VTable

VTable Description

• At its simplest, a VTable is an array of pointers to functions. VTables are sometimes referred to as VFTables (or Virtual Function Tables) or VMTs (Virtual Method Tables). Any class/struct object with virtual methods contains an internal pointer to a VTable. The VTable layout is implementation dependent, and may frequently contain type metadata (to support DynamicCast) and correction factors needed to support MultipleInheritance.

GTA:IV's resource data files often contain structures that are a direct memory dump of a complete class/structure in memory. These classes are sometimes virtual classes and often contain a VTable pointer in them. When the data is loaded into memory, the data is relocated and VTable pointer is corrected to the proper one by the game. It is important to note that the VTable pointer value will change depending on the exact build/version of the resource compiler used. They are a helpful indicator to identify data structures in files. However, that's all they are -- indicators.

Documentation

Possible values of a VTable

Name	Decimal	Hex	Description
DrawableModel	6902356	0x54526900	WDR Header
DrawableDictionary	6902692	0xA4536900	WDD Header
Geometry	7031028	0xF4486B00	Start of Geometry
VertexBuffer	7060184	0xD8BA6B00	Start of VertexBuffer
IndexBuffer	7059568	0x70B86B00	Start of IndexBuffer
ShaderGroup	7018052	0x44166B00	Start of ShaderGroup
Shader	7021116	0x3C226B00	Start of Shader
Boundries	6902624	0x60536900	WBD Header
TextureDictionary	6949024	0xA0086A00	WTD Header

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