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| ''See [[TXTR (File Format)]] for the other revisions of this format.''
| | The '''PART format''' controls particles. The format is nearly entirely unknown. |
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| '''TXTR''' is, as the name suggests, the Retro Studios texture format. The format remains completely unchanged from Metroid Prime all the way up to Donkey Kong Country Returns.
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| {{todo|Could possibly use some more information on how the formats work and how to decode them, but then again the Custom Mario Kart Wiiki has this covered pretty nicely already.}}
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| __TOC__
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| == Format ==
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| TXTR files contain a very short 12-byte header, followed by the image data.
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| === Header ===
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| {| class="wikitable"
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| ! Offset
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| ! Size
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| ! Description
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| |-
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| | 0x0
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| | 4
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| | '''Image format'''. Possible values range from 0x0 to 0xA; see below for more details.
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| |-
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| | 0x4
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| | 2
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| | '''Width'''
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| |-
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| | 0x6
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| | 2
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| | '''Height'''
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| |-
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| | 0x8
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| | 4
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| | '''Mipmap count'''
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| |-
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| | 0xC
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| | colspan=2 {{unknown|End of header}}
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| |}
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| === Palettes ===
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| The C4 and C8 image formats contain a palette table after the header, before the image data begins. | |
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| {| class="wikitable"
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| ! Offset
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| ! Size
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| ! Description
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| |-
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| | 0x0
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| | 4
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| | '''Palette format'''. Possible values range from 0 to 2.
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| |-
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| | 0x4
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| | 2
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| | '''Width'''. always 1 in C4, 256 in C8
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| |-
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| | 0x6
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| | 2
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| | '''Height'''. always 16 in C4, 1 in C8
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| |-
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| | 0x8
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| | Varies
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| | '''Palette colors'''. 16-bit color values; 16 colors in C4, 256 in C8.
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| |-
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| | colspan=3 {{unknown|End of palette table; image data begins immediately after}}
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| |}
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| == Image Formats ==
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| There are 11 different image formats supported by the hardware. Rather than storing pixels in a linear left-to-right order, GameCube textures are swizzled in blocks. Blocks are 32 bytes large (except for RGBA8), with their dimensions varying depending on the BPP of the image format.
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| For example, suppose you have a format that stores 4x4 blocks. Pixels 1-4 of the image will make up the first row of the first block; pixels 5-8 will make up the second row; 9-12 will make up the third row; 13-16 will make up the fourth row, completing the block; and then 17-20 will begin the first row of the second block, appearing directly to the right of the first row of the first block.
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| {| class="wikitable"
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| ! ID
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| ! Name
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| ! Bits per pixel
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| ! Block size
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| ! Description
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| |-
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| | 0x0
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| | I4
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| | 4
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| | 8x8
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| | 4-bit greyscale intensity values. Two pixels per byte.
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| |-
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| | 0x1
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| | I8
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| | 8
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| | 8x4
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| | 8-bit greyscale intensity values.
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| |-
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| | 0x2
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| | IA4
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| | 8
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| | 8x4
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| | 4-bit greyscale intensity values with an additional 4-bit alpha channel.
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| |-
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| | 0x3
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| | IA8
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| | 16
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| | 4x4
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| | 8-bit greyscale intensity values with an additional 8-bit alpha channel.
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| |-
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| | 0x4
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| | C4
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| | 4
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| | 8x8
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| | 4-bit palette indices.
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| |-
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| | 0x5
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| | C8
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| | 8
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| | 8x4
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| | 8-bit palette indices.
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| |-
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| | 0x6
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| | C14x2
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| | 16
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| | 4x4
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| | Another palette format. Not used by any official textures.
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| |-
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| | 0x7
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| | RGB565
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| | 16
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| | 4x4
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| | 16-bit colors without alpha.
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| |-
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| | 0x8
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| | RGB5A3
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| | 16
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| | 4x4
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| | 16-bit colors with alpha.
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| |-
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| | 0x9
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| | RGBA8
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| | 32
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| | 4x4
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| | Uncompressed 32-bit colors with alpha.
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| |-
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| | 0xA
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| | CMPR
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| | 4
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| | 8x8
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| | Compressed textures (almost the same as DXT1, but with a couple small differences)
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| |}
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| == External links ==
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| * [http://wiki.tockdom.com/wiki/Image_Formats Custom Mario Kart Wiki]: More detailed information on each format, and how to decode them.
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| [[Category:File Formats]] | | [[Category:File Formats]] |