// dxva.h

typedef struct _DXVA_ConfigAlphaLoad {
  DXVA_ConfigQueryOrReplyFunc dwFunction;
  DWORD                       dwReservedBits[3];
  BYTE                        bConfigDataType;
} DXVA_ConfigAlphaLoad, *LPDXVA_ConfigAlphaLoad;
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Windows Driver Kit DDI reference (ns-dxva-_dxva_configalphaload)

_DXVA_ConfigAlphaLoad structure

Description

The DXVA_ConfigAlphaLoad structure is sent by the host decoder to the accelerator to set the configuration for alpha-blend, texture-loading operations.

Members

`dwFunction`

Indicates the type of query or response when using probing and locking commands. The most significant 24 bits of dwFunction is the DXVA_ConfigQueryOrReplyFlag variable.

The least significant 4 bits of the DXVA_ConfigQueryOrReplyFlag variable contains status indicators for the query or response being performed.

The least significant 8 bits of dwFunction is the bDXVA_Func variable that, in this case, is equal to 2.

`dwReservedBits`

Reserved bits used for packing and alignment. These bits are zero.

`bConfigDataType`

Specifies the type of alpha-blend data to be used. This member can be set to one of the following values.

Value	Description
0	16-entry AYUV palette with IA44 alpha-blending surface.
1	16-entry AYUV palette with AI44 alpha-blending surface.
2	16-entry AYUV palette with DPXD, Highlight, and DCCMD data.
3	AYUV graphic surface.

The preferred values for an accelerator to support for bConfigDataType are 1 and 3.

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