PFND3DDDI_ISSUEQUERY callback function (d3dumddi.h)
The IssueQuery function processes a query.
Syntax
PFND3DDDI_ISSUEQUERY Pfnd3dddiIssuequery;
HRESULT Pfnd3dddiIssuequery(
HANDLE hDevice,
const D3DDDIARG_ISSUEQUERY *unnamedParam2
)
{...}
Parameters
hDevice
A handle to the display device (graphics context).
unnamedParam2
pData [in]
A pointer to a D3DDDIARG_ISSUEQUERY structure that describes how to process the query.
Return value
IssueQuery returns one of the following values:
| Return code | Description |
|---|---|
| S_OK | The query is successfully processed. |
| E_OUTOFMEMORY | IssueQuery could not allocate the required memory for it to complete. |
Remarks
The user-mode display driver should set a fence value and store the fence value in the driver's private query structure. The user-mode display driver implements the query by using a fence. If the IssueQuery function is called on a query again before a previous query issue completes, the driver should overwrite the fence value and ignore the previous query issue.
If the call to IssueQuery requires the driver to return data, the driver should insert a graphics processing unit (GPU) instruction to write the required data to an allocation. In the call to the GetQueryData function, the driver should typically lock the allocation and return the appropriate data.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows Vista and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | d3dumddi.h (include D3dumddi.h) |