VIDEO_PORT_AGP_INTERFACE_2 structure (video.h)
The VIDEO_PORT_AGP_INTERFACE_2 structure describes the AGP service routines provided by the video port driver.
Syntax
typedef struct _VIDEO_PORT_AGP_INTERFACE_2 {
IN USHORT Size;
IN USHORT Version;
OUT PVOID Context;
OUT PINTERFACE_REFERENCE InterfaceReference;
OUT PINTERFACE_DEREFERENCE InterfaceDereference;
OUT PAGP_RESERVE_PHYSICAL AgpReservePhysical;
OUT PAGP_RELEASE_PHYSICAL AgpReleasePhysical;
OUT PAGP_COMMIT_PHYSICAL AgpCommitPhysical;
OUT PAGP_FREE_PHYSICAL AgpFreePhysical;
OUT PAGP_RESERVE_VIRTUAL AgpReserveVirtual;
OUT PAGP_RELEASE_VIRTUAL AgpReleaseVirtual;
OUT PAGP_COMMIT_VIRTUAL AgpCommitVirtual;
OUT PAGP_FREE_VIRTUAL AgpFreeVirtual;
OUT ULONGLONG AgpAllocationLimit;
OUT PAGP_SET_RATE AgpSetRate;
} VIDEO_PORT_AGP_INTERFACE_2, *PVIDEO_PORT_AGP_INTERFACE_2;
Members
Size
Specifies the size in bytes of this structure.
Version
Specifies the version of the interface to be returned by the video port driver. The current interface version is defined in video.h and has the form VIDEO_PORT_AGP_INTERFACE_N.
Context
Pointer to a video port driver-defined context for the interface.
InterfaceReference
Pointer to the video port driver-implemented reference routine for this interface.
InterfaceDereference
Pointer to the video port driver-implemented dereference routine for this interface.
AgpReservePhysical
Pointer to the video port driver-implemented AgpReservePhysical routine.
AgpReleasePhysical
Pointer to the video port driver-implemented AgpReleasePhysical routine.
AgpCommitPhysical
Pointer to the video port driver-implemented AgpCommitPhysical routine.
AgpFreePhysical
Pointer to the video port driver-implemented AgpFreePhysical routine.
AgpReserveVirtual
Pointer to the video port driver-implemented AgpReserveVirtual routine.
AgpReleaseVirtual
Pointer to the video port driver-implemented AgpReleaseVirtual routine.
AgpCommitVirtual
Pointer to the video port driver-implemented AgpCommitVirtual routine.
AgpFreeVirtual
Pointer to the video port driver-implemented AgpFreeVirtual routine.
AgpAllocationLimit
Specifies the maximum total number of bytes of AGP memory that a miniport driver can commit.
AgpSetRate
Pointer to the video port driver-implemented AgpSetRate routine.
Remarks
PnP video miniport drivers that can use AGP must fill in the Size and Version members, and then call the VideoPortQueryServices function, which initializes the remaining members of this structure.
This structure is identical to the VIDEO_PORT_AGP_INTERFACE structure, except for the AgpSetRate member, which that structure lacks. Video miniport drivers should first attempt to use VIDEO_PORT_AGP_INTERFACE_2 in a call to VideoPortQueryServices. If that call fails, due to the fact that the AGP filter driver does not support the newer version of the AGP interface, the video miniport driver can make a second call to VideoPortQueryServices, this time passing a VIDEO_PORT_AGP_INTERFACE structure.
Requirements
| Requirement | Value |
|---|---|
| Header | video.h (include Video.h) |