Editing GXT

[[Category:Software]]<noinclude>[[Category:Main]]</noinclude>

<div style="float:right">[[File:Texture-Icon-BB.JPG|100px|thumb|left|Standard test image widely used]]</div>

<div style="color: #ffffff; background-color: #475854; border: 1px solid #808000; padding: 5px; {{box-shadow|4px|4px|8px|#b0b090}}">
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. 
</div>

== 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 consists of:

{| class="wikitable" style="text-align: center;"
|-
! style="background-color:#475854; color:#FFFFFF;" |'''File Layout'''
|-
| style="background-color:lightblue; color:#000000;" |'''GXT Header'''
|-
| style="background-color:lightblue; color:#000000;" |'''GXT Specification Texture 1 info'''
|-
| style="background-color:lightblue; color:#000000;" |'''GXT Specification Texture 2 info'''
|-
| style="background-color:lightblue; color:#000000;" |'''...''' 
|-
| style="background-color:lightblue; color:#000000;" |'''Texture 1'''
|-
| style="background-color:lightblue; color:#000000;" |'''Padding'''
|-
| style="background-color:lightblue; color:#000000;" |'''Texture 2'''
|-
| style="background-color:lightblue; color:#000000;" |'''...''' 
|-
| style="background-color:lightblue; color:#000000;" |'''Palette P4''' 
|-
| style="background-color:lightblue; color:#000000;" |'''Palette P8''' 
|-
|}

*For a single texture:

{| class="wikitable" style="text-align: center;"
|-
| style="background-color:#475854; color:#FFFFFF;" |'''Offset (h)'''
| style="background-color:#475854; color:#FFFFFF;" |'''Size (h)'''
| style="background-color:#475854; color:#FFFFFF;" |'''Example (h)'''
| style="background-color:#475854; color:#FFFFFF;" |'''Value (conversion)''' 
| style="background-color:#475854; color:#FFFFFF;" |'''Notes'''
|-
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">GXT header</span>
|-
| 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 || 0x40 || Offset of the texture data/ header size
|-
| 0x10 || 0x04 || 00 00 02 00 || 0x20000 || Total size of the Textures
|-
| 0x14 || 0x04 || 00 00 00 00 || 0 || Number of 16 entry palettes (P4)
|-
| 0x18 || 0x04 || 00 00 00 00 || 0 || Number of 256 entry palettes (P8)
|-
| 0x1C || 0x04 || 00 00 00 00 || 0 || Padding
|-
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">GXT specification per texture</span>
|-
| 0x20 || 0x04 || 40 00 00 00 || 0x40 || Offset of the single texture data
|-
| 0x24 || 0x04 || 00 00 02 00 || 0x20000 || 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 || 00 00 00 85 || 0x85000000 || Texture Base Format
|-
| 0x38 || 0x02  || 00 02 || 0x200 (512) || Width
|-
| 0x3A || 0x02  || 00 02 || 0x200 (512) || Height
|-
| 0x3C || 0x02 || - || - || Mipmaps
|-
| 0x3E || 0x02 || - || - || Not Used?/Padding
|-
|}

=== Texture type ===

{| class="wikitable" style="text-align: center;"
|-
| style="background-color:#475854; color:#FFFFFF;" |'''Name'''
| style="background-color:#475854; color:#FFFFFF;" |'''Value (h)'''
| style="background-color:#475854; color:#FFFFFF;" |'''Description'''
|-
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">Texture Type</span>
|-
| SWIZZLED || 0x00 || 
|-
| CUBE || 0x40 || 
|-
| LINEAR || 0x60 || 
|-
| TILED || 0x80 || 
|-
| LINEAR STRIDED || 0x0C || 
|-
|}

=== Texture Base Format ===

{| class="wikitable" style="text-align: center;"
|-
| style="background-color:#475854; color:#FFFFFF;" |'''Name'''
| style="background-color:#475854; color:#FFFFFF;" |'''Value (h)'''
| style="background-color:#475854; color:#FFFFFF;" |'''Description'''
|-
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">Texture Base Format</span>
|-
| PVRT2BPP || 0x80 || PVR 2 bits per pixel mode
|-
| PVRT4BPP || 0x81 || PVR 4 bits per pixel mode
|-
| PVRTII2BPP || 0x82 || PVR II 2 bits per pixel mode
|-
| PVRTII4BPP || 0x83 || PVR II  4 bits per pixel mode
|-
| UBC1 || 0x85 || DXT1 4 bits per pixel
|-
| UBC2 || 0x86 || DXT3 8 bits per pixel
|-
| UBC3 || 0x87 || DXT5 8 bits per pixel
|-
|}

*[[PVR|PVR file format]]
*[[DXT|DXT file format]]