// d3dukmdt.h

typedef struct _DXGK_NATIVE_FENCE_LOG_HEADER {
  union {
    struct {
      UINT32 FirstFreeEntryIndex;
      UINT32 WraparoundCount;
    };
    ULARGE_INTEGER AtomicWraparoundAndEntryIndex;
  };
  DXGK_NATIVE_FENCE_LOG_TYPE Type;
  UINT64                     NumberOfEntries;
  UINT64                     Reserved[2];
} DXGK_NATIVE_FENCE_LOG_HEADER;
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Windows Driver Kit DDI reference (ns-d3dukmdt-dxgk_native_fence_log_header)

Description

The DXGK_NATIVE_FENCE_LOG_HEADER structure contains the header information for the native fence log buffer.

Members

`FirstFreeEntryIndex`

Index of the first free entry in the log. FirstFreeEntryIndex is the same value as the LowPart of AtomicWraparoundAndEntryIndex.

`WraparoundCount`

The number of times the log entries have wrapped around. Same value as the HighPart of AtomicWraparoundAndEntryIndex.

`AtomicWraparoundAndEntryIndex`

A 64-bit integer that contains the FirstFreeEntryIndex in the LowPart and the WraparoundCount in the HighPart.

`Type`

A DXGK_NATIVE_FENCE_LOG_TYPE enumeration that specifies the type of the native fence log entries.

`NumberOfEntries`

Number of DXGK_NATIVE_FENCE_LOG_ENTRY structures in the Entries array of the native fence log buffer.

`Reserved[2]`

Reserved for system use.

Remarks

For more information about native GPU fences and log buffer usage, see Native GPU fence objects.

DXGK_NATIVE_FENCE_LOG_HEADER - NtDoc