D3D10DDI_VERTEX_CACHE_DESC structure (d3d10umddi.h)

The D3D10DDI_VERTEX_CACHE_DESC structure describes mesh-optimization data.

Syntax

typedef struct D3D10DDI_VERTEX_CACHE_DESC {
  [out] UINT Pattern;
  [out] UINT OptMethod;
  [out] UINT CacheSize;
  [out] UINT MagicNumber;
} D3D10DDI_VERTEX_CACHE_DESC;

Members

[out] Pattern

The bit pattern. The driver must specify the bit pattern as a CACH four-character code (FOURCC) value. The driver can use the following MAKEFOURCC macro to specify the FOURCC value as CACH:

MAKEFOURCC('C', 'A', 'C', 'H'); 

[out] OptMethod

The method of mesh optimization. The driver can use one of the following values to specify the mesh optimization that it uses.

Value	Meaning
0	Longest strips optimization
1	Vertex-cache-based optimization

[out] CacheSize

The effective size, in entries, that the driver optimizes the vertex cache for. The actual cache size is not required to be the size that is specified in CacheSize because the actual cache size is larger in most situations. The driver specifies an optimized size in CacheSize only if it also specifies 1 in the OptMethod member.

[out] MagicNumber

The number that should be used as part of a trial-and-error procedure when you are determining when to restart the strips list. This number can be from 1 through the value that is specified in the CacheSize member. Typically, the best values are near CacheSize/2. The driver specifies a number in MagicNumber only if it also specifies 0 in the OptMethod member.

Requirements

Requirement	Value
Minimum supported client	Available in Windows Vista and later versions of the Windows operating systems.
Header	d3d10umddi.h (include D3d10umddi.h)