Filetype:MIP Texture Format
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About
MIP is a texture format used in LittleBigPlanet Portable.
Format
A MIP file has no file magic, and can only be detected by heuristics. It is stored within an Encrypted PSP Container.
Header[1]
| Offset | Name | Data Type |
|---|---|---|
| 0x00 | Color Lookup Table Offset | u32 |
| 0x04 | Image Width | u32 |
| 0x08 | Image Height | u32 |
| 0x0C | Bits per pixel | u8 |
| 0x0D | Number of Blocks | u8 |
| 0x0E | Texture mode | u8 |
| 0x0F | Alpha | u8 |
| 0x10 | Data Offset | u32 |
Only 4bpp and 8bpp are known to be valid. It is unknown what Number of Blocks and Texture mode are used for, they can be ignored when reading, and set to "2" and "1" respectively when writing. Alpha is "0" or "1", representing a boolean value of whether or not the image contains alpha.
Color Lookup Table
The Color Lookup Table is a 16 (if 4bpp) or 256 (if 8bpp) entry table containing all the colors used in the image. Each entry is 4 bytes wide, using a simple RGBA8888 layout. Each entry is tightly packed. It is located at the offset specified in the header.
| Name | Data Type |
|---|---|
| R | u8 |
| G | u8 |
| B | u8 |
| A | u8 |
Image Data
Image data is stored uncompressed in the file at the offset specified in the header. In an 8bpp file, every byte is an index into the color lookup table, representing a single pixel. In a 4bpp file, every byte represents a two pixel horizontal strip, with the 4 least significant bits representing the color lookup table offset for the leftmost pixel, and the most significant 4 bits representing the color lookup table offset for the rightmost pixel. The game expects the image data to be swizzled[2][3][4].
MIP files uploaded to the PSP UGC server are always flipped vertically.