D3DKMTGetSharedPrimaryHandle function (d3dkmthk.h)

The D3DKMTGetSharedPrimaryHandle function retrieves the global shared handle for the primary surface.

Syntax

NTSTATUS D3DKMTGetSharedPrimaryHandle(
  D3DKMT_GETSHAREDPRIMARYHANDLE *unnamedParam1
);

Parameters

unnamedParam1

pData [in, out]

A pointer to a D3DKMT_GETSHAREDPRIMARYHANDLE structure that describes the parameters that are required to retrieve the shared handle.

Return value

D3DKMTGetSharedPrimaryHandle returns one of the following values:

This function might also return other NTSTATUS values.

Remarks

The primary surface is typically created by the Microsoft DirectX graphics kernel subsystem (Dxgkrnl.sys) every time the display mode changes (although, in some situations, the shared primary might not exist). If an OpenGL application attempts to create a primary surface, it typically must open the existing shared primary. To open the shared primary, the OpenGL application must use D3DKMTGetSharedPrimaryHandle to retrieve the global shared handle for the primary surface.

Example

The following code example demonstrates how an OpenGL ICD can use D3DKMTGetSharedPrimaryHandle to create a primary surface by opening the shared handle.

HRESULT OpenSharedPrimarySurface(D3DKMT_HANDLE hAdapter,
                                 D3DDDI_VIDEO_PRESENT_SOURCE_ID VidPnSourceId,
                                 D3DKMT_HANDLE hDevice, 
                                 VOID* pPrivateDriverData,
                                 UINT PrivateDriverDataSize,
                                 D3DKMT_HANDLE* phResource,
                                 D3DKMT_HANDLE* phAllocation)
{
    D3DKMT_CREATEALLOCATION CreateAllocation;
    D3DDDI_ALLOCATIONINFO AllocationInfo;
    D3DKMT_GETSHAREDPRIMARYHANDLE GetHandleData;

    *phResource = 0;
    *phAllocation = 0;

    // Get the shared handle.
    GetHandleData.hAdapter = hAdapter;
    GetHandleData.VidPnSourceId = VidPnSourceId;

    if (!NT_SUCCESS((*pfnKTGetSharedPrimaryHandle)(&GetHandleData))) {
        return E_FAIL;
    }

    // Was a shared primary created by the kernel?
    if (GetHandleData.hSharedPrimary == NULL) {
        return E_FAIL;
    }

    CreateAllocation.hDevice = hDevice;
    CreateAllocation.hResource = NULL;
    CreateAllocation.hGlobalShare = GetHandleData.hSharedPrimary;
    CreateAllocation.Flags.CreateResource = 
    CreateAllocation.Flags.CreateShared = TRUE;
    CreateAllocation.pPrivateRuntimeData = NULL;
    CreateAllocation.PrivateRuntimeDataSize = 0;
    CreateAllocation.pPrivateDriverData = NULL;
    CreateAllocation.PrivateDriverDataSize = 0;
    CreateAllocation.NumAllocations = 1;
    CreateAllocation.pAllocationInfo = &AllocationInfo;

    AllocationInfo.hAllocation = NULL;
    AllocationInfo.pSystemMem = NULL;
    AllocationInfo.pPrivateDriverData = pPrivateData;
    AllocationInfo.PrivateDriverDataSize = PrivateDataSize;

    if (NT_SUCCESS((*pfnKTCreateAllocation)(&CreateAllocation))) {
        *phResource = CreateAllocation.hResource;
        *phAllocation = AllocationInfo.hAllocation;
        return S_OK;
    }
    return E_FAIL;
}

Requirements

See also

D3DKMT_GETSHAREDPRIMARYHANDLE