DXGKDDI_VIDPNTOPOLOGY_ACQUIREFIRSTPATHINFO callback function (d3dkmddi.h)
The pfnAcquireFirstPathInfo structure returns a descriptor of the first path in a specified VidPN topology object.
Syntax
DXGKDDI_VIDPNTOPOLOGY_ACQUIREFIRSTPATHINFO DxgkddiVidpntopologyAcquirefirstpathinfo;
NTSTATUS DxgkddiVidpntopologyAcquirefirstpathinfo(
[in] IN_CONST_D3DKMDT_HVIDPNTOPOLOGY hVidPnTopology,
[out] DEREF_OUT_CONST_PPD3DKMDT_VIDPN_PRESENT_PATH ppFirstVidPnPresentPathInfo
)
{...}
Parameters
[in] hVidPnTopology
A handle to a VidPN topology object. The display miniport driver previously obtained this handle by calling the pfnGetTopology function of the DXGK_VIDPN_INTERFACE interface.
[out] ppFirstVidPnPresentPathInfo
A pointer to a variable that receives a pointer to a D3DKMDT_VIDPN_PRESENT_PATH structure. The structure contains a variety of information about the path, including the path's source and target identifiers.
Return value
The pfnAcquireFirstPathInfo function returns one of the following values:
| Return code | Description |
|---|---|
| STATUS_SUCCESS | The function succeeded. |
| STATUS_GRAPHICS_INVALID_VIDPN_TOPOLOGY | The handle supplied in hVidPnTopology was invalid. |
Remarks
When you have finished using the D3DKMDT_VIDPN_PRESENT_PATH structure, you must release the structure by calling pfnReleasePathInfo.
You can enumerate all the paths that belong to a VidPN topology object by calling pfnAcquireFirstPathInfo and then making a sequence of calls to pfnAcquireNextPathInfo.
The D3DKMDT_HVIDPNTOPOLOGY data type is defined in D3dkmdt.h.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista |
| Target Platform | Desktop |
| Header | d3dkmddi.h (include D3dkmddi.h) |
| IRQL | PASSIVE_LEVEL |