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Windows Driver Kit DDI reference (nc-d3dhal-lpd3dhal_contextcreatecb)

LPD3DHAL_CONTEXTCREATECB callback function

Description

The D3dContextCreate function creates a context.

Parameters

`unnamedParam1`

pccd [in]

Points to a D3DHAL_CONTEXTCREATEDATA structure that contains the information required to create a context and the data that the driver should store in the new context.

Return value

D3dContextCreate returns one of the following callback codes:

Remarks

D3dContextCreate must be implemented in drivers that support Microsoft Direct3D. It should perform the following steps:

Initialize the driver's context with all information required by the driver to perform rendering. This includes associating the rendering target and depth buffer that the lpDDSLcl and lpDDSZLcl members of the D3DHAL_CONTEXTCREATEDATA structure at pccd point to, respectively, with the context.
Generate a unique context ID for this new context and return it in the dwhContext member of D3DHAL_CONTEXTCREATEDATA. Direct3D uses this context ID in every subsequent callback it makes to this Direct3D device. The driver must never create a context handle of zero.
Set the ddrval member of D3DHAL_CONTEXTCREATEDATA to DD_OK upon success, and to D3DHAL_OUTOFCONTEXTS if it cannot create the context.
Return DDHAL_DRIVER_HANDLED.

D3dContextCreate should not cache the pointer to the DD_DIRECTDRAW_LOCAL structure that was passed in as the lpDDLcl member of D3DHAL_CONTEXTCREATEDATA. If the driver subsequently requires any information that is accessed through this DD_DIRECTDRAW_LOCAL pointer, the driver should store the information in the driver's private context data structure.

State is not shared between contexts; therefore, the driver must maintain full state information for each context. This state is changed by any subsequent calls to D3dDrawPrimitives2.

The driver must be able to reference all texture handles that are created within a context. The driver can then clean up all driver-specific data related to textures created within this context when a D3dContextDestroy call is made.

D3dContextCreate can be called with a disabled PDEV. A PDEV is disabled or enabled by calling the display driver's DrvAssertMode function. See Managing PDEVs for more information.

LPD3DHAL_CONTEXTCREATECB - NtDoc