CSKR (File Format) and TXTR (Metroid Prime): Difference between pages
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The ''' | '''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. | ||
__TOC__ | |||
== Format == | |||
TXTR files contain a very short 12-byte header, followed by the image data. | |||
=== Header === | |||
{| class="wikitable" | |||
! Offset | |||
! Size | |||
! Description | |||
|- | |||
| 0x0 | |||
| 4 | |||
| '''Image format'''. Possible values range from 0x0 to 0xA; see below for more details. | |||
|- | |||
| 0x4 | |||
| 2 | |||
| '''Width''' | |||
|- | |||
| 0x6 | |||
| 2 | |||
| '''Height''' | |||
|- | |||
| 0x8 | |||
| 4 | |||
| '''Mipmap count''' | |||
|- | |||
| 0xC | |||
| colspan=2 | End of header | |||
|} | |||
=== Palettes === | |||
The C4 and C8 image formats contain a palette table after the header, before the image data begins. | |||
{| class="wikitable" | |||
! Offset | |||
! Size | |||
! Description | |||
|- | |||
| 0x0 | |||
| 4 | |||
| '''Palette format'''. Possible values range from 0 to 2. | |||
|- | |||
| 0x4 | |||
| 2 | |||
| Always 0x1 in C4, 0x100 in C8 | |||
|- | |||
| 0x6 | |||
| 2 | |||
| Always 0x10 in C4, 0x1 in C8 | |||
|- | |||
| 0x8 | |||
| Varies | |||
| '''Palette colors'''. 16-bit color values; 16 colors in C4, 256 in C8. | |||
|- | |||
| colspan=3 | End of palette table; image data begins immediately after | |||
|} | |||
== Image Formats == | |||
There are 11 different image formats; these are built directly into GX, so they remain the same across all GameCube and Wii games. Rather than storing pixels in a linear left-to-right order, GX textures encode pixels in large blocks. The size of the block varies depending on the image format. | |||
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 the 17-20 will begin the first row of the second block, appearing directly to the right of the first row of the first block. | |||
{| class="wikitable" | |||
! ID | |||
! Name | |||
! Bits per pixel | |||
! Block size | |||
! Description | |||
|- | |||
| 0x0 | |||
| I4 | |||
| 4 | |||
| 8x8 | |||
| 4-bit greyscale intensity values. Two pixels per byte. | |||
|- | |||
| 0x1 | |||
| I8 | |||
| 8 | |||
| 8x4 | |||
| 8-bit greyscale intensity values. | |||
|- | |||
| 0x2 | |||
| IA4 | |||
| 8 | |||
| 8x4 | |||
| 4-bit greyscale intensity values with an additional 4-bit alpha channel. | |||
|- | |||
| 0x3 | |||
| IA8 | |||
| 16 | |||
| 4x4 | |||
| 8-bit greyscale intensity values with an additional 8-bit alpha channel. | |||
|- | |||
| 0x4 | |||
| C4 | |||
| 4 | |||
| 8x8 | |||
| 4-bit palette indices. | |||
|- | |||
| 0x5 | |||
| C8 | |||
| 8 | |||
| 8x4 | |||
| 8-bit palette indices. | |||
|- | |||
| 0x6 | |||
| C14x2 | |||
| 16 | |||
| 4x4 | |||
| Another palette format. Not used by any official textures. | |||
|- | |||
| 0x7 | |||
| RGB565 | |||
| 16 | |||
| 4x4 | |||
| 16-bit colors without alpha. | |||
|- | |||
| 0x8 | |||
| RGB5A3 | |||
| 16 | |||
| 4x4 | |||
| 16-bit colors with alpha. | |||
|- | |||
| 0x9 | |||
| RGBA8 | |||
| 32 | |||
| 4x4 | |||
| Uncompressed 32-bit colors with alpha. | |||
|- | |||
| 0xA | |||
| CMPR | |||
| 4 | |||
| 8x8 | |||
| DXT1-compressed textures. | |||
|} | |||
== External links == | |||
* [http://wiki.tockdom.com/wiki/Image_Formats Custom Mario Kart Wiiki]: More detailed information on each format, and how to decode them. | |||
[[Category:File Formats]] | [[Category:File Formats]] | ||