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bmt2xml

A while ago someone asked about reading bml and bmt files, some form of binary XML files used by Need for Speed: Shift for material information and probably other things as well.

File Format

• BLMY
  • 4 bytes: name (BLMY)
  • 4 bytes integer: 7 (Number of entries in block list?)
  • 4 bytes integer: total file size
  • 4 bytes integer: ??? (Always 0)
• Blocks List
  • 4 bytes: name (HEAD/ELMT/ATTR/COLL/NUMB/BOOL/STRS)
  • 4 bytes integer: Data length in bytes
  • 4 bytes integer: Data start offset in file
  • 4 bytes integer: ??? (Always 0)
  • ...
• HEAD Data
  • 4 bytes integer: Number of Elements
  • 4 bytes integer: Number of Attributes
  • 4 bytes integer: Number of COLL
  • 4 bytes integer: Number of Numbers
  • 4 bytes integer: Number of Strings
  • 4 bytes integer: Number of Booleans
  • 4 bytes integer: ??? (Seems to always be number of elements-1; Number of child elements? Could also be index of the root-element)
• ELMT Data
  • 4 bytes integer: Name (Resource ID or hash?)
  • 4 bytes integer: First attribute (attribute number)
  • 4 bytes integer: Number of attributes
  • 4 bytes integer: Number of child elements
  • 4 bytes integer: First child element (element number)
  • 4 bytes integer: Next sibling (element number)
  • 4 bytes integer: Number element of same type (element number)
  • ...
• ATTR Data
  • 4 bytes integer: Name (Resource ID or hash?)
  • 4 bytes integer: type (0=numb, 1=bool, 2=strs)
  • 4 bytes integer: value (offset or index)
  • 4 bytes integer: Number of values
  • 4 bytes integer: Next attribute of the same kind (attribute number)
  • ...
• COLL Data
  • 4 bytes integer: Name (Resource ID or hash?)
  • 4 bytes integer: ?
    (if Name is same as of root element this seems to be same as the number of child elements)
  • 4 bytes integer: ? (1 or 0)
  • 4 bytes integer: ? (Always -1)
  • ...
• NUMB Data
  • float array
• BOOL Data
  • Bit field
• STRS Data
  • Strings

bmt2xml tool

Building bmt2xml

            # git clone http://git.pappkartong.se/bmt2xml.git
            # cd bmt2xml
            # make
        

Using bmt2xml

# ./bmt2xml file.bmt

Example:

# ./bmt2xml autograss_laguna.bmt 
<material name="Autograss" shader="Render\Shaders\grass_billboard.fx" technique="Grass" cull="EBFCT_NONE" fog="false" antialias="1" numparams="10">
  <shaderparam name="fadeDistances" type="EPT_VEC2">
    <value v="0 100" />
  </shaderparam>
  <shaderparam name="cornerHeights" type="EPT_VEC4">
    <value v="0 0 0 0" />
  </shaderparam>
  <shaderparam name="subPageWidths" type="EPT_VEC4">
    <value v="1 0.9 0.9 0.9" />
  </shaderparam>
  <shaderparam name="subPageHeights" type="EPT_VEC4">
    <value v="0.28 0.25 0.23 0.23" />
  </shaderparam>
  <shaderparam name="boxWorldCoordsSize" type="EPT_F32">
    <value v="16" />
  </shaderparam>
  <shaderparam name="diffuseTexture" type="EPT_TEXTURE">
    <type t="ET_STANDARD" />
    <value v="Effects\Particles\Textures\Autograss_Laguna.dds" />
  </shaderparam>
  <shaderparam name="maxAnimatedVertDisplacement" type="EPT_F32">
    <value v="0.25" />
  </shaderparam>
  <shaderparam name="transmissiveMult" type="EPT_VEC4">
    <value v="0.8 1 0.2 1" />
  </shaderparam>
  <depthparams>
    <enabled e="true" />
    <writeenabled w="true" />
  </depthparams>
  <alphatestparams>
    <enabled e="true" />
    <value v="128" />
    <function f="ETF_GREATER_THAN_OR_EQUAL" />
  </alphatestparams>
  <alphablendparams>
    <enabled e="false" />
  </alphablendparams>
  <define name="AUTOGRASS" />
</material>
        

TODO

• Figure out what COLL is
• Cleanup
• Add command line options for outfile etc.

Download

The source code for bmt2xml.

Clone the git repository

git: # git clone http://git.pappkartong.se/bmt2xml.git

Note: This is a git repository, you need git to use it.

Download using gitweb

Or download the current head bmt2xml-master-*.tar.gz using gitweb.