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QueryBegin routine

The QueryBegin function marks the beginning of a sequence of graphics commands for a query and transitions the query to the "building" state.

Syntax


PFND3D10DDI_QUERYBEGIN QueryBegin;

VOID APIENTRY QueryBegin(
  _In_ D3D10DDI_HDEVICE hDevice,
  _In_ D3D10DDI_HQUERY  hQuery
)
{ ... }

Parameters

hDevice [in]

A handle to the display device (graphics context).

hQuery [in]

A handle to the query object to begin.

Return value

None

The driver can use the pfnSetErrorCb callback function to set an error code. For more information about setting error codes, see the following Remarks section.

Remarks

The driver is not required to support the QueryBegin function for a D3D10DDI_QUERY_EVENT or D3D10DDI_QUERY_TIMESTAMP query operation. Such a query operation has an implied beginning.

The Microsoft Direct3D runtime cannot call QueryBegin on a predicate that is currently bound to the pipeline through a call to the SetPredication function.

The driver should not encounter any error, except for D3DDDIERR_DEVICEREMOVED. Therefore, if the driver passes any error, except for D3DDDIERR_DEVICEREMOVED, in a call to the pfnSetErrorCb function, the Direct3D runtime will determine that the error is critical. Even if the device was removed, the driver is not required to return D3DDDIERR_DEVICEREMOVED; however, if device removal interfered with the operation of QueryBegin (which typically should not happen), the driver can return D3DDDIERR_DEVICEREMOVED.

Requirements

Target platform

Desktop

Version

Available in Windows Vista and later versions of the Windows operating systems.

Header

D3d10umddi.h (include D3d10umddi.h)

See also

D3D10DDI_DEVICEFUNCS
pfnSetErrorCb
QueryEnd
SetPredication

 

 

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