BTI files are used rarely in [[Mario Kart Wii]]. They can be found in some tracks with 3 different file names:
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* [http://szs.wiimm.de/cgi/mkw/track-ref/course.btienv#info course.btiEnv]
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* [http://szs.wiimm.de/cgi/mkw/track-ref/course.btimat#info course.btiMat]
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* [http://szs.wiimm.de/cgi/mkw/track-ref/posteffect/posteffect.bti#info posteffect/posteffect.bti]
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== File Format ==
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The file format is very simple and starts with a file header followed by the image data. All data is written in [[big endian]].
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=== File Header ===
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The following table shows the file header. It is 0x20 bytes long. There is no magic to identify BTI files,
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so tools may do some plausibility checks to identify them.
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{| class="wikitable"
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|+ File Header
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|-
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! Offset !! Type !! Description
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|-
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| 0x00 || Byte || '''[[Image Formats|Image format]]'''.
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|-
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| 0x01 || Byte || '''Enable alpha''' (0x00 means alpha is disabled, anything higher means alpha is enabled).
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|-
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| 0x02 || UInt16 || '''Width''' of the image in pixels.
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|-
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| 0x04 || UInt16 || '''Height''' of the image in pixels.
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|-
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| 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.
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|-
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| 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.
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|-
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| 0x08 || UInt16 || '''[[Image Formats#Palette_Formats|Palette format]]''' (not used in [[Mario Kart Wii]]).
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|-
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| 0x0A || UInt16 || '''Number of palette entries'''.
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|-
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| 0x0C || UInt32 || '''Offset to [[#Image and Palette Data|palette data]]''', relative to the start of the file header.
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|-
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| 0x10 || UInt32 || {{Unknown-left|'''Unknown'''.}} Always 0 in [[Mario Kart Wii]].
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|-
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| 0x14 || Byte || '''Magnification filter type''' (0x00 means nearest, 0x01 means linear).
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|-
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| 0x15 || Byte || '''Minification filter type'''.
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|-
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| 0x16 || UInt16 || {{Unknown-left|'''Unknown'''.}} Always 0 in [[Mario Kart Wii]].
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|-
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| 0x18 || Byte || '''Total number of images''', thus number of mipmaps + 1.
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|-
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| 0x19 || Byte || {{Unknown-left|'''Unknown'''.}} Always 0 in [[Mario Kart Wii]].
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|-
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| 0x1A || UInt16 || {{Unknown-left|'''Unknown'''.}} Always 0 in [[Mario Kart Wii]].
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|-
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| 0x1C || UInt32 || '''Offset to [[#Image and Palette Data|image data]]''', relative to the start of the file header.
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|-
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| 0x20 || colspan=2 {{unknown|End of file header}}
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|}
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=== Image and Palette Data ===
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The image and palette data starts at the given data offset in the file header.
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The data depends on the image and palette formats format.
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The image format values are listed below.
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{{Image Formats}}
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{{Credits|Gamecubing8619,vulcan,wiki.tockdom.com}}

Revision as of 04:55, 9 March 2024

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


Appearance in Mario Kart Wii

BTI files are used rarely in Mario Kart Wii. They can be found in some tracks with 3 different file names:

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.

File Header
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[1] (0x01 for posteffect.bti, 0x00 for others). Probably repeat, clamp or mirror wraps for U projection maps.
0x07 Byte Wrap T[2] (0x01 for posteffect.bti, 0x00 for others). Probably repeat, clamp or mirror wraps for V projection maps.
0x08 UInt16 Palette format (not used in Mario Kart Wii).
0x0A UInt16 Number of palette entries.
0x0C UInt32 Offset to palette data, relative to the start of the file header.
0x10 UInt32 Template:Unknown-left Always 0 in Mario Kart Wii.
0x14 Byte Magnification filter type (0x00 means nearest, 0x01 means linear).
0x15 Byte Minification filter type.
0x16 UInt16 Template:Unknown-left Always 0 in Mario Kart Wii.
0x18 Byte Total number of images, thus number of mipmaps + 1.
0x19 Byte Template:Unknown-left Always 0 in Mario Kart Wii.
0x1A UInt16 Template:Unknown-left Always 0 in Mario Kart Wii.
0x1C UInt32 Offset to image data, relative to the start of the file header.
0x20 colspan=2 End of file header[unsure]

Image and Palette Data

The image and palette data starts at the given data offset in the file header. The data depends on the image and palette formats format. The image format values are listed below.

Template:Image Formats




Credits: Gamecubing8619,vulcan,wiki.tockdom.com
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