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NC:d3dkmddi.DXGKDDI_VIDPNTOPOLOGY_ACQUIREPATHINFO |
DXGKDDI_VIDPNTOPOLOGY_ACQUIREPATHINFO (d3dkmddi.h) |
The pfnAcquirePathInfo function returns a descriptor of the video present path specified by a video present source and a video present target within a particular VidPN topology. |
display\dxgk_vidpntopology_interface_pfnacquirepathinfo.htm |
05/10/2018 |
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DXGKDDI_VIDPNTOPOLOGY_ACQUIREPATHINFO, DXGKDDI_VIDPNTOPOLOGY_ACQUIREPATHINFO callback, VidPnFunctions_fb690a8a-fc98-4f8f-bfe5-14168a5fdb6a.xml, d3dkmddi/pfnAcquirePathInfo, display.dxgk_vidpntopology_interface_pfnacquirepathinfo, pfnAcquirePathInfo, pfnAcquirePathInfo callback function [Display Devices] |
d3dkmddi.h |
D3dkmddi.h |
Desktop |
Windows Vista |
PASSIVE_LEVEL |
Windows |
display |
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The pfnAcquirePathInfo function returns a descriptor of the video present path specified by a video present source and a video present target within a particular VidPN topology.
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.
An integer that identifies a video present source.
An integer that identifies a video present target.
A pointer to a variable that receives a pointer to a D3DKMDT_VIDPN_PRESENT_PATH structure that describes the requested path.
The pfnAcquirePathInfo 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. |
When you have finished using the D3DKMDT_VIDPN_PRESENT_PATH structure, you must release the structure by calling pfnReleasePathInfo.
A path contains a (source, target) pair, and a topology is a collection of paths. This function returns a descriptor for the path, in a specified topology, that contains a specified (source, target) pair.
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.
VidPN source identifiers are assigned by the operating system. DxgkDdiStartDevice, implemented by the display miniport driver, returns the number N of video present sources supported by the display adapter. Then the operating system assigns identifiers 0, 1, 2, ... N - 1.
VidPN target identifiers are assigned by the display miniport driver. DxgkDdiQueryChildRelations, implemented by the display miniport driver, returns an array of DXGK_CHILD_DESCRIPTOR structures, each of which contains an identifier.
The D3DKMDT_HVIDPNTOPOLOGY data type is defined in D3dkmdt.h.
The D3DDDI_VIDEO_PRESENT_SOURCE_ID and D3DDDI_VIDEO_PRESENT_TARGET_ID data types are defined in D3dukmdt.h.