VTFX file format

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VTFx is a file format used by Valve to store textures on the Xbox 360. It has a different header from normal VTF files and stores it's data in a compressed DirectDraw Surface. Conversion or reading from a VTFX file is not possible at this time. Compression seems to be varied depending on what game is using the vtfx

VTFX file format

VTFX layout

(estimated based on VTF)

VTFX Header
VTFX Low Resolution Image Data
For Each Mipmap (Smallest to Largest)
  For Each Frame (First to Last)
    For Each Face (First to Last)
      For Each Z Slice (Min to Max; Varies with Mipmap)
        VTFX High Resolution Image Data

VTFX header

typedef struct tagVTFXHEADER  
{
	char fileTypeString[4];         // VTFX.
	int version[2]; 		// version[0].version[1].
	int headerSize;
	unsigned int	flags;
	unsigned short	width;					// actual width of data in file.
	unsigned short	height;					// actual height of data in file.
	unsigned short	depth;					// actual depth of data in file.
	unsigned short	numFrames;
	unsigned short	preloadDataSize;		// exact size of preload data (may extend into image!).
	unsigned char	mipSkipCount;			// used to resconstruct mapping dimensions.
	unsigned char	numResources;
	Vector			reflectivity;			// Resides on 16 byte boundary!.
	float			bumpScale;
	ImageFormat		imageFormat;
	unsigned char	lowResImageSample[4];
	unsigned int	compressedSize;

	// *** followed by *** ResourceEntryInfo resources[0];
} VTFXHEADER;
#define VTF_X360_MAJOR_VERSION	0x0360
#define VTF_X360_MINOR_VERSION	8