Editing GXT

Jump to navigation Jump to search
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then publish the changes below to finish undoing the edit.

Latest revision Your text
Line 1: Line 1:
[[Category:Software]]<noinclude>[[Category:Main]]</noinclude>
[[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}}">
<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.  
Gxt is a container for storing one or multiple graphic textures for the PSVita and PSP.
</div>
</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 ==
== File format ==
The GXT (.gxt) format consists of:
The GXT (.gxt) format consists of:


{| class="wikitable" style="text-align: center;"
Header (for single texture):
|-
! 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;"
{| class="wikitable" style="text-align: center;"
Line 58: Line 22:
| 0x00 || 0x04 || 47 58 54 00 || "GXT " || Magic
| 0x00 || 0x04 || 47 58 54 00 || "GXT " || Magic
|-
|-
| 0x04 || 0x04 || 03 00 00 10 || 3.01 || Version
| 0x04 || 0x04 || 03 00 00 10 || || 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?
| 0x08 || 0x04 || 01 00 00 00 || 40 || Number of textures embedded
|-
|-
| 0x30 || 0x04 || 00 00 00 00 || - || Texture Type
| 0x0C || 0x04 || 40 00 00 00 || 40 || Offset of the texture data
|-
|-
| 0x34 || 0x04 || 00 00 00 85 || 0x85000000 (DXT1) || Texture Base Format
| 0x10 || 0x04 || 00 00 00 80 || || Number of 16 entry palettes
|-
|-
| 0x38 || 0x02  || 00 02 || 0x200 (512) || Width
| 0x14 || 0x04 || 00 00 00 00 || || Number of 256 entry palettes
|-
|-
| 0x3A || 0x02  || 00 02 || 0x200 (512) || Height
| 0x18 || 0x08 || 00 ... 00  || 00 || Padding
|-
|-
| 0x3C || 0x02 || - || - || Mipmaps
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">GXT specification</span>
|-
|-
| 0x3E || 0x02 || - || - || Not Used?/Padding
| 0x20 || 0x04  || 40 00 00 00 || 40 || Offset to the texture data relative to the start of the file
|-
|-
|}
|}
=== 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 || 00 00 00 80 || PVR 2 bits per pixel mode
|-
| PVRT4BPP || 00 00 00 81 || PVR 4 bits per pixel mode
|-
| PVRTII2BPP || 00 00 00 82 || PVR II 2 bits per pixel mode
|-
| PVRTII4BPP || 00 00 00 83 || PVR II  4 bits per pixel mode
|-
| UBC1 || 00 00 00 85 || DXT1 4 bits per pixel, no alpha
|-
| UBC2 || 00 00 00 86 || DXT3 8 bits per pixel
|-
| UBC3 || 00 00 00 87 || DXT5 8 bits per pixel
|-
| || 10 00 04 00 || 1555
|-
| || 00 00 00 10 || ARGB4444
|-
| || 00 10 00 0C || ARGB8888
|-
| || 00 50 00 0C || XRGB888
|-
| || 00 10 00 98 || RGB888
|-
| || 00 10 00 05 || RGB565
|-
| || 00 50 00 04 || RGB555
|-
| || 00 10 00 02 || RGB4444
|-
|}
*[[PVR|PVR file format]]
*[[DXT|DXT file format]]
Please note that all contributions to Vita Developer wiki are considered to be released under the GNU Free Documentation License 1.2 (see Vita Developer wiki:Copyrights for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource. Do not submit copyrighted work without permission!

To protect the wiki against automated edit spam, we kindly ask you to solve the following hCaptcha:

Cancel Editing help (opens in new window)

Template used on this page: