GXT
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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 | Texture (total?) size |
| 0x14? | 0x04 | 00 00 00 00 | Number of 16 entry palettes | |
| 0x18? | 0x04 | 00 00 00 00 | Number of 256 entry palettes | |
| 0x18 | 0x08 | 00 ... 00 | - | Padding |
| 0x20 | 0x04 | 40 00 00 00 | 40 | Offset to the (single first?) texture data relative to the start of the file |
| 0x24 | 0x04 | 80 00 00 00 | 80 | Texture (single first?) size |
| GXT specification per texture? | ||||
| 0x28 | 0x04 | FF FF FF FF | - | Parent? |
| 0x2C | 0x04 | 00 00 00 00 | - | |
| 0x30 | 0x07 | - | - | Flags |
| 0x37 | 0x01? | - | - | Flags: Texture format |
| 0x38 | 0x02? | - | - | Height: ? |
| 0x3A | 0x02? | - | - | Width:? |
| 0x3C | 0x02? | - | - | Depth:? |
| 0x3E | 0x02? | - | - | |