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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 32:
| 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
| 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
| 0x0C || 0x04 || 40 00 00 00 || 40 || Offset of the texture data
|-
| 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 (DXT1) || 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 || 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
| 0x10 || 0x04 || 00 00 00 80 ||  || Number of 16 entry palettes
|-
|-
| UBC1 || 00 00 00 85 || DXT1 4 bits per pixel, no alpha
| 0x14 || 0x04 || 00 00 00 00 ||  || Number of 256 entry palettes
|-
|-
| UBC2 || 00 00 00 86 || DXT3 8 bits per pixel
| 0x18 || 0x08 || 00 ... 00   || 00 || Padding
|-
|-
| UBC3 || 00 00 00 87 || DXT5 8 bits per pixel
|colspan="5" style="text-align:center; background-color:lightblue;" | <span style="color:black;">GXT specification</span>
|-
|-
| || 10 00 04 00 || 1555
| 0x20 || 0x04  || 40 00 00 00 || 40 || Offset to the texture data relative to the start of the file
|-
| || 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]]
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