GXT: Difference between revisions

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| 0x0C || 0x04 || 40 00 00 00 || 40 || Offset of the texture data/ header size
| 0x0C || 0x04 || 40 00 00 00 || 40 || Offset of the texture data/ header size
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| 0x10 || 0x04 || 80 00 00 00 || 80 || Texture (total?) size
| 0x10 || 0x04 || 80 00 00 00 || 80 || Total size of the Textures
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| 0x14? || 0x04 || 00 00 00 00 || || Number of 16 entry palettes
| 0x14 || 0x04 || 00 00 00 00 || 0 || Number of 16 entry palettes
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| 0x18? || 0x04 || 00 00 00 00 || || Number of 256 entry palettes
| 0x18 || 0x04 || 00 00 00 00 || 0 || Number of 256 entry palettes
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| 0x18 || 0x08 || 00 ... 00   || - || Padding
| 0x1C || 0x04 || 00 00 00 00 || 0 || Padding
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| 0x20 || 0x04  || 40 00 00 00 || 40 || Offset to the (single first?) texture data relative to the start of the file
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">GXT specification per texture?</span>
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| 0x24 || 0x04 || 80 00 00 00 || 80 || Texture (single first?) size
| 0x20 || 0x04 || 40 00 00 00 || 40 || Offset of the single texture data
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|-
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">GXT specification per texture?</span>
| 0x24 || 0x04 || 80 00 00 00 || 80 || Size of the single texture data.
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| 0x28 || 0x04 || FF FF FF FF || - || Parent?
| 0x28 || 0x04 || FF FF FF FF || - || Index of the palette
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| 0x2C || 0x04 || 00 00 00 00 || - ||  
| 0x2C || 0x04 || 00 00 00 00 || - || Texture flags/Not used?
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| 0x30 || 0x07 || - || - || Flags
| 0x30 || 0x04 || 00 00 00 00 || - || Texture Type
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| 0x37 || 0x01? || - || - || Flags: Texture format
| 0x34 || 0x04 || - || - || Texture format
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| 0x38 || 0x02? || - || - || Height: ?
| 0x38 || 0x02  || - || - || Width
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| 0x3A || 0x02? || - || - || Width:?
| 0x3A || 0x02  || - || - || Height
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| 0x3C || 0x02? || - || - || Depth:?
| 0x3C || 0x02 || - || - || Mipmaps
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| 0x3E || 0x02? || - || - ||  
| 0x3E || 0x02 || - || - || Not Used?/Padding
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|}
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Revision as of 19:45, 29 July 2015


Standard test image widely used

GXT is a file format (used on PS Vita and PSP) for storing textures. The purpose of this format is to use it in the runtime without any additional formatting of the data.

Features

  • Memory ready format
  • Supports multiple textures in one file
  • Supports compressed, swizzled, and linear texture layouts
  • Supports mipmaps
  • Suports palettized textures

File format

The GXT (.gxt) format (older version might vary) consists of:

Header (for single texture):

Offset (h) Size (h) Example (h) Value (conversion) Notes
GXT header
0x00 0x04 47 58 54 00 "GXT " Magic
0x04 0x04 03 00 00 10 3.01 Version
0x08 0x04 01 00 00 00 1 Number of textures embedded
0x0C 0x04 40 00 00 00 40 Offset of the texture data/ header size
0x10 0x04 80 00 00 00 80 Total size of the Textures
0x14 0x04 00 00 00 00 0 Number of 16 entry palettes
0x18 0x04 00 00 00 00 0 Number of 256 entry palettes
0x1C 0x04 00 00 00 00 0 Padding
GXT specification per texture?
0x20 0x04 40 00 00 00 40 Offset of the single texture data
0x24 0x04 80 00 00 00 80 Size of the single texture data.
0x28 0x04 FF FF FF FF - Index of the palette
0x2C 0x04 00 00 00 00 - Texture flags/Not used?
0x30 0x04 00 00 00 00 - Texture Type
0x34 0x04 - - Texture format
0x38 0x02 - - Width
0x3A 0x02 - - Height
0x3C 0x02 - - Mipmaps
0x3E 0x02 - - Not Used?/Padding
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