intro

TextHeader.bin is created by Binpbo personal edition 2.5 and greater. It is placed in the primary folder of the addon.pbo, and comprises of information from all pax files encountered in that addon from all it's possible data trees.

Information here has been gleaned from the very few texheaders in Arrowhead (approx 24) and won't necessarily be complete as a result.

Conventions

see Generic FileFormat Data Types

File Structure

struct TexHeader.bin
{
 MimeType "0DHT" ;    // NOT asciiz. '0' = 0x30. This is mimetype "TexHeaDer0"
 ulong    version;    // 1
 ulong    nTextures;  // 
 TexBody  TexBodies[nTextures];
};

TexBody

TexBody
{
 ulong          nColorPallets;      //always 1
 ulong          Pallet_ptr;         //Always0 (there are none)
 floats         AverageColor[r,g,b,a];//AVGCTAGG floating-point equivalent.
 bytes          AverageColor[b,g,r,a];//AVGCTAGG in PAx file 
 bytes          MaxColor[b,g,r,a];    //MAXCTAGG in PAx file
 ulong          clampflags;         // always 0
 ulong          transparentColor;   // always 0xFFFFFFFF
 byteBool       has_maxCtagg;       // the MaxColor was set by the paa
                isAlpha;	     // set if FLAGTAG=1: 'basic transparency'
                isTransparent;	     // set if FLAGTAG=2: 'alpha channel is not interpolated'
                isAlphaNonOpaque;   // set if isalpha, AND AverageColor alpha <0x80
 ulong          nMipmaps;           // always same as nMipmapsCopy below
 ulong          pax_format;         // see below Dxt1,2,3 etc
 byteBool       littleEndian;       // Always true;
 byte           isPaa; 	     //file was a .paa not .pac
 Asciiz         PaaFile[];          // Relative to the file location of the texheader itself.
                                    //"data\icons\m4a3_cco_ca.paa"
                                    //"fnfal\data\fnfal_smdi.paa"
 ulong          pax_suffix_type;    // _co, _ca, smdi, etc
 ulong          nMipmapsCopy;       // same as nMipmaps above
 MipMap         MipMaps[nMipmaps];  // see below
 ulong          SizeOfPaxFile;      //
};

===pax_format===(not all values found in a pax file)

0 Index Pallet (P8),

Greyscale (AI88),
RGB565,
ARGB1555,
ARGB4444,
ARGB8888,
DXT1
DXT2
DXT3,
DXT4,
DXT5

The same value is also repeated in each mipmap

===pax_suffix_type=== (not all values found in a pax file)

0 diffuse color, SRGB color space. the default for anything else

diffuse color, linear color space: (_sky, _lco)
detail texture, linear color space:(_detail,_cdt,_dt,_mco)
normal map: (_nXXX)
irradiance map
Map with random values from interval <0.5, 1>
tree crown calculation texture
'macro' object color, SRGB color space: (_mc)
ambient shadow layer: (_as)
Specular: amount of layer: (_sm, _smdi)
dithering: texture
detail specular: (_dtsmdi) amount of layer
mask: (_mask) used for texture selection in the multi-shader
Thermal Image: (_ti_ca) texture

Color float

anyfloat= anybyte/255.0;

note the order of floats is reverse to the rgba equivalent

mipmap

MipMap
{
 ushort width,height;            //as per same mipmap in the pax
 ushort Always0;
 byte   pax_format;              //same value as above
 byte   Always3;
 ulong  dataOffset;              //OFFSTAGG in PAx file. position of mipmap data in pax file
};